Built 2026-10-15 (15 October 2026)

Fond du Lac Wwtp Weather Records (USC00472839)

Record envelope, standing records and threshold days for Fond du Lac Wwtp (USC00472839), Wisconsin, United States, with 134 years of record.

Key Facts for Fond du Lac Wwtp

  • Fond du Lac Wwtp (USC00472839) is a weather station in Wisconsin, United States at 43.80 latitude and -88.45 longitude, 229 m (750 ft) above sea level.
  • The station reports from 1893 to 2026, 134 years of record.
  • 1,464 records set at Fond du Lac Wwtp still stand.
  • Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Fond du Lac Wwtp set a daily record precipitation of 32.0 mm (1.3 in) on 2 July 2026.

About the Station

  • Location: Wisconsin, United States, 43.80 latitude, -88.45 longitude.
  • Elevation: 229 m (750 ft).
  • Period of record: 1893 to 2026, 134 years.
  • Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

3 days at or beyond a record
Daily record high and record low at Fond du Lac Wwtp, with 2026 drawn through them The band shows the record high and record low for each calendar day at Fond du Lac Wwtp. The lines show the 2026 daily maximum and minimum. 3 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -60-40-200204060 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Fond du Lac Wwtp. The lines show the 2026 daily maximum and minimum. 3 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Fond du Lac Wwtp, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan13.9 C (57.0 F)-40.6 C (-41.1 F)12.8 C (55.0 F)-28.3 C (-18.9 F)
Feb22.8 C (73.0 F)-35.0 C (-31.0 F)14.4 C (57.9 F)-18.3 C (-0.9 F)
Mar28.3 C (82.9 F)-31.1 C (-24.0 F)21.1 C (70.0 F)-15.6 C (3.9 F)
Apr32.2 C (90.0 F)-16.1 C (3.0 F)26.1 C (79.0 F)-5.6 C (21.9 F)
May40.6 C (105.1 F)-6.1 C (21.0 F)31.7 C (89.1 F)-1.7 C (28.9 F)
Jun40.0 C (104.0 F)-1.7 C (28.9 F)33.3 C (91.9 F)10.0 C (50.0 F)
Jul43.9 C (111.0 F)3.3 C (37.9 F)35.6 C (96.1 F)11.1 C (52.0 F)
Aug39.4 C (102.9 F)0.6 C (33.1 F)28.9 C (84.0 F)10.0 C (50.0 F)
Sep38.3 C (100.9 F)-5.6 C (21.9 F)32.2 C (90.0 F)7.8 C (46.0 F)
Oct32.2 C (90.0 F)-15.0 C (5.0 F)23.9 C (75.0 F)6.1 C (43.0 F)
Nov27.2 C (81.0 F)-23.3 C (-9.9 F)n/an/a
Dec18.3 C (64.9 F)-33.3 C (-27.9 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Fond du Lac Wwtp by the year they were set 1,464 records at Fond du Lac Wwtp still stand. 1931 holds the most, with 35. 0102030401893: 151894: 151895: 271896: 91897: 201898: 81899: 191900: 71901: 71902: 91903: 71904: 141905: 121906: 91907: 101908: 111909: 201910: 201911: 181912: 141913: 141914: 161915: 201916: 171917: 181918: 141919: 61920: 81921: 111922: 51923: 131924: 61925: 131926: 71927: 101928: 141929: 131930: 241931: 351932: 171933: 151934: 261935: 81936: 281937: 111938: 71939: 191940: 81941: 91942: 151943: 81944: 111945: 131946: 131947: 231948: 91949: 61950: 161951: 191952: 151953: 151954: 81955: 61956: 101957: 61958: 81959: 181960: 61961: 41962: 91963: 51964: 141965: 151966: 61967: 101968: 81969: 71970: 51971: 121972: 131973: 111974: 81975: 81976: 61977: 151978: 41979: 141980: 41981: 71982: 111983: 151984: 81985: 91986: 71987: 71988: 121989: 101990: 111991: 131992: 71993: 41994: 121995: 91996: 91997: 41998: 111999: 62000: 112001: 102002: 92003: 42004: 52005: 62006: 52007: 62008: 42009: 62010: 52011: 62012: 162013: 52014: 142015: 102016: 52017: 62018: 92019: 112020: 72021: 82022: 42023: 72024: 102025: 132026: 41893190719211935194919631977199120052019
1,464 records at Fond du Lac Wwtp still stand. 1931 holds the most, with 35.
Standing records at Fond du Lac Wwtp by the year they were set
Year setStanding records
189315
189415
189527
18969
189720
18988
189919
19007
19017
19029
19037
190414
190512
19069
190710
190811
190920
191020
191118
191214
191314
191416
191520
191617
191718
191814
19196
19208
192111
19225
192313
19246
192513
19267
192710
192814
192913
193024
193135
193217
193315
193426
19358
193628
193711
19387
193919
19408
19419
194215
19438
194411
194513
194613
194723
19489
19496
195016
195119
195215
195315
19548
19556
195610
19576
19588
195918
19606
19614
19629
19635
196414
196515
19666
196710
19688
19697
19705
197112
197213
197311
19748
19758
19766
197715
19784
197914
19804
19817
198211
198315
19848
19859
19867
19877
198812
198910
199011
199113
19927
19934
199412
19959
19969
19974
199811
19996
200011
200110
20029
20034
20045
20056
20065
20076
20084
20096
20105
20116
201216
20135
201414
201510
20165
20176
20189
201911
20207
20218
20224
20237
202410
202513
20264

All-Time Record Progression

13 new records
When Fond du Lac Wwtp set new all-time records 13 all-time records were set at Fond du Lac Wwtp between 4 August 1924 and 13 July 1995. Each dot is a new record. Record daily precipitationRecord high minimum temperatureRecord high maximum temperatureRecord low minimum temperatureRecord low maximum temperatureRecord daily snowfall4 August 1924: Record daily precipitation 134.6 mm (5.3 in)30 June 1931: Record high minimum temperature 25.6 C (78.1 F)23 July 1934: Record high maximum temperature 41.7 C (107.1 F)7 July 1936: Record high maximum temperature 42.2 C (108.0 F)12 July 1936: Record high maximum temperature 42.8 C (109.0 F)13 July 1936: Record high maximum temperature 43.9 C (111.0 F)30 January 1951: Record low minimum temperature -40.6 C (-41.1 F)15 January 1972: Record low maximum temperature -27.2 C (-17.0 F)18 August 1978: Record daily precipitation 145.8 mm (5.7 in)10 September 1986: Record daily precipitation 173.5 mm (6.8 in)2 August 1988: Record high minimum temperature 26.7 C (80.1 F)3 December 1990: Record daily snowfall 35.6 cm (14.0 in)13 July 1995: Record high minimum temperature 27.2 C (81.0 F)1930194019501960197019801990
13 all-time records were set at Fond du Lac Wwtp between 4 August 1924 and 13 July 1995. Each dot is a new record.
When Fond du Lac Wwtp set new all-time records
DateKindDetail
1924-08-04Record daily precipitationRecord daily precipitation 134.6 mm (5.3 in)
1931-06-30Record high minimum temperatureRecord high minimum temperature 25.6 C (78.1 F)
1934-07-23Record high maximum temperatureRecord high maximum temperature 41.7 C (107.1 F)
1936-07-07Record high maximum temperatureRecord high maximum temperature 42.2 C (108.0 F)
1936-07-12Record high maximum temperatureRecord high maximum temperature 42.8 C (109.0 F)
1936-07-13Record high maximum temperatureRecord high maximum temperature 43.9 C (111.0 F)
1951-01-30Record low minimum temperatureRecord low minimum temperature -40.6 C (-41.1 F)
1972-01-15Record low maximum temperatureRecord low maximum temperature -27.2 C (-17.0 F)
1978-08-18Record daily precipitationRecord daily precipitation 145.8 mm (5.7 in)
1986-09-10Record daily precipitationRecord daily precipitation 173.5 mm (6.8 in)
1988-08-02Record high minimum temperatureRecord high minimum temperature 26.7 C (80.1 F)
1990-12-03Record daily snowfallRecord daily snowfall 35.6 cm (14.0 in)
1995-07-13Record high minimum temperatureRecord high minimum temperature 27.2 C (81.0 F)

Wettest Day of Each Month

Sep: 173.5 mm (6.8 in)
Record daily precipitation for each month at Fond du Lac Wwtp The wettest day on record for each calendar month at Fond du Lac Wwtp. The most was 173.5 mm (6.8 in) on 10 September 1986. 050100150200 Jan: 71.9 mm (2.8 in), 4 January 1982 Jan Feb: 41.9 mm (1.6 in), 1 February 1915 Feb Mar: 88.9 mm (3.5 in), 12 March 1923 Mar Apr: 60.5 mm (2.4 in), 3 April 1999 Apr May: 96.8 mm (3.8 in), 30 May 1989 May Jun: 103.4 mm (4.1 in), 12 June 2008 Jun Jul: 93.2 mm (3.7 in), 18 July 1952 Jul Aug: 145.8 mm (5.7 in), 18 August 1978 Aug Sep: 173.5 mm (6.8 in), 10 September 1986 Sep Oct: 94.0 mm (3.7 in), 24 October 1991 Oct Nov: 50.5 mm (2.0 in), 21 November 1906 Nov Dec: 52.6 mm (2.1 in), 30 December 1971 Dec
The wettest day on record for each calendar month at Fond du Lac Wwtp. The most was 173.5 mm (6.8 in) on 10 September 1986.
Record daily precipitation for each month at Fond du Lac Wwtp
MonthRecord daily precipitation (mm)Date
Jan71.9 mm (2.8 in)4 January 1982
Feb41.9 mm (1.6 in)1 February 1915
Mar88.9 mm (3.5 in)12 March 1923
Apr60.5 mm (2.4 in)3 April 1999
May96.8 mm (3.8 in)30 May 1989
Jun103.4 mm (4.1 in)12 June 2008
Jul93.2 mm (3.7 in)18 July 1952
Aug145.8 mm (5.7 in)18 August 1978
Sep173.5 mm (6.8 in)10 September 1986
Oct94.0 mm (3.7 in)24 October 1991
Nov50.5 mm (2.0 in)21 November 1906
Dec52.6 mm (2.1 in)30 December 1971

Period of Record Coverage

1893 to 2026
Days with data per year at Fond du Lac Wwtp 134 years of record at Fond du Lac Wwtp, 1893 to 2026. 9 years have data for under 90 percent of days and are left out of rankings: 1895, 1896, 1899, 1901, 1906, 1942, 2000, 2022 and others. 1893: 349 of 365 days1894: 352 of 365 days1895: 326 of 365 days1896: 174 of 366 days1897: 358 of 365 days1898: 336 of 365 days1899: 271 of 365 days1900: 340 of 365 days1901: 299 of 365 days1902: 365 of 365 days1903: 362 of 365 days1904: 364 of 366 days1905: 363 of 365 days1906: 307 of 365 days1907: 360 of 365 days1908: 358 of 366 days1909: 360 of 365 days1910: 365 of 365 days1911: 360 of 365 days1912: 366 of 366 days1913: 362 of 365 days1914: 365 of 365 days1915: 365 of 365 days1916: 366 of 366 days1917: 357 of 365 days1918: 362 of 365 days1919: 365 of 365 days1920: 366 of 366 days1921: 365 of 365 days1922: 364 of 365 days1923: 363 of 365 days1924: 364 of 366 days1925: 364 of 365 days1926: 362 of 365 days1927: 364 of 365 days1928: 364 of 366 days1929: 361 of 365 days1930: 364 of 365 days1931: 362 of 365 days1932: 366 of 366 days1933: 357 of 365 days1934: 361 of 365 days1935: 362 of 365 days1936: 358 of 366 days1937: 362 of 365 days1938: 359 of 365 days1939: 355 of 365 days1940: 362 of 366 days1941: 360 of 365 days1942: 297 of 365 days1943: 362 of 365 days1944: 366 of 366 days1945: 365 of 365 days1946: 364 of 365 days1947: 363 of 365 days1948: 362 of 366 days1949: 361 of 365 days1950: 364 of 365 days1951: 365 of 365 days1952: 364 of 366 days1953: 364 of 365 days1954: 365 of 365 days1955: 364 of 365 days1956: 366 of 366 days1957: 364 of 365 days1958: 365 of 365 days1959: 364 of 365 days1960: 366 of 366 days1961: 365 of 365 days1962: 365 of 365 days1963: 349 of 365 days1964: 365 of 366 days1965: 365 of 365 days1966: 365 of 365 days1967: 365 of 365 days1968: 366 of 366 days1969: 364 of 365 days1970: 365 of 365 days1971: 365 of 365 days1972: 366 of 366 days1973: 365 of 365 days1974: 365 of 365 days1975: 365 of 365 days1976: 366 of 366 days1977: 365 of 365 days1978: 365 of 365 days1979: 365 of 365 days1980: 336 of 366 days1981: 365 of 365 days1982: 364 of 365 days1983: 365 of 365 days1984: 366 of 366 days1985: 364 of 365 days1986: 364 of 365 days1987: 364 of 365 days1988: 365 of 366 days1989: 363 of 365 days1990: 335 of 365 days1991: 361 of 365 days1992: 365 of 366 days1993: 363 of 365 days1994: 364 of 365 days1995: 361 of 365 days1996: 366 of 366 days1997: 364 of 365 days1998: 363 of 365 days1999: 364 of 365 days2000: 303 of 366 days2001: 360 of 365 days2002: 361 of 365 days2003: 357 of 365 days2004: 365 of 366 days2005: 362 of 365 days2006: 362 of 365 days2007: 356 of 365 days2008: 365 of 366 days2009: 363 of 365 days2010: 364 of 365 days2011: 364 of 365 days2012: 366 of 366 days2013: 365 of 365 days2014: 365 of 365 days2015: 365 of 365 days2016: 366 of 366 days2017: 362 of 365 days2018: 360 of 365 days2019: 360 of 365 days2020: 353 of 366 days2021: 331 of 365 days2022: 328 of 365 days2023: 357 of 365 days2024: 357 of 366 days2025: 365 of 365 days2026: 263 of 365 days1900192019401960198020002020
134 years of record at Fond du Lac Wwtp, 1893 to 2026. 9 years have data for under 90 percent of days and are left out of rankings: 1895, 1896, 1899, 1901, 1906, 1942, 2000, 2022 and others.
Days with data per year at Fond du Lac Wwtp
YearDays with dataShare of yearComplete
189334996%Yes
189435296%Yes
189532689%No
189617448%No
189735898%Yes
189833692%Yes
189927174%No
190034093%Yes
190129982%No
1902365100%Yes
190336299%Yes
190436499%Yes
190536399%Yes
190630784%No
190736099%Yes
190835898%Yes
190936099%Yes
1910365100%Yes
191136099%Yes
1912366100%Yes
191336299%Yes
1914365100%Yes
1915365100%Yes
1916366100%Yes
191735798%Yes
191836299%Yes
1919365100%Yes
1920366100%Yes
1921365100%Yes
1922364100%Yes
192336399%Yes
192436499%Yes
1925364100%Yes
192636299%Yes
1927364100%Yes
192836499%Yes
192936199%Yes
1930364100%Yes
193136299%Yes
1932366100%Yes
193335798%Yes
193436199%Yes
193536299%Yes
193635898%Yes
193736299%Yes
193835998%Yes
193935597%Yes
194036299%Yes
194136099%Yes
194229781%No
194336299%Yes
1944366100%Yes
1945365100%Yes
1946364100%Yes
194736399%Yes
194836299%Yes
194936199%Yes
1950364100%Yes
1951365100%Yes
195236499%Yes
1953364100%Yes
1954365100%Yes
1955364100%Yes
1956366100%Yes
1957364100%Yes
1958365100%Yes
1959364100%Yes
1960366100%Yes
1961365100%Yes
1962365100%Yes
196334996%Yes
1964365100%Yes
1965365100%Yes
1966365100%Yes
1967365100%Yes
1968366100%Yes
1969364100%Yes
1970365100%Yes
1971365100%Yes
1972366100%Yes
1973365100%Yes
1974365100%Yes
1975365100%Yes
1976366100%Yes
1977365100%Yes
1978365100%Yes
1979365100%Yes
198033692%Yes
1981365100%Yes
1982364100%Yes
1983365100%Yes
1984366100%Yes
1985364100%Yes
1986364100%Yes
1987364100%Yes
1988365100%Yes
198936399%Yes
199033592%Yes
199136199%Yes
1992365100%Yes
199336399%Yes
1994364100%Yes
199536199%Yes
1996366100%Yes
1997364100%Yes
199836399%Yes
1999364100%Yes
200030383%No
200136099%Yes
200236199%Yes
200335798%Yes
2004365100%Yes
200536299%Yes
200636299%Yes
200735698%Yes
2008365100%Yes
200936399%Yes
2010364100%Yes
2011364100%Yes
2012366100%Yes
2013365100%Yes
2014365100%Yes
2015365100%Yes
2016366100%Yes
201736299%Yes
201836099%Yes
201936099%Yes
202035396%Yes
202133191%Yes
202232890%No
202335798%Yes
202435798%Yes
2025365100%Yes
202626372%No

Latest Records

20
Latest records at Fond du Lac Wwtp
DateStationRecordValueBeat old record byOld record stoodSignificance
2 July 2026Fond du Lac Wwtp, USdaily rain32.0 mm (1.3 in)1.5 mm (0.06 in)92 years38 of 100 (Notable)
1 July 2026Fond du Lac Wwtp, USdaily high min25.6 C (78.1 F)0.6 C (1.1 F)56 years27 of 100 (Routine)
4 April 2026Fond du Lac Wwtp, USdaily rain26.9 mm (1.1 in)1.2 mm (0.05 in)40 years23 of 100 (Routine)
16 March 2026Fond du Lac Wwtp, USdaily snowfall25.4 cm (10.0 in)15.2 cm (6.0 in)100 years69 of 100 (Major)
10 March 2026Fond du Lac Wwtp, USdaily high max21.1 C (70.0 F)2.2 C (4.0 F)131 years43 of 100 (Notable)
7 March 2026Fond du Lac Wwtp, USdaily rain29.0 mm (1.1 in)11.2 mm (0.4 in)101 years55 of 100 (Notable)
17 February 2026Fond du Lac Wwtp, USdaily high max14.4 C (57.9 F)0.5 C (0.9 F)44 years23 of 100 (Routine)
24 January 2026Fond du Lac Wwtp, USdaily low max (Tie)-21.7 C (-7.1 F)tie90 years9 of 100 (Routine)
14 January 2026Fond du Lac Wwtp, USdaily high max10.0 C (50.0 F)3.3 C (5.9 F)98 years44 of 100 (Notable)
14 December 2025Fond du Lac Wwtp, USdaily low max-16.7 C (1.9 F)1.7 C (3.1 F)122 years42 of 100 (Notable)
10 December 2025Fond du Lac Wwtp, USdaily snowfall14.0 cm (5.5 in)1.3 cm (0.5 in)32 years21 of 100 (Routine)
5 December 2025Fond du Lac Wwtp, USdaily low min (Tie)-20.6 C (-5.1 F)tie129 years10 of 100 (Routine)
6 October 2025Fond du Lac Wwtp, USdaily high min18.3 C (64.9 F)1.1 C (2.0 F)62 years30 of 100 (Routine)
5 October 2025Fond du Lac Wwtp, USdaily high min18.3 C (64.9 F)0.5 C (0.9 F)107 years40 of 100 (Notable)
5 October 2025Fond du Lac Wwtp, USdaily high max30.0 C (86.0 F)1.7 C (3.1 F)28 years20 of 100 (Routine)
4 October 2025Fond du Lac Wwtp, USdaily high max30.6 C (87.1 F)0.6 C (1.1 F)58 years27 of 100 (Routine)
6 September 2025Fond du Lac Wwtp, USdaily low max14.4 C (57.9 F)1.2 C (2.2 F)68 years32 of 100 (Routine)
4 September 2025Fond du Lac Wwtp, USdaily low min5.0 C (41.0 F)0.6 C (1.1 F)111 years41 of 100 (Notable)
9 August 2025Fond du Lac Wwtp, USdaily high min (Tie)22.2 C (72.0 F)tie91 years9 of 100 (Routine)
23 June 2025Fond du Lac Wwtp, USdaily high min25.0 C (77.0 F)1.7 C (3.1 F)116 years43 of 100 (Notable)

Climate Trend

118 complete years, 1893 to 2025
Annual mean temperature at Fond du Lac Wwtp as warming stripes, 1893 to 2025 One stripe for each of 118 complete years at Fond du Lac Wwtp, 1893 to 2025. Blue stripes are years cooler than the station's own mean of 7.8 C (46.0 F); red stripes are warmer. The coolest year was 2014, at 5.1 C (41.2 F), and the warmest was 1931, at 11.2 C (52.2 F). The strongest colour marks a difference of 3.5 C (6.3 F). 1893: 5.5 C, -2.3 C from the station mean1894: 8.1 C, +0.3 C from the station mean1897: 7.4 C, -0.4 C from the station mean1902: 8.3 C, +0.5 C from the station mean1903: 7.5 C, -0.3 C from the station mean1904: 6.0 C, -1.8 C from the station mean1905: 6.6 C, -1.2 C from the station mean1907: 6.8 C, -1.0 C from the station mean1908: 8.1 C, +0.3 C from the station mean1909: 7.1 C, -0.7 C from the station mean1910: 7.3 C, -0.4 C from the station mean1911: 8.1 C, +0.3 C from the station mean1912: 6.4 C, -1.3 C from the station mean1913: 8.0 C, +0.2 C from the station mean1914: 7.6 C, -0.2 C from the station mean1915: 7.4 C, -0.3 C from the station mean1916: 7.1 C, -0.7 C from the station mean1917: 5.4 C, -2.3 C from the station mean1918: 7.9 C, +0.1 C from the station mean1919: 8.3 C, +0.5 C from the station mean1920: 7.2 C, -0.6 C from the station mean1921: 9.7 C, +1.9 C from the station mean1922: 8.6 C, +0.8 C from the station mean1923: 8.0 C, +0.3 C from the station mean1924: 6.2 C, -1.5 C from the station mean1925: 7.7 C, -0.1 C from the station mean1926: 7.4 C, -0.4 C from the station mean1927: 8.7 C, +0.9 C from the station mean1928: 8.8 C, +1.0 C from the station mean1929: 7.5 C, -0.3 C from the station mean1930: 9.3 C, +1.5 C from the station mean1931: 11.2 C, +3.5 C from the station mean1932: 9.0 C, +1.3 C from the station mean1933: 9.4 C, +1.6 C from the station mean1934: 9.6 C, +1.8 C from the station mean1935: 8.3 C, +0.6 C from the station mean1936: 8.0 C, +0.2 C from the station mean1937: 8.3 C, +0.5 C from the station mean1938: 9.6 C, +1.8 C from the station mean1939: 9.7 C, +1.9 C from the station mean1940: 7.7 C, -0.1 C from the station mean1941: 9.2 C, +1.4 C from the station mean1943: 7.1 C, -0.6 C from the station mean1944: 8.2 C, +0.5 C from the station mean1945: 7.1 C, -0.7 C from the station mean1946: 8.4 C, +0.7 C from the station mean1947: 7.8 C, 0.0 C from the station mean1948: 8.0 C, +0.3 C from the station mean1949: 8.4 C, +0.6 C from the station mean1950: 6.6 C, -1.2 C from the station mean1951: 6.5 C, -1.3 C from the station mean1952: 8.3 C, +0.5 C from the station mean1953: 8.9 C, +1.1 C from the station mean1954: 8.0 C, +0.3 C from the station mean1955: 7.8 C, 0.0 C from the station mean1956: 7.5 C, -0.3 C from the station mean1957: 7.9 C, +0.2 C from the station mean1958: 7.5 C, -0.2 C from the station mean1959: 7.5 C, -0.3 C from the station mean1960: 7.7 C, -0.1 C from the station mean1961: 7.9 C, +0.2 C from the station mean1962: 7.0 C, -0.8 C from the station mean1964: 8.3 C, +0.6 C from the station mean1965: 7.2 C, -0.6 C from the station mean1966: 7.3 C, -0.5 C from the station mean1967: 7.0 C, -0.8 C from the station mean1968: 8.1 C, +0.3 C from the station mean1969: 7.2 C, -0.5 C from the station mean1970: 7.5 C, -0.2 C from the station mean1971: 7.7 C, -0.1 C from the station mean1972: 6.3 C, -1.4 C from the station mean1973: 8.9 C, +1.1 C from the station mean1974: 7.6 C, -0.2 C from the station mean1975: 8.0 C, +0.3 C from the station mean1976: 7.1 C, -0.7 C from the station mean1977: 7.7 C, -0.1 C from the station mean1978: 6.6 C, -1.2 C from the station mean1979: 6.1 C, -1.6 C from the station mean1981: 7.8 C, +0.1 C from the station mean1982: 7.2 C, -0.6 C from the station mean1983: 8.2 C, +0.4 C from the station mean1984: 8.3 C, +0.5 C from the station mean1985: 7.3 C, -0.5 C from the station mean1986: 8.2 C, +0.4 C from the station mean1987: 9.8 C, +2.0 C from the station mean1988: 8.3 C, +0.6 C from the station mean1989: 6.9 C, -0.9 C from the station mean1991: 8.4 C, +0.6 C from the station mean1992: 7.6 C, -0.2 C from the station mean1993: 7.1 C, -0.6 C from the station mean1994: 7.6 C, -0.2 C from the station mean1995: 7.6 C, -0.1 C from the station mean1996: 6.4 C, -1.4 C from the station mean1997: 7.2 C, -0.6 C from the station mean1998: 9.9 C, +2.1 C from the station mean1999: 9.0 C, +1.2 C from the station mean2001: 8.8 C, +1.1 C from the station mean2002: 8.7 C, +0.9 C from the station mean2003: 7.5 C, -0.3 C from the station mean2004: 7.1 C, -0.6 C from the station mean2005: 8.0 C, +0.2 C from the station mean2006: 8.6 C, +0.8 C from the station mean2007: 7.9 C, +0.1 C from the station mean2008: 6.4 C, -1.4 C from the station mean2009: 6.4 C, -1.4 C from the station mean2010: 7.9 C, +0.1 C from the station mean2011: 7.0 C, -0.8 C from the station mean2012: 9.1 C, +1.4 C from the station mean2013: 6.0 C, -1.8 C from the station mean2014: 5.1 C, -2.7 C from the station mean2015: 7.6 C, -0.2 C from the station mean2016: 8.3 C, +0.5 C from the station mean2017: 7.5 C, -0.3 C from the station mean2018: 6.8 C, -0.9 C from the station mean2019: 6.3 C, -1.5 C from the station mean2020: 8.8 C, +1.0 C from the station mean2023: 9.1 C, +1.4 C from the station mean2025: 8.2 C, +0.4 C from the station mean18931900191019201930194019501960197019801990200020102020
One stripe for each of 118 complete years at Fond du Lac Wwtp, 1893 to 2025. Blue stripes are years cooler than the station's own mean of 7.8 C (46.0 F); red stripes are warmer. The coolest year was 2014, at 5.1 C (41.2 F), and the warmest was 1931, at 11.2 C (52.2 F). The strongest colour marks a difference of 3.5 C (6.3 F).
Annual mean temperature at Fond du Lac Wwtp as warming stripes, 1893 to 2025
YearAnnual mean temperatureDifference from the station mean
18935.5 C-2.25 C
18948.1 C+0.33 C
18977.4 C-0.41 C
19028.3 C+0.50 C
19037.5 C-0.27 C
19046.0 C-1.76 C
19056.6 C-1.16 C
19076.8 C-0.95 C
19088.1 C+0.31 C
19097.1 C-0.69 C
19107.3 C-0.43 C
19118.1 C+0.30 C
19126.4 C-1.32 C
19138.0 C+0.19 C
19147.6 C-0.15 C
19157.4 C-0.32 C
19167.1 C-0.67 C
19175.4 C-2.32 C
19187.9 C+0.10 C
19198.3 C+0.50 C
19207.2 C-0.58 C
19219.7 C+1.93 C
19228.6 C+0.82 C
19238.0 C+0.28 C
19246.2 C-1.53 C
19257.7 C-0.09 C
19267.4 C-0.40 C
19278.7 C+0.92 C
19288.8 C+1.00 C
19297.5 C-0.30 C
19309.3 C+1.54 C
193111.2 C+3.47 C
19329.0 C+1.28 C
19339.4 C+1.60 C
19349.6 C+1.79 C
19358.3 C+0.56 C
19368.0 C+0.22 C
19378.3 C+0.52 C
19389.6 C+1.81 C
19399.7 C+1.92 C
19407.7 C-0.08 C
19419.2 C+1.40 C
19437.1 C-0.63 C
19448.2 C+0.46 C
19457.1 C-0.66 C
19468.4 C+0.68 C
19477.8 C+0.04 C
19488.0 C+0.26 C
19498.4 C+0.64 C
19506.6 C-1.18 C
19516.5 C-1.27 C
19528.3 C+0.52 C
19538.9 C+1.14 C
19548.0 C+0.27 C
19557.8 C0.00 C
19567.5 C-0.26 C
19577.9 C+0.17 C
19587.5 C-0.23 C
19597.5 C-0.30 C
19607.7 C-0.08 C
19617.9 C+0.18 C
19627.0 C-0.80 C
19648.3 C+0.56 C
19657.2 C-0.57 C
19667.3 C-0.46 C
19677.0 C-0.75 C
19688.1 C+0.32 C
19697.2 C-0.53 C
19707.5 C-0.24 C
19717.7 C-0.06 C
19726.3 C-1.44 C
19738.9 C+1.14 C
19747.6 C-0.15 C
19758.0 C+0.26 C
19767.1 C-0.69 C
19777.7 C-0.11 C
19786.6 C-1.21 C
19796.1 C-1.63 C
19817.8 C+0.06 C
19827.2 C-0.61 C
19838.2 C+0.45 C
19848.3 C+0.54 C
19857.3 C-0.47 C
19868.2 C+0.41 C
19879.8 C+2.02 C
19888.3 C+0.58 C
19896.9 C-0.91 C
19918.4 C+0.64 C
19927.6 C-0.20 C
19937.1 C-0.63 C
19947.6 C-0.15 C
19957.6 C-0.14 C
19966.4 C-1.35 C
19977.2 C-0.56 C
19989.9 C+2.13 C
19999.0 C+1.21 C
20018.8 C+1.08 C
20028.7 C+0.94 C
20037.5 C-0.30 C
20047.1 C-0.63 C
20058.0 C+0.23 C
20068.6 C+0.81 C
20077.9 C+0.15 C
20086.4 C-1.40 C
20096.4 C-1.41 C
20107.9 C+0.15 C
20117.0 C-0.78 C
20129.1 C+1.37 C
20136.0 C-1.76 C
20145.1 C-2.66 C
20157.6 C-0.18 C
20168.3 C+0.49 C
20177.5 C-0.25 C
20186.8 C-0.94 C
20196.3 C-1.49 C
20208.8 C+1.02 C
20239.1 C+1.36 C
20258.2 C+0.42 C

The fitted trend in annual mean temperature here over 1893 to 2025 is -0.01 C (-0.06 to 0.04) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.01 F (-0.10 to 0.08) per decade. The slope is a straight line fitted to 118 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Fond du Lac Wwtp
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature-0.01 C (-0.06 to 0.04) per decade-0.01 F (-0.10 to 0.08) per decade1893 to 2025118Not clearly different from zero
Mean daily maximum-0.1 C (-0.2 to -0.1) per decade-0.2 F (-0.3 to -0.1) per decade1893 to 2025118Fall
Mean daily minimum0.1 C (0.1 to 0.2) per decade0.2 F (0.1 to 0.3) per decade1893 to 2025118Rise

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1893 to 2026
Yearly extremes at Fond du Lac Wwtp: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)43.9 C (111.0 F)193635.0 C (95.0 F)134
Coldest night (TNn)-40.6 C (-41.1 F)1951-27.2 C (-17.0 F)134
Wettest day (Rx1day)173.5 mm (6.8 in)198651.8 mm (2.0 in)134
Wettest five days (Rx5day)204.0 mm (8.0 in)192479.6 mm (3.1 in)134
Longest dry spell (CDD)48 days201521 days134

Hottest day (TXx)

Hottest day (TXx) at Fond du Lac Wwtp by year The hottest day of the year at Fond du Lac Wwtp, 1893 to 2026. The record is 43.9 C (111.0 F) in 1936, marked on the chart; the median year is 35.0 C (95.0 F). 303540451900192019401960198020002020Record: 43.9 C (111.0 F) in 1936
The hottest day of the year at Fond du Lac Wwtp, 1893 to 2026. The record is 43.9 C (111.0 F) in 1936, marked on the chart; the median year is 35.0 C (95.0 F).
Hottest day (TXx) at Fond du Lac Wwtp by year
YearHottest day (TXx)
189334.4 C (93.9 F)
189437.8 C (100.0 F)
189535.6 C (96.1 F)
189631.7 C (89.1 F)
189736.1 C (97.0 F)
189835.6 C (96.1 F)
189932.2 C (90.0 F)
190035.0 C (95.0 F)
190131.7 C (89.1 F)
190232.8 C (91.0 F)
190332.8 C (91.0 F)
190435.6 C (96.1 F)
190535.0 C (95.0 F)
190633.9 C (93.0 F)
190732.8 C (91.0 F)
190836.1 C (97.0 F)
190937.2 C (99.0 F)
191036.7 C (98.1 F)
191136.1 C (97.0 F)
191236.7 C (98.1 F)
191336.7 C (98.1 F)
191437.2 C (99.0 F)
191532.8 C (91.0 F)
191641.1 C (106.0 F)
191737.2 C (99.0 F)
191838.9 C (102.0 F)
191937.2 C (99.0 F)
192035.0 C (95.0 F)
192138.3 C (100.9 F)
192233.9 C (93.0 F)
192335.6 C (96.1 F)
192431.7 C (89.1 F)
192535.0 C (95.0 F)
192636.7 C (98.1 F)
192736.7 C (98.1 F)
192836.1 C (97.0 F)
192934.4 C (93.9 F)
193038.9 C (102.0 F)
193140.0 C (104.0 F)
193238.3 C (100.9 F)
193337.2 C (99.0 F)
193441.7 C (107.1 F)
193536.7 C (98.1 F)
193643.9 C (111.0 F)
193739.4 C (102.9 F)
193835.0 C (95.0 F)
193938.3 C (100.9 F)
194038.3 C (100.9 F)
194138.9 C (102.0 F)
194235.0 C (95.0 F)
194335.0 C (95.0 F)
194438.9 C (102.0 F)
194534.4 C (93.9 F)
194634.4 C (93.9 F)
194738.3 C (100.9 F)
194838.3 C (100.9 F)
194936.1 C (97.0 F)
195033.3 C (91.9 F)
195132.2 C (90.0 F)
195234.4 C (93.9 F)
195337.2 C (99.0 F)
195434.4 C (93.9 F)
195536.7 C (98.1 F)
195634.4 C (93.9 F)
195733.3 C (91.9 F)
195833.9 C (93.0 F)
195935.0 C (95.0 F)
196033.3 C (91.9 F)
196134.4 C (93.9 F)
196233.3 C (91.9 F)
196335.6 C (96.1 F)
196436.7 C (98.1 F)
196535.0 C (95.0 F)
196636.1 C (97.0 F)
196732.8 C (91.0 F)
196835.0 C (95.0 F)
196932.8 C (91.0 F)
197035.0 C (95.0 F)
197134.4 C (93.9 F)
197233.9 C (93.0 F)
197335.0 C (95.0 F)
197437.2 C (99.0 F)
197535.0 C (95.0 F)
197636.7 C (98.1 F)
197736.7 C (98.1 F)
197833.3 C (91.9 F)
197932.2 C (90.0 F)
198033.9 C (93.0 F)
198132.8 C (91.0 F)
198235.0 C (95.0 F)
198336.7 C (98.1 F)
198434.4 C (93.9 F)
198535.0 C (95.0 F)
198635.6 C (96.1 F)
198736.1 C (97.0 F)
198838.9 C (102.0 F)
198933.3 C (91.9 F)
199033.3 C (91.9 F)
199134.4 C (93.9 F)
199232.8 C (91.0 F)
199332.2 C (90.0 F)
199436.1 C (97.0 F)
199539.4 C (102.9 F)
199634.4 C (93.9 F)
199733.3 C (91.9 F)
199833.3 C (91.9 F)
199936.1 C (97.0 F)
200033.3 C (91.9 F)
200136.1 C (97.0 F)
200235.6 C (96.1 F)
200333.9 C (93.0 F)
200430.6 C (87.1 F)
200533.9 C (93.0 F)
200635.6 C (96.1 F)
200733.3 C (91.9 F)
200831.7 C (89.1 F)
200932.8 C (91.0 F)
201032.2 C (90.0 F)
201134.4 C (93.9 F)
201237.2 C (99.0 F)
201333.3 C (91.9 F)
201431.1 C (88.0 F)
201532.2 C (90.0 F)
201631.7 C (89.1 F)
201731.7 C (89.1 F)
201833.3 C (91.9 F)
201931.7 C (89.1 F)
202033.3 C (91.9 F)
202133.3 C (91.9 F)
202234.4 C (93.9 F)
202335.6 C (96.1 F)
202432.2 C (90.0 F)
202533.9 C (93.0 F)
202635.6 C (96.1 F)

Coldest night (TNn)

Coldest night (TNn) at Fond du Lac Wwtp by year The coldest night of the year at Fond du Lac Wwtp, 1893 to 2026. The record is -40.6 C (-41.1 F) in 1951, marked on the chart; the median year is -27.2 C (-17.0 F). -50-40-30-20-101900192019401960198020002020Record: -40.6 C (-41.1 F) in 1951
The coldest night of the year at Fond du Lac Wwtp, 1893 to 2026. The record is -40.6 C (-41.1 F) in 1951, marked on the chart; the median year is -27.2 C (-17.0 F).
Coldest night (TNn) at Fond du Lac Wwtp by year
YearColdest night (TNn)
1893-33.9 C (-29.0 F)
1894-29.4 C (-20.9 F)
1895-27.2 C (-17.0 F)
1896-27.2 C (-17.0 F)
1897-29.4 C (-20.9 F)
1898-24.4 C (-11.9 F)
1899-34.4 C (-29.9 F)
1900-25.6 C (-14.1 F)
1901-27.8 C (-18.0 F)
1902-26.7 C (-16.1 F)
1903-29.4 C (-20.9 F)
1904-33.3 C (-27.9 F)
1905-32.8 C (-27.0 F)
1906-27.2 C (-17.0 F)
1907-28.3 C (-18.9 F)
1908-25.6 C (-14.1 F)
1909-30.6 C (-23.1 F)
1910-32.2 C (-26.0 F)
1911-30.6 C (-23.1 F)
1912-32.2 C (-26.0 F)
1913-26.1 C (-15.0 F)
1914-33.3 C (-27.9 F)
1915-31.7 C (-25.1 F)
1916-28.9 C (-20.0 F)
1917-30.0 C (-22.0 F)
1918-35.0 C (-31.0 F)
1919-30.0 C (-22.0 F)
1920-26.1 C (-15.0 F)
1921-22.2 C (-8.0 F)
1922-26.7 C (-16.1 F)
1923-27.8 C (-18.0 F)
1924-30.6 C (-23.1 F)
1925-24.4 C (-11.9 F)
1926-26.7 C (-16.1 F)
1927-26.7 C (-16.1 F)
1928-25.6 C (-14.1 F)
1929-27.8 C (-18.0 F)
1930-30.6 C (-23.1 F)
1931-21.1 C (-6.0 F)
1932-26.1 C (-15.0 F)
1933-31.7 C (-25.1 F)
1934-25.0 C (-13.0 F)
1935-29.4 C (-20.9 F)
1936-31.1 C (-24.0 F)
1937-22.2 C (-8.0 F)
1938-24.4 C (-11.9 F)
1939-21.7 C (-7.1 F)
1940-28.9 C (-20.0 F)
1941-25.0 C (-13.0 F)
1942-31.1 C (-24.0 F)
1943-31.1 C (-24.0 F)
1944-27.2 C (-17.0 F)
1945-27.8 C (-18.0 F)
1946-25.6 C (-14.1 F)
1947-26.7 C (-16.1 F)
1948-30.0 C (-22.0 F)
1949-29.4 C (-20.9 F)
1950-27.2 C (-17.0 F)
1951-40.6 C (-41.1 F)
1952-31.7 C (-25.1 F)
1953-23.9 C (-11.0 F)
1954-28.9 C (-20.0 F)
1955-27.2 C (-17.0 F)
1956-25.0 C (-13.0 F)
1957-27.2 C (-17.0 F)
1958-25.6 C (-14.1 F)
1959-34.4 C (-29.9 F)
1960-23.9 C (-11.0 F)
1961-25.0 C (-13.0 F)
1962-31.1 C (-24.0 F)
1963-33.3 C (-27.9 F)
1964-22.8 C (-9.0 F)
1965-29.4 C (-20.9 F)
1966-31.7 C (-25.1 F)
1967-28.9 C (-20.0 F)
1968-28.3 C (-18.9 F)
1969-26.1 C (-15.0 F)
1970-28.9 C (-20.0 F)
1971-27.2 C (-17.0 F)
1972-32.2 C (-26.0 F)
1973-23.3 C (-9.9 F)
1974-26.1 C (-15.0 F)
1975-25.6 C (-14.1 F)
1976-26.1 C (-15.0 F)
1977-35.6 C (-32.1 F)
1978-23.9 C (-11.0 F)
1979-30.6 C (-23.1 F)
1980-23.9 C (-11.0 F)
1981-25.0 C (-13.0 F)
1982-32.2 C (-26.0 F)
1983-31.1 C (-24.0 F)
1984-28.9 C (-20.0 F)
1985-32.8 C (-27.0 F)
1986-25.6 C (-14.1 F)
1987-24.4 C (-11.9 F)
1988-25.6 C (-14.1 F)
1989-28.9 C (-20.0 F)
1990-25.0 C (-13.0 F)
1991-26.7 C (-16.1 F)
1992-23.3 C (-9.9 F)
1993-23.9 C (-11.0 F)
1994-33.3 C (-27.9 F)
1995-23.3 C (-9.9 F)
1996-33.9 C (-29.0 F)
1997-25.6 C (-14.1 F)
1998-22.8 C (-9.0 F)
1999-26.7 C (-16.1 F)
2000-22.8 C (-9.0 F)
2001-18.9 C (-2.0 F)
2002-23.3 C (-9.9 F)
2003-22.8 C (-9.0 F)
2004-26.7 C (-16.1 F)
2005-22.8 C (-9.0 F)
2006-28.3 C (-18.9 F)
2007-27.2 C (-17.0 F)
2008-25.0 C (-13.0 F)
2009-28.3 C (-18.9 F)
2010-21.7 C (-7.1 F)
2011-26.1 C (-15.0 F)
2012-22.8 C (-9.0 F)
2013-25.6 C (-14.1 F)
2014-29.4 C (-20.9 F)
2015-25.6 C (-14.1 F)
2016-24.4 C (-11.9 F)
2017-25.0 C (-13.0 F)
2018-25.6 C (-14.1 F)
2019-33.3 C (-27.9 F)
2020-23.9 C (-11.0 F)
2021-31.7 C (-25.1 F)
2022-23.9 C (-11.0 F)
2023-22.8 C (-9.0 F)
2024-23.9 C (-11.0 F)
2025-26.1 C (-15.0 F)
2026-28.3 C (-18.9 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Fond du Lac Wwtp by year The wettest day of the year at Fond du Lac Wwtp, 1893 to 2026. The record is 173.5 mm (6.8 in) in 1986, marked on the chart; the median year is 51.8 mm (2.0 in). 0501001502001900192019401960198020002020Record: 173.5 mm (6.8 in) in 1986
The wettest day of the year at Fond du Lac Wwtp, 1893 to 2026. The record is 173.5 mm (6.8 in) in 1986, marked on the chart; the median year is 51.8 mm (2.0 in).
Wettest day (Rx1day) at Fond du Lac Wwtp by year
YearWettest day (Rx1day)
189370.9 mm (2.8 in)
189429.7 mm (1.2 in)
189561.0 mm (2.4 in)
189633.0 mm (1.3 in)
189753.6 mm (2.1 in)
189830.5 mm (1.2 in)
189928.4 mm (1.1 in)
190054.4 mm (2.1 in)
190131.5 mm (1.2 in)
190281.8 mm (3.2 in)
190370.9 mm (2.8 in)
190441.1 mm (1.6 in)
190553.3 mm (2.1 in)
190650.5 mm (2.0 in)
190777.2 mm (3.0 in)
190858.4 mm (2.3 in)
190948.8 mm (1.9 in)
191043.2 mm (1.7 in)
191161.0 mm (2.4 in)
191258.9 mm (2.3 in)
191355.1 mm (2.2 in)
191453.8 mm (2.1 in)
191551.3 mm (2.0 in)
191648.5 mm (1.9 in)
191752.3 mm (2.1 in)
191836.3 mm (1.4 in)
191955.9 mm (2.2 in)
192048.0 mm (1.9 in)
192142.7 mm (1.7 in)
192240.6 mm (1.6 in)
192388.9 mm (3.5 in)
1924134.6 mm (5.3 in)
192538.1 mm (1.5 in)
192659.2 mm (2.3 in)
192744.5 mm (1.8 in)
192846.5 mm (1.8 in)
192940.6 mm (1.6 in)
193038.1 mm (1.5 in)
193148.3 mm (1.9 in)
193243.4 mm (1.7 in)
193387.1 mm (3.4 in)
193459.7 mm (2.4 in)
193544.2 mm (1.7 in)
193655.4 mm (2.2 in)
193753.3 mm (2.1 in)
193873.7 mm (2.9 in)
193946.0 mm (1.8 in)
194086.4 mm (3.4 in)
194156.6 mm (2.2 in)
194250.8 mm (2.0 in)
194324.1 mm (0.9 in)
194440.6 mm (1.6 in)
194544.2 mm (1.7 in)
194650.0 mm (2.0 in)
194754.9 mm (2.2 in)
194829.0 mm (1.1 in)
194929.2 mm (1.1 in)
195069.3 mm (2.7 in)
195142.4 mm (1.7 in)
195293.2 mm (3.7 in)
195336.6 mm (1.4 in)
195468.6 mm (2.7 in)
195545.7 mm (1.8 in)
195656.9 mm (2.2 in)
195741.9 mm (1.6 in)
195825.7 mm (1.0 in)
195950.3 mm (2.0 in)
196046.7 mm (1.8 in)
196171.4 mm (2.8 in)
196239.9 mm (1.6 in)
196346.7 mm (1.8 in)
196434.8 mm (1.4 in)
196561.0 mm (2.4 in)
196678.2 mm (3.1 in)
196735.6 mm (1.4 in)
196843.7 mm (1.7 in)
196953.6 mm (2.1 in)
197037.6 mm (1.5 in)
197152.6 mm (2.1 in)
197249.8 mm (2.0 in)
197327.7 mm (1.1 in)
197466.5 mm (2.6 in)
197532.8 mm (1.3 in)
197646.5 mm (1.8 in)
197743.7 mm (1.7 in)
1978145.8 mm (5.7 in)
197941.9 mm (1.6 in)
198058.4 mm (2.3 in)
198158.2 mm (2.3 in)
198271.9 mm (2.8 in)
198356.4 mm (2.2 in)
198441.9 mm (1.6 in)
198556.6 mm (2.2 in)
1986173.5 mm (6.8 in)
198738.9 mm (1.5 in)
198883.1 mm (3.3 in)
198996.8 mm (3.8 in)
1990113.0 mm (4.4 in)
199194.0 mm (3.7 in)
199280.8 mm (3.2 in)
199384.8 mm (3.3 in)
199447.8 mm (1.9 in)
199544.5 mm (1.8 in)
199678.0 mm (3.1 in)
199763.2 mm (2.5 in)
199860.5 mm (2.4 in)
199960.5 mm (2.4 in)
200047.2 mm (1.9 in)
200147.0 mm (1.9 in)
200240.6 mm (1.6 in)
200344.7 mm (1.8 in)
200470.9 mm (2.8 in)
200543.9 mm (1.7 in)
200650.8 mm (2.0 in)
200748.0 mm (1.9 in)
2008103.4 mm (4.1 in)
200947.0 mm (1.9 in)
201082.3 mm (3.2 in)
201135.6 mm (1.4 in)
201278.2 mm (3.1 in)
201352.3 mm (2.1 in)
201456.1 mm (2.2 in)
201562.7 mm (2.5 in)
201653.1 mm (2.1 in)
2017100.3 mm (3.9 in)
201870.1 mm (2.8 in)
201972.9 mm (2.9 in)
202082.6 mm (3.3 in)
202179.5 mm (3.1 in)
202245.7 mm (1.8 in)
202347.5 mm (1.9 in)
202473.7 mm (2.9 in)
202545.7 mm (1.8 in)
202639.6 mm (1.6 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Fond du Lac Wwtp by year The wettest five days of the year at Fond du Lac Wwtp, 1893 to 2026. The record is 204.0 mm (8.0 in) in 1924, marked on the chart; the median year is 79.6 mm (3.1 in). 0501001502002501900192019401960198020002020Record: 204.0 mm (8.0 in) in 1924
The wettest five days of the year at Fond du Lac Wwtp, 1893 to 2026. The record is 204.0 mm (8.0 in) in 1924, marked on the chart; the median year is 79.6 mm (3.1 in).
Wettest five days (Rx5day) at Fond du Lac Wwtp by year
YearWettest five days (Rx5day)
189394.0 mm (3.7 in)
189454.4 mm (2.1 in)
189566.6 mm (2.6 in)
189657.5 mm (2.3 in)
189758.4 mm (2.3 in)
189861.5 mm (2.4 in)
189956.7 mm (2.2 in)
190058.4 mm (2.3 in)
190148.5 mm (1.9 in)
1902115.3 mm (4.5 in)
1903128.1 mm (5.0 in)
190471.8 mm (2.8 in)
1905137.6 mm (5.4 in)
190652.3 mm (2.1 in)
190778.5 mm (3.1 in)
190898.0 mm (3.9 in)
190974.7 mm (2.9 in)
191059.6 mm (2.3 in)
191172.7 mm (2.9 in)
1912110.1 mm (4.3 in)
191384.4 mm (3.3 in)
1914113.6 mm (4.5 in)
1915135.8 mm (5.3 in)
191673.2 mm (2.9 in)
191771.6 mm (2.8 in)
191879.3 mm (3.1 in)
191970.4 mm (2.8 in)
192077.7 mm (3.1 in)
192180.3 mm (3.2 in)
192270.4 mm (2.8 in)
1923102.6 mm (4.0 in)
1924204.0 mm (8.0 in)
192559.2 mm (2.3 in)
192673.4 mm (2.9 in)
1927101.8 mm (4.0 in)
192876.7 mm (3.0 in)
192962.0 mm (2.4 in)
193069.1 mm (2.7 in)
193174.8 mm (2.9 in)
193248.5 mm (1.9 in)
193395.2 mm (3.7 in)
193481.0 mm (3.2 in)
193554.2 mm (2.1 in)
193676.5 mm (3.0 in)
193753.3 mm (2.1 in)
1938126.7 mm (5.0 in)
193960.6 mm (2.4 in)
1940169.5 mm (6.7 in)
194188.6 mm (3.5 in)
1942103.4 mm (4.1 in)
194383.4 mm (3.3 in)
194471.1 mm (2.8 in)
1945110.3 mm (4.3 in)
194668.1 mm (2.7 in)
194775.2 mm (3.0 in)
194854.9 mm (2.2 in)
194948.5 mm (1.9 in)
1950162.0 mm (6.4 in)
195156.7 mm (2.2 in)
1952149.3 mm (5.9 in)
195382.9 mm (3.3 in)
1954103.1 mm (4.1 in)
195594.0 mm (3.7 in)
195687.4 mm (3.4 in)
195758.4 mm (2.3 in)
195855.3 mm (2.2 in)
195975.1 mm (3.0 in)
196098.5 mm (3.9 in)
1961101.6 mm (4.0 in)
196247.5 mm (1.9 in)
1963107.2 mm (4.2 in)
196474.1 mm (2.9 in)
1965101.9 mm (4.0 in)
196680.2 mm (3.2 in)
196769.6 mm (2.7 in)
196860.6 mm (2.4 in)
1969134.2 mm (5.3 in)
197068.6 mm (2.7 in)
197154.7 mm (2.2 in)
197294.2 mm (3.7 in)
197353.4 mm (2.1 in)
197472.1 mm (2.8 in)
197582.9 mm (3.3 in)
197692.0 mm (3.6 in)
197752.6 mm (2.1 in)
1978150.6 mm (5.9 in)
197956.4 mm (2.2 in)
198089.9 mm (3.5 in)
198192.4 mm (3.6 in)
198287.2 mm (3.4 in)
198394.8 mm (3.7 in)
198469.7 mm (2.7 in)
198571.8 mm (2.8 in)
1986196.1 mm (7.7 in)
198746.8 mm (1.8 in)
1988114.6 mm (4.5 in)
1989139.8 mm (5.5 in)
1990147.3 mm (5.8 in)
1991127.7 mm (5.0 in)
1992143.3 mm (5.6 in)
1993118.4 mm (4.7 in)
199472.4 mm (2.9 in)
199567.9 mm (2.7 in)
1996113.4 mm (4.5 in)
1997134.8 mm (5.3 in)
199882.4 mm (3.2 in)
199988.1 mm (3.5 in)
200071.9 mm (2.8 in)
200170.5 mm (2.8 in)
200272.6 mm (2.9 in)
200386.3 mm (3.4 in)
2004144.4 mm (5.7 in)
200556.1 mm (2.2 in)
200669.8 mm (2.7 in)
200798.3 mm (3.9 in)
2008170.2 mm (6.7 in)
200950.8 mm (2.0 in)
201092.5 mm (3.6 in)
201162.7 mm (2.5 in)
201290.2 mm (3.6 in)
201373.1 mm (2.9 in)
2014106.4 mm (4.2 in)
201575.4 mm (3.0 in)
201675.2 mm (3.0 in)
2017100.3 mm (3.9 in)
2018191.1 mm (7.5 in)
201991.2 mm (3.6 in)
2020124.8 mm (4.9 in)
202179.8 mm (3.1 in)
202280.0 mm (3.1 in)
202359.6 mm (2.3 in)
202495.6 mm (3.8 in)
202557.6 mm (2.3 in)
202689.7 mm (3.5 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Fond du Lac Wwtp by year The longest dry spell of the year at Fond du Lac Wwtp, 1893 to 2026. The record is 48 days in 2015, marked on the chart; the median year is 21 days. 10203040501900192019401960198020002020Record: 48 days in 2015
The longest dry spell of the year at Fond du Lac Wwtp, 1893 to 2026. The record is 48 days in 2015, marked on the chart; the median year is 21 days.
Longest dry spell (CDD) at Fond du Lac Wwtp by year
YearLongest dry spell (CDD)
189335 days
189428 days
189520 days
189615 days
189724 days
189815 days
189921 days
190019 days
190117 days
190231 days
190330 days
190420 days
190526 days
190616 days
190717 days
190825 days
190915 days
191028 days
191131 days
191220 days
191324 days
191416 days
191516 days
191618 days
191720 days
191822 days
191925 days
192027 days
192116 days
192218 days
192321 days
192432 days
192531 days
192616 days
192716 days
192815 days
192913 days
193029 days
193119 days
193222 days
193324 days
193420 days
193517 days
193623 days
193716 days
193810 days
193930 days
194017 days
194128 days
194223 days
194325 days
194423 days
194516 days
194625 days
194725 days
194819 days
194918 days
195024 days
195114 days
195230 days
195327 days
195423 days
195521 days
195619 days
195724 days
195835 days
195925 days
196033 days
196121 days
196216 days
196323 days
196423 days
196515 days
196618 days
196728 days
196840 days
196925 days
197032 days
197115 days
197217 days
197317 days
197412 days
197514 days
197633 days
197729 days
197830 days
197917 days
198014 days
198131 days
198218 days
198313 days
198424 days
198513 days
198624 days
198723 days
198820 days
198921 days
199012 days
199133 days
199220 days
199315 days
199415 days
199521 days
199617 days
199717 days
199821 days
199936 days
200015 days
200118 days
200236 days
200322 days
200421 days
200516 days
200617 days
200733 days
200821 days
200926 days
201023 days
201118 days
201220 days
201317 days
201423 days
201548 days
201620 days
201716 days
201820 days
201927 days
202020 days
202123 days
202217 days
202322 days
202420 days
202536 days
202620 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Frost Dates and Growing Season

118 years with a frost

Across 118 years with a frost, the median last spring frost at Fond du Lac Wwtp falls on 4 May and the median first autumn frost on 8 October, which leaves a median of 157 days between them.

In 1992 to 2025 the median growing season was 166 days. That is 22 days more than in 1893 to 1929.

Fitted over all years, the growing season changes by +2.8 days per decade at this station.

Frost dates and growing season at Fond du Lac Wwtp
MeasureMedian, all yearsEarliest period (1893 to 1929)Recent period (1992 to 2025)Recent against earliestFitted trend
Last spring frost4 May11 May28 April13 days earlier-1.4 days per decade
First autumn frost8 October27 September13 October16 days later+1.4 days per decade
Growing days157 days144 days166 days22 days more+2.8 days per decade

A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.

Rainfall Return Levels

125 years, 1893 to 2025

A day with at least 52.2 mm (2.1 in) of rain is expected about once in 2 years. A day with at least 143.4 mm (5.6 in) of rain is expected about once in 100 years.

Rainfall return levels at Fond du Lac Wwtp: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years52.2 mm (2.1 in)
5 years70.6 mm (2.8 in)
10 years84.9 mm (3.3 in)
25 years105.8 mm (4.2 in)
50 years123.6 mm (4.9 in)
100 years143.4 mm (5.6 in)

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 125 years of values from 1893 to 2025.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 173.5 mm (6.8 in) in 1986; 145.8 mm (5.7 in) in 1978; 134.6 mm (5.3 in) in 1924.

Station Changes

1 suspected

One change was suspected in the annual mean temperature of Fond du Lac Wwtp, at 2010. Each is measured against neighbouring stations.

  • Relative to 5 neighbouring stations, the station's annual mean temperature from 2010 ran 0.4 C (0.8 F) lower than in the years before (likely change).
Suspected changes in the annual mean temperature at Fond du Lac Wwtp, against neighbouring stations
YearShift (C)Shift (F)StrengthNeighbours
2010-0.4-0.8likely5

Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.

Climate Twins

2008 to 2025 against 1961 to 1990

Over 2008 to 2025, Fond du Lac Wwtp had a mean temperature of 7.4 C (45.2 F) and 841.4 mm (33.1 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Plattsburgh AFB (United States, 1,196 km away), Marinette (United States, 159 km away) and Belleville (Canada, 885 km away).

Climate twins of Fond du Lac Wwtp: stations whose 1961 to 1990 climate is closest to its 2008 to 2025 climate
Twin stationCountryDistance awayMean temperature, 1961-1990Rain a year, 1961-1990Climate difference
Plattsburgh AFBUnited States1,196 km (743 mi)7.4 C (45.2 F)827.8 mm (32.6 in)0.48
MarinetteUnited States159 km (99 mi)7.5 C (45.5 F)819.4 mm (32.3 in)0.49
BellevilleCanada885 km (550 mi)7.3 C (45.2 F)848.0 mm (33.4 in)0.59

Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.

Download the Data

  • Data for Fond du Lac Wwtp standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Fond du Lac Wwtp threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-12).