Built 2026-10-17 (17 October 2026)

Mellette 4 W Weather Records (USC00395456)

Record envelope, standing records and threshold days for Mellette 4 W (USC00395456), South Dakota, United States, with 125 years of record.

Key Facts for Mellette 4 W

  • Mellette 4 W (USC00395456) is a weather station in South Dakota, United States at 45.16 latitude and -98.58 longitude, 395 m (1,296 ft) above sea level.
  • The station reports from 1893 to 2017, 125 years of record.
  • 1,464 records set at Mellette 4 W still stand.
  • Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Mellette 4 W set a daily record snowfall of 17.8 cm (7.0 in) on 13 March 2017.

About the Station

  • Location: South Dakota, United States, 45.16 latitude, -98.58 longitude.
  • Elevation: 395 m (1,296 ft).
  • Period of record: 1893 to 2017, 125 years.
  • Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Mellette 4 W, with 2026 drawn through them The band shows the record high and record low for each calendar day at Mellette 4 W. The lines show the 2026 daily maximum and minimum. 0 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 Mellette 4 W. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Mellette 4 W, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan17.2 C (63.0 F)-42.8 C (-45.0 F)n/an/a
Feb21.7 C (71.1 F)-42.8 C (-45.0 F)n/an/a
Mar30.6 C (87.1 F)-33.9 C (-29.0 F)n/an/a
Apr37.2 C (99.0 F)-21.7 C (-7.1 F)n/an/a
May42.2 C (108.0 F)-9.4 C (15.1 F)n/an/a
Jun43.3 C (109.9 F)-1.7 C (28.9 F)n/an/a
Jul45.0 C (113.0 F)1.1 C (34.0 F)n/an/a
Aug45.6 C (114.1 F)0.0 C (32.0 F)n/an/a
Sep41.1 C (106.0 F)-8.9 C (16.0 F)n/an/a
Oct35.6 C (96.1 F)-22.2 C (-8.0 F)n/an/a
Nov26.1 C (79.0 F)-32.2 C (-26.0 F)n/an/a
Dec20.0 C (68.0 F)-40.6 C (-41.1 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Mellette 4 W by the year they were set 1,464 records at Mellette 4 W still stand. 1934 holds the most, with 37. 0102030401895: 61896: 231897: 301898: 91899: 211900: 81901: 131902: 161903: 121904: 101905: 171906: 101907: 151908: 111909: 151910: 211911: 151912: 171913: 151914: 121915: 111916: 171917: 271918: 121919: 211920: 51921: 181922: 51923: 141924: 141925: 151926: 131927: 141928: 121929: 121930: 131931: 321932: 131933: 141934: 371935: 151936: 371937: 141938: 121939: 211940: 101941: 141942: 141943: 151944: 71945: 111946: 101947: 201948: 121949: 131950: 71951: 141952: 131953: 61954: 31955: 121956: 101957: 51958: 111959: 161960: 31961: 41962: 131963: 81964: 111965: 181966: 71967: 71968: 81969: 71970: 61971: 131972: 91973: 31974: 71975: 131976: 161977: 81978: 91979: 71980: 71981: 131982: 31983: 171984: 81985: 121986: 41987: 131988: 91989: 131990: 91991: 211992: 191993: 31994: 101995: 81996: 141997: 111998: 41999: 62000: 192001: 32002: 82003: 62004: 82005: 102006: 82007: 62008: 12009: 132010: 42011: 52012: 162013: 92014: 122015: 82016: 92017: 11895190819211934194719601973198619992012
1,464 records at Mellette 4 W still stand. 1934 holds the most, with 37.
Standing records at Mellette 4 W by the year they were set
Year setStanding records
18956
189623
189730
18989
189921
19008
190113
190216
190312
190410
190517
190610
190715
190811
190915
191021
191115
191217
191315
191412
191511
191617
191727
191812
191921
19205
192118
19225
192314
192414
192515
192613
192714
192812
192912
193013
193132
193213
193314
193437
193515
193637
193714
193812
193921
194010
194114
194214
194315
19447
194511
194610
194720
194812
194913
19507
195114
195213
19536
19543
195512
195610
19575
195811
195916
19603
19614
196213
19638
196411
196518
19667
19677
19688
19697
19706
197113
19729
19733
19747
197513
197616
19778
19789
19797
19807
198113
19823
198317
19848
198512
19864
198713
19889
198913
19909
199121
199219
19933
199410
19958
199614
199711
19984
19996
200019
20013
20028
20036
20048
200510
20068
20076
20081
200913
20104
20115
201216
20139
201412
20158
20169
20171

All-Time Record Progression

14 new records
When Mellette 4 W set new all-time records 14 all-time records were set at Mellette 4 W between 2 September 1926 and 25 February 2011. Each dot is a new record. Record daily precipitationRecord high maximum temperatureRecord high minimum temperatureRecord snow depth2 September 1926: Record daily precipitation 139.7 mm (5.5 in)28 June 1931: Record high maximum temperature 43.3 C (109.9 F)15 July 1931: Record high maximum temperature 44.4 C (111.9 F)11 July 1936: Record high minimum temperature 28.3 C (82.9 F)13 August 1965: Record high maximum temperature 45.6 C (114.1 F)6 May 2007: Record daily precipitation 171.5 mm (6.8 in)10 January 2011: Record snow depth 96.5 cm (38.0 in)16 January 2011: Record snow depth 101.6 cm (40.0 in)19 January 2011: Record snow depth 104.1 cm (41.0 in)31 January 2011: Record snow depth 116.8 cm (46.0 in)6 February 2011: Record snow depth 124.5 cm (49.0 in)21 February 2011: Record snow depth 137.2 cm (54.0 in)22 February 2011: Record snow depth 139.7 cm (55.0 in)25 February 2011: Record snow depth 142.2 cm (56.0 in)193519501965198019952010
14 all-time records were set at Mellette 4 W between 2 September 1926 and 25 February 2011. Each dot is a new record.
When Mellette 4 W set new all-time records
DateKindDetail
1926-09-02Record daily precipitationRecord daily precipitation 139.7 mm (5.5 in)
1931-06-28Record high maximum temperatureRecord high maximum temperature 43.3 C (109.9 F)
1931-07-15Record high maximum temperatureRecord high maximum temperature 44.4 C (111.9 F)
1936-07-11Record high minimum temperatureRecord high minimum temperature 28.3 C (82.9 F)
1965-08-13Record high maximum temperatureRecord high maximum temperature 45.6 C (114.1 F)
2007-05-06Record daily precipitationRecord daily precipitation 171.5 mm (6.8 in)
2011-01-10Record snow depthRecord snow depth 96.5 cm (38.0 in)
2011-01-16Record snow depthRecord snow depth 101.6 cm (40.0 in)
2011-01-19Record snow depthRecord snow depth 104.1 cm (41.0 in)
2011-01-31Record snow depthRecord snow depth 116.8 cm (46.0 in)
2011-02-06Record snow depthRecord snow depth 124.5 cm (49.0 in)
2011-02-21Record snow depthRecord snow depth 137.2 cm (54.0 in)
2011-02-22Record snow depthRecord snow depth 139.7 cm (55.0 in)
2011-02-25Record snow depthRecord snow depth 142.2 cm (56.0 in)

Wettest Day of Each Month

May: 171.5 mm (6.8 in)
Record daily precipitation for each month at Mellette 4 W The wettest day on record for each calendar month at Mellette 4 W. The most was 171.5 mm (6.8 in) on 6 May 2007. 050100150200 Jan: 56.6 mm (2.2 in), 9 January 1939 Jan Feb: 32.5 mm (1.3 in), 27 February 1958 Feb Mar: 50.8 mm (2.0 in), 28 March 1900 Mar Apr: 72.4 mm (2.9 in), 13 April 1912 Apr May: 171.5 mm (6.8 in), 6 May 2007 May Jun: 99.1 mm (3.9 in), 16 June 1935 Jun Jul: 78.7 mm (3.1 in), 3 July 1919 Jul Aug: 116.6 mm (4.6 in), 20 August 1984 Aug Sep: 139.7 mm (5.5 in), 2 September 1926 Sep Oct: 89.4 mm (3.5 in), 17 October 1998 Oct Nov: 32.5 mm (1.3 in), 17 November 1952 Nov Dec: 31.0 mm (1.2 in), 26 December 2016 Dec
The wettest day on record for each calendar month at Mellette 4 W. The most was 171.5 mm (6.8 in) on 6 May 2007.
Record daily precipitation for each month at Mellette 4 W
MonthRecord daily precipitation (mm)Date
Jan56.6 mm (2.2 in)9 January 1939
Feb32.5 mm (1.3 in)27 February 1958
Mar50.8 mm (2.0 in)28 March 1900
Apr72.4 mm (2.9 in)13 April 1912
May171.5 mm (6.8 in)6 May 2007
Jun99.1 mm (3.9 in)16 June 1935
Jul78.7 mm (3.1 in)3 July 1919
Aug116.6 mm (4.6 in)20 August 1984
Sep139.7 mm (5.5 in)2 September 1926
Oct89.4 mm (3.5 in)17 October 1998
Nov32.5 mm (1.3 in)17 November 1952
Dec31.0 mm (1.2 in)26 December 2016

Period of Record Coverage

1895 to 2017
Days with data per year at Mellette 4 W 123 years of record at Mellette 4 W, 1895 to 2017. 14 years have data for under 90 percent of days and are left out of rankings: 1895, 1896, 1898, 1899, 1901, 1905, 1922, 1969 and others. 1895: 127 of 365 days1896: 242 of 366 days1897: 364 of 365 days1898: 301 of 365 days1899: 325 of 365 days1900: 361 of 365 days1901: 315 of 365 days1902: 363 of 365 days1903: 362 of 365 days1904: 359 of 366 days1905: 308 of 365 days1906: 330 of 365 days1907: 362 of 365 days1908: 365 of 366 days1909: 357 of 365 days1910: 360 of 365 days1911: 362 of 365 days1912: 363 of 366 days1913: 364 of 365 days1914: 363 of 365 days1915: 365 of 365 days1916: 363 of 366 days1917: 364 of 365 days1918: 365 of 365 days1919: 364 of 365 days1920: 363 of 366 days1921: 362 of 365 days1922: 303 of 365 days1923: 362 of 365 days1924: 366 of 366 days1925: 363 of 365 days1926: 364 of 365 days1927: 365 of 365 days1928: 363 of 366 days1929: 364 of 365 days1930: 364 of 365 days1931: 364 of 365 days1932: 363 of 366 days1933: 364 of 365 days1934: 357 of 365 days1935: 361 of 365 days1936: 362 of 366 days1937: 362 of 365 days1938: 363 of 365 days1939: 363 of 365 days1940: 363 of 366 days1941: 362 of 365 days1942: 365 of 365 days1943: 359 of 365 days1944: 365 of 366 days1945: 364 of 365 days1946: 331 of 365 days1947: 363 of 365 days1948: 366 of 366 days1949: 365 of 365 days1950: 363 of 365 days1951: 364 of 365 days1952: 366 of 366 days1953: 365 of 365 days1954: 365 of 365 days1955: 364 of 365 days1956: 365 of 366 days1957: 365 of 365 days1958: 365 of 365 days1959: 364 of 365 days1960: 366 of 366 days1961: 365 of 365 days1962: 364 of 365 days1963: 365 of 365 days1964: 366 of 366 days1965: 365 of 365 days1966: 363 of 365 days1967: 362 of 365 days1968: 334 of 366 days1969: 184 of 365 days1970: 360 of 365 days1971: 362 of 365 days1972: 179 of 366 days1973: 120 of 365 days1974: 207 of 365 days1975: 363 of 365 days1976: 361 of 366 days1977: 357 of 365 days1978: 359 of 365 days1979: 300 of 365 days1980: 321 of 366 days1981: 364 of 365 days1982: 329 of 365 days1983: 358 of 365 days1984: 362 of 366 days1985: 362 of 365 days1986: 363 of 365 days1987: 364 of 365 days1988: 364 of 366 days1989: 361 of 365 days1990: 365 of 365 days1991: 365 of 365 days1992: 366 of 366 days1993: 364 of 365 days1994: 363 of 365 days1995: 364 of 365 days1996: 366 of 366 days1997: 364 of 365 days1998: 363 of 365 days1999: 364 of 365 days2000: 364 of 366 days2001: 364 of 365 days2002: 364 of 365 days2003: 331 of 365 days2004: 348 of 366 days2005: 349 of 365 days2006: 362 of 365 days2007: 362 of 365 days2008: 366 of 366 days2009: 365 of 365 days2010: 365 of 365 days2011: 365 of 365 days2012: 366 of 366 days2013: 335 of 365 days2014: 365 of 365 days2015: 365 of 365 days2016: 366 of 366 days2017: 90 of 365 days190019201940196019802000
123 years of record at Mellette 4 W, 1895 to 2017. 14 years have data for under 90 percent of days and are left out of rankings: 1895, 1896, 1898, 1899, 1901, 1905, 1922, 1969 and others.
Days with data per year at Mellette 4 W
YearDays with dataShare of yearComplete
189512735%No
189624266%No
1897364100%Yes
189830182%No
189932589%No
190036199%Yes
190131586%No
190236399%Yes
190336299%Yes
190435998%Yes
190530884%No
190633090%Yes
190736299%Yes
1908365100%Yes
190935798%Yes
191036099%Yes
191136299%Yes
191236399%Yes
1913364100%Yes
191436399%Yes
1915365100%Yes
191636399%Yes
1917364100%Yes
1918365100%Yes
1919364100%Yes
192036399%Yes
192136299%Yes
192230383%No
192336299%Yes
1924366100%Yes
192536399%Yes
1926364100%Yes
1927365100%Yes
192836399%Yes
1929364100%Yes
1930364100%Yes
1931364100%Yes
193236399%Yes
1933364100%Yes
193435798%Yes
193536199%Yes
193636299%Yes
193736299%Yes
193836399%Yes
193936399%Yes
194036399%Yes
194136299%Yes
1942365100%Yes
194335998%Yes
1944365100%Yes
1945364100%Yes
194633191%Yes
194736399%Yes
1948366100%Yes
1949365100%Yes
195036399%Yes
1951364100%Yes
1952366100%Yes
1953365100%Yes
1954365100%Yes
1955364100%Yes
1956365100%Yes
1957365100%Yes
1958365100%Yes
1959364100%Yes
1960366100%Yes
1961365100%Yes
1962364100%Yes
1963365100%Yes
1964366100%Yes
1965365100%Yes
196636399%Yes
196736299%Yes
196833491%Yes
196918450%No
197036099%Yes
197136299%Yes
197217949%No
197312033%No
197420757%No
197536399%Yes
197636199%Yes
197735798%Yes
197835998%Yes
197930082%No
198032188%No
1981364100%Yes
198232990%Yes
198335898%Yes
198436299%Yes
198536299%Yes
198636399%Yes
1987364100%Yes
198836499%Yes
198936199%Yes
1990365100%Yes
1991365100%Yes
1992366100%Yes
1993364100%Yes
199436399%Yes
1995364100%Yes
1996366100%Yes
1997364100%Yes
199836399%Yes
1999364100%Yes
200036499%Yes
2001364100%Yes
2002364100%Yes
200333191%Yes
200434895%Yes
200534996%Yes
200636299%Yes
200736299%Yes
2008366100%Yes
2009365100%Yes
2010365100%Yes
2011365100%Yes
2012366100%Yes
201333592%Yes
2014365100%Yes
2015365100%Yes
2016366100%Yes
20179025%No

Latest Records

20
Latest records at Mellette 4 W
DateStationRecordValueBeat old record byOld record stoodSignificance
13 March 2017Mellette 4 W, USdaily snowfall17.8 cm (7.0 in)2.6 cm (1.0 in)100 years44 of 100 (Notable)
20 February 2017Mellette 4 W, USdaily high min2.8 C (37.0 F)3.4 C (6.1 F)19 years18 of 100 (Routine)
26 December 2016Mellette 4 W, USmonthly rain31.0 mm (1.2 in)0.5 mm (0.02 in)84 years46 of 100 (Notable)
19 December 2016Mellette 4 W, USmonthly low min-40.6 C (-41.1 F)1.7 C (3.1 F)32 years31 of 100 (Routine)
18 December 2016Mellette 4 W, USdaily low min-37.2 C (-35.0 F)3.9 C (7.0 F)33 years24 of 100 (Routine)
17 December 2016Mellette 4 W, USdaily rain9.1 mm (0.36 in)0.7 mm (0.03 in)39 years20 of 100 (Routine)
17 December 2016Mellette 4 W, USdaily snowfall (Tie)10.2 cm (4.0 in)tie39 years5 of 100 (Routine)
11 December 2016Mellette 4 W, USdaily snowfall11.4 cm (4.5 in)1.7 cm (0.7 in)107 years44 of 100 (Notable)
28 November 2016Mellette 4 W, USdaily rain12.2 mm (0.5 in)1.0 mm (0.04 in)56 years20 of 100 (Routine)
13 November 2016Mellette 4 W, USdaily high max21.7 C (71.1 F)1.1 C (2.0 F)77 years34 of 100 (Routine)
6 November 2016Mellette 4 W, USdaily high max24.4 C (75.9 F)0.5 C (0.9 F)41 years22 of 100 (Routine)
1 November 2016Mellette 4 W, USdaily high max25.0 C (77.0 F)1.1 C (2.0 F)26 years18 of 100 (Routine)
11 August 2016Mellette 4 W, USdaily rain53.3 mm (2.1 in)9.4 mm (0.37 in)84 years42 of 100 (Notable)
21 July 2016Mellette 4 W, USdaily high min (Tie)22.2 C (72.0 F)tie61 years7 of 100 (Routine)
12 June 2016Mellette 4 W, USdaily high min21.7 C (71.1 F)1.1 C (2.0 F)60 years30 of 100 (Routine)
14 May 2016Mellette 4 W, USdaily low max (Tie)7.2 C (45.0 F)tie109 years10 of 100 (Routine)
6 May 2016Mellette 4 W, USdaily high max (Tie)33.9 C (93.0 F)tie16 years3 of 100 (Routine)
14 March 2016Mellette 4 W, USdaily high min2.8 C (37.0 F)1.1 C (2.0 F)96 years39 of 100 (Notable)
28 February 2016Mellette 4 W, USdaily high max21.1 C (70.0 F)6.1 C (11.0 F)94 years45 of 100 (Notable)
19 February 2016Mellette 4 W, USdaily high min0.6 C (33.1 F)0.6 C (1.1 F)116 years40 of 100 (Notable)

Climate Trend

101 complete years, 1897 to 2016
Annual mean temperature at Mellette 4 W as warming stripes, 1897 to 2016 One stripe for each of 101 complete years at Mellette 4 W, 1897 to 2016. Blue stripes are years cooler than the station's own mean of 6.6 C (43.9 F); red stripes are warmer. The coolest year was 1978, at 4.1 C (39.3 F), and the warmest was 1931, at 9.7 C (49.5 F). The strongest colour marks a difference of 3.2 C (5.8 F). 1897: 5.2 C, -1.4 C from the station mean1900: 7.4 C, +0.8 C from the station mean1902: 6.4 C, -0.2 C from the station mean1903: 5.7 C, -0.9 C from the station mean1904: 5.5 C, -1.1 C from the station mean1907: 5.4 C, -1.2 C from the station mean1908: 7.2 C, +0.6 C from the station mean1909: 6.0 C, -0.6 C from the station mean1910: 7.2 C, +0.6 C from the station mean1911: 6.3 C, -0.3 C from the station mean1912: 6.0 C, -0.6 C from the station mean1913: 7.1 C, +0.5 C from the station mean1914: 6.8 C, +0.2 C from the station mean1915: 6.1 C, -0.5 C from the station mean1916: 5.3 C, -1.3 C from the station mean1917: 4.8 C, -1.8 C from the station mean1918: 7.0 C, +0.4 C from the station mean1919: 6.2 C, -0.4 C from the station mean1920: 6.8 C, +0.2 C from the station mean1921: 8.6 C, +2.0 C from the station mean1923: 7.6 C, +1.0 C from the station mean1924: 5.7 C, -0.9 C from the station mean1925: 7.2 C, +0.6 C from the station mean1926: 7.5 C, +0.9 C from the station mean1927: 6.1 C, -0.5 C from the station mean1928: 7.5 C, +0.9 C from the station mean1929: 5.8 C, -0.8 C from the station mean1930: 8.0 C, +1.4 C from the station mean1931: 9.7 C, +3.1 C from the station mean1932: 6.7 C, +0.1 C from the station mean1933: 8.1 C, +1.5 C from the station mean1934: 9.1 C, +2.5 C from the station mean1935: 6.9 C, +0.3 C from the station mean1936: 6.0 C, -0.6 C from the station mean1937: 6.2 C, -0.4 C from the station mean1938: 8.1 C, +1.5 C from the station mean1939: 8.0 C, +1.4 C from the station mean1940: 7.0 C, +0.4 C from the station mean1941: 7.8 C, +1.2 C from the station mean1942: 6.9 C, +0.3 C from the station mean1943: 6.3 C, -0.3 C from the station mean1944: 7.4 C, +0.8 C from the station mean1945: 6.5 C, -0.1 C from the station mean1947: 6.9 C, +0.3 C from the station mean1948: 6.8 C, +0.2 C from the station mean1949: 7.3 C, +0.7 C from the station mean1950: 4.8 C, -1.8 C from the station mean1951: 5.0 C, -1.6 C from the station mean1952: 7.1 C, +0.5 C from the station mean1954: 7.8 C, +1.2 C from the station mean1955: 6.9 C, +0.3 C from the station mean1956: 6.8 C, +0.2 C from the station mean1957: 7.3 C, +0.7 C from the station mean1958: 7.4 C, +0.8 C from the station mean1959: 7.3 C, +0.7 C from the station mean1960: 6.0 C, -0.6 C from the station mean1961: 6.8 C, +0.2 C from the station mean1962: 6.6 C, 0.0 C from the station mean1963: 7.6 C, +1.0 C from the station mean1964: 7.2 C, +0.6 C from the station mean1965: 6.0 C, -0.6 C from the station mean1966: 5.7 C, -0.9 C from the station mean1967: 6.4 C, -0.2 C from the station mean1970: 5.9 C, -0.7 C from the station mean1971: 6.1 C, -0.5 C from the station mean1975: 6.1 C, -0.5 C from the station mean1976: 6.8 C, +0.2 C from the station mean1978: 4.1 C, -2.5 C from the station mean1981: 7.3 C, +0.7 C from the station mean1983: 6.2 C, -0.4 C from the station mean1984: 6.2 C, -0.4 C from the station mean1985: 4.7 C, -1.9 C from the station mean1986: 6.6 C, 0.0 C from the station mean1987: 8.8 C, +2.2 C from the station mean1988: 6.9 C, +0.3 C from the station mean1989: 5.4 C, -1.2 C from the station mean1990: 7.2 C, +0.6 C from the station mean1991: 7.4 C, +0.8 C from the station mean1992: 6.7 C, +0.1 C from the station mean1993: 4.6 C, -2.0 C from the station mean1994: 5.5 C, -1.1 C from the station mean1995: 5.7 C, -0.9 C from the station mean1996: 4.1 C, -2.5 C from the station mean1997: 5.7 C, -0.9 C from the station mean1998: 7.7 C, +1.1 C from the station mean1999: 7.8 C, +1.2 C from the station mean2000: 6.4 C, -0.2 C from the station mean2001: 6.6 C, 0.0 C from the station mean2002: 6.9 C, +0.3 C from the station mean2004: 6.6 C, 0.0 C from the station mean2005: 7.3 C, +0.7 C from the station mean2006: 7.9 C, +1.3 C from the station mean2007: 6.1 C, -0.5 C from the station mean2008: 4.9 C, -1.7 C from the station mean2009: 4.9 C, -1.7 C from the station mean2010: 6.2 C, -0.4 C from the station mean2011: 5.4 C, -1.2 C from the station mean2012: 7.8 C, +1.2 C from the station mean2014: 4.7 C, -1.9 C from the station mean2015: 7.1 C, +0.5 C from the station mean2016: 7.9 C, +1.3 C from the station mean189719101920193019401950196019701980199020002010
One stripe for each of 101 complete years at Mellette 4 W, 1897 to 2016. Blue stripes are years cooler than the station's own mean of 6.6 C (43.9 F); red stripes are warmer. The coolest year was 1978, at 4.1 C (39.3 F), and the warmest was 1931, at 9.7 C (49.5 F). The strongest colour marks a difference of 3.2 C (5.8 F).
Annual mean temperature at Mellette 4 W as warming stripes, 1897 to 2016
YearAnnual mean temperatureDifference from the station mean
18975.2 C-1.38 C
19007.4 C+0.85 C
19026.4 C-0.24 C
19035.7 C-0.94 C
19045.5 C-1.12 C
19075.4 C-1.20 C
19087.2 C+0.59 C
19096.0 C-0.59 C
19107.2 C+0.59 C
19116.3 C-0.34 C
19126.0 C-0.64 C
19137.1 C+0.55 C
19146.8 C+0.20 C
19156.1 C-0.53 C
19165.3 C-1.33 C
19174.8 C-1.77 C
19187.0 C+0.42 C
19196.2 C-0.37 C
19206.8 C+0.22 C
19218.6 C+2.04 C
19237.6 C+0.98 C
19245.7 C-0.88 C
19257.2 C+0.57 C
19267.5 C+0.88 C
19276.1 C-0.50 C
19287.5 C+0.88 C
19295.8 C-0.77 C
19308.0 C+1.44 C
19319.7 C+3.13 C
19326.7 C+0.06 C
19338.1 C+1.52 C
19349.1 C+2.47 C
19356.9 C+0.34 C
19366.0 C-0.63 C
19376.2 C-0.40 C
19388.1 C+1.46 C
19398.0 C+1.45 C
19407.0 C+0.36 C
19417.8 C+1.25 C
19426.9 C+0.33 C
19436.3 C-0.29 C
19447.4 C+0.76 C
19456.5 C-0.07 C
19476.9 C+0.34 C
19486.8 C+0.16 C
19497.3 C+0.69 C
19504.8 C-1.81 C
19515.0 C-1.62 C
19527.1 C+0.46 C
19547.8 C+1.19 C
19556.9 C+0.26 C
19566.8 C+0.25 C
19577.3 C+0.69 C
19587.4 C+0.80 C
19597.3 C+0.70 C
19606.0 C-0.64 C
19616.8 C+0.16 C
19626.6 C-0.02 C
19637.6 C+0.99 C
19647.2 C+0.56 C
19656.0 C-0.60 C
19665.7 C-0.91 C
19676.4 C-0.21 C
19705.9 C-0.68 C
19716.1 C-0.54 C
19756.1 C-0.54 C
19766.8 C+0.20 C
19784.1 C-2.51 C
19817.3 C+0.71 C
19836.2 C-0.37 C
19846.2 C-0.37 C
19854.7 C-1.87 C
19866.6 C-0.03 C
19878.8 C+2.23 C
19886.9 C+0.33 C
19895.4 C-1.21 C
19907.2 C+0.62 C
19917.4 C+0.79 C
19926.7 C+0.06 C
19934.6 C-1.97 C
19945.5 C-1.06 C
19955.7 C-0.87 C
19964.1 C-2.51 C
19975.7 C-0.93 C
19987.7 C+1.14 C
19997.8 C+1.20 C
20006.4 C-0.15 C
20016.6 C-0.02 C
20026.9 C+0.35 C
20046.6 C-0.02 C
20057.3 C+0.66 C
20067.9 C+1.29 C
20076.1 C-0.49 C
20084.9 C-1.72 C
20094.9 C-1.66 C
20106.2 C-0.38 C
20115.4 C-1.20 C
20127.8 C+1.16 C
20144.7 C-1.90 C
20157.1 C+0.51 C
20167.9 C+1.26 C

The fitted trend in annual mean temperature here over 1897 to 2016 is -0.03 C (-0.10 to 0.03) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.06 F (-0.17 to 0.05) per decade. The slope is a straight line fitted to 101 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Mellette 4 W
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature-0.03 C (-0.10 to 0.03) per decade-0.06 F (-0.17 to 0.05) per decade1897 to 2016101Not clearly different from zero
Mean daily maximum-0.08 C (-0.15 to 0.00) per decade-0.14 F (-0.27 to -0.01) per decade1897 to 2016101Fall
Mean daily minimum0.01 C (-0.05 to 0.07) per decade0.01 F (-0.09 to 0.12) per decade1897 to 2016101Not clearly different from zero

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 2017
Yearly extremes at Mellette 4 W: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)45.6 C (114.1 F)196538.9 C (102.0 F)123
Coldest night (TNn)-42.8 C (-45.0 F)1912-33.9 C (-29.0 F)123
Wettest day (Rx1day)171.5 mm (6.8 in)200749.0 mm (1.9 in)125
Wettest five days (Rx5day)207.0 mm (8.1 in)200773.6 mm (2.9 in)125
Longest dry spell (CDD)78 days195233 days125

Hottest day (TXx)

Hottest day (TXx) at Mellette 4 W by year The hottest day of the year at Mellette 4 W, 1893 to 2017. The record is 45.6 C (114.1 F) in 1965, marked on the chart; the median year is 38.9 C (102.0 F). 1020304050190019201940196019802000Record: 45.6 C (114.1 F) in 1965
The hottest day of the year at Mellette 4 W, 1893 to 2017. The record is 45.6 C (114.1 F) in 1965, marked on the chart; the median year is 38.9 C (102.0 F).
Hottest day (TXx) at Mellette 4 W by year
YearHottest day (TXx)
1893n/a
1894n/a
189540.6 C (105.1 F)
189638.3 C (100.9 F)
189738.9 C (102.0 F)
189839.4 C (102.9 F)
189941.1 C (106.0 F)
190041.1 C (106.0 F)
190141.1 C (106.0 F)
190238.9 C (102.0 F)
190336.1 C (97.0 F)
190437.2 C (99.0 F)
190537.2 C (99.0 F)
190637.8 C (100.0 F)
190737.2 C (99.0 F)
190837.8 C (100.0 F)
190936.7 C (98.1 F)
191038.3 C (100.9 F)
191138.9 C (102.0 F)
191237.8 C (100.0 F)
191340.0 C (104.0 F)
191440.0 C (104.0 F)
191530.6 C (87.1 F)
191638.9 C (102.0 F)
191742.8 C (109.0 F)
191836.7 C (98.1 F)
191939.4 C (102.9 F)
192037.2 C (99.0 F)
192138.9 C (102.0 F)
192238.9 C (102.0 F)
192336.7 C (98.1 F)
192434.4 C (93.9 F)
192540.6 C (105.1 F)
192638.9 C (102.0 F)
192737.8 C (100.0 F)
192839.4 C (102.9 F)
192939.4 C (102.9 F)
193041.1 C (106.0 F)
193144.4 C (111.9 F)
193241.1 C (106.0 F)
193341.7 C (107.1 F)
193444.4 C (111.9 F)
193540.6 C (105.1 F)
193644.4 C (111.9 F)
193743.3 C (109.9 F)
193842.2 C (108.0 F)
193938.9 C (102.0 F)
194044.4 C (111.9 F)
194142.8 C (109.0 F)
194236.1 C (97.0 F)
194342.2 C (108.0 F)
194437.8 C (100.0 F)
194539.4 C (102.9 F)
194636.7 C (98.1 F)
194742.8 C (109.0 F)
194840.6 C (105.1 F)
194942.2 C (108.0 F)
195038.9 C (102.0 F)
195137.8 C (100.0 F)
195239.4 C (102.9 F)
195336.7 C (98.1 F)
195437.8 C (100.0 F)
195541.1 C (106.0 F)
195640.0 C (104.0 F)
195738.3 C (100.9 F)
195840.6 C (105.1 F)
195942.2 C (108.0 F)
196038.9 C (102.0 F)
196137.2 C (99.0 F)
196236.7 C (98.1 F)
196337.8 C (100.0 F)
196439.4 C (102.9 F)
196545.6 C (114.1 F)
196644.4 C (111.9 F)
196738.9 C (102.0 F)
196838.9 C (102.0 F)
196936.1 C (97.0 F)
197038.3 C (100.9 F)
197140.0 C (104.0 F)
197232.2 C (90.0 F)
197328.9 C (84.0 F)
197439.4 C (102.9 F)
197543.3 C (109.9 F)
197642.2 C (108.0 F)
197740.6 C (105.1 F)
197838.9 C (102.0 F)
197938.9 C (102.0 F)
198041.1 C (106.0 F)
198140.0 C (104.0 F)
198240.0 C (104.0 F)
198340.6 C (105.1 F)
198437.2 C (99.0 F)
198538.3 C (100.9 F)
198638.3 C (100.9 F)
198741.7 C (107.1 F)
198843.3 C (109.9 F)
198940.0 C (104.0 F)
199035.6 C (96.1 F)
199140.0 C (104.0 F)
199236.7 C (98.1 F)
199333.3 C (91.9 F)
199433.9 C (93.0 F)
199536.7 C (98.1 F)
199634.4 C (93.9 F)
199735.0 C (95.0 F)
199836.7 C (98.1 F)
199936.1 C (97.0 F)
200038.3 C (100.9 F)
200136.7 C (98.1 F)
200241.7 C (107.1 F)
200342.8 C (109.0 F)
200433.9 C (93.0 F)
200539.4 C (102.9 F)
200645.0 C (113.0 F)
200740.0 C (104.0 F)
200833.9 C (93.0 F)
200935.6 C (96.1 F)
201036.1 C (97.0 F)
201137.2 C (99.0 F)
201237.8 C (100.0 F)
201336.1 C (97.0 F)
201433.3 C (91.9 F)
201536.7 C (98.1 F)
201635.6 C (96.1 F)
201717.8 C (64.0 F)

Coldest night (TNn)

Coldest night (TNn) at Mellette 4 W by year The coldest night of the year at Mellette 4 W, 1893 to 2017. The record is -42.8 C (-45.0 F) in 1912, marked on the chart; the median year is -33.9 C (-29.0 F). -50-40-30-20-100190019201940196019802000Record: -42.8 C (-45.0 F) in 1912
The coldest night of the year at Mellette 4 W, 1893 to 2017. The record is -42.8 C (-45.0 F) in 1912, marked on the chart; the median year is -33.9 C (-29.0 F).
Coldest night (TNn) at Mellette 4 W by year
YearColdest night (TNn)
1893n/a
1894n/a
1895-2.8 C (27.0 F)
1896-30.6 C (-23.1 F)
1897-33.9 C (-29.0 F)
1898-25.6 C (-14.1 F)
1899-39.4 C (-38.9 F)
1900-33.9 C (-29.0 F)
1901-30.6 C (-23.1 F)
1902-34.4 C (-29.9 F)
1903-34.4 C (-29.9 F)
1904-37.2 C (-35.0 F)
1905-38.3 C (-36.9 F)
1906-35.6 C (-32.1 F)
1907-36.7 C (-34.1 F)
1908-30.0 C (-22.0 F)
1909-35.0 C (-31.0 F)
1910-32.2 C (-26.0 F)
1911-33.3 C (-27.9 F)
1912-42.8 C (-45.0 F)
1913-31.1 C (-24.0 F)
1914-35.6 C (-32.1 F)
1915-36.1 C (-33.0 F)
1916-40.0 C (-40.0 F)
1917-40.0 C (-40.0 F)
1918-35.6 C (-32.1 F)
1919-36.1 C (-33.0 F)
1920-32.8 C (-27.0 F)
1921-29.4 C (-20.9 F)
1922-35.6 C (-32.1 F)
1923-30.0 C (-22.0 F)
1924-37.2 C (-35.0 F)
1925-30.0 C (-22.0 F)
1926-33.3 C (-27.9 F)
1927-34.4 C (-29.9 F)
1928-35.0 C (-31.0 F)
1929-38.3 C (-36.9 F)
1930-35.6 C (-32.1 F)
1931-26.1 C (-15.0 F)
1932-35.0 C (-31.0 F)
1933-35.0 C (-31.0 F)
1934-26.7 C (-16.1 F)
1935-32.8 C (-27.0 F)
1936-42.2 C (-44.0 F)
1937-33.3 C (-27.9 F)
1938-33.3 C (-27.9 F)
1939-36.7 C (-34.1 F)
1940-32.8 C (-27.0 F)
1941-30.0 C (-22.0 F)
1942-35.0 C (-31.0 F)
1943-40.6 C (-41.1 F)
1944-32.8 C (-27.0 F)
1945-31.1 C (-24.0 F)
1946-30.0 C (-22.0 F)
1947-30.6 C (-23.1 F)
1948-35.6 C (-32.1 F)
1949-34.4 C (-29.9 F)
1950-35.6 C (-32.1 F)
1951-36.1 C (-33.0 F)
1952-31.7 C (-25.1 F)
1953-34.4 C (-29.9 F)
1954-34.4 C (-29.9 F)
1955-32.8 C (-27.0 F)
1956-37.8 C (-36.0 F)
1957-31.1 C (-24.0 F)
1958-34.4 C (-29.9 F)
1959-35.0 C (-31.0 F)
1960-34.4 C (-29.9 F)
1961-34.4 C (-29.9 F)
1962-33.3 C (-27.9 F)
1963-35.6 C (-32.1 F)
1964-32.8 C (-27.0 F)
1965-34.4 C (-29.9 F)
1966-35.6 C (-32.1 F)
1967-38.3 C (-36.9 F)
1968-36.7 C (-34.1 F)
1969-26.1 C (-15.0 F)
1970-37.2 C (-35.0 F)
1971-36.7 C (-34.1 F)
1972-39.4 C (-38.9 F)
1973-31.7 C (-25.1 F)
1974-20.0 C (-4.0 F)
1975-31.7 C (-25.1 F)
1976-33.3 C (-27.9 F)
1977-34.4 C (-29.9 F)
1978-35.6 C (-32.1 F)
1979-32.8 C (-27.0 F)
1980-28.9 C (-20.0 F)
1981-35.6 C (-32.1 F)
1982-36.1 C (-33.0 F)
1983-38.9 C (-38.0 F)
1984-33.3 C (-27.9 F)
1985-32.8 C (-27.0 F)
1986-31.7 C (-25.1 F)
1987-27.2 C (-17.0 F)
1988-37.8 C (-36.0 F)
1989-33.9 C (-29.0 F)
1990-37.2 C (-35.0 F)
1991-29.4 C (-20.9 F)
1992-27.2 C (-17.0 F)
1993-31.7 C (-25.1 F)
1994-42.8 C (-45.0 F)
1995-32.2 C (-26.0 F)
1996-37.8 C (-36.0 F)
1997-35.6 C (-32.1 F)
1998-35.6 C (-32.1 F)
1999-31.7 C (-25.1 F)
2000-32.2 C (-26.0 F)
2001-32.2 C (-26.0 F)
2002-23.9 C (-11.0 F)
2003-30.6 C (-23.1 F)
2004-31.7 C (-25.1 F)
2005-35.6 C (-32.1 F)
2006-25.0 C (-13.0 F)
2007-33.3 C (-27.9 F)
2008-32.2 C (-26.0 F)
2009-35.6 C (-32.1 F)
2010-33.9 C (-29.0 F)
2011-31.7 C (-25.1 F)
2012-25.6 C (-14.1 F)
2013-32.2 C (-26.0 F)
2014-31.7 C (-25.1 F)
2015-28.9 C (-20.0 F)
2016-40.6 C (-41.1 F)
2017-28.3 C (-18.9 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Mellette 4 W by year The wettest day of the year at Mellette 4 W, 1893 to 2017. The record is 171.5 mm (6.8 in) in 2007, marked on the chart; the median year is 49.0 mm (1.9 in). 050100150200190019201940196019802000Record: 171.5 mm (6.8 in) in 2007
The wettest day of the year at Mellette 4 W, 1893 to 2017. The record is 171.5 mm (6.8 in) in 2007, marked on the chart; the median year is 49.0 mm (1.9 in).
Wettest day (Rx1day) at Mellette 4 W by year
YearWettest day (Rx1day)
189374.9 mm (2.9 in)
189467.3 mm (2.6 in)
189575.7 mm (3.0 in)
189634.8 mm (1.4 in)
189752.1 mm (2.1 in)
189896.5 mm (3.8 in)
189943.9 mm (1.7 in)
190090.7 mm (3.6 in)
190138.1 mm (1.5 in)
190262.2 mm (2.4 in)
190323.1 mm (0.9 in)
190457.4 mm (2.3 in)
190539.4 mm (1.6 in)
190662.2 mm (2.4 in)
190739.6 mm (1.6 in)
190886.6 mm (3.4 in)
190970.6 mm (2.8 in)
191030.0 mm (1.2 in)
191150.8 mm (2.0 in)
191272.4 mm (2.9 in)
191332.3 mm (1.3 in)
191452.6 mm (2.1 in)
191530.7 mm (1.2 in)
191646.5 mm (1.8 in)
191745.7 mm (1.8 in)
191852.1 mm (2.1 in)
191978.7 mm (3.1 in)
192040.6 mm (1.6 in)
192158.4 mm (2.3 in)
192281.3 mm (3.2 in)
192340.1 mm (1.6 in)
192435.6 mm (1.4 in)
192561.5 mm (2.4 in)
1926139.7 mm (5.5 in)
192744.7 mm (1.8 in)
192830.5 mm (1.2 in)
192943.4 mm (1.7 in)
193048.5 mm (1.9 in)
193135.6 mm (1.4 in)
193243.9 mm (1.7 in)
193339.1 mm (1.5 in)
193425.9 mm (1.0 in)
193599.1 mm (3.9 in)
193630.2 mm (1.2 in)
193752.3 mm (2.1 in)
193836.1 mm (1.4 in)
193956.6 mm (2.2 in)
194036.8 mm (1.4 in)
194185.1 mm (3.4 in)
194231.5 mm (1.2 in)
194326.7 mm (1.1 in)
194436.8 mm (1.4 in)
194562.2 mm (2.4 in)
194662.7 mm (2.5 in)
194746.2 mm (1.8 in)
194827.7 mm (1.1 in)
194949.0 mm (1.9 in)
195069.9 mm (2.8 in)
195146.0 mm (1.8 in)
195257.2 mm (2.3 in)
195363.0 mm (2.5 in)
195452.8 mm (2.1 in)
195537.3 mm (1.5 in)
195643.2 mm (1.7 in)
195750.0 mm (2.0 in)
195832.5 mm (1.3 in)
195935.6 mm (1.4 in)
196042.2 mm (1.7 in)
196160.2 mm (2.4 in)
196249.3 mm (1.9 in)
196392.7 mm (3.6 in)
196479.2 mm (3.1 in)
196554.4 mm (2.1 in)
196677.2 mm (3.0 in)
196757.9 mm (2.3 in)
196842.4 mm (1.7 in)
196955.1 mm (2.2 in)
197049.3 mm (1.9 in)
197150.0 mm (2.0 in)
197239.4 mm (1.6 in)
197317.8 mm (0.7 in)
197418.3 mm (0.7 in)
197530.0 mm (1.2 in)
197630.0 mm (1.2 in)
197746.2 mm (1.8 in)
197863.5 mm (2.5 in)
197981.3 mm (3.2 in)
198035.1 mm (1.4 in)
198161.2 mm (2.4 in)
198242.9 mm (1.7 in)
198377.0 mm (3.0 in)
1984116.6 mm (4.6 in)
198565.5 mm (2.6 in)
198692.2 mm (3.6 in)
198727.9 mm (1.1 in)
198840.6 mm (1.6 in)
198986.6 mm (3.4 in)
199075.9 mm (3.0 in)
199192.2 mm (3.6 in)
199292.5 mm (3.6 in)
199339.4 mm (1.6 in)
199452.1 mm (2.1 in)
199553.1 mm (2.1 in)
199646.7 mm (1.8 in)
199737.8 mm (1.5 in)
199889.4 mm (3.5 in)
199930.0 mm (1.2 in)
200048.3 mm (1.9 in)
200137.3 mm (1.5 in)
200242.9 mm (1.7 in)
200333.0 mm (1.3 in)
200439.6 mm (1.6 in)
200577.2 mm (3.0 in)
200640.6 mm (1.6 in)
2007171.5 mm (6.8 in)
200835.6 mm (1.4 in)
200977.5 mm (3.1 in)
201047.8 mm (1.9 in)
201140.6 mm (1.6 in)
201257.4 mm (2.3 in)
201355.9 mm (2.2 in)
201430.0 mm (1.2 in)
201557.4 mm (2.3 in)
201653.3 mm (2.1 in)
201712.7 mm (0.5 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Mellette 4 W by year The wettest five days of the year at Mellette 4 W, 1893 to 2017. The record is 207.0 mm (8.1 in) in 2007, marked on the chart; the median year is 73.6 mm (2.9 in). 050100150200250190019201940196019802000Record: 207.0 mm (8.1 in) in 2007
The wettest five days of the year at Mellette 4 W, 1893 to 2017. The record is 207.0 mm (8.1 in) in 2007, marked on the chart; the median year is 73.6 mm (2.9 in).
Wettest five days (Rx5day) at Mellette 4 W by year
YearWettest five days (Rx5day)
1893110.5 mm (4.4 in)
189469.8 mm (2.7 in)
189590.2 mm (3.6 in)
189656.9 mm (2.2 in)
189770.4 mm (2.8 in)
1898110.5 mm (4.4 in)
189980.3 mm (3.2 in)
190097.3 mm (3.8 in)
190176.2 mm (3.0 in)
190270.3 mm (2.8 in)
190358.4 mm (2.3 in)
190464.3 mm (2.5 in)
190569.1 mm (2.7 in)
1906148.1 mm (5.8 in)
190775.9 mm (3.0 in)
190890.4 mm (3.6 in)
190981.8 mm (3.2 in)
191053.9 mm (2.1 in)
191169.4 mm (2.7 in)
191283.3 mm (3.3 in)
191357.0 mm (2.2 in)
191478.7 mm (3.1 in)
191552.3 mm (2.1 in)
191685.9 mm (3.4 in)
191763.4 mm (2.5 in)
191864.0 mm (2.5 in)
191978.7 mm (3.1 in)
192061.7 mm (2.4 in)
192175.2 mm (3.0 in)
192298.5 mm (3.9 in)
192350.0 mm (2.0 in)
192460.2 mm (2.4 in)
1925127.4 mm (5.0 in)
1926145.2 mm (5.7 in)
192758.4 mm (2.3 in)
192837.3 mm (1.5 in)
192950.3 mm (2.0 in)
193062.6 mm (2.5 in)
193138.6 mm (1.5 in)
193250.5 mm (2.0 in)
193339.1 mm (1.5 in)
193460.0 mm (2.4 in)
1935113.5 mm (4.5 in)
193655.9 mm (2.2 in)
193756.4 mm (2.2 in)
193853.4 mm (2.1 in)
193958.9 mm (2.3 in)
194043.9 mm (1.7 in)
1941103.2 mm (4.1 in)
194274.2 mm (2.9 in)
194364.8 mm (2.6 in)
194447.0 mm (1.9 in)
194591.2 mm (3.6 in)
194697.7 mm (3.8 in)
194754.5 mm (2.1 in)
194867.3 mm (2.6 in)
194956.6 mm (2.2 in)
195091.3 mm (3.6 in)
1951102.6 mm (4.0 in)
1952114.6 mm (4.5 in)
1953106.7 mm (4.2 in)
195456.9 mm (2.2 in)
195564.8 mm (2.6 in)
195649.6 mm (2.0 in)
195779.2 mm (3.1 in)
195842.5 mm (1.7 in)
195962.2 mm (2.4 in)
196054.7 mm (2.2 in)
196193.0 mm (3.7 in)
196292.0 mm (3.6 in)
196392.7 mm (3.6 in)
196480.7 mm (3.2 in)
196588.8 mm (3.5 in)
196698.5 mm (3.9 in)
196774.4 mm (2.9 in)
1968108.4 mm (4.3 in)
196955.1 mm (2.2 in)
1970106.0 mm (4.2 in)
197180.5 mm (3.2 in)
197254.6 mm (2.1 in)
197341.1 mm (1.6 in)
197421.1 mm (0.8 in)
197551.1 mm (2.0 in)
197639.4 mm (1.6 in)
197780.6 mm (3.2 in)
197884.9 mm (3.3 in)
1979102.9 mm (4.1 in)
198078.3 mm (3.1 in)
198168.1 mm (2.7 in)
198291.4 mm (3.6 in)
198383.4 mm (3.3 in)
1984118.2 mm (4.7 in)
198570.9 mm (2.8 in)
1986101.1 mm (4.0 in)
198744.3 mm (1.7 in)
198894.0 mm (3.7 in)
198987.2 mm (3.4 in)
199093.5 mm (3.7 in)
199193.0 mm (3.7 in)
1992114.8 mm (4.5 in)
199394.5 mm (3.7 in)
199499.8 mm (3.9 in)
199569.5 mm (2.7 in)
199695.8 mm (3.8 in)
199773.6 mm (2.9 in)
1998106.5 mm (4.2 in)
199965.5 mm (2.6 in)
200069.4 mm (2.7 in)
200150.0 mm (2.0 in)
200259.2 mm (2.3 in)
200385.8 mm (3.4 in)
200451.1 mm (2.0 in)
2005105.8 mm (4.2 in)
200648.0 mm (1.9 in)
2007207.0 mm (8.1 in)
200868.5 mm (2.7 in)
200994.8 mm (3.7 in)
201082.4 mm (3.2 in)
201163.9 mm (2.5 in)
201264.3 mm (2.5 in)
201383.1 mm (3.3 in)
201463.3 mm (2.5 in)
2015101.4 mm (4.0 in)
201661.9 mm (2.4 in)
201714.2 mm (0.6 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Mellette 4 W by year The longest dry spell of the year at Mellette 4 W, 1893 to 2017. The record is 78 days in 1952, marked on the chart; the median year is 33 days. 020406080190019201940196019802000Record: 78 days in 1952
The longest dry spell of the year at Mellette 4 W, 1893 to 2017. The record is 78 days in 1952, marked on the chart; the median year is 33 days.
Longest dry spell (CDD) at Mellette 4 W by year
YearLongest dry spell (CDD)
189337 days
189425 days
189523 days
189629 days
189731 days
189865 days
189939 days
190041 days
190137 days
190231 days
190339 days
190458 days
190563 days
190639 days
190758 days
190830 days
190933 days
191040 days
191137 days
191254 days
191329 days
191445 days
191534 days
191632 days
191761 days
191822 days
191945 days
192041 days
192136 days
192227 days
192336 days
192433 days
192529 days
192633 days
192729 days
192864 days
192923 days
193031 days
193132 days
193228 days
193337 days
193449 days
193535 days
193643 days
193735 days
193828 days
193972 days
194029 days
194135 days
194246 days
194336 days
194433 days
194526 days
194629 days
194723 days
194835 days
194959 days
195025 days
195133 days
195278 days
195325 days
195430 days
195543 days
195640 days
195729 days
195844 days
195954 days
196029 days
196139 days
196229 days
196328 days
196433 days
196537 days
196635 days
196734 days
196837 days
196920 days
197029 days
197170 days
197224 days
197323 days
197448 days
197524 days
197642 days
197735 days
197837 days
197961 days
198069 days
198155 days
198230 days
198318 days
198428 days
198536 days
198643 days
198735 days
198827 days
198920 days
199029 days
199148 days
199224 days
199323 days
199433 days
199523 days
199633 days
199728 days
199840 days
199945 days
200043 days
200136 days
200247 days
200322 days
200423 days
200526 days
200629 days
200730 days
200823 days
200925 days
201029 days
201139 days
201254 days
201327 days
201424 days
201525 days
201619 days
201718 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

101 years with a frost

Across 101 years with a frost, the median last spring frost at Mellette 4 W falls on 15 May and the median first autumn frost on 22 September, which leaves a median of 131 days between them.

In 1985 to 2016 the median growing season was 142 days. That is 14 days more than in 1897 to 1932.

Fitted over all years, the growing season changes by +1.8 days per decade at this station.

Frost dates and growing season at Mellette 4 W
MeasureMedian, all yearsEarliest period (1897 to 1932)Recent period (1985 to 2016)Recent against earliestFitted trend
Last spring frost15 May18 May12 May6 days earlier-1.0 days per decade
First autumn frost22 September21 September27 September6 days later+0.8 days per decade
Growing days131 days128 days142 days14 days more+1.8 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

112 years, 1897 to 2016

A day with at least 48.9 mm (1.9 in) of rain is expected about once in 2 years. A day with at least 142.0 mm (5.6 in) of rain is expected about once in 100 years.

Rainfall return levels at Mellette 4 W: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years48.9 mm (1.9 in)
5 years68.4 mm (2.7 in)
10 years83.2 mm (3.3 in)
25 years104.5 mm (4.1 in)
50 years122.4 mm (4.8 in)
100 years142.0 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, 112 years of values from 1897 to 2016.

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: 171.5 mm (6.8 in) in 2007; 139.7 mm (5.5 in) in 1926; 116.6 mm (4.6 in) in 1984.

Download the Data

  • Data for Mellette 4 W standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Mellette 4 W 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2025-12-31).