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Winona Dam 5 A Weather Records (USC00219072)

Record envelope, standing records and threshold days for Winona Dam 5 A (USC00219072), Minnesota, United States, with 88 years of record.

Key Facts for Winona Dam 5 A

  • Winona Dam 5 A (USC00219072) is a weather station in Minnesota, United States at 44.09 latitude and -91.67 longitude, 202 m (663 ft) above sea level.
  • The station reports from 1939 to 2026, 88 years of record.
  • 1,464 records set at Winona Dam 5 A still stand.
  • Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Winona Dam 5 A set a daily record high minimum temperature of 18.3 C (64.9 F) on 12 October 2026 (provisional).

Provisional Records

Records set in the last 60 days are provisional until they clear the revision window.

About the Station

  • Location: Minnesota, United States, 44.09 latitude, -91.67 longitude.
  • Elevation: 202 m (663 ft).
  • Period of record: 1939 to 2026, 88 years.
  • Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

14 days at or beyond a record
Daily record high and record low at Winona Dam 5 A, with 2026 drawn through them The band shows the record high and record low for each calendar day at Winona Dam 5 A. The lines show the 2026 daily maximum and minimum. 14 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -40-200204060 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Winona Dam 5 A. The lines show the 2026 daily maximum and minimum. 14 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Winona Dam 5 A, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan14.4 C (57.9 F)-35.6 C (-32.1 F)7.2 C (45.0 F)-28.3 C (-18.9 F)
Feb21.1 C (70.0 F)-38.9 C (-38.0 F)12.8 C (55.0 F)-17.2 C (1.0 F)
Mar31.1 C (88.0 F)-30.0 C (-22.0 F)26.1 C (79.0 F)-15.6 C (3.9 F)
Apr33.9 C (93.0 F)-13.3 C (8.1 F)26.7 C (80.1 F)-3.9 C (25.0 F)
May34.4 C (93.9 F)-2.2 C (28.0 F)32.2 C (90.0 F)1.1 C (34.0 F)
Jun36.7 C (98.1 F)4.4 C (39.9 F)33.3 C (91.9 F)10.6 C (51.1 F)
Jul42.2 C (108.0 F)8.9 C (48.0 F)33.3 C (91.9 F)12.2 C (54.0 F)
Aug38.9 C (102.0 F)6.7 C (44.1 F)30.6 C (87.1 F)12.2 C (54.0 F)
Sep36.7 C (98.1 F)-2.2 C (28.0 F)33.3 C (91.9 F)8.3 C (46.9 F)
Oct31.7 C (89.1 F)-6.7 C (19.9 F)31.1 C (88.0 F)7.2 C (45.0 F)
Nov25.6 C (78.1 F)-18.9 C (-2.0 F)n/an/a
Dec19.4 C (66.9 F)-35.0 C (-31.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Winona Dam 5 A by the year they were set 1,464 records at Winona Dam 5 A still stand. 2000 holds the most, with 62. 0204060801939: 191940: 531941: 401942: 451943: 301944: 81949: 91967: 11968: 91969: 11970: 111971: 241972: 11973: 31974: 191975: 51976: 111977: 31980: 91981: 51991: 311992: 451993: 381994: 421995: 471996: 421997: 341998: 361999: 322000: 622001: 302002: 262003: 292004: 312005: 352006: 262007: 282008: 252009: 352010: 252011: 202012: 372013: 372014: 392015: 302016: 222017: 362018: 292019: 202020: 362021: 362022: 232023: 322024: 282025: 192026: 151939194919721980199520012007201320192025
1,464 records at Winona Dam 5 A still stand. 2000 holds the most, with 62.
Standing records at Winona Dam 5 A by the year they were set
Year setStanding records
193919
194053
194140
194245
194330
19448
19499
19671
19689
19691
197011
197124
19721
19733
197419
19755
197611
19773
19809
19815
199131
199245
199338
199442
199547
199642
199734
199836
199932
200062
200130
200226
200329
200431
200535
200626
200728
200825
200935
201025
201120
201237
201337
201439
201530
201622
201736
201829
201920
202036
202136
202223
202332
202428
202519
202615

All-Time Record Progression

7 new records
When Winona Dam 5 A set new all-time records 7 all-time records were set at Winona Dam 5 A between 1 July 1978 and 29 July 2011. Each dot is a new record. Record daily precipitationRecord snow depthRecord daily snowfall1 July 1978: Record daily precipitation 112.0 mm (4.4 in)24 January 1979: Record snow depth 73.7 cm (29.0 in)27 January 1979: Record snow depth 78.7 cm (31.0 in)24 April 1990: Record daily precipitation 138.2 mm (5.4 in)12 December 2010: Record daily snowfall 40.6 cm (16.0 in)25 December 2010: Record snow depth 81.3 cm (32.0 in)29 July 2011: Record daily precipitation 146.0 mm (5.7 in)1980198519901995200020052010
7 all-time records were set at Winona Dam 5 A between 1 July 1978 and 29 July 2011. Each dot is a new record.
When Winona Dam 5 A set new all-time records
DateKindDetail
1978-07-01Record daily precipitationRecord daily precipitation 112.0 mm (4.4 in)
1979-01-24Record snow depthRecord snow depth 73.7 cm (29.0 in)
1979-01-27Record snow depthRecord snow depth 78.7 cm (31.0 in)
1990-04-24Record daily precipitationRecord daily precipitation 138.2 mm (5.4 in)
2010-12-12Record daily snowfallRecord daily snowfall 40.6 cm (16.0 in)
2010-12-25Record snow depthRecord snow depth 81.3 cm (32.0 in)
2011-07-29Record daily precipitationRecord daily precipitation 146.0 mm (5.7 in)

Wettest Day of Each Month

Jul: 146.0 mm (5.7 in)
Record daily precipitation for each month at Winona Dam 5 A The wettest day on record for each calendar month at Winona Dam 5 A. The most was 146.0 mm (5.7 in) on 29 July 2011. 050100150 Jan: 38.1 mm (1.5 in), 6 January 1946 Jan Feb: 37.1 mm (1.5 in), 27 February 1998 Feb Mar: 54.9 mm (2.2 in), 16 March 2016 Mar Apr: 138.2 mm (5.4 in), 24 April 1990 Apr May: 78.7 mm (3.1 in), 31 May 1980 May Jun: 95.3 mm (3.8 in), 29 June 1942 Jun Jul: 146.0 mm (5.7 in), 29 July 2011 Jul Aug: 129.5 mm (5.1 in), 19 August 2007 Aug Sep: 126.5 mm (5.0 in), 15 September 2004 Sep Oct: 105.9 mm (4.2 in), 25 October 2023 Oct Nov: 66.0 mm (2.6 in), 2 November 1991 Nov Dec: 31.2 mm (1.2 in), 28 December 1982 Dec
The wettest day on record for each calendar month at Winona Dam 5 A. The most was 146.0 mm (5.7 in) on 29 July 2011.
Record daily precipitation for each month at Winona Dam 5 A
MonthRecord daily precipitation (mm)Date
Jan38.1 mm (1.5 in)6 January 1946
Feb37.1 mm (1.5 in)27 February 1998
Mar54.9 mm (2.2 in)16 March 2016
Apr138.2 mm (5.4 in)24 April 1990
May78.7 mm (3.1 in)31 May 1980
Jun95.3 mm (3.8 in)29 June 1942
Jul146.0 mm (5.7 in)29 July 2011
Aug129.5 mm (5.1 in)19 August 2007
Sep126.5 mm (5.0 in)15 September 2004
Oct105.9 mm (4.2 in)25 October 2023
Nov66.0 mm (2.6 in)2 November 1991
Dec31.2 mm (1.2 in)28 December 1982

Period of Record Coverage

1939 to 2026
Days with data per year at Winona Dam 5 A 56 years of record at Winona Dam 5 A, 1939 to 2026. 18 years have data for under 90 percent of days and are left out of rankings: 1939, 1944, 1949, 1967, 1968, 1969, 1970, 1971 and others. 1939: 122 of 365 days1940: 362 of 366 days1941: 361 of 365 days1942: 362 of 365 days1943: 360 of 365 days1944: 87 of 366 days1949: 31 of 365 days1967: 15 of 365 days1968: 60 of 366 days1969: 90 of 365 days1970: 92 of 365 days1971: 245 of 365 days1972: 29 of 366 days1973: 59 of 365 days1974: 149 of 365 days1975: 62 of 365 days1976: 87 of 366 days1977: 88 of 365 days1980: 29 of 366 days1981: 60 of 365 days1991: 212 of 365 days1992: 364 of 366 days1993: 363 of 365 days1994: 364 of 365 days1995: 363 of 365 days1996: 364 of 366 days1997: 362 of 365 days1998: 360 of 365 days1999: 364 of 365 days2000: 347 of 366 days2001: 365 of 365 days2002: 363 of 365 days2003: 365 of 365 days2004: 365 of 366 days2005: 353 of 365 days2006: 365 of 365 days2007: 365 of 365 days2008: 364 of 366 days2009: 356 of 365 days2010: 365 of 365 days2011: 364 of 365 days2012: 364 of 366 days2013: 363 of 365 days2014: 365 of 365 days2015: 363 of 365 days2016: 366 of 366 days2017: 365 of 365 days2018: 364 of 365 days2019: 362 of 365 days2020: 355 of 366 days2021: 354 of 365 days2022: 356 of 365 days2023: 356 of 365 days2024: 347 of 366 days2025: 361 of 365 days2026: 269 of 365 days194019701980200020102020
56 years of record at Winona Dam 5 A, 1939 to 2026. 18 years have data for under 90 percent of days and are left out of rankings: 1939, 1944, 1949, 1967, 1968, 1969, 1970, 1971 and others.
Days with data per year at Winona Dam 5 A
YearDays with dataShare of yearComplete
193912233%No
194036299%Yes
194136199%Yes
194236299%Yes
194336099%Yes
19448724%No
1949318%No
1967154%No
19686016%No
19699025%No
19709225%No
197124567%No
1972298%No
19735916%No
197414941%No
19756217%No
19768724%No
19778824%No
1980298%No
19816016%No
199121258%No
199236499%Yes
199336399%Yes
1994364100%Yes
199536399%Yes
199636499%Yes
199736299%Yes
199836099%Yes
1999364100%Yes
200034795%Yes
2001365100%Yes
200236399%Yes
2003365100%Yes
2004365100%Yes
200535397%Yes
2006365100%Yes
2007365100%Yes
200836499%Yes
200935698%Yes
2010365100%Yes
2011364100%Yes
201236499%Yes
201336399%Yes
2014365100%Yes
201536399%Yes
2016366100%Yes
2017365100%Yes
2018364100%Yes
201936299%Yes
202035597%Yes
202135497%Yes
202235698%Yes
202335698%Yes
202434795%Yes
202536199%Yes
202626974%No

Latest Records

20
Latest records at Winona Dam 5 A
DateStationRecordValueBeat old record byOld record stoodSignificance
12 October 2026Winona Dam 5 A, USdaily high min (Provisional)18.3 C (64.9 F)1.6 C (2.9 F)28 years19 of 100 (Routine)
12 October 2026Winona Dam 5 A, USdaily high max (Provisional)31.1 C (88.0 F)1.7 C (3.1 F)11 years13 of 100 (Routine)
11 October 2026Winona Dam 5 A, USdaily high min (Provisional)15.6 C (60.1 F)1.2 C (2.2 F)23 years16 of 100 (Routine)
11 October 2026Winona Dam 5 A, USdaily high max (Provisional)30.6 C (87.1 F)3.4 C (6.1 F)4 years14 of 100 (Routine)
1 September 2026Winona Dam 5 A, USdaily high min (Tie, Provisional)21.7 C (71.1 F)tie84 years8 of 100 (Routine)
23 July 2026Winona Dam 5 A, USdaily low min (Tie)12.2 C (54.0 F)tie33 years4 of 100 (Routine)
15 July 2026Winona Dam 5 A, USdaily high min (Tie)21.1 C (70.0 F)tie31 years4 of 100 (Routine)
2 July 2026Winona Dam 5 A, USdaily rain76.2 mm (3.0 in)21.1 mm (0.8 in)32 years31 of 100 (Routine)
30 June 2026Winona Dam 5 A, USdaily high min24.4 C (75.9 F)1.1 C (2.0 F)8 years12 of 100 (Routine)
24 June 2026Winona Dam 5 A, USdaily rain38.1 mm (1.5 in)5.1 mm (0.20 in)0 years12 of 100 (Routine)
18 June 2026Winona Dam 5 A, USdaily low max (Tie)18.9 C (66.0 F)tie29 years4 of 100 (Routine)
27 May 2026Winona Dam 5 A, USdaily high max (Tie)32.2 C (90.0 F)tie8 years2 of 100 (Routine)
26 May 2026Winona Dam 5 A, USdaily high max31.1 C (88.0 F)1.1 C (2.0 F)84 years34 of 100 (Routine)
8 May 2026Winona Dam 5 A, USdaily low min1.1 C (34.0 F)0.6 C (1.1 F)16 years13 of 100 (Routine)
7 May 2026Winona Dam 5 A, USdaily low max7.8 C (46.0 F)2.2 C (4.0 F)83 years35 of 100 (Notable)
7 May 2026Winona Dam 5 A, USdaily low min (Tie)1.1 C (34.0 F)tie32 years4 of 100 (Routine)
6 May 2026Winona Dam 5 A, USdaily low min1.1 C (34.0 F)1.1 C (2.0 F)32 years19 of 100 (Routine)
27 April 2026Winona Dam 5 A, USdaily high min12.8 C (55.0 F)1.1 C (2.0 F)84 years35 of 100 (Notable)
24 April 2026Winona Dam 5 A, USdaily high min11.1 C (52.0 F)0.5 C (0.9 F)4 years10 of 100 (Routine)
31 March 2026Winona Dam 5 A, USdaily high max26.1 C (79.0 F)3.3 C (5.9 F)27 years20 of 100 (Routine)

Climate Trend

36 complete years, 1940 to 2025
Annual mean temperature at Winona Dam 5 A as warming stripes, 1940 to 2025 One stripe for each of 36 complete years at Winona Dam 5 A, 1940 to 2025. Blue stripes are years cooler than the station's own mean of 8.3 C (46.9 F); red stripes are warmer. The coolest year was 2014, at 6.0 C (42.7 F), and the warmest was 2024, at 10.5 C (50.9 F). The strongest colour marks a difference of 2.4 C (4.3 F). 1940: 7.8 C, -0.5 C from the station mean1941: 9.6 C, +1.3 C from the station mean1942: 8.4 C, +0.1 C from the station mean1943: 7.5 C, -0.8 C from the station mean1992: 8.2 C, -0.1 C from the station mean1993: 6.6 C, -1.7 C from the station mean1994: 7.9 C, -0.4 C from the station mean1995: 7.8 C, -0.5 C from the station mean1996: 6.3 C, -1.9 C from the station mean1997: 7.5 C, -0.8 C from the station mean1998: 10.3 C, +2.0 C from the station mean1999: 9.4 C, +1.1 C from the station mean2001: 8.7 C, +0.5 C from the station mean2002: 8.8 C, +0.5 C from the station mean2003: 7.8 C, -0.5 C from the station mean2004: 8.2 C, -0.1 C from the station mean2006: 9.4 C, +1.2 C from the station mean2007: 8.1 C, -0.2 C from the station mean2008: 6.2 C, -2.1 C from the station mean2009: 7.2 C, -1.1 C from the station mean2010: 8.3 C, 0.0 C from the station mean2011: 8.2 C, -0.1 C from the station mean2012: 10.1 C, +1.8 C from the station mean2013: 6.7 C, -1.5 C from the station mean2014: 6.0 C, -2.3 C from the station mean2015: 8.8 C, +0.5 C from the station mean2016: 9.5 C, +1.2 C from the station mean2017: 8.8 C, +0.5 C from the station mean2018: 7.8 C, -0.4 C from the station mean2019: 7.1 C, -1.2 C from the station mean2020: 8.7 C, +0.4 C from the station mean2021: 9.4 C, +1.1 C from the station mean2022: 7.6 C, -0.7 C from the station mean2023: 9.8 C, +1.5 C from the station mean2024: 10.5 C, +2.2 C from the station mean2025: 9.0 C, +0.7 C from the station mean194019501960197019801990200020102020
One stripe for each of 36 complete years at Winona Dam 5 A, 1940 to 2025. Blue stripes are years cooler than the station's own mean of 8.3 C (46.9 F); red stripes are warmer. The coolest year was 2014, at 6.0 C (42.7 F), and the warmest was 2024, at 10.5 C (50.9 F). The strongest colour marks a difference of 2.4 C (4.3 F).
Annual mean temperature at Winona Dam 5 A as warming stripes, 1940 to 2025
YearAnnual mean temperatureDifference from the station mean
19407.8 C-0.47 C
19419.6 C+1.29 C
19428.4 C+0.11 C
19437.5 C-0.80 C
19928.2 C-0.07 C
19936.6 C-1.70 C
19947.9 C-0.37 C
19957.8 C-0.50 C
19966.3 C-1.94 C
19977.5 C-0.75 C
199810.3 C+2.05 C
19999.4 C+1.14 C
20018.7 C+0.46 C
20028.8 C+0.49 C
20037.8 C-0.45 C
20048.2 C-0.12 C
20069.4 C+1.17 C
20078.1 C-0.18 C
20086.2 C-2.10 C
20097.2 C-1.05 C
20108.3 C+0.02 C
20118.2 C-0.10 C
201210.1 C+1.84 C
20136.7 C-1.53 C
20146.0 C-2.30 C
20158.8 C+0.52 C
20169.5 C+1.25 C
20178.8 C+0.53 C
20187.8 C-0.43 C
20197.1 C-1.19 C
20208.7 C+0.43 C
20219.4 C+1.12 C
20227.6 C-0.72 C
20239.8 C+1.55 C
202410.5 C+2.21 C
20259.0 C+0.75 C

The fitted trend in annual mean temperature here over 1940 to 2025 is 0.05 C (-0.12 to 0.22) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.2 to 0.4) per decade. The slope is a straight line fitted to 36 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Winona Dam 5 A
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.05 C (-0.12 to 0.22) per decade0.1 F (-0.2 to 0.4) per decade1940 to 202536Not clearly different from zero
Mean daily maximum0.1 C (-0.1 to 0.3) per decade0.2 F (-0.2 to 0.5) per decade1940 to 202536Not clearly different from zero
Mean daily minimum0.01 C (-0.18 to 0.19) per decade0.01 F (-0.32 to 0.34) per decade1940 to 202536Not 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

1939 to 2026
Yearly extremes at Winona Dam 5 A: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)42.2 C (108.0 F)199534.7 C (94.5 F)56
Coldest night (TNn)-38.9 C (-38.0 F)1996-26.4 C (-15.5 F)56
Wettest day (Rx1day)146.0 mm (5.7 in)201155.6 mm (2.2 in)88
Wettest five days (Rx5day)164.8 mm (6.5 in)198087.7 mm (3.5 in)88
Longest dry spell (CDD)52 days194323 days88

Hottest day (TXx)

Hottest day (TXx) at Winona Dam 5 A by year The hottest day of the year at Winona Dam 5 A, 1939 to 2026. The record is 42.2 C (108.0 F) in 1995, marked on the chart; the median year is 34.7 C (94.5 F). 0102030405019401960198020002020Record: 42.2 C (108.0 F) in 1995
The hottest day of the year at Winona Dam 5 A, 1939 to 2026. The record is 42.2 C (108.0 F) in 1995, marked on the chart; the median year is 34.7 C (94.5 F).
Hottest day (TXx) at Winona Dam 5 A by year
YearHottest day (TXx)
193935.0 C (95.0 F)
194037.2 C (99.0 F)
194135.6 C (96.1 F)
194235.0 C (95.0 F)
194334.4 C (93.9 F)
194414.4 C (57.9 F)
1945n/a
1946n/a
1947n/a
1948n/a
194936.7 C (98.1 F)
1950n/a
1951n/a
1952n/a
1953n/a
1954n/a
1955n/a
1956n/a
1957n/a
1958n/a
1959n/a
1960n/a
1961n/a
1962n/a
1963n/a
1964n/a
1965n/a
1966n/a
196724.4 C (75.9 F)
196834.4 C (93.9 F)
196930.0 C (86.0 F)
197033.9 C (93.0 F)
197135.6 C (96.1 F)
19727.8 C (46.0 F)
197310.6 C (51.1 F)
197431.1 C (88.0 F)
19759.4 C (48.9 F)
197638.3 C (100.9 F)
197728.3 C (82.9 F)
1978n/a
1979n/a
198033.9 C (93.0 F)
198125.6 C (78.1 F)
1982n/a
1983n/a
1984n/a
1985n/a
1986n/a
1987n/a
1988n/a
1989n/a
1990n/a
199136.1 C (97.0 F)
199233.3 C (91.9 F)
199333.9 C (93.0 F)
199434.4 C (93.9 F)
199542.2 C (108.0 F)
199636.7 C (98.1 F)
199735.6 C (96.1 F)
199836.7 C (98.1 F)
199937.8 C (100.0 F)
200036.7 C (98.1 F)
200136.1 C (97.0 F)
200237.2 C (99.0 F)
200335.6 C (96.1 F)
200433.3 C (91.9 F)
200537.2 C (99.0 F)
200637.2 C (99.0 F)
200733.3 C (91.9 F)
200831.7 C (89.1 F)
200934.4 C (93.9 F)
201036.1 C (97.0 F)
201136.7 C (98.1 F)
201237.8 C (100.0 F)
201335.0 C (95.0 F)
201431.1 C (88.0 F)
201533.9 C (93.0 F)
201635.0 C (95.0 F)
201733.9 C (93.0 F)
201834.4 C (93.9 F)
201933.9 C (93.0 F)
202034.4 C (93.9 F)
202135.6 C (96.1 F)
202236.1 C (97.0 F)
202338.9 C (102.0 F)
202433.3 C (91.9 F)
202535.0 C (95.0 F)
202633.3 C (91.9 F)

Coldest night (TNn)

Coldest night (TNn) at Winona Dam 5 A by year The coldest night of the year at Winona Dam 5 A, 1939 to 2026. The record is -38.9 C (-38.0 F) in 1996, marked on the chart; the median year is -26.4 C (-15.5 F). -40-2002019401960198020002020Record: -38.9 C (-38.0 F) in 1996
The coldest night of the year at Winona Dam 5 A, 1939 to 2026. The record is -38.9 C (-38.0 F) in 1996, marked on the chart; the median year is -26.4 C (-15.5 F).
Coldest night (TNn) at Winona Dam 5 A by year
YearColdest night (TNn)
1939-18.9 C (-2.0 F)
1940-27.2 C (-17.0 F)
1941-25.6 C (-14.1 F)
1942-27.2 C (-17.0 F)
1943-32.2 C (-26.0 F)
1944-24.4 C (-11.9 F)
1945n/a
1946n/a
1947n/a
1948n/a
194912.2 C (54.0 F)
1950n/a
1951n/a
1952n/a
1953n/a
1954n/a
1955n/a
1956n/a
1957n/a
1958n/a
1959n/a
1960n/a
1961n/a
1962n/a
1963n/a
1964n/a
1965n/a
1966n/a
1967-4.4 C (24.1 F)
19682.2 C (36.0 F)
1969-18.9 C (-2.0 F)
1970-12.8 C (9.0 F)
1971-16.7 C (1.9 F)
1972-27.8 C (-18.0 F)
1973-25.0 C (-13.0 F)
1974-28.9 C (-20.0 F)
1975-24.4 C (-11.9 F)
1976-1.1 C (30.0 F)
1977-26.7 C (-16.1 F)
1978n/a
1979n/a
1980-13.3 C (8.1 F)
1981-10.0 C (14.0 F)
1982n/a
1983n/a
1984n/a
1985n/a
1986n/a
1987n/a
1988n/a
1989n/a
1990n/a
1991-20.0 C (-4.0 F)
1992-23.3 C (-9.9 F)
1993-28.9 C (-20.0 F)
1994-34.4 C (-29.9 F)
1995-24.4 C (-11.9 F)
1996-38.9 C (-38.0 F)
1997-27.8 C (-18.0 F)
1998-22.2 C (-8.0 F)
1999-27.8 C (-18.0 F)
2000-35.0 C (-31.0 F)
2001-23.9 C (-11.0 F)
2002-21.1 C (-6.0 F)
2003-23.9 C (-11.0 F)
2004-28.9 C (-20.0 F)
2005-23.9 C (-11.0 F)
2006-28.3 C (-18.9 F)
2007-27.2 C (-17.0 F)
2008-29.4 C (-20.9 F)
2009-35.6 C (-32.1 F)
2010-27.2 C (-17.0 F)
2011-30.6 C (-23.1 F)
2012-23.9 C (-11.0 F)
2013-26.1 C (-15.0 F)
2014-30.0 C (-22.0 F)
2015-31.1 C (-24.0 F)
2016-30.6 C (-23.1 F)
2017-25.6 C (-14.1 F)
2018-25.6 C (-14.1 F)
2019-35.6 C (-32.1 F)
2020-29.4 C (-20.9 F)
2021-29.4 C (-20.9 F)
2022-28.9 C (-20.0 F)
2023-23.9 C (-11.0 F)
2024-22.2 C (-8.0 F)
2025-26.7 C (-16.1 F)
2026-28.3 C (-18.9 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Winona Dam 5 A by year The wettest day of the year at Winona Dam 5 A, 1939 to 2026. The record is 146.0 mm (5.7 in) in 2011, marked on the chart; the median year is 55.6 mm (2.2 in). 05010015019401960198020002020Record: 146.0 mm (5.7 in) in 2011
The wettest day of the year at Winona Dam 5 A, 1939 to 2026. The record is 146.0 mm (5.7 in) in 2011, marked on the chart; the median year is 55.6 mm (2.2 in).
Wettest day (Rx1day) at Winona Dam 5 A by year
YearWettest day (Rx1day)
193956.6 mm (2.2 in)
194033.0 mm (1.3 in)
194152.8 mm (2.1 in)
194295.3 mm (3.8 in)
194375.4 mm (3.0 in)
194434.8 mm (1.4 in)
194547.2 mm (1.9 in)
194656.1 mm (2.2 in)
194743.7 mm (1.7 in)
194855.1 mm (2.2 in)
194962.2 mm (2.4 in)
195050.3 mm (2.0 in)
195172.1 mm (2.8 in)
195252.1 mm (2.1 in)
195339.1 mm (1.5 in)
195445.7 mm (1.8 in)
195564.5 mm (2.5 in)
195644.2 mm (1.7 in)
195764.0 mm (2.5 in)
195835.1 mm (1.4 in)
195940.4 mm (1.6 in)
196041.4 mm (1.6 in)
196143.4 mm (1.7 in)
196247.5 mm (1.9 in)
196334.5 mm (1.4 in)
196481.8 mm (3.2 in)
196586.6 mm (3.4 in)
196648.0 mm (1.9 in)
196763.5 mm (2.5 in)
196868.8 mm (2.7 in)
196938.9 mm (1.5 in)
197050.8 mm (2.0 in)
197156.9 mm (2.2 in)
197260.5 mm (2.4 in)
197377.2 mm (3.0 in)
197439.9 mm (1.6 in)
197563.0 mm (2.5 in)
197638.1 mm (1.5 in)
197747.0 mm (1.9 in)
1978112.0 mm (4.4 in)
197937.1 mm (1.5 in)
198078.7 mm (3.1 in)
198154.9 mm (2.2 in)
198254.1 mm (2.1 in)
198356.1 mm (2.2 in)
198467.6 mm (2.7 in)
198532.3 mm (1.3 in)
198657.2 mm (2.3 in)
198732.0 mm (1.3 in)
198841.4 mm (1.6 in)
198947.5 mm (1.9 in)
1990138.2 mm (5.4 in)
199166.0 mm (2.6 in)
199241.7 mm (1.6 in)
199355.1 mm (2.2 in)
199468.3 mm (2.7 in)
199561.0 mm (2.4 in)
199636.6 mm (1.4 in)
199773.7 mm (2.9 in)
199876.2 mm (3.0 in)
199957.9 mm (2.3 in)
200054.1 mm (2.1 in)
200154.6 mm (2.1 in)
200248.3 mm (1.9 in)
200349.8 mm (2.0 in)
2004126.5 mm (5.0 in)
2005119.6 mm (4.7 in)
200630.0 mm (1.2 in)
2007129.5 mm (5.1 in)
200838.9 mm (1.5 in)
200956.4 mm (2.2 in)
201089.9 mm (3.5 in)
2011146.0 mm (5.7 in)
201244.5 mm (1.8 in)
201377.5 mm (3.1 in)
201446.7 mm (1.8 in)
201535.8 mm (1.4 in)
201663.8 mm (2.5 in)
2017114.3 mm (4.5 in)
201887.9 mm (3.5 in)
201948.3 mm (1.9 in)
202081.3 mm (3.2 in)
202168.8 mm (2.7 in)
202268.6 mm (2.7 in)
2023105.9 mm (4.2 in)
202471.9 mm (2.8 in)
202544.5 mm (1.8 in)
202676.2 mm (3.0 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Winona Dam 5 A by year The wettest five days of the year at Winona Dam 5 A, 1939 to 2026. The record is 164.8 mm (6.5 in) in 1980, marked on the chart; the median year is 87.7 mm (3.5 in). 05010015020019401960198020002020Record: 164.8 mm (6.5 in) in 1980
The wettest five days of the year at Winona Dam 5 A, 1939 to 2026. The record is 164.8 mm (6.5 in) in 1980, marked on the chart; the median year is 87.7 mm (3.5 in).
Wettest five days (Rx5day) at Winona Dam 5 A by year
YearWettest five days (Rx5day)
193997.2 mm (3.8 in)
194054.2 mm (2.1 in)
194182.3 mm (3.2 in)
1942123.5 mm (4.9 in)
1943107.2 mm (4.2 in)
194450.1 mm (2.0 in)
194596.0 mm (3.8 in)
194675.6 mm (3.0 in)
194790.6 mm (3.6 in)
194865.8 mm (2.6 in)
1949108.9 mm (4.3 in)
195071.1 mm (2.8 in)
195173.6 mm (2.9 in)
195281.1 mm (3.2 in)
195378.2 mm (3.1 in)
195483.3 mm (3.3 in)
195576.5 mm (3.0 in)
195667.6 mm (2.7 in)
195783.0 mm (3.3 in)
195850.2 mm (2.0 in)
195970.1 mm (2.8 in)
196081.5 mm (3.2 in)
196161.5 mm (2.4 in)
196284.6 mm (3.3 in)
196361.2 mm (2.4 in)
196499.8 mm (3.9 in)
1965125.2 mm (4.9 in)
196668.1 mm (2.7 in)
196778.3 mm (3.1 in)
196896.6 mm (3.8 in)
196985.0 mm (3.3 in)
197058.9 mm (2.3 in)
197164.8 mm (2.6 in)
1972128.3 mm (5.1 in)
1973104.2 mm (4.1 in)
197482.9 mm (3.3 in)
1975103.7 mm (4.1 in)
197656.6 mm (2.2 in)
197759.7 mm (2.4 in)
1978155.1 mm (6.1 in)
197987.7 mm (3.5 in)
1980164.8 mm (6.5 in)
1981118.2 mm (4.7 in)
198279.0 mm (3.1 in)
198374.4 mm (2.9 in)
198495.6 mm (3.8 in)
198548.3 mm (1.9 in)
198682.4 mm (3.2 in)
198750.6 mm (2.0 in)
198874.5 mm (2.9 in)
198988.7 mm (3.5 in)
1990158.3 mm (6.2 in)
1991148.3 mm (5.8 in)
199297.7 mm (3.8 in)
1993111.2 mm (4.4 in)
199491.9 mm (3.6 in)
199598.6 mm (3.9 in)
199651.4 mm (2.0 in)
199798.0 mm (3.9 in)
1998138.4 mm (5.4 in)
199980.5 mm (3.2 in)
2000116.8 mm (4.6 in)
2001108.9 mm (4.3 in)
200278.6 mm (3.1 in)
200357.9 mm (2.3 in)
2004133.6 mm (5.3 in)
2005119.6 mm (4.7 in)
200651.1 mm (2.0 in)
2007150.3 mm (5.9 in)
200899.3 mm (3.9 in)
200990.2 mm (3.6 in)
2010134.6 mm (5.3 in)
2011160.0 mm (6.3 in)
201266.0 mm (2.6 in)
2013119.7 mm (4.7 in)
201477.7 mm (3.1 in)
201570.4 mm (2.8 in)
2016103.2 mm (4.1 in)
2017140.0 mm (5.5 in)
2018128.6 mm (5.1 in)
2019105.7 mm (4.2 in)
202088.5 mm (3.5 in)
2021104.4 mm (4.1 in)
202282.0 mm (3.2 in)
2023149.4 mm (5.9 in)
202487.7 mm (3.5 in)
202583.0 mm (3.3 in)
2026126.7 mm (5.0 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Winona Dam 5 A by year The longest dry spell of the year at Winona Dam 5 A, 1939 to 2026. The record is 52 days in 1943, marked on the chart; the median year is 23 days. 10203040506019401960198020002020Record: 52 days in 1943
The longest dry spell of the year at Winona Dam 5 A, 1939 to 2026. The record is 52 days in 1943, marked on the chart; the median year is 23 days.
Longest dry spell (CDD) at Winona Dam 5 A by year
YearLongest dry spell (CDD)
193938 days
194017 days
194121 days
194238 days
194352 days
194426 days
194526 days
194628 days
194739 days
194834 days
194934 days
195024 days
195120 days
195230 days
195330 days
195423 days
195523 days
195621 days
195729 days
195826 days
195931 days
196026 days
196125 days
196248 days
196323 days
196439 days
196517 days
196625 days
196724 days
196836 days
196934 days
197031 days
197115 days
197224 days
197317 days
197413 days
197523 days
197639 days
197718 days
197820 days
197917 days
198031 days
198125 days
198223 days
198317 days
198421 days
198514 days
198622 days
198729 days
198822 days
198918 days
199014 days
199133 days
199218 days
199315 days
199420 days
199522 days
199615 days
199721 days
199839 days
199925 days
200028 days
200127 days
200236 days
200317 days
200423 days
200515 days
200622 days
200722 days
200816 days
200929 days
201029 days
201119 days
201224 days
201322 days
201417 days
201524 days
201619 days
201719 days
201820 days
201917 days
202028 days
202116 days
202216 days
202324 days
202434 days
202523 days
202616 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

36 years with a frost

Across 36 years with a frost, the median last spring frost at Winona Dam 5 A falls on 24 April and the median first autumn frost on 19 October, which leaves a median of 178 days between them.

Fitted over all years, the growing season changes by -0.5 days per decade at this station.

Frost dates and growing season at Winona Dam 5 A
MeasureMedian, all yearsEarliest periodRecent period (1994 to 2025)Recent against earliestFitted trend
Last spring frost24 Apriln/a24 Apriln/a+1.0 days per decade
First autumn frost19 Octobern/a19 Octobern/a+0.5 days per decade
Growing days178 daysn/a178 daysn/a-0.5 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

84 years, 1939 to 2025

A day with at least 56.0 mm (2.2 in) of rain is expected about once in 2 years. A day with at least 159.8 mm (6.3 in) of rain is expected about once in 100 years.

Rainfall return levels at Winona Dam 5 A: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years56.0 mm (2.2 in)
5 years77.4 mm (3.0 in)
10 years93.8 mm (3.7 in)
25 years117.5 mm (4.6 in)
50 years137.6 mm (5.4 in)
100 years159.8 mm (6.3 in)Longer than the 84 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 84 years of values from 1939 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: 146.0 mm (5.7 in) in 2011; 138.2 mm (5.4 in) in 1990; 129.5 mm (5.1 in) in 2007.

Download the Data

  • Data for Winona Dam 5 A standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Winona Dam 5 A 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 (2026-10-14).