Alma Dam 4 Weather Records (USC00470124)
Record envelope, standing records and threshold days for Alma Dam 4 (USC00470124), Wisconsin, United States, with 91 years of record.
Key Facts for Alma Dam 4
- Alma Dam 4 (USC00470124) is a weather station in Wisconsin, United States at 44.33 latitude and -91.92 longitude, 204 m (670 ft) above sea level.
- The station reports from 1936 to 2026, 91 years of record.
- 1,464 records set at Alma Dam 4 still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Alma Dam 4 set a daily record high maximum temperature of 29.4 C (84.9 F) on 13 October 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Wisconsin, United States, 44.33 latitude, -91.92 longitude.
- Elevation: 204 m (670 ft).
- Period of record: 1936 to 2026, 91 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
10 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 12.8 C (55.0 F) | -38.9 C (-38.0 F) | 7.2 C (45.0 F) | -28.9 C (-20.0 F) |
| Feb | 19.4 C (66.9 F) | -37.2 C (-35.0 F) | 13.3 C (55.9 F) | -16.7 C (1.9 F) |
| Mar | 26.7 C (80.1 F) | -32.8 C (-27.0 F) | 25.0 C (77.0 F) | -17.2 C (1.0 F) |
| Apr | 31.7 C (89.1 F) | -13.9 C (7.0 F) | 26.7 C (80.1 F) | -5.0 C (23.0 F) |
| May | 34.4 C (93.9 F) | -4.4 C (24.1 F) | 31.1 C (88.0 F) | 1.1 C (34.0 F) |
| Jun | 38.3 C (100.9 F) | 2.2 C (36.0 F) | 33.9 C (93.0 F) | 10.6 C (51.1 F) |
| Jul | 37.8 C (100.0 F) | 6.1 C (43.0 F) | 35.6 C (96.1 F) | 12.8 C (55.0 F) |
| Aug | 38.3 C (100.9 F) | 5.6 C (42.1 F) | 30.0 C (86.0 F) | 11.7 C (53.1 F) |
| Sep | 36.7 C (98.1 F) | -3.9 C (25.0 F) | 33.9 C (93.0 F) | 8.9 C (48.0 F) |
| Oct | 32.8 C (91.0 F) | -7.8 C (18.0 F) | 30.6 C (87.1 F) | 6.7 C (44.1 F) |
| Nov | 25.6 C (78.1 F) | -23.3 C (-9.9 F) | n/a | n/a |
| Dec | 19.4 C (66.9 F) | -35.6 C (-32.1 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1939 | 15 |
| 1940 | 37 |
| 1941 | 19 |
| 1942 | 27 |
| 1943 | 27 |
| 1944 | 3 |
| 1949 | 4 |
| 1950 | 33 |
| 1951 | 11 |
| 1952 | 22 |
| 1953 | 23 |
| 1954 | 7 |
| 1955 | 24 |
| 1956 | 20 |
| 1957 | 10 |
| 1958 | 14 |
| 1959 | 16 |
| 1960 | 11 |
| 1961 | 12 |
| 1962 | 19 |
| 1963 | 26 |
| 1964 | 34 |
| 1965 | 32 |
| 1966 | 15 |
| 1967 | 22 |
| 1968 | 20 |
| 1969 | 18 |
| 1970 | 20 |
| 1971 | 22 |
| 1972 | 22 |
| 1973 | 16 |
| 1974 | 25 |
| 1975 | 20 |
| 1976 | 16 |
| 1977 | 26 |
| 1978 | 14 |
| 1979 | 26 |
| 1980 | 9 |
| 1981 | 17 |
| 1982 | 14 |
| 1983 | 22 |
| 1984 | 8 |
| 1985 | 12 |
| 1986 | 10 |
| 1987 | 13 |
| 1988 | 21 |
| 1989 | 23 |
| 1990 | 20 |
| 1991 | 28 |
| 1992 | 14 |
| 1993 | 7 |
| 1994 | 11 |
| 1995 | 20 |
| 1996 | 19 |
| 1997 | 16 |
| 1998 | 17 |
| 1999 | 10 |
| 2000 | 25 |
| 2001 | 17 |
| 2002 | 16 |
| 2003 | 15 |
| 2004 | 8 |
| 2005 | 11 |
| 2006 | 21 |
| 2007 | 13 |
| 2008 | 7 |
| 2009 | 15 |
| 2010 | 12 |
| 2011 | 17 |
| 2012 | 32 |
| 2013 | 13 |
| 2014 | 13 |
| 2015 | 9 |
| 2016 | 8 |
| 2017 | 23 |
| 2018 | 11 |
| 2019 | 21 |
| 2020 | 23 |
| 2021 | 19 |
| 2022 | 9 |
| 2023 | 24 |
| 2024 | 17 |
| 2025 | 16 |
| 2026 | 10 |
All-Time Record Progression
6 new records| Date | Kind | Detail |
|---|---|---|
| 1979-02-21 | Record snow depth | Record snow depth 73.7 cm (29.0 in) |
| 1991-07-22 | Record daily precipitation | Record daily precipitation 150.1 mm (5.9 in) |
| 1994-01-20 | Record low minimum temperature | Record low minimum temperature -38.3 C (-36.9 F) |
| 1996-01-31 | Record low minimum temperature | Record low minimum temperature -38.9 C (-38.0 F) |
| 1996-02-02 | Record low maximum temperature | Record low maximum temperature -26.7 C (-16.1 F) |
| 2017-07-20 | Record daily precipitation | Record daily precipitation 161.8 mm (6.4 in) |
Wettest Day of Each Month
Jul: 161.8 mm (6.4 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 38.1 mm (1.5 in) | 4 January 1973 |
| Feb | 35.6 mm (1.4 in) | 24 February 2019 |
| Mar | 43.2 mm (1.7 in) | 23 March 1966 |
| Apr | 56.4 mm (2.2 in) | 28 April 1975 |
| May | 85.1 mm (3.4 in) | 28 May 1970 |
| Jun | 94.7 mm (3.7 in) | 13 June 1990 |
| Jul | 161.8 mm (6.4 in) | 20 July 2017 |
| Aug | 128.5 mm (5.1 in) | 11 August 2016 |
| Sep | 130.6 mm (5.1 in) | 23 September 2010 |
| Oct | 135.9 mm (5.4 in) | 15 October 1966 |
| Nov | 66.0 mm (2.6 in) | 10 November 1975 |
| Dec | 37.6 mm (1.5 in) | 12 December 1965 |
Period of Record Coverage
1939 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1939 | 119 | 33% | No |
| 1940 | 352 | 96% | Yes |
| 1941 | 343 | 94% | Yes |
| 1942 | 336 | 92% | Yes |
| 1943 | 338 | 93% | Yes |
| 1944 | 84 | 23% | No |
| 1949 | 151 | 41% | No |
| 1950 | 360 | 99% | Yes |
| 1951 | 150 | 41% | No |
| 1952 | 334 | 91% | Yes |
| 1953 | 335 | 92% | Yes |
| 1954 | 350 | 96% | Yes |
| 1955 | 360 | 99% | Yes |
| 1956 | 365 | 100% | Yes |
| 1957 | 364 | 100% | Yes |
| 1958 | 362 | 99% | Yes |
| 1959 | 363 | 99% | Yes |
| 1960 | 365 | 100% | Yes |
| 1961 | 364 | 100% | Yes |
| 1962 | 365 | 100% | Yes |
| 1963 | 364 | 100% | Yes |
| 1964 | 365 | 100% | Yes |
| 1965 | 365 | 100% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 365 | 100% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 365 | 100% | Yes |
| 1970 | 364 | 100% | Yes |
| 1971 | 364 | 100% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 363 | 99% | Yes |
| 1975 | 364 | 100% | Yes |
| 1976 | 359 | 98% | Yes |
| 1977 | 353 | 97% | Yes |
| 1978 | 364 | 100% | Yes |
| 1979 | 364 | 100% | Yes |
| 1980 | 364 | 99% | Yes |
| 1981 | 364 | 100% | Yes |
| 1982 | 324 | 89% | No |
| 1983 | 357 | 98% | Yes |
| 1984 | 351 | 96% | Yes |
| 1985 | 321 | 88% | No |
| 1986 | 361 | 99% | Yes |
| 1987 | 356 | 98% | Yes |
| 1988 | 361 | 99% | Yes |
| 1989 | 362 | 99% | Yes |
| 1990 | 362 | 99% | Yes |
| 1991 | 347 | 95% | Yes |
| 1992 | 365 | 100% | Yes |
| 1993 | 362 | 99% | Yes |
| 1994 | 361 | 99% | Yes |
| 1995 | 363 | 99% | Yes |
| 1996 | 359 | 98% | Yes |
| 1997 | 361 | 99% | Yes |
| 1998 | 360 | 99% | Yes |
| 1999 | 356 | 98% | Yes |
| 2000 | 358 | 98% | Yes |
| 2001 | 358 | 98% | Yes |
| 2002 | 362 | 99% | Yes |
| 2003 | 359 | 98% | Yes |
| 2004 | 361 | 99% | Yes |
| 2005 | 363 | 99% | Yes |
| 2006 | 358 | 98% | Yes |
| 2007 | 363 | 99% | Yes |
| 2008 | 362 | 99% | Yes |
| 2009 | 363 | 99% | Yes |
| 2010 | 363 | 99% | Yes |
| 2011 | 363 | 99% | Yes |
| 2012 | 360 | 98% | Yes |
| 2013 | 359 | 98% | Yes |
| 2014 | 356 | 98% | Yes |
| 2015 | 362 | 99% | Yes |
| 2016 | 364 | 99% | Yes |
| 2017 | 363 | 99% | Yes |
| 2018 | 361 | 99% | Yes |
| 2019 | 363 | 99% | Yes |
| 2020 | 364 | 99% | Yes |
| 2021 | 360 | 99% | Yes |
| 2022 | 357 | 98% | Yes |
| 2023 | 353 | 97% | Yes |
| 2024 | 363 | 99% | Yes |
| 2025 | 359 | 98% | Yes |
| 2026 | 286 | 78% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 13 October 2026 | Alma Dam 4, US | daily high max (Provisional) | 29.4 C (84.9 F) | 0.5 C (0.9 F) | 51 years | 23 of 100 (Routine) |
| 12 October 2026 | Alma Dam 4, US | daily high min (Provisional) | 19.4 C (66.9 F) | 2.2 C (4.0 F) | 28 years | 20 of 100 (Routine) |
| 12 October 2026 | Alma Dam 4, US | daily high max (Provisional) | 30.6 C (87.1 F) | 1.7 C (3.1 F) | 31 years | 19 of 100 (Routine) |
| 11 October 2026 | Alma Dam 4, US | daily high min (Provisional) | 17.8 C (64.0 F) | 1.1 C (2.0 F) | 64 years | 29 of 100 (Routine) |
| 11 October 2026 | Alma Dam 4, US | daily high max (Provisional) | 30.0 C (86.0 F) | 1.7 C (3.1 F) | 11 years | 13 of 100 (Routine) |
| 1 October 2026 | Alma Dam 4, US | daily high min (Tie, Provisional) | 18.3 C (64.9 F) | tie | 55 years | 6 of 100 (Routine) |
| 1 August 2026 | Alma Dam 4, US | daily low max | 22.2 C (72.0 F) | 1.7 C (3.1 F) | 55 years | 28 of 100 (Routine) |
| 28 July 2026 | Alma Dam 4, US | daily high max (Tie) | 35.0 C (95.0 F) | tie | 71 years | 7 of 100 (Routine) |
| 27 July 2026 | Alma Dam 4, US | daily high max | 34.4 C (93.9 F) | 0.5 C (0.9 F) | 71 years | 30 of 100 (Routine) |
| 16 July 2026 | Alma Dam 4, US | daily high max (Tie) | 35.6 C (96.1 F) | tie | 20 years | 3 of 100 (Routine) |
| 30 June 2026 | Alma Dam 4, US | daily high min | 25.6 C (78.1 F) | 0.6 C (1.1 F) | 72 years | 30 of 100 (Routine) |
| 14 April 2026 | Alma Dam 4, US | daily rain | 51.3 mm (2.0 in) | 19.3 mm (0.8 in) | 8 years | 32 of 100 (Routine) |
| 22 March 2026 | Alma Dam 4, US | daily high max | 25.0 C (77.0 F) | 2.8 C (5.0 F) | 13 years | 16 of 100 (Routine) |
| 18 March 2026 | Alma Dam 4, US | daily snow depth (Tie) | 43.2 cm (17.0 in) | tie | 75 years | 7 of 100 (Routine) |
| 17 March 2026 | Alma Dam 4, US | daily snow depth | 40.6 cm (16.0 in) | 5.0 cm (2.0 in) | 69 years | 33 of 100 (Routine) |
| 16 March 2026 | Alma Dam 4, US | daily snowfall | 15.2 cm (6.0 in) | 5.0 cm (2.0 in) | 55 years | 33 of 100 (Routine) |
| 16 March 2026 | Alma Dam 4, US | daily snow depth (Tie) | 40.6 cm (16.0 in) | tie | 69 years | 7 of 100 (Routine) |
| 15 March 2026 | Alma Dam 4, US | daily snowfall | 24.1 cm (9.5 in) | 13.9 cm (5.5 in) | 36 years | 42 of 100 (Notable) |
| 9 March 2026 | Alma Dam 4, US | daily high min | 4.4 C (39.9 F) | 0.5 C (0.9 F) | 9 years | 10 of 100 (Routine) |
| 15 February 2026 | Alma Dam 4, US | daily high max | 13.3 C (55.9 F) | 1.1 C (2.0 F) | 42 years | 21 of 100 (Routine) |
Climate Trend
73 complete years, 1940 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1940 | 6.7 C | -1.56 C |
| 1941 | 8.6 C | +0.32 C |
| 1942 | 7.6 C | -0.71 C |
| 1943 | 6.5 C | -1.74 C |
| 1950 | 5.9 C | -2.33 C |
| 1955 | 8.3 C | 0.00 C |
| 1956 | 8.2 C | -0.10 C |
| 1957 | 8.4 C | +0.16 C |
| 1958 | 8.5 C | +0.24 C |
| 1959 | 8.2 C | -0.04 C |
| 1960 | 8.3 C | +0.01 C |
| 1961 | 8.3 C | +0.07 C |
| 1962 | 7.8 C | -0.51 C |
| 1963 | 8.5 C | +0.22 C |
| 1964 | 9.1 C | +0.80 C |
| 1965 | 7.3 C | -0.92 C |
| 1966 | 7.6 C | -0.69 C |
| 1967 | 7.5 C | -0.72 C |
| 1968 | 8.6 C | +0.33 C |
| 1969 | 7.7 C | -0.54 C |
| 1970 | 7.7 C | -0.52 C |
| 1971 | 7.6 C | -0.67 C |
| 1972 | 6.5 C | -1.79 C |
| 1973 | 8.7 C | +0.39 C |
| 1974 | 7.8 C | -0.51 C |
| 1975 | 7.5 C | -0.76 C |
| 1976 | 7.7 C | -0.56 C |
| 1977 | 8.3 C | +0.08 C |
| 1978 | 6.4 C | -1.90 C |
| 1979 | 6.1 C | -2.13 C |
| 1980 | 7.7 C | -0.61 C |
| 1981 | 8.2 C | -0.02 C |
| 1983 | 7.9 C | -0.41 C |
| 1984 | 8.1 C | -0.19 C |
| 1986 | 8.7 C | +0.44 C |
| 1987 | 10.4 C | +2.16 C |
| 1988 | 8.7 C | +0.43 C |
| 1989 | 7.3 C | -1.00 C |
| 1990 | 9.4 C | +1.10 C |
| 1992 | 8.2 C | -0.02 C |
| 1993 | 7.6 C | -0.71 C |
| 1994 | 8.1 C | -0.18 C |
| 1995 | 8.1 C | -0.14 C |
| 1996 | 6.5 C | -1.73 C |
| 1997 | 8.0 C | -0.30 C |
| 1998 | 10.3 C | +2.06 C |
| 1999 | 8.9 C | +0.68 C |
| 2000 | 8.1 C | -0.12 C |
| 2001 | 9.2 C | +0.93 C |
| 2002 | 9.0 C | +0.73 C |
| 2003 | 8.4 C | +0.15 C |
| 2004 | 8.4 C | +0.18 C |
| 2005 | 9.4 C | +1.11 C |
| 2006 | 9.9 C | +1.64 C |
| 2007 | 9.1 C | +0.86 C |
| 2008 | 7.5 C | -0.78 C |
| 2009 | 8.0 C | -0.26 C |
| 2010 | 9.4 C | +1.13 C |
| 2011 | 9.0 C | +0.74 C |
| 2012 | 10.7 C | +2.48 C |
| 2013 | 7.8 C | -0.49 C |
| 2014 | 7.1 C | -1.15 C |
| 2015 | 9.7 C | +1.47 C |
| 2016 | 10.4 C | +2.16 C |
| 2017 | 9.5 C | +1.22 C |
| 2018 | 8.5 C | +0.20 C |
| 2019 | 6.8 C | -1.49 C |
| 2020 | 8.3 C | +0.02 C |
| 2021 | 8.9 C | +0.67 C |
| 2022 | 7.5 C | -0.77 C |
| 2023 | 9.7 C | +1.46 C |
| 2024 | 10.3 C | +2.00 C |
| 2025 | 8.8 C | +0.58 C |
The annual mean temperature here has risen by 0.2 C (0.1 to 0.3) per decade over 1940 to 2025. In Fahrenheit: 0.3 F (0.2 to 0.5) per decade. The slope is a straight line fitted to 73 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.2 C (0.1 to 0.3) per decade | 0.3 F (0.2 to 0.5) per decade | 1940 to 2025 | 73 | Rise |
| Mean daily maximum | 0.15 C (0.05 to 0.24) per decade | 0.3 F (0.1 to 0.4) per decade | 1940 to 2025 | 73 | Rise |
| Mean daily minimum | 0.2 C (0.1 to 0.3) per decade | 0.4 F (0.2 to 0.6) per decade | 1940 to 2025 | 73 | Rise |
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
1936 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 38.3 C (100.9 F) | 1956 | 34.4 C (93.9 F) | 84 |
| Coldest night (TNn) | -38.9 C (-38.0 F) | 1996 | -28.3 C (-18.9 F) | 84 |
| Wettest day (Rx1day) | 161.8 mm (6.4 in) | 2017 | 59.4 mm (2.3 in) | 91 |
| Wettest five days (Rx5day) | 237.8 mm (9.4 in) | 1991 | 97.8 mm (3.9 in) | 91 |
| Longest dry spell (CDD) | 53 days | 1943 | 23 days | 91 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1936 | n/a |
| 1937 | n/a |
| 1938 | n/a |
| 1939 | 33.9 C (93.0 F) |
| 1940 | 35.6 C (96.1 F) |
| 1941 | 33.9 C (93.0 F) |
| 1942 | 33.9 C (93.0 F) |
| 1943 | 35.6 C (96.1 F) |
| 1944 | 12.2 C (54.0 F) |
| 1945 | n/a |
| 1946 | n/a |
| 1947 | n/a |
| 1948 | n/a |
| 1949 | 34.4 C (93.9 F) |
| 1950 | 32.2 C (90.0 F) |
| 1951 | 28.3 C (82.9 F) |
| 1952 | 33.9 C (93.0 F) |
| 1953 | 34.4 C (93.9 F) |
| 1954 | 35.6 C (96.1 F) |
| 1955 | 37.8 C (100.0 F) |
| 1956 | 38.3 C (100.9 F) |
| 1957 | 33.9 C (93.0 F) |
| 1958 | 34.4 C (93.9 F) |
| 1959 | 33.3 C (91.9 F) |
| 1960 | 34.4 C (93.9 F) |
| 1961 | 34.4 C (93.9 F) |
| 1962 | 33.9 C (93.0 F) |
| 1963 | 35.0 C (95.0 F) |
| 1964 | 37.2 C (99.0 F) |
| 1965 | 36.1 C (97.0 F) |
| 1966 | 35.6 C (96.1 F) |
| 1967 | 31.7 C (89.1 F) |
| 1968 | 33.9 C (93.0 F) |
| 1969 | 33.3 C (91.9 F) |
| 1970 | 36.1 C (97.0 F) |
| 1971 | 35.0 C (95.0 F) |
| 1972 | 35.0 C (95.0 F) |
| 1973 | 35.0 C (95.0 F) |
| 1974 | 37.2 C (99.0 F) |
| 1975 | 33.3 C (91.9 F) |
| 1976 | 35.6 C (96.1 F) |
| 1977 | 34.4 C (93.9 F) |
| 1978 | 36.1 C (97.0 F) |
| 1979 | 31.7 C (89.1 F) |
| 1980 | 34.4 C (93.9 F) |
| 1981 | 32.8 C (91.0 F) |
| 1982 | 35.0 C (95.0 F) |
| 1983 | 37.8 C (100.0 F) |
| 1984 | 35.6 C (96.1 F) |
| 1985 | 33.9 C (93.0 F) |
| 1986 | 36.1 C (97.0 F) |
| 1987 | 35.6 C (96.1 F) |
| 1988 | 37.8 C (100.0 F) |
| 1989 | 34.4 C (93.9 F) |
| 1990 | 36.7 C (98.1 F) |
| 1991 | 32.2 C (90.0 F) |
| 1992 | 32.2 C (90.0 F) |
| 1993 | 33.3 C (91.9 F) |
| 1994 | 32.8 C (91.0 F) |
| 1995 | 37.8 C (100.0 F) |
| 1996 | 33.9 C (93.0 F) |
| 1997 | 33.3 C (91.9 F) |
| 1998 | 33.3 C (91.9 F) |
| 1999 | 35.6 C (96.1 F) |
| 2000 | 32.2 C (90.0 F) |
| 2001 | 38.3 C (100.9 F) |
| 2002 | 33.9 C (93.0 F) |
| 2003 | 33.9 C (93.0 F) |
| 2004 | 31.7 C (89.1 F) |
| 2005 | 34.4 C (93.9 F) |
| 2006 | 36.1 C (97.0 F) |
| 2007 | 34.4 C (93.9 F) |
| 2008 | 31.7 C (89.1 F) |
| 2009 | 33.9 C (93.0 F) |
| 2010 | 33.3 C (91.9 F) |
| 2011 | 36.1 C (97.0 F) |
| 2012 | 36.7 C (98.1 F) |
| 2013 | 34.4 C (93.9 F) |
| 2014 | 31.1 C (88.0 F) |
| 2015 | 33.3 C (91.9 F) |
| 2016 | 34.4 C (93.9 F) |
| 2017 | 34.4 C (93.9 F) |
| 2018 | 34.4 C (93.9 F) |
| 2019 | 33.3 C (91.9 F) |
| 2020 | 32.8 C (91.0 F) |
| 2021 | 34.4 C (93.9 F) |
| 2022 | 35.0 C (95.0 F) |
| 2023 | 37.8 C (100.0 F) |
| 2024 | 35.0 C (95.0 F) |
| 2025 | 34.4 C (93.9 F) |
| 2026 | 35.6 C (96.1 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1936 | n/a |
| 1937 | n/a |
| 1938 | n/a |
| 1939 | -20.0 C (-4.0 F) |
| 1940 | -28.3 C (-18.9 F) |
| 1941 | -26.7 C (-16.1 F) |
| 1942 | -27.8 C (-18.0 F) |
| 1943 | -31.1 C (-24.0 F) |
| 1944 | -22.2 C (-8.0 F) |
| 1945 | n/a |
| 1946 | n/a |
| 1947 | n/a |
| 1948 | n/a |
| 1949 | -22.2 C (-8.0 F) |
| 1950 | -32.2 C (-26.0 F) |
| 1951 | -37.8 C (-36.0 F) |
| 1952 | -30.0 C (-22.0 F) |
| 1953 | -23.3 C (-9.9 F) |
| 1954 | -30.0 C (-22.0 F) |
| 1955 | -28.3 C (-18.9 F) |
| 1956 | -28.3 C (-18.9 F) |
| 1957 | -25.0 C (-13.0 F) |
| 1958 | -25.6 C (-14.1 F) |
| 1959 | -27.8 C (-18.0 F) |
| 1960 | -24.4 C (-11.9 F) |
| 1961 | -26.7 C (-16.1 F) |
| 1962 | -32.8 C (-27.0 F) |
| 1963 | -32.8 C (-27.0 F) |
| 1964 | -23.9 C (-11.0 F) |
| 1965 | -33.9 C (-29.0 F) |
| 1966 | -32.8 C (-27.0 F) |
| 1967 | -33.9 C (-29.0 F) |
| 1968 | -31.7 C (-25.1 F) |
| 1969 | -28.9 C (-20.0 F) |
| 1970 | -34.4 C (-29.9 F) |
| 1971 | -35.6 C (-32.1 F) |
| 1972 | -32.2 C (-26.0 F) |
| 1973 | -31.1 C (-24.0 F) |
| 1974 | -30.6 C (-23.1 F) |
| 1975 | -28.9 C (-20.0 F) |
| 1976 | -31.7 C (-25.1 F) |
| 1977 | -36.7 C (-34.1 F) |
| 1978 | -30.0 C (-22.0 F) |
| 1979 | -33.3 C (-27.9 F) |
| 1980 | -28.9 C (-20.0 F) |
| 1981 | -26.7 C (-16.1 F) |
| 1982 | -32.2 C (-26.0 F) |
| 1983 | -35.6 C (-32.1 F) |
| 1984 | -30.6 C (-23.1 F) |
| 1985 | -32.8 C (-27.0 F) |
| 1986 | -28.3 C (-18.9 F) |
| 1987 | -24.4 C (-11.9 F) |
| 1988 | -27.2 C (-17.0 F) |
| 1989 | -31.1 C (-24.0 F) |
| 1990 | -29.4 C (-20.9 F) |
| 1991 | -26.1 C (-15.0 F) |
| 1992 | -22.8 C (-9.0 F) |
| 1993 | -25.0 C (-13.0 F) |
| 1994 | -38.3 C (-36.9 F) |
| 1995 | -23.9 C (-11.0 F) |
| 1996 | -38.9 C (-38.0 F) |
| 1997 | -30.0 C (-22.0 F) |
| 1998 | -23.9 C (-11.0 F) |
| 1999 | -27.8 C (-18.0 F) |
| 2000 | -33.3 C (-27.9 F) |
| 2001 | -24.4 C (-11.9 F) |
| 2002 | -19.4 C (-2.9 F) |
| 2003 | -24.4 C (-11.9 F) |
| 2004 | -28.3 C (-18.9 F) |
| 2005 | -23.9 C (-11.0 F) |
| 2006 | -26.1 C (-15.0 F) |
| 2007 | -26.7 C (-16.1 F) |
| 2008 | -26.1 C (-15.0 F) |
| 2009 | -32.8 C (-27.0 F) |
| 2010 | -27.8 C (-18.0 F) |
| 2011 | -28.9 C (-20.0 F) |
| 2012 | -22.8 C (-9.0 F) |
| 2013 | -25.0 C (-13.0 F) |
| 2014 | -29.4 C (-20.9 F) |
| 2015 | -25.0 C (-13.0 F) |
| 2016 | -28.3 C (-18.9 F) |
| 2017 | -25.0 C (-13.0 F) |
| 2018 | -25.6 C (-14.1 F) |
| 2019 | -33.9 C (-29.0 F) |
| 2020 | -25.6 C (-14.1 F) |
| 2021 | -28.3 C (-18.9 F) |
| 2022 | -26.7 C (-16.1 F) |
| 2023 | -23.9 C (-11.0 F) |
| 2024 | -23.3 C (-9.9 F) |
| 2025 | -27.2 C (-17.0 F) |
| 2026 | -28.9 C (-20.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1936 | 14.0 mm (0.6 in) |
| 1937 | 91.4 mm (3.6 in) |
| 1938 | 42.9 mm (1.7 in) |
| 1939 | 49.5 mm (1.9 in) |
| 1940 | 63.5 mm (2.5 in) |
| 1941 | 44.5 mm (1.8 in) |
| 1942 | 83.6 mm (3.3 in) |
| 1943 | 68.3 mm (2.7 in) |
| 1944 | 51.6 mm (2.0 in) |
| 1945 | 34.8 mm (1.4 in) |
| 1946 | 52.3 mm (2.1 in) |
| 1947 | 40.6 mm (1.6 in) |
| 1948 | 34.5 mm (1.4 in) |
| 1949 | 51.8 mm (2.0 in) |
| 1950 | 75.4 mm (3.0 in) |
| 1951 | 103.6 mm (4.1 in) |
| 1952 | 95.3 mm (3.8 in) |
| 1953 | 33.5 mm (1.3 in) |
| 1954 | 97.8 mm (3.9 in) |
| 1955 | 85.6 mm (3.4 in) |
| 1956 | 57.9 mm (2.3 in) |
| 1957 | 48.3 mm (1.9 in) |
| 1958 | 38.6 mm (1.5 in) |
| 1959 | 41.1 mm (1.6 in) |
| 1960 | 34.3 mm (1.4 in) |
| 1961 | 39.6 mm (1.6 in) |
| 1962 | 83.1 mm (3.3 in) |
| 1963 | 85.9 mm (3.4 in) |
| 1964 | 76.2 mm (3.0 in) |
| 1965 | 37.6 mm (1.5 in) |
| 1966 | 135.9 mm (5.4 in) |
| 1967 | 41.1 mm (1.6 in) |
| 1968 | 61.7 mm (2.4 in) |
| 1969 | 69.1 mm (2.7 in) |
| 1970 | 85.1 mm (3.4 in) |
| 1971 | 42.7 mm (1.7 in) |
| 1972 | 45.7 mm (1.8 in) |
| 1973 | 61.5 mm (2.4 in) |
| 1974 | 48.8 mm (1.9 in) |
| 1975 | 75.9 mm (3.0 in) |
| 1976 | 36.8 mm (1.4 in) |
| 1977 | 38.9 mm (1.5 in) |
| 1978 | 120.7 mm (4.8 in) |
| 1979 | 71.1 mm (2.8 in) |
| 1980 | 85.6 mm (3.4 in) |
| 1981 | 35.8 mm (1.4 in) |
| 1982 | 40.9 mm (1.6 in) |
| 1983 | 80.5 mm (3.2 in) |
| 1984 | 54.6 mm (2.1 in) |
| 1985 | 30.0 mm (1.2 in) |
| 1986 | 47.8 mm (1.9 in) |
| 1987 | 61.2 mm (2.4 in) |
| 1988 | 61.0 mm (2.4 in) |
| 1989 | 30.5 mm (1.2 in) |
| 1990 | 94.7 mm (3.7 in) |
| 1991 | 150.1 mm (5.9 in) |
| 1992 | 82.8 mm (3.3 in) |
| 1993 | 73.7 mm (2.9 in) |
| 1994 | 68.8 mm (2.7 in) |
| 1995 | 71.1 mm (2.8 in) |
| 1996 | 43.2 mm (1.7 in) |
| 1997 | 40.6 mm (1.6 in) |
| 1998 | 72.4 mm (2.9 in) |
| 1999 | 63.5 mm (2.5 in) |
| 2000 | 49.8 mm (2.0 in) |
| 2001 | 55.9 mm (2.2 in) |
| 2002 | 69.9 mm (2.8 in) |
| 2003 | 54.4 mm (2.1 in) |
| 2004 | 91.2 mm (3.6 in) |
| 2005 | 49.3 mm (1.9 in) |
| 2006 | 58.7 mm (2.3 in) |
| 2007 | 69.9 mm (2.8 in) |
| 2008 | 59.4 mm (2.3 in) |
| 2009 | 73.2 mm (2.9 in) |
| 2010 | 130.6 mm (5.1 in) |
| 2011 | 44.2 mm (1.7 in) |
| 2012 | 62.7 mm (2.5 in) |
| 2013 | 73.7 mm (2.9 in) |
| 2014 | 54.1 mm (2.1 in) |
| 2015 | 55.9 mm (2.2 in) |
| 2016 | 128.5 mm (5.1 in) |
| 2017 | 161.8 mm (6.4 in) |
| 2018 | 113.8 mm (4.5 in) |
| 2019 | 80.0 mm (3.1 in) |
| 2020 | 73.7 mm (2.9 in) |
| 2021 | 56.1 mm (2.2 in) |
| 2022 | 51.6 mm (2.0 in) |
| 2023 | 41.9 mm (1.6 in) |
| 2024 | 74.7 mm (2.9 in) |
| 2025 | 47.2 mm (1.9 in) |
| 2026 | 51.3 mm (2.0 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1936 | 18.6 mm (0.7 in) |
| 1937 | 42.2 mm (1.7 in) |
| 1938 | 72.3 mm (2.8 in) |
| 1939 | 78.0 mm (3.1 in) |
| 1940 | 86.8 mm (3.4 in) |
| 1941 | 63.0 mm (2.5 in) |
| 1942 | 183.9 mm (7.2 in) |
| 1943 | 98.6 mm (3.9 in) |
| 1944 | 63.3 mm (2.5 in) |
| 1945 | 95.7 mm (3.8 in) |
| 1946 | 75.3 mm (3.0 in) |
| 1947 | 53.1 mm (2.1 in) |
| 1948 | 53.6 mm (2.1 in) |
| 1949 | 59.5 mm (2.3 in) |
| 1950 | 93.4 mm (3.7 in) |
| 1951 | 104.4 mm (4.1 in) |
| 1952 | 109.0 mm (4.3 in) |
| 1953 | 69.6 mm (2.7 in) |
| 1954 | 140.0 mm (5.5 in) |
| 1955 | 103.9 mm (4.1 in) |
| 1956 | 86.8 mm (3.4 in) |
| 1957 | 65.3 mm (2.6 in) |
| 1958 | 56.4 mm (2.2 in) |
| 1959 | 70.8 mm (2.8 in) |
| 1960 | 62.2 mm (2.4 in) |
| 1961 | 60.7 mm (2.4 in) |
| 1962 | 145.0 mm (5.7 in) |
| 1963 | 94.3 mm (3.7 in) |
| 1964 | 113.5 mm (4.5 in) |
| 1965 | 74.5 mm (2.9 in) |
| 1966 | 144.9 mm (5.7 in) |
| 1967 | 111.5 mm (4.4 in) |
| 1968 | 100.9 mm (4.0 in) |
| 1969 | 108.2 mm (4.3 in) |
| 1970 | 107.7 mm (4.2 in) |
| 1971 | 74.9 mm (2.9 in) |
| 1972 | 104.9 mm (4.1 in) |
| 1973 | 85.1 mm (3.4 in) |
| 1974 | 98.6 mm (3.9 in) |
| 1975 | 110.2 mm (4.3 in) |
| 1976 | 52.6 mm (2.1 in) |
| 1977 | 61.8 mm (2.4 in) |
| 1978 | 149.9 mm (5.9 in) |
| 1979 | 122.9 mm (4.8 in) |
| 1980 | 109.2 mm (4.3 in) |
| 1981 | 70.7 mm (2.8 in) |
| 1982 | 68.6 mm (2.7 in) |
| 1983 | 102.3 mm (4.0 in) |
| 1984 | 98.3 mm (3.9 in) |
| 1985 | 53.3 mm (2.1 in) |
| 1986 | 116.5 mm (4.6 in) |
| 1987 | 92.7 mm (3.6 in) |
| 1988 | 115.1 mm (4.5 in) |
| 1989 | 64.6 mm (2.5 in) |
| 1990 | 123.1 mm (4.8 in) |
| 1991 | 237.8 mm (9.4 in) |
| 1992 | 181.8 mm (7.2 in) |
| 1993 | 144.7 mm (5.7 in) |
| 1994 | 92.9 mm (3.7 in) |
| 1995 | 111.2 mm (4.4 in) |
| 1996 | 58.0 mm (2.3 in) |
| 1997 | 91.5 mm (3.6 in) |
| 1998 | 161.3 mm (6.4 in) |
| 1999 | 98.8 mm (3.9 in) |
| 2000 | 105.7 mm (4.2 in) |
| 2001 | 93.8 mm (3.7 in) |
| 2002 | 101.7 mm (4.0 in) |
| 2003 | 88.0 mm (3.5 in) |
| 2004 | 105.2 mm (4.1 in) |
| 2005 | 92.2 mm (3.6 in) |
| 2006 | 74.2 mm (2.9 in) |
| 2007 | 102.4 mm (4.0 in) |
| 2008 | 98.3 mm (3.9 in) |
| 2009 | 75.5 mm (3.0 in) |
| 2010 | 185.7 mm (7.3 in) |
| 2011 | 97.8 mm (3.9 in) |
| 2012 | 117.3 mm (4.6 in) |
| 2013 | 116.6 mm (4.6 in) |
| 2014 | 112.8 mm (4.4 in) |
| 2015 | 67.1 mm (2.6 in) |
| 2016 | 194.3 mm (7.6 in) |
| 2017 | 181.6 mm (7.1 in) |
| 2018 | 120.2 mm (4.7 in) |
| 2019 | 145.8 mm (5.7 in) |
| 2020 | 74.4 mm (2.9 in) |
| 2021 | 114.8 mm (4.5 in) |
| 2022 | 64.8 mm (2.6 in) |
| 2023 | 77.2 mm (3.0 in) |
| 2024 | 98.8 mm (3.9 in) |
| 2025 | 74.0 mm (2.9 in) |
| 2026 | 88.1 mm (3.5 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1936 | 22 days |
| 1937 | 18 days |
| 1938 | 26 days |
| 1939 | 18 days |
| 1940 | 24 days |
| 1941 | 17 days |
| 1942 | 37 days |
| 1943 | 53 days |
| 1944 | 26 days |
| 1945 | 25 days |
| 1946 | 27 days |
| 1947 | 40 days |
| 1948 | 37 days |
| 1949 | 34 days |
| 1950 | 24 days |
| 1951 | 21 days |
| 1952 | 15 days |
| 1953 | 23 days |
| 1954 | 23 days |
| 1955 | 19 days |
| 1956 | 21 days |
| 1957 | 24 days |
| 1958 | 33 days |
| 1959 | 39 days |
| 1960 | 26 days |
| 1961 | 30 days |
| 1962 | 39 days |
| 1963 | 19 days |
| 1964 | 38 days |
| 1965 | 22 days |
| 1966 | 24 days |
| 1967 | 30 days |
| 1968 | 36 days |
| 1969 | 34 days |
| 1970 | 32 days |
| 1971 | 20 days |
| 1972 | 22 days |
| 1973 | 21 days |
| 1974 | 14 days |
| 1975 | 15 days |
| 1976 | 44 days |
| 1977 | 19 days |
| 1978 | 20 days |
| 1979 | 29 days |
| 1980 | 30 days |
| 1981 | 28 days |
| 1982 | 20 days |
| 1983 | 19 days |
| 1984 | 23 days |
| 1985 | 14 days |
| 1986 | 22 days |
| 1987 | 22 days |
| 1988 | 31 days |
| 1989 | 33 days |
| 1990 | 20 days |
| 1991 | 21 days |
| 1992 | 19 days |
| 1993 | 14 days |
| 1994 | 25 days |
| 1995 | 27 days |
| 1996 | 22 days |
| 1997 | 20 days |
| 1998 | 31 days |
| 1999 | 25 days |
| 2000 | 23 days |
| 2001 | 24 days |
| 2002 | 26 days |
| 2003 | 28 days |
| 2004 | 23 days |
| 2005 | 17 days |
| 2006 | 25 days |
| 2007 | 22 days |
| 2008 | 18 days |
| 2009 | 23 days |
| 2010 | 23 days |
| 2011 | 26 days |
| 2012 | 25 days |
| 2013 | 26 days |
| 2014 | 12 days |
| 2015 | 39 days |
| 2016 | 30 days |
| 2017 | 20 days |
| 2018 | 20 days |
| 2019 | 20 days |
| 2020 | 44 days |
| 2021 | 16 days |
| 2022 | 17 days |
| 2023 | 49 days |
| 2024 | 34 days |
| 2025 | 23 days |
| 2026 | 16 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
73 years with a frostAcross 73 years with a frost, the median last spring frost at Alma Dam 4 falls on 24 April and the median first autumn frost on 13 October, which leaves a median of 174 days between them.
In 1996 to 2025 the median growing season was 176 days. That is 9 days more than in 1940 to 1979.
Fitted over all years, the growing season changes by +1.5 days per decade at this station.
| Measure | Median, all years | Earliest period (1940 to 1979) | Recent period (1996 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 24 April | 27 April | 24 April | 3 days earlier | -0.3 days per decade |
| First autumn frost | 13 October | 11 October | 20 October | 9 days later | +1.2 days per decade |
| Growing days | 174 days | 167 days | 176 days | 9 days more | +1.5 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
88 years, 1937 to 2025A day with at least 60.0 mm (2.4 in) of rain is expected about once in 2 years. A day with at least 163.8 mm (6.4 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 60.0 mm (2.4 in) | |
| 5 years | 83.7 mm (3.3 in) | |
| 10 years | 100.9 mm (4.0 in) | |
| 25 years | 124.6 mm (4.9 in) | |
| 50 years | 143.6 mm (5.7 in) | |
| 100 years | 163.8 mm (6.4 in) | Longer than the 88 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, 88 years of values from 1937 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: 161.8 mm (6.4 in) in 2017; 150.1 mm (5.9 in) in 1991; 135.9 mm (5.4 in) in 1966.
Station Changes
2 suspected2 changes were suspected in the annual mean temperature of Alma Dam 4, at 2011 and 2019. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 2011 ran 0.3 C (0.5 F) higher than in the years before (possible change).
- Relative to 5 neighbouring stations, the station's annual mean temperature from 2019 ran 0.9 C (1.6 F) lower than in the years before (likely change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 2011 | +0.3 | +0.5 | possible | 5 |
| 2019 | -0.9 | -1.6 | likely | 5 |
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
2011 to 2025 against 1961 to 1990Over 2011 to 2025, Alma Dam 4 had a mean temperature of 8.9 C (48.0 F) and 918.6 mm (36.2 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Rockford Gtr Rockford AP (United States, 330 km away), Janesville (United States, 298 km away) and Lake Geneva Wwtp (United States, 341 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Rockford Gtr Rockford AP | United States | 330 km (205 mi) | 8.7 C (47.7 F) | 942.7 mm (37.1 in) | 0.77 |
| Janesville | United States | 298 km (185 mi) | 9.1 C (48.3 F) | 851.7 mm (33.5 in) | 0.79 |
| Lake Geneva Wwtp | United States | 341 km (212 mi) | 8.9 C (48.0 F) | 937.9 mm (36.9 in) | 0.80 |
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
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 (2026-10-15).