Bison Weather Records (USC00390701)
Record envelope, standing records and threshold days for Bison (USC00390701), South Dakota, United States, with 111 years of record.
Key Facts for Bison
- Bison (USC00390701) is a weather station in South Dakota, United States at 45.53 latitude and -102.47 longitude, 847 m (2,780 ft) above sea level.
- The station reports from 1916 to 2026, 111 years of record.
- 1,464 records set at Bison still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Bison set a daily record low minimum temperature of 6.7 C (44.1 F) on 4 August 2026.
About the Station
- Location: South Dakota, United States, 45.53 latitude, -102.47 longitude.
- Elevation: 847 m (2,780 ft).
- Period of record: 1916 to 2026, 111 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
11 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 21.7 C (71.1 F) | -36.7 C (-34.1 F) | 12.8 C (55.0 F) | -32.2 C (-26.0 F) |
| Feb | 21.7 C (71.1 F) | -41.1 C (-42.0 F) | 16.7 C (62.1 F) | -18.9 C (-2.0 F) |
| Mar | 27.2 C (81.0 F) | -33.3 C (-27.9 F) | 26.1 C (79.0 F) | -18.9 C (-2.0 F) |
| Apr | 33.3 C (91.9 F) | -21.1 C (-6.0 F) | 30.0 C (86.0 F) | -8.3 C (17.1 F) |
| May | 38.9 C (102.0 F) | -11.7 C (10.9 F) | 32.2 C (90.0 F) | -4.4 C (24.1 F) |
| Jun | 43.3 C (109.9 F) | -2.2 C (28.0 F) | 32.8 C (91.0 F) | 4.4 C (39.9 F) |
| Jul | 43.9 C (111.0 F) | 2.8 C (37.0 F) | 40.6 C (105.1 F) | 11.1 C (52.0 F) |
| Aug | 41.7 C (107.1 F) | 0.6 C (33.1 F) | 38.3 C (100.9 F) | 6.7 C (44.1 F) |
| Sep | 41.7 C (107.1 F) | -7.8 C (18.0 F) | n/a | n/a |
| Oct | 33.3 C (91.9 F) | -22.2 C (-8.0 F) | n/a | n/a |
| Nov | 31.1 C (88.0 F) | -27.2 C (-17.0 F) | n/a | n/a |
| Dec | 20.6 C (69.1 F) | -36.7 C (-34.1 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1916 | 16 |
| 1917 | 27 |
| 1918 | 19 |
| 1919 | 33 |
| 1920 | 1 |
| 1921 | 9 |
| 1931 | 3 |
| 1932 | 24 |
| 1933 | 23 |
| 1934 | 22 |
| 1935 | 14 |
| 1936 | 67 |
| 1937 | 17 |
| 1938 | 10 |
| 1939 | 27 |
| 1940 | 14 |
| 1941 | 15 |
| 1942 | 22 |
| 1943 | 19 |
| 1944 | 8 |
| 1945 | 22 |
| 1946 | 5 |
| 1947 | 13 |
| 1948 | 14 |
| 1949 | 7 |
| 1950 | 32 |
| 1951 | 17 |
| 1952 | 18 |
| 1953 | 10 |
| 1954 | 15 |
| 1955 | 11 |
| 1956 | 13 |
| 1957 | 9 |
| 1958 | 19 |
| 1959 | 12 |
| 1960 | 14 |
| 1961 | 2 |
| 1962 | 16 |
| 1963 | 8 |
| 1964 | 11 |
| 1965 | 22 |
| 1966 | 11 |
| 1967 | 15 |
| 1968 | 11 |
| 1969 | 10 |
| 1970 | 5 |
| 1971 | 11 |
| 1972 | 14 |
| 1973 | 13 |
| 1974 | 12 |
| 1975 | 2 |
| 1976 | 3 |
| 1977 | 13 |
| 1978 | 7 |
| 1979 | 11 |
| 1980 | 21 |
| 1981 | 7 |
| 1982 | 5 |
| 1983 | 14 |
| 1984 | 15 |
| 1985 | 33 |
| 1986 | 10 |
| 1987 | 8 |
| 1988 | 15 |
| 1989 | 24 |
| 1990 | 16 |
| 1991 | 17 |
| 1992 | 32 |
| 1993 | 10 |
| 1994 | 10 |
| 1995 | 16 |
| 1996 | 13 |
| 1997 | 14 |
| 1998 | 12 |
| 1999 | 13 |
| 2000 | 11 |
| 2001 | 13 |
| 2002 | 14 |
| 2003 | 16 |
| 2004 | 4 |
| 2005 | 15 |
| 2006 | 13 |
| 2007 | 23 |
| 2008 | 4 |
| 2009 | 8 |
| 2010 | 3 |
| 2011 | 5 |
| 2012 | 29 |
| 2013 | 8 |
| 2014 | 12 |
| 2015 | 14 |
| 2016 | 12 |
| 2017 | 14 |
| 2018 | 12 |
| 2019 | 7 |
| 2020 | 16 |
| 2021 | 19 |
| 2022 | 15 |
| 2023 | 11 |
| 2024 | 16 |
| 2025 | 12 |
| 2026 | 15 |
All-Time Record Progression
5 new records| Date | Kind | Detail |
|---|---|---|
| 1967-04-30 | Record daily precipitation | Record daily precipitation 82.3 mm (3.2 in) |
| 1999-08-12 | Record daily precipitation | Record daily precipitation 84.3 mm (3.3 in) |
| 2010-01-07 | Record snow depth | Record snow depth 66.0 cm (26.0 in) |
| 2013-09-08 | Record daily precipitation | Record daily precipitation 93.0 mm (3.7 in) |
| 2019-03-10 | Record snow depth | Record snow depth 68.6 cm (27.0 in) |
Wettest Day of Each Month
Sep: 93.0 mm (3.7 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 50.8 mm (2.0 in) | 27 January 1944 |
| Feb | 28.4 mm (1.1 in) | 20 February 2011 |
| Mar | 61.0 mm (2.4 in) | 27 March 1950 |
| Apr | 82.3 mm (3.2 in) | 30 April 1967 |
| May | 81.3 mm (3.2 in) | 23 May 1933 |
| Jun | 81.5 mm (3.2 in) | 18 June 2014 |
| Jul | 64.8 mm (2.6 in) | 16 July 1993 |
| Aug | 84.3 mm (3.3 in) | 12 August 1999 |
| Sep | 93.0 mm (3.7 in) | 8 September 2013 |
| Oct | 66.0 mm (2.6 in) | 13 October 2021 |
| Nov | 36.3 mm (1.4 in) | 6 November 2008 |
| Dec | 23.4 mm (0.9 in) | 11 December 2025 |
Period of Record Coverage
1916 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1916 | 236 | 64% | No |
| 1917 | 343 | 94% | Yes |
| 1918 | 345 | 95% | Yes |
| 1919 | 237 | 65% | No |
| 1920 | 31 | 8% | No |
| 1921 | 149 | 41% | No |
| 1931 | 54 | 15% | No |
| 1932 | 339 | 93% | Yes |
| 1933 | 364 | 100% | Yes |
| 1934 | 242 | 66% | No |
| 1935 | 339 | 93% | Yes |
| 1936 | 366 | 100% | Yes |
| 1937 | 365 | 100% | Yes |
| 1938 | 362 | 99% | Yes |
| 1939 | 356 | 98% | Yes |
| 1940 | 344 | 94% | Yes |
| 1941 | 343 | 94% | Yes |
| 1942 | 338 | 93% | Yes |
| 1943 | 309 | 85% | No |
| 1944 | 192 | 52% | No |
| 1945 | 283 | 78% | No |
| 1946 | 207 | 57% | No |
| 1947 | 202 | 55% | No |
| 1948 | 223 | 61% | No |
| 1949 | 242 | 66% | No |
| 1950 | 361 | 99% | Yes |
| 1951 | 266 | 73% | No |
| 1952 | 364 | 99% | Yes |
| 1953 | 353 | 97% | Yes |
| 1954 | 317 | 87% | No |
| 1955 | 320 | 88% | No |
| 1956 | 344 | 94% | Yes |
| 1957 | 355 | 97% | Yes |
| 1958 | 345 | 95% | Yes |
| 1959 | 334 | 92% | Yes |
| 1960 | 342 | 93% | Yes |
| 1961 | 300 | 82% | No |
| 1962 | 323 | 88% | No |
| 1963 | 329 | 90% | Yes |
| 1964 | 288 | 79% | No |
| 1965 | 266 | 73% | No |
| 1966 | 349 | 96% | Yes |
| 1967 | 355 | 97% | Yes |
| 1968 | 357 | 98% | Yes |
| 1969 | 358 | 98% | Yes |
| 1970 | 353 | 97% | Yes |
| 1971 | 357 | 98% | Yes |
| 1972 | 359 | 98% | Yes |
| 1973 | 358 | 98% | Yes |
| 1974 | 339 | 93% | Yes |
| 1975 | 210 | 58% | No |
| 1976 | 153 | 42% | No |
| 1977 | 362 | 99% | Yes |
| 1978 | 332 | 91% | Yes |
| 1979 | 361 | 99% | Yes |
| 1980 | 361 | 99% | Yes |
| 1981 | 364 | 100% | Yes |
| 1982 | 356 | 98% | Yes |
| 1983 | 358 | 98% | Yes |
| 1984 | 358 | 98% | Yes |
| 1985 | 355 | 97% | Yes |
| 1986 | 355 | 97% | Yes |
| 1987 | 360 | 99% | Yes |
| 1988 | 359 | 98% | Yes |
| 1989 | 359 | 98% | Yes |
| 1990 | 360 | 99% | Yes |
| 1991 | 330 | 90% | Yes |
| 1992 | 357 | 98% | Yes |
| 1993 | 359 | 98% | Yes |
| 1994 | 354 | 97% | Yes |
| 1995 | 355 | 97% | Yes |
| 1996 | 352 | 96% | Yes |
| 1997 | 352 | 96% | Yes |
| 1998 | 356 | 98% | Yes |
| 1999 | 356 | 98% | Yes |
| 2000 | 361 | 99% | Yes |
| 2001 | 357 | 98% | Yes |
| 2002 | 324 | 89% | No |
| 2003 | 338 | 93% | Yes |
| 2004 | 335 | 92% | Yes |
| 2005 | 306 | 84% | No |
| 2006 | 325 | 89% | No |
| 2007 | 352 | 96% | Yes |
| 2008 | 330 | 90% | Yes |
| 2009 | 365 | 100% | Yes |
| 2010 | 364 | 100% | Yes |
| 2011 | 365 | 100% | Yes |
| 2012 | 366 | 100% | Yes |
| 2013 | 363 | 99% | Yes |
| 2014 | 365 | 100% | Yes |
| 2015 | 365 | 100% | Yes |
| 2016 | 366 | 100% | Yes |
| 2017 | 364 | 100% | Yes |
| 2018 | 365 | 100% | Yes |
| 2019 | 365 | 100% | Yes |
| 2020 | 366 | 100% | Yes |
| 2021 | 365 | 100% | Yes |
| 2022 | 365 | 100% | Yes |
| 2023 | 361 | 99% | Yes |
| 2024 | 366 | 100% | Yes |
| 2025 | 363 | 99% | Yes |
| 2026 | 241 | 66% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 4 August 2026 | Bison, US | daily low min | 6.7 C (44.1 F) | 0.5 C (0.9 F) | 52 years | 26 of 100 (Routine) |
| 26 July 2026 | Bison, US | daily high min | 21.1 C (70.0 F) | 1.1 C (2.0 F) | 91 years | 40 of 100 (Notable) |
| 14 July 2026 | Bison, US | daily high max | 40.6 C (105.1 F) | 2.3 C (4.1 F) | 24 years | 22 of 100 (Routine) |
| 13 July 2026 | Bison, US | daily high min (Tie) | 20.6 C (69.1 F) | tie | 72 years | 7 of 100 (Routine) |
| 13 July 2026 | Bison, US | daily high max (Tie) | 39.4 C (102.9 F) | tie | 23 years | 4 of 100 (Routine) |
| 12 July 2026 | Bison, US | daily high max | 40.6 C (105.1 F) | 1.2 C (2.2 F) | 20 years | 18 of 100 (Routine) |
| 7 June 2026 | Bison, US | daily high min | 18.9 C (66.0 F) | 0.6 C (1.1 F) | 39 years | 22 of 100 (Routine) |
| 31 May 2026 | Bison, US | daily rain | 28.4 mm (1.1 in) | 1.5 mm (0.06 in) | 36 years | 22 of 100 (Routine) |
| 26 May 2026 | Bison, US | daily high min | 15.6 C (60.1 F) | 1.2 C (2.2 F) | 8 years | 14 of 100 (Routine) |
| 6 May 2026 | Bison, US | daily low min | -4.4 C (24.1 F) | 1.1 C (2.0 F) | 44 years | 25 of 100 (Routine) |
| 3 April 2026 | Bison, US | daily rain | 19.8 mm (0.8 in) | 9.4 mm (0.37 in) | 40 years | 20 of 100 (Routine) |
| 3 April 2026 | Bison, US | daily snowfall | 20.3 cm (8.0 in) | 8.9 cm (3.5 in) | 8 years | 26 of 100 (Routine) |
| 21 March 2026 | Bison, US | daily high max | 25.0 C (77.0 F) | 0.6 C (1.1 F) | 19 years | 15 of 100 (Routine) |
| 20 March 2026 | Bison, US | daily high min | 6.7 C (44.1 F) | 1.1 C (2.0 F) | 28 years | 19 of 100 (Routine) |
| 20 March 2026 | Bison, US | daily high max | 25.6 C (78.1 F) | 0.6 C (1.1 F) | 19 years | 15 of 100 (Routine) |
| 19 March 2026 | Bison, US | daily high max | 26.1 C (79.0 F) | 5.0 C (9.0 F) | 32 years | 24 of 100 (Routine) |
| 9 March 2026 | Bison, US | daily high max | 21.1 C (70.0 F) | 1.7 C (3.1 F) | 72 years | 32 of 100 (Routine) |
| 15 February 2026 | Bison, US | daily high max (Tie) | 13.3 C (55.9 F) | tie | 92 years | 9 of 100 (Routine) |
| 5 February 2026 | Bison, US | daily high min | 2.8 C (37.0 F) | 0.6 C (1.1 F) | 63 years | 28 of 100 (Routine) |
| 23 January 2026 | Bison, US | daily low min | -32.2 C (-26.0 F) | 1.6 C (2.9 F) | 63 years | 29 of 100 (Routine) |
Climate Trend
68 complete years, 1917 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1917 | 4.4 C | -2.79 C |
| 1918 | 6.4 C | -0.83 C |
| 1933 | 8.0 C | +0.78 C |
| 1936 | 6.7 C | -0.50 C |
| 1937 | 6.3 C | -0.91 C |
| 1938 | 8.0 C | +0.75 C |
| 1939 | 7.8 C | +0.60 C |
| 1941 | 8.1 C | +0.85 C |
| 1942 | 7.4 C | +0.17 C |
| 1950 | 4.2 C | -2.97 C |
| 1952 | 6.7 C | -0.55 C |
| 1953 | 7.3 C | +0.09 C |
| 1956 | 6.5 C | -0.69 C |
| 1957 | 6.4 C | -0.79 C |
| 1958 | 6.8 C | -0.39 C |
| 1959 | 6.3 C | -0.87 C |
| 1960 | 6.7 C | -0.52 C |
| 1966 | 6.2 C | -1.04 C |
| 1967 | 6.5 C | -0.70 C |
| 1968 | 6.4 C | -0.76 C |
| 1969 | 6.2 C | -0.98 C |
| 1970 | 6.0 C | -1.16 C |
| 1971 | 6.2 C | -1.04 C |
| 1972 | 5.8 C | -1.43 C |
| 1973 | 7.7 C | +0.53 C |
| 1977 | 6.9 C | -0.29 C |
| 1979 | 5.7 C | -1.51 C |
| 1980 | 7.5 C | +0.34 C |
| 1981 | 8.2 C | +1.01 C |
| 1982 | 5.3 C | -1.87 C |
| 1983 | 6.6 C | -0.62 C |
| 1984 | 6.4 C | -0.76 C |
| 1985 | 5.5 C | -1.69 C |
| 1986 | 7.5 C | +0.28 C |
| 1987 | 9.1 C | +1.91 C |
| 1988 | 8.6 C | +1.40 C |
| 1989 | 7.0 C | -0.17 C |
| 1990 | 8.5 C | +1.30 C |
| 1992 | 8.1 C | +0.90 C |
| 1993 | 5.9 C | -1.32 C |
| 1994 | 7.3 C | +0.12 C |
| 1995 | 7.4 C | +0.21 C |
| 1996 | 5.2 C | -1.99 C |
| 1997 | 7.5 C | +0.26 C |
| 1998 | 8.5 C | +1.31 C |
| 1999 | 9.1 C | +1.91 C |
| 2000 | 7.8 C | +0.56 C |
| 2001 | 8.4 C | +1.20 C |
| 2003 | 8.0 C | +0.76 C |
| 2004 | 7.9 C | +0.69 C |
| 2007 | 8.9 C | +1.72 C |
| 2009 | 6.1 C | -1.15 C |
| 2010 | 6.9 C | -0.28 C |
| 2011 | 7.1 C | -0.14 C |
| 2012 | 9.6 C | +2.42 C |
| 2013 | 7.0 C | -0.21 C |
| 2014 | 6.2 C | -0.97 C |
| 2015 | 8.8 C | +1.59 C |
| 2016 | 9.1 C | +1.87 C |
| 2017 | 8.0 C | +0.75 C |
| 2018 | 6.5 C | -0.75 C |
| 2019 | 5.5 C | -1.66 C |
| 2020 | 8.3 C | +1.12 C |
| 2021 | 9.3 C | +2.11 C |
| 2022 | 7.6 C | +0.40 C |
| 2023 | 8.6 C | +1.38 C |
| 2024 | 9.1 C | +1.92 C |
| 2025 | 8.2 C | +0.98 C |
The annual mean temperature here has risen by 0.2 C (0.1 to 0.3) per decade over 1917 to 2025. In Fahrenheit: 0.3 F (0.1 to 0.5) per decade. The slope is a straight line fitted to 68 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 (0.1 to 0.5) per decade | 1917 to 2025 | 68 | Rise |
| Mean daily maximum | 0.2 C (0.1 to 0.3) per decade | 0.3 F (0.1 to 0.5) per decade | 1917 to 2025 | 68 | Rise |
| Mean daily minimum | 0.2 C (0.1 to 0.3) per decade | 0.3 F (0.2 to 0.5) per decade | 1917 to 2025 | 68 | 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
1916 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 43.9 C (111.0 F) | 1936 | 38.9 C (102.0 F) | 102 |
| Coldest night (TNn) | -41.1 C (-42.0 F) | 1939 | -30.0 C (-22.0 F) | 102 |
| Wettest day (Rx1day) | 93.0 mm (3.7 in) | 2013 | 40.6 mm (1.6 in) | 102 |
| Wettest five days (Rx5day) | 139.3 mm (5.5 in) | 1962 | 62.8 mm (2.5 in) | 102 |
| Longest dry spell (CDD) | 124 days | 1952 | 39 days | 102 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1916 | 35.0 C (95.0 F) |
| 1917 | 38.9 C (102.0 F) |
| 1918 | 35.6 C (96.1 F) |
| 1919 | 40.0 C (104.0 F) |
| 1920 | 13.3 C (55.9 F) |
| 1921 | 28.3 C (82.9 F) |
| 1931 | 31.1 C (88.0 F) |
| 1932 | 38.9 C (102.0 F) |
| 1933 | 41.7 C (107.1 F) |
| 1934 | 41.7 C (107.1 F) |
| 1935 | 40.6 C (105.1 F) |
| 1936 | 43.9 C (111.0 F) |
| 1937 | 40.6 C (105.1 F) |
| 1938 | 40.0 C (104.0 F) |
| 1939 | 39.4 C (102.9 F) |
| 1940 | 40.0 C (104.0 F) |
| 1941 | 41.1 C (106.0 F) |
| 1942 | 37.8 C (100.0 F) |
| 1943 | 37.8 C (100.0 F) |
| 1944 | 33.3 C (91.9 F) |
| 1945 | 38.9 C (102.0 F) |
| 1946 | 36.1 C (97.0 F) |
| 1947 | 41.1 C (106.0 F) |
| 1948 | 40.6 C (105.1 F) |
| 1949 | 40.6 C (105.1 F) |
| 1950 | 35.6 C (96.1 F) |
| 1951 | 38.9 C (102.0 F) |
| 1952 | 40.0 C (104.0 F) |
| 1953 | 36.1 C (97.0 F) |
| 1954 | 38.9 C (102.0 F) |
| 1955 | 39.4 C (102.9 F) |
| 1956 | 37.8 C (100.0 F) |
| 1957 | 38.3 C (100.9 F) |
| 1958 | 41.1 C (106.0 F) |
| 1959 | 38.9 C (102.0 F) |
| 1960 | 41.7 C (107.1 F) |
| 1961 | 39.4 C (102.9 F) |
| 1962 | 37.2 C (99.0 F) |
| 1963 | 39.4 C (102.9 F) |
| 1964 | 39.4 C (102.9 F) |
| 1965 | 37.2 C (99.0 F) |
| 1966 | 38.9 C (102.0 F) |
| 1967 | 37.2 C (99.0 F) |
| 1968 | 38.3 C (100.9 F) |
| 1969 | 38.9 C (102.0 F) |
| 1970 | 40.0 C (104.0 F) |
| 1971 | 40.6 C (105.1 F) |
| 1972 | 37.8 C (100.0 F) |
| 1973 | 41.7 C (107.1 F) |
| 1974 | 40.0 C (104.0 F) |
| 1975 | 41.1 C (106.0 F) |
| 1976 | 38.9 C (102.0 F) |
| 1977 | 38.3 C (100.9 F) |
| 1978 | 37.8 C (100.0 F) |
| 1979 | 39.4 C (102.9 F) |
| 1980 | 40.6 C (105.1 F) |
| 1981 | 41.7 C (107.1 F) |
| 1982 | 36.1 C (97.0 F) |
| 1983 | 36.7 C (98.1 F) |
| 1984 | 38.3 C (100.9 F) |
| 1985 | 40.0 C (104.0 F) |
| 1986 | 37.8 C (100.0 F) |
| 1987 | 38.3 C (100.9 F) |
| 1988 | 39.4 C (102.9 F) |
| 1989 | 41.7 C (107.1 F) |
| 1990 | 38.9 C (102.0 F) |
| 1991 | 38.9 C (102.0 F) |
| 1992 | 35.0 C (95.0 F) |
| 1993 | 33.9 C (93.0 F) |
| 1994 | 36.7 C (98.1 F) |
| 1995 | 38.3 C (100.9 F) |
| 1996 | 36.7 C (98.1 F) |
| 1997 | 36.7 C (98.1 F) |
| 1998 | 37.8 C (100.0 F) |
| 1999 | 39.4 C (102.9 F) |
| 2000 | 40.0 C (104.0 F) |
| 2001 | 40.6 C (105.1 F) |
| 2002 | 43.3 C (109.9 F) |
| 2003 | 40.0 C (104.0 F) |
| 2004 | 38.9 C (102.0 F) |
| 2005 | 40.0 C (104.0 F) |
| 2006 | 42.8 C (109.0 F) |
| 2007 | 41.7 C (107.1 F) |
| 2008 | 36.1 C (97.0 F) |
| 2009 | 34.4 C (93.9 F) |
| 2010 | 39.4 C (102.9 F) |
| 2011 | 36.1 C (97.0 F) |
| 2012 | 40.0 C (104.0 F) |
| 2013 | 38.3 C (100.9 F) |
| 2014 | 34.4 C (93.9 F) |
| 2015 | 37.8 C (100.0 F) |
| 2016 | 37.8 C (100.0 F) |
| 2017 | 37.8 C (100.0 F) |
| 2018 | 37.8 C (100.0 F) |
| 2019 | 33.3 C (91.9 F) |
| 2020 | 36.1 C (97.0 F) |
| 2021 | 41.7 C (107.1 F) |
| 2022 | 38.3 C (100.9 F) |
| 2023 | 36.7 C (98.1 F) |
| 2024 | 40.6 C (105.1 F) |
| 2025 | 37.8 C (100.0 F) |
| 2026 | 40.6 C (105.1 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1916 | -33.9 C (-29.0 F) |
| 1917 | -37.8 C (-36.0 F) |
| 1918 | -35.0 C (-31.0 F) |
| 1919 | -33.9 C (-29.0 F) |
| 1920 | -27.8 C (-18.0 F) |
| 1921 | -18.3 C (-0.9 F) |
| 1931 | -18.9 C (-2.0 F) |
| 1932 | -31.7 C (-25.1 F) |
| 1933 | -37.8 C (-36.0 F) |
| 1934 | -28.3 C (-18.9 F) |
| 1935 | -25.6 C (-14.1 F) |
| 1936 | -38.9 C (-38.0 F) |
| 1937 | -29.4 C (-20.9 F) |
| 1938 | -29.4 C (-20.9 F) |
| 1939 | -41.1 C (-42.0 F) |
| 1940 | -34.4 C (-29.9 F) |
| 1941 | -27.8 C (-18.0 F) |
| 1942 | -31.1 C (-24.0 F) |
| 1943 | -36.1 C (-33.0 F) |
| 1944 | -35.6 C (-32.1 F) |
| 1945 | -32.2 C (-26.0 F) |
| 1946 | -27.8 C (-18.0 F) |
| 1947 | -20.6 C (-5.1 F) |
| 1948 | -31.1 C (-24.0 F) |
| 1949 | -25.6 C (-14.1 F) |
| 1950 | -32.8 C (-27.0 F) |
| 1951 | -33.9 C (-29.0 F) |
| 1952 | -28.3 C (-18.9 F) |
| 1953 | -27.2 C (-17.0 F) |
| 1954 | -34.4 C (-29.9 F) |
| 1955 | -28.9 C (-20.0 F) |
| 1956 | -28.9 C (-20.0 F) |
| 1957 | -29.4 C (-20.9 F) |
| 1958 | -28.9 C (-20.0 F) |
| 1959 | -27.2 C (-17.0 F) |
| 1960 | -30.0 C (-22.0 F) |
| 1961 | -26.1 C (-15.0 F) |
| 1962 | -30.6 C (-23.1 F) |
| 1963 | -33.9 C (-29.0 F) |
| 1964 | -33.3 C (-27.9 F) |
| 1965 | -27.8 C (-18.0 F) |
| 1966 | -32.8 C (-27.0 F) |
| 1967 | -32.8 C (-27.0 F) |
| 1968 | -32.2 C (-26.0 F) |
| 1969 | -29.4 C (-20.9 F) |
| 1970 | -31.1 C (-24.0 F) |
| 1971 | -29.4 C (-20.9 F) |
| 1972 | -33.9 C (-29.0 F) |
| 1973 | -28.9 C (-20.0 F) |
| 1974 | -21.1 C (-6.0 F) |
| 1975 | -29.4 C (-20.9 F) |
| 1976 | -28.3 C (-18.9 F) |
| 1977 | -33.9 C (-29.0 F) |
| 1978 | -32.8 C (-27.0 F) |
| 1979 | -31.7 C (-25.1 F) |
| 1980 | -33.3 C (-27.9 F) |
| 1981 | -30.0 C (-22.0 F) |
| 1982 | -33.3 C (-27.9 F) |
| 1983 | -36.7 C (-34.1 F) |
| 1984 | -30.6 C (-23.1 F) |
| 1985 | -33.3 C (-27.9 F) |
| 1986 | -26.1 C (-15.0 F) |
| 1987 | -20.0 C (-4.0 F) |
| 1988 | -31.1 C (-24.0 F) |
| 1989 | -36.1 C (-33.0 F) |
| 1990 | -35.0 C (-31.0 F) |
| 1991 | -26.7 C (-16.1 F) |
| 1992 | -29.4 C (-20.9 F) |
| 1993 | -28.3 C (-18.9 F) |
| 1994 | -32.8 C (-27.0 F) |
| 1995 | -27.2 C (-17.0 F) |
| 1996 | -33.9 C (-29.0 F) |
| 1997 | -30.6 C (-23.1 F) |
| 1998 | -31.7 C (-25.1 F) |
| 1999 | -27.2 C (-17.0 F) |
| 2000 | -27.2 C (-17.0 F) |
| 2001 | -26.1 C (-15.0 F) |
| 2002 | -23.9 C (-11.0 F) |
| 2003 | -28.3 C (-18.9 F) |
| 2004 | -30.0 C (-22.0 F) |
| 2005 | -31.1 C (-24.0 F) |
| 2006 | -27.8 C (-18.0 F) |
| 2007 | -27.2 C (-17.0 F) |
| 2008 | -30.0 C (-22.0 F) |
| 2009 | -28.3 C (-18.9 F) |
| 2010 | -28.3 C (-18.9 F) |
| 2011 | -28.9 C (-20.0 F) |
| 2012 | -24.4 C (-11.9 F) |
| 2013 | -31.1 C (-24.0 F) |
| 2014 | -31.1 C (-24.0 F) |
| 2015 | -25.6 C (-14.1 F) |
| 2016 | -28.9 C (-20.0 F) |
| 2017 | -30.6 C (-23.1 F) |
| 2018 | -32.2 C (-26.0 F) |
| 2019 | -30.0 C (-22.0 F) |
| 2020 | -28.3 C (-18.9 F) |
| 2021 | -32.2 C (-26.0 F) |
| 2022 | -31.7 C (-25.1 F) |
| 2023 | -27.8 C (-18.0 F) |
| 2024 | -34.4 C (-29.9 F) |
| 2025 | -32.8 C (-27.0 F) |
| 2026 | -32.2 C (-26.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1916 | 27.9 mm (1.1 in) |
| 1917 | 36.1 mm (1.4 in) |
| 1918 | 38.1 mm (1.5 in) |
| 1919 | 21.6 mm (0.9 in) |
| 1920 | 3.8 mm (0.15 in) |
| 1921 | 44.7 mm (1.8 in) |
| 1931 | 15.7 mm (0.6 in) |
| 1932 | 33.5 mm (1.3 in) |
| 1933 | 81.3 mm (3.2 in) |
| 1934 | 26.2 mm (1.0 in) |
| 1935 | 30.0 mm (1.2 in) |
| 1936 | 12.7 mm (0.5 in) |
| 1937 | 53.3 mm (2.1 in) |
| 1938 | 57.2 mm (2.3 in) |
| 1939 | 31.5 mm (1.2 in) |
| 1940 | 27.2 mm (1.1 in) |
| 1941 | 72.1 mm (2.8 in) |
| 1942 | 22.9 mm (0.9 in) |
| 1943 | 54.6 mm (2.1 in) |
| 1944 | 70.6 mm (2.8 in) |
| 1945 | 29.2 mm (1.1 in) |
| 1946 | 26.9 mm (1.1 in) |
| 1947 | 59.4 mm (2.3 in) |
| 1948 | 38.1 mm (1.5 in) |
| 1949 | 39.4 mm (1.6 in) |
| 1950 | 61.0 mm (2.4 in) |
| 1951 | 44.2 mm (1.7 in) |
| 1952 | 26.4 mm (1.0 in) |
| 1953 | 51.8 mm (2.0 in) |
| 1954 | 34.8 mm (1.4 in) |
| 1955 | 26.9 mm (1.1 in) |
| 1956 | 40.6 mm (1.6 in) |
| 1957 | 36.1 mm (1.4 in) |
| 1958 | 37.6 mm (1.5 in) |
| 1959 | 17.8 mm (0.7 in) |
| 1960 | 52.3 mm (2.1 in) |
| 1961 | 40.6 mm (1.6 in) |
| 1962 | 44.7 mm (1.8 in) |
| 1963 | 42.4 mm (1.7 in) |
| 1964 | 58.9 mm (2.3 in) |
| 1965 | 23.9 mm (0.9 in) |
| 1966 | 76.2 mm (3.0 in) |
| 1967 | 82.3 mm (3.2 in) |
| 1968 | 48.8 mm (1.9 in) |
| 1969 | 73.7 mm (2.9 in) |
| 1970 | 41.1 mm (1.6 in) |
| 1971 | 31.8 mm (1.3 in) |
| 1972 | 38.6 mm (1.5 in) |
| 1973 | 58.4 mm (2.3 in) |
| 1974 | 30.5 mm (1.2 in) |
| 1975 | 71.1 mm (2.8 in) |
| 1976 | 13.2 mm (0.5 in) |
| 1977 | 48.3 mm (1.9 in) |
| 1978 | 27.9 mm (1.1 in) |
| 1979 | 22.9 mm (0.9 in) |
| 1980 | 31.8 mm (1.3 in) |
| 1981 | 27.9 mm (1.1 in) |
| 1982 | 53.3 mm (2.1 in) |
| 1983 | 40.6 mm (1.6 in) |
| 1984 | 38.1 mm (1.5 in) |
| 1985 | 34.3 mm (1.4 in) |
| 1986 | 36.1 mm (1.4 in) |
| 1987 | 48.3 mm (1.9 in) |
| 1988 | 36.1 mm (1.4 in) |
| 1989 | 62.7 mm (2.5 in) |
| 1990 | 22.1 mm (0.9 in) |
| 1991 | 40.4 mm (1.6 in) |
| 1992 | 59.2 mm (2.3 in) |
| 1993 | 64.8 mm (2.6 in) |
| 1994 | 50.5 mm (2.0 in) |
| 1995 | 43.7 mm (1.7 in) |
| 1996 | 49.3 mm (1.9 in) |
| 1997 | 50.8 mm (2.0 in) |
| 1998 | 40.6 mm (1.6 in) |
| 1999 | 84.3 mm (3.3 in) |
| 2000 | 34.8 mm (1.4 in) |
| 2001 | 33.5 mm (1.3 in) |
| 2002 | 34.5 mm (1.4 in) |
| 2003 | 47.0 mm (1.9 in) |
| 2004 | 53.3 mm (2.1 in) |
| 2005 | 53.3 mm (2.1 in) |
| 2006 | 49.3 mm (1.9 in) |
| 2007 | 46.7 mm (1.8 in) |
| 2008 | 54.1 mm (2.1 in) |
| 2009 | 33.5 mm (1.3 in) |
| 2010 | 57.7 mm (2.3 in) |
| 2011 | 41.7 mm (1.6 in) |
| 2012 | 39.4 mm (1.6 in) |
| 2013 | 93.0 mm (3.7 in) |
| 2014 | 81.5 mm (3.2 in) |
| 2015 | 38.6 mm (1.5 in) |
| 2016 | 23.4 mm (0.9 in) |
| 2017 | 28.4 mm (1.1 in) |
| 2018 | 32.3 mm (1.3 in) |
| 2019 | 43.7 mm (1.7 in) |
| 2020 | 60.2 mm (2.4 in) |
| 2021 | 66.0 mm (2.6 in) |
| 2022 | 38.1 mm (1.5 in) |
| 2023 | 56.9 mm (2.2 in) |
| 2024 | 25.4 mm (1.0 in) |
| 2025 | 80.0 mm (3.1 in) |
| 2026 | 28.4 mm (1.1 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1916 | 48.2 mm (1.9 in) |
| 1917 | 46.0 mm (1.8 in) |
| 1918 | 61.4 mm (2.4 in) |
| 1919 | 27.2 mm (1.1 in) |
| 1920 | 3.8 mm (0.15 in) |
| 1921 | 61.2 mm (2.4 in) |
| 1931 | 15.0 mm (0.6 in) |
| 1932 | 44.5 mm (1.8 in) |
| 1933 | 88.7 mm (3.5 in) |
| 1934 | 31.3 mm (1.2 in) |
| 1935 | 47.8 mm (1.9 in) |
| 1936 | 14.8 mm (0.6 in) |
| 1937 | 65.5 mm (2.6 in) |
| 1938 | 71.9 mm (2.8 in) |
| 1939 | 41.0 mm (1.6 in) |
| 1940 | 43.7 mm (1.7 in) |
| 1941 | 137.9 mm (5.4 in) |
| 1942 | 43.3 mm (1.7 in) |
| 1943 | 68.0 mm (2.7 in) |
| 1944 | 120.9 mm (4.8 in) |
| 1945 | 43.5 mm (1.7 in) |
| 1946 | 57.9 mm (2.3 in) |
| 1947 | 103.8 mm (4.1 in) |
| 1948 | 55.6 mm (2.2 in) |
| 1949 | 45.2 mm (1.8 in) |
| 1950 | 61.0 mm (2.4 in) |
| 1951 | 71.4 mm (2.8 in) |
| 1952 | 69.0 mm (2.7 in) |
| 1953 | 74.9 mm (2.9 in) |
| 1954 | 55.8 mm (2.2 in) |
| 1955 | 50.2 mm (2.0 in) |
| 1956 | 46.9 mm (1.8 in) |
| 1957 | 73.1 mm (2.9 in) |
| 1958 | 68.3 mm (2.7 in) |
| 1959 | 36.7 mm (1.4 in) |
| 1960 | 64.3 mm (2.5 in) |
| 1961 | 52.8 mm (2.1 in) |
| 1962 | 139.3 mm (5.5 in) |
| 1963 | 59.9 mm (2.4 in) |
| 1964 | 106.7 mm (4.2 in) |
| 1965 | 36.6 mm (1.4 in) |
| 1966 | 90.2 mm (3.6 in) |
| 1967 | 85.6 mm (3.4 in) |
| 1968 | 63.0 mm (2.5 in) |
| 1969 | 120.5 mm (4.7 in) |
| 1970 | 89.9 mm (3.5 in) |
| 1971 | 61.0 mm (2.4 in) |
| 1972 | 53.4 mm (2.1 in) |
| 1973 | 66.3 mm (2.6 in) |
| 1974 | 39.1 mm (1.5 in) |
| 1975 | 81.3 mm (3.2 in) |
| 1976 | 13.7 mm (0.5 in) |
| 1977 | 77.4 mm (3.0 in) |
| 1978 | 51.6 mm (2.0 in) |
| 1979 | 34.6 mm (1.4 in) |
| 1980 | 51.6 mm (2.0 in) |
| 1981 | 82.9 mm (3.3 in) |
| 1982 | 97.0 mm (3.8 in) |
| 1983 | 47.7 mm (1.9 in) |
| 1984 | 76.2 mm (3.0 in) |
| 1985 | 34.3 mm (1.4 in) |
| 1986 | 90.4 mm (3.6 in) |
| 1987 | 72.8 mm (2.9 in) |
| 1988 | 39.7 mm (1.6 in) |
| 1989 | 102.3 mm (4.0 in) |
| 1990 | 36.8 mm (1.4 in) |
| 1991 | 44.6 mm (1.8 in) |
| 1992 | 74.7 mm (2.9 in) |
| 1993 | 98.9 mm (3.9 in) |
| 1994 | 62.5 mm (2.5 in) |
| 1995 | 92.5 mm (3.6 in) |
| 1996 | 84.4 mm (3.3 in) |
| 1997 | 63.5 mm (2.5 in) |
| 1998 | 71.6 mm (2.8 in) |
| 1999 | 89.8 mm (3.5 in) |
| 2000 | 55.1 mm (2.2 in) |
| 2001 | 64.5 mm (2.5 in) |
| 2002 | 40.1 mm (1.6 in) |
| 2003 | 57.2 mm (2.3 in) |
| 2004 | 73.9 mm (2.9 in) |
| 2005 | 82.8 mm (3.3 in) |
| 2006 | 70.4 mm (2.8 in) |
| 2007 | 64.5 mm (2.5 in) |
| 2008 | 76.4 mm (3.0 in) |
| 2009 | 47.5 mm (1.9 in) |
| 2010 | 64.1 mm (2.5 in) |
| 2011 | 69.7 mm (2.7 in) |
| 2012 | 48.2 mm (1.9 in) |
| 2013 | 93.0 mm (3.7 in) |
| 2014 | 81.5 mm (3.2 in) |
| 2015 | 62.5 mm (2.5 in) |
| 2016 | 60.4 mm (2.4 in) |
| 2017 | 38.6 mm (1.5 in) |
| 2018 | 56.7 mm (2.2 in) |
| 2019 | 71.9 mm (2.8 in) |
| 2020 | 70.4 mm (2.8 in) |
| 2021 | 116.0 mm (4.6 in) |
| 2022 | 45.8 mm (1.8 in) |
| 2023 | 113.5 mm (4.5 in) |
| 2024 | 31.5 mm (1.2 in) |
| 2025 | 81.8 mm (3.2 in) |
| 2026 | 39.3 mm (1.5 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1916 | 21 days |
| 1917 | 29 days |
| 1918 | 31 days |
| 1919 | 34 days |
| 1920 | 11 days |
| 1921 | 17 days |
| 1931 | 32 days |
| 1932 | 58 days |
| 1933 | 47 days |
| 1934 | 86 days |
| 1935 | 66 days |
| 1936 | 55 days |
| 1937 | 45 days |
| 1938 | 47 days |
| 1939 | 59 days |
| 1940 | 36 days |
| 1941 | 62 days |
| 1942 | 52 days |
| 1943 | 39 days |
| 1944 | 34 days |
| 1945 | 48 days |
| 1946 | 44 days |
| 1947 | 41 days |
| 1948 | 28 days |
| 1949 | 51 days |
| 1950 | 40 days |
| 1951 | 35 days |
| 1952 | 124 days |
| 1953 | 31 days |
| 1954 | 38 days |
| 1955 | 59 days |
| 1956 | 34 days |
| 1957 | 49 days |
| 1958 | 37 days |
| 1959 | 40 days |
| 1960 | 38 days |
| 1961 | 31 days |
| 1962 | 27 days |
| 1963 | 51 days |
| 1964 | 51 days |
| 1965 | 43 days |
| 1966 | 19 days |
| 1967 | 29 days |
| 1968 | 48 days |
| 1969 | 44 days |
| 1970 | 33 days |
| 1971 | 31 days |
| 1972 | 33 days |
| 1973 | 33 days |
| 1974 | 65 days |
| 1975 | 23 days |
| 1976 | 30 days |
| 1977 | 41 days |
| 1978 | 39 days |
| 1979 | 33 days |
| 1980 | 44 days |
| 1981 | 63 days |
| 1982 | 23 days |
| 1983 | 22 days |
| 1984 | 28 days |
| 1985 | 42 days |
| 1986 | 31 days |
| 1987 | 45 days |
| 1988 | 44 days |
| 1989 | 36 days |
| 1990 | 35 days |
| 1991 | 46 days |
| 1992 | 33 days |
| 1993 | 65 days |
| 1994 | 25 days |
| 1995 | 47 days |
| 1996 | 29 days |
| 1997 | 53 days |
| 1998 | 34 days |
| 1999 | 58 days |
| 2000 | 40 days |
| 2001 | 34 days |
| 2002 | 48 days |
| 2003 | 39 days |
| 2004 | 40 days |
| 2005 | 32 days |
| 2006 | 32 days |
| 2007 | 35 days |
| 2008 | 20 days |
| 2009 | 36 days |
| 2010 | 29 days |
| 2011 | 40 days |
| 2012 | 52 days |
| 2013 | 41 days |
| 2014 | 28 days |
| 2015 | 47 days |
| 2016 | 29 days |
| 2017 | 34 days |
| 2018 | 28 days |
| 2019 | 23 days |
| 2020 | 64 days |
| 2021 | 87 days |
| 2022 | 51 days |
| 2023 | 66 days |
| 2024 | 41 days |
| 2025 | 30 days |
| 2026 | 44 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
68 years with a frostAcross 68 years with a frost, the median last spring frost at Bison falls on 14 May and the median first autumn frost on 27 September, which leaves a median of 136 days between them.
In 1992 to 2025 the median growing season was 142 days. That is 9 days more than in 1917 to 1982.
Fitted over all years, the growing season changes by +2.0 days per decade at this station.
| Measure | Median, all years | Earliest period (1917 to 1982) | Recent period (1992 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 14 May | 14 May | 14 May | no change | -0.8 days per decade |
| First autumn frost | 27 September | 25 September | 3 October | 8 days later | +1.2 days per decade |
| Growing days | 136 days | 133 days | 142 days | 9 days more | +2.0 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
80 years, 1917 to 2025A day with at least 43.0 mm (1.7 in) of rain is expected about once in 2 years. A day with at least 99.1 mm (3.9 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 43.0 mm (1.7 in) | |
| 5 years | 58.5 mm (2.3 in) | |
| 10 years | 68.6 mm (2.7 in) | |
| 25 years | 81.1 mm (3.2 in) | |
| 50 years | 90.2 mm (3.6 in) | |
| 100 years | 99.1 mm (3.9 in) | Longer than the 80 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, 80 years of values from 1917 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: 93.0 mm (3.7 in) in 2013; 84.3 mm (3.3 in) in 1999; 82.3 mm (3.2 in) in 1967.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Climate Twins
2011 to 2025 against 1961 to 1990Over 2011 to 2025, Bison had a mean temperature of 7.9 C (46.3 F) and 452.4 mm (17.8 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Mission (United States, 286 km away), Harrington (United States, 280 km away) and Valentine Miller Fld AP (United States, 334 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Mission | United States | 286 km (178 mi) | 8.0 C (46.3 F) | 458.1 mm (18.0 in) | 0.97 |
| Harrington | United States | 280 km (174 mi) | 8.0 C (46.5 F) | 470.2 mm (18.5 in) | 0.99 |
| Valentine Miller Fld AP | United States | 334 km (208 mi) | 8.3 C (46.9 F) | 463.6 mm (18.3 in) | 1.09 |
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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-12).