Afton Threshold Days by Year (USC00480027)
14 fixed thresholds counted per year at Afton (USC00480027): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Afton Thresholds
- Afton: days with 10 mm (0.39 in) or more of precipitation in 55 years, most in 2023 with 22.
- Afton: nights with a minimum temperature at or below 0 C (32 F) in 50 years, most in 1974 with 275.
- Afton: nights with a minimum temperature at or below -10 C (14 F) in 50 years, most in 1976 with 121.
- Afton: nights with a minimum temperature at or below -20 C (-4 F) in 50 years, most in 1960 with 37.
- 14 fixed thresholds have at least one qualifying day at Afton.
Days at or above 30 C (86 F)
46 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1958 | 11 | 11 |
| 1959 | 11 | 11 |
| 1960 | 19 | 13.2 |
| 1961 | 20 | 13.2 |
| 1962 | 5 | 13.2 |
| 1963 | 12 | 13.2 |
| 1964 | 17 | 13.2 |
| 1965 | 2 | 13.2 |
| 1966 | 22 | 13.2 |
| 1967 | 24 | 13.2 |
| 1968 | 8 | 13.2 |
| 1969 | 3 | 13.2 |
| 1970 | 15 | 18 |
| 1971 | 9 | 18 |
| 1972 | 22 | 18 |
| 1974 | 34 | 18 |
| 1975 | 9 | 18 |
| 1976 | 19 | 18 |
| 1980 | 2 | 11.6 |
| 1981 | 3 | 11.6 |
| 1982 | 8 | 11.6 |
| 1983 | 6 | 11.6 |
| 1986 | 6 | 11.6 |
| 1987 | 7 | 11.6 |
| 1988 | 49 | 11.6 |
| 1990 | 49 | 21.9 |
| 1991 | 13 | 21.9 |
| 1992 | 21 | 21.9 |
| 1994 | 28 | 21.9 |
| 1995 | 12 | 21.9 |
| 1996 | 19 | 21.9 |
| 1997 | 11 | 21.9 |
| 2012 | 25 | 18.5 |
| 2013 | 23 | 18.5 |
| 2014 | 14 | 18.5 |
| 2015 | 11 | 18.5 |
| 2016 | 22 | 18.5 |
| 2017 | 23 | 18.5 |
| 2018 | 15 | 18.5 |
| 2019 | 15 | 18.5 |
| 2020 | 14 | 16.8 |
| 2021 | 24 | 16.8 |
| 2022 | 21 | 16.8 |
| 2023 | 10 | 16.8 |
| 2024 | 14 | 16.8 |
| 2025 | 18 | 16.8 |
| Year | First date | Last date |
|---|---|---|
| 1958 | 1958-08-02 | 1958-08-26 |
| 1959 | 1959-07-18 | 1959-09-10 |
| 1960 | 1960-07-09 | 1960-08-21 |
| 1961 | 1961-06-19 | 1961-08-23 |
| 1962 | 1962-07-11 | 1962-08-16 |
| 1963 | 1963-07-03 | 1963-09-12 |
| 1964 | 1964-07-08 | 1964-08-18 |
| 1965 | 1965-08-08 | 1965-08-09 |
| 1966 | 1966-06-28 | 1966-08-26 |
| 1967 | 1967-07-12 | 1967-09-11 |
| 1968 | 1968-06-18 | 1968-08-12 |
| 1969 | 1969-07-13 | 1969-07-28 |
| 1970 | 1970-06-27 | 1970-08-26 |
| 1971 | 1971-07-15 | 1971-08-15 |
| 1972 | 1972-07-29 | 1972-08-29 |
| 1974 | 1974-06-12 | 1974-08-31 |
| 1975 | 1975-07-04 | 1975-08-05 |
| 1976 | 1976-06-30 | 1976-09-06 |
| 1980 | 1980-07-22 | 1980-07-23 |
| 1981 | 1981-06-25 | 1981-06-30 |
| 1982 | 1982-07-21 | 1982-08-22 |
| 1983 | 1983-07-05 | 1983-08-11 |
| 1986 | 1986-06-25 | 1986-08-18 |
| 1987 | 1987-06-27 | 1987-09-25 |
| 1988 | 1988-06-04 | 1988-09-10 |
| 1990 | 1990-06-23 | 1990-09-16 |
| 1991 | 1991-07-05 | 1991-08-23 |
| 1992 | 1992-06-23 | 1992-08-21 |
| 1994 | 1994-06-20 | 1994-08-27 |
| 1995 | 1995-07-07 | 1995-09-03 |
| 1996 | 1996-07-02 | 1996-08-31 |
| 1997 | 1997-07-10 | 1997-08-30 |
| 2012 | 2012-06-24 | 2012-08-29 |
| 2013 | 2013-06-28 | 2013-08-21 |
| 2014 | 2014-07-07 | 2014-08-13 |
| 2015 | 2015-06-27 | 2015-08-26 |
| 2016 | 2016-06-21 | 2016-09-01 |
| 2017 | 2017-06-21 | 2017-09-05 |
| 2018 | 2018-07-06 | 2018-08-13 |
| 2019 | 2019-07-12 | 2019-09-05 |
| 2020 | 2020-07-18 | 2020-09-06 |
| 2021 | 2021-06-14 | 2021-09-10 |
| 2022 | 2022-07-09 | 2022-09-08 |
| 2023 | 2023-07-17 | 2023-08-18 |
| 2024 | 2024-06-24 | 2024-08-07 |
| 2025 | 2025-06-20 | 2025-08-24 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 46 | 49 | 1988 | 18 |
| 35 C (95 F): Days | 3 | 2 | 1990 | 2 |
| 90 F (32.2 C): Days | 32 | 17 | 1990 | 4 |
| 0 C (32 F): Ice days (max | 48 | 102 | 2022 | 28 |
| 0 C (32 F): Frost days (min | 50 | 275 | 1974 | 131 |
| -10 C (14 F): Days with min | 50 | 121 | 1976 | 37 |
| -20 C (-4 F): Days with min | 50 | 37 | 1960 | 3 |
| -30 C (-22 F): Days with min | 32 | 9 | 1972 | 2 |
| -40 C (-40 F): Days with min | 2 | 1 | 1974 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 55 | 22 | 2023 | 4 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 30 | 3 | 1982 | 1 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 2 | 0 | n/a | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 42 | 15 | 1996 | 1 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 6 | 3 | 1996 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1958.
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 2026-10-17 (17 October 2026). Threshold counts are computed by this site.
Data as of . Last revised (2026-10-12).