Tonsina Threshold Days by Year (USC00509385)
14 fixed thresholds counted per year at Tonsina (USC00509385): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Tonsina Thresholds
- Tonsina: days with a maximum temperature at or below 0 C (32 F) in 39 years, most in 1972 with 157.
- Tonsina: nights with a minimum temperature at or below 0 C (32 F) in 38 years, most in 1975 with 287.
- Tonsina: nights with a minimum temperature at or below -10 C (14 F) in 38 years, most in 1972 with 187.
- Tonsina: nights with a minimum temperature at or below -20 C (-4 F) in 38 years, most in 1972 with 126.
- 14 fixed thresholds have at least one qualifying day at Tonsina.
Days at or above 30 C (86 F)
14 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1969 | 3 | 3 |
| 1971 | 1 | 1 |
| 1972 | 1 | 1 |
| 1975 | 1 | 1 |
| 1976 | 1 | 1 |
| 1978 | 1 | 1 |
| 1989 | 1 | 1 |
| 1990 | 1 | 1.2 |
| 1991 | 1 | 1.2 |
| 1992 | 1 | 1.2 |
| 1993 | 2 | 1.2 |
| 1994 | 1 | 1.2 |
| 2009 | 1 | 1 |
| 2013 | 4 | 4 |
| Year | First date | Last date |
|---|---|---|
| 1969 | 1969-06-14 | 1969-06-16 |
| 1971 | 1971-06-24 | 1971-06-24 |
| 1972 | 1972-07-07 | 1972-07-07 |
| 1975 | 1975-07-11 | 1975-07-11 |
| 1976 | 1976-08-02 | 1976-08-02 |
| 1978 | 1978-08-02 | 1978-08-02 |
| 1989 | 1989-07-12 | 1989-07-12 |
| 1990 | 1990-07-24 | 1990-07-24 |
| 1991 | 1991-06-22 | 1991-06-22 |
| 1992 | 1992-07-03 | 1992-07-03 |
| 1993 | 1993-07-16 | 1993-07-17 |
| 1994 | 1994-08-05 | 1994-08-05 |
| 2009 | 2009-07-09 | 2009-07-09 |
| 2013 | 2013-06-17 | 2013-06-27 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 14 | 4 | 2013 | 4 |
| 90 F (32.2 C): Days | 2 | 1 | 1969 | 1 |
| 0 C (32 F): Ice days (max | 39 | 157 | 1972 | 115 |
| 0 C (32 F): Frost days (min | 38 | 287 | 1975 | 222 |
| -10 C (14 F): Days with min | 38 | 187 | 1972 | 127 |
| -20 C (-4 F): Days with min | 38 | 126 | 1972 | 65 |
| -30 C (-22 F): Days with min | 38 | 64 | 1974 | 11 |
| -40 C (-40 F): Days with min | 28 | 23 | 1975 | 7 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 37 | 14 | 2013 | 14 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 21 | 4 | 1968 | 1 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 1 | 1 | 1981 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 32 | 9 | 1964 | 6 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 12 | 2 | 1978 | 1 |
| 50 cm (19.7 in): Days with 50 cm or more snowfall | 1 | 1 | 1976 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1969.
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 (2025-12-31).