Thornbury Slama Threshold Days by Year
14 fixed thresholds counted per year at Thornbury Slama (CA00611HBEC): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Thornbury Slama Thresholds
- Thornbury Slama: days with a maximum temperature at or above 30 C (86 F) in 15 years, most in 1983 with 20.
- Thornbury Slama: days with a maximum temperature at or below 0 C (32 F) in 15 years, most in 1978 with 90.
- Thornbury Slama: nights with a minimum temperature at or below 0 C (32 F) in 15 years, most in 1972 with 167.
- Thornbury Slama: nights with a minimum temperature at or below -10 C (14 F) in 15 years, most in 1970 with 66.
- 14 fixed thresholds have at least one qualifying day at Thornbury Slama.
Days at or above 30 C (86 F)
15 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1969 | 7 | 7 |
| 1970 | 6 | 8.3 |
| 1971 | 7 | 8.3 |
| 1972 | 4 | 8.3 |
| 1973 | 18 | 8.3 |
| 1974 | 7 | 8.3 |
| 1975 | 12 | 8.3 |
| 1976 | 7 | 8.3 |
| 1977 | 9 | 8.3 |
| 1978 | 8 | 8.3 |
| 1979 | 5 | 8.3 |
| 1980 | 1 | 7.3 |
| 1981 | 3 | 7.3 |
| 1982 | 5 | 7.3 |
| 1983 | 20 | 7.3 |
| Year | First date | Last date |
|---|---|---|
| 1969 | 1969-06-26 | 1969-08-31 |
| 1970 | 1970-06-10 | 1970-09-21 |
| 1971 | 1971-06-19 | 1971-08-10 |
| 1972 | 1972-07-12 | 1972-08-24 |
| 1973 | 1973-06-10 | 1973-09-04 |
| 1974 | 1974-07-04 | 1974-08-22 |
| 1975 | 1975-05-20 | 1975-08-25 |
| 1976 | 1976-06-10 | 1976-08-21 |
| 1977 | 1977-05-17 | 1977-08-28 |
| 1978 | 1978-05-30 | 1978-08-13 |
| 1979 | 1979-06-07 | 1979-09-01 |
| 1980 | 1980-07-15 | 1980-07-15 |
| 1981 | 1981-06-15 | 1981-07-08 |
| 1982 | 1982-07-06 | 1982-09-13 |
| 1983 | 1983-06-13 | 1983-09-10 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 15 | 20 | 1983 | 20 |
| 35 C (95 F): Days | 1 | 1 | 1977 | 1 |
| 90 F (32.2 C): Days | 9 | 4 | 1983 | 4 |
| 0 C (32 F): Ice days (max | 15 | 90 | 1978 | 66 |
| 0 C (32 F): Frost days (min | 15 | 167 | 1972 | 154 |
| -10 C (14 F): Days with min | 15 | 66 | 1970 | 39 |
| -20 C (-4 F): Days with min | 15 | 12 | 1979 | 4 |
| -30 C (-22 F): Days with min | 2 | 2 | 1979 | 2 |
| 20 C (68 F): Tropical nights (min | 15 | 16 | 1973 | 10 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 15 | 29 | 1976 | 29 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 15 | 7 | 1974 | 3 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 4 | 2 | 1980 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 15 | 9 | 1979 | 6 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 1 | 1 | 1979 | 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 2026-10-14 (14 October 2026). Threshold counts are computed by this site.
Data as of . Last revised (2026-10-14).