South Mountain Threshold Days by Year (CA006107955)
14 fixed thresholds counted per year at South Mountain (CA006107955): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for South Mountain Thresholds
- South Mountain: days with 10 mm (0.39 in) or more of precipitation in 23 years, most in 1972 with 39.
- South Mountain: days with 25 mm (0.98 in) or more of precipitation in 23 years, most in 1973 with 10.
- South Mountain: days with 10 cm (3.9 in) or more of snowfall in 23 years, most in 1968 with 11.
- South Mountain: days with a maximum temperature at or above 30 C (86 F) in 22 years, most in 1975 with 30.
- 14 fixed thresholds have at least one qualifying day at South Mountain.
Days at or above 30 C (86 F)
22 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1962 | 9 | 9.8 |
| 1963 | 19 | 9.8 |
| 1964 | 9 | 9.8 |
| 1965 | 8 | 9.8 |
| 1966 | 13 | 9.8 |
| 1967 | 4 | 9.8 |
| 1968 | 7 | 9.8 |
| 1969 | 9 | 9.8 |
| 1970 | 13 | 13 |
| 1971 | 10 | 13 |
| 1972 | 4 | 13 |
| 1973 | 15 | 13 |
| 1974 | 7 | 13 |
| 1975 | 30 | 13 |
| 1976 | 8 | 13 |
| 1977 | 14 | 13 |
| 1978 | 17 | 13 |
| 1979 | 12 | 13 |
| 1980 | 7 | 12.5 |
| 1981 | 6 | 12.5 |
| 1982 | 7 | 12.5 |
| 1983 | 30 | 12.5 |
| Year | First date | Last date |
|---|---|---|
| 1962 | 1962-05-16 | 1962-09-01 |
| 1963 | 1963-06-04 | 1963-07-28 |
| 1964 | 1964-06-20 | 1964-07-28 |
| 1965 | 1965-05-26 | 1965-09-22 |
| 1966 | 1966-06-23 | 1966-08-09 |
| 1967 | 1967-06-03 | 1967-06-15 |
| 1968 | 1968-07-01 | 1968-07-22 |
| 1969 | 1969-06-12 | 1969-08-31 |
| 1970 | 1970-06-02 | 1970-08-16 |
| 1971 | 1971-05-19 | 1971-08-19 |
| 1972 | 1972-05-23 | 1972-07-21 |
| 1973 | 1973-06-11 | 1973-09-05 |
| 1974 | 1974-06-10 | 1974-08-21 |
| 1975 | 1975-05-20 | 1975-08-26 |
| 1976 | 1976-06-08 | 1976-08-22 |
| 1977 | 1977-05-17 | 1977-09-01 |
| 1978 | 1978-05-25 | 1978-08-19 |
| 1979 | 1979-05-09 | 1979-08-02 |
| 1980 | 1980-06-24 | 1980-08-24 |
| 1981 | 1981-06-16 | 1981-07-11 |
| 1982 | 1982-07-07 | 1982-07-22 |
| 1983 | 1983-06-12 | 1983-09-20 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 22 | 30 | 1975 | 30 |
| 35 C (95 F): Days | 2 | 2 | 1975 | 2 |
| 90 F (32.2 C): Days | 15 | 12 | 1975 | 7 |
| 0 C (32 F): Ice days (max | 22 | 96 | 1978 | 70 |
| 0 C (32 F): Frost days (min | 22 | 181 | 1978 | 161 |
| -10 C (14 F): Days with min | 22 | 96 | 1978 | 61 |
| -20 C (-4 F): Days with min | 22 | 36 | 1968 | 14 |
| -30 C (-22 F): Days with min | 19 | 6 | 1968 | 3 |
| 20 C (68 F): Tropical nights (min | 22 | 17 | 1973 | 9 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 23 | 39 | 1972 | 35 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 23 | 10 | 1973 | 3 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 11 | 1 | 1963 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 23 | 11 | 1968 | 5 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 5 | 2 | 1966 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1962.
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 (2026-10-17).