Folsom Dam Threshold Days by Year
15 fixed thresholds counted per year at Folsom Dam (USC00043113): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Folsom Dam Thresholds
- Folsom Dam: days with a maximum temperature at or above 30 C (86 F) in 35 years, most in 1992 with 135.
- Folsom Dam: days with a maximum temperature at or above 35 C (95 F) in 35 years, most in 1984 with 70.
- Folsom Dam: days with a maximum temperature at or above 90 F (32.2 C) in 35 years, most in 1992 with 103.
- Folsom Dam: days with a maximum temperature at or above 100 F (37.8 C) in 35 years, most in 1988 with 37.
- 15 fixed thresholds have at least one qualifying day at Folsom Dam.
Days at or above 30 C (86 F)
35 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1956 | 110 | 108.3 |
| 1957 | 101 | 108.3 |
| 1958 | 111 | 108.3 |
| 1959 | 111 | 108.3 |
| 1960 | 109 | 103.1 |
| 1961 | 103 | 103.1 |
| 1962 | 96 | 103.1 |
| 1963 | 87 | 103.1 |
| 1964 | 102 | 103.1 |
| 1965 | 95 | 103.1 |
| 1966 | 108 | 103.1 |
| 1967 | 118 | 103.1 |
| 1968 | 107 | 103.1 |
| 1969 | 106 | 103.1 |
| 1970 | 113 | 104.8 |
| 1971 | 108 | 104.8 |
| 1972 | 104 | 104.8 |
| 1973 | 105 | 104.8 |
| 1974 | 118 | 104.8 |
| 1975 | 104 | 104.8 |
| 1976 | 87 | 104.8 |
| 1977 | 102 | 104.8 |
| 1978 | 99 | 104.8 |
| 1979 | 108 | 104.8 |
| 1980 | 93 | 105.1 |
| 1981 | 122 | 105.1 |
| 1982 | 97 | 105.1 |
| 1983 | 81 | 105.1 |
| 1984 | 121 | 105.1 |
| 1985 | 101 | 105.1 |
| 1988 | 119 | 105.1 |
| 1989 | 107 | 105.1 |
| 1990 | 118 | 126.7 |
| 1991 | 127 | 126.7 |
| 1992 | 135 | 126.7 |
| Year | First date | Last date |
|---|---|---|
| 1956 | 1956-05-16 | 1956-10-04 |
| 1957 | 1957-04-29 | 1957-09-25 |
| 1958 | 1958-05-05 | 1958-10-18 |
| 1959 | 1959-04-04 | 1959-10-26 |
| 1960 | 1960-05-11 | 1960-10-06 |
| 1961 | 1961-06-11 | 1961-10-19 |
| 1962 | 1962-04-13 | 1962-10-02 |
| 1963 | 1963-05-18 | 1963-10-04 |
| 1964 | 1964-04-15 | 1964-10-23 |
| 1965 | 1965-04-27 | 1965-10-27 |
| 1966 | 1966-04-01 | 1966-11-03 |
| 1967 | 1967-05-17 | 1967-10-20 |
| 1968 | 1968-04-28 | 1968-10-28 |
| 1969 | 1969-05-06 | 1969-10-02 |
| 1970 | 1970-05-03 | 1970-10-04 |
| 1971 | 1971-05-25 | 1971-10-14 |
| 1972 | 1972-05-02 | 1972-10-08 |
| 1973 | 1973-04-27 | 1973-10-17 |
| 1974 | 1974-05-08 | 1974-10-19 |
| 1975 | 1975-05-13 | 1975-10-06 |
| 1976 | 1976-05-12 | 1976-10-15 |
| 1977 | 1977-04-13 | 1977-10-16 |
| 1978 | 1978-05-14 | 1978-10-15 |
| 1979 | 1979-05-13 | 1979-10-06 |
| 1980 | 1980-05-05 | 1980-10-10 |
| 1981 | 1981-04-29 | 1981-10-01 |
| 1982 | 1982-05-04 | 1982-10-15 |
| 1983 | 1983-05-18 | 1983-10-27 |
| 1984 | 1984-05-09 | 1984-10-08 |
| 1985 | 1985-04-14 | 1985-10-06 |
| 1988 | 1988-03-27 | 1988-10-21 |
| 1989 | 1989-04-07 | 1989-10-20 |
| 1990 | 1990-04-13 | 1990-10-25 |
| 1991 | 1991-05-24 | 1991-10-22 |
| 1992 | 1992-04-26 | 1992-10-14 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 35 | 135 | 1992 | 135 |
| 35 C (95 F): Days | 35 | 70 | 1984 | 55 |
| 40 C (104 F): Days | 34 | 16 | 1990 | 10 |
| 45 C (113 F): Days | 2 | 2 | 1972 | 1 |
| 90 F (32.2 C): Days | 35 | 103 | 1992 | 103 |
| 100 F (37.8 C): Days | 35 | 37 | 1988 | 23 |
| 110 F (43.3 C): Days | 6 | 5 | 1961 | 2 |
| 0 C (32 F): Ice days (max | 3 | 1 | 1961 | 1 |
| 0 C (32 F): Frost days (min | 34 | 34 | 1985 | 11 |
| 20 C (68 F): Tropical nights (min | 35 | 21 | 1984 | 8 |
| 25 C (77 F): Days with min | 6 | 1 | 1957 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 35 | 40 | 1983 | 20 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 35 | 16 | 1982 | 8 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 14 | 4 | 1983 | 1 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 1 | 1 | 1962 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1956.
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 (2025-12-31).