Sonoma Threshold Days by Year (USC00048351)
15 fixed thresholds counted per year at Sonoma (USC00048351): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Sonoma Thresholds
- Sonoma: days with 10 mm (0.39 in) or more of precipitation in 77 years, most in 1973 with 41.
- Sonoma: days with 25 mm (0.98 in) or more of precipitation in 75 years, most in 1982 with 15.
- Sonoma: nights with a minimum temperature at or below 0 C (32 F) in 73 years, most in 1976 with 76.
- Sonoma: days with 50 mm (1.97 in) or more of precipitation in 56 years, most in 1970 with 5.
- 15 fixed thresholds have at least one qualifying day at Sonoma.
Days at or above 30 C (86 F)
50 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1905 | 29 | 29 |
| 1952 | 73 | 72.5 |
| 1953 | 62 | 72.5 |
| 1954 | 57 | 72.5 |
| 1955 | 65 | 72.5 |
| 1956 | 59 | 72.5 |
| 1957 | 77 | 72.5 |
| 1958 | 88 | 72.5 |
| 1959 | 99 | 72.5 |
| 1960 | 77 | 83.1 |
| 1961 | 83 | 83.1 |
| 1962 | 77 | 83.1 |
| 1963 | 70 | 83.1 |
| 1964 | 81 | 83.1 |
| 1965 | 72 | 83.1 |
| 1966 | 89 | 83.1 |
| 1967 | 107 | 83.1 |
| 1968 | 89 | 83.1 |
| 1969 | 86 | 83.1 |
| 1970 | 96 | 103.2 |
| 1971 | 83 | 103.2 |
| 1972 | 109 | 103.2 |
| 1973 | 115 | 103.2 |
| 1974 | 119 | 103.2 |
| 1975 | 104 | 103.2 |
| 1976 | 98 | 103.2 |
| 1977 | 97 | 103.2 |
| 1978 | 108 | 103.2 |
| 1980 | 81 | 76.5 |
| 1981 | 100 | 76.5 |
| 1982 | 72 | 76.5 |
| 1986 | 50 | 76.5 |
| 1988 | 86 | 76.5 |
| 1989 | 70 | 76.5 |
| 1990 | 85 | 79.7 |
| 1991 | 67 | 79.7 |
| 1992 | 87 | 79.7 |
| 2013 | 47 | 60.5 |
| 2014 | 61 | 60.5 |
| 2015 | 66 | 60.5 |
| 2016 | 62 | 60.5 |
| 2018 | 63 | 60.5 |
| 2019 | 64 | 60.5 |
| 2020 | 90 | 71.3 |
| 2021 | 68 | 71.3 |
| 2022 | 81 | 71.3 |
| 2023 | 62 | 71.3 |
| 2024 | 82 | 71.3 |
| 2025 | 55 | 71.3 |
| 2026 | 61 | 71.3 |
| Year | First date | Last date |
|---|---|---|
| 1905 | 1905-05-15 | 1905-10-11 |
| 1952 | 1952-03-25 | 1952-10-05 |
| 1953 | 1953-05-04 | 1953-10-08 |
| 1954 | 1954-04-15 | 1954-10-15 |
| 1955 | 1955-05-10 | 1955-11-10 |
| 1956 | 1956-05-15 | 1956-10-01 |
| 1957 | 1957-04-27 | 1957-09-23 |
| 1958 | 1958-05-14 | 1958-10-16 |
| 1959 | 1959-04-23 | 1959-10-25 |
| 1960 | 1960-04-04 | 1960-10-16 |
| 1961 | 1961-04-03 | 1961-10-17 |
| 1962 | 1962-04-06 | 1962-10-02 |
| 1963 | 1963-05-16 | 1963-10-02 |
| 1964 | 1964-04-13 | 1964-10-22 |
| 1965 | 1965-04-25 | 1965-10-30 |
| 1966 | 1966-03-31 | 1966-11-02 |
| 1967 | 1967-05-07 | 1967-11-01 |
| 1968 | 1968-04-26 | 1968-10-27 |
| 1969 | 1969-05-05 | 1969-10-01 |
| 1970 | 1970-03-25 | 1970-10-10 |
| 1971 | 1971-06-14 | 1971-10-13 |
| 1972 | 1972-03-16 | 1972-10-07 |
| 1973 | 1973-04-07 | 1973-10-31 |
| 1974 | 1974-04-29 | 1974-10-21 |
| 1975 | 1975-05-12 | 1975-10-21 |
| 1976 | 1976-04-30 | 1976-11-04 |
| 1977 | 1977-04-15 | 1977-10-15 |
| 1978 | 1978-04-09 | 1978-11-08 |
| 1980 | 1980-05-17 | 1980-10-09 |
| 1981 | 1981-04-22 | 1981-10-24 |
| 1982 | 1982-05-15 | 1982-10-14 |
| 1986 | 1986-04-21 | 1986-10-08 |
| 1988 | 1988-03-26 | 1988-10-19 |
| 1989 | 1989-04-05 | 1989-10-18 |
| 1990 | 1990-04-13 | 1990-10-12 |
| 1991 | 1991-05-24 | 1991-10-21 |
| 1992 | 1992-04-28 | 1992-10-09 |
| 2013 | 2013-04-12 | 2013-09-19 |
| 2014 | 2014-04-30 | 2014-10-13 |
| 2015 | 2015-04-30 | 2015-10-30 |
| 2016 | 2016-04-06 | 2016-10-09 |
| 2018 | 2018-05-28 | 2018-10-09 |
| 2019 | 2019-04-22 | 2019-10-28 |
| 2020 | 2020-04-25 | 2020-10-22 |
| 2021 | 2021-05-03 | 2021-10-05 |
| 2022 | 2022-03-22 | 2022-10-20 |
| 2023 | 2023-04-27 | 2023-10-19 |
| 2024 | 2024-05-10 | 2024-10-23 |
| 2025 | 2025-05-09 | 2025-10-07 |
| 2026 | 2026-03-17 | 2026-09-30 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 50 | 119 | 1974 | 61 |
| 35 C (95 F): Days | 50 | 56 | 1974 | 12 |
| 40 C (104 F): Days | 36 | 12 | 1977 | 4 |
| 45 C (113 F): Days | 1 | 2 | 1972 | 2 |
| 90 F (32.2 C): Days | 50 | 96 | 1974 | 29 |
| 100 F (37.8 C): Days | 47 | 25 | 1973 | 3 |
| 110 F (43.3 C): Days | 8 | 3 | 1972 | 1 |
| 0 C (32 F): Frost days (min | 73 | 76 | 1976 | 4 |
| -10 C (14 F): Days with min | 1 | 1 | 1990 | 1 |
| 20 C (68 F): Tropical nights (min | 15 | 2 | 2022 | 1 |
| 25 C (77 F): Days with min | 1 | 0 | n/a | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 77 | 41 | 1973 | 11 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 75 | 15 | 1982 | 2 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 56 | 5 | 1970 | 1 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 7 | 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 1905.
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).