San Francisco Dwtn Threshold Days by Year (USW00023272)
11 fixed thresholds counted per year at San Francisco Dwtn (USW00023272): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for San Francisco Dwtn Thresholds
- San Francisco Dwtn: days with 10 mm (0.39 in) or more of precipitation in 106 years, most in 1983 with 42.
- San Francisco Dwtn: days with 25 mm (0.98 in) or more of precipitation in 105 years, most in 1998 with 12.
- San Francisco Dwtn: days with a maximum temperature at or above 30 C (86 F) in 100 years, most in 2003 with 16.
- San Francisco Dwtn: days with a maximum temperature at or above 90 F (32.2 C) in 73 years, most in 1984 with 9.
- 11 fixed thresholds have at least one qualifying day at San Francisco Dwtn.
Days at or above 30 C (86 F)
100 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1921 | 7 | 4.2 |
| 1922 | 2 | 4.2 |
| 1923 | 2 | 4.2 |
| 1924 | 5 | 4.2 |
| 1925 | 2 | 4.2 |
| 1926 | 5 | 4.2 |
| 1927 | 5 | 4.2 |
| 1928 | 4 | 4.2 |
| 1929 | 6 | 4.2 |
| 1930 | 2 | 5.1 |
| 1931 | 10 | 5.1 |
| 1932 | 3 | 5.1 |
| 1933 | 5 | 5.1 |
| 1934 | 7 | 5.1 |
| 1935 | 4 | 5.1 |
| 1936 | 4 | 5.1 |
| 1937 | 5 | 5.1 |
| 1938 | 1 | 5.1 |
| 1939 | 10 | 5.1 |
| 1941 | 3 | 3.8 |
| 1942 | 3 | 3.8 |
| 1943 | 7 | 3.8 |
| 1944 | 2 | 3.8 |
| 1945 | 2 | 3.8 |
| 1946 | 5 | 3.8 |
| 1947 | 5 | 3.8 |
| 1949 | 3 | 3.8 |
| 1950 | 3 | 3.6 |
| 1951 | 4 | 3.6 |
| 1952 | 5 | 3.6 |
| 1953 | 4 | 3.6 |
| 1954 | 4 | 3.6 |
| 1955 | 1 | 3.6 |
| 1956 | 2 | 3.6 |
| 1957 | 3 | 3.6 |
| 1958 | 6 | 3.6 |
| 1959 | 4 | 3.6 |
| 1960 | 3 | 4.1 |
| 1961 | 5 | 4.1 |
| 1962 | 2 | 4.1 |
| 1963 | 3 | 4.1 |
| 1964 | 7 | 4.1 |
| 1965 | 5 | 4.1 |
| 1966 | 5 | 4.1 |
| 1967 | 4 | 4.1 |
| 1968 | 3 | 4.1 |
| 1970 | 9 | 6.1 |
| 1971 | 5 | 6.1 |
| 1972 | 3 | 6.1 |
| 1973 | 6 | 6.1 |
| 1974 | 4 | 6.1 |
| 1975 | 3 | 6.1 |
| 1976 | 11 | 6.1 |
| 1978 | 10 | 6.1 |
| 1979 | 4 | 6.1 |
| 1980 | 6 | 7.3 |
| 1981 | 2 | 7.3 |
| 1982 | 1 | 7.3 |
| 1983 | 11 | 7.3 |
| 1984 | 13 | 7.3 |
| 1985 | 8 | 7.3 |
| 1986 | 2 | 7.3 |
| 1987 | 12 | 7.3 |
| 1988 | 7 | 7.3 |
| 1989 | 11 | 7.3 |
| 1990 | 6 | 7.9 |
| 1991 | 9 | 7.9 |
| 1992 | 10 | 7.9 |
| 1993 | 12 | 7.9 |
| 1994 | 4 | 7.9 |
| 1995 | 11 | 7.9 |
| 1996 | 14 | 7.9 |
| 1997 | 7 | 7.9 |
| 1998 | 1 | 7.9 |
| 1999 | 5 | 7.9 |
| 2000 | 6 | 6.8 |
| 2001 | 7 | 6.8 |
| 2002 | 6 | 6.8 |
| 2003 | 16 | 6.8 |
| 2004 | 11 | 6.8 |
| 2005 | 1 | 6.8 |
| 2006 | 3 | 6.8 |
| 2007 | 3 | 6.8 |
| 2008 | 8 | 6.8 |
| 2009 | 7 | 6.8 |
| 2010 | 8 | 6.2 |
| 2011 | 3 | 6.2 |
| 2012 | 3 | 6.2 |
| 2013 | 1 | 6.2 |
| 2014 | 6 | 6.2 |
| 2015 | 12 | 6.2 |
| 2016 | 5 | 6.2 |
| 2017 | 9 | 6.2 |
| 2019 | 9 | 6.2 |
| 2020 | 11 | 6.2 |
| 2022 | 6 | 6.2 |
| 2023 | 4 | 6.2 |
| 2024 | 8 | 6.2 |
| 2025 | 1 | 6.2 |
| 2026 | 7 | 6.2 |
| Year | First date | Last date |
|---|---|---|
| 1921 | 1921-04-27 | 1921-09-28 |
| 1922 | 1922-05-14 | 1922-09-08 |
| 1923 | 1923-09-05 | 1923-10-19 |
| 1924 | 1924-04-06 | 1924-09-11 |
| 1925 | 1925-06-23 | 1925-06-24 |
| 1926 | 1926-04-25 | 1926-09-24 |
| 1927 | 1927-05-13 | 1927-10-12 |
| 1928 | 1928-09-14 | 1928-10-08 |
| 1929 | 1929-06-20 | 1929-10-22 |
| 1930 | 1930-10-05 | 1930-10-06 |
| 1931 | 1931-05-08 | 1931-09-30 |
| 1932 | 1932-08-31 | 1932-09-09 |
| 1933 | 1933-10-04 | 1933-10-18 |
| 1934 | 1934-05-11 | 1934-10-09 |
| 1935 | 1935-06-02 | 1935-09-17 |
| 1936 | 1936-09-07 | 1936-10-08 |
| 1937 | 1937-06-26 | 1937-10-21 |
| 1938 | 1938-09-09 | 1938-09-09 |
| 1939 | 1939-09-16 | 1939-10-21 |
| 1941 | 1941-05-10 | 1941-10-03 |
| 1942 | 1942-05-20 | 1942-09-14 |
| 1943 | 1943-05-23 | 1943-09-22 |
| 1944 | 1944-09-08 | 1944-09-09 |
| 1945 | 1945-06-16 | 1945-06-17 |
| 1946 | 1946-09-18 | 1946-10-11 |
| 1947 | 1947-04-12 | 1947-09-21 |
| 1949 | 1949-06-04 | 1949-09-22 |
| 1950 | 1950-05-29 | 1950-09-03 |
| 1951 | 1951-05-25 | 1951-10-07 |
| 1952 | 1952-05-19 | 1952-10-01 |
| 1953 | 1953-06-24 | 1953-10-05 |
| 1954 | 1954-06-21 | 1954-10-14 |
| 1955 | 1955-09-01 | 1955-09-01 |
| 1956 | 1956-05-16 | 1956-09-22 |
| 1957 | 1957-06-17 | 1957-09-07 |
| 1958 | 1958-05-15 | 1958-10-09 |
| 1959 | 1959-07-10 | 1959-10-23 |
| 1960 | 1960-09-24 | 1960-10-16 |
| 1961 | 1961-09-03 | 1961-10-15 |
| 1962 | 1962-06-19 | 1962-08-27 |
| 1963 | 1963-07-26 | 1963-09-26 |
| 1964 | 1964-09-19 | 1964-10-19 |
| 1965 | 1965-10-01 | 1965-10-25 |
| 1966 | 1966-06-13 | 1966-11-01 |
| 1967 | 1967-09-12 | 1967-10-17 |
| 1968 | 1968-08-29 | 1968-09-24 |
| 1970 | 1970-05-15 | 1970-10-01 |
| 1971 | 1971-09-12 | 1971-10-12 |
| 1972 | 1972-07-13 | 1972-10-06 |
| 1973 | 1973-06-08 | 1973-09-28 |
| 1974 | 1974-09-11 | 1974-10-17 |
| 1975 | 1975-05-28 | 1975-09-24 |
| 1976 | 1976-06-14 | 1976-10-12 |
| 1978 | 1978-05-18 | 1978-10-13 |
| 1979 | 1979-06-08 | 1979-09-12 |
| 1980 | 1980-06-27 | 1980-10-03 |
| 1981 | 1981-04-29 | 1981-06-15 |
| 1982 | 1982-08-06 | 1982-08-06 |
| 1983 | 1983-05-19 | 1983-09-20 |
| 1984 | 1984-04-14 | 1984-09-28 |
| 1985 | 1985-04-02 | 1985-10-04 |
| 1986 | 1986-06-09 | 1986-10-04 |
| 1987 | 1987-04-21 | 1987-10-06 |
| 1988 | 1988-04-10 | 1988-10-17 |
| 1989 | 1989-04-05 | 1989-10-09 |
| 1990 | 1990-06-08 | 1990-10-09 |
| 1991 | 1991-07-01 | 1991-10-20 |
| 1992 | 1992-05-02 | 1992-10-10 |
| 1993 | 1993-05-09 | 1993-10-27 |
| 1994 | 1994-06-09 | 1994-10-08 |
| 1995 | 1995-06-24 | 1995-10-04 |
| 1996 | 1996-04-29 | 1996-10-08 |
| 1997 | 1997-09-20 | 1997-10-16 |
| 1998 | 1998-08-03 | 1998-08-03 |
| 1999 | 1999-09-26 | 1999-10-10 |
| 2000 | 2000-05-21 | 2000-09-19 |
| 2001 | 2001-05-07 | 2001-10-14 |
| 2002 | 2002-08-08 | 2002-10-07 |
| 2003 | 2003-05-28 | 2003-10-28 |
| 2004 | 2004-04-25 | 2004-10-13 |
| 2005 | 2005-03-11 | 2005-03-11 |
| 2006 | 2006-05-14 | 2006-09-25 |
| 2007 | 2007-05-06 | 2007-09-26 |
| 2008 | 2008-05-15 | 2008-09-05 |
| 2009 | 2009-04-20 | 2009-09-18 |
| 2010 | 2010-06-12 | 2010-10-13 |
| 2011 | 2011-06-20 | 2011-09-28 |
| 2012 | 2012-06-16 | 2012-10-02 |
| 2013 | 2013-05-02 | 2013-05-02 |
| 2014 | 2014-04-30 | 2014-10-04 |
| 2015 | 2015-07-19 | 2015-10-13 |
| 2016 | 2016-04-06 | 2016-10-08 |
| 2017 | 2017-06-18 | 2017-10-25 |
| 2019 | 2019-06-09 | 2019-10-25 |
| 2020 | 2020-08-15 | 2020-10-17 |
| 2022 | 2022-04-07 | 2022-10-19 |
| 2023 | 2023-08-23 | 2023-10-19 |
| 2024 | 2024-09-23 | 2024-10-07 |
| 2025 | 2025-09-23 | 2025-09-23 |
| 2026 | 2026-03-17 | 2026-10-04 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 100 | 16 | 2003 | 7 |
| 35 C (95 F): Days | 37 | 4 | 1939 | 3 |
| 40 C (104 F): Days | 1 | 1 | 2017 | 1 |
| 90 F (32.2 C): Days | 73 | 9 | 1984 | 3 |
| 100 F (37.8 C): Days | 7 | 2 | 1987 | 1 |
| 0 C (32 F): Frost days (min | 8 | 4 | 1937 | 4 |
| 20 C (68 F): Tropical nights (min | 21 | 3 | 1939 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 106 | 42 | 1983 | 11 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 105 | 12 | 1998 | 2 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 44 | 3 | 1982 | 1 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 3 | 1 | 1994 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1921.
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).