San Francisco Intl AP Weather Records (USW00023234)
Record envelope, standing records and threshold days for San Francisco Intl AP (USW00023234), California, United States, with 82 years of record.
Key Facts for San Francisco Intl AP
- San Francisco Intl AP (USW00023234) is a weather station in California, United States at 37.62 latitude and -122.37 longitude, 3 m (10 ft) above sea level.
- The station reports from 1945 to 2026, 82 years of record.
- 1,464 records set at San Francisco Intl AP still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- San Francisco Intl AP tied a daily record high minimum temperature of 17.8 C (64.0 F) on 4 October 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: California, United States, 37.62 latitude, -122.37 longitude.
- Elevation: 3 m (10 ft).
- Period of record: 1945 to 2026, 82 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
13 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 23.3 C (73.9 F) | -3.3 C (26.1 F) | 21.7 C (71.1 F) | 4.4 C (39.9 F) |
| Feb | 25.6 C (78.1 F) | -1.1 C (30.0 F) | 23.3 C (73.9 F) | 4.4 C (39.9 F) |
| Mar | 31.7 C (89.1 F) | -0.6 C (30.9 F) | 31.7 C (89.1 F) | 7.8 C (46.0 F) |
| Apr | 33.3 C (91.9 F) | 2.2 C (36.0 F) | 27.2 C (81.0 F) | 7.8 C (46.0 F) |
| May | 36.1 C (97.0 F) | 3.9 C (39.0 F) | 27.8 C (82.0 F) | 10.0 C (50.0 F) |
| Jun | 40.6 C (105.1 F) | 6.1 C (43.0 F) | 32.8 C (91.0 F) | 10.6 C (51.1 F) |
| Jul | 37.2 C (99.0 F) | 6.7 C (44.1 F) | 33.3 C (91.9 F) | 11.7 C (53.1 F) |
| Aug | 37.2 C (99.0 F) | 7.2 C (45.0 F) | 26.7 C (80.1 F) | 12.8 C (55.0 F) |
| Sep | 40.0 C (104.0 F) | 5.0 C (41.0 F) | 34.4 C (93.9 F) | 12.8 C (55.0 F) |
| Oct | 37.2 C (99.0 F) | 2.8 C (37.0 F) | 32.2 C (90.0 F) | 10.0 C (50.0 F) |
| Nov | 29.4 C (84.9 F) | -0.6 C (30.9 F) | n/a | n/a |
| Dec | 23.9 C (75.0 F) | -4.4 C (24.1 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1945 | 28 |
| 1946 | 49 |
| 1947 | 28 |
| 1948 | 28 |
| 1949 | 67 |
| 1950 | 51 |
| 1951 | 35 |
| 1952 | 27 |
| 1953 | 37 |
| 1954 | 36 |
| 1955 | 51 |
| 1956 | 19 |
| 1957 | 14 |
| 1958 | 32 |
| 1959 | 23 |
| 1960 | 8 |
| 1961 | 17 |
| 1962 | 23 |
| 1963 | 21 |
| 1964 | 19 |
| 1965 | 15 |
| 1966 | 14 |
| 1967 | 19 |
| 1968 | 19 |
| 1969 | 9 |
| 1970 | 18 |
| 1971 | 19 |
| 1972 | 26 |
| 1973 | 9 |
| 1974 | 16 |
| 1975 | 16 |
| 1976 | 13 |
| 1977 | 10 |
| 1978 | 14 |
| 1979 | 10 |
| 1980 | 8 |
| 1981 | 10 |
| 1982 | 13 |
| 1983 | 9 |
| 1984 | 14 |
| 1985 | 17 |
| 1986 | 9 |
| 1987 | 10 |
| 1988 | 8 |
| 1989 | 20 |
| 1990 | 15 |
| 1991 | 10 |
| 1992 | 13 |
| 1993 | 14 |
| 1994 | 4 |
| 1995 | 9 |
| 1996 | 21 |
| 1997 | 17 |
| 1998 | 9 |
| 1999 | 11 |
| 2000 | 13 |
| 2001 | 11 |
| 2002 | 10 |
| 2003 | 15 |
| 2004 | 16 |
| 2005 | 7 |
| 2006 | 6 |
| 2007 | 5 |
| 2008 | 10 |
| 2009 | 15 |
| 2010 | 15 |
| 2011 | 9 |
| 2012 | 10 |
| 2013 | 5 |
| 2014 | 44 |
| 2015 | 18 |
| 2016 | 15 |
| 2017 | 21 |
| 2018 | 11 |
| 2019 | 18 |
| 2020 | 23 |
| 2021 | 13 |
| 2022 | 18 |
| 2023 | 20 |
| 2024 | 10 |
| 2025 | 7 |
| 2026 | 18 |
All-Time Record Progression
3 new records| Date | Kind | Detail |
|---|---|---|
| 1982-01-04 | Record daily precipitation | Record daily precipitation 142.0 mm (5.6 in) |
| 2000-06-14 | Record high maximum temperature | Record high maximum temperature 40.6 C (105.1 F) |
| 2017-09-02 | Record high minimum temperature | Record high minimum temperature 22.2 C (72.0 F) |
Wettest Day of Each Month
Jan: 142.0 mm (5.6 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 142.0 mm (5.6 in) | 4 January 1982 |
| Feb | 74.2 mm (2.9 in) | 2 February 1998 |
| Mar | 50.5 mm (2.0 in) | 8 March 1978 |
| Apr | 58.4 mm (2.3 in) | 2 April 1958 |
| May | 38.9 mm (1.5 in) | 20 May 1957 |
| Jun | 20.6 mm (0.8 in) | 2 June 1967 |
| Jul | 8.9 mm (0.35 in) | 2 July 1977 |
| Aug | 14.2 mm (0.6 in) | 19 August 1997 |
| Sep | 58.2 mm (2.3 in) | 18 September 1959 |
| Oct | 102.1 mm (4.0 in) | 24 October 2021 |
| Nov | 64.8 mm (2.6 in) | 22 November 2024 |
| Dec | 93.2 mm (3.7 in) | 31 December 2022 |
Period of Record Coverage
1945 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1945 | 183 | 50% | No |
| 1946 | 350 | 96% | Yes |
| 1947 | 342 | 94% | Yes |
| 1948 | 366 | 100% | Yes |
| 1949 | 365 | 100% | Yes |
| 1950 | 365 | 100% | Yes |
| 1951 | 365 | 100% | Yes |
| 1952 | 366 | 100% | Yes |
| 1953 | 365 | 100% | Yes |
| 1954 | 365 | 100% | Yes |
| 1955 | 365 | 100% | Yes |
| 1956 | 366 | 100% | Yes |
| 1957 | 365 | 100% | Yes |
| 1958 | 365 | 100% | Yes |
| 1959 | 365 | 100% | Yes |
| 1960 | 365 | 100% | Yes |
| 1961 | 364 | 100% | Yes |
| 1962 | 365 | 100% | Yes |
| 1963 | 365 | 100% | Yes |
| 1964 | 366 | 100% | Yes |
| 1965 | 365 | 100% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 365 | 100% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 365 | 100% | Yes |
| 1970 | 365 | 100% | Yes |
| 1971 | 365 | 100% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 365 | 100% | Yes |
| 1975 | 365 | 100% | Yes |
| 1976 | 366 | 100% | Yes |
| 1977 | 365 | 100% | Yes |
| 1978 | 365 | 100% | Yes |
| 1979 | 365 | 100% | Yes |
| 1980 | 366 | 100% | Yes |
| 1981 | 365 | 100% | Yes |
| 1982 | 365 | 100% | Yes |
| 1983 | 365 | 100% | Yes |
| 1984 | 366 | 100% | Yes |
| 1985 | 365 | 100% | Yes |
| 1986 | 365 | 100% | Yes |
| 1987 | 365 | 100% | Yes |
| 1988 | 365 | 100% | Yes |
| 1989 | 365 | 100% | Yes |
| 1990 | 365 | 100% | Yes |
| 1991 | 365 | 100% | Yes |
| 1992 | 366 | 100% | Yes |
| 1993 | 364 | 100% | Yes |
| 1994 | 365 | 100% | Yes |
| 1995 | 365 | 100% | Yes |
| 1996 | 366 | 100% | Yes |
| 1997 | 365 | 100% | Yes |
| 1998 | 365 | 100% | Yes |
| 1999 | 365 | 100% | Yes |
| 2000 | 366 | 100% | Yes |
| 2001 | 365 | 100% | Yes |
| 2002 | 365 | 100% | Yes |
| 2003 | 365 | 100% | Yes |
| 2004 | 366 | 100% | Yes |
| 2005 | 365 | 100% | Yes |
| 2006 | 365 | 100% | Yes |
| 2007 | 365 | 100% | Yes |
| 2008 | 366 | 100% | Yes |
| 2009 | 365 | 100% | Yes |
| 2010 | 365 | 100% | Yes |
| 2011 | 365 | 100% | Yes |
| 2012 | 366 | 100% | Yes |
| 2013 | 365 | 100% | Yes |
| 2014 | 365 | 100% | Yes |
| 2015 | 365 | 100% | Yes |
| 2016 | 366 | 100% | Yes |
| 2017 | 365 | 100% | Yes |
| 2018 | 345 | 95% | Yes |
| 2019 | 365 | 100% | Yes |
| 2020 | 366 | 100% | Yes |
| 2021 | 365 | 100% | Yes |
| 2022 | 365 | 100% | Yes |
| 2023 | 365 | 100% | Yes |
| 2024 | 366 | 100% | Yes |
| 2025 | 365 | 100% | Yes |
| 2026 | 287 | 79% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 4 October 2026 | San Francisco Intl AP, US | daily high min (Tie, Provisional) | 17.8 C (64.0 F) | tie | 12 years | 2 of 100 (Routine) |
| 9 September 2026 | San Francisco Intl AP, US | daily high max (Provisional) | 34.4 C (93.9 F) | 1.1 C (2.0 F) | 75 years | 32 of 100 (Routine) |
| 9 September 2026 | San Francisco Intl AP, US | daily high min (Provisional) | 18.9 C (66.0 F) | 1.1 C (2.0 F) | 0 years | 13 of 100 (Routine) |
| 3 September 2026 | San Francisco Intl AP, US | daily rain (Provisional) | 0.3 mm (0.01 in) | 0.3 mm (0.01 in) | 80 years | 20 of 100 (Routine) |
| 21 July 2026 | San Francisco Intl AP, US | daily high max | 33.3 C (91.9 F) | 5.0 C (9.0 F) | 20 years | 29 of 100 (Routine) |
| 14 July 2026 | San Francisco Intl AP, US | daily high min (Tie) | 15.6 C (60.1 F) | tie | 53 years | 6 of 100 (Routine) |
| 19 June 2026 | San Francisco Intl AP, US | daily high min (Tie) | 16.1 C (61.0 F) | tie | 68 years | 7 of 100 (Routine) |
| 11 April 2026 | San Francisco Intl AP, US | daily rain | 26.4 mm (1.0 in) | 3.0 mm (0.12 in) | 16 years | 16 of 100 (Routine) |
| 10 April 2026 | San Francisco Intl AP, US | daily high min | 13.9 C (57.0 F) | 1.1 C (2.0 F) | 37 years | 24 of 100 (Routine) |
| 31 March 2026 | San Francisco Intl AP, US | daily high min | 15.0 C (59.0 F) | 0.6 C (1.1 F) | 25 years | 17 of 100 (Routine) |
| 30 March 2026 | San Francisco Intl AP, US | daily high min | 15.0 C (59.0 F) | 2.2 C (4.0 F) | 8 years | 19 of 100 (Routine) |
| 29 March 2026 | San Francisco Intl AP, US | daily high max | 28.9 C (84.0 F) | 1.7 C (3.1 F) | 8 years | 15 of 100 (Routine) |
| 27 March 2026 | San Francisco Intl AP, US | daily high max | 26.7 C (80.1 F) | 1.7 C (3.1 F) | 40 years | 25 of 100 (Routine) |
| 27 March 2026 | San Francisco Intl AP, US | daily high min (Tie) | 12.2 C (54.0 F) | tie | 40 years | 5 of 100 (Routine) |
| 24 March 2026 | San Francisco Intl AP, US | daily high max (Tie) | 25.6 C (78.1 F) | tie | 56 years | 6 of 100 (Routine) |
| 23 March 2026 | San Francisco Intl AP, US | daily high max | 24.4 C (75.9 F) | 1.6 C (2.9 F) | 56 years | 28 of 100 (Routine) |
| 21 March 2026 | San Francisco Intl AP, US | daily high max | 23.9 C (75.0 F) | 0.6 C (1.1 F) | 60 years | 27 of 100 (Routine) |
| 20 March 2026 | San Francisco Intl AP, US | monthly high max | 31.7 C (89.1 F) | 2.3 C (4.1 F) | 73 years | 47 of 100 (Notable) |
| 20 March 2026 | San Francisco Intl AP, US | daily high min | 14.4 C (57.9 F) | 1.6 C (2.9 F) | 33 years | 24 of 100 (Routine) |
| 19 March 2026 | San Francisco Intl AP, US | monthly high max (Tie) | 29.4 C (84.9 F) | tie | 73 years | 10 of 100 (Routine) |
Climate Trend
79 complete years, 1946 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1946 | 12.7 C | -1.57 C |
| 1948 | 12.6 C | -1.60 C |
| 1949 | 12.6 C | -1.61 C |
| 1950 | 13.6 C | -0.66 C |
| 1951 | 13.0 C | -1.26 C |
| 1952 | 13.0 C | -1.19 C |
| 1953 | 13.3 C | -0.89 C |
| 1954 | 13.1 C | -1.15 C |
| 1955 | 12.8 C | -1.44 C |
| 1956 | 13.4 C | -0.84 C |
| 1957 | 14.1 C | -0.10 C |
| 1958 | 15.6 C | +1.37 C |
| 1959 | 15.2 C | +0.94 C |
| 1960 | 13.9 C | -0.36 C |
| 1961 | 13.9 C | -0.31 C |
| 1962 | 13.2 C | -0.99 C |
| 1963 | 13.5 C | -0.68 C |
| 1964 | 13.5 C | -0.68 C |
| 1965 | 13.1 C | -1.15 C |
| 1966 | 13.5 C | -0.74 C |
| 1967 | 13.8 C | -0.40 C |
| 1968 | 13.7 C | -0.51 C |
| 1969 | 13.8 C | -0.39 C |
| 1970 | 14.2 C | -0.01 C |
| 1971 | 13.1 C | -1.08 C |
| 1972 | 13.5 C | -0.68 C |
| 1973 | 13.8 C | -0.44 C |
| 1974 | 13.5 C | -0.69 C |
| 1975 | 13.0 C | -1.22 C |
| 1976 | 13.8 C | -0.44 C |
| 1977 | 13.7 C | -0.49 C |
| 1978 | 14.1 C | -0.16 C |
| 1979 | 14.2 C | 0.00 C |
| 1980 | 13.9 C | -0.29 C |
| 1981 | 14.3 C | +0.07 C |
| 1982 | 13.3 C | -0.93 C |
| 1983 | 14.8 C | +0.53 C |
| 1984 | 14.7 C | +0.49 C |
| 1985 | 13.9 C | -0.35 C |
| 1986 | 14.6 C | +0.39 C |
| 1987 | 14.8 C | +0.59 C |
| 1988 | 14.8 C | +0.53 C |
| 1989 | 14.2 C | -0.04 C |
| 1990 | 14.4 C | +0.16 C |
| 1991 | 14.2 C | +0.01 C |
| 1992 | 15.4 C | +1.18 C |
| 1993 | 15.0 C | +0.82 C |
| 1994 | 13.9 C | -0.36 C |
| 1995 | 14.6 C | +0.33 C |
| 1996 | 14.8 C | +0.57 C |
| 1997 | 15.3 C | +1.10 C |
| 1998 | 14.1 C | -0.15 C |
| 1999 | 13.7 C | -0.52 C |
| 2000 | 14.5 C | +0.25 C |
| 2001 | 14.4 C | +0.14 C |
| 2002 | 14.5 C | +0.24 C |
| 2003 | 14.8 C | +0.54 C |
| 2004 | 15.1 C | +0.87 C |
| 2005 | 14.8 C | +0.57 C |
| 2006 | 14.3 C | +0.03 C |
| 2007 | 14.2 C | -0.04 C |
| 2008 | 14.2 C | +0.01 C |
| 2009 | 14.5 C | +0.28 C |
| 2010 | 14.8 C | +0.54 C |
| 2011 | 13.9 C | -0.36 C |
| 2012 | 14.2 C | -0.02 C |
| 2013 | 14.5 C | +0.24 C |
| 2014 | 16.7 C | +2.46 C |
| 2015 | 15.8 C | +1.56 C |
| 2016 | 15.4 C | +1.14 C |
| 2017 | 15.5 C | +1.27 C |
| 2018 | 14.9 C | +0.63 C |
| 2019 | 15.4 C | +1.21 C |
| 2020 | 15.7 C | +1.44 C |
| 2021 | 15.3 C | +1.03 C |
| 2022 | 15.0 C | +0.79 C |
| 2023 | 15.4 C | +1.13 C |
| 2024 | 15.0 C | +0.82 C |
| 2025 | 15.0 C | +0.74 C |
The annual mean temperature here has risen by 0.3 C (0.2 to 0.3) per decade over 1946 to 2025. In Fahrenheit: 0.5 F (0.4 to 0.6) per decade. The slope is a straight line fitted to 79 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.3 C (0.2 to 0.3) per decade | 0.5 F (0.4 to 0.6) per decade | 1946 to 2025 | 79 | Rise |
| Mean daily maximum | 0.2 C (0.1 to 0.3) per decade | 0.3 F (0.2 to 0.5) per decade | 1946 to 2025 | 79 | Rise |
| Mean daily minimum | 0.4 C (0.3 to 0.4) per decade | 0.6 F (0.5 to 0.7) per decade | 1946 to 2025 | 79 | Rise |
A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.
Extremes by Year
1945 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 40.6 C (105.1 F) | 2000 | 34.4 C (93.9 F) | 82 |
| Coldest night (TNn) | -4.4 C (24.1 F) | 1972 | 0.6 C (33.1 F) | 82 |
| Wettest day (Rx1day) | 142.0 mm (5.6 in) | 1982 | 46.1 mm (1.8 in) | 82 |
| Wettest five days (Rx5day) | 191.1 mm (7.5 in) | 1967 | 94.0 mm (3.7 in) | 82 |
| Longest dry spell (CDD) | 215 days | 2021 | 124 days | 82 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1945 | 31.1 C (88.0 F) |
| 1946 | 32.8 C (91.0 F) |
| 1947 | 34.4 C (93.9 F) |
| 1948 | 30.6 C (87.1 F) |
| 1949 | 33.3 C (91.9 F) |
| 1950 | 33.9 C (93.0 F) |
| 1951 | 33.9 C (93.0 F) |
| 1952 | 33.9 C (93.0 F) |
| 1953 | 34.4 C (93.9 F) |
| 1954 | 32.8 C (91.0 F) |
| 1955 | 34.4 C (93.9 F) |
| 1956 | 36.1 C (97.0 F) |
| 1957 | 34.4 C (93.9 F) |
| 1958 | 35.6 C (96.1 F) |
| 1959 | 36.1 C (97.0 F) |
| 1960 | 32.8 C (91.0 F) |
| 1961 | 35.0 C (95.0 F) |
| 1962 | 33.3 C (91.9 F) |
| 1963 | 34.4 C (93.9 F) |
| 1964 | 33.3 C (91.9 F) |
| 1965 | 31.1 C (88.0 F) |
| 1966 | 35.0 C (95.0 F) |
| 1967 | 33.3 C (91.9 F) |
| 1968 | 36.7 C (98.1 F) |
| 1969 | 30.0 C (86.0 F) |
| 1970 | 36.1 C (97.0 F) |
| 1971 | 39.4 C (102.9 F) |
| 1972 | 36.7 C (98.1 F) |
| 1973 | 36.7 C (98.1 F) |
| 1974 | 32.2 C (90.0 F) |
| 1975 | 34.4 C (93.9 F) |
| 1976 | 36.1 C (97.0 F) |
| 1977 | 36.1 C (97.0 F) |
| 1978 | 33.9 C (93.0 F) |
| 1979 | 37.8 C (100.0 F) |
| 1980 | 36.1 C (97.0 F) |
| 1981 | 33.3 C (91.9 F) |
| 1982 | 33.9 C (93.0 F) |
| 1983 | 37.2 C (99.0 F) |
| 1984 | 37.8 C (100.0 F) |
| 1985 | 37.2 C (99.0 F) |
| 1986 | 32.8 C (91.0 F) |
| 1987 | 37.2 C (99.0 F) |
| 1988 | 33.9 C (93.0 F) |
| 1989 | 36.7 C (98.1 F) |
| 1990 | 33.9 C (93.0 F) |
| 1991 | 32.8 C (91.0 F) |
| 1992 | 33.3 C (91.9 F) |
| 1993 | 36.1 C (97.0 F) |
| 1994 | 34.4 C (93.9 F) |
| 1995 | 35.0 C (95.0 F) |
| 1996 | 34.4 C (93.9 F) |
| 1997 | 33.9 C (93.0 F) |
| 1998 | 32.8 C (91.0 F) |
| 1999 | 32.2 C (90.0 F) |
| 2000 | 40.6 C (105.1 F) |
| 2001 | 35.0 C (95.0 F) |
| 2002 | 34.4 C (93.9 F) |
| 2003 | 36.1 C (97.0 F) |
| 2004 | 34.4 C (93.9 F) |
| 2005 | 31.7 C (89.1 F) |
| 2006 | 36.1 C (97.0 F) |
| 2007 | 31.7 C (89.1 F) |
| 2008 | 35.6 C (96.1 F) |
| 2009 | 35.0 C (95.0 F) |
| 2010 | 37.2 C (99.0 F) |
| 2011 | 32.2 C (90.0 F) |
| 2012 | 33.9 C (93.0 F) |
| 2013 | 31.7 C (89.1 F) |
| 2014 | 35.0 C (95.0 F) |
| 2015 | 33.9 C (93.0 F) |
| 2016 | 34.4 C (93.9 F) |
| 2017 | 40.0 C (104.0 F) |
| 2018 | 29.4 C (84.9 F) |
| 2019 | 37.8 C (100.0 F) |
| 2020 | 38.9 C (102.0 F) |
| 2021 | 32.2 C (90.0 F) |
| 2022 | 36.7 C (98.1 F) |
| 2023 | 33.3 C (91.9 F) |
| 2024 | 36.7 C (98.1 F) |
| 2025 | 32.8 C (91.0 F) |
| 2026 | 34.4 C (93.9 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1945 | -1.1 C (30.0 F) |
| 1946 | 0.0 C (32.0 F) |
| 1947 | -1.1 C (30.0 F) |
| 1948 | -1.1 C (30.0 F) |
| 1949 | -3.3 C (26.1 F) |
| 1950 | -2.2 C (28.0 F) |
| 1951 | 0.0 C (32.0 F) |
| 1952 | -1.1 C (30.0 F) |
| 1953 | 0.6 C (33.1 F) |
| 1954 | -0.6 C (30.9 F) |
| 1955 | -1.1 C (30.0 F) |
| 1956 | 0.0 C (32.0 F) |
| 1957 | 0.0 C (32.0 F) |
| 1958 | 2.2 C (36.0 F) |
| 1959 | 2.2 C (36.0 F) |
| 1960 | -1.7 C (28.9 F) |
| 1961 | 0.0 C (32.0 F) |
| 1962 | -1.1 C (30.0 F) |
| 1963 | -1.7 C (28.9 F) |
| 1964 | 0.6 C (33.1 F) |
| 1965 | -1.1 C (30.0 F) |
| 1966 | -1.1 C (30.0 F) |
| 1967 | -0.6 C (30.9 F) |
| 1968 | -1.7 C (28.9 F) |
| 1969 | 0.6 C (33.1 F) |
| 1970 | 0.6 C (33.1 F) |
| 1971 | -0.6 C (30.9 F) |
| 1972 | -4.4 C (24.1 F) |
| 1973 | -0.6 C (30.9 F) |
| 1974 | 0.0 C (32.0 F) |
| 1975 | -1.1 C (30.0 F) |
| 1976 | -0.6 C (30.9 F) |
| 1977 | 1.7 C (35.1 F) |
| 1978 | -1.7 C (28.9 F) |
| 1979 | -0.6 C (30.9 F) |
| 1980 | -0.6 C (30.9 F) |
| 1981 | 2.2 C (36.0 F) |
| 1982 | 0.6 C (33.1 F) |
| 1983 | 1.1 C (34.0 F) |
| 1984 | 1.1 C (34.0 F) |
| 1985 | 0.6 C (33.1 F) |
| 1986 | 3.9 C (39.0 F) |
| 1987 | 1.7 C (35.1 F) |
| 1988 | 0.6 C (33.1 F) |
| 1989 | -0.6 C (30.9 F) |
| 1990 | -2.8 C (27.0 F) |
| 1991 | 1.1 C (34.0 F) |
| 1992 | 1.7 C (35.1 F) |
| 1993 | 0.6 C (33.1 F) |
| 1994 | 1.7 C (35.1 F) |
| 1995 | 3.3 C (37.9 F) |
| 1996 | 2.2 C (36.0 F) |
| 1997 | 0.6 C (33.1 F) |
| 1998 | -0.6 C (30.9 F) |
| 1999 | 2.2 C (36.0 F) |
| 2000 | 3.3 C (37.9 F) |
| 2001 | 2.8 C (37.0 F) |
| 2002 | 1.7 C (35.1 F) |
| 2003 | 2.2 C (36.0 F) |
| 2004 | 1.7 C (35.1 F) |
| 2005 | 3.3 C (37.9 F) |
| 2006 | 1.7 C (35.1 F) |
| 2007 | 0.0 C (32.0 F) |
| 2008 | 1.1 C (34.0 F) |
| 2009 | 0.6 C (33.1 F) |
| 2010 | 2.8 C (37.0 F) |
| 2011 | 1.7 C (35.1 F) |
| 2012 | 1.1 C (34.0 F) |
| 2013 | 1.1 C (34.0 F) |
| 2014 | 5.0 C (41.0 F) |
| 2015 | 1.1 C (34.0 F) |
| 2016 | 2.2 C (36.0 F) |
| 2017 | 3.3 C (37.9 F) |
| 2018 | 2.2 C (36.0 F) |
| 2019 | 3.3 C (37.9 F) |
| 2020 | 3.3 C (37.9 F) |
| 2021 | 3.9 C (39.0 F) |
| 2022 | 1.7 C (35.1 F) |
| 2023 | 2.2 C (36.0 F) |
| 2024 | 3.9 C (39.0 F) |
| 2025 | 3.3 C (37.9 F) |
| 2026 | 4.4 C (39.9 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1945 | 43.9 mm (1.7 in) |
| 1946 | 28.4 mm (1.1 in) |
| 1947 | 23.9 mm (0.9 in) |
| 1948 | 37.1 mm (1.5 in) |
| 1949 | 32.8 mm (1.3 in) |
| 1950 | 35.8 mm (1.4 in) |
| 1951 | 42.7 mm (1.7 in) |
| 1952 | 46.0 mm (1.8 in) |
| 1953 | 29.0 mm (1.1 in) |
| 1954 | 31.0 mm (1.2 in) |
| 1955 | 75.9 mm (3.0 in) |
| 1956 | 47.2 mm (1.9 in) |
| 1957 | 38.9 mm (1.5 in) |
| 1958 | 58.4 mm (2.3 in) |
| 1959 | 58.2 mm (2.3 in) |
| 1960 | 35.1 mm (1.4 in) |
| 1961 | 34.5 mm (1.4 in) |
| 1962 | 66.5 mm (2.6 in) |
| 1963 | 50.5 mm (2.0 in) |
| 1964 | 63.2 mm (2.5 in) |
| 1965 | 50.5 mm (2.0 in) |
| 1966 | 33.8 mm (1.3 in) |
| 1967 | 103.4 mm (4.1 in) |
| 1968 | 39.9 mm (1.6 in) |
| 1969 | 46.2 mm (1.8 in) |
| 1970 | 53.1 mm (2.1 in) |
| 1971 | 37.1 mm (1.5 in) |
| 1972 | 53.3 mm (2.1 in) |
| 1973 | 60.7 mm (2.4 in) |
| 1974 | 33.8 mm (1.3 in) |
| 1975 | 47.2 mm (1.9 in) |
| 1976 | 55.6 mm (2.2 in) |
| 1977 | 46.0 mm (1.8 in) |
| 1978 | 50.5 mm (2.0 in) |
| 1979 | 56.1 mm (2.2 in) |
| 1980 | 34.8 mm (1.4 in) |
| 1981 | 53.8 mm (2.1 in) |
| 1982 | 142.0 mm (5.6 in) |
| 1983 | 50.8 mm (2.0 in) |
| 1984 | 44.7 mm (1.8 in) |
| 1985 | 38.6 mm (1.5 in) |
| 1986 | 46.5 mm (1.8 in) |
| 1987 | 41.9 mm (1.6 in) |
| 1988 | 31.8 mm (1.3 in) |
| 1989 | 32.3 mm (1.3 in) |
| 1990 | 33.8 mm (1.3 in) |
| 1991 | 37.1 mm (1.5 in) |
| 1992 | 35.3 mm (1.4 in) |
| 1993 | 59.4 mm (2.3 in) |
| 1994 | 54.4 mm (2.1 in) |
| 1995 | 80.3 mm (3.2 in) |
| 1996 | 41.7 mm (1.6 in) |
| 1997 | 47.2 mm (1.9 in) |
| 1998 | 74.2 mm (2.9 in) |
| 1999 | 22.9 mm (0.9 in) |
| 2000 | 43.7 mm (1.7 in) |
| 2001 | 47.0 mm (1.9 in) |
| 2002 | 62.7 mm (2.5 in) |
| 2003 | 66.0 mm (2.6 in) |
| 2004 | 56.9 mm (2.2 in) |
| 2005 | 48.5 mm (1.9 in) |
| 2006 | 29.7 mm (1.2 in) |
| 2007 | 35.6 mm (1.4 in) |
| 2008 | 64.5 mm (2.5 in) |
| 2009 | 67.1 mm (2.6 in) |
| 2010 | 38.6 mm (1.5 in) |
| 2011 | 37.6 mm (1.5 in) |
| 2012 | 49.8 mm (2.0 in) |
| 2013 | 16.0 mm (0.6 in) |
| 2014 | 87.1 mm (3.4 in) |
| 2015 | 30.7 mm (1.2 in) |
| 2016 | 37.8 mm (1.5 in) |
| 2017 | 54.9 mm (2.2 in) |
| 2018 | 79.2 mm (3.1 in) |
| 2019 | 41.7 mm (1.6 in) |
| 2020 | 18.3 mm (0.7 in) |
| 2021 | 102.1 mm (4.0 in) |
| 2022 | 93.2 mm (3.7 in) |
| 2023 | 41.9 mm (1.6 in) |
| 2024 | 64.8 mm (2.6 in) |
| 2025 | 48.3 mm (1.9 in) |
| 2026 | 33.5 mm (1.3 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1945 | 82.7 mm (3.3 in) |
| 1946 | 47.0 mm (1.9 in) |
| 1947 | 44.5 mm (1.8 in) |
| 1948 | 60.7 mm (2.4 in) |
| 1949 | 45.6 mm (1.8 in) |
| 1950 | 80.8 mm (3.2 in) |
| 1951 | 98.9 mm (3.9 in) |
| 1952 | 101.6 mm (4.0 in) |
| 1953 | 39.2 mm (1.5 in) |
| 1954 | 64.8 mm (2.6 in) |
| 1955 | 167.9 mm (6.6 in) |
| 1956 | 81.0 mm (3.2 in) |
| 1957 | 85.6 mm (3.4 in) |
| 1958 | 143.2 mm (5.6 in) |
| 1959 | 87.9 mm (3.5 in) |
| 1960 | 67.3 mm (2.6 in) |
| 1961 | 93.2 mm (3.7 in) |
| 1962 | 185.2 mm (7.3 in) |
| 1963 | 119.3 mm (4.7 in) |
| 1964 | 99.6 mm (3.9 in) |
| 1965 | 88.1 mm (3.5 in) |
| 1966 | 77.0 mm (3.0 in) |
| 1967 | 191.1 mm (7.5 in) |
| 1968 | 81.5 mm (3.2 in) |
| 1969 | 98.3 mm (3.9 in) |
| 1970 | 109.7 mm (4.3 in) |
| 1971 | 45.5 mm (1.8 in) |
| 1972 | 101.3 mm (4.0 in) |
| 1973 | 110.2 mm (4.3 in) |
| 1974 | 57.4 mm (2.3 in) |
| 1975 | 81.9 mm (3.2 in) |
| 1976 | 68.6 mm (2.7 in) |
| 1977 | 115.6 mm (4.6 in) |
| 1978 | 111.0 mm (4.4 in) |
| 1979 | 99.1 mm (3.9 in) |
| 1980 | 114.7 mm (4.5 in) |
| 1981 | 96.7 mm (3.8 in) |
| 1982 | 181.9 mm (7.2 in) |
| 1983 | 125.5 mm (4.9 in) |
| 1984 | 61.7 mm (2.4 in) |
| 1985 | 56.9 mm (2.2 in) |
| 1986 | 160.3 mm (6.3 in) |
| 1987 | 75.2 mm (3.0 in) |
| 1988 | 77.9 mm (3.1 in) |
| 1989 | 34.1 mm (1.3 in) |
| 1990 | 51.4 mm (2.0 in) |
| 1991 | 74.9 mm (2.9 in) |
| 1992 | 107.4 mm (4.2 in) |
| 1993 | 101.3 mm (4.0 in) |
| 1994 | 100.2 mm (3.9 in) |
| 1995 | 130.6 mm (5.1 in) |
| 1996 | 89.6 mm (3.5 in) |
| 1997 | 93.7 mm (3.7 in) |
| 1998 | 154.5 mm (6.1 in) |
| 1999 | 62.3 mm (2.5 in) |
| 2000 | 114.1 mm (4.5 in) |
| 2001 | 113.5 mm (4.5 in) |
| 2002 | 158.0 mm (6.2 in) |
| 2003 | 70.8 mm (2.8 in) |
| 2004 | 128.0 mm (5.0 in) |
| 2005 | 99.1 mm (3.9 in) |
| 2006 | 91.0 mm (3.6 in) |
| 2007 | 49.8 mm (2.0 in) |
| 2008 | 91.3 mm (3.6 in) |
| 2009 | 106.7 mm (4.2 in) |
| 2010 | 118.6 mm (4.7 in) |
| 2011 | 94.2 mm (3.7 in) |
| 2012 | 103.9 mm (4.1 in) |
| 2013 | 23.1 mm (0.9 in) |
| 2014 | 135.2 mm (5.3 in) |
| 2015 | 51.0 mm (2.0 in) |
| 2016 | 72.6 mm (2.9 in) |
| 2017 | 107.9 mm (4.2 in) |
| 2018 | 94.7 mm (3.7 in) |
| 2019 | 78.3 mm (3.1 in) |
| 2020 | 34.6 mm (1.4 in) |
| 2021 | 140.2 mm (5.5 in) |
| 2022 | 152.3 mm (6.0 in) |
| 2023 | 148.6 mm (5.9 in) |
| 2024 | 86.9 mm (3.4 in) |
| 2025 | 78.1 mm (3.1 in) |
| 2026 | 94.5 mm (3.7 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1945 | 96 days |
| 1946 | 59 days |
| 1947 | 53 days |
| 1948 | 110 days |
| 1949 | 100 days |
| 1950 | 97 days |
| 1951 | 118 days |
| 1952 | 109 days |
| 1953 | 133 days |
| 1954 | 148 days |
| 1955 | 189 days |
| 1956 | 130 days |
| 1957 | 129 days |
| 1958 | 105 days |
| 1959 | 126 days |
| 1960 | 133 days |
| 1961 | 78 days |
| 1962 | 153 days |
| 1963 | 124 days |
| 1964 | 141 days |
| 1965 | 112 days |
| 1966 | 84 days |
| 1967 | 121 days |
| 1968 | 99 days |
| 1969 | 121 days |
| 1970 | 131 days |
| 1971 | 124 days |
| 1972 | 108 days |
| 1973 | 155 days |
| 1974 | 84 days |
| 1975 | 59 days |
| 1976 | 124 days |
| 1977 | 78 days |
| 1978 | 135 days |
| 1979 | 88 days |
| 1980 | 100 days |
| 1981 | 129 days |
| 1982 | 79 days |
| 1983 | 147 days |
| 1984 | 132 days |
| 1985 | 97 days |
| 1986 | 135 days |
| 1987 | 174 days |
| 1988 | 128 days |
| 1989 | 115 days |
| 1990 | 114 days |
| 1991 | 45 days |
| 1992 | 76 days |
| 1993 | 132 days |
| 1994 | 128 days |
| 1995 | 170 days |
| 1996 | 153 days |
| 1997 | 49 days |
| 1998 | 120 days |
| 1999 | 68 days |
| 2000 | 85 days |
| 2001 | 90 days |
| 2002 | 169 days |
| 2003 | 182 days |
| 2004 | 113 days |
| 2005 | 93 days |
| 2006 | 135 days |
| 2007 | 142 days |
| 2008 | 201 days |
| 2009 | 130 days |
| 2010 | 142 days |
| 2011 | 96 days |
| 2012 | 139 days |
| 2013 | 169 days |
| 2014 | 152 days |
| 2015 | 144 days |
| 2016 | 169 days |
| 2017 | 94 days |
| 2018 | 168 days |
| 2019 | 117 days |
| 2020 | 92 days |
| 2021 | 215 days |
| 2022 | 149 days |
| 2023 | 185 days |
| 2024 | 111 days |
| 2025 | 142 days |
| 2026 | 139 days |
Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.
Rainfall Return Levels
80 years, 1946 to 2025A day with at least 45.2 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 121.2 mm (4.8 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 45.2 mm (1.8 in) | |
| 5 years | 62.2 mm (2.4 in) | |
| 10 years | 74.7 mm (2.9 in) | |
| 25 years | 92.0 mm (3.6 in) | |
| 50 years | 106.1 mm (4.2 in) | |
| 100 years | 121.2 mm (4.8 in) | Longer than the 80 years of record |
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 80 years of values from 1946 to 2025.
A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.
The largest wettest-day totals in the fit: 142.0 mm (5.6 in) in 1982; 103.4 mm (4.1 in) in 1967; 102.1 mm (4.0 in) in 2021.
Station Changes
1 suspectedOne change was suspected in the annual mean temperature of San Francisco Intl AP, at 1956. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1956 ran 0.4 C (0.7 F) higher than in the years before (likely change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1956 | +0.4 | +0.7 | likely | 5 |
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Climate Twins
2011 to 2025 against 1961 to 1990Over 2011 to 2025, San Francisco Intl AP had a mean temperature of 15.2 C (59.3 F) and 445.6 mm (17.5 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Twitchell Dam (United States, 345 km away), Santa Barbara Muni AP (United States, 422 km away) and Lompoc (United States, 372 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Twitchell Dam | United States | 345 km (214 mi) | 15.2 C (59.4 F) | 431.5 mm (17.0 in) | 0.47 |
| Santa Barbara Muni AP | United States | 422 km (262 mi) | 15.1 C (59.1 F) | 412.9 mm (16.3 in) | 0.51 |
| Lompoc | United States | 372 km (231 mi) | 14.6 C (58.3 F) | 354.5 mm (14.0 in) | 0.79 |
Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.
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). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-17).