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Built 2026-10-19 (19 October 2026)

San Francisco Threshold Days by Year (MXN00024066)

13 fixed thresholds counted per year at San Francisco (MXN00024066): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for San Francisco Thresholds

  • San Francisco: days with 10 mm (0.39 in) or more of precipitation in 42 years, most in 1991 with 20.
  • San Francisco: days with a maximum temperature at or above 30 C (86 F) in 41 years, most in 1995 with 251.
  • San Francisco: days with a maximum temperature at or above 35 C (95 F) in 41 years, most in 2009 with 134.
  • San Francisco: days with a maximum temperature at or above 90 F (32.2 C) in 41 years, most in 1964 with 178.
  • 13 fixed thresholds have at least one qualifying day at San Francisco.
41 years with a qualifying day
Days at or above 30 C (86 F) per year at San Francisco Days per year at San Francisco with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 251 in 1995. 01002003001961: 1981962: 2451963: 2071964: 2351966: 1971969: 1951970: 2161971: 2271972: 2471973: 2141974: 1951975: 2041976: 1651977: 1901978: 2031979: 2231980: 2001982: 2121983: 1901984: 1701987: 1981988: 2261989: 2151990: 2091991: 1811992: 1971994: 2461995: 2511996: 2281998: 2261999: 1852000: 2232001: 1892002: 2062003: 2192004: 2002005: 1922006: 2202007: 1922008: 1942009: 219196119691974197919871992199920042009
Days per year at San Francisco with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 251 in 1995.
Days at or above 30 C (86 F) per year at San Francisco
YearDaysDecade average
1961198212.8
1962245212.8
1963207212.8
1964235212.8
1966197212.8
1969195212.8
1970216208.4
1971227208.4
1972247208.4
1973214208.4
1974195208.4
1975204208.4
1976165208.4
1977190208.4
1978203208.4
1979223208.4
1980200201.6
1982212201.6
1983190201.6
1984170201.6
1987198201.6
1988226201.6
1989215201.6
1990209215.4
1991181215.4
1992197215.4
1994246215.4
1995251215.4
1996228215.4
1998226215.4
1999185215.4
2000223205.4
2001189205.4
2002206205.4
2003219205.4
2004200205.4
2005192205.4
2006220205.4
2007192205.4
2008194205.4
2009219205.4
First to last qualifying date each year at San Francisco For each year, a bar from the first to the last day at San Francisco meeting 30 C (86 F). 1961: 29 January 1961 to 31 December 19611962: 4 January 1962 to 21 December 19621963: 9 January 1963 to 13 December 19631964: 19 January 1964 to 11 December 19641966: 26 February 1966 to 28 December 19661969: 8 January 1969 to 29 December 19691970: 3 January 1970 to 30 December 19701971: 1 January 1971 to 20 December 19711972: 9 January 1972 to 30 December 19721973: 7 January 1973 to 31 December 19731974: 6 January 1974 to 24 December 19741975: 10 January 1975 to 30 November 19751976: 24 January 1976 to 30 December 19761977: 9 January 1977 to 31 December 19771978: 1 January 1978 to 20 December 19781979: 7 January 1979 to 24 November 19791980: 12 January 1980 to 6 December 19801982: 1 January 1982 to 3 December 19821983: 29 January 1983 to 28 December 19831984: 18 January 1984 to 30 November 19841987: 5 February 1987 to 26 December 19871988: 7 January 1988 to 28 December 19881989: 2 January 1989 to 29 December 19891990: 5 January 1990 to 29 December 19901991: 21 January 1991 to 3 December 19911992: 1 January 1992 to 21 December 19921994: 26 January 1994 to 9 December 19941995: 7 January 1995 to 18 December 19951996: 5 January 1996 to 13 December 19961998: 5 January 1998 to 19 December 19981999: 21 January 1999 to 12 December 19992000: 1 January 2000 to 18 November 20002001: 17 January 2001 to 28 November 20012002: 19 January 2002 to 19 December 20022003: 6 February 2003 to 30 October 20032004: 4 February 2004 to 29 December 20042005: 7 January 2005 to 27 December 20052006: 16 January 2006 to 19 November 20062007: 6 January 2007 to 31 December 20072008: 8 January 2008 to 28 September 20082009: 9 February 2009 to 9 December 20091961197019761983199119992005JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at San Francisco meeting 30 C (86 F).
First to last qualifying date each year at San Francisco
YearFirst dateLast date
19611961-01-291961-12-31
19621962-01-041962-12-21
19631963-01-091963-12-13
19641964-01-191964-12-11
19661966-02-261966-12-28
19691969-01-081969-12-29
19701970-01-031970-12-30
19711971-01-011971-12-20
19721972-01-091972-12-30
19731973-01-071973-12-31
19741974-01-061974-12-24
19751975-01-101975-11-30
19761976-01-241976-12-30
19771977-01-091977-12-31
19781978-01-011978-12-20
19791979-01-071979-11-24
19801980-01-121980-12-06
19821982-01-011982-12-03
19831983-01-291983-12-28
19841984-01-181984-11-30
19871987-02-051987-12-26
19881988-01-071988-12-28
19891989-01-021989-12-29
19901990-01-051990-12-29
19911991-01-211991-12-03
19921992-01-011992-12-21
19941994-01-261994-12-09
19951995-01-071995-12-18
19961996-01-051996-12-13
19981998-01-051998-12-19
19991999-01-211999-12-12
20002000-01-012000-11-18
20012001-01-172001-11-28
20022002-01-192002-12-19
20032003-02-062003-10-30
20042004-02-042004-12-29
20052005-01-072005-12-27
20062006-01-162006-11-19
20072007-01-062007-12-31
20082008-01-082008-09-28
20092009-02-092009-12-09

Every Fixed Threshold

Fixed thresholds at San Francisco
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days412511995219
35 C (95 F): Days411342009134
40 C (104 F): Days3267200967
45 C (113 F): Days4219712
90 F (32.2 C): Days411781964167
100 F (37.8 C): Days401022009102
110 F (43.3 C): Days6820098
0 C (32 F): Frost days (min381319731
20 C (68 F): Tropical nights (min332019957
10 mm (0.39 in): Days with 10 mm or more rain4220199121
25 mm (0.98 in): Days with 25 mm or more rain351019906
50 mm (1.97 in): Days with 50 mm or more rain11619901
100 mm (3.94 in): Days with 100 mm or more rain1219902

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1961.

Download the Data

  • Data for San Francisco threshold days by year: CSV or JSON. Field meanings are on the data page.

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 (2025-12-31).