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Data as of 2025-12-31
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Built 2026-10-19 (19 October 2026)

San Francisco Threshold Days by Year (MXN00028204)

17 fixed thresholds counted per year at San Francisco (MXN00028204): 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 26 years, most in 1992 with 27.
  • San Francisco: days with 25 mm (0.98 in) or more of precipitation in 26 years, most in 2007 with 12.
  • San Francisco: days with a maximum temperature at or above 30 C (86 F) in 24 years, most in 2008 with 339.
  • San Francisco: days with a maximum temperature at or above 35 C (95 F) in 24 years, most in 2008 with 304.
  • 17 fixed thresholds have at least one qualifying day at San Francisco.
24 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 339 in 2008. 01002003004001979: 2061980: 2281981: 2581982: 2631983: 2521984: 2551986: 1791990: 2311991: 1891992: 2321993: 2301994: 3071995: 3281996: 3161999: 2552000: 2482001: 2102002: 2392003: 1852004: 2062005: 2162006: 2522007: 3062008: 33919791982198619921995200020032006
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 339 in 2008.
Days at or above 30 C (86 F) per year at San Francisco
YearDaysDecade average
1979206206
1980228239.2
1981258239.2
1982263239.2
1983252239.2
1984255239.2
1986179239.2
1990231261
1991189261
1992232261
1993230261
1994307261
1995328261
1996316261
1999255261
2000248244.6
2001210244.6
2002239244.6
2003185244.6
2004206244.6
2005216244.6
2006252244.6
2007306244.6
2008339244.6
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). 1979: 14 February 1979 to 29 December 19791980: 11 January 1980 to 8 December 19801981: 29 January 1981 to 26 December 19811982: 2 January 1982 to 23 December 19821983: 10 January 1983 to 13 December 19831984: 28 January 1984 to 31 December 19841986: 15 January 1986 to 21 November 19861990: 21 January 1990 to 31 December 19901991: 26 January 1991 to 17 November 19911992: 19 February 1992 to 31 December 19921993: 3 January 1993 to 23 December 19931994: 8 February 1994 to 31 December 19941995: 1 January 1995 to 30 December 19951996: 11 January 1996 to 30 December 19961999: 17 January 1999 to 12 December 19992000: 1 January 2000 to 30 December 20002001: 17 January 2001 to 30 December 20012002: 18 January 2002 to 10 November 20022003: 3 February 2003 to 26 November 20032004: 4 January 2004 to 21 December 20042005: 5 January 2005 to 26 December 20052006: 1 January 2006 to 29 December 20062007: 6 February 2007 to 31 December 20072008: 4 January 2008 to 31 December 200819791982198619921995200020032006JanFebMarAprMayJunJulAugSepOctNovDec
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
19791979-02-141979-12-29
19801980-01-111980-12-08
19811981-01-291981-12-26
19821982-01-021982-12-23
19831983-01-101983-12-13
19841984-01-281984-12-31
19861986-01-151986-11-21
19901990-01-211990-12-31
19911991-01-261991-11-17
19921992-02-191992-12-31
19931993-01-031993-12-23
19941994-02-081994-12-31
19951995-01-011995-12-30
19961996-01-111996-12-30
19991999-01-171999-12-12
20002000-01-012000-12-30
20012001-01-172001-12-30
20022002-01-182002-11-10
20032003-02-032003-11-26
20042004-01-042004-12-21
20052005-01-052005-12-26
20062006-01-012006-12-29
20072007-02-062007-12-31
20082008-01-042008-12-31

Every Fixed Threshold

Fixed thresholds at San Francisco
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days243392008339
35 C (95 F): Days243042008304
40 C (104 F): Days231852008185
45 C (113 F): Days634200834
50 C (122 F): Days1220082
90 F (32.2 C): Days243232008323
100 F (37.8 C): Days242482008248
110 F (43.3 C): Days766200866
120 F (48.9 C): Days1320083
0 C (32 F): Frost days (min7619821
20 C (68 F): Tropical nights (min2326119941
25 C (77 F): Days with min1859200245
10 mm (0.39 in): Days with 10 mm or more rain2627199223
25 mm (0.98 in): Days with 25 mm or more rain261220079
50 mm (1.97 in): Days with 50 mm or more rain23619914
100 mm (3.94 in): Days with 100 mm or more rain3119901
200 mm (7.87 in): Days with 200 mm or more rain1119911

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1979.

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).