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Built 2026-10-19 (19 October 2026)

San Francisco (Smn) Threshold Days by Year (MXN00032049)

11 fixed thresholds counted per year at San Francisco (Smn) (MXN00032049): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for San Francisco (Smn) Thresholds

  • San Francisco (Smn): days with 10 mm (0.39 in) or more of precipitation in 55 years, most in 1958 with 21.
  • San Francisco (Smn): days with 25 mm (0.98 in) or more of precipitation in 45 years, most in 1968 with 6.
  • San Francisco (Smn): days with a maximum temperature at or above 30 C (86 F) in 16 years, most in 2011 with 223.
  • San Francisco (Smn): days with a maximum temperature at or above 35 C (95 F) in 16 years, most in 1998 with 71.
  • 11 fixed thresholds have at least one qualifying day at San Francisco (Smn).
16 years with a qualifying day
Days at or above 30 C (86 F) per year at San Francisco (Smn) Days per year at San Francisco (Smn) with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 223 in 2011. 01002003001990: 1541991: 1381992: 1401993: 1581994: 1641995: 1761996: 1741997: 1571998: 1931999: 1812000: 1722001: 1672009: 1802010: 1652011: 2232012: 18919901992199419961998200020092011
Days per year at San Francisco (Smn) with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 223 in 2011.
Days at or above 30 C (86 F) per year at San Francisco (Smn)
YearDaysDecade average
1990154163.5
1991138163.5
1992140163.5
1993158163.5
1994164163.5
1995176163.5
1996174163.5
1997157163.5
1998193163.5
1999181163.5
2000172173
2001167173
2009180173
2010165192.3
2011223192.3
2012189192.3
First to last qualifying date each year at San Francisco (Smn) For each year, a bar from the first to the last day at San Francisco (Smn) meeting 30 C (86 F). 1990: 5 March 1990 to 25 November 19901991: 5 March 1991 to 30 October 19911992: 7 March 1992 to 5 December 19921993: 13 February 1993 to 25 November 19931994: 5 February 1994 to 28 November 19941995: 1 March 1995 to 7 December 19951996: 31 January 1996 to 6 November 19961997: 24 February 1997 to 8 December 19971998: 24 February 1998 to 21 December 19981999: 7 February 1999 to 16 October 19992000: 26 January 2000 to 14 November 20002001: 13 February 2001 to 25 October 20012009: 26 January 2009 to 15 November 20092010: 26 March 2010 to 23 November 20102011: 15 February 2011 to 24 November 20112012: 27 February 2012 to 9 December 201219901992199419961998200020092011JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at San Francisco (Smn) meeting 30 C (86 F).
First to last qualifying date each year at San Francisco (Smn)
YearFirst dateLast date
19901990-03-051990-11-25
19911991-03-051991-10-30
19921992-03-071992-12-05
19931993-02-131993-11-25
19941994-02-051994-11-28
19951995-03-011995-12-07
19961996-01-311996-11-06
19971997-02-241997-12-08
19981998-02-241998-12-21
19991999-02-071999-10-16
20002000-01-262000-11-14
20012001-02-132001-10-25
20092009-01-262009-11-15
20102010-03-262010-11-23
20112011-02-152011-11-24
20122012-02-272012-12-09

Every Fixed Threshold

Fixed thresholds at San Francisco (Smn)
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days162232011189
35 C (95 F): Days1671199824
40 C (104 F): Days2119901
90 F (32.2 C): Days16148201192
100 F (37.8 C): Days10920111
0 C (32 F): Frost days (min1676199929
-10 C (14 F): Days with min4420114
20 C (68 F): Tropical nights (min8619983
10 mm (0.39 in): Days with 10 mm or more rain5521195810
25 mm (0.98 in): Days with 25 mm or more rain45619683
50 mm (1.97 in): Days with 50 mm or more rain8219731

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1990.

Download the Data

  • Data for San Francisco (Smn) 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).