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Built 2026-10-19 (19 October 2026)

San Francisco II Threshold Days by Year (MXN00024154)

8 fixed thresholds counted per year at San Francisco II (MXN00024154): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for San Francisco II Thresholds

  • San Francisco II: days with a maximum temperature at or above 30 C (86 F) in 18 years, most in 2009 with 52.
  • San Francisco II: days with 10 mm (0.39 in) or more of precipitation in 18 years, most in 1992 with 23.
  • San Francisco II: nights with a minimum temperature at or below 0 C (32 F) in 14 years, most in 2007 with 48.
  • San Francisco II: days with 25 mm (0.98 in) or more of precipitation in 10 years, most in 1995 with 5.
  • 8 fixed thresholds have at least one qualifying day at San Francisco II.
18 years with a qualifying day
Days at or above 30 C (86 F) per year at San Francisco II Days per year at San Francisco II with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 52 in 2009. 02040601977: 41983: 151991: 341992: 91994: 381995: 331996: 261997: 101998: 461999: 182000: 62001: 242002: 102006: 342007: 72008: 332009: 522010: 48197719911994199619982000200220072009
Days per year at San Francisco II with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 52 in 2009.
Days at or above 30 C (86 F) per year at San Francisco II
YearDaysDecade average
197744
19831515
19913426.8
1992926.8
19943826.8
19953326.8
19962626.8
19971026.8
19984626.8
19991826.8
2000623.7
20012423.7
20021023.7
20063423.7
2007723.7
20083323.7
20095223.7
20104848
First to last qualifying date each year at San Francisco II For each year, a bar from the first to the last day at San Francisco II meeting 30 C (86 F). 1977: 28 April 1977 to 22 June 19771983: 31 March 1983 to 15 June 19831991: 5 January 1991 to 18 June 19911992: 20 June 1992 to 1 October 19921994: 19 March 1994 to 12 July 19941995: 21 March 1995 to 7 June 19951996: 18 April 1996 to 7 August 19961997: 3 June 1997 to 19 August 19971998: 3 April 1998 to 13 July 19981999: 11 April 1999 to 1 July 19992000: 25 April 2000 to 25 May 20002001: 2 April 2001 to 14 June 20012002: 8 April 2002 to 26 May 20022006: 9 April 2006 to 12 October 20062007: 2 May 2007 to 17 June 20072008: 24 January 2008 to 7 November 20082009: 18 January 2009 to 21 November 20092010: 1 January 2010 to 27 December 2010197719921996199920022008JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at San Francisco II meeting 30 C (86 F).
First to last qualifying date each year at San Francisco II
YearFirst dateLast date
19771977-04-281977-06-22
19831983-03-311983-06-15
19911991-01-051991-06-18
19921992-06-201992-10-01
19941994-03-191994-07-12
19951995-03-211995-06-07
19961996-04-181996-08-07
19971997-06-031997-08-19
19981998-04-031998-07-13
19991999-04-111999-07-01
20002000-04-252000-05-25
20012001-04-022001-06-14
20022002-04-082002-05-26
20062006-04-092006-10-12
20072007-05-022007-06-17
20082008-01-242008-11-07
20092009-01-182009-11-21
20102010-01-012010-12-27

Every Fixed Threshold

Fixed thresholds at San Francisco II
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days1852200948
35 C (95 F): Days3519911
90 F (32.2 C): Days82519912
100 F (37.8 C): Days2119831
0 C (32 F): Frost days (min144820076
20 C (68 F): Tropical nights (min1120031
10 mm (0.39 in): Days with 10 mm or more rain182319924
25 mm (0.98 in): Days with 25 mm or more rain10519952

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1977.

Download the Data

  • Data for San Francisco II 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).