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

San Bruno Threshold Days by Year (MXN00003093)

14 fixed thresholds counted per year at San Bruno (MXN00003093): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for San Bruno Thresholds

  • San Bruno: days with 10 mm (0.39 in) or more of precipitation in 28 years, most in 1983 with 8.
  • San Bruno: days with a maximum temperature at or above 30 C (86 F) in 27 years, most in 1988 with 231.
  • San Bruno: days with a maximum temperature at or above 35 C (95 F) in 27 years, most in 1988 with 165.
  • San Bruno: days with a maximum temperature at or above 90 F (32.2 C) in 27 years, most in 1988 with 198.
  • 14 fixed thresholds have at least one qualifying day at San Bruno.
27 years with a qualifying day
Days at or above 30 C (86 F) per year at San Bruno Days per year at San Bruno with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 231 in 1988. 01002003001974: 1671975: 1471976: 1611977: 1461978: 1721979: 1771980: 1811981: 1801982: 1681983: 1451984: 1721985: 1831987: 1811988: 2311989: 2101992: 1862000: 1402001: 1602002: 1572003: 1642004: 1772005: 1262006: 1312007: 1402008: 1672009: 1682012: 161197419771980198319871992200220052008
Days per year at San Bruno with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 231 in 1988.
Days at or above 30 C (86 F) per year at San Bruno
YearDaysDecade average
1974167161.7
1975147161.7
1976161161.7
1977146161.7
1978172161.7
1979177161.7
1980181183.4
1981180183.4
1982168183.4
1983145183.4
1984172183.4
1985183183.4
1987181183.4
1988231183.4
1989210183.4
1992186186
2000140153
2001160153
2002157153
2003164153
2004177153
2005126153
2006131153
2007140153
2008167153
2009168153
2012161161
First to last qualifying date each year at San Bruno For each year, a bar from the first to the last day at San Bruno meeting 30 C (86 F). 1974: 6 April 1974 to 27 October 19741975: 3 March 1975 to 1 November 19751976: 21 April 1976 to 20 October 19761977: 9 March 1977 to 1 December 19771978: 28 March 1978 to 14 November 19781979: 15 April 1979 to 9 December 19791980: 18 February 1980 to 11 November 19801981: 28 March 1981 to 2 November 19811982: 11 April 1982 to 4 November 19821983: 24 April 1983 to 22 October 19831984: 18 April 1984 to 13 October 19841985: 9 April 1985 to 8 November 19851987: 30 April 1987 to 5 December 19871988: 26 March 1988 to 23 November 19881989: 27 February 1989 to 17 November 19891992: 30 March 1992 to 9 November 19922000: 23 January 2000 to 20 November 20002001: 18 April 2001 to 1 November 20012002: 23 April 2002 to 18 October 20022003: 18 February 2003 to 31 October 20032004: 11 March 2004 to 24 October 20042005: 9 June 2005 to 15 November 20052006: 23 February 2006 to 30 September 20062007: 11 March 2007 to 4 November 20072008: 4 April 2008 to 4 November 20082009: 5 March 2009 to 7 November 20092012: 19 April 2012 to 7 November 20121974197819821987200020042008JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at San Bruno meeting 30 C (86 F).
First to last qualifying date each year at San Bruno
YearFirst dateLast date
19741974-04-061974-10-27
19751975-03-031975-11-01
19761976-04-211976-10-20
19771977-03-091977-12-01
19781978-03-281978-11-14
19791979-04-151979-12-09
19801980-02-181980-11-11
19811981-03-281981-11-02
19821982-04-111982-11-04
19831983-04-241983-10-22
19841984-04-181984-10-13
19851985-04-091985-11-08
19871987-04-301987-12-05
19881988-03-261988-11-23
19891989-02-271989-11-17
19921992-03-301992-11-09
20002000-01-232000-11-20
20012001-04-182001-11-01
20022002-04-232002-10-18
20032003-02-182003-10-31
20042004-03-112004-10-24
20052005-06-092005-11-15
20062006-02-232006-09-30
20072007-03-112007-11-04
20082008-04-042008-11-04
20092009-03-052009-11-07
20122012-04-192012-11-07

Every Fixed Threshold

Fixed thresholds at San Bruno
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days272311988161
35 C (95 F): Days27165198870
40 C (104 F): Days91920031
45 C (113 F): Days2120031
90 F (32.2 C): Days271981988118
100 F (37.8 C): Days2751200311
110 F (43.3 C): Days2220032
0 C (32 F): Frost days (min1220002
20 C (68 F): Tropical nights (min271311981105
25 C (77 F): Days with min2460198144
10 mm (0.39 in): Days with 10 mm or more rain28819835
25 mm (0.98 in): Days with 25 mm or more rain25519751
50 mm (1.97 in): Days with 50 mm or more rain12319791
100 mm (3.94 in): Days with 100 mm or more rain5219811

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1974.

Download the Data

  • Data for San Bruno 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).