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Built 2026-10-19 (19 October 2026)

San Ramon Threshold Days by Year (MXN00003130)

14 fixed thresholds counted per year at San Ramon (MXN00003130): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for San Ramon Thresholds

  • San Ramon: days with 10 mm (0.39 in) or more of precipitation in 31 years, most in 1984 with 16.
  • San Ramon: days with a maximum temperature at or above 30 C (86 F) in 28 years, most in 1996 with 337.
  • San Ramon: days with a maximum temperature at or above 35 C (95 F) in 28 years, most in 1991 with 270.
  • San Ramon: days with a maximum temperature at or above 40 C (104 F) in 28 years, most in 1998 with 120.
  • 14 fixed thresholds have at least one qualifying day at San Ramon.
28 years with a qualifying day
Days at or above 30 C (86 F) per year at San Ramon Days per year at San Ramon with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 337 in 1996. 01002003004001983: 2171984: 2011985: 2661986: 2621987: 2321988: 2841989: 2781990: 2611991: 3331992: 2441993: 2431994: 3201996: 3371997: 2501998: 2401999: 2902000: 2062001: 2262002: 1952003: 2612004: 2392005: 2782006: 2472007: 2472008: 2782009: 2082010: 2842011: 2571983198619891992199619992002200520082011
Days per year at San Ramon with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 337 in 1996.
Days at or above 30 C (86 F) per year at San Ramon
YearDaysDecade average
1983217248.6
1984201248.6
1985266248.6
1986262248.6
1987232248.6
1988284248.6
1989278248.6
1990261279.8
1991333279.8
1992244279.8
1993243279.8
1994320279.8
1996337279.8
1997250279.8
1998240279.8
1999290279.8
2000206238.5
2001226238.5
2002195238.5
2003261238.5
2004239238.5
2005278238.5
2006247238.5
2007247238.5
2008278238.5
2009208238.5
2010284270.5
2011257270.5
First to last qualifying date each year at San Ramon For each year, a bar from the first to the last day at San Ramon meeting 30 C (86 F). 1983: 13 February 1983 to 27 November 19831984: 1 April 1984 to 23 December 19841985: 6 March 1985 to 31 December 19851986: 1 January 1986 to 31 December 19861987: 6 February 1987 to 31 December 19871988: 4 January 1988 to 31 December 19881989: 14 February 1989 to 13 December 19891990: 27 March 1990 to 31 December 19901991: 10 January 1991 to 15 December 19911992: 1 January 1992 to 30 December 19921993: 1 January 1993 to 27 December 19931994: 25 January 1994 to 31 December 19941996: 1 January 1996 to 31 December 19961997: 1 January 1997 to 5 December 19971998: 19 January 1998 to 31 December 19981999: 4 January 1999 to 29 December 19992000: 15 January 2000 to 25 December 20002001: 5 January 2001 to 21 December 20012002: 8 January 2002 to 30 November 20022003: 4 January 2003 to 24 December 20032004: 1 January 2004 to 23 December 20042005: 2 January 2005 to 30 December 20052006: 4 January 2006 to 7 December 20062007: 10 January 2007 to 20 November 20072008: 3 January 2008 to 29 December 20082009: 15 January 2009 to 19 December 20092010: 4 January 2010 to 26 December 20102011: 14 January 2011 to 30 December 20111983198719911996200020042008JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at San Ramon meeting 30 C (86 F).
First to last qualifying date each year at San Ramon
YearFirst dateLast date
19831983-02-131983-11-27
19841984-04-011984-12-23
19851985-03-061985-12-31
19861986-01-011986-12-31
19871987-02-061987-12-31
19881988-01-041988-12-31
19891989-02-141989-12-13
19901990-03-271990-12-31
19911991-01-101991-12-15
19921992-01-011992-12-30
19931993-01-011993-12-27
19941994-01-251994-12-31
19961996-01-011996-12-31
19971997-01-011997-12-05
19981998-01-191998-12-31
19991999-01-041999-12-29
20002000-01-152000-12-25
20012001-01-052001-12-21
20022002-01-082002-11-30
20032003-01-042003-12-24
20042004-01-012004-12-23
20052005-01-022005-12-30
20062006-01-042006-12-07
20072007-01-102007-11-20
20082008-01-032008-12-29
20092009-01-152009-12-19
20102010-01-042010-12-26
20112011-01-142011-12-30

Every Fixed Threshold

Fixed thresholds at San Ramon
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days283371996257
35 C (95 F): Days282701991176
40 C (104 F): Days28120199837
45 C (113 F): Days3319832
90 F (32.2 C): Days282971991211
100 F (37.8 C): Days281461986112
110 F (43.3 C): Days81219851
0 C (32 F): Frost days (min9420002
20 C (68 F): Tropical nights (min2310119841
25 C (77 F): Days with min527199727
10 mm (0.39 in): Days with 10 mm or more rain311619845
25 mm (0.98 in): Days with 25 mm or more rain27619831
50 mm (1.97 in): Days with 50 mm or more rain16419901
100 mm (3.94 in): Days with 100 mm or more rain1120061

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1983.

Download the Data

  • Data for San Ramon 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).