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

San Diego Threshold Days by Year (MXN00010122)

9 fixed thresholds counted per year at San Diego (MXN00010122): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for San Diego Thresholds

  • San Diego: days with 10 mm (0.39 in) or more of precipitation in 21 years, most in 1991 with 42.
  • San Diego: days with 25 mm (0.98 in) or more of precipitation in 21 years, most in 1980 with 15.
  • San Diego: days with a maximum temperature at or above 30 C (86 F) in 18 years, most in 2002 with 70.
  • San Diego: days with a maximum temperature at or above 90 F (32.2 C) in 14 years, most in 2002 with 38.
  • 9 fixed thresholds have at least one qualifying day at San Diego.
18 years with a qualifying day
Days at or above 30 C (86 F) per year at San Diego Days per year at San Diego with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 70 in 2002. 0204060801975: 651980: 661982: 611983: 691985: 621987: 541988: 531989: 651991: 371993: 171994: 41996: 11997: 282002: 702003: 372004: 132007: 62009: 12197519821985198819911994199720032007
Days per year at San Diego with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 70 in 2002.
Days at or above 30 C (86 F) per year at San Diego
YearDaysDecade average
19756565
19806661.4
19826161.4
19836961.4
19856261.4
19875461.4
19885361.4
19896561.4
19913717.4
19931717.4
1994417.4
1996117.4
19972817.4
20027027.6
20033727.6
20041327.6
2007627.6
20091227.6
First to last qualifying date each year at San Diego For each year, a bar from the first to the last day at San Diego meeting 30 C (86 F). 1975: 3 May 1975 to 31 October 19751980: 11 March 1980 to 7 October 19801982: 31 March 1982 to 22 October 19821983: 1 May 1983 to 10 October 19831985: 9 March 1985 to 25 October 19851987: 15 April 1987 to 30 October 19871988: 25 March 1988 to 7 October 19881989: 4 April 1989 to 23 October 19891991: 18 April 1991 to 22 September 19911993: 1 June 1993 to 21 June 19931994: 5 May 1994 to 30 May 19941996: 25 August 1996 to 25 August 19961997: 3 May 1997 to 2 November 19972002: 27 March 2002 to 8 November 20022003: 8 April 2003 to 19 June 20032004: 19 April 2004 to 2 June 20042007: 16 March 2007 to 4 June 20072009: 28 February 2009 to 29 September 2009197519831988199319972004JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at San Diego meeting 30 C (86 F).
First to last qualifying date each year at San Diego
YearFirst dateLast date
19751975-05-031975-10-31
19801980-03-111980-10-07
19821982-03-311982-10-22
19831983-05-011983-10-10
19851985-03-091985-10-25
19871987-04-151987-10-30
19881988-03-251988-10-07
19891989-04-041989-10-23
19911991-04-181991-09-22
19931993-06-011993-06-21
19941994-05-051994-05-30
19961996-08-251996-08-25
19971997-05-031997-11-02
20022002-03-272002-11-08
20032003-04-082003-06-19
20042004-04-192004-06-02
20072007-03-162007-06-04
20092009-02-282009-09-29

Every Fixed Threshold

Fixed thresholds at San Diego
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days1870200212
35 C (95 F): Days812200212
90 F (32.2 C): Days143820021
100 F (37.8 C): Days2119801
0 C (32 F): Frost days (min63620048
20 C (68 F): Tropical nights (min11819802
10 mm (0.39 in): Days with 10 mm or more rain2142199125
25 mm (0.98 in): Days with 25 mm or more rain211519806
50 mm (1.97 in): Days with 50 mm or more rain14219802

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1975.

Download the Data

  • Data for San Diego 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).