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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 (MXN00019101)

15 fixed thresholds counted per year at San Diego (MXN00019101): 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 11 years, most in 2005 with 30.
  • San Diego: days with a maximum temperature at or above 30 C (86 F) in 10 years, most in 1999 with 281.
  • San Diego: days with a maximum temperature at or above 35 C (95 F) in 10 years, most in 2011 with 198.
  • San Diego: days with a maximum temperature at or above 40 C (104 F) in 10 years, most in 2000 with 85.
  • 15 fixed thresholds have at least one qualifying day at San Diego.
10 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 281 in 1999. 01002003001999: 2812000: 2672001: 2362002: 2382004: 2602005: 2392008: 2542009: 2272010: 2042011: 2721999200020012002200420052008200920102011
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 281 in 1999.
Days at or above 30 C (86 F) per year at San Diego
YearDaysDecade average
1999281281
2000267245.9
2001236245.9
2002238245.9
2004260245.9
2005239245.9
2008254245.9
2009227245.9
2010204238
2011272238
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). 1999: 2 January 1999 to 31 December 19992000: 2 January 2000 to 12 December 20002001: 14 January 2001 to 23 December 20012002: 9 January 2002 to 29 December 20022004: 4 January 2004 to 30 December 20042005: 1 January 2005 to 31 December 20052008: 5 January 2008 to 27 December 20082009: 2 January 2009 to 14 November 20092010: 19 January 2010 to 31 December 20102011: 6 January 2011 to 31 December 201119992001200420082010JanFebMarAprMayJunJulAugSepOctNovDec
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
19991999-01-021999-12-31
20002000-01-022000-12-12
20012001-01-142001-12-23
20022002-01-092002-12-29
20042004-01-042004-12-30
20052005-01-012005-12-31
20082008-01-052008-12-27
20092009-01-022009-11-14
20102010-01-192010-12-31
20112011-01-062011-12-31

Every Fixed Threshold

Fixed thresholds at San Diego
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days102811999272
35 C (95 F): Days101982011198
40 C (104 F): Days1085200069
45 C (113 F): Days4320021
90 F (32.2 C): Days102252000225
100 F (37.8 C): Days101362000124
110 F (43.3 C): Days5420021
0 C (32 F): Frost days (min5720117
20 C (68 F): Tropical nights (min71702005161
25 C (77 F): Days with min722201122
10 mm (0.39 in): Days with 10 mm or more rain113020057
25 mm (0.98 in): Days with 25 mm or more rain81420022
50 mm (1.97 in): Days with 50 mm or more rain7620084
100 mm (3.94 in): Days with 100 mm or more rain5220021
200 mm (7.87 in): Days with 200 mm or more rain1120101

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1999.

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).