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

San Dimas Threshold Days by Year (MXN00010064)

12 fixed thresholds counted per year at San Dimas (MXN00010064): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for San Dimas Thresholds

  • San Dimas: days with 10 mm (0.39 in) or more of precipitation in 32 years, most in 1983 with 39.
  • San Dimas: days with 25 mm (0.98 in) or more of precipitation in 30 years, most in 1971 with 16.
  • San Dimas: nights with a minimum temperature at or above 20 C (68 F) in 25 years, most in 1966 with 140.
  • San Dimas: days with 50 mm (1.97 in) or more of precipitation in 25 years, most in 2008 with 6.
  • 12 fixed thresholds have at least one qualifying day at San Dimas.
24 years with a qualifying day
Days at or above 30 C (86 F) per year at San Dimas Days per year at San Dimas with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 329 in 2011. 01002003004001964: 2461965: 2971966: 3061967: 2361968: 2241974: 2901975: 2671978: 1771979: 1611980: 1301981: 1091982: 1891983: 932002: 2802003: 3222004: 2722005: 3022006: 3062007: 2962008: 2922009: 3162010: 2382011: 3292012: 30719641967197519801983200420072010
Days per year at San Dimas with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 329 in 2011.
Days at or above 30 C (86 F) per year at San Dimas
YearDaysDecade average
1964246261.8
1965297261.8
1966306261.8
1967236261.8
1968224261.8
1974290223.8
1975267223.8
1978177223.8
1979161223.8
1980130130.3
1981109130.3
1982189130.3
198393130.3
2002280298.3
2003322298.3
2004272298.3
2005302298.3
2006306298.3
2007296298.3
2008292298.3
2009316298.3
2010238291.3
2011329291.3
2012307291.3
First to last qualifying date each year at San Dimas For each year, a bar from the first to the last day at San Dimas meeting 30 C (86 F). 1964: 9 February 1964 to 31 December 19641965: 6 January 1965 to 31 December 19651966: 7 January 1966 to 29 December 19661967: 15 January 1967 to 7 December 19671968: 4 January 1968 to 26 November 19681974: 1 January 1974 to 20 December 19741975: 13 January 1975 to 21 December 19751978: 5 January 1978 to 22 December 19781979: 8 January 1979 to 13 December 19791980: 1 February 1980 to 29 December 19801981: 11 February 1981 to 22 December 19811982: 10 January 1982 to 27 December 19821983: 1 May 1983 to 25 December 19832002: 7 January 2002 to 31 December 20022003: 1 January 2003 to 31 December 20032004: 1 January 2004 to 31 December 20042005: 4 January 2005 to 31 December 20052006: 1 February 2006 to 31 December 20062007: 1 January 2007 to 31 December 20072008: 3 January 2008 to 30 December 20082009: 1 January 2009 to 18 December 20092010: 3 January 2010 to 31 December 20102011: 1 January 2011 to 31 December 20112012: 1 January 2012 to 31 December 201219641967197519801983200420072010JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at San Dimas meeting 30 C (86 F).
First to last qualifying date each year at San Dimas
YearFirst dateLast date
19641964-02-091964-12-31
19651965-01-061965-12-31
19661966-01-071966-12-29
19671967-01-151967-12-07
19681968-01-041968-11-26
19741974-01-011974-12-20
19751975-01-131975-12-21
19781978-01-051978-12-22
19791979-01-081979-12-13
19801980-02-011980-12-29
19811981-02-111981-12-22
19821982-01-101982-12-27
19831983-05-011983-12-25
20022002-01-072002-12-31
20032003-01-012003-12-31
20042004-01-012004-12-31
20052005-01-042005-12-31
20062006-02-012006-12-31
20072007-01-012007-12-31
20082008-01-032008-12-30
20092009-01-012009-12-18
20102010-01-032010-12-31
20112011-01-012011-12-31
20122012-01-012012-12-31

Every Fixed Threshold

Fixed thresholds at San Dimas
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days243292011307
35 C (95 F): Days24141201197
40 C (104 F): Days121019661
90 F (32.2 C): Days242542011186
100 F (37.8 C): Days2049196620
20 C (68 F): Tropical nights (min25140196670
25 C (77 F): Days with min2319651
10 mm (0.39 in): Days with 10 mm or more rain3239198326
25 mm (0.98 in): Days with 25 mm or more rain301619718
50 mm (1.97 in): Days with 50 mm or more rain25620081
100 mm (3.94 in): Days with 100 mm or more rain4119711
200 mm (7.87 in): Days with 200 mm or more rain1119791

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1964.

Download the Data

  • Data for San Dimas 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).