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

San Marcos Threshold Days by Year (MXN00014183)

12 fixed thresholds counted per year at San Marcos (MXN00014183): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for San Marcos Thresholds

  • San Marcos: days with 10 mm (0.39 in) or more of precipitation in 21 years, most in 1963 with 57.
  • San Marcos: days with 25 mm (0.98 in) or more of precipitation in 21 years, most in 1948 with 20.
  • San Marcos: days with 50 mm (1.97 in) or more of precipitation in 14 years, most in 1948 with 4.
  • San Marcos: days with a maximum temperature at or above 30 C (86 F) in 3 years, most in 1988 with 146.
  • 12 fixed thresholds have at least one qualifying day at San Marcos.
3 years with a qualifying day
Days at or above 30 C (86 F) per year at San Marcos Days per year at San Marcos with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 146 in 1988. 0501001501986: 931987: 991988: 146198619871988
Days per year at San Marcos with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 146 in 1988.
Days at or above 30 C (86 F) per year at San Marcos
YearDaysDecade average
198693112.7
198799112.7
1988146112.7
First to last qualifying date each year at San Marcos For each year, a bar from the first to the last day at San Marcos meeting 30 C (86 F). 1986: 15 February 1986 to 18 November 19861987: 10 April 1987 to 26 October 19871988: 1 February 1988 to 25 December 1988198619871988JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at San Marcos meeting 30 C (86 F).
First to last qualifying date each year at San Marcos
YearFirst dateLast date
19861986-02-151986-11-18
19871987-04-101987-10-26
19881988-02-011988-12-25

Every Fixed Threshold

Fixed thresholds at San Marcos
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days31461988146
35 C (95 F): Days239198839
40 C (104 F): Days1219882
90 F (32.2 C): Days372198872
100 F (37.8 C): Days1219882
110 F (43.3 C): Days1219882
0 C (32 F): Frost days (min1519885
20 C (68 F): Tropical nights (min2819871
10 mm (0.39 in): Days with 10 mm or more rain2157196335
25 mm (0.98 in): Days with 25 mm or more rain2120194811
50 mm (1.97 in): Days with 50 mm or more rain14419483
100 mm (3.94 in): Days with 100 mm or more rain2119631

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1986.

Download the Data

  • Data for San Marcos 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).