San Marcos Threshold Days by Year (MXN00014129)

11 fixed thresholds counted per year at San Marcos (MXN00014129): 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 33 years, most in 1967 with 47.
San Marcos: days with 25 mm (0.98 in) or more of precipitation in 33 years, most in 1980 with 21.
San Marcos: days with 50 mm (1.97 in) or more of precipitation in 28 years, most in 1992 with 10.
San Marcos: days with a maximum temperature at or above 30 C (86 F) in 26 years, most in 1987 with 353.
11 fixed thresholds have at least one qualifying day at San Marcos.

Days at or above 30 C (86 F)

26 years with a qualifying day

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 353 in 1987.

Days at or above 30 C (86 F) per year at San Marcos
Year	Days	Decade average
1967	54	60
1969	66	60
1972	338	311.8
1973	317	311.8
1974	320	311.8
1975	314	311.8
1976	291	311.8
1977	293	311.8
1978	285	311.8
1979	336	311.8
1980	338	344.2
1981	339	344.2
1982	344	344.2
1983	330	344.2
1984	339	344.2
1985	347	344.2
1986	351	344.2
1987	353	344.2
1988	351	344.2
1989	350	344.2
1990	328	332.2
1991	319	332.2
1992	311	332.2
1993	343	332.2
1994	353	332.2
1995	339	332.2

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
Year	First date	Last date
1967	1967-04-05	1967-11-30
1969	1969-04-10	1969-11-18
1972	1972-01-01	1972-12-31
1973	1973-01-03	1973-12-31
1974	1974-01-01	1974-12-31
1975	1975-01-01	1975-12-24
1976	1976-01-01	1976-12-31
1977	1977-01-01	1977-12-31
1978	1978-01-01	1978-12-31
1979	1979-01-01	1979-12-31
1980	1980-01-01	1980-12-31
1981	1981-01-01	1981-12-31
1982	1982-01-01	1982-12-31
1983	1983-01-01	1983-12-31
1984	1984-01-01	1984-12-31
1985	1985-01-01	1985-12-31
1986	1986-01-01	1986-12-31
1987	1987-01-01	1987-12-30
1988	1988-01-01	1988-12-31
1989	1989-01-01	1989-12-31
1990	1990-01-02	1990-12-31
1991	1991-01-01	1991-11-30
1992	1992-01-01	1992-12-31
1993	1993-01-01	1993-12-31
1994	1994-01-01	1994-12-31
1995	1995-01-01	1995-12-31

Every Fixed Threshold

Fixed thresholds at San Marcos
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	26	353	1987	339
35 C (95 F): Days	25	221	1994	167
40 C (104 F): Days	17	36	1994	19
90 F (32.2 C): Days	26	313	1994	262
100 F (37.8 C): Days	20	83	1991	55
0 C (32 F): Frost days (min	1	6	1969	6
20 C (68 F): Tropical nights (min	4	6	1969	6
10 mm (0.39 in): Days with 10 mm or more rain	33	47	1967	26
25 mm (0.98 in): Days with 25 mm or more rain	33	21	1980	10
50 mm (1.97 in): Days with 50 mm or more rain	28	10	1992	1
100 mm (3.94 in): Days with 100 mm or more rain	6	3	1992	3

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1967.

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 2025-12-31. Last revised 31 December 2025 (2025-12-31).

San Marcos Threshold Days by Year (MXN00014129)

Key Facts for San Marcos Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

Related