San Marcos Weather Records (MXN00010070)

Record envelope, standing records and threshold days for San Marcos (MXN00010070), Mexico, with 65 years of record.

Key Facts for San Marcos

San Marcos (MXN00010070) is a weather station in Mexico at 24.28 latitude and -103.53 longitude, 2,000 m (6,561 ft) above sea level.
The station reports from 1942 to 2006, 65 years of record.
1,464 records set at San Marcos still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
San Marcos set a daily record precipitation of 18.8 mm (0.7 in) on 17 May 2006.

About the Station

Location: Mexico, 24.28 latitude, -103.53 longitude.
Elevation: 2,000 m (6,561 ft).
Period of record: 1942 to 2006, 65 years.
Eligible elements: prcp.

Daily Record Envelope and 2026

0 days at or beyond a record

The band shows the record high and record low for each calendar day at San Marcos. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at San Marcos, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	30.6 C (87.1 F)	-8.3 C (17.1 F)	n/a	n/a
Feb	31.7 C (89.1 F)	-4.4 C (24.1 F)	n/a	n/a
Mar	36.7 C (98.1 F)	-1.1 C (30.0 F)	n/a	n/a
Apr	40.0 C (104.0 F)	-2.2 C (28.0 F)	n/a	n/a
May	40.6 C (105.1 F)	2.8 C (37.0 F)	n/a	n/a
Jun	40.0 C (104.0 F)	8.9 C (48.0 F)	n/a	n/a
Jul	36.7 C (98.1 F)	10.0 C (50.0 F)	n/a	n/a
Aug	35.0 C (95.0 F)	10.0 C (50.0 F)	n/a	n/a
Sep	35.0 C (95.0 F)	5.0 C (41.0 F)	n/a	n/a
Oct	35.0 C (95.0 F)	0.0 C (32.0 F)	n/a	n/a
Nov	30.6 C (87.1 F)	-3.3 C (26.1 F)	n/a	n/a
Dec	27.8 C (82.0 F)	-6.1 C (21.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at San Marcos still stand. 2002 holds the most, with 312.

Wettest Day of Each Month

Jun: 177.5 mm (7.0 in)

The wettest day on record for each calendar month at San Marcos. The most was 177.5 mm (7.0 in) on 30 June 1943.

Record daily precipitation for each month at San Marcos
Month	Record daily precipitation (mm)	Date
Jan	37.8 mm (1.5 in)	12 January 1987
Feb	49.8 mm (2.0 in)	25 February 1987
Mar	30.5 mm (1.2 in)	3 March 1968
Apr	27.4 mm (1.1 in)	30 April 1965
May	55.4 mm (2.2 in)	15 May 1956
Jun	177.5 mm (7.0 in)	30 June 1943
Jul	96.8 mm (3.8 in)	30 July 1964
Aug	79.5 mm (3.1 in)	31 August 1954
Sep	63.5 mm (2.5 in)	11 September 1978
Oct	50.8 mm (2.0 in)	25 October 1983
Nov	45.0 mm (1.8 in)	25 November 1982
Dec	26.4 mm (1.0 in)	18 December 1975

Period of Record Coverage

2000 to 2006

7 years of record at San Marcos, 2000 to 2006. 4 years have data for under 90 percent of days and are left out of rankings: 2000, 2001, 2004, 2006.

Latest Records

Latest records at San Marcos
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 May 2006	San Marcos, MX	daily rain	18.8 mm (0.7 in)	3.8 mm (0.15 in)	19 years	15 of 100 (Routine)
16 May 2006	San Marcos, MX	daily rain	19.3 mm (0.8 in)	11.9 mm (0.5 in)	49 years	20 of 100 (Routine)
25 January 2006	San Marcos, MX	daily rain	23.9 mm (0.9 in)	23.9 mm (0.9 in)	63 years	20 of 100 (Routine)
14 October 2005	San Marcos, MX	daily rain	15.5 mm (0.6 in)	5.1 mm (0.20 in)	46 years	20 of 100 (Routine)
10 September 2005	San Marcos, MX	daily rain	37.8 mm (1.5 in)	13.9 mm (0.5 in)	46 years	32 of 100 (Routine)
16 July 2005	San Marcos, MX	daily rain	57.9 mm (2.3 in)	19.0 mm (0.7 in)	15 years	30 of 100 (Routine)
4 February 2005	San Marcos, MX	daily rain	7.9 mm (0.31 in)	3.1 mm (0.12 in)	26 years	16 of 100 (Routine)
3 February 2005	San Marcos, MX	daily rain	6.4 mm (0.25 in)	0.6 mm (0.02 in)	40 years	18 of 100 (Routine)
22 January 2005	San Marcos, MX	daily rain	15.7 mm (0.6 in)	10.9 mm (0.4 in)	18 years	20 of 100 (Routine)
19 August 2004	San Marcos, MX	daily rain	42.9 mm (1.7 in)	25.1 mm (1.0 in)	46 years	43 of 100 (Notable)
22 July 2004	San Marcos, MX	daily rain	41.9 mm (1.6 in)	11.9 mm (0.5 in)	1 year	18 of 100 (Routine)
21 July 2004	San Marcos, MX	daily rain	19.3 mm (0.8 in)	4.8 mm (0.19 in)	12 years	14 of 100 (Routine)
24 June 2004	San Marcos, MX	daily rain	31.0 mm (1.2 in)	9.2 mm (0.36 in)	33 years	22 of 100 (Routine)
2 June 2004	San Marcos, MX	daily rain	15.7 mm (0.6 in)	5.8 mm (0.23 in)	10 years	13 of 100 (Routine)
3 May 2004	San Marcos, MX	daily rain	15.0 mm (0.6 in)	11.2 mm (0.4 in)	38 years	20 of 100 (Routine)
18 April 2004	San Marcos, MX	daily rain	7.4 mm (0.29 in)	3.1 mm (0.12 in)	58 years	20 of 100 (Routine)
30 March 2004	San Marcos, MX	daily rain	0.8 mm (0.03 in)	0.8 mm (0.03 in)	62 years	20 of 100 (Routine)
29 March 2004	San Marcos, MX	daily rain	24.4 mm (1.0 in)	24.4 mm (1.0 in)	62 years	20 of 100 (Routine)
22 March 2004	San Marcos, MX	daily rain	9.9 mm (0.39 in)	4.1 mm (0.16 in)	37 years	20 of 100 (Routine)
20 March 2004	San Marcos, MX	daily rain	24.9 mm (1.0 in)	24.9 mm (1.0 in)	62 years	20 of 100 (Routine)

Extremes by Year

1942 to 2006

Yearly extremes at San Marcos: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	40.6 C (105.1 F)	2003	38.9 C (102.0 F)	7
Coldest night (TNn)	-8.3 C (17.1 F)	2006	-5.0 C (23.0 F)	7
Wettest day (Rx1day)	177.5 mm (7.0 in)	1943	41.9 mm (1.6 in)	65
Wettest five days (Rx5day)	206.7 mm (8.1 in)	1943	73.9 mm (2.9 in)	65
Longest dry spell (CDD)	173 days	1969	82 days	65

Hottest day (TXx)

The hottest day of the year at San Marcos, 1942 to 2006. The record is 40.6 C (105.1 F) in 2003, marked on the chart; the median year is 38.9 C (102.0 F).

Hottest day (TXx) at San Marcos by year
Year	Hottest day (TXx)
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	n/a
1978	n/a
1979	n/a
1980	n/a
1981	n/a
1982	n/a
1983	n/a
1984	n/a
1985	n/a
1986	n/a
1987	n/a
1988	n/a
1989	n/a
1990	n/a
1991	n/a
1992	n/a
1993	n/a
1994	n/a
1995	n/a
1996	n/a
1997	n/a
1998	n/a
1999	n/a
2000	31.7 C (89.1 F)
2001	36.7 C (98.1 F)
2002	40.0 C (104.0 F)
2003	40.6 C (105.1 F)
2004	38.9 C (102.0 F)
2005	40.0 C (104.0 F)
2006	36.7 C (98.1 F)

Coldest night (TNn)

The coldest night of the year at San Marcos, 1942 to 2006. The record is -8.3 C (17.1 F) in 2006, marked on the chart; the median year is -5.0 C (23.0 F).

Coldest night (TNn) at San Marcos by year
Year	Coldest night (TNn)
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	n/a
1978	n/a
1979	n/a
1980	n/a
1981	n/a
1982	n/a
1983	n/a
1984	n/a
1985	n/a
1986	n/a
1987	n/a
1988	n/a
1989	n/a
1990	n/a
1991	n/a
1992	n/a
1993	n/a
1994	n/a
1995	n/a
1996	n/a
1997	n/a
1998	n/a
1999	n/a
2000	2.8 C (37.0 F)
2001	-6.1 C (21.0 F)
2002	-5.0 C (23.0 F)
2003	-5.0 C (23.0 F)
2004	-4.4 C (24.1 F)
2005	-5.0 C (23.0 F)
2006	-8.3 C (17.1 F)

Wettest day (Rx1day)

The wettest day of the year at San Marcos, 1942 to 2006. The record is 177.5 mm (7.0 in) in 1943, marked on the chart; the median year is 41.9 mm (1.6 in).

Wettest day (Rx1day) at San Marcos by year
Year	Wettest day (Rx1day)
1942	60.5 mm (2.4 in)
1943	177.5 mm (7.0 in)
1944	17.8 mm (0.7 in)
1945	28.7 mm (1.1 in)
1946	37.1 mm (1.5 in)
1947	43.4 mm (1.7 in)
1948	35.3 mm (1.4 in)
1949	32.3 mm (1.3 in)
1950	19.8 mm (0.8 in)
1951	49.8 mm (2.0 in)
1952	20.3 mm (0.8 in)
1953	49.3 mm (1.9 in)
1954	79.5 mm (3.1 in)
1955	26.9 mm (1.1 in)
1956	55.4 mm (2.2 in)
1957	13.5 mm (0.5 in)
1958	35.3 mm (1.4 in)
1959	34.8 mm (1.4 in)
1960	30.0 mm (1.2 in)
1961	42.4 mm (1.7 in)
1962	24.9 mm (1.0 in)
1963	40.9 mm (1.6 in)
1964	96.8 mm (3.8 in)
1965	43.9 mm (1.7 in)
1966	37.8 mm (1.5 in)
1967	50.3 mm (2.0 in)
1968	46.0 mm (1.8 in)
1969	28.4 mm (1.1 in)
1970	47.8 mm (1.9 in)
1971	48.8 mm (1.9 in)
1972	48.3 mm (1.9 in)
1973	63.0 mm (2.5 in)
1974	57.4 mm (2.3 in)
1975	37.3 mm (1.5 in)
1976	45.0 mm (1.8 in)
1977	25.4 mm (1.0 in)
1978	63.5 mm (2.5 in)
1979	41.9 mm (1.6 in)
1980	20.8 mm (0.8 in)
1981	29.0 mm (1.1 in)
1982	45.0 mm (1.8 in)
1983	50.8 mm (2.0 in)
1984	22.9 mm (0.9 in)
1985	63.8 mm (2.5 in)
1986	35.8 mm (1.4 in)
1987	57.4 mm (2.3 in)
1988	43.9 mm (1.7 in)
1989	34.3 mm (1.4 in)
1990	38.9 mm (1.5 in)
1991	51.8 mm (2.0 in)
1992	52.8 mm (2.1 in)
1993	48.3 mm (1.9 in)
1994	56.4 mm (2.2 in)
1995	29.0 mm (1.1 in)
1996	39.9 mm (1.6 in)
1997	21.3 mm (0.8 in)
1998	35.8 mm (1.4 in)
1999	31.8 mm (1.3 in)
2000	34.8 mm (1.4 in)
2001	39.4 mm (1.6 in)
2002	50.8 mm (2.0 in)
2003	59.9 mm (2.4 in)
2004	42.9 mm (1.7 in)
2005	57.9 mm (2.3 in)
2006	23.9 mm (0.9 in)

Wettest five days (Rx5day)

The wettest five days of the year at San Marcos, 1942 to 2006. The record is 206.7 mm (8.1 in) in 1943, marked on the chart; the median year is 73.9 mm (2.9 in).

Wettest five days (Rx5day) at San Marcos by year
Year	Wettest five days (Rx5day)
1942	107.2 mm (4.2 in)
1943	206.7 mm (8.1 in)
1944	35.4 mm (1.4 in)
1945	45.2 mm (1.8 in)
1946	58.6 mm (2.3 in)
1947	75.6 mm (3.0 in)
1948	55.4 mm (2.2 in)
1949	32.3 mm (1.3 in)
1950	37.8 mm (1.5 in)
1951	86.4 mm (3.4 in)
1952	32.0 mm (1.3 in)
1953	67.6 mm (2.7 in)
1954	100.4 mm (4.0 in)
1955	44.4 mm (1.7 in)
1956	73.9 mm (2.9 in)
1957	23.6 mm (0.9 in)
1958	84.1 mm (3.3 in)
1959	64.7 mm (2.5 in)
1960	90.7 mm (3.6 in)
1961	69.3 mm (2.7 in)
1962	32.0 mm (1.3 in)
1963	90.2 mm (3.6 in)
1964	117.1 mm (4.6 in)
1965	68.6 mm (2.7 in)
1966	62.5 mm (2.5 in)
1967	145.6 mm (5.7 in)
1968	107.0 mm (4.2 in)
1969	41.2 mm (1.6 in)
1970	135.2 mm (5.3 in)
1971	108.2 mm (4.3 in)
1972	51.5 mm (2.0 in)
1973	173.0 mm (6.8 in)
1974	90.4 mm (3.6 in)
1975	76.5 mm (3.0 in)
1976	136.0 mm (5.4 in)
1977	37.3 mm (1.5 in)
1978	117.6 mm (4.6 in)
1979	61.7 mm (2.4 in)
1980	60.0 mm (2.4 in)
1981	64.4 mm (2.5 in)
1982	56.3 mm (2.2 in)
1983	82.6 mm (3.3 in)
1984	59.9 mm (2.4 in)
1985	87.2 mm (3.4 in)
1986	74.2 mm (2.9 in)
1987	125.5 mm (4.9 in)
1988	80.4 mm (3.2 in)
1989	61.8 mm (2.4 in)
1990	88.7 mm (3.5 in)
1991	97.9 mm (3.9 in)
1992	67.9 mm (2.7 in)
1993	116.4 mm (4.6 in)
1994	66.6 mm (2.6 in)
1995	37.6 mm (1.5 in)
1996	112.3 mm (4.4 in)
1997	36.5 mm (1.4 in)
1998	72.6 mm (2.9 in)
1999	78.3 mm (3.1 in)
2000	90.2 mm (3.6 in)
2001	52.7 mm (2.1 in)
2002	78.5 mm (3.1 in)
2003	164.0 mm (6.5 in)
2004	67.6 mm (2.7 in)
2005	94.8 mm (3.7 in)
2006	57.7 mm (2.3 in)

Longest dry spell (CDD)

The longest dry spell of the year at San Marcos, 1942 to 2006. The record is 173 days in 1969, marked on the chart; the median year is 82 days.

Longest dry spell (CDD) at San Marcos by year
Year	Longest dry spell (CDD)
1942	80 days
1943	150 days
1944	107 days
1945	81 days
1946	87 days
1947	111 days
1948	102 days
1949	91 days
1950	88 days
1951	86 days
1952	95 days
1953	52 days
1954	103 days
1955	55 days
1956	135 days
1957	78 days
1958	41 days
1959	65 days
1960	151 days
1961	81 days
1962	70 days
1963	92 days
1964	77 days
1965	71 days
1966	77 days
1967	58 days
1968	75 days
1969	173 days
1970	90 days
1971	131 days
1972	41 days
1973	80 days
1974	73 days
1975	118 days
1976	163 days
1977	78 days
1978	98 days
1979	93 days
1980	89 days
1981	46 days
1982	112 days
1983	129 days
1984	103 days
1985	84 days
1986	63 days
1987	53 days
1988	95 days
1989	104 days
1990	82 days
1991	158 days
1992	43 days
1993	51 days
1994	55 days
1995	144 days
1996	70 days
1997	36 days
1998	79 days
1999	157 days
2000	70 days
2001	82 days
2002	50 days
2003	109 days
2004	64 days
2005	77 days
2006	74 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Rainfall Return Levels

59 years, 1943 to 2005

A day with at least 39.4 mm (1.6 in) of rain is expected about once in 2 years. A day with at least 116.8 mm (4.6 in) of rain is expected about once in 100 years.

Rainfall return levels at San Marcos: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	39.4 mm (1.6 in)
5 years	56.5 mm (2.2 in)
10 years	69.1 mm (2.7 in)
25 years	86.7 mm (3.4 in)
50 years	101.2 mm (4.0 in)
100 years	116.8 mm (4.6 in)	Longer than the 59 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 59 years of values from 1943 to 2005.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 177.5 mm (7.0 in) in 1943; 96.8 mm (3.8 in) in 1964; 79.5 mm (3.1 in) in 1954.

Download the Data

Data for San Marcos standing records by year: CSV or JSON. Field meanings are on the data page.
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). Records are computed by this site and are not official.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Year	Days with data	Share of year	Complete
2000	91	25%	No
2001	304	83%	No
2002	359	98%	Yes
2003	359	98%	Yes
2004	304	83%	No
2005	365	100%	Yes
2006	150	41%	No