San Marcos Weather Records (MXN00014129)

Record envelope, standing records and threshold days for San Marcos (MXN00014129), Mexico, with 52 years of record.

Key Facts for San Marcos

San Marcos (MXN00014129) is a weather station in Mexico at 19.43 latitude and -103.50 longitude, 1,120 m (3,674 ft) above sea level.
The station reports from 1961 to 2012, 52 years of record.
1,464 records set at San Marcos still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
San Marcos set a daily record low maximum temperature of 23.9 C (75.0 F) on 30 January 2012.

About the Station

Location: Mexico, 19.43 latitude, -103.50 longitude.
Elevation: 1,120 m (3,674 ft).
Period of record: 1961 to 2012, 52 years.
Eligible elements: tmax, tmin, 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	45.0 C (113.0 F)	0.0 C (32.0 F)	n/a	n/a
Feb	43.9 C (111.0 F)	1.7 C (35.1 F)	n/a	n/a
Mar	40.6 C (105.1 F)	1.7 C (35.1 F)	n/a	n/a
Apr	42.8 C (109.0 F)	1.7 C (35.1 F)	n/a	n/a
May	42.8 C (109.0 F)	1.7 C (35.1 F)	n/a	n/a
Jun	41.7 C (107.1 F)	1.7 C (35.1 F)	n/a	n/a
Jul	47.8 C (118.0 F)	3.9 C (39.0 F)	n/a	n/a
Aug	41.7 C (107.1 F)	2.8 C (37.0 F)	n/a	n/a
Sep	40.6 C (105.1 F)	6.7 C (44.1 F)	n/a	n/a
Oct	40.0 C (104.0 F)	5.0 C (41.0 F)	n/a	n/a
Nov	38.9 C (102.0 F)	2.8 C (37.0 F)	n/a	n/a
Dec	45.6 C (114.1 F)	0.6 C (33.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at San Marcos still stand. 1969 holds the most, with 150.

Standing records at San Marcos by the year they were set
Year set	Standing records
1961	5
1962	98
1963	95
1964	86
1965	62
1966	60
1967	55
1969	150
1970	14
1971	7
1972	12
1973	4
1974	7
1975	9
1976	15
1977	2
1978	17
1979	29
1980	40
1981	14
1982	18
1983	17
1984	13
1985	27
1986	25
1987	40
1988	12
1989	12
1990	16
1991	15
1992	30
1993	19
1994	138
1995	63
1997	113
1998	57
2011	66
2012	2

All-Time Record Progression

3 new records

3 all-time records were set at San Marcos between 10 July 1997 and 5 September 1999. Each dot is a new record.

When San Marcos set new all-time records
Date	Kind	Detail
1997-07-10	Record high maximum temperature	Record high maximum temperature 45.6 C (114.1 F)
1997-07-23	Record high maximum temperature	Record high maximum temperature 47.8 C (118.0 F)
1999-09-05	Record daily precipitation	Record daily precipitation 197.9 mm (7.8 in)

Wettest Day of Each Month

Sep: 197.9 mm (7.8 in)

The wettest day on record for each calendar month at San Marcos. The most was 197.9 mm (7.8 in) on 5 September 1999.

Record daily precipitation for each month at San Marcos
Month	Record daily precipitation (mm)	Date
Jan	149.9 mm (5.9 in)	25 January 1992
Feb	82.8 mm (3.3 in)	2 February 2010
Mar	31.8 mm (1.3 in)	2 March 2001
Apr	8.9 mm (0.35 in)	13 April 1962
May	106.4 mm (4.2 in)	26 May 1983
Jun	85.9 mm (3.4 in)	23 June 2004
Jul	154.9 mm (6.1 in)	11 July 1974
Aug	95.0 mm (3.7 in)	19 August 2003
Sep	197.9 mm (7.8 in)	5 September 1999
Oct	154.9 mm (6.1 in)	11 October 2011
Nov	152.4 mm (6.0 in)	26 November 1982
Dec	59.9 mm (2.4 in)	14 December 1992

Period of Record Coverage

1961 to 2012

38 years of record at San Marcos, 1961 to 2012. 12 years have data for under 90 percent of days and are left out of rankings: 1961, 1962, 1963, 1964, 1965, 1966, 1970, 1971 and others.

Days with data per year at San Marcos
Year	Days with data	Share of year	Complete
1961	17	5%	No
1962	181	50%	No
1963	214	59%	No
1964	305	83%	No
1965	304	83%	No
1966	232	64%	No
1967	351	96%	Yes
1969	346	95%	Yes
1970	243	67%	No
1971	153	42%	No
1972	365	100%	Yes
1973	365	100%	Yes
1974	364	100%	Yes
1975	365	100%	Yes
1976	366	100%	Yes
1977	341	93%	Yes
1978	358	98%	Yes
1979	363	99%	Yes
1980	366	100%	Yes
1981	365	100%	Yes
1982	365	100%	Yes
1983	365	100%	Yes
1984	366	100%	Yes
1985	365	100%	Yes
1986	365	100%	Yes
1987	365	100%	Yes
1988	366	100%	Yes
1989	365	100%	Yes
1990	335	92%	Yes
1991	334	92%	Yes
1992	365	100%	Yes
1993	365	100%	Yes
1994	365	100%	Yes
1995	365	100%	Yes
1997	169	46%	No
1998	242	66%	No
2011	287	79%	No
2012	31	8%	No

Latest Records

Latest records at San Marcos
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
30 January 2012	San Marcos, MX	daily low max	23.9 C (75.0 F)	0.5 C (0.9 F)	41 years	18 of 100 (Routine)
28 January 2012	San Marcos, MX	daily low min (Tie)	5.0 C (41.0 F)	tie	32 years	3 of 100 (Routine)
19 January 2012	San Marcos, MX	daily low min (Tie)	3.9 C (39.0 F)	tie	16 years	2 of 100 (Routine)
18 January 2012	San Marcos, MX	daily low min (Tie)	3.9 C (39.0 F)	tie	16 years	2 of 100 (Routine)
10 January 2012	San Marcos, MX	daily low min (Tie)	3.9 C (39.0 F)	tie	42 years	4 of 100 (Routine)
4 January 2012	San Marcos, MX	daily low min	3.9 C (39.0 F)	1.7 C (3.1 F)	42 years	23 of 100 (Routine)
3 January 2012	San Marcos, MX	daily low min (Tie)	5.0 C (41.0 F)	tie	17 years	2 of 100 (Routine)
2 January 2012	San Marcos, MX	daily low min (Tie)	3.9 C (39.0 F)	tie	36 years	3 of 100 (Routine)
1 January 2012	San Marcos, MX	daily low min (Tie)	5.0 C (41.0 F)	tie	36 years	3 of 100 (Routine)
29 December 2011	San Marcos, MX	daily low max	20.0 C (68.0 F)	1.7 C (3.1 F)	41 years	21 of 100 (Routine)
24 December 2011	San Marcos, MX	daily low min	3.9 C (39.0 F)	1.1 C (2.0 F)	38 years	20 of 100 (Routine)
23 December 2011	San Marcos, MX	daily low min (Tie)	3.9 C (39.0 F)	tie	16 years	2 of 100 (Routine)
22 December 2011	San Marcos, MX	daily low min	3.9 C (39.0 F)	1.1 C (2.0 F)	38 years	20 of 100 (Routine)
21 December 2011	San Marcos, MX	daily low min (Tie)	3.9 C (39.0 F)	tie	16 years	2 of 100 (Routine)
12 December 2011	San Marcos, MX	daily low min (Tie)	5.6 C (42.1 F)	tie	41 years	4 of 100 (Routine)
9 December 2011	San Marcos, MX	daily low min (Tie)	5.0 C (41.0 F)	tie	41 years	4 of 100 (Routine)
8 December 2011	San Marcos, MX	daily low min (Tie)	5.6 C (42.1 F)	tie	41 years	4 of 100 (Routine)
7 December 2011	San Marcos, MX	daily low min (Tie)	5.0 C (41.0 F)	tie	28 years	3 of 100 (Routine)
6 December 2011	San Marcos, MX	daily low min (Tie)	3.9 C (39.0 F)	tie	28 years	3 of 100 (Routine)
3 December 2011	San Marcos, MX	daily low min	3.9 C (39.0 F)	1.1 C (2.0 F)	16 years	14 of 100 (Routine)

Climate Trend

22 complete years, 1967 to 1995

One stripe for each of 22 complete years at San Marcos, 1967 to 1995. Blue stripes are years cooler than the station's own mean of 22.1 C (71.7 F); red stripes are warmer. The coolest year was 1967, at 20.9 C (69.6 F), and the warmest was 1979, at 23.6 C (74.6 F). The strongest colour marks a difference of 1.6 C (2.9 F).

Annual mean temperature at San Marcos as warming stripes, 1967 to 1995
Year	Annual mean temperature	Difference from the station mean
1967	20.9 C	-1.20 C
1972	22.8 C	+0.74 C
1973	21.4 C	-0.70 C
1974	21.3 C	-0.76 C
1975	21.2 C	-0.86 C
1976	21.0 C	-1.11 C
1978	22.0 C	-0.06 C
1979	23.6 C	+1.57 C
1980	23.5 C	+1.40 C
1981	22.3 C	+0.18 C
1982	22.7 C	+0.65 C
1983	21.7 C	-0.36 C
1984	21.9 C	-0.13 C
1985	22.4 C	+0.37 C
1986	22.3 C	+0.27 C
1987	22.8 C	+0.76 C
1988	22.8 C	+0.73 C
1989	22.6 C	+0.52 C
1992	21.7 C	-0.39 C
1993	22.1 C	-0.02 C
1994	21.1 C	-0.94 C
1995	21.4 C	-0.72 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1961 to 2012

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)	47.8 C (118.0 F)	1997	39.2 C (102.6 F)	38
Coldest night (TNn)	0.0 C (32.0 F)	1969	3.9 C (39.0 F)	38
Wettest day (Rx1day)	197.9 mm (7.8 in)	1999	71.9 mm (2.8 in)	51
Wettest five days (Rx5day)	303.3 mm (11.9 in)	1999	137.9 mm (5.4 in)	51
Longest dry spell (CDD)	163 days	1989	107 days	51

Hottest day (TXx)

The hottest day of the year at San Marcos, 1961 to 2012. The record is 47.8 C (118.0 F) in 1997, marked on the chart; the median year is 39.2 C (102.6 F).

Hottest day (TXx) at San Marcos by year
Year	Hottest day (TXx)
1961	30.0 C (86.0 F)
1962	30.6 C (87.1 F)
1963	31.7 C (89.1 F)
1964	33.9 C (93.0 F)
1965	32.8 C (91.0 F)
1966	32.2 C (90.0 F)
1967	35.6 C (96.1 F)
1969	33.3 C (91.9 F)
1970	33.3 C (91.9 F)
1971	35.0 C (95.0 F)
1972	37.8 C (100.0 F)
1973	36.7 C (98.1 F)
1974	36.1 C (97.0 F)
1975	37.8 C (100.0 F)
1976	35.6 C (96.1 F)
1977	37.8 C (100.0 F)
1978	36.7 C (98.1 F)
1979	40.6 C (105.1 F)
1980	41.7 C (107.1 F)
1981	40.6 C (105.1 F)
1982	40.6 C (105.1 F)
1983	40.6 C (105.1 F)
1984	41.7 C (107.1 F)
1985	41.7 C (107.1 F)
1986	42.8 C (109.0 F)
1987	42.8 C (109.0 F)
1988	41.7 C (107.1 F)
1989	41.7 C (107.1 F)
1990	41.7 C (107.1 F)
1991	42.8 C (109.0 F)
1992	40.6 C (105.1 F)
1993	41.7 C (107.1 F)
1994	41.7 C (107.1 F)
1995	40.6 C (105.1 F)
1996	n/a
1997	47.8 C (118.0 F)
1998	45.0 C (113.0 F)
1999	n/a
2000	n/a
2001	n/a
2002	n/a
2003	n/a
2004	n/a
2005	n/a
2006	n/a
2007	n/a
2008	n/a
2009	n/a
2010	n/a
2011	37.8 C (100.0 F)
2012	30.6 C (87.1 F)

Coldest night (TNn)

The coldest night of the year at San Marcos, 1961 to 2012. The record is 0.0 C (32.0 F) in 1969, marked on the chart; the median year is 3.9 C (39.0 F).

Coldest night (TNn) at San Marcos by year
Year	Coldest night (TNn)
1961	10.0 C (50.0 F)
1962	8.3 C (46.9 F)
1963	8.9 C (48.0 F)
1964	6.7 C (44.1 F)
1965	7.8 C (46.0 F)
1966	10.0 C (50.0 F)
1967	6.7 C (44.1 F)
1969	0.0 C (32.0 F)
1970	7.2 C (45.0 F)
1971	5.6 C (42.1 F)
1972	5.0 C (41.0 F)
1973	2.8 C (37.0 F)
1974	5.6 C (42.1 F)
1975	2.8 C (37.0 F)
1976	3.9 C (39.0 F)
1977	5.0 C (41.0 F)
1978	2.8 C (37.0 F)
1979	5.6 C (42.1 F)
1980	5.0 C (41.0 F)
1981	1.7 C (35.1 F)
1982	2.8 C (37.0 F)
1983	1.7 C (35.1 F)
1984	5.0 C (41.0 F)
1985	3.9 C (39.0 F)
1986	1.7 C (35.1 F)
1987	3.9 C (39.0 F)
1988	1.7 C (35.1 F)
1989	3.9 C (39.0 F)
1990	1.7 C (35.1 F)
1991	2.8 C (37.0 F)
1992	1.7 C (35.1 F)
1993	2.8 C (37.0 F)
1994	1.7 C (35.1 F)
1995	1.7 C (35.1 F)
1996	n/a
1997	5.6 C (42.1 F)
1998	1.7 C (35.1 F)
1999	n/a
2000	n/a
2001	n/a
2002	n/a
2003	n/a
2004	n/a
2005	n/a
2006	n/a
2007	n/a
2008	n/a
2009	n/a
2010	n/a
2011	2.8 C (37.0 F)
2012	2.8 C (37.0 F)

Wettest day (Rx1day)

The wettest day of the year at San Marcos, 1961 to 2012. The record is 197.9 mm (7.8 in) in 1999, marked on the chart; the median year is 71.9 mm (2.8 in).

Wettest day (Rx1day) at San Marcos by year
Year	Wettest day (Rx1day)
1961	43.9 mm (1.7 in)
1962	50.8 mm (2.0 in)
1963	74.4 mm (2.9 in)
1964	55.6 mm (2.2 in)
1965	74.4 mm (2.9 in)
1966	79.8 mm (3.1 in)
1967	116.3 mm (4.6 in)
1969	61.5 mm (2.4 in)
1970	44.7 mm (1.8 in)
1971	85.3 mm (3.4 in)
1972	81.8 mm (3.2 in)
1973	77.0 mm (3.0 in)
1974	154.9 mm (6.1 in)
1975	48.3 mm (1.9 in)
1976	95.8 mm (3.8 in)
1977	45.5 mm (1.8 in)
1978	68.3 mm (2.7 in)
1979	58.4 mm (2.3 in)
1980	64.3 mm (2.5 in)
1981	64.8 mm (2.6 in)
1982	152.4 mm (6.0 in)
1983	106.4 mm (4.2 in)
1984	84.8 mm (3.3 in)
1985	49.3 mm (1.9 in)
1986	64.8 mm (2.6 in)
1987	103.9 mm (4.1 in)
1988	81.8 mm (3.2 in)
1989	63.8 mm (2.5 in)
1990	53.8 mm (2.1 in)
1991	49.3 mm (1.9 in)
1992	149.9 mm (5.9 in)
1993	47.8 mm (1.9 in)
1994	29.0 mm (1.1 in)
1995	52.8 mm (2.1 in)
1996	79.8 mm (3.1 in)
1997	75.9 mm (3.0 in)
1998	57.9 mm (2.3 in)
1999	197.9 mm (7.8 in)
2000	71.9 mm (2.8 in)
2001	74.9 mm (2.9 in)
2002	81.8 mm (3.2 in)
2003	95.0 mm (3.7 in)
2004	85.9 mm (3.4 in)
2005	70.9 mm (2.8 in)
2006	82.8 mm (3.3 in)
2007	51.8 mm (2.0 in)
2008	49.8 mm (2.0 in)
2009	50.8 mm (2.0 in)
2010	82.8 mm (3.3 in)
2011	154.9 mm (6.1 in)
2012	0.0 mm (0.00 in)

Wettest five days (Rx5day)

The wettest five days of the year at San Marcos, 1961 to 2012. The record is 303.3 mm (11.9 in) in 1999, marked on the chart; the median year is 137.9 mm (5.4 in).

Wettest five days (Rx5day) at San Marcos by year
Year	Wettest five days (Rx5day)
1961	68.1 mm (2.7 in)
1962	125.3 mm (4.9 in)
1963	155.0 mm (6.1 in)
1964	104.4 mm (4.1 in)
1965	165.6 mm (6.5 in)
1966	140.1 mm (5.5 in)
1967	218.2 mm (8.6 in)
1969	138.2 mm (5.4 in)
1970	120.4 mm (4.7 in)
1971	228.6 mm (9.0 in)
1972	140.4 mm (5.5 in)
1973	116.6 mm (4.6 in)
1974	214.9 mm (8.5 in)
1975	103.2 mm (4.1 in)
1976	193.3 mm (7.6 in)
1977	113.6 mm (4.5 in)
1978	136.0 mm (5.4 in)
1979	125.3 mm (4.9 in)
1980	154.0 mm (6.1 in)
1981	136.2 mm (5.4 in)
1982	180.8 mm (7.1 in)
1983	213.3 mm (8.4 in)
1984	136.1 mm (5.4 in)
1985	134.1 mm (5.3 in)
1986	104.0 mm (4.1 in)
1987	216.7 mm (8.5 in)
1988	178.5 mm (7.0 in)
1989	116.4 mm (4.6 in)
1990	137.9 mm (5.4 in)
1991	74.0 mm (2.9 in)
1992	225.6 mm (8.9 in)
1993	129.6 mm (5.1 in)
1994	64.5 mm (2.5 in)
1995	132.3 mm (5.2 in)
1996	168.5 mm (6.6 in)
1997	143.5 mm (5.6 in)
1998	227.4 mm (9.0 in)
1999	303.3 mm (11.9 in)
2000	189.5 mm (7.5 in)
2001	117.3 mm (4.6 in)
2002	103.3 mm (4.1 in)
2003	147.3 mm (5.8 in)
2004	149.1 mm (5.9 in)
2005	93.5 mm (3.7 in)
2006	156.5 mm (6.2 in)
2007	116.1 mm (4.6 in)
2008	121.4 mm (4.8 in)
2009	115.6 mm (4.6 in)
2010	167.3 mm (6.6 in)
2011	203.2 mm (8.0 in)
2012	0.0 mm (0.00 in)

Longest dry spell (CDD)

The longest dry spell of the year at San Marcos, 1961 to 2012. The record is 163 days in 1989, marked on the chart; the median year is 107 days.

Longest dry spell (CDD) at San Marcos by year
Year	Longest dry spell (CDD)
1961	17 days
1962	74 days
1963	39 days
1964	114 days
1965	107 days
1966	78 days
1967	116 days
1969	89 days
1970	123 days
1971	65 days
1972	76 days
1973	62 days
1974	137 days
1975	127 days
1976	113 days
1977	57 days
1978	64 days
1979	109 days
1980	112 days
1981	146 days
1982	136 days
1983	88 days
1984	143 days
1985	143 days
1986	126 days
1987	90 days
1988	96 days
1989	163 days
1990	47 days
1991	160 days
1992	88 days
1993	120 days
1994	151 days
1995	120 days
1996	61 days
1997	31 days
1998	151 days
1999	78 days
2000	142 days
2001	77 days
2002	91 days
2003	120 days
2004	58 days
2005	97 days
2006	91 days
2007	128 days
2008	114 days
2009	137 days
2010	113 days
2011	94 days
2012	31 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

33 years, 1962 to 2009

A day with at least 70.1 mm (2.8 in) of rain is expected about once in 2 years. A day with at least 202.0 mm (8.0 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	70.1 mm (2.8 in)
5 years	95.6 mm (3.8 in)
10 years	115.8 mm (4.6 in)
25 years	145.9 mm (5.7 in)
50 years	172.1 mm (6.8 in)	Longer than the 33 years of record
100 years	202.0 mm (8.0 in)	Longer than the 33 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, 33 years of values from 1962 to 2009.

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: 154.9 mm (6.1 in) in 1974; 152.4 mm (6.0 in) in 1982; 149.9 mm (5.9 in) in 1992.

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).