San Marcos Weather Records (MXN00018080)

Record envelope, standing records and threshold days for San Marcos (MXN00018080), Mexico, with 33 years of record.

Key Facts for San Marcos

San Marcos (MXN00018080) is a weather station in Mexico at 20.95 latitude and -105.35 longitude, 7 m (22 ft) above sea level.
The station reports from 1981 to 2013, 33 years of record.
1,464 records set at San Marcos still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Mexico, 20.95 latitude, -105.35 longitude.
Elevation: 7 m (22 ft).
Period of record: 1981 to 2013, 33 years.
Eligible elements: none yet.

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	40.0 C (104.0 F)	5.6 C (42.1 F)	n/a	n/a
Feb	38.3 C (100.9 F)	5.6 C (42.1 F)	n/a	n/a
Mar	38.9 C (102.0 F)	5.6 C (42.1 F)	n/a	n/a
Apr	39.4 C (102.9 F)	6.7 C (44.1 F)	n/a	n/a
May	41.1 C (106.0 F)	8.3 C (46.9 F)	n/a	n/a
Jun	41.1 C (106.0 F)	12.8 C (55.0 F)	n/a	n/a
Jul	42.8 C (109.0 F)	11.7 C (53.1 F)	n/a	n/a
Aug	42.8 C (109.0 F)	11.7 C (53.1 F)	n/a	n/a
Sep	43.9 C (111.0 F)	10.6 C (51.1 F)	n/a	n/a
Oct	41.7 C (107.1 F)	13.9 C (57.0 F)	n/a	n/a
Nov	40.6 C (105.1 F)	7.8 C (46.0 F)	n/a	n/a
Dec	40.0 C (104.0 F)	5.6 C (42.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at San Marcos still stand. 1998 holds the most, with 249.

Standing records at San Marcos by the year they were set
Year set	Standing records
1981	148
1982	84
1983	35
1984	73
1985	23
1990	1
1991	57
1992	76
1993	25
1994	46
1995	95
1996	161
1997	61
1998	249
1999	2
2000	1
2001	47
2002	74
2004	41
2005	66
2006	3
2007	2
2008	6
2009	9
2011	41
2012	31
2013	7

Wettest Day of Each Month

Sep: 180.1 mm (7.1 in)

The wettest day on record for each calendar month at San Marcos. The most was 180.1 mm (7.1 in) on 23 September 2013.

Record daily precipitation for each month at San Marcos
Month	Record daily precipitation (mm)	Date
Jan	54.9 mm (2.2 in)	11 January 2004
Feb	28.4 mm (1.1 in)	1 February 1997
Mar	16.0 mm (0.6 in)	21 March 1997
Apr	17.3 mm (0.7 in)	3 April 1997
May	24.9 mm (1.0 in)	9 May 1992
Jun	119.9 mm (4.7 in)	30 June 1991
Jul	149.4 mm (5.9 in)	10 July 1998
Aug	165.9 mm (6.5 in)	21 August 2004
Sep	180.1 mm (7.1 in)	23 September 2013
Oct	174.8 mm (6.9 in)	24 October 2002
Nov	123.2 mm (4.9 in)	5 November 2002
Dec	79.8 mm (3.1 in)	13 December 1992

Period of Record Coverage

1981 to 2013

28 years of record at San Marcos, 1981 to 2013. 13 years have data for under 90 percent of days and are left out of rankings: 1981, 1982, 1983, 1984, 1985, 1990, 1991, 1993 and others.

Days with data per year at San Marcos
Year	Days with data	Share of year	Complete
1981	316	87%	No
1982	301	82%	No
1983	252	69%	No
1984	302	83%	No
1985	59	16%	No
1990	61	17%	No
1991	303	83%	No
1992	362	99%	Yes
1993	305	84%	No
1994	364	100%	Yes
1995	365	100%	Yes
1996	366	100%	Yes
1997	365	100%	Yes
1998	365	100%	Yes
1999	151	41%	No
2000	213	58%	No
2001	365	100%	Yes
2002	359	98%	Yes
2003	151	41%	No
2004	366	100%	Yes
2005	365	100%	Yes
2006	343	94%	Yes
2007	322	88%	No
2008	365	100%	Yes
2009	361	99%	Yes
2011	350	96%	Yes
2012	356	97%	Yes
2013	277	76%	No

Latest Records

No records were set at this station in the latest data.

Climate Trend

12 complete years, 1992 to 2009

One stripe for each of 12 complete years at San Marcos, 1992 to 2009. Blue stripes are years cooler than the station's own mean of 26.8 C (80.2 F); red stripes are warmer. The coolest year was 1998, at 23.3 C (74.0 F), and the warmest was 1992, at 28.6 C (83.5 F). The strongest colour marks a difference of 3.5 C (6.3 F).

Annual mean temperature at San Marcos as warming stripes, 1992 to 2009
Year	Annual mean temperature	Difference from the station mean
1992	28.6 C	+1.81 C
1994	28.1 C	+1.36 C
1995	27.8 C	+1.01 C
1996	26.1 C	-0.70 C
1997	25.2 C	-1.60 C
1998	23.3 C	-3.46 C
2001	27.5 C	+0.71 C
2002	28.0 C	+1.24 C
2004	28.6 C	+1.78 C
2005	28.4 C	+1.60 C
2008	24.6 C	-2.21 C
2009	25.3 C	-1.52 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

1981 to 2013

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)	43.9 C (111.0 F)	2005	38.6 C (101.5 F)	28
Coldest night (TNn)	5.6 C (42.1 F)	1997	10.0 C (50.0 F)	28
Wettest day (Rx1day)	180.1 mm (7.1 in)	2013	91.4 mm (3.6 in)	30
Wettest five days (Rx5day)	370.8 mm (14.6 in)	1988	158.1 mm (6.2 in)	30
Longest dry spell (CDD)	184 days	2005	107 days	30

Hottest day (TXx)

The hottest day of the year at San Marcos, 1981 to 2013. The record is 43.9 C (111.0 F) in 2005, marked on the chart; the median year is 38.6 C (101.5 F).

Hottest day (TXx) at San Marcos by year
Year	Hottest day (TXx)
1981	35.0 C (95.0 F)
1982	37.8 C (100.0 F)
1983	36.7 C (98.1 F)
1984	32.8 C (91.0 F)
1985	28.9 C (84.0 F)
1988	n/a
1989	n/a
1990	37.8 C (100.0 F)
1991	41.7 C (107.1 F)
1992	40.6 C (105.1 F)
1993	40.0 C (104.0 F)
1994	40.0 C (104.0 F)
1995	41.1 C (106.0 F)
1996	41.1 C (106.0 F)
1997	41.1 C (106.0 F)
1998	40.6 C (105.1 F)
1999	37.8 C (100.0 F)
2000	39.4 C (102.9 F)
2001	40.6 C (105.1 F)
2002	40.6 C (105.1 F)
2003	35.0 C (95.0 F)
2004	40.6 C (105.1 F)
2005	43.9 C (111.0 F)
2006	39.4 C (102.9 F)
2007	37.8 C (100.0 F)
2008	36.7 C (98.1 F)
2009	35.6 C (96.1 F)
2011	35.6 C (96.1 F)
2012	36.7 C (98.1 F)
2013	35.0 C (95.0 F)

Coldest night (TNn)

The coldest night of the year at San Marcos, 1981 to 2013. The record is 5.6 C (42.1 F) in 1997, marked on the chart; the median year is 10.0 C (50.0 F).

Coldest night (TNn) at San Marcos by year
Year	Coldest night (TNn)
1981	10.0 C (50.0 F)
1982	10.6 C (51.1 F)
1983	12.8 C (55.0 F)
1984	10.0 C (50.0 F)
1985	10.6 C (51.1 F)
1988	n/a
1989	n/a
1990	12.8 C (55.0 F)
1991	6.7 C (44.1 F)
1992	10.6 C (51.1 F)
1993	10.0 C (50.0 F)
1994	10.6 C (51.1 F)
1995	10.0 C (50.0 F)
1996	7.8 C (46.0 F)
1997	5.6 C (42.1 F)
1998	5.6 C (42.1 F)
1999	8.9 C (48.0 F)
2000	7.8 C (46.0 F)
2001	12.2 C (54.0 F)
2002	8.9 C (48.0 F)
2003	7.8 C (46.0 F)
2004	15.0 C (59.0 F)
2005	15.6 C (60.1 F)
2006	10.0 C (50.0 F)
2007	10.6 C (51.1 F)
2008	7.8 C (46.0 F)
2009	11.7 C (53.1 F)
2011	10.0 C (50.0 F)
2012	8.9 C (48.0 F)
2013	10.6 C (51.1 F)

Wettest day (Rx1day)

The wettest day of the year at San Marcos, 1981 to 2013. The record is 180.1 mm (7.1 in) in 2013, marked on the chart; the median year is 91.4 mm (3.6 in).

Wettest day (Rx1day) at San Marcos by year
Year	Wettest day (Rx1day)
1981	40.9 mm (1.6 in)
1982	39.9 mm (1.6 in)
1983	51.8 mm (2.0 in)
1984	99.8 mm (3.9 in)
1985	23.1 mm (0.9 in)
1988	160.3 mm (6.3 in)
1989	119.9 mm (4.7 in)
1990	100.3 mm (3.9 in)
1991	119.9 mm (4.7 in)
1992	105.9 mm (4.2 in)
1993	59.9 mm (2.4 in)
1994	96.8 mm (3.8 in)
1995	66.8 mm (2.6 in)
1996	82.8 mm (3.3 in)
1997	81.5 mm (3.2 in)
1998	149.4 mm (5.9 in)
1999	0.0 mm (0.00 in)
2000	57.9 mm (2.3 in)
2001	164.8 mm (6.5 in)
2002	174.8 mm (6.9 in)
2003	0.0 mm (0.00 in)
2004	165.9 mm (6.5 in)
2005	86.1 mm (3.4 in)
2006	41.4 mm (1.6 in)
2007	130.3 mm (5.1 in)
2008	113.3 mm (4.5 in)
2009	110.2 mm (4.3 in)
2011	54.9 mm (2.2 in)
2012	79.8 mm (3.1 in)
2013	180.1 mm (7.1 in)

Wettest five days (Rx5day)

The wettest five days of the year at San Marcos, 1981 to 2013. The record is 370.8 mm (14.6 in) in 1988, marked on the chart; the median year is 158.1 mm (6.2 in).

Wettest five days (Rx5day) at San Marcos by year
Year	Wettest five days (Rx5day)
1981	108.4 mm (4.3 in)
1982	93.0 mm (3.7 in)
1983	121.4 mm (4.8 in)
1984	161.3 mm (6.4 in)
1985	52.3 mm (2.1 in)
1988	370.8 mm (14.6 in)
1989	156.7 mm (6.2 in)
1990	111.2 mm (4.4 in)
1991	259.4 mm (10.2 in)
1992	147.8 mm (5.8 in)
1993	122.7 mm (4.8 in)
1994	207.5 mm (8.2 in)
1995	170.5 mm (6.7 in)
1996	175.3 mm (6.9 in)
1997	159.5 mm (6.3 in)
1998	185.2 mm (7.3 in)
1999	0.0 mm (0.00 in)
2000	118.6 mm (4.7 in)
2001	301.3 mm (11.9 in)
2002	270.6 mm (10.7 in)
2003	0.0 mm (0.00 in)
2004	215.5 mm (8.5 in)
2005	212.4 mm (8.4 in)
2006	78.3 mm (3.1 in)
2007	138.2 mm (5.4 in)
2008	275.8 mm (10.9 in)
2009	254.5 mm (10.0 in)
2011	115.5 mm (4.5 in)
2012	136.2 mm (5.4 in)
2013	221.3 mm (8.7 in)

Longest dry spell (CDD)

The longest dry spell of the year at San Marcos, 1981 to 2013. The record is 184 days in 2005, marked on the chart; the median year is 107 days.

Longest dry spell (CDD) at San Marcos by year
Year	Longest dry spell (CDD)
1981	59 days
1982	167 days
1983	69 days
1984	121 days
1985	27 days
1988	31 days
1989	90 days
1990	61 days
1991	59 days
1992	95 days
1993	81 days
1994	181 days
1995	167 days
1996	97 days
1997	59 days
1998	104 days
1999	151 days
2000	121 days
2001	90 days
2002	117 days
2003	151 days
2004	128 days
2005	184 days
2006	176 days
2007	128 days
2008	76 days
2009	136 days
2011	109 days
2012	99 days
2013	115 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.

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 2026-10-16 (16 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).