San Marcos Tlazalpan Weather Records (MXN00015142)

Record envelope, standing records and threshold days for San Marcos Tlazalpan (MXN00015142), Mexico, with 37 years of record.

Key Facts for San Marcos Tlazalpan

San Marcos Tlazalpan (MXN00015142) is a weather station in Mexico at 19.78 latitude and -99.72 longitude, 2,711 m (8,894 ft) above sea level.
The station reports from 1965 to 2001, 37 years of record.
1,464 records set at San Marcos Tlazalpan still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
San Marcos Tlazalpan set a daily record precipitation of 12.4 mm (0.5 in) on 1 July 2000.

About the Station

Location: Mexico, 19.78 latitude, -99.72 longitude.
Elevation: 2,711 m (8,894 ft).
Period of record: 1965 to 2001, 37 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 Tlazalpan. 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 Tlazalpan, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	25.6 C (78.1 F)	-10.0 C (14.0 F)	n/a	n/a
Feb	26.7 C (80.1 F)	-13.3 C (8.1 F)	n/a	n/a
Mar	26.7 C (80.1 F)	-9.4 C (15.1 F)	n/a	n/a
Apr	28.3 C (82.9 F)	-6.1 C (21.0 F)	n/a	n/a
May	29.4 C (84.9 F)	-3.3 C (26.1 F)	n/a	n/a
Jun	27.8 C (82.0 F)	-4.4 C (24.1 F)	n/a	n/a
Jul	25.0 C (77.0 F)	-0.6 C (30.9 F)	n/a	n/a
Aug	25.6 C (78.1 F)	0.0 C (32.0 F)	n/a	n/a
Sep	25.0 C (77.0 F)	-5.0 C (23.0 F)	n/a	n/a
Oct	25.0 C (77.0 F)	-8.3 C (17.1 F)	n/a	n/a
Nov	24.4 C (75.9 F)	-8.3 C (17.1 F)	n/a	n/a
Dec	25.0 C (77.0 F)	-10.6 C (12.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at San Marcos Tlazalpan still stand. 1975 holds the most, with 142.

Standing records at San Marcos Tlazalpan by the year they were set
Year set	Standing records
1973	13
1974	87
1975	142
1976	120
1977	93
1978	109
1979	75
1980	76
1981	52
1982	46
1983	83
1984	13
1985	44
1986	39
1987	69
1988	56
1989	30
1990	22
1991	25
1992	27
1993	20
1994	21
1995	25
1996	29
1997	15
1998	33
1999	58
2000	38
2001	4

Wettest Day of Each Month

Feb: 85.9 mm (3.4 in)

The wettest day on record for each calendar month at San Marcos Tlazalpan. The most was 85.9 mm (3.4 in) on 5 February 1966.

Record daily precipitation for each month at San Marcos Tlazalpan
Month	Record daily precipitation (mm)	Date
Jan	21.8 mm (0.9 in)	25 January 1966
Feb	85.9 mm (3.4 in)	5 February 1966
Mar	24.4 mm (1.0 in)	4 March 1988
Apr	28.2 mm (1.1 in)	30 April 1968
May	37.8 mm (1.5 in)	20 May 1966
Jun	30.0 mm (1.2 in)	24 June 1972
Jul	39.4 mm (1.6 in)	21 July 1981
Aug	55.1 mm (2.2 in)	13 August 1965
Sep	53.8 mm (2.1 in)	26 September 1965
Oct	52.3 mm (2.1 in)	14 October 1966
Nov	23.9 mm (0.9 in)	27 November 1973
Dec	18.3 mm (0.7 in)	1 December 1967

Period of Record Coverage

1973 to 2001

29 years of record at San Marcos Tlazalpan, 1973 to 2001. 7 years have data for under 90 percent of days and are left out of rankings: 1973, 1987, 1988, 1989, 1992, 1995, 2001.

Days with data per year at San Marcos Tlazalpan
Year	Days with data	Share of year	Complete
1973	37	10%	No
1974	365	100%	Yes
1975	365	100%	Yes
1976	364	99%	Yes
1977	363	99%	Yes
1978	364	100%	Yes
1979	365	100%	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	359	98%	Yes
1987	298	82%	No
1988	327	89%	No
1989	327	90%	No
1990	335	92%	Yes
1991	335	92%	Yes
1992	325	89%	No
1993	358	98%	Yes
1994	350	96%	Yes
1995	296	81%	No
1996	362	99%	Yes
1997	360	99%	Yes
1998	360	99%	Yes
1999	362	99%	Yes
2000	361	99%	Yes
2001	30	8%	No

Latest Records

Latest records at San Marcos Tlazalpan
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
1 July 2000	San Marcos Tlazalpan, MX	daily rain	12.4 mm (0.5 in)	3.5 mm (0.14 in)	27 years	16 of 100 (Routine)
21 May 2000	San Marcos Tlazalpan, MX	daily rain	16.0 mm (0.6 in)	7.4 mm (0.29 in)	23 years	20 of 100 (Routine)
25 August 1999	San Marcos Tlazalpan, MX	daily rain	16.0 mm (0.6 in)	2.5 mm (0.10 in)	25 years	13 of 100 (Routine)
24 August 1999	San Marcos Tlazalpan, MX	daily rain	22.4 mm (0.9 in)	6.4 mm (0.25 in)	2 years	11 of 100 (Routine)
23 August 1999	San Marcos Tlazalpan, MX	daily rain	31.0 mm (1.2 in)	15.8 mm (0.6 in)	4 years	26 of 100 (Routine)
14 June 1999	San Marcos Tlazalpan, MX	daily rain (Tie)	9.4 mm (0.37 in)	tie	17 years	2 of 100 (Routine)
16 October 1998	San Marcos Tlazalpan, MX	daily rain	10.2 mm (0.4 in)	8.4 mm (0.33 in)	27 years	20 of 100 (Routine)
3 October 1998	San Marcos Tlazalpan, MX	daily rain	16.0 mm (0.6 in)	8.9 mm (0.35 in)	7 years	16 of 100 (Routine)
19 September 1998	San Marcos Tlazalpan, MX	daily rain	15.0 mm (0.6 in)	1.5 mm (0.06 in)	32 years	14 of 100 (Routine)
18 September 1998	San Marcos Tlazalpan, MX	daily rain	16.8 mm (0.7 in)	11.2 mm (0.4 in)	19 years	20 of 100 (Routine)
17 September 1998	San Marcos Tlazalpan, MX	daily rain	23.4 mm (0.9 in)	6.6 mm (0.26 in)	21 years	18 of 100 (Routine)
18 August 1997	San Marcos Tlazalpan, MX	daily rain	22.4 mm (0.9 in)	13.3 mm (0.5 in)	16 years	20 of 100 (Routine)
22 April 1997	San Marcos Tlazalpan, MX	daily rain	14.2 mm (0.6 in)	8.6 mm (0.34 in)	3 years	17 of 100 (Routine)
23 March 1997	San Marcos Tlazalpan, MX	daily rain	11.2 mm (0.4 in)	6.4 mm (0.25 in)	31 years	20 of 100 (Routine)
24 August 1996	San Marcos Tlazalpan, MX	daily rain	16.0 mm (0.6 in)	3.6 mm (0.14 in)	28 years	15 of 100 (Routine)
31 December 1995	San Marcos Tlazalpan, MX	daily rain	12.4 mm (0.5 in)	11.6 mm (0.5 in)	12 years	20 of 100 (Routine)
30 December 1995	San Marcos Tlazalpan, MX	daily rain	9.4 mm (0.37 in)	7.1 mm (0.28 in)	26 years	20 of 100 (Routine)
19 November 1995	San Marcos Tlazalpan, MX	daily rain	6.4 mm (0.25 in)	3.6 mm (0.14 in)	4 years	11 of 100 (Routine)
18 November 1995	San Marcos Tlazalpan, MX	daily rain	7.1 mm (0.28 in)	7.1 mm (0.28 in)	29 years	20 of 100 (Routine)
16 November 1995	San Marcos Tlazalpan, MX	daily rain	3.3 mm (0.13 in)	2.0 mm (0.08 in)	18 years	12 of 100 (Routine)

Climate Trend

19 complete years, 1974 to 2000

One stripe for each of 19 complete years at San Marcos Tlazalpan, 1974 to 2000. Blue stripes are years cooler than the station's own mean of 11.2 C (52.2 F); red stripes are warmer. The coolest year was 1985, at 10.6 C (51.0 F), and the warmest was 1998, at 12.3 C (54.1 F). The strongest colour marks a difference of 1.1 C (2.0 F).

Annual mean temperature at San Marcos Tlazalpan as warming stripes, 1974 to 2000
Year	Annual mean temperature	Difference from the station mean
1974	10.9 C	-0.28 C
1975	11.0 C	-0.21 C
1976	11.2 C	-0.05 C
1977	11.0 C	-0.24 C
1978	11.5 C	+0.28 C
1979	11.0 C	-0.17 C
1980	11.1 C	-0.11 C
1981	11.3 C	+0.06 C
1982	11.0 C	-0.22 C
1983	11.4 C	+0.16 C
1984	10.9 C	-0.36 C
1985	10.6 C	-0.64 C
1986	11.4 C	+0.15 C
1993	11.3 C	+0.13 C
1996	11.2 C	0.00 C
1997	11.4 C	+0.18 C
1998	12.3 C	+1.08 C
1999	11.3 C	+0.11 C
2000	11.4 C	+0.16 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

1965 to 2001

Yearly extremes at San Marcos Tlazalpan: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	29.4 C (84.9 F)	1978	25.6 C (78.1 F)	29
Coldest night (TNn)	-13.3 C (8.1 F)	1976	-8.3 C (17.1 F)	29
Wettest day (Rx1day)	85.9 mm (3.4 in)	1966	24.4 mm (1.0 in)	37
Wettest five days (Rx5day)	146.5 mm (5.8 in)	1965	57.7 mm (2.3 in)	37
Longest dry spell (CDD)	163 days	1999	61 days	37

Hottest day (TXx)

The hottest day of the year at San Marcos Tlazalpan, 1965 to 2001. The record is 29.4 C (84.9 F) in 1978, marked on the chart; the median year is 25.6 C (78.1 F).

Hottest day (TXx) at San Marcos Tlazalpan by year
Year	Hottest day (TXx)
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	19.4 C (66.9 F)
1974	27.2 C (81.0 F)
1975	28.3 C (82.9 F)
1976	27.8 C (82.0 F)
1977	26.7 C (80.1 F)
1978	29.4 C (84.9 F)
1979	29.4 C (84.9 F)
1980	25.0 C (77.0 F)
1981	25.6 C (78.1 F)
1982	27.2 C (81.0 F)
1983	27.8 C (82.0 F)
1984	27.2 C (81.0 F)
1985	25.0 C (77.0 F)
1986	25.6 C (78.1 F)
1987	25.0 C (77.0 F)
1988	25.6 C (78.1 F)
1989	28.3 C (82.9 F)
1990	25.0 C (77.0 F)
1991	24.4 C (75.9 F)
1992	25.6 C (78.1 F)
1993	25.0 C (77.0 F)
1994	25.0 C (77.0 F)
1995	26.7 C (80.1 F)
1996	25.0 C (77.0 F)
1997	23.9 C (75.0 F)
1998	25.6 C (78.1 F)
1999	25.6 C (78.1 F)
2000	24.4 C (75.9 F)
2001	22.8 C (73.0 F)

Coldest night (TNn)

The coldest night of the year at San Marcos Tlazalpan, 1965 to 2001. The record is -13.3 C (8.1 F) in 1976, marked on the chart; the median year is -8.3 C (17.1 F).

Coldest night (TNn) at San Marcos Tlazalpan by year
Year	Coldest night (TNn)
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	-6.7 C (19.9 F)
1974	-8.3 C (17.1 F)
1975	-10.6 C (12.9 F)
1976	-13.3 C (8.1 F)
1977	-6.1 C (21.0 F)
1978	-7.8 C (18.0 F)
1979	-6.7 C (19.9 F)
1980	-10.0 C (14.0 F)
1981	-7.8 C (18.0 F)
1982	-10.0 C (14.0 F)
1983	-10.6 C (12.9 F)
1984	-6.7 C (19.9 F)
1985	-7.8 C (18.0 F)
1986	-10.0 C (14.0 F)
1987	-10.0 C (14.0 F)
1988	-8.3 C (17.1 F)
1989	-8.3 C (17.1 F)
1990	-9.4 C (15.1 F)
1991	-7.8 C (18.0 F)
1992	-7.8 C (18.0 F)
1993	-8.9 C (16.0 F)
1994	-8.3 C (17.1 F)
1995	-8.3 C (17.1 F)
1996	-7.8 C (18.0 F)
1997	-8.3 C (17.1 F)
1998	-8.9 C (16.0 F)
1999	-10.0 C (14.0 F)
2000	-10.0 C (14.0 F)
2001	-8.9 C (16.0 F)

Wettest day (Rx1day)

The wettest day of the year at San Marcos Tlazalpan, 1965 to 2001. The record is 85.9 mm (3.4 in) in 1966, marked on the chart; the median year is 24.4 mm (1.0 in).

Wettest day (Rx1day) at San Marcos Tlazalpan by year
Year	Wettest day (Rx1day)
1965	55.1 mm (2.2 in)
1966	85.9 mm (3.4 in)
1967	34.8 mm (1.4 in)
1968	38.6 mm (1.5 in)
1969	43.4 mm (1.7 in)
1970	46.5 mm (1.8 in)
1971	40.9 mm (1.6 in)
1972	30.0 mm (1.2 in)
1973	31.0 mm (1.2 in)
1974	40.4 mm (1.6 in)
1975	24.4 mm (1.0 in)
1976	28.2 mm (1.1 in)
1977	29.0 mm (1.1 in)
1978	39.6 mm (1.6 in)
1979	22.4 mm (0.9 in)
1980	27.9 mm (1.1 in)
1981	39.4 mm (1.6 in)
1982	9.7 mm (0.38 in)
1983	9.7 mm (0.38 in)
1984	9.1 mm (0.36 in)
1985	30.7 mm (1.2 in)
1986	21.1 mm (0.8 in)
1987	11.2 mm (0.4 in)
1988	24.4 mm (1.0 in)
1989	21.1 mm (0.8 in)
1990	26.2 mm (1.0 in)
1991	23.4 mm (0.9 in)
1992	20.3 mm (0.8 in)
1993	22.1 mm (0.9 in)
1994	19.3 mm (0.8 in)
1995	17.3 mm (0.7 in)
1996	16.3 mm (0.6 in)
1997	22.4 mm (0.9 in)
1998	23.4 mm (0.9 in)
1999	31.0 mm (1.2 in)
2000	20.3 mm (0.8 in)
2001	0.0 mm (0.00 in)

Wettest five days (Rx5day)

The wettest five days of the year at San Marcos Tlazalpan, 1965 to 2001. The record is 146.5 mm (5.8 in) in 1965, marked on the chart; the median year is 57.7 mm (2.3 in).

Wettest five days (Rx5day) at San Marcos Tlazalpan by year
Year	Wettest five days (Rx5day)
1965	146.5 mm (5.8 in)
1966	93.8 mm (3.7 in)
1967	72.4 mm (2.9 in)
1968	96.5 mm (3.8 in)
1969	103.7 mm (4.1 in)
1970	90.7 mm (3.6 in)
1971	100.0 mm (3.9 in)
1972	68.9 mm (2.7 in)
1973	63.8 mm (2.5 in)
1974	112.8 mm (4.4 in)
1975	65.3 mm (2.6 in)
1976	73.9 mm (2.9 in)
1977	62.8 mm (2.5 in)
1978	62.0 mm (2.4 in)
1979	45.3 mm (1.8 in)
1980	46.2 mm (1.8 in)
1981	39.4 mm (1.6 in)
1982	28.5 mm (1.1 in)
1983	25.9 mm (1.0 in)
1984	20.1 mm (0.8 in)
1985	57.7 mm (2.3 in)
1986	41.4 mm (1.6 in)
1987	25.9 mm (1.0 in)
1988	27.7 mm (1.1 in)
1989	43.0 mm (1.7 in)
1990	44.7 mm (1.8 in)
1991	58.2 mm (2.3 in)
1992	47.0 mm (1.9 in)
1993	38.0 mm (1.5 in)
1994	36.7 mm (1.4 in)
1995	50.8 mm (2.0 in)
1996	45.8 mm (1.8 in)
1997	31.6 mm (1.2 in)
1998	78.3 mm (3.1 in)
1999	88.7 mm (3.5 in)
2000	66.1 mm (2.6 in)
2001	0.0 mm (0.00 in)

Longest dry spell (CDD)

The longest dry spell of the year at San Marcos Tlazalpan, 1965 to 2001. The record is 163 days in 1999, marked on the chart; the median year is 61 days.

Longest dry spell (CDD) at San Marcos Tlazalpan by year
Year	Longest dry spell (CDD)
1965	30 days
1966	63 days
1967	33 days
1968	48 days
1969	33 days
1970	57 days
1971	67 days
1972	41 days
1973	92 days
1974	44 days
1975	45 days
1976	35 days
1977	32 days
1978	33 days
1979	40 days
1980	50 days
1981	43 days
1982	79 days
1983	123 days
1984	132 days
1985	93 days
1986	112 days
1987	77 days
1988	61 days
1989	77 days
1990	50 days
1991	93 days
1992	58 days
1993	88 days
1994	81 days
1995	38 days
1996	120 days
1997	81 days
1998	154 days
1999	163 days
2000	138 days
2001	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

31 years, 1966 to 2000

A day with at least 26.0 mm (1.0 in) of rain is expected about once in 2 years. A day with at least 74.1 mm (2.9 in) of rain is expected about once in 100 years.

Rainfall return levels at San Marcos Tlazalpan: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	26.0 mm (1.0 in)
5 years	37.4 mm (1.5 in)
10 years	45.5 mm (1.8 in)
25 years	56.4 mm (2.2 in)
50 years	65.1 mm (2.6 in)	Longer than the 31 years of record
100 years	74.1 mm (2.9 in)	Longer than the 31 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, 31 years of values from 1966 to 2000.

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: 85.9 mm (3.4 in) in 1966; 46.5 mm (1.8 in) in 1970; 40.9 mm (1.6 in) in 1971.

Download the Data

Data for San Marcos Tlazalpan standing records by year: CSV or JSON. Field meanings are on the data page.
Data for San Marcos Tlazalpan 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).