San Luis Atexcac Weather Records (MXN00021077)

Record envelope, standing records and threshold days for San Luis Atexcac (MXN00021077), Mexico, with 49 years of record.

Key Facts for San Luis Atexcac

San Luis Atexcac (MXN00021077) is a weather station in Mexico at 19.33 latitude and -97.45 longitude, 2,414 m (7,919 ft) above sea level.
The station reports from 1961 to 2009, 49 years of record.
1,464 records set at San Luis Atexcac still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
San Luis Atexcac set a daily record precipitation of 10.4 mm (0.4 in) on 17 December 2009.

About the Station

Location: Mexico, 19.33 latitude, -97.45 longitude.
Elevation: 2,414 m (7,919 ft).
Period of record: 1961 to 2009, 49 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 Luis Atexcac. 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 Luis Atexcac, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	28.9 C (84.0 F)	-8.9 C (16.0 F)	n/a	n/a
Feb	30.0 C (86.0 F)	-7.2 C (19.0 F)	n/a	n/a
Mar	31.7 C (89.1 F)	-4.4 C (24.1 F)	n/a	n/a
Apr	32.2 C (90.0 F)	-2.2 C (28.0 F)	n/a	n/a
May	33.9 C (93.0 F)	0.0 C (32.0 F)	n/a	n/a
Jun	33.9 C (93.0 F)	1.1 C (34.0 F)	n/a	n/a
Jul	30.6 C (87.1 F)	1.1 C (34.0 F)	n/a	n/a
Aug	30.0 C (86.0 F)	0.6 C (33.1 F)	n/a	n/a
Sep	30.0 C (86.0 F)	0.6 C (33.1 F)	n/a	n/a
Oct	30.0 C (86.0 F)	-3.3 C (26.1 F)	n/a	n/a
Nov	29.4 C (84.9 F)	-5.6 C (21.9 F)	n/a	n/a
Dec	27.2 C (81.0 F)	-7.2 C (19.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at San Luis Atexcac still stand. 1987 holds the most, with 136.

Standing records at San Luis Atexcac by the year they were set
Year set	Standing records
1980	52
1981	114
1982	81
1983	71
1984	82
1985	61
1986	93
1987	136
1988	53
1998	20
1999	77
2000	55
2001	60
2002	69
2003	83
2004	75
2005	53
2006	68
2007	50
2008	58
2009	53

Wettest Day of Each Month

Oct: 118.1 mm (4.6 in)

The wettest day on record for each calendar month at San Luis Atexcac. The most was 118.1 mm (4.6 in) on 5 October 1999.

Record daily precipitation for each month at San Luis Atexcac
Month	Record daily precipitation (mm)	Date
Jan	31.0 mm (1.2 in)	30 January 2004
Feb	26.4 mm (1.0 in)	11 February 1983
Mar	22.4 mm (0.9 in)	26 March 1978
Apr	52.3 mm (2.1 in)	6 April 1969
May	40.1 mm (1.6 in)	30 May 2006
Jun	80.8 mm (3.2 in)	17 June 1994
Jul	42.4 mm (1.7 in)	1 July 1988
Aug	64.5 mm (2.5 in)	22 August 2007
Sep	80.8 mm (3.2 in)	22 September 1985
Oct	118.1 mm (4.6 in)	5 October 1999
Nov	41.1 mm (1.6 in)	10 November 1961
Dec	18.3 mm (0.7 in)	20 December 1961

Period of Record Coverage

1980 to 2009

21 years of record at San Luis Atexcac, 1980 to 2009. 5 years have data for under 90 percent of days and are left out of rankings: 1980, 1983, 1984, 1988, 1998.

Days with data per year at San Luis Atexcac
Year	Days with data	Share of year	Complete
1980	214	58%	No
1981	365	100%	Yes
1982	365	100%	Yes
1983	273	75%	No
1984	329	90%	No
1985	358	98%	Yes
1986	357	98%	Yes
1987	358	98%	Yes
1988	239	65%	No
1998	92	25%	No
1999	365	100%	Yes
2000	366	100%	Yes
2001	365	100%	Yes
2002	365	100%	Yes
2003	365	100%	Yes
2004	365	100%	Yes
2005	365	100%	Yes
2006	365	100%	Yes
2007	355	97%	Yes
2008	333	91%	Yes
2009	355	97%	Yes

Latest Records

Latest records at San Luis Atexcac
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 December 2009	San Luis Atexcac, MX	daily rain	10.4 mm (0.4 in)	10.4 mm (0.4 in)	48 years	20 of 100 (Routine)
1 December 2009	San Luis Atexcac, MX	daily rain (Tie)	3.0 mm (0.12 in)	tie	44 years	4 of 100 (Routine)
23 October 2009	San Luis Atexcac, MX	daily rain	9.4 mm (0.37 in)	4.8 mm (0.19 in)	11 years	10 of 100 (Routine)
16 September 2009	San Luis Atexcac, MX	daily rain	35.3 mm (1.4 in)	24.6 mm (1.0 in)	30 years	35 of 100 (Notable)
8 September 2009	San Luis Atexcac, MX	daily rain	12.7 mm (0.5 in)	0.3 mm (0.01 in)	24 years	11 of 100 (Routine)
29 August 2009	San Luis Atexcac, MX	daily rain	21.3 mm (0.8 in)	10.9 mm (0.4 in)	40 years	20 of 100 (Routine)
11 April 2009	San Luis Atexcac, MX	daily rain	15.0 mm (0.6 in)	1.5 mm (0.06 in)	40 years	17 of 100 (Routine)
22 February 2009	San Luis Atexcac, MX	daily rain	11.2 mm (0.4 in)	6.9 mm (0.27 in)	32 years	20 of 100 (Routine)
7 September 2008	San Luis Atexcac, MX	daily rain	39.4 mm (1.6 in)	10.4 mm (0.4 in)	24 years	20 of 100 (Routine)
19 August 2008	San Luis Atexcac, MX	daily rain	32.3 mm (1.3 in)	19.6 mm (0.8 in)	2 years	26 of 100 (Routine)
11 June 2008	San Luis Atexcac, MX	daily rain	26.7 mm (1.1 in)	2.1 mm (0.08 in)	47 years	19 of 100 (Routine)
20 April 2008	San Luis Atexcac, MX	daily rain	8.4 mm (0.33 in)	0.5 mm (0.02 in)	1 year	4 of 100 (Routine)
16 April 2008	San Luis Atexcac, MX	daily rain	14.2 mm (0.6 in)	6.1 mm (0.24 in)	34 years	20 of 100 (Routine)
12 March 2008	San Luis Atexcac, MX	daily rain	4.6 mm (0.18 in)	0.5 mm (0.02 in)	36 years	14 of 100 (Routine)
22 October 2007	San Luis Atexcac, MX	daily rain	16.0 mm (0.6 in)	11.4 mm (0.4 in)	20 years	18 of 100 (Routine)
19 October 2007	San Luis Atexcac, MX	daily rain	19.1 mm (0.8 in)	7.7 mm (0.30 in)	41 years	20 of 100 (Routine)
2 September 2007	San Luis Atexcac, MX	daily rain	27.4 mm (1.1 in)	20.3 mm (0.8 in)	26 years	30 of 100 (Routine)
1 September 2007	San Luis Atexcac, MX	daily rain	18.0 mm (0.7 in)	8.9 mm (0.35 in)	37 years	20 of 100 (Routine)
22 August 2007	San Luis Atexcac, MX	monthly rain	64.5 mm (2.5 in)	10.7 mm (0.4 in)	31 years	36 of 100 (Notable)
17 July 2007	San Luis Atexcac, MX	daily rain	25.4 mm (1.0 in)	19.0 mm (0.7 in)	38 years	38 of 100 (Notable)

Climate Trend

15 complete years, 1981 to 2009

One stripe for each of 15 complete years at San Luis Atexcac, 1981 to 2009. Blue stripes are years cooler than the station's own mean of 14.3 C (57.7 F); red stripes are warmer. The coolest year was 1985, at 13.8 C (56.8 F), and the warmest was 2003, at 15.0 C (58.9 F). The strongest colour marks a difference of 0.7 C (1.3 F).

Annual mean temperature at San Luis Atexcac as warming stripes, 1981 to 2009
Year	Annual mean temperature	Difference from the station mean
1981	14.0 C	-0.33 C
1982	14.4 C	+0.05 C
1985	13.8 C	-0.55 C
1986	14.0 C	-0.26 C
1987	14.4 C	+0.09 C
1999	13.9 C	-0.42 C
2000	14.0 C	-0.31 C
2001	14.0 C	-0.32 C
2002	14.5 C	+0.20 C
2003	15.0 C	+0.67 C
2004	14.5 C	+0.17 C
2005	15.0 C	+0.66 C
2006	14.4 C	+0.09 C
2007	14.5 C	+0.20 C
2009	14.3 C	+0.04 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 2009

Yearly extremes at San Luis Atexcac: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	33.9 C (93.0 F)	2003	31.1 C (88.0 F)	21
Coldest night (TNn)	-8.9 C (16.0 F)	1988	-5.6 C (21.9 F)	21
Wettest day (Rx1day)	118.1 mm (4.6 in)	1999	39.5 mm (1.6 in)	42
Wettest five days (Rx5day)	217.9 mm (8.6 in)	1999	72.8 mm (2.9 in)	42
Longest dry spell (CDD)	115 days	1970	53 days	42

Hottest day (TXx)

The hottest day of the year at San Luis Atexcac, 1961 to 2009. The record is 33.9 C (93.0 F) in 2003, marked on the chart; the median year is 31.1 C (88.0 F).

Hottest day (TXx) at San Luis Atexcac by year
Year	Hottest day (TXx)
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	27.2 C (81.0 F)
1981	29.4 C (84.9 F)
1982	31.1 C (88.0 F)
1983	33.3 C (91.9 F)
1984	31.1 C (88.0 F)
1985	32.2 C (90.0 F)
1986	31.1 C (88.0 F)
1987	30.0 C (86.0 F)
1988	31.7 C (89.1 F)
1993	n/a
1994	n/a
1998	27.2 C (81.0 F)
1999	32.2 C (90.0 F)
2000	30.6 C (87.1 F)
2001	32.2 C (90.0 F)
2002	31.7 C (89.1 F)
2003	33.9 C (93.0 F)
2004	30.6 C (87.1 F)
2005	33.9 C (93.0 F)
2006	31.7 C (89.1 F)
2007	30.6 C (87.1 F)
2008	33.9 C (93.0 F)
2009	30.6 C (87.1 F)

Coldest night (TNn)

The coldest night of the year at San Luis Atexcac, 1961 to 2009. The record is -8.9 C (16.0 F) in 1988, marked on the chart; the median year is -5.6 C (21.9 F).

Coldest night (TNn) at San Luis Atexcac by year
Year	Coldest night (TNn)
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	-6.1 C (21.0 F)
1981	-5.0 C (23.0 F)
1982	-7.2 C (19.0 F)
1983	-3.3 C (26.1 F)
1984	-7.2 C (19.0 F)
1985	-5.0 C (23.0 F)
1986	-6.7 C (19.9 F)
1987	-7.2 C (19.0 F)
1988	-8.9 C (16.0 F)
1993	n/a
1994	n/a
1998	-2.8 C (27.0 F)
1999	-7.2 C (19.0 F)
2000	-4.4 C (24.1 F)
2001	-3.9 C (25.0 F)
2002	-5.6 C (21.9 F)
2003	-7.2 C (19.0 F)
2004	-5.6 C (21.9 F)
2005	-5.0 C (23.0 F)
2006	-7.8 C (18.0 F)
2007	-3.3 C (26.1 F)
2008	-3.3 C (26.1 F)
2009	-5.0 C (23.0 F)

Wettest day (Rx1day)

The wettest day of the year at San Luis Atexcac, 1961 to 2009. The record is 118.1 mm (4.6 in) in 1999, marked on the chart; the median year is 39.5 mm (1.6 in).

Wettest day (Rx1day) at San Luis Atexcac by year
Year	Wettest day (Rx1day)
1961	41.1 mm (1.6 in)
1962	50.3 mm (2.0 in)
1963	32.0 mm (1.3 in)
1964	28.2 mm (1.1 in)
1965	24.9 mm (1.0 in)
1966	49.8 mm (2.0 in)
1967	36.1 mm (1.4 in)
1968	38.4 mm (1.5 in)
1969	52.3 mm (2.1 in)
1970	37.6 mm (1.5 in)
1971	24.4 mm (1.0 in)
1972	25.7 mm (1.0 in)
1973	74.2 mm (2.9 in)
1974	47.2 mm (1.9 in)
1975	29.2 mm (1.1 in)
1976	53.8 mm (2.1 in)
1977	50.8 mm (2.0 in)
1978	65.3 mm (2.6 in)
1979	39.6 mm (1.6 in)
1980	36.3 mm (1.4 in)
1981	30.5 mm (1.2 in)
1982	28.4 mm (1.1 in)
1983	26.4 mm (1.0 in)
1984	32.8 mm (1.3 in)
1985	80.8 mm (3.2 in)
1986	51.8 mm (2.0 in)
1987	23.4 mm (0.9 in)
1988	52.1 mm (2.1 in)
1993	31.0 mm (1.2 in)
1994	80.8 mm (3.2 in)
1998	18.8 mm (0.7 in)
1999	118.1 mm (4.6 in)
2000	63.0 mm (2.5 in)
2001	38.4 mm (1.5 in)
2002	30.0 mm (1.2 in)
2003	66.5 mm (2.6 in)
2004	44.7 mm (1.8 in)
2005	47.5 mm (1.9 in)
2006	42.2 mm (1.7 in)
2007	64.5 mm (2.5 in)
2008	39.4 mm (1.6 in)
2009	35.3 mm (1.4 in)

Wettest five days (Rx5day)

The wettest five days of the year at San Luis Atexcac, 1961 to 2009. The record is 217.9 mm (8.6 in) in 1999, marked on the chart; the median year is 72.8 mm (2.9 in).

Wettest five days (Rx5day) at San Luis Atexcac by year
Year	Wettest five days (Rx5day)
1961	45.7 mm (1.8 in)
1962	87.9 mm (3.5 in)
1963	63.7 mm (2.5 in)
1964	34.6 mm (1.4 in)
1965	68.4 mm (2.7 in)
1966	60.4 mm (2.4 in)
1967	77.0 mm (3.0 in)
1968	119.0 mm (4.7 in)
1969	77.0 mm (3.0 in)
1970	123.2 mm (4.9 in)
1971	54.6 mm (2.1 in)
1972	53.7 mm (2.1 in)
1973	176.1 mm (6.9 in)
1974	100.8 mm (4.0 in)
1975	63.5 mm (2.5 in)
1976	82.4 mm (3.2 in)
1977	69.5 mm (2.7 in)
1978	135.6 mm (5.3 in)
1979	107.9 mm (4.2 in)
1980	67.9 mm (2.7 in)
1981	72.7 mm (2.9 in)
1982	44.7 mm (1.8 in)
1983	30.3 mm (1.2 in)
1984	115.6 mm (4.6 in)
1985	81.1 mm (3.2 in)
1986	66.1 mm (2.6 in)
1987	44.9 mm (1.8 in)
1988	76.2 mm (3.0 in)
1993	64.2 mm (2.5 in)
1994	197.0 mm (7.8 in)
1998	30.3 mm (1.2 in)
1999	217.9 mm (8.6 in)
2000	89.7 mm (3.5 in)
2001	47.3 mm (1.9 in)
2002	62.5 mm (2.5 in)
2003	102.7 mm (4.0 in)
2004	72.9 mm (2.9 in)
2005	66.3 mm (2.6 in)
2006	55.9 mm (2.2 in)
2007	86.3 mm (3.4 in)
2008	85.7 mm (3.4 in)
2009	89.4 mm (3.5 in)

Longest dry spell (CDD)

The longest dry spell of the year at San Luis Atexcac, 1961 to 2009. The record is 115 days in 1970, marked on the chart; the median year is 53 days.

Longest dry spell (CDD) at San Luis Atexcac by year
Year	Longest dry spell (CDD)
1961	51 days
1962	48 days
1963	59 days
1964	44 days
1965	32 days
1966	35 days
1967	41 days
1968	46 days
1969	81 days
1970	115 days
1971	92 days
1972	41 days
1973	60 days
1974	91 days
1975	83 days
1976	56 days
1977	48 days
1978	28 days
1979	41 days
1980	57 days
1981	37 days
1982	70 days
1983	72 days
1984	36 days
1985	52 days
1986	53 days
1987	63 days
1988	38 days
1993	8 days
1994	10 days
1998	36 days
1999	59 days
2000	70 days
2001	59 days
2002	46 days
2003	59 days
2004	78 days
2005	71 days
2006	81 days
2007	35 days
2008	77 days
2009	46 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

37 years, 1961 to 2009

A day with at least 40.6 mm (1.6 in) of rain is expected about once in 2 years. A day with at least 117.7 mm (4.6 in) of rain is expected about once in 100 years.

Rainfall return levels at San Luis Atexcac: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	40.6 mm (1.6 in)
5 years	56.4 mm (2.2 in)
10 years	68.6 mm (2.7 in)
25 years	86.2 mm (3.4 in)
50 years	101.1 mm (4.0 in)	Longer than the 37 years of record
100 years	117.7 mm (4.6 in)	Longer than the 37 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, 37 years of values from 1961 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: 118.1 mm (4.6 in) in 1999; 80.8 mm (3.2 in) in 1985; 74.2 mm (2.9 in) in 1973.

Download the Data

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