Chilcuautla Weather Records (MXN00013097)

Record envelope, standing records and threshold days for Chilcuautla (MXN00013097), Mexico, with 39 years of record.

Key Facts for Chilcuautla

Chilcuautla (MXN00013097) is a weather station in Mexico at 20.32 latitude and -99.22 longitude, 1,854 m (6,082 ft) above sea level.
The station reports from 1974 to 2012, 39 years of record.
1,464 records set at Chilcuautla still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Chilcuautla tied a daily record precipitation of 4.3 mm (0.17 in) on 10 March 2012.

About the Station

Location: Mexico, 20.32 latitude, -99.22 longitude.
Elevation: 1,854 m (6,082 ft).
Period of record: 1974 to 2012, 39 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 Chilcuautla. 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 Chilcuautla, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	32.8 C (91.0 F)	-7.2 C (19.0 F)	n/a	n/a
Feb	33.9 C (93.0 F)	-5.0 C (23.0 F)	n/a	n/a
Mar	35.0 C (95.0 F)	-5.0 C (23.0 F)	n/a	n/a
Apr	35.6 C (96.1 F)	0.0 C (32.0 F)	n/a	n/a
May	36.7 C (98.1 F)	1.7 C (35.1 F)	n/a	n/a
Jun	36.7 C (98.1 F)	1.7 C (35.1 F)	n/a	n/a
Jul	32.8 C (91.0 F)	2.8 C (37.0 F)	n/a	n/a
Aug	32.8 C (91.0 F)	0.6 C (33.1 F)	n/a	n/a
Sep	31.7 C (89.1 F)	0.6 C (33.1 F)	n/a	n/a
Oct	32.8 C (91.0 F)	-3.3 C (26.1 F)	n/a	n/a
Nov	30.6 C (87.1 F)	-4.4 C (24.1 F)	n/a	n/a
Dec	31.7 C (89.1 F)	-6.1 C (21.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Chilcuautla still stand. 1978 holds the most, with 97.

Standing records at Chilcuautla by the year they were set
Year set	Standing records
1974	35
1975	42
1976	53
1977	72
1978	97
1979	79
1980	59
1981	54
1982	24
1983	50
1984	29
1985	30
1986	47
1987	56
1988	37
1989	35
1990	16
1991	20
1992	17
1993	12
1994	7
1995	17
1996	16
1997	22
1998	25
1999	24
2000	19
2001	19
2002	74
2003	84
2004	55
2005	14
2006	41
2007	18
2008	16
2009	9
2010	76
2011	63
2012	1

Wettest Day of Each Month

May: 79.8 mm (3.1 in)

The wettest day on record for each calendar month at Chilcuautla. The most was 79.8 mm (3.1 in) on 25 May 1980.

Record daily precipitation for each month at Chilcuautla
Month	Record daily precipitation (mm)	Date
Jan	28.4 mm (1.1 in)	28 January 1992
Feb	22.9 mm (0.9 in)	5 February 1989
Mar	32.3 mm (1.3 in)	12 March 2004
Apr	39.9 mm (1.6 in)	20 April 1982
May	79.8 mm (3.1 in)	25 May 1980
Jun	53.6 mm (2.1 in)	29 June 1995
Jul	65.8 mm (2.6 in)	30 July 1992
Aug	75.7 mm (3.0 in)	6 August 1989
Sep	72.9 mm (2.9 in)	21 September 1989
Oct	39.9 mm (1.6 in)	8 October 1994
Nov	26.2 mm (1.0 in)	10 November 1987
Dec	26.2 mm (1.0 in)	3 December 1979

Period of Record Coverage

1974 to 2012

39 years of record at Chilcuautla, 1974 to 2012. 16 years have data for under 90 percent of days and are left out of rankings: 1974, 1975, 1981, 1982, 1984, 1991, 1996, 1997 and others.

Days with data per year at Chilcuautla
Year	Days with data	Share of year	Complete
1974	253	69%	No
1975	302	83%	No
1976	366	100%	Yes
1977	333	91%	Yes
1978	333	91%	Yes
1979	363	99%	Yes
1980	359	98%	Yes
1981	320	88%	No
1982	319	87%	No
1983	355	97%	Yes
1984	319	87%	No
1985	364	100%	Yes
1986	365	100%	Yes
1987	365	100%	Yes
1988	366	100%	Yes
1989	365	100%	Yes
1990	364	100%	Yes
1991	318	87%	No
1992	353	96%	Yes
1993	334	92%	Yes
1994	352	96%	Yes
1995	356	98%	Yes
1996	295	81%	No
1997	242	66%	No
1998	335	92%	Yes
1999	319	87%	No
2000	365	100%	Yes
2001	184	50%	No
2002	337	92%	Yes
2003	304	83%	No
2004	336	92%	Yes
2005	304	83%	No
2006	303	83%	No
2007	303	83%	No
2008	305	83%	No
2009	365	100%	Yes
2010	360	99%	Yes
2011	364	100%	Yes
2012	121	33%	No

Latest Records

Latest records at Chilcuautla
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
10 March 2012	Chilcuautla, MX	daily rain (Tie)	4.3 mm (0.17 in)	tie	37 years	3 of 100 (Routine)
2 March 2012	Chilcuautla, MX	daily high max (Tie)	30.6 C (87.1 F)	tie	34 years	3 of 100 (Routine)
29 February 2012	Chilcuautla, MX	daily low max	21.7 C (71.1 F)	2.2 C (4.0 F)	8 years	10 of 100 (Routine)
21 January 2012	Chilcuautla, MX	daily high max (Tie)	28.9 C (84.0 F)	tie	8 years	1 of 100 (Routine)
5 December 2011	Chilcuautla, MX	daily high max (Tie)	27.8 C (82.0 F)	tie	32 years	3 of 100 (Routine)
4 December 2011	Chilcuautla, MX	daily high max	28.9 C (84.0 F)	1.1 C (2.0 F)	28 years	14 of 100 (Routine)
3 December 2011	Chilcuautla, MX	daily low min	0.0 C (32.0 F)	0.6 C (1.1 F)	18 years	10 of 100 (Routine)
3 December 2011	Chilcuautla, MX	daily high max (Tie)	27.8 C (82.0 F)	tie	13 years	1 of 100 (Routine)
2 December 2011	Chilcuautla, MX	daily low min	0.0 C (32.0 F)	0.6 C (1.1 F)	18 years	10 of 100 (Routine)
22 October 2011	Chilcuautla, MX	daily low min (Tie)	0.6 C (33.1 F)	tie	21 years	2 of 100 (Routine)
30 September 2011	Chilcuautla, MX	daily low min (Tie)	2.8 C (37.0 F)	tie	32 years	3 of 100 (Routine)
29 September 2011	Chilcuautla, MX	daily low min	1.7 C (35.1 F)	2.2 C (4.0 F)	16 years	16 of 100 (Routine)
28 September 2011	Chilcuautla, MX	daily low min	2.8 C (37.0 F)	1.1 C (2.0 F)	32 years	16 of 100 (Routine)
27 September 2011	Chilcuautla, MX	daily low min (Tie)	1.7 C (35.1 F)	tie	32 years	3 of 100 (Routine)
22 September 2011	Chilcuautla, MX	daily low min	1.7 C (35.1 F)	1.1 C (2.0 F)	12 years	10 of 100 (Routine)
21 September 2011	Chilcuautla, MX	daily low min	1.7 C (35.1 F)	2.2 C (4.0 F)	8 years	13 of 100 (Routine)
20 September 2011	Chilcuautla, MX	daily low min (Tie)	2.8 C (37.0 F)	tie	8 years	1 of 100 (Routine)
19 September 2011	Chilcuautla, MX	daily low min	2.8 C (37.0 F)	1.1 C (2.0 F)	8 years	9 of 100 (Routine)
16 September 2011	Chilcuautla, MX	daily low min (Tie)	3.9 C (39.0 F)	tie	8 years	1 of 100 (Routine)
15 September 2011	Chilcuautla, MX	daily low min (Tie)	2.8 C (37.0 F)	tie	8 years	1 of 100 (Routine)

Climate Trend

14 complete years, 1976 to 2011

One stripe for each of 14 complete years at Chilcuautla, 1976 to 2011. Blue stripes are years cooler than the station's own mean of 16.4 C (61.5 F); red stripes are warmer. The coolest year was 2010, at 14.3 C (57.8 F), and the warmest was 1980, at 18.0 C (64.4 F). The strongest colour marks a difference of 2.1 C (3.8 F).

Annual mean temperature at Chilcuautla as warming stripes, 1976 to 2011
Year	Annual mean temperature	Difference from the station mean
1976	16.5 C	+0.07 C
1979	17.2 C	+0.81 C
1980	18.0 C	+1.57 C
1983	16.8 C	+0.35 C
1985	16.4 C	-0.05 C
1986	16.5 C	+0.07 C
1987	16.5 C	+0.09 C
1988	16.7 C	+0.27 C
1989	16.4 C	0.00 C
1990	16.5 C	+0.12 C
2000	16.1 C	-0.34 C
2009	16.6 C	+0.16 C
2010	14.3 C	-2.08 C
2011	15.4 C	-1.01 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

1974 to 2012

Yearly extremes at Chilcuautla: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	36.7 C (98.1 F)	1975	33.9 C (93.0 F)	39
Coldest night (TNn)	-7.2 C (19.0 F)	1985	-2.2 C (28.0 F)	39
Wettest day (Rx1day)	79.8 mm (3.1 in)	1980	32.3 mm (1.3 in)	39
Wettest five days (Rx5day)	108.5 mm (4.3 in)	1998	60.8 mm (2.4 in)	39
Longest dry spell (CDD)	213 days	2002	62 days	39

Hottest day (TXx)

The hottest day of the year at Chilcuautla, 1974 to 2012. The record is 36.7 C (98.1 F) in 1975, marked on the chart; the median year is 33.9 C (93.0 F).

Hottest day (TXx) at Chilcuautla by year
Year	Hottest day (TXx)
1974	33.9 C (93.0 F)
1975	36.7 C (98.1 F)
1976	35.6 C (96.1 F)
1977	35.6 C (96.1 F)
1978	36.7 C (98.1 F)
1979	35.0 C (95.0 F)
1980	35.6 C (96.1 F)
1981	33.9 C (93.0 F)
1982	35.0 C (95.0 F)
1983	36.7 C (98.1 F)
1984	33.9 C (93.0 F)
1985	33.9 C (93.0 F)
1986	33.9 C (93.0 F)
1987	33.9 C (93.0 F)
1988	35.0 C (95.0 F)
1989	36.7 C (98.1 F)
1990	35.6 C (96.1 F)
1991	33.9 C (93.0 F)
1992	32.8 C (91.0 F)
1993	32.8 C (91.0 F)
1994	33.9 C (93.0 F)
1995	31.7 C (89.1 F)
1996	32.8 C (91.0 F)
1997	32.8 C (91.0 F)
1998	35.0 C (95.0 F)
1999	31.7 C (89.1 F)
2000	31.7 C (89.1 F)
2001	35.6 C (96.1 F)
2002	31.7 C (89.1 F)
2003	31.7 C (89.1 F)
2004	32.8 C (91.0 F)
2005	30.6 C (87.1 F)
2006	31.7 C (89.1 F)
2007	32.8 C (91.0 F)
2008	32.8 C (91.0 F)
2009	33.9 C (93.0 F)
2010	35.6 C (96.1 F)
2011	35.6 C (96.1 F)
2012	30.6 C (87.1 F)

Coldest night (TNn)

The coldest night of the year at Chilcuautla, 1974 to 2012. The record is -7.2 C (19.0 F) in 1985, marked on the chart; the median year is -2.2 C (28.0 F).

Coldest night (TNn) at Chilcuautla by year
Year	Coldest night (TNn)
1974	-1.7 C (28.9 F)
1975	-3.3 C (26.1 F)
1976	-5.0 C (23.0 F)
1977	0.0 C (32.0 F)
1978	-1.1 C (30.0 F)
1979	0.0 C (32.0 F)
1980	0.0 C (32.0 F)
1981	-1.1 C (30.0 F)
1982	-3.3 C (26.1 F)
1983	-6.1 C (21.0 F)
1984	-3.3 C (26.1 F)
1985	-7.2 C (19.0 F)
1986	-6.1 C (21.0 F)
1987	-5.0 C (23.0 F)
1988	-7.2 C (19.0 F)
1989	-4.4 C (24.1 F)
1990	-2.2 C (28.0 F)
1991	0.0 C (32.0 F)
1992	-2.2 C (28.0 F)
1993	0.0 C (32.0 F)
1994	0.0 C (32.0 F)
1995	0.0 C (32.0 F)
1996	-6.1 C (21.0 F)
1997	-6.1 C (21.0 F)
1998	-2.2 C (28.0 F)
1999	-3.3 C (26.1 F)
2000	-3.3 C (26.1 F)
2001	-4.4 C (24.1 F)
2002	0.0 C (32.0 F)
2003	-6.1 C (21.0 F)
2004	-1.1 C (30.0 F)
2005	-2.2 C (28.0 F)
2006	-2.2 C (28.0 F)
2007	-3.3 C (26.1 F)
2008	0.6 C (33.1 F)
2009	-1.1 C (30.0 F)
2010	-2.2 C (28.0 F)
2011	0.0 C (32.0 F)
2012	0.6 C (33.1 F)

Wettest day (Rx1day)

The wettest day of the year at Chilcuautla, 1974 to 2012. The record is 79.8 mm (3.1 in) in 1980, marked on the chart; the median year is 32.3 mm (1.3 in).

Wettest day (Rx1day) at Chilcuautla by year
Year	Wettest day (Rx1day)
1974	24.9 mm (1.0 in)
1975	30.0 mm (1.2 in)
1976	61.5 mm (2.4 in)
1977	20.8 mm (0.8 in)
1978	27.4 mm (1.1 in)
1979	37.3 mm (1.5 in)
1980	79.8 mm (3.1 in)
1981	70.1 mm (2.8 in)
1982	41.9 mm (1.6 in)
1983	26.4 mm (1.0 in)
1984	49.8 mm (2.0 in)
1985	35.1 mm (1.4 in)
1986	33.3 mm (1.3 in)
1987	30.7 mm (1.2 in)
1988	65.3 mm (2.6 in)
1989	75.7 mm (3.0 in)
1990	58.9 mm (2.3 in)
1991	32.3 mm (1.3 in)
1992	65.8 mm (2.6 in)
1993	55.4 mm (2.2 in)
1994	51.8 mm (2.0 in)
1995	53.6 mm (2.1 in)
1996	25.4 mm (1.0 in)
1997	36.3 mm (1.4 in)
1998	72.9 mm (2.9 in)
1999	52.8 mm (2.1 in)
2000	30.0 mm (1.2 in)
2001	40.4 mm (1.6 in)
2002	22.9 mm (0.9 in)
2003	32.3 mm (1.3 in)
2004	32.3 mm (1.3 in)
2005	25.9 mm (1.0 in)
2006	31.2 mm (1.2 in)
2007	25.4 mm (1.0 in)
2008	20.8 mm (0.8 in)
2009	30.0 mm (1.2 in)
2010	19.8 mm (0.8 in)
2011	30.0 mm (1.2 in)
2012	4.3 mm (0.17 in)

Wettest five days (Rx5day)

The wettest five days of the year at Chilcuautla, 1974 to 2012. The record is 108.5 mm (4.3 in) in 1998, marked on the chart; the median year is 60.8 mm (2.4 in).

Wettest five days (Rx5day) at Chilcuautla by year
Year	Wettest five days (Rx5day)
1974	70.5 mm (2.8 in)
1975	51.9 mm (2.0 in)
1976	97.5 mm (3.8 in)
1977	33.5 mm (1.3 in)
1978	59.1 mm (2.3 in)
1979	62.2 mm (2.4 in)
1980	98.9 mm (3.9 in)
1981	70.1 mm (2.8 in)
1982	49.8 mm (2.0 in)
1983	42.2 mm (1.7 in)
1984	62.2 mm (2.4 in)
1985	60.8 mm (2.4 in)
1986	49.3 mm (1.9 in)
1987	40.1 mm (1.6 in)
1988	95.5 mm (3.8 in)
1989	90.5 mm (3.6 in)
1990	62.0 mm (2.4 in)
1991	78.3 mm (3.1 in)
1992	86.8 mm (3.4 in)
1993	76.0 mm (3.0 in)
1994	87.9 mm (3.5 in)
1995	71.2 mm (2.8 in)
1996	65.1 mm (2.6 in)
1997	45.5 mm (1.8 in)
1998	108.5 mm (4.3 in)
1999	88.8 mm (3.5 in)
2000	60.0 mm (2.4 in)
2001	40.4 mm (1.6 in)
2002	41.7 mm (1.6 in)
2003	47.0 mm (1.9 in)
2004	47.0 mm (1.9 in)
2005	30.2 mm (1.2 in)
2006	47.1 mm (1.9 in)
2007	35.3 mm (1.4 in)
2008	24.6 mm (1.0 in)
2009	33.8 mm (1.3 in)
2010	81.3 mm (3.2 in)
2011	70.6 mm (2.8 in)
2012	6.1 mm (0.24 in)

Longest dry spell (CDD)

The longest dry spell of the year at Chilcuautla, 1974 to 2012. The record is 213 days in 2002, marked on the chart; the median year is 62 days.

Longest dry spell (CDD) at Chilcuautla by year
Year	Longest dry spell (CDD)
1974	32 days
1975	92 days
1976	39 days
1977	80 days
1978	28 days
1979	62 days
1980	37 days
1981	37 days
1982	59 days
1983	54 days
1984	58 days
1985	53 days
1986	78 days
1987	109 days
1988	42 days
1989	55 days
1990	71 days
1991	109 days
1992	46 days
1993	47 days
1994	32 days
1995	36 days
1996	87 days
1997	69 days
1998	136 days
1999	39 days
2000	71 days
2001	51 days
2002	213 days
2003	68 days
2004	102 days
2005	61 days
2006	80 days
2007	138 days
2008	107 days
2009	82 days
2010	94 days
2011	104 days
2012	14 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

30 years, 1975 to 2011

A day with at least 37.4 mm (1.5 in) of rain is expected about once in 2 years. A day with at least 109.2 mm (4.3 in) of rain is expected about once in 100 years.

Rainfall return levels at Chilcuautla: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	37.4 mm (1.5 in)
5 years	54.0 mm (2.1 in)
10 years	66.0 mm (2.6 in)
25 years	82.3 mm (3.2 in)
50 years	95.4 mm (3.8 in)	Longer than the 30 years of record
100 years	109.2 mm (4.3 in)	Longer than the 30 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, 30 years of values from 1975 to 2011.

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: 79.8 mm (3.1 in) in 1980; 75.7 mm (3.0 in) in 1989; 72.9 mm (2.9 in) in 1998.

Download the Data

Data for Chilcuautla standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Chilcuautla 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 2026-10-15 (15 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).