Chontalcoatlan Weather Records (MXN00012171)

Record envelope, standing records and threshold days for Chontalcoatlan (MXN00012171), Mexico, with 38 years of record.

Key Facts for Chontalcoatlan

Chontalcoatlan (MXN00012171) is a weather station in Mexico at 18.65 latitude and -99.57 longitude, 1,289 m (4,229 ft) above sea level.
The station reports from 1976 to 2013, 38 years of record.
1,464 records set at Chontalcoatlan still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Chontalcoatlan tied a daily record low minimum temperature of 13.9 C (57.0 F) on 8 July 2013.

About the Station

Location: Mexico, 18.65 latitude, -99.57 longitude.
Elevation: 1,289 m (4,229 ft).
Period of record: 1976 to 2013, 38 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 Chontalcoatlan. 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 Chontalcoatlan, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	35.0 C (95.0 F)	-0.6 C (30.9 F)	n/a	n/a
Feb	36.7 C (98.1 F)	-0.6 C (30.9 F)	n/a	n/a
Mar	40.0 C (104.0 F)	1.7 C (35.1 F)	n/a	n/a
Apr	41.1 C (106.0 F)	4.4 C (39.9 F)	n/a	n/a
May	40.0 C (104.0 F)	7.2 C (45.0 F)	n/a	n/a
Jun	40.0 C (104.0 F)	11.1 C (52.0 F)	n/a	n/a
Jul	38.9 C (102.0 F)	10.0 C (50.0 F)	n/a	n/a
Aug	37.2 C (99.0 F)	10.6 C (51.1 F)	n/a	n/a
Sep	37.2 C (99.0 F)	10.6 C (51.1 F)	n/a	n/a
Oct	34.4 C (93.9 F)	5.6 C (42.1 F)	n/a	n/a
Nov	37.8 C (100.0 F)	0.6 C (33.1 F)	n/a	n/a
Dec	37.2 C (99.0 F)	0.0 C (32.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Chontalcoatlan still stand. 2011 holds the most, with 99.

Standing records at Chontalcoatlan by the year they were set
Year set	Standing records
1976	24
1977	39
1978	35
1979	69
1980	62
1981	56
1982	22
1983	60
1984	58
1985	11
1986	31
1987	49
1988	31
1989	8
1990	6
1991	13
1992	74
1993	46
1994	29
1995	47
1996	27
1997	27
1998	76
1999	35
2000	28
2001	21
2002	76
2003	55
2004	18
2005	61
2006	50
2007	10
2008	5
2009	15
2010	32
2011	99
2012	39
2013	20

All-Time Record Progression

1 new records

1 all-time records were set at Chontalcoatlan between 9 April 2011 and 9 April 2011. Each dot is a new record.

Wettest Day of Each Month

Jun: 89.4 mm (3.5 in)

The wettest day on record for each calendar month at Chontalcoatlan. The most was 89.4 mm (3.5 in) on 16 June 1985.

Record daily precipitation for each month at Chontalcoatlan
Month	Record daily precipitation (mm)	Date
Jan	41.7 mm (1.6 in)	24 January 1980
Feb	52.3 mm (2.1 in)	4 February 2010
Mar	22.4 mm (0.9 in)	2 March 2001
Apr	27.4 mm (1.1 in)	28 April 1987
May	56.6 mm (2.2 in)	20 May 2009
Jun	89.4 mm (3.5 in)	16 June 1985
Jul	82.0 mm (3.2 in)	1 July 1999
Aug	75.7 mm (3.0 in)	5 August 2001
Sep	84.1 mm (3.3 in)	17 September 2010
Oct	81.3 mm (3.2 in)	7 October 2008
Nov	54.1 mm (2.1 in)	3 November 2002
Dec	21.3 mm (0.8 in)	9 December 1978

Period of Record Coverage

1976 to 2013

38 years of record at Chontalcoatlan, 1976 to 2013. 13 years have data for under 90 percent of days and are left out of rankings: 1976, 1985, 1989, 1990, 1991, 1997, 1998, 1999 and others.

Days with data per year at Chontalcoatlan
Year	Days with data	Share of year	Complete
1976	71	19%	No
1977	365	100%	Yes
1978	363	99%	Yes
1979	365	100%	Yes
1980	366	100%	Yes
1981	365	100%	Yes
1982	365	100%	Yes
1983	359	98%	Yes
1984	363	99%	Yes
1985	105	29%	No
1986	346	95%	Yes
1987	365	100%	Yes
1988	336	92%	Yes
1989	120	33%	No
1990	31	8%	No
1991	92	25%	No
1992	366	100%	Yes
1993	351	96%	Yes
1994	337	92%	Yes
1995	329	90%	Yes
1996	343	94%	Yes
1997	275	75%	No
1998	328	90%	No
1999	301	82%	No
2000	327	89%	No
2001	334	92%	Yes
2002	340	93%	Yes
2003	334	92%	Yes
2004	334	91%	Yes
2005	340	93%	Yes
2006	328	90%	No
2007	322	88%	No
2008	203	55%	No
2009	343	94%	Yes
2010	365	100%	Yes
2011	365	100%	Yes
2012	366	100%	Yes
2013	242	66%	No

Latest Records

Latest records at Chontalcoatlan
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
8 July 2013	Chontalcoatlan, MX	daily low min (Tie)	13.9 C (57.0 F)	tie	12 years	1 of 100 (Routine)
1 July 2013	Chontalcoatlan, MX	daily low min (Tie)	15.0 C (59.0 F)	tie	12 years	1 of 100 (Routine)
30 June 2013	Chontalcoatlan, MX	daily low min (Tie)	14.4 C (57.9 F)	tie	27 years	2 of 100 (Routine)
9 June 2013	Chontalcoatlan, MX	daily rain (Tie)	45.0 mm (1.8 in)	tie	20 years	2 of 100 (Routine)
28 April 2013	Chontalcoatlan, MX	daily high min (Tie)	17.2 C (63.0 F)	tie	6 years	1 of 100 (Routine)
27 April 2013	Chontalcoatlan, MX	daily high min	18.3 C (64.9 F)	0.5 C (0.9 F)	35 years	14 of 100 (Routine)
26 April 2013	Chontalcoatlan, MX	daily high min	18.3 C (64.9 F)	1.6 C (2.9 F)	32 years	18 of 100 (Routine)
25 April 2013	Chontalcoatlan, MX	daily high min (Tie)	17.2 C (63.0 F)	tie	10 years	1 of 100 (Routine)
24 April 2013	Chontalcoatlan, MX	daily rain	6.9 mm (0.27 in)	2.1 mm (0.08 in)	27 years	14 of 100 (Routine)
21 April 2013	Chontalcoatlan, MX	daily high max (Tie)	40.0 C (104.0 F)	tie	2 years	0 of 100 (Routine)
20 April 2013	Chontalcoatlan, MX	daily high min (Tie)	17.2 C (63.0 F)	tie	19 years	2 of 100 (Routine)
20 April 2013	Chontalcoatlan, MX	daily high max (Tie)	40.0 C (104.0 F)	tie	2 years	0 of 100 (Routine)
19 April 2013	Chontalcoatlan, MX	daily high min	17.2 C (63.0 F)	0.5 C (0.9 F)	32 years	13 of 100 (Routine)
19 April 2013	Chontalcoatlan, MX	daily high max (Tie)	40.0 C (104.0 F)	tie	15 years	1 of 100 (Routine)
18 April 2013	Chontalcoatlan, MX	daily high max (Tie)	40.0 C (104.0 F)	tie	15 years	1 of 100 (Routine)
5 April 2013	Chontalcoatlan, MX	daily rain	5.8 mm (0.23 in)	5.8 mm (0.23 in)	36 years	20 of 100 (Routine)
17 March 2013	Chontalcoatlan, MX	daily low max	25.0 C (77.0 F)	3.9 C (7.0 F)	34 years	29 of 100 (Routine)
16 March 2013	Chontalcoatlan, MX	daily low max	25.6 C (78.1 F)	3.3 C (5.9 F)	30 years	25 of 100 (Routine)
15 March 2013	Chontalcoatlan, MX	daily low max	24.4 C (75.9 F)	2.8 C (5.0 F)	30 years	23 of 100 (Routine)
15 March 2013	Chontalcoatlan, MX	daily rain	4.6 mm (0.18 in)	3.8 mm (0.15 in)	28 years	16 of 100 (Routine)

Climate Trend

13 complete years, 1977 to 2012

One stripe for each of 13 complete years at Chontalcoatlan, 1977 to 2012. Blue stripes are years cooler than the station's own mean of 21.7 C (71.0 F); red stripes are warmer. The coolest year was 1984, at 20.6 C (69.0 F), and the warmest was 2011, at 23.7 C (74.6 F). The strongest colour marks a difference of 2.0 C (3.6 F).

Annual mean temperature at Chontalcoatlan as warming stripes, 1977 to 2012
Year	Annual mean temperature	Difference from the station mean
1977	21.2 C	-0.47 C
1978	21.3 C	-0.39 C
1979	21.2 C	-0.44 C
1980	21.4 C	-0.31 C
1981	21.4 C	-0.31 C
1982	21.8 C	+0.12 C
1983	21.3 C	-0.33 C
1984	20.6 C	-1.12 C
1987	21.4 C	-0.28 C
1992	21.1 C	-0.58 C
2010	22.5 C	+0.82 C
2011	23.7 C	+1.98 C
2012	23.0 C	+1.31 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

1976 to 2013

Yearly extremes at Chontalcoatlan: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	41.1 C (106.0 F)	2011	38.3 C (100.9 F)	38
Coldest night (TNn)	-0.6 C (30.9 F)	1998	3.9 C (39.0 F)	38
Wettest day (Rx1day)	89.4 mm (3.5 in)	1985	58.1 mm (2.3 in)	38
Wettest five days (Rx5day)	204.5 mm (8.1 in)	1985	125.2 mm (4.9 in)	38
Longest dry spell (CDD)	147 days	1998	63 days	38

Hottest day (TXx)

The hottest day of the year at Chontalcoatlan, 1976 to 2013. The record is 41.1 C (106.0 F) in 2011, marked on the chart; the median year is 38.3 C (100.9 F).

Hottest day (TXx) at Chontalcoatlan by year
Year	Hottest day (TXx)
1976	30.0 C (86.0 F)
1977	36.7 C (98.1 F)
1978	38.9 C (102.0 F)
1979	37.2 C (99.0 F)
1980	37.8 C (100.0 F)
1981	36.7 C (98.1 F)
1982	37.8 C (100.0 F)
1983	38.9 C (102.0 F)
1984	37.8 C (100.0 F)
1985	36.1 C (97.0 F)
1986	37.2 C (99.0 F)
1987	37.8 C (100.0 F)
1988	39.4 C (102.9 F)
1989	38.3 C (100.9 F)
1990	34.4 C (93.9 F)
1991	30.0 C (86.0 F)
1992	36.7 C (98.1 F)
1993	38.3 C (100.9 F)
1994	38.3 C (100.9 F)
1995	38.9 C (102.0 F)
1996	36.1 C (97.0 F)
1997	37.2 C (99.0 F)
1998	40.0 C (104.0 F)
1999	38.3 C (100.9 F)
2000	38.3 C (100.9 F)
2001	38.3 C (100.9 F)
2002	40.0 C (104.0 F)
2003	40.0 C (104.0 F)
2004	37.2 C (99.0 F)
2005	40.0 C (104.0 F)
2006	38.3 C (100.9 F)
2007	39.4 C (102.9 F)
2008	37.2 C (99.0 F)
2009	38.3 C (100.9 F)
2010	40.0 C (104.0 F)
2011	41.1 C (106.0 F)
2012	40.0 C (104.0 F)
2013	40.0 C (104.0 F)

Coldest night (TNn)

The coldest night of the year at Chontalcoatlan, 1976 to 2013. The record is -0.6 C (30.9 F) in 1998, marked on the chart; the median year is 3.9 C (39.0 F).

Coldest night (TNn) at Chontalcoatlan by year
Year	Coldest night (TNn)
1976	5.0 C (41.0 F)
1977	2.8 C (37.0 F)
1978	3.9 C (39.0 F)
1979	3.3 C (37.9 F)
1980	1.7 C (35.1 F)
1981	3.3 C (37.9 F)
1982	0.0 C (32.0 F)
1983	1.1 C (34.0 F)
1984	1.7 C (35.1 F)
1985	5.0 C (41.0 F)
1986	1.7 C (35.1 F)
1987	0.0 C (32.0 F)
1988	0.6 C (33.1 F)
1989	3.9 C (39.0 F)
1990	5.6 C (42.1 F)
1991	5.0 C (41.0 F)
1992	3.9 C (39.0 F)
1993	3.9 C (39.0 F)
1994	5.0 C (41.0 F)
1995	5.0 C (41.0 F)
1996	2.8 C (37.0 F)
1997	2.2 C (36.0 F)
1998	-0.6 C (30.9 F)
1999	-0.6 C (30.9 F)
2000	0.6 C (33.1 F)
2001	2.2 C (36.0 F)
2002	2.2 C (36.0 F)
2003	5.6 C (42.1 F)
2004	5.0 C (41.0 F)
2005	5.0 C (41.0 F)
2006	4.4 C (39.9 F)
2007	6.7 C (44.1 F)
2008	5.6 C (42.1 F)
2009	6.1 C (43.0 F)
2010	3.3 C (37.9 F)
2011	5.0 C (41.0 F)
2012	7.2 C (45.0 F)
2013	5.0 C (41.0 F)

Wettest day (Rx1day)

The wettest day of the year at Chontalcoatlan, 1976 to 2013. The record is 89.4 mm (3.5 in) in 1985, marked on the chart; the median year is 58.1 mm (2.3 in).

Wettest day (Rx1day) at Chontalcoatlan by year
Year	Wettest day (Rx1day)
1976	18.3 mm (0.7 in)
1977	48.3 mm (1.9 in)
1978	49.8 mm (2.0 in)
1979	54.9 mm (2.2 in)
1980	59.2 mm (2.3 in)
1981	71.4 mm (2.8 in)
1982	49.8 mm (2.0 in)
1983	62.0 mm (2.4 in)
1984	67.6 mm (2.7 in)
1985	89.4 mm (3.5 in)
1986	58.4 mm (2.3 in)
1987	58.9 mm (2.3 in)
1988	62.5 mm (2.5 in)
1989	0.0 mm (0.00 in)
1990	0.0 mm (0.00 in)
1991	13.0 mm (0.5 in)
1992	47.5 mm (1.9 in)
1993	60.5 mm (2.4 in)
1994	44.7 mm (1.8 in)
1995	72.4 mm (2.9 in)
1996	54.6 mm (2.1 in)
1997	34.3 mm (1.4 in)
1998	66.3 mm (2.6 in)
1999	82.0 mm (3.2 in)
2000	55.9 mm (2.2 in)
2001	75.7 mm (3.0 in)
2002	57.7 mm (2.3 in)
2003	38.9 mm (1.5 in)
2004	47.5 mm (1.9 in)
2005	58.9 mm (2.3 in)
2006	68.8 mm (2.7 in)
2007	68.3 mm (2.7 in)
2008	81.3 mm (3.2 in)
2009	65.8 mm (2.6 in)
2010	84.1 mm (3.3 in)
2011	51.6 mm (2.0 in)
2012	46.0 mm (1.8 in)
2013	45.0 mm (1.8 in)

Wettest five days (Rx5day)

The wettest five days of the year at Chontalcoatlan, 1976 to 2013. The record is 204.5 mm (8.1 in) in 1985, marked on the chart; the median year is 125.2 mm (4.9 in).

Wettest five days (Rx5day) at Chontalcoatlan by year
Year	Wettest five days (Rx5day)
1976	18.3 mm (0.7 in)
1977	124.7 mm (4.9 in)
1978	127.6 mm (5.0 in)
1979	76.2 mm (3.0 in)
1980	151.9 mm (6.0 in)
1981	200.5 mm (7.9 in)
1982	101.9 mm (4.0 in)
1983	98.9 mm (3.9 in)
1984	147.5 mm (5.8 in)
1985	204.5 mm (8.1 in)
1986	117.2 mm (4.6 in)
1987	106.4 mm (4.2 in)
1988	115.3 mm (4.5 in)
1989	0.0 mm (0.00 in)
1990	0.0 mm (0.00 in)
1991	24.6 mm (1.0 in)
1992	157.5 mm (6.2 in)
1993	152.6 mm (6.0 in)
1994	105.7 mm (4.2 in)
1995	146.6 mm (5.8 in)
1996	94.9 mm (3.7 in)
1997	113.0 mm (4.4 in)
1998	146.5 mm (5.8 in)
1999	167.6 mm (6.6 in)
2000	125.7 mm (4.9 in)
2001	100.8 mm (4.0 in)
2002	153.1 mm (6.0 in)
2003	142.7 mm (5.6 in)
2004	81.8 mm (3.2 in)
2005	131.0 mm (5.2 in)
2006	128.2 mm (5.0 in)
2007	124.3 mm (4.9 in)
2008	165.1 mm (6.5 in)
2009	141.5 mm (5.6 in)
2010	141.5 mm (5.6 in)
2011	120.1 mm (4.7 in)
2012	127.3 mm (5.0 in)
2013	113.9 mm (4.5 in)

Longest dry spell (CDD)

The longest dry spell of the year at Chontalcoatlan, 1976 to 2013. The record is 147 days in 1998, marked on the chart; the median year is 63 days.

Longest dry spell (CDD) at Chontalcoatlan by year
Year	Longest dry spell (CDD)
1976	29 days
1977	112 days
1978	43 days
1979	53 days
1980	69 days
1981	48 days
1982	62 days
1983	72 days
1984	64 days
1985	43 days
1986	57 days
1987	52 days
1988	82 days
1989	120 days
1990	31 days
1991	33 days
1992	86 days
1993	110 days
1994	106 days
1995	40 days
1996	123 days
1997	76 days
1998	147 days
1999	50 days
2000	117 days
2001	61 days
2002	49 days
2003	88 days
2004	59 days
2005	92 days
2006	84 days
2007	47 days
2008	76 days
2009	51 days
2010	58 days
2011	107 days
2012	57 days
2013	73 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, 1977 to 2012

A day with at least 59.2 mm (2.3 in) of rain is expected about once in 2 years. A day with at least 96.0 mm (3.8 in) of rain is expected about once in 100 years.

Rainfall return levels at Chontalcoatlan: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	59.2 mm (2.3 in)
5 years	70.4 mm (2.8 in)
10 years	77.3 mm (3.0 in)
25 years	85.3 mm (3.4 in)
50 years	90.8 mm (3.6 in)	Longer than the 31 years of record
100 years	96.0 mm (3.8 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 1977 to 2012.

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: 89.4 mm (3.5 in) in 1985; 84.1 mm (3.3 in) in 2010; 82.0 mm (3.2 in) in 1999.

Download the Data

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