Tlalchapa Weather Records (MXN00012090)

Record envelope, standing records and threshold days for Tlalchapa (MXN00012090), Mexico, with 47 years of record.

Key Facts for Tlalchapa

Tlalchapa (MXN00012090) is a weather station in Mexico at 18.42 latitude and -100.47 longitude, 400 m (1,312 ft) above sea level.
The station reports from 1966 to 2012, 47 years of record.
1,464 records set at Tlalchapa still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Tlalchapa tied a monthly record high minimum temperature of 25.0 C (77.0 F) on 24 October 2012.

About the Station

Location: Mexico, 18.42 latitude, -100.47 longitude.
Elevation: 400 m (1,312 ft).
Period of record: 1966 to 2012, 47 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 Tlalchapa. 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 Tlalchapa, 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)	6.7 C (44.1 F)	n/a	n/a
Feb	42.8 C (109.0 F)	9.4 C (48.9 F)	n/a	n/a
Mar	45.0 C (113.0 F)	10.6 C (51.1 F)	n/a	n/a
Apr	45.6 C (114.1 F)	15.0 C (59.0 F)	n/a	n/a
May	45.6 C (114.1 F)	15.0 C (59.0 F)	n/a	n/a
Jun	45.6 C (114.1 F)	16.1 C (61.0 F)	n/a	n/a
Jul	38.9 C (102.0 F)	13.9 C (57.0 F)	n/a	n/a
Aug	36.7 C (98.1 F)	16.7 C (62.1 F)	n/a	n/a
Sep	37.8 C (100.0 F)	16.7 C (62.1 F)	n/a	n/a
Oct	40.6 C (105.1 F)	13.9 C (57.0 F)	n/a	n/a
Nov	40.6 C (105.1 F)	8.9 C (48.0 F)	n/a	n/a
Dec	40.0 C (104.0 F)	7.8 C (46.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Tlalchapa still stand. 1979 holds the most, with 147.

Standing records at Tlalchapa by the year they were set
Year set	Standing records
1975	21
1976	141
1977	18
1978	23
1979	147
1980	37
1981	48
1982	24
1983	28
1984	33
1985	22
1986	31
1987	13
1988	8
1989	17
1990	46
1991	33
1992	58
1993	11
1994	42
1995	66
1996	24
1997	44
1998	78
1999	37
2000	31
2001	16
2002	19
2003	38
2004	17
2005	47
2006	26
2007	37
2008	12
2009	13
2010	55
2011	64
2012	39

All-Time Record Progression

1 new records

1 all-time records were set at Tlalchapa between 11 June 1997 and 11 June 1997. Each dot is a new record.

Wettest Day of Each Month

Jun: 99.8 mm (3.9 in)

The wettest day on record for each calendar month at Tlalchapa. The most was 99.8 mm (3.9 in) on 11 June 1997.

Record daily precipitation for each month at Tlalchapa
Month	Record daily precipitation (mm)	Date
Jan	59.9 mm (2.4 in)	25 January 1980
Feb	81.8 mm (3.2 in)	3 February 2010
Mar	24.9 mm (1.0 in)	2 March 2001
Apr	24.9 mm (1.0 in)	18 April 1999
May	52.3 mm (2.1 in)	30 May 1996
Jun	99.8 mm (3.9 in)	11 June 1997
Jul	87.1 mm (3.4 in)	11 July 1984
Aug	79.2 mm (3.1 in)	22 August 1977
Sep	94.0 mm (3.7 in)	10 September 1998
Oct	55.4 mm (2.2 in)	3 October 1990
Nov	39.9 mm (1.6 in)	1 November 2003
Dec	43.9 mm (1.7 in)	2 December 1986

Period of Record Coverage

1975 to 2012

38 years of record at Tlalchapa, 1975 to 2012. 5 years have data for under 90 percent of days and are left out of rankings: 1975, 1994, 1997, 2011, 2012.

Days with data per year at Tlalchapa
Year	Days with data	Share of year	Complete
1975	135	37%	No
1976	358	98%	Yes
1977	365	100%	Yes
1978	365	100%	Yes
1979	365	100%	Yes
1980	366	100%	Yes
1981	359	98%	Yes
1982	365	100%	Yes
1983	364	100%	Yes
1984	366	100%	Yes
1985	365	100%	Yes
1986	364	100%	Yes
1987	365	100%	Yes
1988	366	100%	Yes
1989	365	100%	Yes
1990	364	100%	Yes
1991	365	100%	Yes
1992	366	100%	Yes
1993	365	100%	Yes
1994	245	67%	No
1995	365	100%	Yes
1996	366	100%	Yes
1997	212	58%	No
1998	365	100%	Yes
1999	365	100%	Yes
2000	366	100%	Yes
2001	365	100%	Yes
2002	365	100%	Yes
2003	365	100%	Yes
2004	366	100%	Yes
2005	365	100%	Yes
2006	365	100%	Yes
2007	365	100%	Yes
2008	366	100%	Yes
2009	365	100%	Yes
2010	334	92%	Yes
2011	183	50%	No
2012	305	83%	No

Latest Records

Latest records at Tlalchapa
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
24 October 2012	Tlalchapa, MX	monthly high min (Tie)	25.0 C (77.0 F)	tie	8 years	3 of 100 (Routine)
23 October 2012	Tlalchapa, MX	daily high min (Tie)	23.9 C (75.0 F)	tie	8 years	1 of 100 (Routine)
22 October 2012	Tlalchapa, MX	daily high min (Tie)	23.9 C (75.0 F)	tie	18 years	2 of 100 (Routine)
20 October 2012	Tlalchapa, MX	monthly high min (Tie)	25.0 C (77.0 F)	tie	8 years	3 of 100 (Routine)
19 October 2012	Tlalchapa, MX	daily high min (Tie)	23.9 C (75.0 F)	tie	8 years	1 of 100 (Routine)
18 October 2012	Tlalchapa, MX	daily high max (Tie)	37.8 C (100.0 F)	tie	1 year	0 of 100 (Routine)
15 October 2012	Tlalchapa, MX	daily high min	24.4 C (75.9 F)	0.5 C (0.9 F)	7 years	7 of 100 (Routine)
14 October 2012	Tlalchapa, MX	daily high min (Tie)	23.9 C (75.0 F)	tie	8 years	1 of 100 (Routine)
14 October 2012	Tlalchapa, MX	daily high max (Tie)	37.8 C (100.0 F)	tie	2 years	0 of 100 (Routine)
7 October 2012	Tlalchapa, MX	daily high max	36.7 C (98.1 F)	1.1 C (2.0 F)	12 years	10 of 100 (Routine)
6 October 2012	Tlalchapa, MX	daily high max (Tie)	36.7 C (98.1 F)	tie	1 year	0 of 100 (Routine)
29 September 2012	Tlalchapa, MX	daily high min	23.9 C (75.0 F)	0.6 C (1.1 F)	7 years	9 of 100 (Routine)
23 September 2012	Tlalchapa, MX	daily high min (Tie)	23.9 C (75.0 F)	tie	7 years	1 of 100 (Routine)
4 September 2012	Tlalchapa, MX	daily high max	37.2 C (99.0 F)	1.6 C (2.9 F)	18 years	15 of 100 (Routine)
3 September 2012	Tlalchapa, MX	daily high max	35.6 C (96.1 F)	0.6 C (1.1 F)	12 years	8 of 100 (Routine)
3 September 2012	Tlalchapa, MX	daily high min (Tie)	24.4 C (75.9 F)	tie	2 years	0 of 100 (Routine)
29 August 2012	Tlalchapa, MX	monthly high min (Tie)	25.0 C (77.0 F)	tie	8 years	3 of 100 (Routine)
29 August 2012	Tlalchapa, MX	daily high max (Tie)	35.6 C (96.1 F)	tie	18 years	2 of 100 (Routine)
22 August 2012	Tlalchapa, MX	daily high min (Tie)	23.9 C (75.0 F)	tie	9 years	1 of 100 (Routine)
16 August 2012	Tlalchapa, MX	daily high max (Tie)	35.0 C (95.0 F)	tie	10 years	1 of 100 (Routine)

Climate Trend

32 complete years, 1976 to 2009

One stripe for each of 32 complete years at Tlalchapa, 1976 to 2009. Blue stripes are years cooler than the station's own mean of 27.4 C (81.3 F); red stripes are warmer. The coolest year was 1992, at 25.8 C (78.5 F), and the warmest was 2005, at 29.0 C (84.1 F). The strongest colour marks a difference of 1.6 C (2.9 F).

Annual mean temperature at Tlalchapa as warming stripes, 1976 to 2009
Year	Annual mean temperature	Difference from the station mean
1976	25.8 C	-1.54 C
1977	26.9 C	-0.52 C
1978	26.9 C	-0.49 C
1979	28.0 C	+0.65 C
1980	26.7 C	-0.69 C
1981	27.4 C	-0.02 C
1982	27.4 C	+0.07 C
1983	26.8 C	-0.57 C
1984	26.7 C	-0.70 C
1985	26.9 C	-0.43 C
1986	26.9 C	-0.51 C
1987	27.9 C	+0.56 C
1988	27.1 C	-0.31 C
1989	26.5 C	-0.86 C
1990	26.6 C	-0.76 C
1991	26.7 C	-0.63 C
1992	25.8 C	-1.55 C
1993	26.6 C	-0.75 C
1995	28.7 C	+1.31 C
1996	27.4 C	-0.02 C
1998	28.1 C	+0.73 C
1999	27.5 C	+0.15 C
2000	27.8 C	+0.46 C
2001	27.3 C	-0.07 C
2002	27.5 C	+0.12 C
2003	27.5 C	+0.17 C
2004	28.0 C	+0.66 C
2005	29.0 C	+1.59 C
2006	28.4 C	+0.99 C
2007	28.7 C	+1.32 C
2008	27.9 C	+0.57 C
2009	28.5 C	+1.16 C

The annual mean temperature here has risen by 0.5 C (0.3 to 0.7) per decade over 1976 to 2009. In Fahrenheit: 0.9 F (0.5 to 1.3) per decade. The slope is a straight line fitted to 32 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Tlalchapa
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.5 C (0.3 to 0.7) per decade	0.9 F (0.5 to 1.3) per decade	1976 to 2009	32	Rise
Mean daily maximum	0.9 C (0.5 to 1.3) per decade	1.6 F (1.0 to 2.3) per decade	1976 to 2009	32	Rise
Mean daily minimum	0.1 C (-0.2 to 0.4) per decade	0.2 F (-0.3 to 0.7) per decade	1976 to 2009	32	Not clearly different from zero

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

1966 to 2012

Yearly extremes at Tlalchapa: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	45.6 C (114.1 F)	1979	42.8 C (109.0 F)	38
Coldest night (TNn)	6.7 C (44.1 F)	1986	10.6 C (51.1 F)	38
Wettest day (Rx1day)	99.8 mm (3.9 in)	1997	67.8 mm (2.7 in)	47
Wettest five days (Rx5day)	201.8 mm (7.9 in)	1990	128.8 mm (5.1 in)	47
Longest dry spell (CDD)	163 days	1993	108 days	47

Hottest day (TXx)

The hottest day of the year at Tlalchapa, 1966 to 2012. The record is 45.6 C (114.1 F) in 1979, marked on the chart; the median year is 42.8 C (109.0 F).

Hottest day (TXx) at Tlalchapa by year
Year	Hottest day (TXx)
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	36.1 C (97.0 F)
1976	36.7 C (98.1 F)
1977	41.1 C (106.0 F)
1978	40.6 C (105.1 F)
1979	45.6 C (114.1 F)
1980	39.4 C (102.9 F)
1981	41.7 C (107.1 F)
1982	43.9 C (111.0 F)
1983	41.7 C (107.1 F)
1984	41.7 C (107.1 F)
1985	41.7 C (107.1 F)
1986	43.3 C (109.9 F)
1987	44.4 C (111.9 F)
1988	41.7 C (107.1 F)
1989	42.8 C (109.0 F)
1990	43.3 C (109.9 F)
1991	42.8 C (109.0 F)
1992	40.6 C (105.1 F)
1993	41.7 C (107.1 F)
1994	40.0 C (104.0 F)
1995	42.8 C (109.0 F)
1996	43.9 C (111.0 F)
1997	45.0 C (113.0 F)
1998	45.0 C (113.0 F)
1999	45.0 C (113.0 F)
2000	43.9 C (111.0 F)
2001	41.7 C (107.1 F)
2002	42.8 C (109.0 F)
2003	43.3 C (109.9 F)
2004	41.7 C (107.1 F)
2005	42.8 C (109.0 F)
2006	42.8 C (109.0 F)
2007	43.9 C (111.0 F)
2008	41.7 C (107.1 F)
2009	41.1 C (106.0 F)
2010	42.8 C (109.0 F)
2011	40.0 C (104.0 F)
2012	42.8 C (109.0 F)

Coldest night (TNn)

The coldest night of the year at Tlalchapa, 1966 to 2012. The record is 6.7 C (44.1 F) in 1986, marked on the chart; the median year is 10.6 C (51.1 F).

Coldest night (TNn) at Tlalchapa by year
Year	Coldest night (TNn)
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	10.0 C (50.0 F)
1976	9.4 C (48.9 F)
1977	10.6 C (51.1 F)
1978	10.0 C (50.0 F)
1979	11.7 C (53.1 F)
1980	11.7 C (53.1 F)
1981	11.7 C (53.1 F)
1982	10.0 C (50.0 F)
1983	10.6 C (51.1 F)
1984	10.6 C (51.1 F)
1985	11.7 C (53.1 F)
1986	6.7 C (44.1 F)
1987	12.2 C (54.0 F)
1988	12.8 C (55.0 F)
1989	12.8 C (55.0 F)
1990	12.8 C (55.0 F)
1991	9.4 C (48.9 F)
1992	10.0 C (50.0 F)
1993	10.6 C (51.1 F)
1994	16.1 C (61.0 F)
1995	12.8 C (55.0 F)
1996	11.1 C (52.0 F)
1997	10.6 C (51.1 F)
1998	7.2 C (45.0 F)
1999	7.8 C (46.0 F)
2000	10.0 C (50.0 F)
2001	11.7 C (53.1 F)
2002	8.9 C (48.0 F)
2003	10.0 C (50.0 F)
2004	10.0 C (50.0 F)
2005	10.6 C (51.1 F)
2006	10.6 C (51.1 F)
2007	11.7 C (53.1 F)
2008	10.6 C (51.1 F)
2009	9.4 C (48.9 F)
2010	8.9 C (48.0 F)
2011	8.9 C (48.0 F)
2012	10.0 C (50.0 F)

Wettest day (Rx1day)

The wettest day of the year at Tlalchapa, 1966 to 2012. The record is 99.8 mm (3.9 in) in 1997, marked on the chart; the median year is 67.8 mm (2.7 in).

Wettest day (Rx1day) at Tlalchapa by year
Year	Wettest day (Rx1day)
1966	41.9 mm (1.6 in)
1967	77.0 mm (3.0 in)
1968	67.8 mm (2.7 in)
1969	84.8 mm (3.3 in)
1970	71.9 mm (2.8 in)
1971	61.0 mm (2.4 in)
1972	59.9 mm (2.4 in)
1973	77.0 mm (3.0 in)
1974	65.8 mm (2.6 in)
1975	74.9 mm (2.9 in)
1976	69.9 mm (2.8 in)
1977	79.2 mm (3.1 in)
1978	56.9 mm (2.2 in)
1979	56.9 mm (2.2 in)
1980	59.9 mm (2.4 in)
1981	49.8 mm (2.0 in)
1982	53.8 mm (2.1 in)
1983	88.4 mm (3.5 in)
1984	87.1 mm (3.4 in)
1985	86.9 mm (3.4 in)
1986	56.4 mm (2.2 in)
1987	48.3 mm (1.9 in)
1988	49.8 mm (2.0 in)
1989	64.8 mm (2.6 in)
1990	70.9 mm (2.8 in)
1991	69.9 mm (2.8 in)
1992	61.0 mm (2.4 in)
1993	52.3 mm (2.1 in)
1994	59.4 mm (2.3 in)
1995	71.4 mm (2.8 in)
1996	74.4 mm (2.9 in)
1997	99.8 mm (3.9 in)
1998	94.0 mm (3.7 in)
1999	89.9 mm (3.5 in)
2000	59.9 mm (2.4 in)
2001	73.9 mm (2.9 in)
2002	82.8 mm (3.3 in)
2003	72.9 mm (2.9 in)
2004	62.5 mm (2.5 in)
2005	64.3 mm (2.5 in)
2006	54.4 mm (2.1 in)
2007	61.5 mm (2.4 in)
2008	62.5 mm (2.5 in)
2009	89.9 mm (3.5 in)
2010	81.8 mm (3.2 in)
2011	67.8 mm (2.7 in)
2012	33.8 mm (1.3 in)

Wettest five days (Rx5day)

The wettest five days of the year at Tlalchapa, 1966 to 2012. The record is 201.8 mm (7.9 in) in 1990, marked on the chart; the median year is 128.8 mm (5.1 in).

Wettest five days (Rx5day) at Tlalchapa by year
Year	Wettest five days (Rx5day)
1966	163.3 mm (6.4 in)
1967	145.4 mm (5.7 in)
1968	126.7 mm (5.0 in)
1969	137.7 mm (5.4 in)
1970	116.8 mm (4.6 in)
1971	123.2 mm (4.9 in)
1972	155.5 mm (6.1 in)
1973	128.8 mm (5.1 in)
1974	89.4 mm (3.5 in)
1975	104.4 mm (4.1 in)
1976	156.0 mm (6.1 in)
1977	100.1 mm (3.9 in)
1978	164.9 mm (6.5 in)
1979	92.5 mm (3.6 in)
1980	146.3 mm (5.8 in)
1981	166.9 mm (6.6 in)
1982	115.3 mm (4.5 in)
1983	144.3 mm (5.7 in)
1984	176.5 mm (6.9 in)
1985	159.6 mm (6.3 in)
1986	138.7 mm (5.5 in)
1987	113.4 mm (4.5 in)
1988	121.0 mm (4.8 in)
1989	108.2 mm (4.3 in)
1990	201.8 mm (7.9 in)
1991	145.6 mm (5.7 in)
1992	122.6 mm (4.8 in)
1993	111.1 mm (4.4 in)
1994	93.5 mm (3.7 in)
1995	106.0 mm (4.2 in)
1996	116.6 mm (4.6 in)
1997	107.7 mm (4.2 in)
1998	178.1 mm (7.0 in)
1999	123.2 mm (4.9 in)
2000	97.8 mm (3.9 in)
2001	170.9 mm (6.7 in)
2002	178.9 mm (7.0 in)
2003	140.7 mm (5.5 in)
2004	135.5 mm (5.3 in)
2005	128.6 mm (5.1 in)
2006	97.9 mm (3.9 in)
2007	143.6 mm (5.7 in)
2008	133.9 mm (5.3 in)
2009	153.4 mm (6.0 in)
2010	101.2 mm (4.0 in)
2011	165.6 mm (6.5 in)
2012	80.7 mm (3.2 in)

Longest dry spell (CDD)

The longest dry spell of the year at Tlalchapa, 1966 to 2012. The record is 163 days in 1993, marked on the chart; the median year is 108 days.

Longest dry spell (CDD) at Tlalchapa by year
Year	Longest dry spell (CDD)
1966	90 days
1967	94 days
1968	50 days
1969	140 days
1970	158 days
1971	146 days
1972	152 days
1973	102 days
1974	98 days
1975	108 days
1976	155 days
1977	98 days
1978	86 days
1979	65 days
1980	129 days
1981	66 days
1982	75 days
1983	71 days
1984	130 days
1985	124 days
1986	112 days
1987	93 days
1988	95 days
1989	152 days
1990	114 days
1991	158 days
1992	100 days
1993	163 days
1994	66 days
1995	104 days
1996	135 days
1997	55 days
1998	159 days
1999	107 days
2000	141 days
2001	72 days
2002	97 days
2003	141 days
2004	66 days
2005	145 days
2006	119 days
2007	105 days
2008	159 days
2009	110 days
2010	109 days
2011	148 days
2012	93 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

43 years, 1967 to 2011

A day with at least 68.0 mm (2.7 in) of rain is expected about once in 2 years. A day with at least 101.9 mm (4.0 in) of rain is expected about once in 100 years.

Rainfall return levels at Tlalchapa: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	68.0 mm (2.7 in)
5 years	79.5 mm (3.1 in)
10 years	86.0 mm (3.4 in)
25 years	93.1 mm (3.7 in)
50 years	97.8 mm (3.9 in)	Longer than the 43 years of record
100 years	101.9 mm (4.0 in)	Longer than the 43 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, 43 years of values from 1967 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: 94.0 mm (3.7 in) in 1998; 89.9 mm (3.5 in) in 1999; 89.9 mm (3.5 in) in 2009.

Download the Data

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