Altepexi Weather Records (MXN00021010)

Record envelope, standing records and threshold days for Altepexi (MXN00021010), Mexico, with 44 years of record.

Key Facts for Altepexi

Altepexi (MXN00021010) is a weather station in Mexico at 18.37 latitude and -97.28 longitude, 1,582 m (5,190 ft) above sea level.
The station reports from 1954 to 1997, 44 years of record.
1,464 records set at Altepexi still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Altepexi set a daily record precipitation of 14.0 mm (0.6 in) on 3 October 1995.

About the Station

Location: Mexico, 18.37 latitude, -97.28 longitude.
Elevation: 1,582 m (5,190 ft).
Period of record: 1954 to 1997, 44 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 Altepexi. 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 Altepexi, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	35.6 C (96.1 F)	2.8 C (37.0 F)	n/a	n/a
Feb	38.9 C (102.0 F)	1.7 C (35.1 F)	n/a	n/a
Mar	41.7 C (107.1 F)	1.7 C (35.1 F)	n/a	n/a
Apr	43.9 C (111.0 F)	5.6 C (42.1 F)	n/a	n/a
May	45.0 C (113.0 F)	8.9 C (48.0 F)	n/a	n/a
Jun	40.0 C (104.0 F)	7.2 C (45.0 F)	n/a	n/a
Jul	38.9 C (102.0 F)	9.4 C (48.9 F)	n/a	n/a
Aug	37.8 C (100.0 F)	10.0 C (50.0 F)	n/a	n/a
Sep	38.3 C (100.9 F)	10.0 C (50.0 F)	n/a	n/a
Oct	37.8 C (100.0 F)	8.3 C (46.9 F)	n/a	n/a
Nov	35.0 C (95.0 F)	3.9 C (39.0 F)	n/a	n/a
Dec	35.6 C (96.1 F)	0.6 C (33.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Altepexi still stand. 1975 holds the most, with 130.

Standing records at Altepexi by the year they were set
Year set	Standing records
1969	66
1970	68
1971	59
1972	61
1973	86
1974	93
1975	130
1976	47
1977	60
1978	54
1979	56
1980	82
1981	53
1982	72
1983	66
1984	35
1987	77
1988	37
1989	36
1990	36
1991	35
1992	54
1993	29
1994	49
1995	13
1997	10

Wettest Day of Each Month

Sep: 87.9 mm (3.5 in)

The wettest day on record for each calendar month at Altepexi. The most was 87.9 mm (3.5 in) on 19 September 1960.

Record daily precipitation for each month at Altepexi
Month	Record daily precipitation (mm)	Date
Jan	24.9 mm (1.0 in)	31 January 1992
Feb	23.6 mm (0.9 in)	12 February 1983
Mar	24.9 mm (1.0 in)	26 March 1965
Apr	44.5 mm (1.8 in)	2 April 1968
May	79.8 mm (3.1 in)	6 May 1957
Jun	55.9 mm (2.2 in)	12 June 1972
Jul	55.9 mm (2.2 in)	15 July 1970
Aug	42.9 mm (1.7 in)	21 August 1969
Sep	87.9 mm (3.5 in)	19 September 1960
Oct	67.8 mm (2.7 in)	18 October 1966
Nov	20.3 mm (0.8 in)	8 November 1983
Dec	9.9 mm (0.39 in)	4 December 1965

Period of Record Coverage

1969 to 1997

26 years of record at Altepexi, 1969 to 1997. 7 years have data for under 90 percent of days and are left out of rankings: 1969, 1987, 1988, 1989, 1990, 1993, 1997.

Days with data per year at Altepexi
Year	Days with data	Share of year	Complete
1969	275	75%	No
1970	365	100%	Yes
1971	364	100%	Yes
1972	366	100%	Yes
1973	364	100%	Yes
1974	335	92%	Yes
1975	365	100%	Yes
1976	366	100%	Yes
1977	365	100%	Yes
1978	365	100%	Yes
1979	365	100%	Yes
1980	366	100%	Yes
1981	365	100%	Yes
1982	365	100%	Yes
1983	334	92%	Yes
1984	335	92%	Yes
1987	328	90%	No
1988	211	58%	No
1989	120	33%	No
1990	324	89%	No
1991	333	91%	Yes
1992	363	99%	Yes
1993	276	76%	No
1994	365	100%	Yes
1995	365	100%	Yes
1997	50	14%	No

Latest Records

Latest records at Altepexi
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
3 October 1995	Altepexi, MX	daily rain	14.0 mm (0.6 in)	4.1 mm (0.16 in)	36 years	18 of 100 (Routine)
12 August 1995	Altepexi, MX	daily rain	29.0 mm (1.1 in)	8.2 mm (0.32 in)	14 years	16 of 100 (Routine)
6 August 1995	Altepexi, MX	daily rain	27.9 mm (1.1 in)	15.5 mm (0.6 in)	24 years	27 of 100 (Routine)
11 July 1995	Altepexi, MX	daily rain	23.1 mm (0.9 in)	9.6 mm (0.38 in)	10 years	18 of 100 (Routine)
26 October 1994	Altepexi, MX	daily rain (Tie)	3.6 mm (0.14 in)	tie	3 years	1 of 100 (Routine)
21 September 1993	Altepexi, MX	daily rain	59.9 mm (2.4 in)	40.6 mm (1.6 in)	19 years	42 of 100 (Notable)
28 July 1993	Altepexi, MX	daily rain	12.4 mm (0.5 in)	12.1 mm (0.5 in)	38 years	20 of 100 (Routine)
28 June 1993	Altepexi, MX	daily rain	54.9 mm (2.2 in)	19.1 mm (0.8 in)	20 years	28 of 100 (Routine)
23 June 1993	Altepexi, MX	daily rain	37.3 mm (1.5 in)	7.3 mm (0.29 in)	31 years	20 of 100 (Routine)
19 June 1993	Altepexi, MX	daily rain	15.0 mm (0.6 in)	2.0 mm (0.08 in)	24 years	12 of 100 (Routine)
9 May 1993	Altepexi, MX	daily rain	11.4 mm (0.4 in)	8.9 mm (0.35 in)	6 years	11 of 100 (Routine)
29 April 1993	Altepexi, MX	daily rain	0.8 mm (0.03 in)	0.8 mm (0.03 in)	39 years	16 of 100 (Routine)
3 December 1992	Altepexi, MX	daily rain (Tie)	1.8 mm (0.07 in)	tie	9 years	1 of 100 (Routine)
2 December 1992	Altepexi, MX	daily rain	4.3 mm (0.17 in)	4.3 mm (0.17 in)	38 years	18 of 100 (Routine)
23 October 1992	Altepexi, MX	daily rain	1.8 mm (0.07 in)	0.5 mm (0.02 in)	21 years	9 of 100 (Routine)
12 September 1992	Altepexi, MX	daily rain	11.4 mm (0.4 in)	3.5 mm (0.14 in)	17 years	10 of 100 (Routine)
2 June 1992	Altepexi, MX	daily rain	13.5 mm (0.5 in)	5.6 mm (0.22 in)	20 years	14 of 100 (Routine)
1 June 1992	Altepexi, MX	daily rain	17.3 mm (0.7 in)	9.4 mm (0.37 in)	23 years	18 of 100 (Routine)
15 May 1992	Altepexi, MX	daily rain	10.9 mm (0.4 in)	2.0 mm (0.08 in)	1 year	4 of 100 (Routine)
13 May 1992	Altepexi, MX	daily rain	10.2 mm (0.4 in)	6.9 mm (0.27 in)	4 years	9 of 100 (Routine)

Climate Trend

15 complete years, 1970 to 1995

One stripe for each of 15 complete years at Altepexi, 1970 to 1995. Blue stripes are years cooler than the station's own mean of 22.5 C (72.6 F); red stripes are warmer. The coolest year was 1994, at 20.5 C (68.9 F), and the warmest was 1982, at 23.9 C (75.0 F). The strongest colour marks a difference of 2.1 C (3.8 F).

Annual mean temperature at Altepexi as warming stripes, 1970 to 1995
Year	Annual mean temperature	Difference from the station mean
1970	22.5 C	-0.01 C
1971	23.0 C	+0.41 C
1972	23.1 C	+0.55 C
1973	23.0 C	+0.48 C
1975	21.3 C	-1.22 C
1976	22.6 C	+0.09 C
1977	23.2 C	+0.61 C
1978	23.2 C	+0.61 C
1979	23.1 C	+0.51 C
1980	23.2 C	+0.65 C
1981	22.9 C	+0.36 C
1982	23.9 C	+1.32 C
1992	20.9 C	-1.69 C
1994	20.5 C	-2.03 C
1995	21.9 C	-0.65 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

1954 to 1997

Yearly extremes at Altepexi: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	45.0 C (113.0 F)	1974	40.3 C (104.5 F)	26
Coldest night (TNn)	0.6 C (33.1 F)	1989	5.0 C (41.0 F)	26
Wettest day (Rx1day)	87.9 mm (3.5 in)	1960	41.9 mm (1.6 in)	41
Wettest five days (Rx5day)	136.4 mm (5.4 in)	1955	75.7 mm (3.0 in)	41
Longest dry spell (CDD)	301 days	1954	87 days	41

Hottest day (TXx)

The hottest day of the year at Altepexi, 1954 to 1997. The record is 45.0 C (113.0 F) in 1974, marked on the chart; the median year is 40.3 C (104.5 F).

Hottest day (TXx) at Altepexi by year
Year	Hottest day (TXx)
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
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	40.0 C (104.0 F)
1970	40.6 C (105.1 F)
1971	41.7 C (107.1 F)
1972	40.0 C (104.0 F)
1973	41.7 C (107.1 F)
1974	45.0 C (113.0 F)
1975	39.4 C (102.9 F)
1976	37.8 C (100.0 F)
1977	40.0 C (104.0 F)
1978	41.7 C (107.1 F)
1979	42.8 C (109.0 F)
1980	42.2 C (108.0 F)
1981	41.1 C (106.0 F)
1982	41.1 C (106.0 F)
1983	42.2 C (108.0 F)
1984	42.2 C (108.0 F)
1987	41.1 C (106.0 F)
1988	42.2 C (108.0 F)
1989	33.9 C (93.0 F)
1990	38.9 C (102.0 F)
1991	40.0 C (104.0 F)
1992	36.7 C (98.1 F)
1993	38.9 C (102.0 F)
1994	36.7 C (98.1 F)
1995	38.9 C (102.0 F)
1997	30.6 C (87.1 F)

Coldest night (TNn)

The coldest night of the year at Altepexi, 1954 to 1997. The record is 0.6 C (33.1 F) in 1989, marked on the chart; the median year is 5.0 C (41.0 F).

Coldest night (TNn) at Altepexi by year
Year	Coldest night (TNn)
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
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	5.0 C (41.0 F)
1970	2.8 C (37.0 F)
1971	5.0 C (41.0 F)
1972	5.0 C (41.0 F)
1973	2.8 C (37.0 F)
1974	3.9 C (39.0 F)
1975	1.7 C (35.1 F)
1976	1.7 C (35.1 F)
1977	5.0 C (41.0 F)
1978	6.7 C (44.1 F)
1979	3.9 C (39.0 F)
1980	5.6 C (42.1 F)
1981	5.6 C (42.1 F)
1982	5.6 C (42.1 F)
1983	5.0 C (41.0 F)
1984	5.0 C (41.0 F)
1987	4.4 C (39.9 F)
1988	2.8 C (37.0 F)
1989	0.6 C (33.1 F)
1990	3.3 C (37.9 F)
1991	5.6 C (42.1 F)
1992	5.0 C (41.0 F)
1993	3.9 C (39.0 F)
1994	6.1 C (43.0 F)
1995	5.0 C (41.0 F)
1997	5.0 C (41.0 F)

Wettest day (Rx1day)

The wettest day of the year at Altepexi, 1954 to 1997. The record is 87.9 mm (3.5 in) in 1960, marked on the chart; the median year is 41.9 mm (1.6 in).

Wettest day (Rx1day) at Altepexi by year
Year	Wettest day (Rx1day)
1954	2.3 mm (0.09 in)
1955	59.9 mm (2.4 in)
1956	29.0 mm (1.1 in)
1957	79.8 mm (3.1 in)
1958	57.9 mm (2.3 in)
1959	46.0 mm (1.8 in)
1960	87.9 mm (3.5 in)
1961	46.0 mm (1.8 in)
1962	59.9 mm (2.4 in)
1963	34.8 mm (1.4 in)
1964	51.8 mm (2.0 in)
1965	24.9 mm (1.0 in)
1966	67.8 mm (2.7 in)
1967	41.9 mm (1.6 in)
1968	44.5 mm (1.8 in)
1969	42.9 mm (1.7 in)
1970	55.9 mm (2.2 in)
1971	35.8 mm (1.4 in)
1972	55.9 mm (2.2 in)
1973	39.9 mm (1.6 in)
1974	19.3 mm (0.8 in)
1975	50.8 mm (2.0 in)
1976	30.5 mm (1.2 in)
1977	50.8 mm (2.0 in)
1978	29.5 mm (1.2 in)
1979	27.4 mm (1.1 in)
1980	47.0 mm (1.9 in)
1981	34.5 mm (1.4 in)
1982	22.1 mm (0.9 in)
1983	42.4 mm (1.7 in)
1984	51.6 mm (2.0 in)
1987	34.8 mm (1.4 in)
1988	39.9 mm (1.6 in)
1989	10.2 mm (0.4 in)
1990	32.8 mm (1.3 in)
1991	42.4 mm (1.7 in)
1992	24.9 mm (1.0 in)
1993	59.9 mm (2.4 in)
1994	11.4 mm (0.4 in)
1995	37.8 mm (1.5 in)
1997	0.0 mm (0.00 in)

Wettest five days (Rx5day)

The wettest five days of the year at Altepexi, 1954 to 1997. The record is 136.4 mm (5.4 in) in 1955, marked on the chart; the median year is 75.7 mm (3.0 in).

Wettest five days (Rx5day) at Altepexi by year
Year	Wettest five days (Rx5day)
1954	4.4 mm (0.17 in)
1955	136.4 mm (5.4 in)
1956	93.0 mm (3.7 in)
1957	104.9 mm (4.1 in)
1958	128.3 mm (5.1 in)
1959	85.6 mm (3.4 in)
1960	87.9 mm (3.5 in)
1961	125.7 mm (4.9 in)
1962	113.7 mm (4.5 in)
1963	49.3 mm (1.9 in)
1964	94.5 mm (3.7 in)
1965	41.7 mm (1.6 in)
1966	79.8 mm (3.1 in)
1967	62.4 mm (2.5 in)
1968	82.7 mm (3.3 in)
1969	121.5 mm (4.8 in)
1970	81.8 mm (3.2 in)
1971	53.8 mm (2.1 in)
1972	65.3 mm (2.6 in)
1973	94.4 mm (3.7 in)
1974	57.9 mm (2.3 in)
1975	86.9 mm (3.4 in)
1976	69.1 mm (2.7 in)
1977	82.0 mm (3.2 in)
1978	71.7 mm (2.8 in)
1979	70.1 mm (2.8 in)
1980	95.5 mm (3.8 in)
1981	75.7 mm (3.0 in)
1982	47.5 mm (1.9 in)
1983	75.4 mm (3.0 in)
1984	125.1 mm (4.9 in)
1987	42.0 mm (1.7 in)
1988	46.7 mm (1.8 in)
1989	12.5 mm (0.5 in)
1990	36.6 mm (1.4 in)
1991	64.8 mm (2.6 in)
1992	85.4 mm (3.4 in)
1993	101.1 mm (4.0 in)
1994	27.9 mm (1.1 in)
1995	63.5 mm (2.5 in)
1997	0.0 mm (0.00 in)

Longest dry spell (CDD)

The longest dry spell of the year at Altepexi, 1954 to 1997. The record is 301 days in 1954, marked on the chart; the median year is 87 days.

Longest dry spell (CDD) at Altepexi by year
Year	Longest dry spell (CDD)
1954	301 days
1955	115 days
1956	77 days
1957	104 days
1958	85 days
1959	94 days
1960	128 days
1961	81 days
1962	101 days
1963	95 days
1964	61 days
1965	44 days
1966	70 days
1967	61 days
1968	78 days
1969	79 days
1970	133 days
1971	92 days
1972	111 days
1973	104 days
1974	151 days
1975	131 days
1976	115 days
1977	114 days
1978	83 days
1979	67 days
1980	60 days
1981	88 days
1982	83 days
1983	73 days
1984	87 days
1987	92 days
1988	98 days
1989	72 days
1990	70 days
1991	74 days
1992	39 days
1993	31 days
1994	181 days
1995	146 days
1997	59 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, 1954 to 1995

A day with at least 41.1 mm (1.6 in) of rain is expected about once in 2 years. A day with at least 84.6 mm (3.3 in) of rain is expected about once in 100 years.

Rainfall return levels at Altepexi: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	41.1 mm (1.6 in)
5 years	56.5 mm (2.2 in)
10 years	65.0 mm (2.6 in)
25 years	74.0 mm (2.9 in)
50 years	79.7 mm (3.1 in)	Longer than the 37 years of record
100 years	84.6 mm (3.3 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 1954 to 1995.

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: 87.9 mm (3.5 in) in 1960; 79.8 mm (3.1 in) in 1957; 67.8 mm (2.7 in) in 1966.

Download the Data

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