Zacualpan Weather Records (MXN00018043)

Record envelope, standing records and threshold days for Zacualpan (MXN00018043), Mexico, with 31 years of record.

Key Facts for Zacualpan

Zacualpan (MXN00018043) is a weather station in Mexico at 21.25 latitude and -105.17 longitude, 29 m (95 ft) above sea level.
The station reports from 1961 to 1991, 31 years of record.
1,464 records set at Zacualpan still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Mexico, 21.25 latitude, -105.17 longitude.
Elevation: 29 m (95 ft).
Period of record: 1961 to 1991, 31 years.
Eligible elements: none yet.

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 Zacualpan. 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 Zacualpan, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	36.7 C (98.1 F)	8.9 C (48.0 F)	n/a	n/a
Feb	36.7 C (98.1 F)	8.3 C (46.9 F)	n/a	n/a
Mar	37.8 C (100.0 F)	10.0 C (50.0 F)	n/a	n/a
Apr	36.7 C (98.1 F)	8.9 C (48.0 F)	n/a	n/a
May	36.7 C (98.1 F)	11.1 C (52.0 F)	n/a	n/a
Jun	38.9 C (102.0 F)	16.7 C (62.1 F)	n/a	n/a
Jul	41.7 C (107.1 F)	13.9 C (57.0 F)	n/a	n/a
Aug	42.8 C (109.0 F)	13.9 C (57.0 F)	n/a	n/a
Sep	38.9 C (102.0 F)	11.7 C (53.1 F)	n/a	n/a
Oct	40.0 C (104.0 F)	15.0 C (59.0 F)	n/a	n/a
Nov	38.9 C (102.0 F)	10.6 C (51.1 F)	n/a	n/a
Dec	37.2 C (99.0 F)	10.0 C (50.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Zacualpan still stand. 1977 holds the most, with 255.

Standing records at Zacualpan by the year they were set
Year set	Standing records
1971	58
1972	75
1973	116
1974	84
1975	45
1976	137
1977	255
1978	40
1979	31
1980	62
1981	49
1982	39
1983	104
1984	78
1985	29
1986	38
1987	64
1988	103
1989	24
1990	26
1991	7

Wettest Day of Each Month

Jun: 207.3 mm (8.2 in)

The wettest day on record for each calendar month at Zacualpan. The most was 207.3 mm (8.2 in) on 24 June 1962.

Record daily precipitation for each month at Zacualpan
Month	Record daily precipitation (mm)	Date
Jan	62.0 mm (2.4 in)	30 January 1984
Feb	53.3 mm (2.1 in)	11 February 1968
Mar	57.9 mm (2.3 in)	12 March 1983
Apr	18.8 mm (0.7 in)	2 April 1966
May	114.8 mm (4.5 in)	27 May 1983
Jun	207.3 mm (8.2 in)	24 June 1962
Jul	181.9 mm (7.2 in)	2 July 1973
Aug	144.8 mm (5.7 in)	4 August 1975
Sep	136.9 mm (5.4 in)	1 September 1971
Oct	176.8 mm (7.0 in)	22 October 1978
Nov	59.4 mm (2.3 in)	16 November 1976
Dec	68.3 mm (2.7 in)	28 December 1969

Period of Record Coverage

1971 to 1991

21 years of record at Zacualpan, 1971 to 1991. 6 years have data for under 90 percent of days and are left out of rankings: 1975, 1979, 1982, 1985, 1990, 1991.

Days with data per year at Zacualpan
Year	Days with data	Share of year	Complete
1971	334	92%	Yes
1972	366	100%	Yes
1973	364	100%	Yes
1974	365	100%	Yes
1975	304	83%	No
1976	366	100%	Yes
1977	365	100%	Yes
1978	334	92%	Yes
1979	92	25%	No
1980	335	92%	Yes
1981	365	100%	Yes
1982	243	67%	No
1983	365	100%	Yes
1984	334	91%	Yes
1985	213	58%	No
1986	335	92%	Yes
1987	363	99%	Yes
1988	366	100%	Yes
1989	365	100%	Yes
1990	151	41%	No
1991	59	16%	No

Latest Records

No records were set at this station in the latest data.

Climate Trend

10 complete years, 1972 to 1989

One stripe for each of 10 complete years at Zacualpan, 1972 to 1989. Blue stripes are years cooler than the station's own mean of 24.8 C (76.6 F); red stripes are warmer. The coolest year was 1988, at 23.6 C (74.4 F), and the warmest was 1976, at 25.5 C (78.0 F). The strongest colour marks a difference of 1.2 C (2.2 F).

Annual mean temperature at Zacualpan as warming stripes, 1972 to 1989
Year	Annual mean temperature	Difference from the station mean
1972	24.9 C	+0.19 C
1973	24.3 C	-0.49 C
1974	23.9 C	-0.85 C
1976	25.5 C	+0.78 C
1977	25.5 C	+0.75 C
1981	24.7 C	-0.03 C
1983	25.3 C	+0.52 C
1987	24.9 C	+0.19 C
1988	23.6 C	-1.20 C
1989	24.9 C	+0.14 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 1991

Yearly extremes at Zacualpan: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	42.8 C (109.0 F)	1984	37.8 C (100.0 F)	21
Coldest night (TNn)	8.3 C (46.9 F)	1974	10.0 C (50.0 F)	21
Wettest day (Rx1day)	207.3 mm (8.2 in)	1962	104.9 mm (4.1 in)	31
Wettest five days (Rx5day)	381.0 mm (15.0 in)	1973	194.1 mm (7.6 in)	31
Longest dry spell (CDD)	170 days	1964	106 days	31

Hottest day (TXx)

The hottest day of the year at Zacualpan, 1961 to 1991. The record is 42.8 C (109.0 F) in 1984, marked on the chart; the median year is 37.8 C (100.0 F).

Hottest day (TXx) at Zacualpan 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	36.1 C (97.0 F)
1972	37.8 C (100.0 F)
1973	38.3 C (100.9 F)
1974	36.1 C (97.0 F)
1975	38.9 C (102.0 F)
1976	38.9 C (102.0 F)
1977	38.3 C (100.9 F)
1978	37.8 C (100.0 F)
1979	40.0 C (104.0 F)
1980	37.8 C (100.0 F)
1981	37.8 C (100.0 F)
1982	35.6 C (96.1 F)
1983	38.9 C (102.0 F)
1984	42.8 C (109.0 F)
1985	35.6 C (96.1 F)
1986	37.8 C (100.0 F)
1987	36.7 C (98.1 F)
1988	36.7 C (98.1 F)
1989	37.8 C (100.0 F)
1990	35.0 C (95.0 F)
1991	35.0 C (95.0 F)

Coldest night (TNn)

The coldest night of the year at Zacualpan, 1961 to 1991. The record is 8.3 C (46.9 F) in 1974, marked on the chart; the median year is 10.0 C (50.0 F).

Coldest night (TNn) at Zacualpan 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	9.4 C (48.9 F)
1972	10.0 C (50.0 F)
1973	9.4 C (48.9 F)
1974	8.3 C (46.9 F)
1975	10.6 C (51.1 F)
1976	10.0 C (50.0 F)
1977	10.0 C (50.0 F)
1978	11.7 C (53.1 F)
1979	10.6 C (51.1 F)
1980	10.6 C (51.1 F)
1981	8.9 C (48.0 F)
1982	10.0 C (50.0 F)
1983	8.9 C (48.0 F)
1984	10.0 C (50.0 F)
1985	10.0 C (50.0 F)
1986	10.6 C (51.1 F)
1987	10.0 C (50.0 F)
1988	10.6 C (51.1 F)
1989	11.7 C (53.1 F)
1990	11.7 C (53.1 F)
1991	10.0 C (50.0 F)

Wettest day (Rx1day)

The wettest day of the year at Zacualpan, 1961 to 1991. The record is 207.3 mm (8.2 in) in 1962, marked on the chart; the median year is 104.9 mm (4.1 in).

Wettest day (Rx1day) at Zacualpan by year
Year	Wettest day (Rx1day)
1961	164.3 mm (6.5 in)
1962	207.3 mm (8.2 in)
1963	104.9 mm (4.1 in)
1964	120.4 mm (4.7 in)
1965	108.0 mm (4.3 in)
1966	91.4 mm (3.6 in)
1967	99.8 mm (3.9 in)
1968	108.0 mm (4.3 in)
1969	100.1 mm (3.9 in)
1970	55.1 mm (2.2 in)
1971	136.9 mm (5.4 in)
1972	120.9 mm (4.8 in)
1973	181.9 mm (7.2 in)
1974	92.5 mm (3.6 in)
1975	144.8 mm (5.7 in)
1976	185.9 mm (7.3 in)
1977	121.9 mm (4.8 in)
1978	176.8 mm (7.0 in)
1979	15.7 mm (0.6 in)
1980	96.3 mm (3.8 in)
1981	75.9 mm (3.0 in)
1982	62.0 mm (2.4 in)
1983	114.8 mm (4.5 in)
1984	62.0 mm (2.4 in)
1985	60.5 mm (2.4 in)
1986	91.9 mm (3.6 in)
1987	120.4 mm (4.7 in)
1988	109.0 mm (4.3 in)
1989	89.9 mm (3.5 in)
1990	54.9 mm (2.2 in)
1991	0.0 mm (0.00 in)

Wettest five days (Rx5day)

The wettest five days of the year at Zacualpan, 1961 to 1991. The record is 381.0 mm (15.0 in) in 1973, marked on the chart; the median year is 194.1 mm (7.6 in).

Wettest five days (Rx5day) at Zacualpan by year
Year	Wettest five days (Rx5day)
1961	275.1 mm (10.8 in)
1962	292.9 mm (11.5 in)
1963	233.3 mm (9.2 in)
1964	199.5 mm (7.9 in)
1965	194.1 mm (7.6 in)
1966	234.2 mm (9.2 in)
1967	181.0 mm (7.1 in)
1968	195.7 mm (7.7 in)
1969	243.8 mm (9.6 in)
1970	119.6 mm (4.7 in)
1971	318.8 mm (12.6 in)
1972	181.4 mm (7.1 in)
1973	381.0 mm (15.0 in)
1974	199.1 mm (7.8 in)
1975	187.5 mm (7.4 in)
1976	307.7 mm (12.1 in)
1977	176.3 mm (6.9 in)
1978	231.7 mm (9.1 in)
1979	18.8 mm (0.7 in)
1980	194.8 mm (7.7 in)
1981	161.3 mm (6.4 in)
1982	72.2 mm (2.8 in)
1983	209.3 mm (8.2 in)
1984	172.2 mm (6.8 in)
1985	128.4 mm (5.1 in)
1986	176.6 mm (7.0 in)
1987	179.7 mm (7.1 in)
1988	356.6 mm (14.0 in)
1989	175.2 mm (6.9 in)
1990	54.9 mm (2.2 in)
1991	0.0 mm (0.00 in)

Longest dry spell (CDD)

The longest dry spell of the year at Zacualpan, 1961 to 1991. The record is 170 days in 1964, marked on the chart; the median year is 106 days.

Longest dry spell (CDD) at Zacualpan by year
Year	Longest dry spell (CDD)
1961	24 days
1962	138 days
1963	162 days
1964	170 days
1965	149 days
1966	75 days
1967	109 days
1968	86 days
1969	106 days
1970	96 days
1971	158 days
1972	154 days
1973	96 days
1974	146 days
1975	133 days
1976	152 days
1977	80 days
1978	112 days
1979	33 days
1980	99 days
1981	68 days
1982	63 days
1983	73 days
1984	118 days
1985	74 days
1986	56 days
1987	82 days
1988	106 days
1989	169 days
1990	125 days
1991	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.

Download the Data

Data for Zacualpan standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Zacualpan 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 2026-10-14 (14 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).