Zacatepec (Obs) Weather Records (MXN00017042)

Record envelope, standing records and threshold days for Zacatepec (Obs) (MXN00017042), Mexico, with 47 years of record.

Key Facts for Zacatepec (Obs)

Zacatepec (Obs) (MXN00017042) is a weather station in Mexico at 18.65 latitude and -99.18 longitude, 918 m (3,011 ft) above sea level.
The station reports from 1944 to 1990, 47 years of record.
1,464 records set at Zacatepec (Obs) still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Mexico, 18.65 latitude, -99.18 longitude.
Elevation: 918 m (3,011 ft).
Period of record: 1944 to 1990, 47 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 Zacatepec (Obs). 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 Zacatepec (Obs), with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	38.9 C (102.0 F)	1.1 C (34.0 F)	n/a	n/a
Feb	37.8 C (100.0 F)	0.0 C (32.0 F)	n/a	n/a
Mar	40.6 C (105.1 F)	2.8 C (37.0 F)	n/a	n/a
Apr	41.7 C (107.1 F)	5.6 C (42.1 F)	n/a	n/a
May	40.6 C (105.1 F)	8.9 C (48.0 F)	n/a	n/a
Jun	41.7 C (107.1 F)	11.7 C (53.1 F)	n/a	n/a
Jul	40.0 C (104.0 F)	7.8 C (46.0 F)	n/a	n/a
Aug	40.0 C (104.0 F)	7.8 C (46.0 F)	n/a	n/a
Sep	37.2 C (99.0 F)	6.7 C (44.1 F)	n/a	n/a
Oct	35.6 C (96.1 F)	5.0 C (41.0 F)	n/a	n/a
Nov	37.8 C (100.0 F)	2.8 C (37.0 F)	n/a	n/a
Dec	36.7 C (98.1 F)	1.7 C (35.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Zacatepec (Obs) still stand. 1950 holds the most, with 225.

Standing records at Zacatepec (Obs) by the year they were set
Year set	Standing records
1944	107
1945	158
1946	87
1947	81
1948	53
1949	147
1950	225
1951	49
1952	65
1958	82
1959	81
1960	48
1975	1
1977	17
1984	48
1985	20
1986	39
1987	50
1988	41
1989	46
1990	19

Wettest Day of Each Month

Nov: 86.9 mm (3.4 in)

The wettest day on record for each calendar month at Zacatepec (Obs). The most was 86.9 mm (3.4 in) on 4 November 1958.

Record daily precipitation for each month at Zacatepec (Obs)
Month	Record daily precipitation (mm)	Date
Jan	25.4 mm (1.0 in)	19 January 1958
Feb	2.8 mm (0.11 in)	22 February 1958
Mar	15.7 mm (0.6 in)	4 March 1988
Apr	19.3 mm (0.8 in)	12 April 1948
May	41.9 mm (1.6 in)	21 May 1947
Jun	74.2 mm (2.9 in)	1 June 1986
Jul	69.9 mm (2.8 in)	19 July 1988
Aug	71.9 mm (2.8 in)	10 August 1952
Sep	63.0 mm (2.5 in)	3 September 1958
Oct	65.8 mm (2.6 in)	7 October 1948
Nov	86.9 mm (3.4 in)	4 November 1958
Dec	9.4 mm (0.37 in)	11 December 1958

Period of Record Coverage

1944 to 1990

21 years of record at Zacatepec (Obs), 1944 to 1990. 6 years have data for under 90 percent of days and are left out of rankings: 1948, 1949, 1950, 1975, 1977, 1990.

Days with data per year at Zacatepec (Obs)
Year	Days with data	Share of year	Complete
1944	362	99%	Yes
1945	365	100%	Yes
1946	365	100%	Yes
1947	365	100%	Yes
1948	294	80%	No
1949	200	55%	No
1950	260	71%	No
1951	364	100%	Yes
1952	366	100%	Yes
1958	363	99%	Yes
1959	365	100%	Yes
1960	335	92%	Yes
1975	84	23%	No
1977	92	25%	No
1984	365	100%	Yes
1985	365	100%	Yes
1986	365	100%	Yes
1987	365	100%	Yes
1988	364	99%	Yes
1989	364	100%	Yes
1990	304	83%	No

Latest Records

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

Climate Trend

14 complete years, 1944 to 1989

One stripe for each of 14 complete years at Zacatepec (Obs), 1944 to 1989. Blue stripes are years cooler than the station's own mean of 24.1 C (75.5 F); red stripes are warmer. The coolest year was 1984, at 23.2 C (73.7 F), and the warmest was 1945, at 25.4 C (77.8 F). The strongest colour marks a difference of 1.3 C (2.3 F).

Annual mean temperature at Zacatepec (Obs) as warming stripes, 1944 to 1989
Year	Annual mean temperature	Difference from the station mean
1944	24.0 C	-0.16 C
1945	25.4 C	+1.29 C
1946	24.9 C	+0.79 C
1947	24.8 C	+0.61 C
1951	23.5 C	-0.63 C
1952	23.6 C	-0.55 C
1958	24.5 C	+0.35 C
1959	25.2 C	+1.08 C
1984	23.2 C	-0.97 C
1985	23.6 C	-0.51 C
1986	23.2 C	-0.96 C
1987	23.5 C	-0.65 C
1988	24.6 C	+0.42 C
1989	24.1 C	-0.08 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

1944 to 1990

Yearly extremes at Zacatepec (Obs): the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	41.7 C (107.1 F)	1944	40.0 C (104.0 F)	21
Coldest night (TNn)	0.0 C (32.0 F)	1944	4.4 C (39.9 F)	21
Wettest day (Rx1day)	86.9 mm (3.4 in)	1958	53.1 mm (2.1 in)	21
Wettest five days (Rx5day)	209.6 mm (8.3 in)	1958	99.5 mm (3.9 in)	21
Longest dry spell (CDD)	118 days	1986	71 days	21

Hottest day (TXx)

The hottest day of the year at Zacatepec (Obs), 1944 to 1990. The record is 41.7 C (107.1 F) in 1944, marked on the chart; the median year is 40.0 C (104.0 F).

Hottest day (TXx) at Zacatepec (Obs) by year
Year	Hottest day (TXx)
1944	41.7 C (107.1 F)
1945	40.0 C (104.0 F)
1946	40.0 C (104.0 F)
1947	39.4 C (102.9 F)
1948	40.6 C (105.1 F)
1949	36.7 C (98.1 F)
1950	35.0 C (95.0 F)
1951	41.7 C (107.1 F)
1952	38.9 C (102.0 F)
1958	40.0 C (104.0 F)
1959	40.0 C (104.0 F)
1960	40.6 C (105.1 F)
1975	38.3 C (100.9 F)
1977	38.3 C (100.9 F)
1984	38.9 C (102.0 F)
1985	38.9 C (102.0 F)
1986	40.0 C (104.0 F)
1987	40.0 C (104.0 F)
1988	40.0 C (104.0 F)
1989	40.0 C (104.0 F)
1990	38.9 C (102.0 F)

Coldest night (TNn)

The coldest night of the year at Zacatepec (Obs), 1944 to 1990. The record is 0.0 C (32.0 F) in 1944, marked on the chart; the median year is 4.4 C (39.9 F).

Coldest night (TNn) at Zacatepec (Obs) by year
Year	Coldest night (TNn)
1944	0.0 C (32.0 F)
1945	6.7 C (44.1 F)
1946	7.2 C (45.0 F)
1947	8.9 C (48.0 F)
1948	7.2 C (45.0 F)
1949	2.8 C (37.0 F)
1950	0.0 C (32.0 F)
1951	1.7 C (35.1 F)
1952	4.4 C (39.9 F)
1958	5.0 C (41.0 F)
1959	6.7 C (44.1 F)
1960	6.7 C (44.1 F)
1975	7.2 C (45.0 F)
1977	4.4 C (39.9 F)
1984	3.9 C (39.0 F)
1985	5.6 C (42.1 F)
1986	1.1 C (34.0 F)
1987	1.7 C (35.1 F)
1988	2.8 C (37.0 F)
1989	1.7 C (35.1 F)
1990	5.6 C (42.1 F)

Wettest day (Rx1day)

The wettest day of the year at Zacatepec (Obs), 1944 to 1990. The record is 86.9 mm (3.4 in) in 1958, marked on the chart; the median year is 53.1 mm (2.1 in).

Wettest day (Rx1day) at Zacatepec (Obs) by year
Year	Wettest day (Rx1day)
1944	32.3 mm (1.3 in)
1945	61.5 mm (2.4 in)
1946	41.9 mm (1.6 in)
1947	49.8 mm (2.0 in)
1948	65.8 mm (2.6 in)
1949	43.4 mm (1.7 in)
1950	48.8 mm (1.9 in)
1951	63.8 mm (2.5 in)
1952	71.9 mm (2.8 in)
1958	86.9 mm (3.4 in)
1959	63.8 mm (2.5 in)
1960	53.1 mm (2.1 in)
1975	4.3 mm (0.17 in)
1977	0.5 mm (0.02 in)
1984	64.5 mm (2.5 in)
1985	67.3 mm (2.6 in)
1986	74.2 mm (2.9 in)
1987	51.1 mm (2.0 in)
1988	69.9 mm (2.8 in)
1989	50.3 mm (2.0 in)
1990	44.2 mm (1.7 in)

Wettest five days (Rx5day)

The wettest five days of the year at Zacatepec (Obs), 1944 to 1990. The record is 209.6 mm (8.3 in) in 1958, marked on the chart; the median year is 99.5 mm (3.9 in).

Wettest five days (Rx5day) at Zacatepec (Obs) by year
Year	Wettest five days (Rx5day)
1944	56.2 mm (2.2 in)
1945	113.0 mm (4.4 in)
1946	81.8 mm (3.2 in)
1947	110.0 mm (4.3 in)
1948	87.4 mm (3.4 in)
1949	85.3 mm (3.4 in)
1950	88.9 mm (3.5 in)
1951	105.5 mm (4.2 in)
1952	112.5 mm (4.4 in)
1958	209.6 mm (8.3 in)
1959	118.9 mm (4.7 in)
1960	101.7 mm (4.0 in)
1975	11.2 mm (0.4 in)
1977	0.5 mm (0.02 in)
1984	113.5 mm (4.5 in)
1985	142.7 mm (5.6 in)
1986	91.0 mm (3.6 in)
1987	89.7 mm (3.5 in)
1988	99.5 mm (3.9 in)
1989	94.0 mm (3.7 in)
1990	113.8 mm (4.5 in)

Longest dry spell (CDD)

The longest dry spell of the year at Zacatepec (Obs), 1944 to 1990. The record is 118 days in 1986, marked on the chart; the median year is 71 days.

Longest dry spell (CDD) at Zacatepec (Obs) by year
Year	Longest dry spell (CDD)
1944	57 days
1945	48 days
1946	65 days
1947	111 days
1948	65 days
1949	66 days
1950	104 days
1951	77 days
1952	94 days
1958	77 days
1959	31 days
1960	36 days
1975	61 days
1977	61 days
1984	114 days
1985	71 days
1986	118 days
1987	64 days
1988	94 days
1989	115 days
1990	81 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 Zacatepec (Obs) standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Zacatepec (Obs) 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).