Atlacomulco II (Dge) Weather Records (MXN00015251)

Record envelope, standing records and threshold days for Atlacomulco II (Dge) (MXN00015251), Mexico, with 31 years of record.

Key Facts for Atlacomulco II (Dge)

Atlacomulco II (Dge) (MXN00015251) is a weather station in Mexico at 19.78 latitude and -99.87 longitude, 2,574 m (8,444 ft) above sea level.
The station reports from 1978 to 2008, 31 years of record.
1,464 records set at Atlacomulco II (Dge) still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.

About the Station

Location: Mexico, 19.78 latitude, -99.87 longitude.
Elevation: 2,574 m (8,444 ft).
Period of record: 1978 to 2008, 31 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 Atlacomulco II (Dge). 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 Atlacomulco II (Dge), with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	24.4 C (75.9 F)	-10.0 C (14.0 F)	n/a	n/a
Feb	26.7 C (80.1 F)	-9.4 C (15.1 F)	n/a	n/a
Mar	30.0 C (86.0 F)	-7.8 C (18.0 F)	n/a	n/a
Apr	32.2 C (90.0 F)	-2.8 C (27.0 F)	n/a	n/a
May	33.3 C (91.9 F)	-1.1 C (30.0 F)	n/a	n/a
Jun	31.1 C (88.0 F)	0.0 C (32.0 F)	n/a	n/a
Jul	28.9 C (84.0 F)	1.1 C (34.0 F)	n/a	n/a
Aug	25.0 C (77.0 F)	1.1 C (34.0 F)	n/a	n/a
Sep	28.9 C (84.0 F)	-4.4 C (24.1 F)	n/a	n/a
Oct	25.6 C (78.1 F)	-5.0 C (23.0 F)	n/a	n/a
Nov	25.6 C (78.1 F)	-7.2 C (19.0 F)	n/a	n/a
Dec	25.0 C (77.0 F)	-9.4 C (15.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Atlacomulco II (Dge) still stand. 1987 holds the most, with 91.

Standing records at Atlacomulco II (Dge) by the year they were set
Year set	Standing records
1978	68
1979	86
1980	74
1981	48
1982	54
1983	67
1984	46
1985	38
1986	58
1987	91
1988	72
1989	33
1990	48
1991	22
1992	42
1993	19
1994	37
1995	65
1996	37
1997	55
1998	86
1999	72
2000	60
2001	29
2002	37
2003	29
2004	9
2005	23
2006	42
2008	17

Wettest Day of Each Month

Aug: 68.8 mm (2.7 in)

The wettest day on record for each calendar month at Atlacomulco II (Dge). The most was 68.8 mm (2.7 in) on 19 August 1984.

Record daily precipitation for each month at Atlacomulco II (Dge)
Month	Record daily precipitation (mm)	Date
Jan	44.5 mm (1.8 in)	28 January 1992
Feb	38.4 mm (1.5 in)	20 February 1992
Mar	35.3 mm (1.4 in)	4 March 1988
Apr	26.9 mm (1.1 in)	12 April 1985
May	50.3 mm (2.0 in)	24 May 1982
Jun	55.9 mm (2.2 in)	10 June 1978
Jul	60.5 mm (2.4 in)	6 July 2005
Aug	68.8 mm (2.7 in)	19 August 1984
Sep	63.8 mm (2.5 in)	17 September 1998
Oct	61.5 mm (2.4 in)	5 October 1996
Nov	29.0 mm (1.1 in)	21 November 1997
Dec	31.8 mm (1.3 in)	12 December 1988

Period of Record Coverage

1978 to 2008

30 years of record at Atlacomulco II (Dge), 1978 to 2008. 2 years have data for under 90 percent of days and are left out of rankings: 1989, 1993.

Days with data per year at Atlacomulco II (Dge)
Year	Days with data	Share of year	Complete
1978	349	96%	Yes
1979	355	97%	Yes
1980	358	98%	Yes
1981	363	99%	Yes
1982	358	98%	Yes
1983	355	97%	Yes
1984	358	98%	Yes
1985	356	98%	Yes
1986	348	95%	Yes
1987	357	98%	Yes
1988	359	98%	Yes
1989	235	64%	No
1990	364	100%	Yes
1991	365	100%	Yes
1992	366	100%	Yes
1993	257	70%	No
1994	365	100%	Yes
1995	363	99%	Yes
1996	359	98%	Yes
1997	360	99%	Yes
1998	354	97%	Yes
1999	362	99%	Yes
2000	366	100%	Yes
2001	365	100%	Yes
2002	362	99%	Yes
2003	365	100%	Yes
2004	365	100%	Yes
2005	360	99%	Yes
2006	360	99%	Yes
2008	366	100%	Yes

Latest Records

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

Climate Trend

26 complete years, 1978 to 2008

One stripe for each of 26 complete years at Atlacomulco II (Dge), 1978 to 2008. Blue stripes are years cooler than the station's own mean of 12.4 C (54.4 F); red stripes are warmer. The coolest year was 2000, at 11.3 C (52.3 F), and the warmest was 1998, at 13.2 C (55.8 F). The strongest colour marks a difference of 1.2 C (2.2 F).

Annual mean temperature at Atlacomulco II (Dge) as warming stripes, 1978 to 2008
Year	Annual mean temperature	Difference from the station mean
1978	12.7 C	+0.30 C
1979	12.6 C	+0.17 C
1980	12.9 C	+0.46 C
1981	12.5 C	+0.05 C
1982	12.7 C	+0.28 C
1983	12.7 C	+0.29 C
1984	12.5 C	+0.03 C
1985	12.5 C	+0.06 C
1986	12.6 C	+0.11 C
1987	12.7 C	+0.21 C
1988	12.9 C	+0.46 C
1990	12.8 C	+0.35 C
1994	12.9 C	+0.43 C
1995	13.0 C	+0.58 C
1996	12.6 C	+0.16 C
1997	12.6 C	+0.14 C
1998	13.2 C	+0.77 C
1999	12.1 C	-0.34 C
2000	11.3 C	-1.15 C
2001	12.2 C	-0.24 C
2002	12.5 C	+0.01 C
2003	11.7 C	-0.79 C
2004	11.6 C	-0.82 C
2005	12.1 C	-0.37 C
2006	12.1 C	-0.38 C
2008	11.7 C	-0.75 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

1978 to 2008

Yearly extremes at Atlacomulco II (Dge): the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	33.3 C (91.9 F)	1998	28.9 C (84.0 F)	30
Coldest night (TNn)	-10.0 C (14.0 F)	1986	-7.2 C (19.0 F)	30
Wettest day (Rx1day)	68.8 mm (2.7 in)	1984	39.2 mm (1.5 in)	30
Wettest five days (Rx5day)	160.0 mm (6.3 in)	1984	84.1 mm (3.3 in)	30
Longest dry spell (CDD)	128 days	1998	60 days	30

Hottest day (TXx)

The hottest day of the year at Atlacomulco II (Dge), 1978 to 2008. The record is 33.3 C (91.9 F) in 1998, marked on the chart; the median year is 28.9 C (84.0 F).

Hottest day (TXx) at Atlacomulco II (Dge) by year
Year	Hottest day (TXx)
1978	28.9 C (84.0 F)
1979	28.9 C (84.0 F)
1980	28.9 C (84.0 F)
1981	27.2 C (81.0 F)
1982	28.3 C (82.9 F)
1983	31.1 C (88.0 F)
1984	28.9 C (84.0 F)
1985	27.8 C (82.0 F)
1986	28.9 C (84.0 F)
1987	27.2 C (81.0 F)
1988	30.0 C (86.0 F)
1989	29.4 C (84.9 F)
1990	28.3 C (82.9 F)
1991	29.4 C (84.9 F)
1992	26.1 C (79.0 F)
1993	27.2 C (81.0 F)
1994	28.9 C (84.0 F)
1995	30.6 C (87.1 F)
1996	28.3 C (82.9 F)
1997	27.2 C (81.0 F)
1998	33.3 C (91.9 F)
1999	29.4 C (84.9 F)
2000	29.4 C (84.9 F)
2001	30.0 C (86.0 F)
2002	32.2 C (90.0 F)
2003	31.7 C (89.1 F)
2004	28.3 C (82.9 F)
2005	31.1 C (88.0 F)
2006	30.6 C (87.1 F)
2008	28.9 C (84.0 F)

Coldest night (TNn)

The coldest night of the year at Atlacomulco II (Dge), 1978 to 2008. The record is -10.0 C (14.0 F) in 1986, marked on the chart; the median year is -7.2 C (19.0 F).

Coldest night (TNn) at Atlacomulco II (Dge) by year
Year	Coldest night (TNn)
1978	-7.2 C (19.0 F)
1979	-6.1 C (21.0 F)
1980	-7.2 C (19.0 F)
1981	-6.7 C (19.9 F)
1982	-7.8 C (18.0 F)
1983	-6.1 C (21.0 F)
1984	-6.7 C (19.9 F)
1985	-6.1 C (21.0 F)
1986	-10.0 C (14.0 F)
1987	-8.3 C (17.1 F)
1988	-9.4 C (15.1 F)
1989	-7.8 C (18.0 F)
1990	-6.7 C (19.9 F)
1991	-5.0 C (23.0 F)
1992	-3.9 C (25.0 F)
1993	-5.6 C (21.9 F)
1994	-6.7 C (19.9 F)
1995	-5.0 C (23.0 F)
1996	-8.3 C (17.1 F)
1997	-8.9 C (16.0 F)
1998	-8.9 C (16.0 F)
1999	-8.9 C (16.0 F)
2000	-9.4 C (15.1 F)
2001	-4.4 C (24.1 F)
2002	-7.2 C (19.0 F)
2003	-7.8 C (18.0 F)
2004	-7.8 C (18.0 F)
2005	-5.0 C (23.0 F)
2006	-9.4 C (15.1 F)
2008	-6.1 C (21.0 F)

Wettest day (Rx1day)

The wettest day of the year at Atlacomulco II (Dge), 1978 to 2008. The record is 68.8 mm (2.7 in) in 1984, marked on the chart; the median year is 39.2 mm (1.5 in).

Wettest day (Rx1day) at Atlacomulco II (Dge) by year
Year	Wettest day (Rx1day)
1978	55.9 mm (2.2 in)
1979	49.8 mm (2.0 in)
1980	36.8 mm (1.4 in)
1981	34.8 mm (1.4 in)
1982	53.3 mm (2.1 in)
1983	36.3 mm (1.4 in)
1984	68.8 mm (2.7 in)
1985	38.4 mm (1.5 in)
1986	33.8 mm (1.3 in)
1987	31.0 mm (1.2 in)
1988	39.9 mm (1.6 in)
1989	29.5 mm (1.2 in)
1990	41.4 mm (1.6 in)
1991	24.9 mm (1.0 in)
1992	44.5 mm (1.8 in)
1993	37.8 mm (1.5 in)
1994	26.9 mm (1.1 in)
1995	32.8 mm (1.3 in)
1996	61.5 mm (2.4 in)
1997	36.8 mm (1.4 in)
1998	63.8 mm (2.5 in)
1999	37.3 mm (1.5 in)
2000	49.8 mm (2.0 in)
2001	34.8 mm (1.4 in)
2002	48.3 mm (1.9 in)
2003	53.3 mm (2.1 in)
2004	40.4 mm (1.6 in)
2005	60.5 mm (2.4 in)
2006	41.9 mm (1.6 in)
2008	33.3 mm (1.3 in)

Wettest five days (Rx5day)

The wettest five days of the year at Atlacomulco II (Dge), 1978 to 2008. The record is 160.0 mm (6.3 in) in 1984, marked on the chart; the median year is 84.1 mm (3.3 in).

Wettest five days (Rx5day) at Atlacomulco II (Dge) by year
Year	Wettest five days (Rx5day)
1978	81.1 mm (3.2 in)
1979	55.2 mm (2.2 in)
1980	78.3 mm (3.1 in)
1981	55.9 mm (2.2 in)
1982	88.0 mm (3.5 in)
1983	103.9 mm (4.1 in)
1984	160.0 mm (6.3 in)
1985	73.2 mm (2.9 in)
1986	94.2 mm (3.7 in)
1987	84.3 mm (3.3 in)
1988	68.4 mm (2.7 in)
1989	87.7 mm (3.5 in)
1990	59.4 mm (2.3 in)
1991	70.6 mm (2.8 in)
1992	77.5 mm (3.1 in)
1993	83.8 mm (3.3 in)
1994	50.6 mm (2.0 in)
1995	74.5 mm (2.9 in)
1996	89.4 mm (3.5 in)
1997	78.7 mm (3.1 in)
1998	149.1 mm (5.9 in)
1999	99.4 mm (3.9 in)
2000	84.6 mm (3.3 in)
2001	77.5 mm (3.1 in)
2002	98.4 mm (3.9 in)
2003	118.2 mm (4.7 in)
2004	110.0 mm (4.3 in)
2005	122.5 mm (4.8 in)
2006	70.4 mm (2.8 in)
2008	84.8 mm (3.3 in)

Longest dry spell (CDD)

The longest dry spell of the year at Atlacomulco II (Dge), 1978 to 2008. The record is 128 days in 1998, marked on the chart; the median year is 60 days.

Longest dry spell (CDD) at Atlacomulco II (Dge) by year
Year	Longest dry spell (CDD)
1978	43 days
1979	36 days
1980	31 days
1981	36 days
1982	79 days
1983	68 days
1984	90 days
1985	57 days
1986	100 days
1987	65 days
1988	41 days
1989	46 days
1990	40 days
1991	41 days
1992	27 days
1993	48 days
1994	62 days
1995	51 days
1996	114 days
1997	65 days
1998	128 days
1999	71 days
2000	67 days
2001	47 days
2002	46 days
2003	86 days
2004	74 days
2005	72 days
2006	48 days
2008	80 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.

Frost Dates and Growing Season

26 years with a frost

Across 26 years with a frost, the median last spring frost at Atlacomulco II (Dge) falls on 4 April and the median first autumn frost on 25 October, which leaves a median of 206 days between them.

Fitted over all years, the growing season changes by -0.7 days per decade at this station.

Frost dates and growing season at Atlacomulco II (Dge)
Measure	Median, all years	Earliest period	Recent period (1978 to 2008)	Recent against earliest	Fitted trend
Last spring frost	4 April	n/a	4 April	n/a	+1.9 days per decade
First autumn frost	25 October	n/a	25 October	n/a	+1.1 days per decade
Growing days	206 days	n/a	206 days	n/a	-0.7 days per decade

A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.

Download the Data

Data for Atlacomulco II (Dge) standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Atlacomulco II (Dge) 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).