Atotonilco Weather Records (MXN00028135)

Record envelope, standing records and threshold days for Atotonilco (MXN00028135), Mexico, with 41 years of record.

Key Facts for Atotonilco

Atotonilco (MXN00028135) is a weather station in Mexico at 22.65 latitude and -98.45 longitude, 46 m (150 ft) above sea level.
The station reports from 1972 to 2012, 41 years of record.
1,464 records set at Atotonilco still stand.
Records are tracked for tmin, prcp: an element needs 30 years of data to be eligible.

About the Station

Location: Mexico, 22.65 latitude, -98.45 longitude.
Elevation: 46 m (150 ft).
Period of record: 1972 to 2012, 41 years.
Eligible elements: 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 Atotonilco. 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 Atotonilco, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	40.6 C (105.1 F)	-1.1 C (30.0 F)	n/a	n/a
Feb	40.0 C (104.0 F)	0.0 C (32.0 F)	n/a	n/a
Mar	43.9 C (111.0 F)	2.8 C (37.0 F)	n/a	n/a
Apr	46.7 C (116.1 F)	5.6 C (42.1 F)	n/a	n/a
May	47.8 C (118.0 F)	10.0 C (50.0 F)	n/a	n/a
Jun	43.9 C (111.0 F)	15.0 C (59.0 F)	n/a	n/a
Jul	40.0 C (104.0 F)	17.8 C (64.0 F)	n/a	n/a
Aug	40.0 C (104.0 F)	17.8 C (64.0 F)	n/a	n/a
Sep	38.9 C (102.0 F)	10.6 C (51.1 F)	n/a	n/a
Oct	43.9 C (111.0 F)	7.8 C (46.0 F)	n/a	n/a
Nov	41.7 C (107.1 F)	0.0 C (32.0 F)	n/a	n/a
Dec	41.7 C (107.1 F)	-4.4 C (24.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Atotonilco still stand. 2012 holds the most, with 127.

Standing records at Atotonilco by the year they were set
Year set	Standing records
1972	46
1973	75
1974	79
1975	54
1976	51
1977	37
1978	44
1979	40
1980	66
1981	29
1982	43
1983	44
1984	58
1985	30
1986	27
1987	48
1988	33
1989	50
1994	13
1996	72
1997	48
1998	69
1999	23
2000	29
2001	26
2002	8
2004	40
2005	29
2006	39
2007	27
2008	33
2009	19
2011	8
2012	127

Wettest Day of Each Month

Jun: 289.3 mm (11.4 in)

The wettest day on record for each calendar month at Atotonilco. The most was 289.3 mm (11.4 in) on 23 June 1973.

Record daily precipitation for each month at Atotonilco
Month	Record daily precipitation (mm)	Date
Jan	26.9 mm (1.1 in)	25 January 1984
Feb	49.8 mm (2.0 in)	16 February 1989
Mar	46.0 mm (1.8 in)	12 March 1974
Apr	89.9 mm (3.5 in)	21 April 1994
May	174.5 mm (6.9 in)	19 May 1976
Jun	289.3 mm (11.4 in)	23 June 1973
Jul	96.8 mm (3.8 in)	27 July 1988
Aug	79.8 mm (3.1 in)	24 August 1989
Sep	200.7 mm (7.9 in)	21 September 1974
Oct	99.8 mm (3.9 in)	11 October 1973
Nov	46.0 mm (1.8 in)	2 November 1984
Dec	99.8 mm (3.9 in)	3 December 1979

Period of Record Coverage

1972 to 2012

35 years of record at Atotonilco, 1972 to 2012. 12 years have data for under 90 percent of days and are left out of rankings: 1972, 1986, 1994, 1996, 2002, 2004, 2007, 2008 and others.

Days with data per year at Atotonilco
Year	Days with data	Share of year	Complete
1972	163	45%	No
1973	362	99%	Yes
1974	363	99%	Yes
1975	359	98%	Yes
1976	350	96%	Yes
1977	362	99%	Yes
1978	361	99%	Yes
1979	363	99%	Yes
1980	360	98%	Yes
1981	363	99%	Yes
1982	364	100%	Yes
1983	359	98%	Yes
1984	366	100%	Yes
1985	334	92%	Yes
1986	321	88%	No
1987	363	99%	Yes
1988	366	100%	Yes
1989	351	96%	Yes
1994	147	40%	No
1996	327	89%	No
1997	364	100%	Yes
1998	365	100%	Yes
1999	365	100%	Yes
2000	364	99%	Yes
2001	365	100%	Yes
2002	31	8%	No
2004	292	80%	No
2005	363	99%	Yes
2006	363	99%	Yes
2007	92	25%	No
2008	273	75%	No
2009	149	41%	No
2010	122	33%	No
2011	153	42%	No
2012	182	50%	No

Latest Records

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

Climate Trend

20 complete years, 1973 to 2006

One stripe for each of 20 complete years at Atotonilco, 1973 to 2006. Blue stripes are years cooler than the station's own mean of 24.2 C (75.5 F); red stripes are warmer. The coolest year was 1984, at 23.1 C (73.6 F), and the warmest was 1998, at 25.8 C (78.4 F). The strongest colour marks a difference of 1.7 C (3.1 F).

Annual mean temperature at Atotonilco as warming stripes, 1973 to 2006
Year	Annual mean temperature	Difference from the station mean
1973	23.5 C	-0.67 C
1974	23.3 C	-0.88 C
1975	23.6 C	-0.54 C
1977	23.9 C	-0.29 C
1978	23.8 C	-0.41 C
1979	23.7 C	-0.50 C
1980	24.0 C	-0.21 C
1981	23.7 C	-0.43 C
1982	24.3 C	+0.10 C
1983	24.1 C	-0.03 C
1984	23.1 C	-1.04 C
1987	23.2 C	-1.01 C
1988	23.6 C	-0.59 C
1997	24.5 C	+0.32 C
1998	25.8 C	+1.64 C
1999	25.1 C	+0.89 C
2000	25.0 C	+0.82 C
2001	24.7 C	+0.52 C
2005	25.0 C	+0.82 C
2006	25.7 C	+1.58 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

1972 to 2012

Yearly extremes at Atotonilco: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	47.8 C (118.0 F)	1973	41.7 C (107.1 F)	35
Coldest night (TNn)	-4.4 C (24.1 F)	1989	3.9 C (39.0 F)	35
Wettest day (Rx1day)	289.3 mm (11.4 in)	1973	69.9 mm (2.8 in)	35
Wettest five days (Rx5day)	507.5 mm (20.0 in)	1973	112.6 mm (4.4 in)	35
Longest dry spell (CDD)	108 days	1998	47 days	35

Hottest day (TXx)

The hottest day of the year at Atotonilco, 1972 to 2012. The record is 47.8 C (118.0 F) in 1973, marked on the chart; the median year is 41.7 C (107.1 F).

Hottest day (TXx) at Atotonilco by year
Year	Hottest day (TXx)
1972	40.0 C (104.0 F)
1973	47.8 C (118.0 F)
1974	45.6 C (114.1 F)
1975	43.9 C (111.0 F)
1976	41.7 C (107.1 F)
1977	40.6 C (105.1 F)
1978	45.0 C (113.0 F)
1979	45.0 C (113.0 F)
1980	43.9 C (111.0 F)
1981	40.0 C (104.0 F)
1982	40.6 C (105.1 F)
1983	41.7 C (107.1 F)
1984	46.7 C (116.1 F)
1985	40.6 C (105.1 F)
1986	38.3 C (100.9 F)
1987	38.3 C (100.9 F)
1988	40.6 C (105.1 F)
1989	41.1 C (106.0 F)
1994	41.1 C (106.0 F)
1996	41.7 C (107.1 F)
1997	42.8 C (109.0 F)
1998	45.6 C (114.1 F)
1999	47.2 C (117.0 F)
2000	42.2 C (108.0 F)
2001	40.6 C (105.1 F)
2002	33.3 C (91.9 F)
2004	43.9 C (111.0 F)
2005	40.0 C (104.0 F)
2006	40.6 C (105.1 F)
2007	42.8 C (109.0 F)
2008	43.9 C (111.0 F)
2009	42.8 C (109.0 F)
2010	37.8 C (100.0 F)
2011	40.0 C (104.0 F)
2012	43.9 C (111.0 F)

Coldest night (TNn)

The coldest night of the year at Atotonilco, 1972 to 2012. The record is -4.4 C (24.1 F) in 1989, marked on the chart; the median year is 3.9 C (39.0 F).

Coldest night (TNn) at Atotonilco by year
Year	Coldest night (TNn)
1972	2.8 C (37.0 F)
1973	-2.2 C (28.0 F)
1974	0.0 C (32.0 F)
1975	0.0 C (32.0 F)
1976	0.6 C (33.1 F)
1977	-1.1 C (30.0 F)
1978	3.9 C (39.0 F)
1979	-1.1 C (30.0 F)
1980	2.8 C (37.0 F)
1981	5.0 C (41.0 F)
1982	0.0 C (32.0 F)
1983	0.0 C (32.0 F)
1984	3.9 C (39.0 F)
1985	0.0 C (32.0 F)
1986	5.0 C (41.0 F)
1987	0.0 C (32.0 F)
1988	0.6 C (33.1 F)
1989	-4.4 C (24.1 F)
1994	5.0 C (41.0 F)
1996	4.4 C (39.9 F)
1997	-1.7 C (28.9 F)
1998	7.2 C (45.0 F)
1999	5.0 C (41.0 F)
2000	5.0 C (41.0 F)
2001	2.8 C (37.0 F)
2002	6.1 C (43.0 F)
2004	0.6 C (33.1 F)
2005	6.7 C (44.1 F)
2006	3.9 C (39.0 F)
2007	5.6 C (42.1 F)
2008	5.0 C (41.0 F)
2009	5.0 C (41.0 F)
2010	5.0 C (41.0 F)
2011	5.0 C (41.0 F)
2012	5.0 C (41.0 F)

Wettest day (Rx1day)

The wettest day of the year at Atotonilco, 1972 to 2012. The record is 289.3 mm (11.4 in) in 1973, marked on the chart; the median year is 69.9 mm (2.8 in).

Wettest day (Rx1day) at Atotonilco by year
Year	Wettest day (Rx1day)
1972	55.9 mm (2.2 in)
1973	289.3 mm (11.4 in)
1974	200.7 mm (7.9 in)
1975	63.5 mm (2.5 in)
1976	174.5 mm (6.9 in)
1977	69.9 mm (2.8 in)
1978	72.9 mm (2.9 in)
1979	112.8 mm (4.4 in)
1980	57.9 mm (2.3 in)
1981	109.0 mm (4.3 in)
1982	77.0 mm (3.0 in)
1983	79.8 mm (3.1 in)
1984	63.8 mm (2.5 in)
1985	63.8 mm (2.5 in)
1986	70.4 mm (2.8 in)
1987	31.5 mm (1.2 in)
1988	96.8 mm (3.8 in)
1989	79.8 mm (3.1 in)
1994	285.0 mm (11.2 in)
1996	45.0 mm (1.8 in)
1997	232.4 mm (9.1 in)
1998	37.8 mm (1.5 in)
1999	72.9 mm (2.9 in)
2000	89.9 mm (3.5 in)
2001	84.8 mm (3.3 in)
2002	15.0 mm (0.6 in)
2004	62.5 mm (2.5 in)
2005	69.9 mm (2.8 in)
2006	65.8 mm (2.6 in)
2007	30.0 mm (1.2 in)
2008	39.9 mm (1.6 in)
2009	36.8 mm (1.4 in)
2010	24.9 mm (1.0 in)
2011	15.7 mm (0.6 in)
2012	15.7 mm (0.6 in)

Wettest five days (Rx5day)

The wettest five days of the year at Atotonilco, 1972 to 2012. The record is 507.5 mm (20.0 in) in 1973, marked on the chart; the median year is 112.6 mm (4.4 in).

Wettest five days (Rx5day) at Atotonilco by year
Year	Wettest five days (Rx5day)
1972	94.6 mm (3.7 in)
1973	507.5 mm (20.0 in)
1974	228.9 mm (9.0 in)
1975	178.9 mm (7.0 in)
1976	243.1 mm (9.6 in)
1977	100.6 mm (4.0 in)
1978	175.6 mm (6.9 in)
1979	160.2 mm (6.3 in)
1980	110.9 mm (4.4 in)
1981	227.4 mm (9.0 in)
1982	118.1 mm (4.6 in)
1983	136.4 mm (5.4 in)
1984	111.2 mm (4.4 in)
1985	111.6 mm (4.4 in)
1986	83.9 mm (3.3 in)
1987	54.3 mm (2.1 in)
1988	128.3 mm (5.1 in)
1989	124.2 mm (4.9 in)
1994	332.6 mm (13.1 in)
1996	78.3 mm (3.1 in)
1997	452.4 mm (17.8 in)
1998	105.2 mm (4.1 in)
1999	184.2 mm (7.3 in)
2000	165.9 mm (6.5 in)
2001	91.2 mm (3.6 in)
2002	15.0 mm (0.6 in)
2004	112.6 mm (4.4 in)
2005	123.5 mm (4.9 in)
2006	112.6 mm (4.4 in)
2007	76.7 mm (3.0 in)
2008	39.9 mm (1.6 in)
2009	36.8 mm (1.4 in)
2010	64.5 mm (2.5 in)
2011	15.7 mm (0.6 in)
2012	17.5 mm (0.7 in)

Longest dry spell (CDD)

The longest dry spell of the year at Atotonilco, 1972 to 2012. The record is 108 days in 1998, marked on the chart; the median year is 47 days.

Longest dry spell (CDD) at Atotonilco by year
Year	Longest dry spell (CDD)
1972	25 days
1973	42 days
1974	32 days
1975	64 days
1976	43 days
1977	41 days
1978	48 days
1979	58 days
1980	47 days
1981	61 days
1982	58 days
1983	74 days
1984	77 days
1985	26 days
1986	27 days
1987	66 days
1988	62 days
1989	46 days
1994	38 days
1996	29 days
1997	30 days
1998	108 days
1999	52 days
2000	51 days
2001	53 days
2002	16 days
2004	35 days
2005	39 days
2006	33 days
2007	33 days
2008	79 days
2009	58 days
2010	18 days
2011	79 days
2012	91 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 Atotonilco standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Atotonilco 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 2026-10-16 (16 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).