Alponocan Weather Records (MXN00017060)

Record envelope, standing records and threshold days for Alponocan (MXN00017060), Mexico, with 33 years of record.

Key Facts for Alponocan

Alponocan (MXN00017060) is a weather station in Mexico at 18.92 latitude and -98.68 longitude, 2,769 m (9,084 ft) above sea level.
The station reports from 1980 to 2012, 33 years of record.
1,464 records set at Alponocan still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Alponocan tied a daily record low minimum temperature of 3.9 C (39.0 F) on 30 December 2012.

About the Station

Location: Mexico, 18.92 latitude, -98.68 longitude.
Elevation: 2,769 m (9,084 ft).
Period of record: 1980 to 2012, 33 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 Alponocan. 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 Alponocan, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	30.6 C (87.1 F)	0.0 C (32.0 F)	n/a	n/a
Feb	35.0 C (95.0 F)	-1.7 C (28.9 F)	n/a	n/a
Mar	35.6 C (96.1 F)	0.6 C (33.1 F)	n/a	n/a
Apr	38.3 C (100.9 F)	5.6 C (42.1 F)	n/a	n/a
May	38.3 C (100.9 F)	5.6 C (42.1 F)	n/a	n/a
Jun	31.7 C (89.1 F)	6.1 C (43.0 F)	n/a	n/a
Jul	30.0 C (86.0 F)	5.0 C (41.0 F)	n/a	n/a
Aug	30.0 C (86.0 F)	6.1 C (43.0 F)	n/a	n/a
Sep	28.9 C (84.0 F)	5.6 C (42.1 F)	n/a	n/a
Oct	29.4 C (84.9 F)	1.7 C (35.1 F)	n/a	n/a
Nov	30.6 C (87.1 F)	0.6 C (33.1 F)	n/a	n/a
Dec	30.0 C (86.0 F)	1.1 C (34.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Alponocan still stand. 2012 holds the most, with 151.

Standing records at Alponocan by the year they were set
Year set	Standing records
1980	23
1981	41
1982	45
1983	83
1984	32
1985	51
1986	81
1987	116
1988	67
1989	75
1990	53
1991	51
1992	28
1993	26
1994	6
1995	26
1996	35
1997	15
1998	31
1999	21
2000	44
2001	58
2002	57
2003	57
2004	21
2005	36
2006	30
2007	28
2008	20
2009	12
2010	27
2011	17
2012	151

Wettest Day of Each Month

Jul: 106.2 mm (4.2 in)

The wettest day on record for each calendar month at Alponocan. The most was 106.2 mm (4.2 in) on 27 July 1981.

Record daily precipitation for each month at Alponocan
Month	Record daily precipitation (mm)	Date
Jan	32.3 mm (1.3 in)	29 January 1992
Feb	88.4 mm (3.5 in)	4 February 2010
Mar	17.8 mm (0.7 in)	4 March 1988
Apr	36.8 mm (1.4 in)	27 April 1987
May	65.8 mm (2.6 in)	18 May 1982
Jun	82.0 mm (3.2 in)	25 June 2012
Jul	106.2 mm (4.2 in)	27 July 1981
Aug	93.5 mm (3.7 in)	17 August 2010
Sep	75.7 mm (3.0 in)	4 September 2010
Oct	96.3 mm (3.8 in)	14 October 1990
Nov	58.9 mm (2.3 in)	10 November 1990
Dec	19.8 mm (0.8 in)	30 December 1995

Period of Record Coverage

1980 to 2012

33 years of record at Alponocan, 1980 to 2012. 1 years have data for under 90 percent of days and are left out of rankings: 1980.

Days with data per year at Alponocan
Year	Days with data	Share of year	Complete
1980	240	66%	No
1981	365	100%	Yes
1982	329	90%	Yes
1983	365	100%	Yes
1984	366	100%	Yes
1985	365	100%	Yes
1986	365	100%	Yes
1987	365	100%	Yes
1988	366	100%	Yes
1989	365	100%	Yes
1990	365	100%	Yes
1991	365	100%	Yes
1992	366	100%	Yes
1993	365	100%	Yes
1994	365	100%	Yes
1995	339	93%	Yes
1996	366	100%	Yes
1997	334	92%	Yes
1998	364	100%	Yes
1999	365	100%	Yes
2000	366	100%	Yes
2001	365	100%	Yes
2002	334	92%	Yes
2003	334	92%	Yes
2004	366	100%	Yes
2005	365	100%	Yes
2006	365	100%	Yes
2007	365	100%	Yes
2008	366	100%	Yes
2009	365	100%	Yes
2010	365	100%	Yes
2011	365	100%	Yes
2012	366	100%	Yes

Latest Records

Latest records at Alponocan
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
30 December 2012	Alponocan, MX	daily low min (Tie)	3.9 C (39.0 F)	tie	13 years	1 of 100 (Routine)
29 December 2012	Alponocan, MX	daily low max (Tie)	17.8 C (64.0 F)	tie	23 years	2 of 100 (Routine)
28 December 2012	Alponocan, MX	daily low min (Tie)	5.0 C (41.0 F)	tie	18 years	2 of 100 (Routine)
22 December 2012	Alponocan, MX	daily low max (Tie)	17.8 C (64.0 F)	tie	32 years	3 of 100 (Routine)
21 December 2012	Alponocan, MX	daily low min	3.9 C (39.0 F)	0.5 C (0.9 F)	3 years	5 of 100 (Routine)
19 December 2012	Alponocan, MX	daily low min (Tie)	5.0 C (41.0 F)	tie	14 years	1 of 100 (Routine)
18 December 2012	Alponocan, MX	daily low min (Tie)	3.9 C (39.0 F)	tie	32 years	3 of 100 (Routine)
17 December 2012	Alponocan, MX	daily low min	3.9 C (39.0 F)	1.1 C (2.0 F)	32 years	18 of 100 (Routine)
16 December 2012	Alponocan, MX	daily low min (Tie)	5.0 C (41.0 F)	tie	29 years	2 of 100 (Routine)
15 December 2012	Alponocan, MX	daily low min	2.8 C (37.0 F)	1.1 C (2.0 F)	2 years	9 of 100 (Routine)
14 December 2012	Alponocan, MX	daily low max (Tie)	17.8 C (64.0 F)	tie	30 years	3 of 100 (Routine)
13 December 2012	Alponocan, MX	daily low max	16.7 C (62.1 F)	1.1 C (2.0 F)	28 years	14 of 100 (Routine)
12 December 2012	Alponocan, MX	daily low min	3.9 C (39.0 F)	0.5 C (0.9 F)	20 years	11 of 100 (Routine)
11 December 2012	Alponocan, MX	daily low min	2.8 C (37.0 F)	1.6 C (2.9 F)	20 years	18 of 100 (Routine)
11 December 2012	Alponocan, MX	daily low max	17.8 C (64.0 F)	1.1 C (2.0 F)	32 years	15 of 100 (Routine)
10 December 2012	Alponocan, MX	daily low min	3.9 C (39.0 F)	0.5 C (0.9 F)	2 years	5 of 100 (Routine)
8 December 2012	Alponocan, MX	daily low min	2.8 C (37.0 F)	2.2 C (4.0 F)	28 years	24 of 100 (Routine)
7 December 2012	Alponocan, MX	daily low min	3.9 C (39.0 F)	0.5 C (0.9 F)	2 years	5 of 100 (Routine)
6 December 2012	Alponocan, MX	daily low max (Tie)	17.8 C (64.0 F)	tie	24 years	2 of 100 (Routine)
3 December 2012	Alponocan, MX	daily low min	3.9 C (39.0 F)	0.5 C (0.9 F)	13 years	8 of 100 (Routine)

Climate Trend

27 complete years, 1981 to 2012

One stripe for each of 27 complete years at Alponocan, 1981 to 2012. Blue stripes are years cooler than the station's own mean of 16.5 C (61.7 F); red stripes are warmer. The coolest year was 2012, at 14.8 C (58.7 F), and the warmest was 2005, at 18.2 C (64.8 F). The strongest colour marks a difference of 1.8 C (3.2 F).

Annual mean temperature at Alponocan as warming stripes, 1981 to 2012
Year	Annual mean temperature	Difference from the station mean
1981	15.4 C	-1.14 C
1983	15.5 C	-0.99 C
1984	15.5 C	-1.02 C
1985	15.5 C	-0.99 C
1986	15.7 C	-0.83 C
1987	16.3 C	-0.18 C
1988	16.9 C	+0.41 C
1989	15.5 C	-0.98 C
1990	15.3 C	-1.21 C
1991	16.1 C	-0.39 C
1992	15.7 C	-0.83 C
1993	16.1 C	-0.42 C
1994	16.0 C	-0.51 C
1996	15.3 C	-1.16 C
1998	16.6 C	+0.06 C
1999	16.7 C	+0.17 C
2000	17.0 C	+0.53 C
2001	18.1 C	+1.64 C
2004	17.5 C	+1.01 C
2005	18.2 C	+1.71 C
2006	17.8 C	+1.32 C
2007	17.9 C	+1.42 C
2008	17.5 C	+1.02 C
2009	17.7 C	+1.21 C
2010	17.2 C	+0.75 C
2011	17.6 C	+1.08 C
2012	14.8 C	-1.66 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

1980 to 2012

Yearly extremes at Alponocan: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	38.3 C (100.9 F)	1989	31.7 C (89.1 F)	33
Coldest night (TNn)	-1.7 C (28.9 F)	1989	2.2 C (36.0 F)	33
Wettest day (Rx1day)	106.2 mm (4.2 in)	1981	57.2 mm (2.3 in)	33
Wettest five days (Rx5day)	206.5 mm (8.1 in)	2012	124.0 mm (4.9 in)	33
Longest dry spell (CDD)	134 days	1999	72 days	33

Hottest day (TXx)

The hottest day of the year at Alponocan, 1980 to 2012. The record is 38.3 C (100.9 F) in 1989, marked on the chart; the median year is 31.7 C (89.1 F).

Hottest day (TXx) at Alponocan by year
Year	Hottest day (TXx)
1980	27.8 C (82.0 F)
1981	28.3 C (82.9 F)
1982	30.0 C (86.0 F)
1983	30.0 C (86.0 F)
1984	32.2 C (90.0 F)
1985	29.4 C (84.9 F)
1986	30.0 C (86.0 F)
1987	29.4 C (84.9 F)
1988	31.7 C (89.1 F)
1989	38.3 C (100.9 F)
1990	28.3 C (82.9 F)
1991	30.6 C (87.1 F)
1992	28.9 C (84.0 F)
1993	30.6 C (87.1 F)
1994	30.0 C (86.0 F)
1995	30.0 C (86.0 F)
1996	30.0 C (86.0 F)
1997	27.8 C (82.0 F)
1998	35.0 C (95.0 F)
1999	33.3 C (91.9 F)
2000	31.7 C (89.1 F)
2001	35.6 C (96.1 F)
2002	35.6 C (96.1 F)
2003	38.3 C (100.9 F)
2004	33.9 C (93.0 F)
2005	33.3 C (91.9 F)
2006	34.4 C (93.9 F)
2007	35.0 C (95.0 F)
2008	32.8 C (91.0 F)
2009	33.3 C (91.9 F)
2010	35.0 C (95.0 F)
2011	31.7 C (89.1 F)
2012	32.8 C (91.0 F)

Coldest night (TNn)

The coldest night of the year at Alponocan, 1980 to 2012. The record is -1.7 C (28.9 F) in 1989, marked on the chart; the median year is 2.2 C (36.0 F).

Coldest night (TNn) at Alponocan by year
Year	Coldest night (TNn)
1980	2.8 C (37.0 F)
1981	2.2 C (36.0 F)
1982	4.4 C (39.9 F)
1983	3.9 C (39.0 F)
1984	1.7 C (35.1 F)
1985	5.0 C (41.0 F)
1986	0.6 C (33.1 F)
1987	2.2 C (36.0 F)
1988	0.0 C (32.0 F)
1989	-1.7 C (28.9 F)
1990	0.6 C (33.1 F)
1991	3.9 C (39.0 F)
1992	1.7 C (35.1 F)
1993	5.0 C (41.0 F)
1994	4.4 C (39.9 F)
1995	2.2 C (36.0 F)
1996	0.0 C (32.0 F)
1997	1.7 C (35.1 F)
1998	1.1 C (34.0 F)
1999	1.7 C (35.1 F)
2000	2.2 C (36.0 F)
2001	4.4 C (39.9 F)
2002	3.3 C (37.9 F)
2003	4.4 C (39.9 F)
2004	3.3 C (37.9 F)
2005	2.2 C (36.0 F)
2006	1.1 C (34.0 F)
2007	4.4 C (39.9 F)
2008	2.2 C (36.0 F)
2009	2.2 C (36.0 F)
2010	1.7 C (35.1 F)
2011	4.4 C (39.9 F)
2012	1.7 C (35.1 F)

Wettest day (Rx1day)

The wettest day of the year at Alponocan, 1980 to 2012. The record is 106.2 mm (4.2 in) in 1981, marked on the chart; the median year is 57.2 mm (2.3 in).

Wettest day (Rx1day) at Alponocan by year
Year	Wettest day (Rx1day)
1980	78.5 mm (3.1 in)
1981	106.2 mm (4.2 in)
1982	65.8 mm (2.6 in)
1983	62.2 mm (2.4 in)
1984	70.1 mm (2.8 in)
1985	50.8 mm (2.0 in)
1986	42.7 mm (1.7 in)
1987	48.3 mm (1.9 in)
1988	80.3 mm (3.2 in)
1989	27.9 mm (1.1 in)
1990	96.3 mm (3.8 in)
1991	72.4 mm (2.9 in)
1992	47.2 mm (1.9 in)
1993	64.8 mm (2.6 in)
1994	52.1 mm (2.1 in)
1995	38.9 mm (1.5 in)
1996	53.3 mm (2.1 in)
1997	42.2 mm (1.7 in)
1998	53.1 mm (2.1 in)
1999	81.3 mm (3.2 in)
2000	41.9 mm (1.6 in)
2001	62.2 mm (2.4 in)
2002	49.5 mm (1.9 in)
2003	37.1 mm (1.5 in)
2004	41.7 mm (1.6 in)
2005	57.4 mm (2.3 in)
2006	84.6 mm (3.3 in)
2007	45.7 mm (1.8 in)
2008	57.2 mm (2.3 in)
2009	63.8 mm (2.5 in)
2010	93.5 mm (3.7 in)
2011	54.1 mm (2.1 in)
2012	87.4 mm (3.4 in)

Wettest five days (Rx5day)

The wettest five days of the year at Alponocan, 1980 to 2012. The record is 206.5 mm (8.1 in) in 2012, marked on the chart; the median year is 124.0 mm (4.9 in).

Wettest five days (Rx5day) at Alponocan by year
Year	Wettest five days (Rx5day)
1980	127.2 mm (5.0 in)
1981	129.0 mm (5.1 in)
1982	136.7 mm (5.4 in)
1983	152.5 mm (6.0 in)
1984	176.3 mm (6.9 in)
1985	106.2 mm (4.2 in)
1986	120.9 mm (4.8 in)
1987	113.0 mm (4.4 in)
1988	188.1 mm (7.4 in)
1989	72.9 mm (2.9 in)
1990	140.3 mm (5.5 in)
1991	98.9 mm (3.9 in)
1992	105.3 mm (4.1 in)
1993	149.6 mm (5.9 in)
1994	70.4 mm (2.8 in)
1995	92.5 mm (3.6 in)
1996	160.0 mm (6.3 in)
1997	82.8 mm (3.3 in)
1998	157.7 mm (6.2 in)
1999	168.2 mm (6.6 in)
2000	102.9 mm (4.1 in)
2001	113.5 mm (4.5 in)
2002	124.0 mm (4.9 in)
2003	111.5 mm (4.4 in)
2004	111.6 mm (4.4 in)
2005	99.6 mm (3.9 in)
2006	138.2 mm (5.4 in)
2007	122.1 mm (4.8 in)
2008	125.8 mm (5.0 in)
2009	116.3 mm (4.6 in)
2010	181.9 mm (7.2 in)
2011	129.8 mm (5.1 in)
2012	206.5 mm (8.1 in)

Longest dry spell (CDD)

The longest dry spell of the year at Alponocan, 1980 to 2012. The record is 134 days in 1999, marked on the chart; the median year is 72 days.

Longest dry spell (CDD) at Alponocan by year
Year	Longest dry spell (CDD)
1980	35 days
1981	36 days
1982	58 days
1983	72 days
1984	89 days
1985	37 days
1986	101 days
1987	63 days
1988	79 days
1989	100 days
1990	51 days
1991	118 days
1992	83 days
1993	75 days
1994	83 days
1995	44 days
1996	101 days
1997	67 days
1998	130 days
1999	134 days
2000	119 days
2001	103 days
2002	55 days
2003	59 days
2004	59 days
2005	71 days
2006	81 days
2007	70 days
2008	118 days
2009	67 days
2010	58 days
2011	104 days
2012	56 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

32 years, 1981 to 2012

A day with at least 57.0 mm (2.2 in) of rain is expected about once in 2 years. A day with at least 124.0 mm (4.9 in) of rain is expected about once in 100 years.

Rainfall return levels at Alponocan: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	57.0 mm (2.2 in)
5 years	74.7 mm (2.9 in)
10 years	86.5 mm (3.4 in)
25 years	101.5 mm (4.0 in)
50 years	112.7 mm (4.4 in)	Longer than the 32 years of record
100 years	124.0 mm (4.9 in)	Longer than the 32 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, 32 years of values from 1981 to 2012.

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: 106.2 mm (4.2 in) in 1981; 96.3 mm (3.8 in) in 1990; 93.5 mm (3.7 in) in 2010.

Download the Data

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