Ahuehuepan Weather Records (MXN00012004)

Record envelope, standing records and threshold days for Ahuehuepan (MXN00012004), Mexico, with 54 years of record.

Key Facts for Ahuehuepan

Ahuehuepan (MXN00012004) is a weather station in Mexico at 18.33 latitude and -99.63 longitude, 760 m (2,493 ft) above sea level.
The station reports from 1960 to 2013, 54 years of record.
1,464 records set at Ahuehuepan still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Ahuehuepan set a daily record high maximum temperature of 40.6 C (105.1 F) on 18 May 2013.

About the Station

Location: Mexico, 18.33 latitude, -99.63 longitude.
Elevation: 760 m (2,493 ft).
Period of record: 1960 to 2013, 54 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 Ahuehuepan. 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 Ahuehuepan, 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)	4.4 C (39.9 F)	n/a	n/a
Feb	38.9 C (102.0 F)	4.4 C (39.9 F)	n/a	n/a
Mar	41.7 C (107.1 F)	8.9 C (48.0 F)	n/a	n/a
Apr	42.8 C (109.0 F)	8.3 C (46.9 F)	n/a	n/a
May	43.9 C (111.0 F)	13.3 C (55.9 F)	n/a	n/a
Jun	48.9 C (120.0 F)	13.9 C (57.0 F)	n/a	n/a
Jul	41.7 C (107.1 F)	12.2 C (54.0 F)	n/a	n/a
Aug	41.1 C (106.0 F)	11.7 C (53.1 F)	n/a	n/a
Sep	36.1 C (97.0 F)	12.8 C (55.0 F)	n/a	n/a
Oct	36.7 C (98.1 F)	8.3 C (46.9 F)	n/a	n/a
Nov	37.8 C (100.0 F)	5.0 C (41.0 F)	n/a	n/a
Dec	40.6 C (105.1 F)	1.7 C (35.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Ahuehuepan still stand. 1974 holds the most, with 151.

Standing records at Ahuehuepan by the year they were set
Year set	Standing records
1960	21
1961	40
1962	72
1963	33
1964	17
1965	27
1966	49
1967	50
1968	19
1969	24
1970	44
1971	26
1972	16
1973	105
1974	151
1975	100
1976	28
1977	10
1978	14
1979	41
1980	50
1981	6
1982	14
1983	11
1984	14
1985	7
1986	12
1987	19
1988	12
1989	10
1990	8
1991	12
1992	29
1993	64
1994	7
1995	10
1996	23
1997	18
1998	35
1999	31
2000	27
2001	10
2002	22
2003	11
2004	4
2005	7
2006	14
2007	6
2008	17
2009	11
2010	28
2011	6
2012	10
2013	12

All-Time Record Progression

7 new records

7 all-time records were set at Ahuehuepan between 1 June 1993 and 11 December 2010. Each dot is a new record.

When Ahuehuepan set new all-time records
Date	Kind	Detail
1993-06-01	Record high maximum temperature	Record high maximum temperature 47.2 C (117.0 F)
1993-06-03	Record high maximum temperature	Record high maximum temperature 47.8 C (118.0 F)
1993-06-04	Record high maximum temperature	Record high maximum temperature 48.3 C (118.9 F)
1993-06-05	Record high maximum temperature	Record high maximum temperature 48.9 C (120.0 F)
1998-02-03	Record low minimum temperature	Record low minimum temperature 4.4 C (39.9 F)
2001-08-06	Record daily precipitation	Record daily precipitation 100.1 mm (3.9 in)
2010-12-11	Record low minimum temperature	Record low minimum temperature 1.7 C (35.1 F)

Wettest Day of Each Month

Aug: 100.1 mm (3.9 in)

The wettest day on record for each calendar month at Ahuehuepan. The most was 100.1 mm (3.9 in) on 6 August 2001.

Record daily precipitation for each month at Ahuehuepan
Month	Record daily precipitation (mm)	Date
Jan	56.4 mm (2.2 in)	24 January 1980
Feb	47.0 mm (1.9 in)	3 February 2010
Mar	19.3 mm (0.8 in)	2 March 2001
Apr	24.4 mm (1.0 in)	3 April 1966
May	59.9 mm (2.4 in)	23 May 1968
Jun	89.9 mm (3.5 in)	29 June 1992
Jul	84.1 mm (3.3 in)	4 July 1991
Aug	100.1 mm (3.9 in)	6 August 2001
Sep	91.4 mm (3.6 in)	21 September 1962
Oct	64.8 mm (2.6 in)	4 October 1996
Nov	34.8 mm (1.4 in)	24 November 2007
Dec	39.4 mm (1.6 in)	9 December 1978

Period of Record Coverage

1960 to 2013

54 years of record at Ahuehuepan, 1960 to 2013. 10 years have data for under 90 percent of days and are left out of rankings: 1960, 1979, 1984, 1991, 1997, 2001, 2003, 2004 and others.

Days with data per year at Ahuehuepan
Year	Days with data	Share of year	Complete
1960	214	58%	No
1961	364	100%	Yes
1962	365	100%	Yes
1963	361	99%	Yes
1964	366	100%	Yes
1965	365	100%	Yes
1966	365	100%	Yes
1967	363	99%	Yes
1968	359	98%	Yes
1969	365	100%	Yes
1970	357	98%	Yes
1971	359	98%	Yes
1972	366	100%	Yes
1973	365	100%	Yes
1974	365	100%	Yes
1975	364	100%	Yes
1976	365	100%	Yes
1977	365	100%	Yes
1978	364	100%	Yes
1979	250	68%	No
1980	356	97%	Yes
1981	364	100%	Yes
1982	365	100%	Yes
1983	365	100%	Yes
1984	304	83%	No
1985	365	100%	Yes
1986	365	100%	Yes
1987	351	96%	Yes
1988	334	91%	Yes
1989	335	92%	Yes
1990	365	100%	Yes
1991	291	80%	No
1992	336	92%	Yes
1993	365	100%	Yes
1994	365	100%	Yes
1995	365	100%	Yes
1996	364	99%	Yes
1997	303	83%	No
1998	365	100%	Yes
1999	337	92%	Yes
2000	366	100%	Yes
2001	210	58%	No
2002	346	95%	Yes
2003	273	75%	No
2004	143	39%	No
2005	303	83%	No
2006	333	91%	Yes
2007	355	97%	Yes
2008	366	100%	Yes
2009	335	92%	Yes
2010	352	96%	Yes
2011	365	100%	Yes
2012	335	92%	Yes
2013	212	58%	No

Latest Records

Latest records at Ahuehuepan
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 May 2013	Ahuehuepan, MX	daily high max	40.6 C (105.1 F)	0.6 C (1.1 F)	47 years	21 of 100 (Routine)
9 May 2013	Ahuehuepan, MX	daily low min (Tie)	17.2 C (63.0 F)	tie	18 years	2 of 100 (Routine)
19 April 2013	Ahuehuepan, MX	daily high max	41.7 C (107.1 F)	0.6 C (1.1 F)	38 years	18 of 100 (Routine)
30 March 2013	Ahuehuepan, MX	daily high max (Tie)	40.0 C (104.0 F)	tie	39 years	4 of 100 (Routine)
15 March 2013	Ahuehuepan, MX	daily low max	30.0 C (86.0 F)	1.1 C (2.0 F)	47 years	23 of 100 (Routine)
15 March 2013	Ahuehuepan, MX	daily rain	3.3 mm (0.13 in)	3.3 mm (0.13 in)	52 years	20 of 100 (Routine)
5 March 2013	Ahuehuepan, MX	monthly low min (Tie)	8.9 C (48.0 F)	tie	15 years	4 of 100 (Routine)
2 March 2013	Ahuehuepan, MX	daily high min (Tie)	18.9 C (66.0 F)	tie	38 years	4 of 100 (Routine)
27 February 2013	Ahuehuepan, MX	monthly high max (Tie)	38.9 C (102.0 F)	tie	37 years	6 of 100 (Routine)
26 February 2013	Ahuehuepan, MX	daily high max	37.8 C (100.0 F)	0.6 C (1.1 F)	11 years	10 of 100 (Routine)
25 February 2013	Ahuehuepan, MX	daily high max	36.7 C (98.1 F)	0.6 C (1.1 F)	20 years	13 of 100 (Routine)
20 February 2013	Ahuehuepan, MX	daily high max	37.2 C (99.0 F)	0.5 C (0.9 F)	37 years	18 of 100 (Routine)
13 February 2013	Ahuehuepan, MX	daily high max (Tie)	36.7 C (98.1 F)	tie	39 years	4 of 100 (Routine)
10 February 2013	Ahuehuepan, MX	daily high max (Tie)	36.7 C (98.1 F)	tie	38 years	4 of 100 (Routine)
9 February 2013	Ahuehuepan, MX	daily high max	37.2 C (99.0 F)	0.5 C (0.9 F)	8 years	9 of 100 (Routine)
8 February 2013	Ahuehuepan, MX	daily high max	37.2 C (99.0 F)	0.5 C (0.9 F)	39 years	18 of 100 (Routine)
7 February 2013	Ahuehuepan, MX	daily high max	36.7 C (98.1 F)	0.6 C (1.1 F)	8 years	9 of 100 (Routine)
15 January 2013	Ahuehuepan, MX	daily high max	34.4 C (93.9 F)	0.5 C (0.9 F)	46 years	20 of 100 (Routine)
14 January 2013	Ahuehuepan, MX	daily high max (Tie)	35.0 C (95.0 F)	tie	39 years	4 of 100 (Routine)
11 January 2013	Ahuehuepan, MX	daily high max (Tie)	35.0 C (95.0 F)	tie	39 years	4 of 100 (Routine)

Climate Trend

35 complete years, 1961 to 2011

One stripe for each of 35 complete years at Ahuehuepan, 1961 to 2011. Blue stripes are years cooler than the station's own mean of 25.0 C (76.9 F); red stripes are warmer. The coolest year was 1971, at 23.6 C (74.4 F), and the warmest was 1974, at 27.5 C (81.6 F). The strongest colour marks a difference of 2.6 C (4.7 F).

Annual mean temperature at Ahuehuepan as warming stripes, 1961 to 2011
Year	Annual mean temperature	Difference from the station mean
1961	25.2 C	+0.21 C
1962	25.6 C	+0.67 C
1963	24.7 C	-0.22 C
1964	25.1 C	+0.15 C
1965	25.0 C	+0.01 C
1966	25.1 C	+0.16 C
1967	24.8 C	-0.20 C
1968	24.3 C	-0.63 C
1969	25.8 C	+0.87 C
1970	25.0 C	-0.01 C
1971	23.6 C	-1.39 C
1972	24.9 C	-0.11 C
1973	26.1 C	+1.18 C
1974	27.5 C	+2.57 C
1975	27.2 C	+2.21 C
1976	25.0 C	+0.02 C
1977	24.9 C	-0.10 C
1978	24.9 C	-0.08 C
1980	24.1 C	-0.84 C
1981	24.8 C	-0.14 C
1982	25.5 C	+0.55 C
1983	25.1 C	+0.11 C
1985	24.7 C	-0.28 C
1986	24.9 C	-0.06 C
1990	24.6 C	-0.33 C
1993	25.5 C	+0.58 C
1994	25.0 C	-0.01 C
1995	24.9 C	-0.10 C
1996	23.9 C	-1.05 C
1998	24.6 C	-0.41 C
2000	23.9 C	-1.11 C
2007	24.5 C	-0.49 C
2008	24.1 C	-0.91 C
2010	24.2 C	-0.77 C
2011	24.8 C	-0.13 C

The annual mean temperature here has fallen by 0.20 C (0.02 to 0.38) per decade over 1961 to 2011. In Fahrenheit: 0.35 F (0.03 to 0.68) per decade. The slope is a straight line fitted to 35 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Ahuehuepan
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	-0.20 C (-0.38 to -0.02) per decade	-0.35 F (-0.68 to -0.03) per decade	1961 to 2011	35	Fall
Mean daily maximum	0.2 C (-0.1 to 0.4) per decade	0.3 F (-0.1 to 0.7) per decade	1961 to 2011	35	Not clearly different from zero
Mean daily minimum	-0.5 C (-0.8 to -0.3) per decade	-1.0 F (-1.4 to -0.6) per decade	1961 to 2011	35	Fall

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

1960 to 2013

Yearly extremes at Ahuehuepan: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	48.9 C (120.0 F)	1993	40.0 C (104.0 F)	54
Coldest night (TNn)	1.7 C (35.1 F)	2010	8.3 C (46.9 F)	54
Wettest day (Rx1day)	100.1 mm (3.9 in)	2001	62.3 mm (2.5 in)	54
Wettest five days (Rx5day)	290.0 mm (11.4 in)	2001	111.5 mm (4.4 in)	54
Longest dry spell (CDD)	163 days	2005	96 days	54

Hottest day (TXx)

The hottest day of the year at Ahuehuepan, 1960 to 2013. The record is 48.9 C (120.0 F) in 1993, marked on the chart; the median year is 40.0 C (104.0 F).

Hottest day (TXx) at Ahuehuepan by year
Year	Hottest day (TXx)
1960	39.4 C (102.9 F)
1961	40.6 C (105.1 F)
1962	40.6 C (105.1 F)
1963	39.4 C (102.9 F)
1964	41.1 C (106.0 F)
1965	39.4 C (102.9 F)
1966	40.6 C (105.1 F)
1967	42.8 C (109.0 F)
1968	38.9 C (102.0 F)
1969	41.7 C (107.1 F)
1970	41.7 C (107.1 F)
1971	38.3 C (100.9 F)
1972	38.9 C (102.0 F)
1973	42.2 C (108.0 F)
1974	42.2 C (108.0 F)
1975	42.8 C (109.0 F)
1976	40.6 C (105.1 F)
1977	40.0 C (104.0 F)
1978	40.0 C (104.0 F)
1979	35.0 C (95.0 F)
1980	36.7 C (98.1 F)
1981	40.0 C (104.0 F)
1982	40.0 C (104.0 F)
1983	40.6 C (105.1 F)
1984	40.0 C (104.0 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	41.7 C (107.1 F)
1991	41.7 C (107.1 F)
1992	40.6 C (105.1 F)
1993	48.9 C (120.0 F)
1994	40.6 C (105.1 F)
1995	40.0 C (104.0 F)
1996	40.0 C (104.0 F)
1997	38.3 C (100.9 F)
1998	41.1 C (106.0 F)
1999	40.6 C (105.1 F)
2000	40.0 C (104.0 F)
2001	40.0 C (104.0 F)
2002	40.6 C (105.1 F)
2003	43.9 C (111.0 F)
2004	33.3 C (91.9 F)
2005	41.1 C (106.0 F)
2006	40.0 C (104.0 F)
2007	40.0 C (104.0 F)
2008	40.0 C (104.0 F)
2009	40.0 C (104.0 F)
2010	41.7 C (107.1 F)
2011	41.7 C (107.1 F)
2012	40.0 C (104.0 F)
2013	42.2 C (108.0 F)

Coldest night (TNn)

The coldest night of the year at Ahuehuepan, 1960 to 2013. The record is 1.7 C (35.1 F) in 2010, marked on the chart; the median year is 8.3 C (46.9 F).

Coldest night (TNn) at Ahuehuepan by year
Year	Coldest night (TNn)
1960	10.6 C (51.1 F)
1961	5.6 C (42.1 F)
1962	7.8 C (46.0 F)
1963	9.4 C (48.9 F)
1964	10.0 C (50.0 F)
1965	8.9 C (48.0 F)
1966	7.8 C (46.0 F)
1967	5.0 C (41.0 F)
1968	8.3 C (46.9 F)
1969	8.9 C (48.0 F)
1970	8.9 C (48.0 F)
1971	8.9 C (48.0 F)
1972	7.8 C (46.0 F)
1973	8.9 C (48.0 F)
1974	12.8 C (55.0 F)
1975	11.7 C (53.1 F)
1976	11.7 C (53.1 F)
1977	8.9 C (48.0 F)
1978	10.0 C (50.0 F)
1979	10.0 C (50.0 F)
1980	8.9 C (48.0 F)
1981	9.4 C (48.9 F)
1982	10.0 C (50.0 F)
1983	7.8 C (46.0 F)
1984	9.4 C (48.9 F)
1985	11.1 C (52.0 F)
1986	5.0 C (41.0 F)
1987	5.6 C (42.1 F)
1988	6.7 C (44.1 F)
1989	6.7 C (44.1 F)
1990	10.0 C (50.0 F)
1991	10.6 C (51.1 F)
1992	10.0 C (50.0 F)
1993	8.9 C (48.0 F)
1994	6.7 C (44.1 F)
1995	7.8 C (46.0 F)
1996	5.6 C (42.1 F)
1997	5.6 C (42.1 F)
1998	4.4 C (39.9 F)
1999	5.0 C (41.0 F)
2000	6.7 C (44.1 F)
2001	8.3 C (46.9 F)
2002	5.0 C (41.0 F)
2003	10.0 C (50.0 F)
2004	6.7 C (44.1 F)
2005	6.1 C (43.0 F)
2006	4.4 C (39.9 F)
2007	8.3 C (46.9 F)
2008	6.7 C (44.1 F)
2009	6.7 C (44.1 F)
2010	1.7 C (35.1 F)
2011	6.1 C (43.0 F)
2012	8.9 C (48.0 F)
2013	8.9 C (48.0 F)

Wettest day (Rx1day)

The wettest day of the year at Ahuehuepan, 1960 to 2013. The record is 100.1 mm (3.9 in) in 2001, marked on the chart; the median year is 62.3 mm (2.5 in).

Wettest day (Rx1day) at Ahuehuepan by year
Year	Wettest day (Rx1day)
1960	56.4 mm (2.2 in)
1961	44.2 mm (1.7 in)
1962	91.4 mm (3.6 in)
1963	39.9 mm (1.6 in)
1964	47.8 mm (1.9 in)
1965	62.5 mm (2.5 in)
1966	39.9 mm (1.6 in)
1967	78.0 mm (3.1 in)
1968	69.9 mm (2.8 in)
1969	59.9 mm (2.4 in)
1970	69.9 mm (2.8 in)
1971	39.9 mm (1.6 in)
1972	79.8 mm (3.1 in)
1973	53.1 mm (2.1 in)
1974	78.2 mm (3.1 in)
1975	54.9 mm (2.2 in)
1976	43.7 mm (1.7 in)
1977	63.5 mm (2.5 in)
1978	49.0 mm (1.9 in)
1979	47.8 mm (1.9 in)
1980	57.9 mm (2.3 in)
1981	68.8 mm (2.7 in)
1982	79.2 mm (3.1 in)
1983	67.8 mm (2.7 in)
1984	65.3 mm (2.6 in)
1985	48.5 mm (1.9 in)
1986	78.7 mm (3.1 in)
1987	76.2 mm (3.0 in)
1988	71.9 mm (2.8 in)
1989	53.3 mm (2.1 in)
1990	38.1 mm (1.5 in)
1991	84.1 mm (3.3 in)
1992	89.9 mm (3.5 in)
1993	36.8 mm (1.4 in)
1994	47.0 mm (1.9 in)
1995	62.0 mm (2.4 in)
1996	66.3 mm (2.6 in)
1997	84.8 mm (3.3 in)
1998	64.8 mm (2.6 in)
1999	58.4 mm (2.3 in)
2000	50.3 mm (2.0 in)
2001	100.1 mm (3.9 in)
2002	74.9 mm (2.9 in)
2003	90.7 mm (3.6 in)
2004	80.0 mm (3.1 in)
2005	37.6 mm (1.5 in)
2006	47.0 mm (1.9 in)
2007	79.8 mm (3.1 in)
2008	63.0 mm (2.5 in)
2009	38.9 mm (1.5 in)
2010	69.9 mm (2.8 in)
2011	48.3 mm (1.9 in)
2012	36.3 mm (1.4 in)
2013	37.3 mm (1.5 in)

Wettest five days (Rx5day)

The wettest five days of the year at Ahuehuepan, 1960 to 2013. The record is 290.0 mm (11.4 in) in 2001, marked on the chart; the median year is 111.5 mm (4.4 in).

Wettest five days (Rx5day) at Ahuehuepan by year
Year	Wettest five days (Rx5day)
1960	101.4 mm (4.0 in)
1961	92.3 mm (3.6 in)
1962	155.1 mm (6.1 in)
1963	96.3 mm (3.8 in)
1964	126.6 mm (5.0 in)
1965	129.6 mm (5.1 in)
1966	93.2 mm (3.7 in)
1967	181.5 mm (7.1 in)
1968	172.9 mm (6.8 in)
1969	149.4 mm (5.9 in)
1970	120.1 mm (4.7 in)
1971	74.5 mm (2.9 in)
1972	201.8 mm (7.9 in)
1973	116.4 mm (4.6 in)
1974	112.2 mm (4.4 in)
1975	82.0 mm (3.2 in)
1976	76.4 mm (3.0 in)
1977	133.2 mm (5.2 in)
1978	116.3 mm (4.6 in)
1979	97.2 mm (3.8 in)
1980	120.8 mm (4.8 in)
1981	126.8 mm (5.0 in)
1982	109.2 mm (4.3 in)
1983	98.9 mm (3.9 in)
1984	144.6 mm (5.7 in)
1985	101.3 mm (4.0 in)
1986	139.4 mm (5.5 in)
1987	108.8 mm (4.3 in)
1988	103.7 mm (4.1 in)
1989	90.1 mm (3.5 in)
1990	76.8 mm (3.0 in)
1991	152.8 mm (6.0 in)
1992	219.4 mm (8.6 in)
1993	94.0 mm (3.7 in)
1994	88.8 mm (3.5 in)
1995	93.0 mm (3.7 in)
1996	126.4 mm (5.0 in)
1997	98.0 mm (3.9 in)
1998	117.6 mm (4.6 in)
1999	104.7 mm (4.1 in)
2000	112.3 mm (4.4 in)
2001	290.0 mm (11.4 in)
2002	177.3 mm (7.0 in)
2003	143.2 mm (5.6 in)
2004	166.0 mm (6.5 in)
2005	94.7 mm (3.7 in)
2006	106.5 mm (4.2 in)
2007	110.8 mm (4.4 in)
2008	127.7 mm (5.0 in)
2009	65.3 mm (2.6 in)
2010	129.1 mm (5.1 in)
2011	76.7 mm (3.0 in)
2012	82.7 mm (3.3 in)
2013	98.1 mm (3.9 in)

Longest dry spell (CDD)

The longest dry spell of the year at Ahuehuepan, 1960 to 2013. The record is 163 days in 2005, marked on the chart; the median year is 96 days.

Longest dry spell (CDD) at Ahuehuepan by year
Year	Longest dry spell (CDD)
1960	64 days
1961	120 days
1962	101 days
1963	75 days
1964	129 days
1965	71 days
1966	68 days
1967	122 days
1968	129 days
1969	159 days
1970	151 days
1971	147 days
1972	106 days
1973	94 days
1974	74 days
1975	108 days
1976	90 days
1977	128 days
1978	43 days
1979	54 days
1980	99 days
1981	62 days
1982	73 days
1983	72 days
1984	119 days
1985	121 days
1986	112 days
1987	62 days
1988	81 days
1989	115 days
1990	110 days
1991	65 days
1992	69 days
1993	59 days
1994	108 days
1995	74 days
1996	114 days
1997	96 days
1998	155 days
1999	72 days
2000	83 days
2001	51 days
2002	83 days
2003	88 days
2004	47 days
2005	163 days
2006	122 days
2007	119 days
2008	118 days
2009	137 days
2010	96 days
2011	148 days
2012	76 days
2013	73 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

46 years, 1961 to 2012

A day with at least 59.2 mm (2.3 in) of rain is expected about once in 2 years. A day with at least 97.1 mm (3.8 in) of rain is expected about once in 100 years.

Rainfall return levels at Ahuehuepan: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	59.2 mm (2.3 in)
5 years	73.0 mm (2.9 in)
10 years	80.4 mm (3.2 in)
25 years	88.2 mm (3.5 in)
50 years	93.0 mm (3.7 in)	Longer than the 46 years of record
100 years	97.1 mm (3.8 in)	Longer than the 46 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, 46 years of values from 1961 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: 91.4 mm (3.6 in) in 1962; 89.9 mm (3.5 in) in 1992; 79.8 mm (3.1 in) in 1972.

Download the Data

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