Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Ahualulco. 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 Ahualulco, 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)
-2.2 C (28.0 F)
n/a
n/a
Feb
41.1 C (106.0 F)
0.6 C (33.1 F)
n/a
n/a
Mar
45.0 C (113.0 F)
0.6 C (33.1 F)
n/a
n/a
Apr
48.3 C (118.9 F)
4.4 C (39.9 F)
n/a
n/a
May
47.2 C (117.0 F)
11.1 C (52.0 F)
n/a
n/a
Jun
44.4 C (111.9 F)
15.0 C (59.0 F)
n/a
n/a
Jul
41.7 C (107.1 F)
16.1 C (61.0 F)
n/a
n/a
Aug
42.8 C (109.0 F)
16.1 C (61.0 F)
n/a
n/a
Sep
41.7 C (107.1 F)
11.1 C (52.0 F)
n/a
n/a
Oct
37.2 C (99.0 F)
6.1 C (43.0 F)
n/a
n/a
Nov
36.7 C (98.1 F)
1.7 C (35.1 F)
n/a
n/a
Dec
37.8 C (100.0 F)
-1.7 C (28.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Ahualulco still stand. 2012 holds the most, with 89.
Standing records at Ahualulco by the year they were set
Year set
Standing records
1961
32
1962
26
1963
21
1964
31
1965
25
1966
21
1967
30
1968
21
1969
33
1970
41
1971
32
1972
24
1973
38
1974
30
1975
28
1976
33
1977
25
1978
18
1979
30
1980
33
1981
25
1982
23
1983
22
1984
33
1985
20
1986
15
1987
22
1988
32
1989
46
1990
23
1991
44
1992
20
1993
20
1994
29
1995
33
1996
31
1997
43
1998
40
1999
22
2000
26
2001
10
2002
6
2003
23
2004
27
2005
21
2006
25
2007
21
2008
23
2009
21
2010
24
2011
33
2012
89
All-Time Record Progression
3 new records
3 all-time records were set at Ahualulco between 16 April 1998 and 5 October 2000. Each dot is a new record.
When Ahualulco set new all-time records
Date
Kind
Detail
1998-04-16
Record high maximum temperature
Record high maximum temperature 48.3 C (118.9 F)
1998-06-20
Record high minimum temperature
Record high minimum temperature 27.8 C (82.0 F)
2000-10-05
Record daily precipitation
Record daily precipitation 446.3 mm (17.6 in)
Wettest Day of Each Month
Oct: 446.3 mm (17.6 in)
The wettest day on record for each calendar month at Ahualulco. The most was 446.3 mm (17.6 in) on 5 October 2000.
Record daily precipitation for each month at Ahualulco
Month
Record daily precipitation (mm)
Date
Jan
47.8 mm (1.9 in)
21 January 1994
Feb
82.3 mm (3.2 in)
25 February 1983
Mar
137.2 mm (5.4 in)
26 March 1999
Apr
130.6 mm (5.1 in)
7 April 2012
May
115.3 mm (4.5 in)
4 May 1980
Jun
367.5 mm (14.5 in)
8 June 1972
Jul
247.4 mm (9.7 in)
20 July 2005
Aug
151.1 mm (5.9 in)
7 August 1989
Sep
210.6 mm (8.3 in)
20 September 1993
Oct
446.3 mm (17.6 in)
5 October 2000
Nov
130.6 mm (5.1 in)
5 November 1983
Dec
84.6 mm (3.3 in)
3 December 1979
Period of Record Coverage
1961 to 2012
Complete yearUnder 90 percent of days
52 years of record at Ahualulco, 1961 to 2012. 2 years have data for under 90 percent of days and are left out of rankings: 2001, 2002.
Cooler than the station meanWarmer than the station mean
One stripe for each of 47 complete years at Ahualulco, 1961 to 2012. Blue stripes are years cooler than the station's own mean of 24.6 C (76.3 F); red stripes are warmer. The coolest year was 1976, at 23.5 C (74.3 F), and the warmest was 1998, at 25.7 C (78.3 F). The strongest colour marks a difference of 1.2 C (2.2 F).
Annual mean temperature at Ahualulco as warming stripes, 1961 to 2012
Year
Annual mean temperature
Difference from the station mean
1961
24.5 C
-0.08 C
1962
25.1 C
+0.55 C
1963
24.6 C
-0.03 C
1964
24.6 C
+0.03 C
1965
24.7 C
+0.13 C
1966
23.6 C
-0.99 C
1967
24.5 C
-0.13 C
1968
23.9 C
-0.71 C
1969
24.6 C
+0.02 C
1970
24.0 C
-0.63 C
1971
25.3 C
+0.70 C
1972
25.0 C
+0.37 C
1973
24.5 C
-0.14 C
1974
24.5 C
-0.08 C
1975
24.6 C
+0.04 C
1976
23.5 C
-1.08 C
1977
24.5 C
-0.12 C
1978
24.4 C
-0.19 C
1979
24.1 C
-0.48 C
1980
24.6 C
-0.01 C
1981
24.6 C
-0.04 C
1982
24.9 C
+0.33 C
1983
24.5 C
-0.08 C
1984
24.1 C
-0.48 C
1985
24.3 C
-0.31 C
1986
24.7 C
+0.11 C
1987
24.0 C
-0.57 C
1988
24.3 C
-0.30 C
1989
24.4 C
-0.16 C
1990
24.8 C
+0.17 C
1991
24.8 C
+0.22 C
1992
23.9 C
-0.68 C
1993
24.4 C
-0.23 C
1994
24.8 C
+0.22 C
1995
25.2 C
+0.58 C
1996
24.6 C
-0.01 C
1997
24.3 C
-0.34 C
1998
25.7 C
+1.13 C
1999
24.8 C
+0.20 C
2000
24.9 C
+0.34 C
2003
24.4 C
-0.23 C
2005
25.1 C
+0.52 C
2006
25.5 C
+0.89 C
2008
24.9 C
+0.26 C
2010
24.2 C
-0.38 C
2011
25.5 C
+0.89 C
2012
25.3 C
+0.74 C
The annual mean temperature here has risen by 0.12 C (0.03 to 0.21) per decade over 1961 to 2012. In Fahrenheit: 0.21 F (0.05 to 0.37) per decade. The slope is a straight line fitted to 47 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Ahualulco
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.12 C (0.03 to 0.21) per decade
0.21 F (0.05 to 0.37) per decade
1961 to 2012
47
Rise
Mean daily maximum
0.15 C (0.02 to 0.29) per decade
0.28 F (0.04 to 0.52) per decade
1961 to 2012
47
Rise
Mean daily minimum
0.08 C (-0.01 to 0.18) per decade
0.15 F (-0.02 to 0.32) per decade
1961 to 2012
47
Not clearly different from zero
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
1961 to 2012
Yearly extremes at Ahualulco: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
48.3 C (118.9 F)
1998
41.7 C (107.1 F)
52
Coldest night (TNn)
-2.2 C (28.0 F)
1975
2.2 C (36.0 F)
52
Wettest day (Rx1day)
446.3 mm (17.6 in)
2000
140.8 mm (5.5 in)
52
Wettest five days (Rx5day)
808.5 mm (31.8 in)
1976
265.9 mm (10.5 in)
52
Longest dry spell (CDD)
77 days
1995
38 days
52
Hottest day (TXx)
The hottest day of the year at Ahualulco, 1961 to 2012. The record is 48.3 C (118.9 F) in 1998, marked on the chart; the median year is 41.7 C (107.1 F).
Hottest day (TXx) at Ahualulco by year
Year
Hottest day (TXx)
1961
42.2 C (108.0 F)
1962
42.2 C (108.0 F)
1963
40.6 C (105.1 F)
1964
43.9 C (111.0 F)
1965
42.8 C (109.0 F)
1966
39.4 C (102.9 F)
1967
43.9 C (111.0 F)
1968
38.9 C (102.0 F)
1969
41.1 C (106.0 F)
1970
40.0 C (104.0 F)
1971
45.0 C (113.0 F)
1972
40.0 C (104.0 F)
1973
47.2 C (117.0 F)
1974
44.4 C (111.9 F)
1975
43.9 C (111.0 F)
1976
40.0 C (104.0 F)
1977
44.4 C (111.9 F)
1978
47.2 C (117.0 F)
1979
44.4 C (111.9 F)
1980
41.1 C (106.0 F)
1981
39.4 C (102.9 F)
1982
41.7 C (107.1 F)
1983
41.7 C (107.1 F)
1984
46.7 C (116.1 F)
1985
38.3 C (100.9 F)
1986
40.0 C (104.0 F)
1987
40.0 C (104.0 F)
1988
41.7 C (107.1 F)
1989
40.6 C (105.1 F)
1990
41.1 C (106.0 F)
1991
45.6 C (114.1 F)
1992
40.0 C (104.0 F)
1993
40.0 C (104.0 F)
1994
40.0 C (104.0 F)
1995
45.0 C (113.0 F)
1996
40.6 C (105.1 F)
1997
40.0 C (104.0 F)
1998
48.3 C (118.9 F)
1999
45.6 C (114.1 F)
2000
41.7 C (107.1 F)
2001
37.8 C (100.0 F)
2002
37.2 C (99.0 F)
2003
41.1 C (106.0 F)
2004
40.0 C (104.0 F)
2005
41.7 C (107.1 F)
2006
40.6 C (105.1 F)
2007
38.9 C (102.0 F)
2008
41.7 C (107.1 F)
2009
42.2 C (108.0 F)
2010
43.9 C (111.0 F)
2011
45.6 C (114.1 F)
2012
42.8 C (109.0 F)
Coldest night (TNn)
The coldest night of the year at Ahualulco, 1961 to 2012. The record is -2.2 C (28.0 F) in 1975, marked on the chart; the median year is 2.2 C (36.0 F).
Coldest night (TNn) at Ahualulco by year
Year
Coldest night (TNn)
1961
3.9 C (39.0 F)
1962
-1.1 C (30.0 F)
1963
1.1 C (34.0 F)
1964
1.7 C (35.1 F)
1965
1.7 C (35.1 F)
1966
0.6 C (33.1 F)
1967
0.0 C (32.0 F)
1968
2.2 C (36.0 F)
1969
2.8 C (37.0 F)
1970
2.8 C (37.0 F)
1971
1.7 C (35.1 F)
1972
5.0 C (41.0 F)
1973
0.0 C (32.0 F)
1974
1.7 C (35.1 F)
1975
-2.2 C (28.0 F)
1976
0.0 C (32.0 F)
1977
1.1 C (34.0 F)
1978
5.0 C (41.0 F)
1979
2.2 C (36.0 F)
1980
0.6 C (33.1 F)
1981
5.0 C (41.0 F)
1982
0.6 C (33.1 F)
1983
-1.7 C (28.9 F)
1984
4.4 C (39.9 F)
1985
2.2 C (36.0 F)
1986
0.0 C (32.0 F)
1987
2.8 C (37.0 F)
1988
2.2 C (36.0 F)
1989
-1.1 C (30.0 F)
1990
2.8 C (37.0 F)
1991
6.7 C (44.1 F)
1992
2.8 C (37.0 F)
1993
2.8 C (37.0 F)
1994
2.2 C (36.0 F)
1995
5.0 C (41.0 F)
1996
1.1 C (34.0 F)
1997
-1.1 C (30.0 F)
1998
5.6 C (42.1 F)
1999
1.7 C (35.1 F)
2000
2.2 C (36.0 F)
2001
3.3 C (37.9 F)
2002
7.2 C (45.0 F)
2003
0.6 C (33.1 F)
2004
0.6 C (33.1 F)
2005
6.1 C (43.0 F)
2006
2.2 C (36.0 F)
2007
5.0 C (41.0 F)
2008
4.4 C (39.9 F)
2009
5.0 C (41.0 F)
2010
3.3 C (37.9 F)
2011
1.1 C (34.0 F)
2012
4.4 C (39.9 F)
Wettest day (Rx1day)
The wettest day of the year at Ahualulco, 1961 to 2012. The record is 446.3 mm (17.6 in) in 2000, marked on the chart; the median year is 140.8 mm (5.5 in).
Wettest day (Rx1day) at Ahualulco by year
Year
Wettest day (Rx1day)
1961
126.0 mm (5.0 in)
1962
226.3 mm (8.9 in)
1963
70.4 mm (2.8 in)
1964
119.4 mm (4.7 in)
1965
87.9 mm (3.5 in)
1966
174.0 mm (6.9 in)
1967
153.2 mm (6.0 in)
1968
200.2 mm (7.9 in)
1969
173.5 mm (6.8 in)
1970
198.6 mm (7.8 in)
1971
158.2 mm (6.2 in)
1972
367.5 mm (14.5 in)
1973
113.3 mm (4.5 in)
1974
106.4 mm (4.2 in)
1975
140.0 mm (5.5 in)
1976
222.0 mm (8.7 in)
1977
152.4 mm (6.0 in)
1978
134.1 mm (5.3 in)
1979
141.7 mm (5.6 in)
1980
115.3 mm (4.5 in)
1981
95.3 mm (3.8 in)
1982
129.8 mm (5.1 in)
1983
130.6 mm (5.1 in)
1984
158.8 mm (6.3 in)
1985
143.3 mm (5.6 in)
1986
136.7 mm (5.4 in)
1987
220.0 mm (8.7 in)
1988
81.3 mm (3.2 in)
1989
151.1 mm (5.9 in)
1990
63.8 mm (2.5 in)
1991
124.5 mm (4.9 in)
1992
153.9 mm (6.1 in)
1993
210.6 mm (8.3 in)
1994
194.8 mm (7.7 in)
1995
100.8 mm (4.0 in)
1996
136.1 mm (5.4 in)
1997
241.6 mm (9.5 in)
1998
111.0 mm (4.4 in)
1999
186.9 mm (7.4 in)
2000
446.3 mm (17.6 in)
2001
59.9 mm (2.4 in)
2002
108.0 mm (4.3 in)
2003
96.8 mm (3.8 in)
2004
175.3 mm (6.9 in)
2005
247.4 mm (9.7 in)
2006
73.9 mm (2.9 in)
2007
142.0 mm (5.6 in)
2008
141.5 mm (5.6 in)
2009
63.0 mm (2.5 in)
2010
222.8 mm (8.8 in)
2011
67.8 mm (2.7 in)
2012
130.6 mm (5.1 in)
Wettest five days (Rx5day)
The wettest five days of the year at Ahualulco, 1961 to 2012. The record is 808.5 mm (31.8 in) in 1976, marked on the chart; the median year is 265.9 mm (10.5 in).
Wettest five days (Rx5day) at Ahualulco by year
Year
Wettest five days (Rx5day)
1961
389.4 mm (15.3 in)
1962
257.3 mm (10.1 in)
1963
92.5 mm (3.6 in)
1964
283.2 mm (11.1 in)
1965
270.1 mm (10.6 in)
1966
367.1 mm (14.5 in)
1967
312.5 mm (12.3 in)
1968
322.4 mm (12.7 in)
1969
225.3 mm (8.9 in)
1970
375.0 mm (14.8 in)
1971
230.9 mm (9.1 in)
1972
441.2 mm (17.4 in)
1973
258.1 mm (10.2 in)
1974
149.0 mm (5.9 in)
1975
269.0 mm (10.6 in)
1976
808.5 mm (31.8 in)
1977
267.8 mm (10.5 in)
1978
298.1 mm (11.7 in)
1979
232.1 mm (9.1 in)
1980
160.1 mm (6.3 in)
1981
198.0 mm (7.8 in)
1982
243.1 mm (9.6 in)
1983
215.6 mm (8.5 in)
1984
198.5 mm (7.8 in)
1985
307.4 mm (12.1 in)
1986
263.9 mm (10.4 in)
1987
290.6 mm (11.4 in)
1988
244.3 mm (9.6 in)
1989
211.4 mm (8.3 in)
1990
134.5 mm (5.3 in)
1991
270.3 mm (10.6 in)
1992
354.4 mm (14.0 in)
1993
306.9 mm (12.1 in)
1994
332.7 mm (13.1 in)
1995
148.8 mm (5.9 in)
1996
176.0 mm (6.9 in)
1997
360.8 mm (14.2 in)
1998
177.1 mm (7.0 in)
1999
360.0 mm (14.2 in)
2000
494.0 mm (19.4 in)
2001
76.9 mm (3.0 in)
2002
170.0 mm (6.7 in)
2003
145.3 mm (5.7 in)
2004
387.4 mm (15.3 in)
2005
386.8 mm (15.2 in)
2006
150.3 mm (5.9 in)
2007
291.6 mm (11.5 in)
2008
456.5 mm (18.0 in)
2009
157.5 mm (6.2 in)
2010
347.8 mm (13.7 in)
2011
167.4 mm (6.6 in)
2012
175.4 mm (6.9 in)
Longest dry spell (CDD)
The longest dry spell of the year at Ahualulco, 1961 to 2012. The record is 77 days in 1995, marked on the chart; the median year is 38 days.
Longest dry spell (CDD) at Ahualulco by year
Year
Longest dry spell (CDD)
1961
48 days
1962
48 days
1963
31 days
1964
36 days
1965
34 days
1966
47 days
1967
43 days
1968
28 days
1969
27 days
1970
55 days
1971
69 days
1972
21 days
1973
36 days
1974
34 days
1975
40 days
1976
38 days
1977
49 days
1978
44 days
1979
73 days
1980
21 days
1981
45 days
1982
29 days
1983
22 days
1984
29 days
1985
32 days
1986
46 days
1987
20 days
1988
34 days
1989
56 days
1990
37 days
1991
48 days
1992
18 days
1993
31 days
1994
23 days
1995
77 days
1996
42 days
1997
47 days
1998
38 days
1999
55 days
2000
32 days
2001
28 days
2002
32 days
2003
57 days
2004
40 days
2005
42 days
2006
60 days
2007
29 days
2008
52 days
2009
30 days
2010
69 days
2011
54 days
2012
38 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
52 years, 1961 to 2012
A day with at least 137.9 mm (5.4 in) of rain is expected about once in 2 years. A day with at least 393.5 mm (15.5 in) of rain is expected about once in 100 years.
Rainfall return levels at Ahualulco: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
137.9 mm (5.4 in)
5 years
196.9 mm (7.8 in)
10 years
239.5 mm (9.4 in)
25 years
297.6 mm (11.7 in)
50 years
344.2 mm (13.6 in)
100 years
393.5 mm (15.5 in)
Longer than the 52 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, 52 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: 446.3 mm (17.6 in) in 2000; 367.5 mm (14.5 in) in 1972; 247.4 mm (9.7 in) in 2005.
Station Changes
2 suspected
2 changes were suspected in the annual mean temperature of Ahualulco, at 1966 and 1996. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1966 ran 0.4 C (0.7 F) higher than in the years before (possible change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1996 ran 0.3 C (0.5 F) lower than in the years before (likely change).
Suspected changes in the annual mean temperature at Ahualulco, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1966
+0.4
+0.7
possible
5
1996
-0.3
-0.5
likely
5
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Download the Data
Data for Ahualulco standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Ahualulco 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.