Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Ahuacatlan. 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 Ahuacatlan, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
38.3 C (100.9 F)
-1.1 C (30.0 F)
n/a
n/a
Feb
40.6 C (105.1 F)
0.6 C (33.1 F)
n/a
n/a
Mar
41.1 C (106.0 F)
0.6 C (33.1 F)
n/a
n/a
Apr
42.8 C (109.0 F)
0.6 C (33.1 F)
n/a
n/a
May
42.2 C (108.0 F)
5.6 C (42.1 F)
n/a
n/a
Jun
42.8 C (109.0 F)
9.4 C (48.9 F)
n/a
n/a
Jul
40.6 C (105.1 F)
12.8 C (55.0 F)
n/a
n/a
Aug
40.6 C (105.1 F)
11.7 C (53.1 F)
n/a
n/a
Sep
40.0 C (104.0 F)
7.8 C (46.0 F)
n/a
n/a
Oct
41.7 C (107.1 F)
5.6 C (42.1 F)
n/a
n/a
Nov
40.0 C (104.0 F)
2.8 C (37.0 F)
n/a
n/a
Dec
37.8 C (100.0 F)
0.0 C (32.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Ahuacatlan still stand. 1942 holds the most, with 133.
Standing records at Ahuacatlan by the year they were set
Year set
Standing records
1924
11
1925
28
1926
32
1927
25
1928
15
1929
22
1930
17
1931
22
1932
21
1933
22
1934
31
1935
15
1936
17
1937
14
1938
19
1939
14
1940
28
1941
48
1942
133
1943
56
1944
52
1945
50
1946
65
1947
21
1948
17
1949
12
1950
7
1951
19
1952
7
1953
10
1954
5
1955
6
1956
6
1957
15
1958
10
1959
6
1960
5
1961
10
1962
2
1963
10
1964
8
1965
6
1966
23
1967
6
1968
9
1969
7
1970
11
1971
6
1972
5
1973
14
1974
4
1975
8
1976
8
1977
3
1978
10
1979
7
1980
24
1981
34
1982
10
1983
20
1984
5
1985
10
1986
15
1987
16
1988
15
1989
6
1990
2
1991
15
1992
11
1993
10
1994
5
1995
6
1996
9
1997
16
1998
12
1999
17
2000
2
2001
6
2002
6
2003
18
2004
12
2005
22
2006
2
2007
8
2008
9
2009
13
2010
18
2011
6
2012
17
2013
7
All-Time Record Progression
4 new records
4 all-time records were set at Ahuacatlan between 24 September 1955 and 2 January 2011. Each dot is a new record.
When Ahuacatlan set new all-time records
Date
Kind
Detail
1955-09-24
Record daily precipitation
Record daily precipitation 125.5 mm (4.9 in)
1987-01-12
Record low maximum temperature
Record low maximum temperature 13.9 C (57.0 F)
2002-07-21
Record daily precipitation
Record daily precipitation 158.0 mm (6.2 in)
2011-01-02
Record low minimum temperature
Record low minimum temperature -1.1 C (30.0 F)
Wettest Day of Each Month
Jul: 158.0 mm (6.2 in)
The wettest day on record for each calendar month at Ahuacatlan. The most was 158.0 mm (6.2 in) on 21 July 2002.
Record daily precipitation for each month at Ahuacatlan
Month
Record daily precipitation (mm)
Date
Jan
50.8 mm (2.0 in)
22 January 1961
Feb
48.8 mm (1.9 in)
25 February 1987
Mar
63.8 mm (2.5 in)
4 March 1968
Apr
47.8 mm (1.9 in)
13 April 1959
May
56.9 mm (2.2 in)
19 May 2009
Jun
84.8 mm (3.3 in)
2 June 1952
Jul
158.0 mm (6.2 in)
21 July 2002
Aug
117.9 mm (4.6 in)
4 August 1935
Sep
125.5 mm (4.9 in)
24 September 1955
Oct
86.9 mm (3.4 in)
16 October 1934
Nov
47.0 mm (1.9 in)
15 November 2013
Dec
55.9 mm (2.2 in)
31 December 2009
Period of Record Coverage
1924 to 2013
Complete yearUnder 90 percent of days
90 years of record at Ahuacatlan, 1924 to 2013. 9 years have data for under 90 percent of days and are left out of rankings: 1924, 1925, 1926, 1990, 1995, 1998, 2000, 2012 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 77 complete years at Ahuacatlan, 1927 to 2010. Blue stripes are years cooler than the station's own mean of 22.8 C (73.0 F); red stripes are warmer. The coolest year was 2010, at 21.0 C (69.9 F), and the warmest was 1942, at 25.8 C (78.4 F). The strongest colour marks a difference of 3.0 C (5.4 F).
Annual mean temperature at Ahuacatlan as warming stripes, 1927 to 2010
Year
Annual mean temperature
Difference from the station mean
1927
21.9 C
-0.89 C
1928
22.2 C
-0.58 C
1929
21.8 C
-0.97 C
1930
22.1 C
-0.73 C
1931
21.7 C
-1.08 C
1932
21.7 C
-1.05 C
1933
21.7 C
-1.09 C
1934
21.7 C
-1.06 C
1935
21.5 C
-1.33 C
1936
21.7 C
-1.07 C
1937
21.9 C
-0.87 C
1938
21.7 C
-1.06 C
1939
21.5 C
-1.27 C
1940
22.0 C
-0.77 C
1941
22.9 C
+0.15 C
1942
25.8 C
+2.97 C
1943
25.1 C
+2.35 C
1944
24.8 C
+1.97 C
1945
25.2 C
+2.43 C
1946
25.1 C
+2.30 C
1947
24.2 C
+1.39 C
1948
24.4 C
+1.63 C
1949
23.8 C
+1.01 C
1950
24.0 C
+1.19 C
1951
23.7 C
+0.92 C
1952
23.5 C
+0.74 C
1953
23.4 C
+0.58 C
1954
23.7 C
+0.96 C
1955
22.9 C
+0.15 C
1956
23.2 C
+0.41 C
1957
23.3 C
+0.55 C
1958
23.2 C
+0.40 C
1959
23.2 C
+0.46 C
1960
23.1 C
+0.28 C
1961
23.0 C
+0.26 C
1962
23.0 C
+0.19 C
1963
23.7 C
+0.92 C
1964
23.5 C
+0.69 C
1965
23.5 C
+0.71 C
1966
23.6 C
+0.82 C
1967
23.1 C
+0.32 C
1968
23.0 C
+0.21 C
1969
23.2 C
+0.45 C
1970
23.2 C
+0.38 C
1971
23.1 C
+0.33 C
1972
23.8 C
+1.03 C
1973
23.2 C
+0.46 C
1974
23.8 C
+1.01 C
1975
23.3 C
+0.56 C
1976
23.7 C
+0.94 C
1977
23.9 C
+1.12 C
1978
23.9 C
+1.07 C
1979
24.0 C
+1.23 C
1980
23.7 C
+0.93 C
1983
23.6 C
+0.78 C
1984
22.8 C
+0.04 C
1985
21.9 C
-0.93 C
1986
21.4 C
-1.39 C
1987
21.3 C
-1.49 C
1988
21.6 C
-1.20 C
1989
21.5 C
-1.26 C
1991
21.5 C
-1.31 C
1992
21.4 C
-1.39 C
1993
21.8 C
-1.01 C
1996
21.7 C
-1.05 C
1997
21.6 C
-1.17 C
1999
21.5 C
-1.30 C
2001
21.7 C
-1.05 C
2002
22.0 C
-0.81 C
2003
21.4 C
-1.35 C
2004
21.4 C
-1.43 C
2005
22.0 C
-0.76 C
2006
22.1 C
-0.64 C
2007
22.0 C
-0.77 C
2008
21.8 C
-0.98 C
2009
22.6 C
-0.16 C
2010
21.0 C
-1.74 C
The annual mean temperature here has fallen by 0.13 C (0.03 to 0.23) per decade over 1927 to 2010. In Fahrenheit: 0.2 F (0.1 to 0.4) per decade. The slope is a straight line fitted to 77 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Ahuacatlan
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.13 C (-0.23 to -0.03) per decade
-0.2 F (-0.4 to -0.1) per decade
1927 to 2010
77
Fall
Mean daily maximum
-0.2 C (-0.3 to -0.1) per decade
-0.4 F (-0.5 to -0.2) per decade
1927 to 2010
77
Fall
Mean daily minimum
-0.1 C (-0.2 to 0.1) per decade
-0.1 F (-0.4 to 0.1) per decade
1927 to 2010
77
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
1924 to 2013
Yearly extremes at Ahuacatlan: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
42.8 C (109.0 F)
1946
37.8 C (100.0 F)
90
Coldest night (TNn)
-1.1 C (30.0 F)
2011
3.9 C (39.0 F)
89
Wettest day (Rx1day)
158.0 mm (6.2 in)
2002
55.4 mm (2.2 in)
90
Wettest five days (Rx5day)
233.7 mm (9.2 in)
2004
112.9 mm (4.4 in)
90
Longest dry spell (CDD)
165 days
1989
73 days
90
Hottest day (TXx)
The hottest day of the year at Ahuacatlan, 1924 to 2013. The record is 42.8 C (109.0 F) in 1946, marked on the chart; the median year is 37.8 C (100.0 F).
Hottest day (TXx) at Ahuacatlan by year
Year
Hottest day (TXx)
1924
36.7 C (98.1 F)
1925
39.4 C (102.9 F)
1926
36.7 C (98.1 F)
1927
40.6 C (105.1 F)
1928
40.0 C (104.0 F)
1929
39.4 C (102.9 F)
1930
38.3 C (100.9 F)
1931
36.7 C (98.1 F)
1932
40.0 C (104.0 F)
1933
38.3 C (100.9 F)
1934
36.7 C (98.1 F)
1935
36.7 C (98.1 F)
1936
37.2 C (99.0 F)
1937
37.2 C (99.0 F)
1938
37.8 C (100.0 F)
1939
37.8 C (100.0 F)
1940
40.0 C (104.0 F)
1941
40.0 C (104.0 F)
1942
41.7 C (107.1 F)
1943
40.6 C (105.1 F)
1944
42.2 C (108.0 F)
1945
40.6 C (105.1 F)
1946
42.8 C (109.0 F)
1947
38.9 C (102.0 F)
1948
40.0 C (104.0 F)
1949
38.9 C (102.0 F)
1950
39.4 C (102.9 F)
1951
40.0 C (104.0 F)
1952
38.9 C (102.0 F)
1953
40.6 C (105.1 F)
1954
38.3 C (100.9 F)
1955
40.0 C (104.0 F)
1956
40.6 C (105.1 F)
1957
37.8 C (100.0 F)
1958
38.9 C (102.0 F)
1959
36.7 C (98.1 F)
1960
39.4 C (102.9 F)
1961
38.9 C (102.0 F)
1962
37.2 C (99.0 F)
1963
39.4 C (102.9 F)
1964
40.6 C (105.1 F)
1965
40.0 C (104.0 F)
1966
37.2 C (99.0 F)
1967
37.2 C (99.0 F)
1968
36.7 C (98.1 F)
1969
37.8 C (100.0 F)
1970
37.2 C (99.0 F)
1971
37.2 C (99.0 F)
1972
37.8 C (100.0 F)
1973
38.9 C (102.0 F)
1974
37.8 C (100.0 F)
1975
40.0 C (104.0 F)
1976
37.8 C (100.0 F)
1977
37.2 C (99.0 F)
1978
37.8 C (100.0 F)
1979
40.0 C (104.0 F)
1980
37.8 C (100.0 F)
1981
37.2 C (99.0 F)
1982
36.7 C (98.1 F)
1983
37.8 C (100.0 F)
1984
35.6 C (96.1 F)
1985
37.8 C (100.0 F)
1986
37.8 C (100.0 F)
1987
37.8 C (100.0 F)
1988
38.9 C (102.0 F)
1989
38.9 C (102.0 F)
1990
31.7 C (89.1 F)
1991
37.8 C (100.0 F)
1992
38.3 C (100.9 F)
1993
40.0 C (104.0 F)
1994
40.0 C (104.0 F)
1995
37.8 C (100.0 F)
1996
40.0 C (104.0 F)
1997
37.8 C (100.0 F)
1998
40.0 C (104.0 F)
1999
37.8 C (100.0 F)
2000
40.0 C (104.0 F)
2001
38.9 C (102.0 F)
2002
37.8 C (100.0 F)
2003
37.8 C (100.0 F)
2004
35.6 C (96.1 F)
2005
37.8 C (100.0 F)
2006
35.6 C (96.1 F)
2007
35.6 C (96.1 F)
2008
35.6 C (96.1 F)
2009
36.7 C (98.1 F)
2010
36.7 C (98.1 F)
2011
35.6 C (96.1 F)
2012
42.8 C (109.0 F)
2013
38.9 C (102.0 F)
Coldest night (TNn)
The coldest night of the year at Ahuacatlan, 1924 to 2013. The record is -1.1 C (30.0 F) in 2011, marked on the chart; the median year is 3.9 C (39.0 F).
Coldest night (TNn) at Ahuacatlan by year
Year
Coldest night (TNn)
1924
3.9 C (39.0 F)
1925
3.3 C (37.9 F)
1926
2.8 C (37.0 F)
1927
5.0 C (41.0 F)
1928
3.9 C (39.0 F)
1929
0.6 C (33.1 F)
1930
2.2 C (36.0 F)
1931
0.0 C (32.0 F)
1932
2.8 C (37.0 F)
1933
3.9 C (39.0 F)
1934
2.8 C (37.0 F)
1935
0.6 C (33.1 F)
1936
0.6 C (33.1 F)
1937
2.8 C (37.0 F)
1938
2.2 C (36.0 F)
1939
1.7 C (35.1 F)
1940
0.6 C (33.1 F)
1941
1.7 C (35.1 F)
1942
5.0 C (41.0 F)
1943
6.1 C (43.0 F)
1944
6.7 C (44.1 F)
1945
6.7 C (44.1 F)
1946
5.6 C (42.1 F)
1947
5.6 C (42.1 F)
1948
5.0 C (41.0 F)
1949
6.7 C (44.1 F)
1950
3.9 C (39.0 F)
1951
4.4 C (39.9 F)
1952
3.3 C (37.9 F)
1953
4.4 C (39.9 F)
1954
5.6 C (42.1 F)
1955
1.1 C (34.0 F)
1956
2.8 C (37.0 F)
1957
2.8 C (37.0 F)
1958
4.4 C (39.9 F)
1959
4.4 C (39.9 F)
1960
2.2 C (36.0 F)
1961
4.4 C (39.9 F)
1962
4.4 C (39.9 F)
1963
5.0 C (41.0 F)
1964
6.1 C (43.0 F)
1965
6.1 C (43.0 F)
1966
6.1 C (43.0 F)
1967
3.9 C (39.0 F)
1968
5.0 C (41.0 F)
1969
5.0 C (41.0 F)
1970
5.0 C (41.0 F)
1971
1.7 C (35.1 F)
1972
5.6 C (42.1 F)
1973
5.0 C (41.0 F)
1974
3.3 C (37.9 F)
1975
5.0 C (41.0 F)
1976
5.0 C (41.0 F)
1977
5.0 C (41.0 F)
1978
5.0 C (41.0 F)
1979
5.0 C (41.0 F)
1980
7.8 C (46.0 F)
1981
8.9 C (48.0 F)
1982
7.8 C (46.0 F)
1983
5.0 C (41.0 F)
1984
5.6 C (42.1 F)
1985
4.4 C (39.9 F)
1986
1.7 C (35.1 F)
1987
0.6 C (33.1 F)
1988
0.0 C (32.0 F)
1989
3.9 C (39.0 F)
1990
0.6 C (33.1 F)
1991
0.6 C (33.1 F)
1992
1.7 C (35.1 F)
1993
1.7 C (35.1 F)
1994
3.9 C (39.0 F)
1995
3.3 C (37.9 F)
1996
3.9 C (39.0 F)
1997
1.7 C (35.1 F)
1998
0.6 C (33.1 F)
1999
1.7 C (35.1 F)
2000
1.7 C (35.1 F)
2001
1.7 C (35.1 F)
2002
1.7 C (35.1 F)
2003
1.7 C (35.1 F)
2004
2.8 C (37.0 F)
2005
1.7 C (35.1 F)
2006
1.7 C (35.1 F)
2007
2.8 C (37.0 F)
2008
1.7 C (35.1 F)
2009
2.8 C (37.0 F)
2010
1.7 C (35.1 F)
2011
-1.1 C (30.0 F)
2012
5.0 C (41.0 F)
2013
n/a
Wettest day (Rx1day)
The wettest day of the year at Ahuacatlan, 1924 to 2013. The record is 158.0 mm (6.2 in) in 2002, marked on the chart; the median year is 55.4 mm (2.2 in).
Wettest day (Rx1day) at Ahuacatlan by year
Year
Wettest day (Rx1day)
1924
46.2 mm (1.8 in)
1925
52.3 mm (2.1 in)
1926
57.7 mm (2.3 in)
1927
54.9 mm (2.2 in)
1928
38.4 mm (1.5 in)
1929
48.8 mm (1.9 in)
1930
44.5 mm (1.8 in)
1931
47.0 mm (1.9 in)
1932
40.9 mm (1.6 in)
1933
52.8 mm (2.1 in)
1934
86.9 mm (3.4 in)
1935
117.9 mm (4.6 in)
1936
47.0 mm (1.9 in)
1937
43.9 mm (1.7 in)
1938
78.0 mm (3.1 in)
1939
51.8 mm (2.0 in)
1940
46.0 mm (1.8 in)
1941
47.8 mm (1.9 in)
1942
61.0 mm (2.4 in)
1943
59.9 mm (2.4 in)
1944
53.8 mm (2.1 in)
1945
37.8 mm (1.5 in)
1946
47.5 mm (1.9 in)
1947
62.0 mm (2.4 in)
1948
39.9 mm (1.6 in)
1949
74.9 mm (2.9 in)
1950
54.9 mm (2.2 in)
1951
54.9 mm (2.2 in)
1952
84.8 mm (3.3 in)
1953
61.0 mm (2.4 in)
1954
62.0 mm (2.4 in)
1955
125.5 mm (4.9 in)
1956
47.8 mm (1.9 in)
1957
47.8 mm (1.9 in)
1958
55.9 mm (2.2 in)
1959
63.0 mm (2.5 in)
1960
80.8 mm (3.2 in)
1961
50.8 mm (2.0 in)
1962
56.9 mm (2.2 in)
1963
66.8 mm (2.6 in)
1964
36.8 mm (1.4 in)
1965
48.8 mm (1.9 in)
1966
51.8 mm (2.0 in)
1967
65.8 mm (2.6 in)
1968
63.8 mm (2.5 in)
1969
35.8 mm (1.4 in)
1970
51.8 mm (2.0 in)
1971
56.9 mm (2.2 in)
1972
62.0 mm (2.4 in)
1973
51.8 mm (2.0 in)
1974
63.8 mm (2.5 in)
1975
64.8 mm (2.6 in)
1976
35.3 mm (1.4 in)
1977
42.4 mm (1.7 in)
1978
34.3 mm (1.4 in)
1979
62.0 mm (2.4 in)
1980
54.9 mm (2.2 in)
1981
47.8 mm (1.9 in)
1982
62.0 mm (2.4 in)
1983
50.8 mm (2.0 in)
1984
73.9 mm (2.9 in)
1985
79.8 mm (3.1 in)
1986
69.9 mm (2.8 in)
1987
59.9 mm (2.4 in)
1988
85.9 mm (3.4 in)
1989
46.0 mm (1.8 in)
1990
30.0 mm (1.2 in)
1991
89.9 mm (3.5 in)
1992
49.8 mm (2.0 in)
1993
45.0 mm (1.8 in)
1994
59.9 mm (2.4 in)
1995
46.0 mm (1.8 in)
1996
69.9 mm (2.8 in)
1997
64.8 mm (2.6 in)
1998
72.9 mm (2.9 in)
1999
77.0 mm (3.0 in)
2000
69.9 mm (2.8 in)
2001
48.8 mm (1.9 in)
2002
158.0 mm (6.2 in)
2003
49.8 mm (2.0 in)
2004
82.3 mm (3.2 in)
2005
44.7 mm (1.8 in)
2006
74.9 mm (2.9 in)
2007
66.8 mm (2.6 in)
2008
50.8 mm (2.0 in)
2009
82.8 mm (3.3 in)
2010
57.9 mm (2.3 in)
2011
41.9 mm (1.6 in)
2012
96.8 mm (3.8 in)
2013
88.4 mm (3.5 in)
Wettest five days (Rx5day)
The wettest five days of the year at Ahuacatlan, 1924 to 2013. The record is 233.7 mm (9.2 in) in 2004, marked on the chart; the median year is 112.9 mm (4.4 in).
Wettest five days (Rx5day) at Ahuacatlan by year
Year
Wettest five days (Rx5day)
1924
91.4 mm (3.6 in)
1925
113.0 mm (4.4 in)
1926
134.7 mm (5.3 in)
1927
90.3 mm (3.6 in)
1928
93.5 mm (3.7 in)
1929
132.2 mm (5.2 in)
1930
87.4 mm (3.4 in)
1931
120.4 mm (4.7 in)
1932
74.0 mm (2.9 in)
1933
124.5 mm (4.9 in)
1934
122.9 mm (4.8 in)
1935
146.9 mm (5.8 in)
1936
111.0 mm (4.4 in)
1937
72.8 mm (2.9 in)
1938
189.8 mm (7.5 in)
1939
113.3 mm (4.5 in)
1940
98.2 mm (3.9 in)
1941
136.2 mm (5.4 in)
1942
106.5 mm (4.2 in)
1943
99.8 mm (3.9 in)
1944
111.8 mm (4.4 in)
1945
80.4 mm (3.2 in)
1946
88.5 mm (3.5 in)
1947
109.5 mm (4.3 in)
1948
95.5 mm (3.8 in)
1949
84.1 mm (3.3 in)
1950
115.4 mm (4.5 in)
1951
83.9 mm (3.3 in)
1952
121.4 mm (4.8 in)
1953
101.6 mm (4.0 in)
1954
141.2 mm (5.6 in)
1955
177.4 mm (7.0 in)
1956
109.0 mm (4.3 in)
1957
111.8 mm (4.4 in)
1958
117.4 mm (4.6 in)
1959
112.7 mm (4.4 in)
1960
166.4 mm (6.6 in)
1961
136.0 mm (5.4 in)
1962
110.3 mm (4.3 in)
1963
128.9 mm (5.1 in)
1964
87.6 mm (3.4 in)
1965
81.0 mm (3.2 in)
1966
117.7 mm (4.6 in)
1967
126.7 mm (5.0 in)
1968
115.9 mm (4.6 in)
1969
90.7 mm (3.6 in)
1970
95.9 mm (3.8 in)
1971
107.7 mm (4.2 in)
1972
104.4 mm (4.1 in)
1973
112.3 mm (4.4 in)
1974
122.5 mm (4.8 in)
1975
107.0 mm (4.2 in)
1976
76.4 mm (3.0 in)
1977
115.6 mm (4.6 in)
1978
89.1 mm (3.5 in)
1979
115.0 mm (4.5 in)
1980
84.6 mm (3.3 in)
1981
97.0 mm (3.8 in)
1982
118.6 mm (4.7 in)
1983
93.6 mm (3.7 in)
1984
88.3 mm (3.5 in)
1985
143.6 mm (5.7 in)
1986
123.7 mm (4.9 in)
1987
121.2 mm (4.8 in)
1988
173.6 mm (6.8 in)
1989
87.2 mm (3.4 in)
1990
35.4 mm (1.4 in)
1991
100.6 mm (4.0 in)
1992
114.6 mm (4.5 in)
1993
122.2 mm (4.8 in)
1994
100.3 mm (3.9 in)
1995
73.7 mm (2.9 in)
1996
132.7 mm (5.2 in)
1997
143.6 mm (5.7 in)
1998
119.4 mm (4.7 in)
1999
114.4 mm (4.5 in)
2000
120.4 mm (4.7 in)
2001
113.1 mm (4.5 in)
2002
224.5 mm (8.8 in)
2003
148.4 mm (5.8 in)
2004
233.7 mm (9.2 in)
2005
88.5 mm (3.5 in)
2006
97.8 mm (3.9 in)
2007
144.5 mm (5.7 in)
2008
123.1 mm (4.8 in)
2009
166.4 mm (6.6 in)
2010
146.4 mm (5.8 in)
2011
81.9 mm (3.2 in)
2012
133.9 mm (5.3 in)
2013
105.1 mm (4.1 in)
Longest dry spell (CDD)
The longest dry spell of the year at Ahuacatlan, 1924 to 2013. The record is 165 days in 1989, marked on the chart; the median year is 73 days.
Longest dry spell (CDD) at Ahuacatlan by year
Year
Longest dry spell (CDD)
1924
52 days
1925
61 days
1926
61 days
1927
91 days
1928
72 days
1929
48 days
1930
56 days
1931
55 days
1932
30 days
1933
41 days
1934
73 days
1935
30 days
1936
90 days
1937
110 days
1938
30 days
1939
89 days
1940
32 days
1941
60 days
1942
117 days
1943
30 days
1944
55 days
1945
113 days
1946
30 days
1947
60 days
1948
59 days
1949
85 days
1950
89 days
1951
75 days
1952
59 days
1953
30 days
1954
30 days
1955
30 days
1956
40 days
1957
30 days
1958
73 days
1959
30 days
1960
151 days
1961
30 days
1962
60 days
1963
58 days
1964
60 days
1965
59 days
1966
34 days
1967
43 days
1968
30 days
1969
131 days
1970
70 days
1971
132 days
1972
56 days
1973
37 days
1974
58 days
1975
63 days
1976
151 days
1977
89 days
1978
89 days
1979
64 days
1980
95 days
1981
95 days
1982
90 days
1983
73 days
1984
30 days
1985
30 days
1986
126 days
1987
80 days
1988
162 days
1989
165 days
1990
24 days
1991
165 days
1992
85 days
1993
101 days
1994
100 days
1995
162 days
1996
152 days
1997
47 days
1998
113 days
1999
165 days
2000
88 days
2001
157 days
2002
112 days
2003
126 days
2004
82 days
2005
117 days
2006
138 days
2007
125 days
2008
161 days
2009
129 days
2010
108 days
2011
151 days
2012
97 days
2013
40 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
76 years, 1927 to 2011
A day with at least 55.9 mm (2.2 in) of rain is expected about once in 2 years. A day with at least 126.3 mm (5.0 in) of rain is expected about once in 100 years.
Rainfall return levels at Ahuacatlan: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
55.9 mm (2.2 in)
5 years
71.5 mm (2.8 in)
10 years
83.0 mm (3.3 in)
25 years
99.0 mm (3.9 in)
50 years
112.2 mm (4.4 in)
100 years
126.3 mm (5.0 in)
Longer than the 76 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, 76 years of values from 1927 to 2011.
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: 158.0 mm (6.2 in) in 2002; 125.5 mm (4.9 in) in 1955; 89.9 mm (3.5 in) in 1991.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Ahuacatlan, at 1965. Each is measured against neighbouring stations.
Relative to 4 neighbouring stations, the station's annual mean temperature from 1965 ran 0.6 C (1.1 F) higher than in the years before (possible change).
Suspected changes in the annual mean temperature at Ahuacatlan, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1965
+0.6
+1.1
possible
4
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 Ahuacatlan standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Ahuacatlan 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.