Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Atzalan. 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 Atzalan, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
30.0 C (86.0 F)
-5.0 C (23.0 F)
n/a
n/a
Feb
32.8 C (91.0 F)
-2.8 C (27.0 F)
n/a
n/a
Mar
35.6 C (96.1 F)
-1.1 C (30.0 F)
n/a
n/a
Apr
36.7 C (98.1 F)
1.1 C (34.0 F)
n/a
n/a
May
38.9 C (102.0 F)
1.7 C (35.1 F)
n/a
n/a
Jun
35.6 C (96.1 F)
5.6 C (42.1 F)
n/a
n/a
Jul
30.6 C (87.1 F)
0.0 C (32.0 F)
n/a
n/a
Aug
32.2 C (90.0 F)
5.0 C (41.0 F)
n/a
n/a
Sep
30.6 C (87.1 F)
2.8 C (37.0 F)
n/a
n/a
Oct
31.7 C (89.1 F)
-1.1 C (30.0 F)
n/a
n/a
Nov
32.8 C (91.0 F)
-5.0 C (23.0 F)
n/a
n/a
Dec
30.6 C (87.1 F)
-4.4 C (24.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Atzalan still stand. 2011 holds the most, with 55.
Standing records at Atzalan by the year they were set
Year set
Standing records
1924
17
1925
27
1926
24
1927
6
1928
47
1929
22
1930
17
1931
9
1932
24
1933
23
1934
20
1935
25
1936
17
1938
13
1939
31
1940
10
1941
20
1942
29
1943
22
1944
18
1945
6
1946
8
1947
18
1948
7
1949
5
1950
13
1951
13
1952
23
1953
13
1954
9
1955
18
1956
9
1957
10
1958
11
1959
17
1960
14
1961
22
1962
13
1963
8
1964
6
1965
10
1966
14
1967
15
1968
10
1969
14
1970
11
1971
8
1972
6
1973
15
1974
14
1975
4
1976
20
1977
25
1978
24
1979
29
1980
18
1981
11
1982
9
1983
26
1984
22
1985
3
1986
3
1987
39
1988
23
1989
21
1990
14
1991
31
1992
12
1993
21
1994
20
1995
27
1996
15
1997
22
1998
38
1999
11
2001
16
2005
7
2006
15
2007
10
2008
21
2009
25
2010
46
2011
55
All-Time Record Progression
5 new records
5 all-time records were set at Atzalan between 11 January 1962 and 5 October 1999. Each dot is a new record.
When Atzalan set new all-time records
Date
Kind
Detail
1962-01-11
Record low maximum temperature
Record low maximum temperature 1.1 C (34.0 F)
1983-04-19
Record high maximum temperature
Record high maximum temperature 36.1 C (97.0 F)
1983-05-02
Record high maximum temperature
Record high maximum temperature 36.7 C (98.1 F)
1998-05-07
Record high maximum temperature
Record high maximum temperature 38.9 C (102.0 F)
1999-10-05
Record daily precipitation
Record daily precipitation 312.9 mm (12.3 in)
Wettest Day of Each Month
Oct: 312.9 mm (12.3 in)
The wettest day on record for each calendar month at Atzalan. The most was 312.9 mm (12.3 in) on 5 October 1999.
Record daily precipitation for each month at Atzalan
Month
Record daily precipitation (mm)
Date
Jan
125.0 mm (4.9 in)
17 January 1932
Feb
113.3 mm (4.5 in)
21 February 2009
Mar
112.8 mm (4.4 in)
29 March 1971
Apr
160.8 mm (6.3 in)
12 April 2008
May
149.9 mm (5.9 in)
21 May 1931
Jun
254.8 mm (10.0 in)
24 June 1932
Jul
168.9 mm (6.6 in)
29 July 1931
Aug
193.8 mm (7.6 in)
5 August 1979
Sep
311.9 mm (12.3 in)
28 September 1955
Oct
312.9 mm (12.3 in)
5 October 1999
Nov
149.9 mm (5.9 in)
3 November 1929
Dec
74.9 mm (2.9 in)
6 December 1983
Period of Record Coverage
1924 to 2011
Complete yearUnder 90 percent of days
84 years of record at Atzalan, 1924 to 2011. 9 years have data for under 90 percent of days and are left out of rankings: 1924, 1927, 1929, 1930, 1975, 1985, 1986, 2000 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 74 complete years at Atzalan, 1925 to 2011. Blue stripes are years cooler than the station's own mean of 15.5 C (59.9 F); red stripes are warmer. The coolest year was 2011, at 13.3 C (56.0 F), and the warmest was 1995, at 17.1 C (62.7 F). The strongest colour marks a difference of 2.2 C (4.0 F).
Annual mean temperature at Atzalan as warming stripes, 1925 to 2011
Year
Annual mean temperature
Difference from the station mean
1925
13.8 C
-1.66 C
1926
13.7 C
-1.83 C
1928
16.5 C
+0.95 C
1931
15.5 C
+0.04 C
1933
15.8 C
+0.32 C
1934
14.6 C
-0.89 C
1935
15.1 C
-0.38 C
1936
15.2 C
-0.33 C
1938
15.6 C
+0.05 C
1939
16.4 C
+0.86 C
1940
16.0 C
+0.52 C
1941
16.4 C
+0.88 C
1942
16.5 C
+1.02 C
1943
15.7 C
+0.24 C
1944
15.2 C
-0.29 C
1945
15.6 C
+0.10 C
1946
15.3 C
-0.19 C
1947
15.6 C
+0.05 C
1948
15.7 C
+0.19 C
1949
15.6 C
+0.11 C
1950
15.3 C
-0.23 C
1951
15.3 C
-0.25 C
1952
15.0 C
-0.51 C
1953
15.4 C
-0.14 C
1954
14.7 C
-0.78 C
1955
14.9 C
-0.57 C
1956
14.4 C
-1.11 C
1957
15.0 C
-0.46 C
1958
15.0 C
-0.48 C
1959
14.6 C
-0.86 C
1960
15.1 C
-0.37 C
1961
14.8 C
-0.75 C
1962
14.9 C
-0.59 C
1963
14.4 C
-1.09 C
1964
15.4 C
-0.15 C
1965
15.4 C
-0.11 C
1966
14.9 C
-0.60 C
1967
15.3 C
-0.19 C
1968
15.1 C
-0.42 C
1969
15.8 C
+0.34 C
1970
15.3 C
-0.21 C
1971
15.8 C
+0.34 C
1972
15.8 C
+0.26 C
1973
16.0 C
+0.51 C
1974
15.7 C
+0.20 C
1976
15.0 C
-0.47 C
1977
16.1 C
+0.55 C
1978
16.1 C
+0.64 C
1979
16.1 C
+0.57 C
1980
16.0 C
+0.51 C
1981
15.8 C
+0.30 C
1982
16.0 C
+0.51 C
1983
15.7 C
+0.15 C
1984
15.1 C
-0.41 C
1987
15.9 C
+0.36 C
1988
16.2 C
+0.70 C
1989
16.3 C
+0.76 C
1990
16.1 C
+0.57 C
1991
16.7 C
+1.24 C
1992
15.8 C
+0.32 C
1993
16.3 C
+0.84 C
1994
16.7 C
+1.18 C
1995
17.1 C
+1.55 C
1996
16.2 C
+0.73 C
1997
16.0 C
+0.54 C
1998
17.0 C
+1.50 C
1999
15.8 C
+0.34 C
2005
15.5 C
+0.04 C
2006
15.3 C
-0.22 C
2007
14.9 C
-0.56 C
2008
15.5 C
+0.01 C
2009
15.4 C
-0.09 C
2010
13.9 C
-1.62 C
2011
13.3 C
-2.19 C
The fitted trend in annual mean temperature here over 1925 to 2011 is 0.06 C (-0.01 to 0.13) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.11 F (-0.02 to 0.24) per decade. The slope is a straight line fitted to 74 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Atzalan
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.06 C (-0.01 to 0.13) per decade
0.11 F (-0.02 to 0.24) per decade
1925 to 2011
74
Not clearly different from zero
Mean daily maximum
0.1 C (0.1 to 0.2) per decade
0.3 F (0.1 to 0.4) per decade
1925 to 2011
74
Rise
Mean daily minimum
-0.02 C (-0.11 to 0.06) per decade
-0.05 F (-0.20 to 0.11) per decade
1925 to 2011
74
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 2011
Yearly extremes at Atzalan: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
38.9 C (102.0 F)
1998
32.0 C (89.5 F)
84
Coldest night (TNn)
-5.0 C (23.0 F)
1930
0.0 C (32.0 F)
84
Wettest day (Rx1day)
312.9 mm (12.3 in)
1999
127.4 mm (5.0 in)
84
Wettest five days (Rx5day)
1,195.2 mm (47.1 in)
1944
239.1 mm (9.4 in)
84
Longest dry spell (CDD)
38 days
1983
19 days
84
Hottest day (TXx)
The hottest day of the year at Atzalan, 1924 to 2011. The record is 38.9 C (102.0 F) in 1998, marked on the chart; the median year is 32.0 C (89.5 F).
Hottest day (TXx) at Atzalan by year
Year
Hottest day (TXx)
1924
26.1 C (79.0 F)
1925
29.4 C (84.9 F)
1926
29.4 C (84.9 F)
1927
29.4 C (84.9 F)
1928
31.7 C (89.1 F)
1929
28.3 C (82.9 F)
1930
32.2 C (90.0 F)
1931
30.6 C (87.1 F)
1932
30.0 C (86.0 F)
1933
35.6 C (96.1 F)
1934
31.1 C (88.0 F)
1935
31.1 C (88.0 F)
1936
30.6 C (87.1 F)
1938
27.8 C (82.0 F)
1939
29.4 C (84.9 F)
1940
32.2 C (90.0 F)
1941
30.0 C (86.0 F)
1942
33.9 C (93.0 F)
1943
34.4 C (93.9 F)
1944
31.7 C (89.1 F)
1945
35.0 C (95.0 F)
1946
32.8 C (91.0 F)
1947
32.2 C (90.0 F)
1948
32.8 C (91.0 F)
1949
31.7 C (89.1 F)
1950
31.7 C (89.1 F)
1951
30.0 C (86.0 F)
1952
31.7 C (89.1 F)
1953
33.9 C (93.0 F)
1954
30.0 C (86.0 F)
1955
31.7 C (89.1 F)
1956
30.0 C (86.0 F)
1957
31.1 C (88.0 F)
1958
31.1 C (88.0 F)
1959
26.7 C (80.1 F)
1960
32.8 C (91.0 F)
1961
31.7 C (89.1 F)
1962
29.4 C (84.9 F)
1963
28.9 C (84.0 F)
1964
33.3 C (91.9 F)
1965
30.6 C (87.1 F)
1966
30.0 C (86.0 F)
1967
32.8 C (91.0 F)
1968
31.1 C (88.0 F)
1969
32.8 C (91.0 F)
1970
33.3 C (91.9 F)
1971
34.4 C (93.9 F)
1972
32.2 C (90.0 F)
1973
34.4 C (93.9 F)
1974
35.0 C (95.0 F)
1975
31.7 C (89.1 F)
1976
35.0 C (95.0 F)
1977
33.9 C (93.0 F)
1978
35.6 C (96.1 F)
1979
33.9 C (93.0 F)
1980
33.9 C (93.0 F)
1981
32.8 C (91.0 F)
1982
35.6 C (96.1 F)
1983
36.7 C (98.1 F)
1984
33.9 C (93.0 F)
1985
30.0 C (86.0 F)
1986
25.6 C (78.1 F)
1987
30.6 C (87.1 F)
1988
33.9 C (93.0 F)
1989
35.0 C (95.0 F)
1990
33.9 C (93.0 F)
1991
36.7 C (98.1 F)
1992
31.7 C (89.1 F)
1993
33.9 C (93.0 F)
1994
35.0 C (95.0 F)
1995
35.6 C (96.1 F)
1996
32.8 C (91.0 F)
1997
32.8 C (91.0 F)
1998
38.9 C (102.0 F)
1999
35.0 C (95.0 F)
2000
25.0 C (77.0 F)
2001
28.9 C (84.0 F)
2005
31.7 C (89.1 F)
2006
30.6 C (87.1 F)
2007
30.0 C (86.0 F)
2008
31.7 C (89.1 F)
2009
32.8 C (91.0 F)
2010
32.8 C (91.0 F)
2011
32.8 C (91.0 F)
Coldest night (TNn)
The coldest night of the year at Atzalan, 1924 to 2011. The record is -5.0 C (23.0 F) in 1930, marked on the chart; the median year is 0.0 C (32.0 F).
Coldest night (TNn) at Atzalan by year
Year
Coldest night (TNn)
1924
0.0 C (32.0 F)
1925
0.0 C (32.0 F)
1926
0.0 C (32.0 F)
1927
0.6 C (33.1 F)
1928
1.7 C (35.1 F)
1929
-2.2 C (28.0 F)
1930
-5.0 C (23.0 F)
1931
0.6 C (33.1 F)
1932
0.0 C (32.0 F)
1933
0.0 C (32.0 F)
1934
0.6 C (33.1 F)
1935
0.0 C (32.0 F)
1936
1.1 C (34.0 F)
1938
2.2 C (36.0 F)
1939
2.8 C (37.0 F)
1940
0.6 C (33.1 F)
1941
0.0 C (32.0 F)
1942
0.6 C (33.1 F)
1943
0.0 C (32.0 F)
1944
-2.2 C (28.0 F)
1945
-3.3 C (26.1 F)
1946
0.6 C (33.1 F)
1947
-2.2 C (28.0 F)
1948
1.1 C (34.0 F)
1949
0.0 C (32.0 F)
1950
0.0 C (32.0 F)
1951
-2.2 C (28.0 F)
1952
0.0 C (32.0 F)
1953
-1.7 C (28.9 F)
1954
0.0 C (32.0 F)
1955
-2.2 C (28.0 F)
1956
-3.9 C (25.0 F)
1957
-2.2 C (28.0 F)
1958
0.0 C (32.0 F)
1959
0.6 C (33.1 F)
1960
0.0 C (32.0 F)
1961
0.0 C (32.0 F)
1962
-4.4 C (24.1 F)
1963
0.0 C (32.0 F)
1964
0.0 C (32.0 F)
1965
0.0 C (32.0 F)
1966
0.0 C (32.0 F)
1967
0.0 C (32.0 F)
1968
0.0 C (32.0 F)
1969
0.0 C (32.0 F)
1970
-2.2 C (28.0 F)
1971
0.0 C (32.0 F)
1972
0.6 C (33.1 F)
1973
0.0 C (32.0 F)
1974
0.6 C (33.1 F)
1975
0.0 C (32.0 F)
1976
0.0 C (32.0 F)
1977
0.0 C (32.0 F)
1978
0.6 C (33.1 F)
1979
0.0 C (32.0 F)
1980
0.0 C (32.0 F)
1981
1.1 C (34.0 F)
1982
0.6 C (33.1 F)
1983
0.0 C (32.0 F)
1984
1.7 C (35.1 F)
1985
0.0 C (32.0 F)
1986
-5.0 C (23.0 F)
1987
-2.8 C (27.0 F)
1988
0.6 C (33.1 F)
1989
-4.4 C (24.1 F)
1990
0.6 C (33.1 F)
1991
2.8 C (37.0 F)
1992
1.7 C (35.1 F)
1993
-1.1 C (30.0 F)
1994
1.7 C (35.1 F)
1995
1.7 C (35.1 F)
1996
-1.1 C (30.0 F)
1997
-2.2 C (28.0 F)
1998
0.0 C (32.0 F)
1999
0.6 C (33.1 F)
2000
1.7 C (35.1 F)
2001
1.7 C (35.1 F)
2005
1.7 C (35.1 F)
2006
0.0 C (32.0 F)
2007
0.6 C (33.1 F)
2008
0.0 C (32.0 F)
2009
-1.1 C (30.0 F)
2010
-4.4 C (24.1 F)
2011
-3.3 C (26.1 F)
Wettest day (Rx1day)
The wettest day of the year at Atzalan, 1924 to 2011. The record is 312.9 mm (12.3 in) in 1999, marked on the chart; the median year is 127.4 mm (5.0 in).
Wettest day (Rx1day) at Atzalan by year
Year
Wettest day (Rx1day)
1924
199.9 mm (7.9 in)
1925
113.8 mm (4.5 in)
1926
215.6 mm (8.5 in)
1927
161.3 mm (6.4 in)
1928
168.7 mm (6.6 in)
1929
149.9 mm (5.9 in)
1930
74.9 mm (2.9 in)
1931
168.9 mm (6.6 in)
1932
269.7 mm (10.6 in)
1933
177.3 mm (7.0 in)
1934
112.3 mm (4.4 in)
1935
102.9 mm (4.1 in)
1936
160.3 mm (6.3 in)
1938
176.8 mm (7.0 in)
1939
95.3 mm (3.8 in)
1940
93.7 mm (3.7 in)
1941
168.4 mm (6.6 in)
1942
203.7 mm (8.0 in)
1943
40.6 mm (1.6 in)
1944
308.9 mm (12.2 in)
1945
205.0 mm (8.1 in)
1946
96.8 mm (3.8 in)
1947
82.3 mm (3.2 in)
1948
122.4 mm (4.8 in)
1949
174.0 mm (6.9 in)
1950
204.0 mm (8.0 in)
1951
167.9 mm (6.6 in)
1952
111.8 mm (4.4 in)
1953
103.9 mm (4.1 in)
1954
203.5 mm (8.0 in)
1955
311.9 mm (12.3 in)
1956
145.8 mm (5.7 in)
1957
75.7 mm (3.0 in)
1958
111.8 mm (4.4 in)
1959
105.4 mm (4.1 in)
1960
121.9 mm (4.8 in)
1961
132.3 mm (5.2 in)
1962
54.9 mm (2.2 in)
1963
106.9 mm (4.2 in)
1964
107.4 mm (4.2 in)
1965
86.4 mm (3.4 in)
1966
148.8 mm (5.9 in)
1967
151.9 mm (6.0 in)
1968
63.8 mm (2.5 in)
1969
101.9 mm (4.0 in)
1970
83.8 mm (3.3 in)
1971
144.8 mm (5.7 in)
1972
133.9 mm (5.3 in)
1973
111.8 mm (4.4 in)
1974
262.9 mm (10.4 in)
1975
79.8 mm (3.1 in)
1976
181.9 mm (7.2 in)
1977
81.8 mm (3.2 in)
1978
165.9 mm (6.5 in)
1979
193.8 mm (7.6 in)
1980
179.8 mm (7.1 in)
1981
181.9 mm (7.2 in)
1982
104.9 mm (4.1 in)
1983
140.0 mm (5.5 in)
1984
110.0 mm (4.3 in)
1985
59.9 mm (2.4 in)
1986
117.9 mm (4.6 in)
1987
57.9 mm (2.3 in)
1988
174.0 mm (6.9 in)
1989
142.7 mm (5.6 in)
1990
113.8 mm (4.5 in)
1991
89.9 mm (3.5 in)
1992
140.0 mm (5.5 in)
1993
114.8 mm (4.5 in)
1994
67.8 mm (2.7 in)
1995
304.8 mm (12.0 in)
1996
96.8 mm (3.8 in)
1997
73.9 mm (2.9 in)
1998
100.3 mm (3.9 in)
1999
312.9 mm (12.3 in)
2000
9.9 mm (0.39 in)
2001
12.4 mm (0.5 in)
2005
137.9 mm (5.4 in)
2006
73.4 mm (2.9 in)
2007
150.9 mm (5.9 in)
2008
160.8 mm (6.3 in)
2009
162.6 mm (6.4 in)
2010
203.5 mm (8.0 in)
2011
119.9 mm (4.7 in)
Wettest five days (Rx5day)
The wettest five days of the year at Atzalan, 1924 to 2011. The record is 1,195.2 mm (47.1 in) in 1944, marked on the chart; the median year is 239.1 mm (9.4 in).
Wettest five days (Rx5day) at Atzalan by year
Year
Wettest five days (Rx5day)
1924
233.6 mm (9.2 in)
1925
255.1 mm (10.0 in)
1926
290.3 mm (11.4 in)
1927
377.7 mm (14.9 in)
1928
267.8 mm (10.5 in)
1929
302.8 mm (11.9 in)
1930
137.4 mm (5.4 in)
1931
323.9 mm (12.8 in)
1932
467.8 mm (18.4 in)
1933
396.5 mm (15.6 in)
1934
177.4 mm (7.0 in)
1935
158.5 mm (6.2 in)
1936
264.8 mm (10.4 in)
1938
280.5 mm (11.0 in)
1939
255.6 mm (10.1 in)
1940
147.3 mm (5.8 in)
1941
512.2 mm (20.2 in)
1942
442.7 mm (17.4 in)
1943
109.8 mm (4.3 in)
1944
1,195.2 mm (47.1 in)
1945
405.7 mm (16.0 in)
1946
175.6 mm (6.9 in)
1947
234.0 mm (9.2 in)
1948
135.1 mm (5.3 in)
1949
480.3 mm (18.9 in)
1950
387.7 mm (15.3 in)
1951
216.9 mm (8.5 in)
1952
400.0 mm (15.7 in)
1953
280.9 mm (11.1 in)
1954
397.1 mm (15.6 in)
1955
593.6 mm (23.4 in)
1956
445.3 mm (17.5 in)
1957
129.6 mm (5.1 in)
1958
198.1 mm (7.8 in)
1959
184.5 mm (7.3 in)
1960
151.2 mm (6.0 in)
1961
233.5 mm (9.2 in)
1962
105.7 mm (4.2 in)
1963
185.0 mm (7.3 in)
1964
186.2 mm (7.3 in)
1965
148.2 mm (5.8 in)
1966
268.5 mm (10.6 in)
1967
250.0 mm (9.8 in)
1968
179.1 mm (7.1 in)
1969
280.5 mm (11.0 in)
1970
152.1 mm (6.0 in)
1971
229.9 mm (9.1 in)
1972
359.4 mm (14.1 in)
1973
155.3 mm (6.1 in)
1974
311.2 mm (12.3 in)
1975
101.4 mm (4.0 in)
1976
326.7 mm (12.9 in)
1977
125.4 mm (4.9 in)
1978
227.4 mm (9.0 in)
1979
292.6 mm (11.5 in)
1980
221.8 mm (8.7 in)
1981
384.5 mm (15.1 in)
1982
240.3 mm (9.5 in)
1983
251.5 mm (9.9 in)
1984
335.3 mm (13.2 in)
1985
95.2 mm (3.7 in)
1986
239.1 mm (9.4 in)
1987
99.4 mm (3.9 in)
1988
236.2 mm (9.3 in)
1989
238.5 mm (9.4 in)
1990
167.4 mm (6.6 in)
1991
179.1 mm (7.1 in)
1992
279.5 mm (11.0 in)
1993
285.5 mm (11.2 in)
1994
109.5 mm (4.3 in)
1995
331.3 mm (13.0 in)
1996
199.4 mm (7.9 in)
1997
143.3 mm (5.6 in)
1998
202.1 mm (8.0 in)
1999
720.4 mm (28.4 in)
2000
32.3 mm (1.3 in)
2001
14.2 mm (0.6 in)
2005
260.2 mm (10.2 in)
2006
176.3 mm (6.9 in)
2007
192.3 mm (7.6 in)
2008
286.0 mm (11.3 in)
2009
322.1 mm (12.7 in)
2010
242.7 mm (9.6 in)
2011
239.0 mm (9.4 in)
Longest dry spell (CDD)
The longest dry spell of the year at Atzalan, 1924 to 2011. The record is 38 days in 1983, marked on the chart; the median year is 19 days.
Longest dry spell (CDD) at Atzalan by year
Year
Longest dry spell (CDD)
1924
23 days
1925
24 days
1926
21 days
1927
25 days
1928
25 days
1929
27 days
1930
19 days
1931
17 days
1932
19 days
1933
37 days
1934
11 days
1935
22 days
1936
17 days
1938
17 days
1939
24 days
1940
18 days
1941
19 days
1942
14 days
1943
18 days
1944
19 days
1945
19 days
1946
14 days
1947
20 days
1948
20 days
1949
25 days
1950
19 days
1951
24 days
1952
16 days
1953
20 days
1954
17 days
1955
15 days
1956
17 days
1957
17 days
1958
11 days
1959
19 days
1960
10 days
1961
26 days
1962
22 days
1963
20 days
1964
27 days
1965
29 days
1966
17 days
1967
16 days
1968
14 days
1969
23 days
1970
24 days
1971
23 days
1972
18 days
1973
16 days
1974
21 days
1975
27 days
1976
13 days
1977
14 days
1978
25 days
1979
17 days
1980
18 days
1981
22 days
1982
21 days
1983
38 days
1984
25 days
1985
16 days
1986
8 days
1987
25 days
1988
25 days
1989
14 days
1990
15 days
1991
11 days
1992
20 days
1993
14 days
1994
13 days
1995
17 days
1996
16 days
1997
15 days
1998
37 days
1999
26 days
2000
8 days
2001
32 days
2005
26 days
2006
20 days
2007
32 days
2008
18 days
2009
19 days
2010
15 days
2011
20 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, 1925 to 2011
A day with at least 132.4 mm (5.2 in) of rain is expected about once in 2 years. A day with at least 344.0 mm (13.5 in) of rain is expected about once in 100 years.
Rainfall return levels at Atzalan: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
132.4 mm (5.2 in)
5 years
186.6 mm (7.3 in)
10 years
223.5 mm (8.8 in)
25 years
271.1 mm (10.7 in)
50 years
307.4 mm (12.1 in)
100 years
344.0 mm (13.5 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 1925 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: 312.9 mm (12.3 in) in 1999; 311.9 mm (12.3 in) in 1955; 308.9 mm (12.2 in) in 1944.
Station Changes
2 suspected
2 changes were suspected in the annual mean temperature of Atzalan, at 1965 and 1982. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1965 ran 0.4 C (0.8 F) higher than in the years before (likely change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1982 ran 0.6 C (1.1 F) lower than in the years before (likely change).
Suspected changes in the annual mean temperature at Atzalan, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1965
+0.4
+0.8
likely
5
1982
-0.6
-1.1
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 Atzalan standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Atzalan 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.