Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Tecamachalco. 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 Tecamachalco, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
32.8 C (91.0 F)
-11.1 C (12.0 F)
n/a
n/a
Feb
37.2 C (99.0 F)
-6.1 C (21.0 F)
n/a
n/a
Mar
37.8 C (100.0 F)
-5.6 C (21.9 F)
n/a
n/a
Apr
37.8 C (100.0 F)
-2.2 C (28.0 F)
n/a
n/a
May
36.7 C (98.1 F)
0.0 C (32.0 F)
n/a
n/a
Jun
36.1 C (97.0 F)
1.7 C (35.1 F)
n/a
n/a
Jul
35.0 C (95.0 F)
1.7 C (35.1 F)
n/a
n/a
Aug
33.9 C (93.0 F)
3.9 C (39.0 F)
n/a
n/a
Sep
33.9 C (93.0 F)
-3.3 C (26.1 F)
n/a
n/a
Oct
32.8 C (91.0 F)
-6.1 C (21.0 F)
n/a
n/a
Nov
33.9 C (93.0 F)
-6.1 C (21.0 F)
n/a
n/a
Dec
32.2 C (90.0 F)
-5.6 C (21.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Tecamachalco still stand. 1944 holds the most, with 188.
Standing records at Tecamachalco by the year they were set
Year set
Standing records
1943
9
1944
188
1945
170
1946
173
1947
54
1948
9
1949
10
1950
12
1951
10
1952
13
1953
9
1954
26
1955
14
1956
11
1957
17
1958
15
1959
6
1960
17
1961
19
1962
18
1963
15
1964
10
1965
10
1966
13
1967
7
1968
19
1969
5
1970
10
1971
9
1972
6
1973
10
1974
15
1975
9
1976
11
1977
9
1978
20
1979
9
1980
9
1981
6
1982
4
1983
13
1984
11
1985
5
1986
7
1987
9
1988
9
1990
6
1991
8
1992
87
1993
41
1994
37
1998
9
1999
74
2000
28
2001
29
2002
13
2003
10
2004
4
2005
6
2006
23
2007
6
2008
12
2009
11
All-Time Record Progression
3 new records
3 all-time records were set at Tecamachalco between 24 July 1979 and 14 February 1999. Each dot is a new record.
When Tecamachalco set new all-time records
Date
Kind
Detail
1979-07-24
Record daily precipitation
Record daily precipitation 74.4 mm (2.9 in)
1979-08-28
Record daily precipitation
Record daily precipitation 79.8 mm (3.1 in)
1999-02-14
Record low maximum temperature
Record low maximum temperature 7.8 C (46.0 F)
Wettest Day of Each Month
Aug: 79.8 mm (3.1 in)
The wettest day on record for each calendar month at Tecamachalco. The most was 79.8 mm (3.1 in) on 28 August 1979.
Record daily precipitation for each month at Tecamachalco
Month
Record daily precipitation (mm)
Date
Jan
35.3 mm (1.4 in)
11 January 1984
Feb
34.8 mm (1.4 in)
26 February 1982
Mar
25.4 mm (1.0 in)
1 March 1995
Apr
38.9 mm (1.5 in)
22 April 1962
May
45.0 mm (1.8 in)
9 May 1945
Jun
63.0 mm (2.5 in)
6 June 1978
Jul
74.4 mm (2.9 in)
24 July 1979
Aug
79.8 mm (3.1 in)
28 August 1979
Sep
63.8 mm (2.5 in)
3 September 1991
Oct
66.3 mm (2.6 in)
15 October 1971
Nov
37.6 mm (1.5 in)
6 November 1972
Dec
23.6 mm (0.9 in)
12 December 1958
Period of Record Coverage
1943 to 2009
Complete yearUnder 90 percent of days
64 years of record at Tecamachalco, 1943 to 2009. 12 years have data for under 90 percent of days and are left out of rankings: 1943, 1962, 1965, 1966, 1987, 1988, 1990, 1994 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 50 complete years at Tecamachalco, 1944 to 2009. Blue stripes are years cooler than the station's own mean of 16.7 C (62.1 F); red stripes are warmer. The coolest year was 1993, at 13.8 C (56.8 F), and the warmest was 1946, at 20.8 C (69.4 F). The strongest colour marks a difference of 4.1 C (7.4 F).
Annual mean temperature at Tecamachalco as warming stripes, 1944 to 2009
Year
Annual mean temperature
Difference from the station mean
1944
20.2 C
+3.49 C
1945
20.6 C
+3.86 C
1946
20.8 C
+4.09 C
1947
18.5 C
+1.76 C
1948
17.7 C
+1.00 C
1949
17.3 C
+0.60 C
1950
16.7 C
-0.02 C
1951
17.0 C
+0.25 C
1952
16.7 C
-0.04 C
1953
17.2 C
+0.50 C
1954
16.0 C
-0.66 C
1955
16.8 C
+0.10 C
1956
16.7 C
-0.03 C
1957
17.3 C
+0.62 C
1959
17.0 C
+0.34 C
1960
17.0 C
+0.25 C
1961
16.8 C
+0.13 C
1963
16.8 C
+0.10 C
1964
17.1 C
+0.42 C
1967
16.6 C
-0.10 C
1968
16.4 C
-0.26 C
1969
17.3 C
+0.63 C
1970
16.9 C
+0.17 C
1971
16.8 C
+0.08 C
1972
17.0 C
+0.34 C
1973
16.7 C
-0.01 C
1974
16.1 C
-0.61 C
1975
16.2 C
-0.46 C
1976
16.4 C
-0.30 C
1977
17.2 C
+0.50 C
1978
17.3 C
+0.59 C
1979
16.9 C
+0.22 C
1980
17.1 C
+0.42 C
1981
16.2 C
-0.55 C
1982
16.4 C
-0.31 C
1983
16.2 C
-0.55 C
1984
15.8 C
-0.88 C
1985
15.9 C
-0.83 C
1986
16.2 C
-0.46 C
1991
16.5 C
-0.25 C
1992
14.5 C
-2.25 C
1993
13.8 C
-2.90 C
2001
14.9 C
-1.82 C
2002
15.6 C
-1.07 C
2003
16.7 C
-0.04 C
2004
16.0 C
-0.67 C
2005
16.3 C
-0.45 C
2006
15.1 C
-1.60 C
2008
15.0 C
-1.74 C
2009
15.2 C
-1.46 C
The annual mean temperature here has fallen by 0.5 C (0.3 to 0.6) per decade over 1944 to 2009. In Fahrenheit: 0.8 F (0.6 to 1.1) per decade. The slope is a straight line fitted to 50 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Tecamachalco
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.5 C (-0.6 to -0.3) per decade
-0.8 F (-1.1 to -0.6) per decade
1944 to 2009
50
Fall
Mean daily maximum
-0.5 C (-0.7 to -0.3) per decade
-0.9 F (-1.2 to -0.6) per decade
1944 to 2009
50
Fall
Mean daily minimum
-0.4 C (-0.6 to -0.3) per decade
-0.8 F (-1.1 to -0.5) per decade
1944 to 2009
50
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
1943 to 2009
Yearly extremes at Tecamachalco: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
37.8 C (100.0 F)
1945
33.9 C (93.0 F)
64
Coldest night (TNn)
-11.1 C (12.0 F)
1973
-4.4 C (24.1 F)
64
Wettest day (Rx1day)
79.8 mm (3.1 in)
1979
43.2 mm (1.7 in)
64
Wettest five days (Rx5day)
176.4 mm (6.9 in)
1978
82.2 mm (3.2 in)
64
Longest dry spell (CDD)
154 days
1994
62 days
64
Hottest day (TXx)
The hottest day of the year at Tecamachalco, 1943 to 2009. The record is 37.8 C (100.0 F) in 1945, marked on the chart; the median year is 33.9 C (93.0 F).
Hottest day (TXx) at Tecamachalco by year
Year
Hottest day (TXx)
1943
30.6 C (87.1 F)
1944
36.7 C (98.1 F)
1945
37.8 C (100.0 F)
1946
37.8 C (100.0 F)
1947
36.1 C (97.0 F)
1948
33.9 C (93.0 F)
1949
31.7 C (89.1 F)
1950
32.2 C (90.0 F)
1951
37.2 C (99.0 F)
1952
33.9 C (93.0 F)
1953
34.4 C (93.9 F)
1954
33.9 C (93.0 F)
1955
35.0 C (95.0 F)
1956
33.9 C (93.0 F)
1957
35.0 C (95.0 F)
1958
33.9 C (93.0 F)
1959
34.4 C (93.9 F)
1960
33.9 C (93.0 F)
1961
34.4 C (93.9 F)
1962
35.0 C (95.0 F)
1963
33.9 C (93.0 F)
1964
36.1 C (97.0 F)
1965
32.8 C (91.0 F)
1966
31.7 C (89.1 F)
1967
35.0 C (95.0 F)
1968
32.8 C (91.0 F)
1969
35.0 C (95.0 F)
1970
35.6 C (96.1 F)
1971
33.9 C (93.0 F)
1972
33.9 C (93.0 F)
1973
33.9 C (93.0 F)
1974
33.3 C (91.9 F)
1975
32.8 C (91.0 F)
1976
32.8 C (91.0 F)
1977
33.9 C (93.0 F)
1978
34.4 C (93.9 F)
1979
33.9 C (93.0 F)
1980
33.9 C (93.0 F)
1981
34.4 C (93.9 F)
1982
32.8 C (91.0 F)
1983
35.0 C (95.0 F)
1984
33.9 C (93.0 F)
1985
31.1 C (88.0 F)
1986
33.9 C (93.0 F)
1987
31.1 C (88.0 F)
1988
31.7 C (89.1 F)
1990
30.6 C (87.1 F)
1991
34.4 C (93.9 F)
1992
31.7 C (89.1 F)
1993
30.0 C (86.0 F)
1994
30.6 C (87.1 F)
1995
30.0 C (86.0 F)
1998
25.0 C (77.0 F)
1999
30.0 C (86.0 F)
2000
28.9 C (84.0 F)
2001
33.9 C (93.0 F)
2002
32.8 C (91.0 F)
2003
35.6 C (96.1 F)
2004
35.0 C (95.0 F)
2005
35.0 C (95.0 F)
2006
30.0 C (86.0 F)
2007
30.6 C (87.1 F)
2008
30.6 C (87.1 F)
2009
32.8 C (91.0 F)
Coldest night (TNn)
The coldest night of the year at Tecamachalco, 1943 to 2009. The record is -11.1 C (12.0 F) in 1973, marked on the chart; the median year is -4.4 C (24.1 F).
Coldest night (TNn) at Tecamachalco by year
Year
Coldest night (TNn)
1943
0.0 C (32.0 F)
1944
0.0 C (32.0 F)
1945
0.6 C (33.1 F)
1946
-5.0 C (23.0 F)
1947
-5.0 C (23.0 F)
1948
0.0 C (32.0 F)
1949
0.0 C (32.0 F)
1950
-5.6 C (21.9 F)
1951
-6.1 C (21.0 F)
1952
-3.3 C (26.1 F)
1953
-5.0 C (23.0 F)
1954
-3.3 C (26.1 F)
1955
-4.4 C (24.1 F)
1956
-9.4 C (15.1 F)
1957
-4.4 C (24.1 F)
1958
-2.2 C (28.0 F)
1959
-2.2 C (28.0 F)
1960
-5.6 C (21.9 F)
1961
-6.1 C (21.0 F)
1962
-2.2 C (28.0 F)
1963
-5.0 C (23.0 F)
1964
-2.8 C (27.0 F)
1965
-3.3 C (26.1 F)
1966
-7.2 C (19.0 F)
1967
-8.3 C (17.1 F)
1968
-5.6 C (21.9 F)
1969
-1.7 C (28.9 F)
1970
-5.0 C (23.0 F)
1971
-3.3 C (26.1 F)
1972
-4.4 C (24.1 F)
1973
-11.1 C (12.0 F)
1974
-5.0 C (23.0 F)
1975
-6.7 C (19.9 F)
1976
-6.1 C (21.0 F)
1977
-1.1 C (30.0 F)
1978
-1.7 C (28.9 F)
1979
-4.4 C (24.1 F)
1980
-3.3 C (26.1 F)
1981
-2.8 C (27.0 F)
1982
-4.4 C (24.1 F)
1983
-3.3 C (26.1 F)
1984
-5.0 C (23.0 F)
1985
-4.4 C (24.1 F)
1986
-6.1 C (21.0 F)
1987
-4.4 C (24.1 F)
1988
-5.0 C (23.0 F)
1990
-5.0 C (23.0 F)
1991
-1.1 C (30.0 F)
1992
-2.2 C (28.0 F)
1993
-1.1 C (30.0 F)
1994
-4.4 C (24.1 F)
1995
0.6 C (33.1 F)
1998
0.0 C (32.0 F)
1999
-6.1 C (21.0 F)
2000
-5.0 C (23.0 F)
2001
-4.4 C (24.1 F)
2002
-4.4 C (24.1 F)
2003
-4.4 C (24.1 F)
2004
-3.3 C (26.1 F)
2005
-4.4 C (24.1 F)
2006
-6.1 C (21.0 F)
2007
-2.2 C (28.0 F)
2008
-2.2 C (28.0 F)
2009
-2.2 C (28.0 F)
Wettest day (Rx1day)
The wettest day of the year at Tecamachalco, 1943 to 2009. The record is 79.8 mm (3.1 in) in 1979, marked on the chart; the median year is 43.2 mm (1.7 in).
Wettest day (Rx1day) at Tecamachalco by year
Year
Wettest day (Rx1day)
1943
7.4 mm (0.29 in)
1944
37.8 mm (1.5 in)
1945
45.0 mm (1.8 in)
1946
33.8 mm (1.3 in)
1947
51.6 mm (2.0 in)
1948
30.5 mm (1.2 in)
1949
39.9 mm (1.6 in)
1950
50.8 mm (2.0 in)
1951
48.5 mm (1.9 in)
1952
31.5 mm (1.2 in)
1953
28.7 mm (1.1 in)
1954
53.6 mm (2.1 in)
1955
55.6 mm (2.2 in)
1956
47.5 mm (1.9 in)
1957
28.4 mm (1.1 in)
1958
48.0 mm (1.9 in)
1959
28.2 mm (1.1 in)
1960
40.4 mm (1.6 in)
1961
46.0 mm (1.8 in)
1962
38.9 mm (1.5 in)
1963
43.2 mm (1.7 in)
1964
56.6 mm (2.2 in)
1965
31.2 mm (1.2 in)
1966
47.0 mm (1.9 in)
1967
40.9 mm (1.6 in)
1968
39.4 mm (1.6 in)
1969
41.9 mm (1.6 in)
1970
40.4 mm (1.6 in)
1971
66.3 mm (2.6 in)
1972
54.4 mm (2.1 in)
1973
59.9 mm (2.4 in)
1974
53.8 mm (2.1 in)
1975
35.3 mm (1.4 in)
1976
50.0 mm (2.0 in)
1977
29.5 mm (1.2 in)
1978
63.0 mm (2.5 in)
1979
79.8 mm (3.1 in)
1980
64.8 mm (2.6 in)
1981
46.0 mm (1.8 in)
1982
41.9 mm (1.6 in)
1983
57.9 mm (2.3 in)
1984
38.9 mm (1.5 in)
1985
61.0 mm (2.4 in)
1986
39.9 mm (1.6 in)
1987
57.9 mm (2.3 in)
1988
51.3 mm (2.0 in)
1990
33.8 mm (1.3 in)
1991
63.8 mm (2.5 in)
1992
45.0 mm (1.8 in)
1993
27.4 mm (1.1 in)
1994
56.9 mm (2.2 in)
1995
25.4 mm (1.0 in)
1998
9.1 mm (0.36 in)
1999
43.2 mm (1.7 in)
2000
28.2 mm (1.1 in)
2001
23.9 mm (0.9 in)
2002
52.3 mm (2.1 in)
2003
35.6 mm (1.4 in)
2004
48.8 mm (1.9 in)
2005
32.5 mm (1.3 in)
2006
34.3 mm (1.4 in)
2007
51.1 mm (2.0 in)
2008
51.8 mm (2.0 in)
2009
38.6 mm (1.5 in)
Wettest five days (Rx5day)
The wettest five days of the year at Tecamachalco, 1943 to 2009. The record is 176.4 mm (6.9 in) in 1978, marked on the chart; the median year is 82.2 mm (3.2 in).
Wettest five days (Rx5day) at Tecamachalco by year
Year
Wettest five days (Rx5day)
1943
11.2 mm (0.4 in)
1944
59.7 mm (2.4 in)
1945
73.7 mm (2.9 in)
1946
91.5 mm (3.6 in)
1947
79.2 mm (3.1 in)
1948
60.9 mm (2.4 in)
1949
62.6 mm (2.5 in)
1950
93.2 mm (3.7 in)
1951
71.5 mm (2.8 in)
1952
83.5 mm (3.3 in)
1953
54.4 mm (2.1 in)
1954
92.6 mm (3.6 in)
1955
78.3 mm (3.1 in)
1956
70.9 mm (2.8 in)
1957
50.0 mm (2.0 in)
1958
117.8 mm (4.6 in)
1959
63.3 mm (2.5 in)
1960
95.0 mm (3.7 in)
1961
80.8 mm (3.2 in)
1962
63.9 mm (2.5 in)
1963
75.2 mm (3.0 in)
1964
56.9 mm (2.2 in)
1965
52.9 mm (2.1 in)
1966
96.1 mm (3.8 in)
1967
100.4 mm (4.0 in)
1968
100.4 mm (4.0 in)
1969
104.8 mm (4.1 in)
1970
78.5 mm (3.1 in)
1971
85.9 mm (3.4 in)
1972
132.3 mm (5.2 in)
1973
107.7 mm (4.2 in)
1974
92.9 mm (3.7 in)
1975
74.9 mm (2.9 in)
1976
111.6 mm (4.4 in)
1977
79.8 mm (3.1 in)
1978
176.4 mm (6.9 in)
1979
112.3 mm (4.4 in)
1980
107.3 mm (4.2 in)
1981
107.2 mm (4.2 in)
1982
114.8 mm (4.5 in)
1983
78.0 mm (3.1 in)
1984
134.4 mm (5.3 in)
1985
134.7 mm (5.3 in)
1986
55.7 mm (2.2 in)
1987
84.1 mm (3.3 in)
1988
105.8 mm (4.2 in)
1990
36.8 mm (1.4 in)
1991
137.3 mm (5.4 in)
1992
103.8 mm (4.1 in)
1993
52.4 mm (2.1 in)
1994
92.7 mm (3.6 in)
1995
34.8 mm (1.4 in)
1998
9.9 mm (0.39 in)
1999
95.3 mm (3.8 in)
2000
67.8 mm (2.7 in)
2001
46.5 mm (1.8 in)
2002
100.6 mm (4.0 in)
2003
84.5 mm (3.3 in)
2004
79.3 mm (3.1 in)
2005
66.1 mm (2.6 in)
2006
77.7 mm (3.1 in)
2007
87.2 mm (3.4 in)
2008
72.9 mm (2.9 in)
2009
95.6 mm (3.8 in)
Longest dry spell (CDD)
The longest dry spell of the year at Tecamachalco, 1943 to 2009. The record is 154 days in 1994, marked on the chart; the median year is 62 days.
Longest dry spell (CDD) at Tecamachalco by year
Year
Longest dry spell (CDD)
1943
29 days
1944
73 days
1945
72 days
1946
49 days
1947
47 days
1948
56 days
1949
62 days
1950
69 days
1951
74 days
1952
61 days
1953
107 days
1954
51 days
1955
118 days
1956
76 days
1957
53 days
1958
53 days
1959
58 days
1960
80 days
1961
70 days
1962
31 days
1963
79 days
1964
63 days
1965
32 days
1966
59 days
1967
35 days
1968
33 days
1969
62 days
1970
77 days
1971
92 days
1972
40 days
1973
72 days
1974
92 days
1975
97 days
1976
58 days
1977
90 days
1978
31 days
1979
59 days
1980
34 days
1981
62 days
1982
80 days
1983
59 days
1984
64 days
1985
41 days
1986
59 days
1987
62 days
1988
57 days
1990
52 days
1991
104 days
1992
45 days
1993
47 days
1994
154 days
1995
50 days
1998
44 days
1999
77 days
2000
45 days
2001
62 days
2002
81 days
2003
104 days
2004
59 days
2005
71 days
2006
82 days
2007
37 days
2008
88 days
2009
58 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.
Frost Dates and Growing Season
43 years with a frost
Across 43 years with a frost, the median last spring frost at Tecamachalco falls on 28 February and the median first autumn frost on 19 November, which leaves a median of 276 days between them.
Fitted over all years, the growing season changes by -1.3 days per decade at this station.
Frost dates and growing season at Tecamachalco
Measure
Median, all years
Earliest period
Recent period (1963 to 2009)
Recent against earliest
Fitted trend
Last spring frost
28 February
n/a
3 March
n/a
+2.4 days per decade
First autumn frost
19 November
n/a
20 November
n/a
+1.1 days per decade
Growing days
276 days
n/a
275 days
n/a
-1.3 days per decade
A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.
Rainfall Return Levels
53 years, 1944 to 2009
A day with at least 44.4 mm (1.7 in) of rain is expected about once in 2 years. A day with at least 76.2 mm (3.0 in) of rain is expected about once in 100 years.
Rainfall return levels at Tecamachalco: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
44.4 mm (1.7 in)
5 years
55.1 mm (2.2 in)
10 years
61.2 mm (2.4 in)
25 years
68.0 mm (2.7 in)
50 years
72.3 mm (2.8 in)
100 years
76.2 mm (3.0 in)
Longer than the 53 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, 53 years of values from 1944 to 2009.
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: 79.8 mm (3.1 in) in 1979; 66.3 mm (2.6 in) in 1971; 64.8 mm (2.6 in) in 1980.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Tecamachalco standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Tecamachalco 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.