Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Lerma. 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 Lerma, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
31.7 C (89.1 F)
-11.1 C (12.0 F)
n/a
n/a
Feb
28.9 C (84.0 F)
-10.0 C (14.0 F)
n/a
n/a
Mar
30.0 C (86.0 F)
-8.9 C (16.0 F)
n/a
n/a
Apr
31.7 C (89.1 F)
-6.1 C (21.0 F)
n/a
n/a
May
36.7 C (98.1 F)
-2.2 C (28.0 F)
n/a
n/a
Jun
33.9 C (93.0 F)
-1.1 C (30.0 F)
n/a
n/a
Jul
28.9 C (84.0 F)
1.7 C (35.1 F)
n/a
n/a
Aug
28.9 C (84.0 F)
0.6 C (33.1 F)
n/a
n/a
Sep
31.7 C (89.1 F)
0.0 C (32.0 F)
n/a
n/a
Oct
31.1 C (88.0 F)
-5.0 C (23.0 F)
n/a
n/a
Nov
31.7 C (89.1 F)
-10.0 C (14.0 F)
n/a
n/a
Dec
31.7 C (89.1 F)
-9.4 C (15.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Lerma still stand. 1986 holds the most, with 63.
Standing records at Lerma by the year they were set
Year set
Standing records
1942
16
1943
30
1944
22
1946
26
1947
30
1948
32
1949
16
1950
14
1951
18
1952
22
1953
15
1954
10
1955
16
1956
17
1957
3
1958
8
1959
12
1960
15
1961
26
1962
37
1963
16
1964
18
1965
26
1966
30
1967
16
1968
24
1969
33
1970
19
1971
53
1972
50
1973
10
1974
29
1975
21
1976
24
1977
16
1978
20
1979
24
1980
25
1981
22
1982
30
1983
48
1984
1
1985
25
1986
63
1987
20
1988
21
1989
14
1990
26
1991
29
1992
28
1995
24
1996
42
1997
31
1998
24
1999
49
2000
23
2001
14
2002
35
2003
22
2004
22
2006
6
2007
6
All-Time Record Progression
6 new records
6 all-time records were set at Lerma between 27 September 1978 and 23 June 2001. Each dot is a new record.
When Lerma set new all-time records
Date
Kind
Detail
1978-09-27
Record daily precipitation
Record daily precipitation 91.2 mm (3.6 in)
1983-05-20
Record high maximum temperature
Record high maximum temperature 32.2 C (90.0 F)
1996-08-27
Record daily precipitation
Record daily precipitation 95.0 mm (3.7 in)
1997-01-12
Record low minimum temperature
Record low minimum temperature -11.1 C (12.0 F)
1999-05-06
Record high maximum temperature
Record high maximum temperature 36.7 C (98.1 F)
2001-06-23
Record daily precipitation
Record daily precipitation 96.5 mm (3.8 in)
Wettest Day of Each Month
Jun: 96.5 mm (3.8 in)
The wettest day on record for each calendar month at Lerma. The most was 96.5 mm (3.8 in) on 23 June 2001.
Record daily precipitation for each month at Lerma
Month
Record daily precipitation (mm)
Date
Jan
52.8 mm (2.1 in)
10 January 1967
Feb
21.3 mm (0.8 in)
22 February 1981
Mar
45.0 mm (1.8 in)
5 March 1988
Apr
43.9 mm (1.7 in)
13 April 1962
May
50.3 mm (2.0 in)
8 May 2002
Jun
96.5 mm (3.8 in)
23 June 2001
Jul
84.8 mm (3.3 in)
5 July 2000
Aug
95.0 mm (3.7 in)
27 August 1996
Sep
91.2 mm (3.6 in)
27 September 1978
Oct
85.9 mm (3.4 in)
27 October 1960
Nov
30.0 mm (1.2 in)
3 November 2003
Dec
18.8 mm (0.7 in)
26 December 1995
Period of Record Coverage
1942 to 2007
Complete yearUnder 90 percent of days
63 years of record at Lerma, 1942 to 2007. 15 years have data for under 90 percent of days and are left out of rankings: 1942, 1947, 1974, 1984, 1992, 1993, 1995, 1996 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 45 complete years at Lerma, 1943 to 2003. Blue stripes are years cooler than the station's own mean of 12.6 C (54.8 F); red stripes are warmer. The coolest year was 1966, at 11.6 C (52.8 F), and the warmest was 2003, at 13.7 C (56.6 F). The strongest colour marks a difference of 1.1 C (2.0 F).
Annual mean temperature at Lerma as warming stripes, 1943 to 2003
Year
Annual mean temperature
Difference from the station mean
1943
12.9 C
+0.21 C
1944
12.9 C
+0.23 C
1946
13.3 C
+0.68 C
1948
13.6 C
+0.92 C
1949
12.9 C
+0.28 C
1950
12.5 C
-0.16 C
1951
12.8 C
+0.15 C
1952
12.9 C
+0.24 C
1953
12.9 C
+0.24 C
1954
12.7 C
+0.07 C
1955
12.5 C
-0.15 C
1956
12.0 C
-0.66 C
1957
12.5 C
-0.16 C
1959
13.0 C
+0.35 C
1960
13.1 C
+0.46 C
1962
12.1 C
-0.59 C
1963
12.0 C
-0.62 C
1964
12.0 C
-0.60 C
1965
11.8 C
-0.81 C
1966
11.6 C
-1.08 C
1967
11.8 C
-0.83 C
1969
12.3 C
-0.33 C
1970
12.5 C
-0.18 C
1972
12.9 C
+0.27 C
1973
12.4 C
-0.24 C
1975
11.6 C
-1.03 C
1976
11.9 C
-0.72 C
1977
11.9 C
-0.74 C
1978
12.2 C
-0.42 C
1979
12.3 C
-0.34 C
1980
12.5 C
-0.12 C
1981
12.7 C
+0.06 C
1982
12.8 C
+0.12 C
1983
12.4 C
-0.22 C
1985
12.7 C
+0.07 C
1986
13.1 C
+0.43 C
1987
13.1 C
+0.47 C
1988
13.2 C
+0.60 C
1989
12.7 C
+0.09 C
1990
13.2 C
+0.53 C
1991
13.4 C
+0.78 C
1999
13.3 C
+0.64 C
2000
13.1 C
+0.45 C
2002
13.3 C
+0.65 C
2003
13.7 C
+1.03 C
The fitted trend in annual mean temperature here over 1943 to 2003 is 0.07 C (-0.03 to 0.16) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.1 to 0.3) per decade. The slope is a straight line fitted to 45 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Lerma
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.07 C (-0.03 to 0.16) per decade
0.1 F (-0.1 to 0.3) per decade
1943 to 2003
45
Not clearly different from zero
Mean daily maximum
-0.03 C (-0.12 to 0.07) per decade
-0.1 F (-0.2 to 0.1) per decade
1943 to 2003
45
Not clearly different from zero
Mean daily minimum
0.16 C (0.01 to 0.32) per decade
0.30 F (0.02 to 0.57) per decade
1943 to 2003
45
Rise
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
1942 to 2007
Yearly extremes at Lerma: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
36.7 C (98.1 F)
1999
27.8 C (82.0 F)
63
Coldest night (TNn)
-11.1 C (12.0 F)
1997
-5.6 C (21.9 F)
63
Wettest day (Rx1day)
96.5 mm (3.8 in)
2001
40.4 mm (1.6 in)
63
Wettest five days (Rx5day)
327.3 mm (12.9 in)
2000
79.2 mm (3.1 in)
63
Longest dry spell (CDD)
110 days
1986
47 days
63
Hottest day (TXx)
The hottest day of the year at Lerma, 1942 to 2007. The record is 36.7 C (98.1 F) in 1999, marked on the chart; the median year is 27.8 C (82.0 F).
Hottest day (TXx) at Lerma by year
Year
Hottest day (TXx)
1942
25.6 C (78.1 F)
1943
30.0 C (86.0 F)
1944
27.2 C (81.0 F)
1946
28.3 C (82.9 F)
1947
27.8 C (82.0 F)
1948
28.9 C (84.0 F)
1949
28.3 C (82.9 F)
1950
27.2 C (81.0 F)
1951
27.2 C (81.0 F)
1952
27.2 C (81.0 F)
1953
28.3 C (82.9 F)
1954
27.8 C (82.0 F)
1955
27.2 C (81.0 F)
1956
25.6 C (78.1 F)
1957
28.9 C (84.0 F)
1958
25.6 C (78.1 F)
1959
27.2 C (81.0 F)
1960
26.7 C (80.1 F)
1961
28.9 C (84.0 F)
1962
25.6 C (78.1 F)
1963
25.6 C (78.1 F)
1964
28.9 C (84.0 F)
1965
25.6 C (78.1 F)
1966
28.9 C (84.0 F)
1967
26.7 C (80.1 F)
1968
26.7 C (80.1 F)
1969
28.9 C (84.0 F)
1970
28.9 C (84.0 F)
1971
31.7 C (89.1 F)
1972
31.7 C (89.1 F)
1973
28.9 C (84.0 F)
1974
28.9 C (84.0 F)
1975
27.8 C (82.0 F)
1976
25.6 C (78.1 F)
1977
28.9 C (84.0 F)
1978
29.4 C (84.9 F)
1979
27.8 C (82.0 F)
1980
28.3 C (82.9 F)
1981
27.2 C (81.0 F)
1982
28.3 C (82.9 F)
1983
32.2 C (90.0 F)
1984
27.8 C (82.0 F)
1985
27.2 C (81.0 F)
1986
28.3 C (82.9 F)
1987
27.8 C (82.0 F)
1988
30.0 C (86.0 F)
1989
28.9 C (84.0 F)
1990
26.7 C (80.1 F)
1991
29.4 C (84.9 F)
1992
27.2 C (81.0 F)
1993
24.4 C (75.9 F)
1995
25.6 C (78.1 F)
1996
31.7 C (89.1 F)
1997
30.6 C (87.1 F)
1998
28.9 C (84.0 F)
1999
36.7 C (98.1 F)
2000
26.7 C (80.1 F)
2001
28.9 C (84.0 F)
2002
28.9 C (84.0 F)
2003
26.7 C (80.1 F)
2004
30.0 C (86.0 F)
2006
23.9 C (75.0 F)
2007
26.7 C (80.1 F)
Coldest night (TNn)
The coldest night of the year at Lerma, 1942 to 2007. The record is -11.1 C (12.0 F) in 1997, marked on the chart; the median year is -5.6 C (21.9 F).
Coldest night (TNn) at Lerma by year
Year
Coldest night (TNn)
1942
-7.2 C (19.0 F)
1943
-6.7 C (19.9 F)
1944
-5.6 C (21.9 F)
1946
-3.9 C (25.0 F)
1947
-2.8 C (27.0 F)
1948
-3.3 C (26.1 F)
1949
-5.0 C (23.0 F)
1950
-5.6 C (21.9 F)
1951
-5.0 C (23.0 F)
1952
-3.9 C (25.0 F)
1953
-5.6 C (21.9 F)
1954
-4.4 C (24.1 F)
1955
-5.0 C (23.0 F)
1956
-5.0 C (23.0 F)
1957
-5.0 C (23.0 F)
1958
-4.4 C (24.1 F)
1959
-5.6 C (21.9 F)
1960
-4.4 C (24.1 F)
1961
-10.0 C (14.0 F)
1962
-10.0 C (14.0 F)
1963
-9.4 C (15.1 F)
1964
-6.1 C (21.0 F)
1965
-8.3 C (17.1 F)
1966
-8.3 C (17.1 F)
1967
-9.4 C (15.1 F)
1968
-8.3 C (17.1 F)
1969
-6.1 C (21.0 F)
1970
-8.3 C (17.1 F)
1971
-9.4 C (15.1 F)
1972
-9.4 C (15.1 F)
1973
-6.1 C (21.0 F)
1974
-7.2 C (19.0 F)
1975
-8.3 C (17.1 F)
1976
-8.9 C (16.0 F)
1977
-6.1 C (21.0 F)
1978
-5.6 C (21.9 F)
1979
-5.0 C (23.0 F)
1980
-7.2 C (19.0 F)
1981
-6.7 C (19.9 F)
1982
-7.8 C (18.0 F)
1983
-8.9 C (16.0 F)
1984
-4.4 C (24.1 F)
1985
-2.2 C (28.0 F)
1986
-2.8 C (27.0 F)
1987
-6.1 C (21.0 F)
1988
-8.3 C (17.1 F)
1989
-6.7 C (19.9 F)
1990
-3.9 C (25.0 F)
1991
-3.3 C (26.1 F)
1992
-5.0 C (23.0 F)
1993
-3.3 C (26.1 F)
1995
-5.0 C (23.0 F)
1996
-8.9 C (16.0 F)
1997
-11.1 C (12.0 F)
1998
-7.2 C (19.0 F)
1999
-5.0 C (23.0 F)
2000
-5.0 C (23.0 F)
2001
-3.3 C (26.1 F)
2002
-6.1 C (21.0 F)
2003
-4.4 C (24.1 F)
2004
-5.0 C (23.0 F)
2006
-6.1 C (21.0 F)
2007
-2.2 C (28.0 F)
Wettest day (Rx1day)
The wettest day of the year at Lerma, 1942 to 2007. The record is 96.5 mm (3.8 in) in 2001, marked on the chart; the median year is 40.4 mm (1.6 in).
Wettest day (Rx1day) at Lerma by year
Year
Wettest day (Rx1day)
1942
21.8 mm (0.9 in)
1943
39.9 mm (1.6 in)
1944
40.4 mm (1.6 in)
1946
37.6 mm (1.5 in)
1947
30.5 mm (1.2 in)
1948
30.0 mm (1.2 in)
1949
23.4 mm (0.9 in)
1950
30.0 mm (1.2 in)
1951
26.9 mm (1.1 in)
1952
29.0 mm (1.1 in)
1953
29.5 mm (1.2 in)
1954
49.8 mm (2.0 in)
1955
33.3 mm (1.3 in)
1956
26.2 mm (1.0 in)
1957
38.6 mm (1.5 in)
1958
48.3 mm (1.9 in)
1959
45.2 mm (1.8 in)
1960
85.9 mm (3.4 in)
1961
40.1 mm (1.6 in)
1962
43.9 mm (1.7 in)
1963
53.6 mm (2.1 in)
1964
51.8 mm (2.0 in)
1965
31.0 mm (1.2 in)
1966
39.9 mm (1.6 in)
1967
52.8 mm (2.1 in)
1968
51.8 mm (2.0 in)
1969
40.4 mm (1.6 in)
1970
39.9 mm (1.6 in)
1971
43.9 mm (1.7 in)
1972
41.7 mm (1.6 in)
1973
53.8 mm (2.1 in)
1974
38.4 mm (1.5 in)
1975
62.0 mm (2.4 in)
1976
27.4 mm (1.1 in)
1977
23.1 mm (0.9 in)
1978
91.2 mm (3.6 in)
1979
39.9 mm (1.6 in)
1980
34.8 mm (1.4 in)
1981
36.8 mm (1.4 in)
1982
42.4 mm (1.7 in)
1983
51.3 mm (2.0 in)
1984
23.9 mm (0.9 in)
1985
60.7 mm (2.4 in)
1986
17.8 mm (0.7 in)
1987
55.9 mm (2.2 in)
1988
45.0 mm (1.8 in)
1989
57.9 mm (2.3 in)
1990
30.5 mm (1.2 in)
1991
42.4 mm (1.7 in)
1992
33.8 mm (1.3 in)
1993
4.1 mm (0.16 in)
1995
34.8 mm (1.4 in)
1996
95.0 mm (3.7 in)
1997
33.8 mm (1.3 in)
1998
95.0 mm (3.7 in)
1999
60.5 mm (2.4 in)
2000
95.0 mm (3.7 in)
2001
96.5 mm (3.8 in)
2002
50.3 mm (2.0 in)
2003
69.9 mm (2.8 in)
2004
59.9 mm (2.4 in)
2006
49.8 mm (2.0 in)
2007
49.8 mm (2.0 in)
Wettest five days (Rx5day)
The wettest five days of the year at Lerma, 1942 to 2007. The record is 327.3 mm (12.9 in) in 2000, marked on the chart; the median year is 79.2 mm (3.1 in).
Wettest five days (Rx5day) at Lerma by year
Year
Wettest five days (Rx5day)
1942
37.5 mm (1.5 in)
1943
85.6 mm (3.4 in)
1944
67.3 mm (2.6 in)
1946
54.9 mm (2.2 in)
1947
65.6 mm (2.6 in)
1948
70.8 mm (2.8 in)
1949
66.3 mm (2.6 in)
1950
64.5 mm (2.5 in)
1951
75.7 mm (3.0 in)
1952
55.9 mm (2.2 in)
1953
58.0 mm (2.3 in)
1954
61.5 mm (2.4 in)
1955
74.4 mm (2.9 in)
1956
61.8 mm (2.4 in)
1957
54.9 mm (2.2 in)
1958
81.0 mm (3.2 in)
1959
70.9 mm (2.8 in)
1960
105.7 mm (4.2 in)
1961
64.5 mm (2.5 in)
1962
70.9 mm (2.8 in)
1963
75.2 mm (3.0 in)
1964
93.2 mm (3.7 in)
1965
71.3 mm (2.8 in)
1966
77.8 mm (3.1 in)
1967
100.3 mm (3.9 in)
1968
92.5 mm (3.6 in)
1969
77.0 mm (3.0 in)
1970
85.7 mm (3.4 in)
1971
87.0 mm (3.4 in)
1972
91.0 mm (3.6 in)
1973
110.2 mm (4.3 in)
1974
72.9 mm (2.9 in)
1975
91.0 mm (3.6 in)
1976
83.7 mm (3.3 in)
1977
60.7 mm (2.4 in)
1978
120.2 mm (4.7 in)
1979
53.8 mm (2.1 in)
1980
86.2 mm (3.4 in)
1981
85.3 mm (3.4 in)
1982
64.8 mm (2.6 in)
1983
98.6 mm (3.9 in)
1984
64.0 mm (2.5 in)
1985
143.3 mm (5.6 in)
1986
62.0 mm (2.4 in)
1987
104.9 mm (4.1 in)
1988
100.9 mm (4.0 in)
1989
94.3 mm (3.7 in)
1990
62.7 mm (2.5 in)
1991
70.4 mm (2.8 in)
1992
85.1 mm (3.4 in)
1993
4.1 mm (0.16 in)
1995
86.7 mm (3.4 in)
1996
242.6 mm (9.6 in)
1997
79.2 mm (3.1 in)
1998
140.2 mm (5.5 in)
1999
181.4 mm (7.1 in)
2000
327.3 mm (12.9 in)
2001
213.6 mm (8.4 in)
2002
90.7 mm (3.6 in)
2003
159.2 mm (6.3 in)
2004
204.9 mm (8.1 in)
2006
63.0 mm (2.5 in)
2007
91.2 mm (3.6 in)
Longest dry spell (CDD)
The longest dry spell of the year at Lerma, 1942 to 2007. The record is 110 days in 1986, marked on the chart; the median year is 47 days.
Longest dry spell (CDD) at Lerma by year
Year
Longest dry spell (CDD)
1942
20 days
1943
80 days
1944
46 days
1946
56 days
1947
45 days
1948
38 days
1949
70 days
1950
43 days
1951
77 days
1952
46 days
1953
109 days
1954
42 days
1955
100 days
1956
41 days
1957
99 days
1958
74 days
1959
41 days
1960
63 days
1961
47 days
1962
84 days
1963
63 days
1964
64 days
1965
51 days
1966
59 days
1967
51 days
1968
29 days
1969
71 days
1970
46 days
1971
36 days
1972
70 days
1973
57 days
1974
40 days
1975
53 days
1976
42 days
1977
63 days
1978
31 days
1979
36 days
1980
69 days
1981
28 days
1982
40 days
1983
56 days
1984
32 days
1985
60 days
1986
110 days
1987
40 days
1988
59 days
1989
53 days
1990
34 days
1991
77 days
1992
24 days
1993
44 days
1995
21 days
1996
47 days
1997
66 days
1998
38 days
1999
59 days
2000
59 days
2001
29 days
2002
16 days
2003
62 days
2004
14 days
2006
40 days
2007
31 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 Lerma falls on 6 April and the median first autumn frost on 8 November, which leaves a median of 212 days between them.
Fitted over all years, the growing season changes by +2.7 days per decade at this station.
Frost dates and growing season at Lerma
Measure
Median, all years
Earliest period
Recent period (1959 to 2003)
Recent against earliest
Fitted trend
Last spring frost
6 April
n/a
7 April
n/a
-1.4 days per decade
First autumn frost
8 November
n/a
11 November
n/a
+1.4 days per decade
Growing days
212 days
n/a
227 days
n/a
+2.7 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
47 years, 1943 to 2000
A day with at least 41.0 mm (1.6 in) of rain is expected about once in 2 years. A day with at least 98.3 mm (3.9 in) of rain is expected about once in 100 years.
Rainfall return levels at Lerma: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
41.0 mm (1.6 in)
5 years
55.2 mm (2.2 in)
10 years
65.0 mm (2.6 in)
25 years
78.0 mm (3.1 in)
50 years
88.0 mm (3.5 in)
Longer than the 47 years of record
100 years
98.3 mm (3.9 in)
Longer than the 47 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, 47 years of values from 1943 to 2000.
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: 95.0 mm (3.7 in) in 2000; 91.2 mm (3.6 in) in 1978; 85.9 mm (3.4 in) in 1960.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Lerma, at 1977. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1977 ran 0.9 C (1.7 F) lower than in the years before (likely change).
Suspected changes in the annual mean temperature at Lerma, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1977
-0.9
-1.7
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 Lerma standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Lerma 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.