Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Chalchihuites (Smn). 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 Chalchihuites (Smn), with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
28.9 C (84.0 F)
-5.0 C (23.0 F)
n/a
n/a
Feb
30.6 C (87.1 F)
-3.3 C (26.1 F)
n/a
n/a
Mar
33.9 C (93.0 F)
-3.3 C (26.1 F)
n/a
n/a
Apr
36.7 C (98.1 F)
-2.2 C (28.0 F)
n/a
n/a
May
38.9 C (102.0 F)
1.1 C (34.0 F)
n/a
n/a
Jun
38.9 C (102.0 F)
3.9 C (39.0 F)
n/a
n/a
Jul
32.8 C (91.0 F)
6.7 C (44.1 F)
n/a
n/a
Aug
32.8 C (91.0 F)
5.6 C (42.1 F)
n/a
n/a
Sep
31.7 C (89.1 F)
5.6 C (42.1 F)
n/a
n/a
Oct
31.1 C (88.0 F)
-2.2 C (28.0 F)
n/a
n/a
Nov
28.9 C (84.0 F)
-7.2 C (19.0 F)
n/a
n/a
Dec
27.8 C (82.0 F)
-5.0 C (23.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Chalchihuites (Smn) still stand. 1982 holds the most, with 81.
Standing records at Chalchihuites (Smn) by the year they were set
Year set
Standing records
1960
17
1966
14
1967
51
1968
46
1969
43
1970
42
1971
12
1972
40
1973
54
1975
8
1976
40
1977
52
1978
30
1979
5
1980
68
1981
36
1982
81
1983
48
1984
53
1985
31
1986
35
1987
41
1988
57
1989
30
1990
1
1991
15
1992
25
1993
34
1994
14
1995
15
1996
32
1997
63
1998
33
1999
11
2000
24
2001
29
2002
11
2005
28
2006
19
2007
31
2009
58
2010
22
2011
16
2012
49
All-Time Record Progression
3 new records
3 all-time records were set at Chalchihuites (Smn) between 16 April 2001 and 28 November 2011. Each dot is a new record.
When Chalchihuites (Smn) set new all-time records
Date
Kind
Detail
2001-04-16
Record high minimum temperature
Record high minimum temperature 20.6 C (69.1 F)
2010-07-01
Record daily precipitation
Record daily precipitation 104.4 mm (4.1 in)
2011-11-28
Record low minimum temperature
Record low minimum temperature -7.2 C (19.0 F)
Wettest Day of Each Month
Jul: 104.4 mm (4.1 in)
The wettest day on record for each calendar month at Chalchihuites (Smn). The most was 104.4 mm (4.1 in) on 1 July 2010.
Record daily precipitation for each month at Chalchihuites (Smn)
Month
Record daily precipitation (mm)
Date
Jan
75.9 mm (3.0 in)
13 January 1987
Feb
30.0 mm (1.2 in)
2 February 2010
Mar
47.0 mm (1.9 in)
4 March 1968
Apr
22.9 mm (0.9 in)
27 April 1981
May
33.8 mm (1.3 in)
30 May 1983
Jun
88.9 mm (3.5 in)
24 June 1986
Jul
104.4 mm (4.1 in)
1 July 2010
Aug
71.9 mm (2.8 in)
27 August 1968
Sep
88.9 mm (3.5 in)
3 September 1968
Oct
44.2 mm (1.7 in)
3 October 1996
Nov
78.0 mm (3.1 in)
26 November 1982
Dec
26.9 mm (1.1 in)
9 December 1986
Period of Record Coverage
1960 to 2012
Complete yearUnder 90 percent of days
45 years of record at Chalchihuites (Smn), 1960 to 2012. 12 years have data for under 90 percent of days and are left out of rankings: 1960, 1966, 1971, 1974, 1975, 1978, 1979, 1990 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 31 complete years at Chalchihuites (Smn), 1967 to 2012. Blue stripes are years cooler than the station's own mean of 16.6 C (61.9 F); red stripes are warmer. The coolest year was 1973, at 14.8 C (58.6 F), and the warmest was 1982, at 18.3 C (65.0 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at Chalchihuites (Smn) as warming stripes, 1967 to 2012
Year
Annual mean temperature
Difference from the station mean
1967
16.3 C
-0.34 C
1968
15.7 C
-0.88 C
1969
16.8 C
+0.19 C
1970
16.4 C
-0.17 C
1972
16.5 C
-0.12 C
1973
14.8 C
-1.82 C
1976
16.2 C
-0.43 C
1977
17.1 C
+0.48 C
1980
17.7 C
+1.05 C
1981
17.1 C
+0.47 C
1982
18.3 C
+1.71 C
1983
17.0 C
+0.41 C
1984
16.5 C
-0.11 C
1985
16.6 C
-0.02 C
1986
16.6 C
-0.02 C
1988
16.6 C
+0.00 C
1989
16.8 C
+0.19 C
1991
17.2 C
+0.63 C
1992
16.4 C
-0.18 C
1993
17.5 C
+0.86 C
1996
16.6 C
+0.02 C
1997
16.3 C
-0.32 C
1998
17.8 C
+1.15 C
1999
17.0 C
+0.39 C
2000
16.9 C
+0.34 C
2005
15.6 C
-0.97 C
2006
16.3 C
-0.35 C
2007
16.0 C
-0.63 C
2009
16.1 C
-0.46 C
2011
16.9 C
+0.34 C
2012
15.1 C
-1.50 C
The fitted trend in annual mean temperature here over 1967 to 2012 is -0.04 C (-0.24 to 0.17) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.1 F (-0.4 to 0.3) per decade. The slope is a straight line fitted to 31 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Chalchihuites (Smn)
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.04 C (-0.24 to 0.17) per decade
-0.1 F (-0.4 to 0.3) per decade
1967 to 2012
31
Not clearly different from zero
Mean daily maximum
0.26 C (-0.03 to 0.56) per decade
0.5 F (-0.1 to 1.0) per decade
1967 to 2012
31
Not clearly different from zero
Mean daily minimum
-0.3 C (-0.5 to -0.2) per decade
-0.6 F (-0.9 to -0.3) per decade
1967 to 2012
31
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
1960 to 2012
Yearly extremes at Chalchihuites (Smn): 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)
1982
35.0 C (95.0 F)
45
Coldest night (TNn)
-7.2 C (19.0 F)
2011
-1.1 C (30.0 F)
45
Wettest day (Rx1day)
104.4 mm (4.1 in)
2010
41.4 mm (1.6 in)
50
Wettest five days (Rx5day)
168.3 mm (6.6 in)
1987
78.7 mm (3.1 in)
50
Longest dry spell (CDD)
146 days
1989
69 days
50
Hottest day (TXx)
The hottest day of the year at Chalchihuites (Smn), 1960 to 2012. The record is 38.9 C (102.0 F) in 1982, marked on the chart; the median year is 35.0 C (95.0 F).
Hottest day (TXx) at Chalchihuites (Smn) by year
Year
Hottest day (TXx)
1960
35.6 C (96.1 F)
1961
n/a
1962
n/a
1963
n/a
1964
n/a
1965
n/a
1966
28.9 C (84.0 F)
1967
32.8 C (91.0 F)
1968
32.8 C (91.0 F)
1969
34.4 C (93.9 F)
1970
32.8 C (91.0 F)
1971
33.3 C (91.9 F)
1972
31.7 C (89.1 F)
1973
32.8 C (91.0 F)
1974
23.3 C (73.9 F)
1975
26.7 C (80.1 F)
1976
35.0 C (95.0 F)
1977
33.9 C (93.0 F)
1978
36.7 C (98.1 F)
1979
25.6 C (78.1 F)
1980
37.8 C (100.0 F)
1981
37.8 C (100.0 F)
1982
38.9 C (102.0 F)
1983
38.9 C (102.0 F)
1984
35.0 C (95.0 F)
1985
36.7 C (98.1 F)
1986
35.6 C (96.1 F)
1987
33.9 C (93.0 F)
1988
35.6 C (96.1 F)
1989
38.9 C (102.0 F)
1990
36.7 C (98.1 F)
1991
35.0 C (95.0 F)
1992
35.6 C (96.1 F)
1993
32.8 C (91.0 F)
1994
32.8 C (91.0 F)
1995
32.8 C (91.0 F)
1996
35.0 C (95.0 F)
1997
35.6 C (96.1 F)
1998
35.6 C (96.1 F)
1999
35.0 C (95.0 F)
2000
35.6 C (96.1 F)
2001
35.0 C (95.0 F)
2002
33.3 C (91.9 F)
2005
38.9 C (102.0 F)
2006
32.8 C (91.0 F)
2007
32.8 C (91.0 F)
2009
33.9 C (93.0 F)
2010
33.9 C (93.0 F)
2011
35.6 C (96.1 F)
2012
30.0 C (86.0 F)
Coldest night (TNn)
The coldest night of the year at Chalchihuites (Smn), 1960 to 2012. The record is -7.2 C (19.0 F) in 2011, marked on the chart; the median year is -1.1 C (30.0 F).
Coldest night (TNn) at Chalchihuites (Smn) by year
Year
Coldest night (TNn)
1960
2.8 C (37.0 F)
1961
n/a
1962
n/a
1963
n/a
1964
n/a
1965
n/a
1966
0.0 C (32.0 F)
1967
-0.6 C (30.9 F)
1968
-3.3 C (26.1 F)
1969
-3.3 C (26.1 F)
1970
-3.3 C (26.1 F)
1971
-0.6 C (30.9 F)
1972
0.0 C (32.0 F)
1973
0.0 C (32.0 F)
1974
0.0 C (32.0 F)
1975
-3.3 C (26.1 F)
1976
-3.3 C (26.1 F)
1977
0.0 C (32.0 F)
1978
-2.2 C (28.0 F)
1979
-1.1 C (30.0 F)
1980
-2.2 C (28.0 F)
1981
0.0 C (32.0 F)
1982
0.0 C (32.0 F)
1983
-1.7 C (28.9 F)
1984
-3.3 C (26.1 F)
1985
0.0 C (32.0 F)
1986
0.0 C (32.0 F)
1987
0.0 C (32.0 F)
1988
0.0 C (32.0 F)
1989
1.7 C (35.1 F)
1990
1.7 C (35.1 F)
1991
0.6 C (33.1 F)
1992
0.0 C (32.0 F)
1993
0.6 C (33.1 F)
1994
2.8 C (37.0 F)
1995
-1.1 C (30.0 F)
1996
-2.2 C (28.0 F)
1997
-5.0 C (23.0 F)
1998
-2.2 C (28.0 F)
1999
0.0 C (32.0 F)
2000
-1.1 C (30.0 F)
2001
-3.3 C (26.1 F)
2002
-3.9 C (25.0 F)
2005
-3.3 C (26.1 F)
2006
-5.0 C (23.0 F)
2007
-4.4 C (24.1 F)
2009
-5.0 C (23.0 F)
2010
-4.4 C (24.1 F)
2011
-7.2 C (19.0 F)
2012
-1.1 C (30.0 F)
Wettest day (Rx1day)
The wettest day of the year at Chalchihuites (Smn), 1960 to 2012. The record is 104.4 mm (4.1 in) in 2010, marked on the chart; the median year is 41.4 mm (1.6 in).
Wettest day (Rx1day) at Chalchihuites (Smn) by year
Year
Wettest day (Rx1day)
1960
91.9 mm (3.6 in)
1961
41.9 mm (1.6 in)
1962
78.0 mm (3.1 in)
1963
57.9 mm (2.3 in)
1964
14.0 mm (0.6 in)
1965
24.4 mm (1.0 in)
1966
53.8 mm (2.1 in)
1967
31.8 mm (1.3 in)
1968
90.9 mm (3.6 in)
1969
32.3 mm (1.3 in)
1970
59.9 mm (2.4 in)
1971
26.9 mm (1.1 in)
1972
42.9 mm (1.7 in)
1973
51.8 mm (2.0 in)
1974
0.0 mm (0.00 in)
1975
11.9 mm (0.5 in)
1976
34.8 mm (1.4 in)
1977
43.9 mm (1.7 in)
1978
30.0 mm (1.2 in)
1979
4.3 mm (0.17 in)
1980
36.8 mm (1.4 in)
1981
51.8 mm (2.0 in)
1982
78.0 mm (3.1 in)
1983
46.0 mm (1.8 in)
1984
59.9 mm (2.4 in)
1985
52.8 mm (2.1 in)
1986
88.9 mm (3.5 in)
1987
75.9 mm (3.0 in)
1988
20.8 mm (0.8 in)
1989
24.9 mm (1.0 in)
1990
91.9 mm (3.6 in)
1991
35.6 mm (1.4 in)
1992
28.4 mm (1.1 in)
1993
32.3 mm (1.3 in)
1994
21.1 mm (0.8 in)
1995
51.3 mm (2.0 in)
1996
76.5 mm (3.0 in)
1997
32.8 mm (1.3 in)
1998
50.8 mm (2.0 in)
1999
22.4 mm (0.9 in)
2000
36.3 mm (1.4 in)
2001
34.3 mm (1.4 in)
2002
15.7 mm (0.6 in)
2005
55.9 mm (2.2 in)
2006
73.4 mm (2.9 in)
2007
31.8 mm (1.3 in)
2009
40.9 mm (1.6 in)
2010
104.4 mm (4.1 in)
2011
45.0 mm (1.8 in)
2012
29.0 mm (1.1 in)
Wettest five days (Rx5day)
The wettest five days of the year at Chalchihuites (Smn), 1960 to 2012. The record is 168.3 mm (6.6 in) in 1987, marked on the chart; the median year is 78.7 mm (3.1 in).
Wettest five days (Rx5day) at Chalchihuites (Smn) by year
Year
Wettest five days (Rx5day)
1960
113.8 mm (4.5 in)
1961
69.6 mm (2.7 in)
1962
95.8 mm (3.8 in)
1963
87.2 mm (3.4 in)
1964
36.1 mm (1.4 in)
1965
36.6 mm (1.4 in)
1966
113.8 mm (4.5 in)
1967
64.7 mm (2.5 in)
1968
152.8 mm (6.0 in)
1969
56.1 mm (2.2 in)
1970
95.4 mm (3.8 in)
1971
73.7 mm (2.9 in)
1972
54.7 mm (2.2 in)
1973
104.3 mm (4.1 in)
1974
0.0 mm (0.00 in)
1975
30.7 mm (1.2 in)
1976
111.3 mm (4.4 in)
1977
79.5 mm (3.1 in)
1978
73.5 mm (2.9 in)
1979
9.4 mm (0.37 in)
1980
52.6 mm (2.1 in)
1981
103.7 mm (4.1 in)
1982
86.9 mm (3.4 in)
1983
100.3 mm (3.9 in)
1984
167.1 mm (6.6 in)
1985
134.4 mm (5.3 in)
1986
117.3 mm (4.6 in)
1987
168.3 mm (6.6 in)
1988
41.4 mm (1.6 in)
1989
53.6 mm (2.1 in)
1990
113.8 mm (4.5 in)
1991
90.2 mm (3.6 in)
1992
61.5 mm (2.4 in)
1993
58.9 mm (2.3 in)
1994
59.0 mm (2.3 in)
1995
90.4 mm (3.6 in)
1996
100.8 mm (4.0 in)
1997
65.5 mm (2.6 in)
1998
66.3 mm (2.6 in)
1999
77.9 mm (3.1 in)
2000
75.9 mm (3.0 in)
2001
91.5 mm (3.6 in)
2002
29.2 mm (1.1 in)
2005
120.7 mm (4.8 in)
2006
96.8 mm (3.8 in)
2007
90.9 mm (3.6 in)
2009
76.0 mm (3.0 in)
2010
115.8 mm (4.6 in)
2011
69.1 mm (2.7 in)
2012
49.6 mm (2.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Chalchihuites (Smn), 1960 to 2012. The record is 146 days in 1989, marked on the chart; the median year is 69 days.
Longest dry spell (CDD) at Chalchihuites (Smn) by year
Year
Longest dry spell (CDD)
1960
92 days
1961
36 days
1962
60 days
1963
57 days
1964
29 days
1965
29 days
1966
31 days
1967
29 days
1968
44 days
1969
101 days
1970
102 days
1971
108 days
1972
88 days
1973
82 days
1974
31 days
1975
70 days
1976
142 days
1977
134 days
1978
46 days
1979
23 days
1980
99 days
1981
44 days
1982
137 days
1983
72 days
1984
68 days
1985
56 days
1986
65 days
1987
72 days
1988
64 days
1989
146 days
1990
53 days
1991
87 days
1992
32 days
1993
62 days
1994
72 days
1995
86 days
1996
53 days
1997
33 days
1998
83 days
1999
138 days
2000
81 days
2001
71 days
2002
32 days
2005
90 days
2006
61 days
2007
56 days
2009
73 days
2010
34 days
2011
80 days
2012
77 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
20 years with a frost
Across 20 years with a frost, the median last spring frost at Chalchihuites (Smn) falls on 7 March and the median first autumn frost on 27 November, which leaves a median of 263 days between them.
Frost dates and growing season at Chalchihuites (Smn)
Measure
Median, all years
Earliest period
Recent period (1967 to 2009)
Recent against earliest
Fitted trend
Last spring frost
7 March
n/a
7 March
n/a
n/a
First autumn frost
27 November
n/a
27 November
n/a
n/a
Growing days
263 days
n/a
263 days
n/a
n/a
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
35 years, 1961 to 2012
A day with at least 45.7 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 111.4 mm (4.4 in) of rain is expected about once in 100 years.
Rainfall return levels at Chalchihuites (Smn): the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
45.7 mm (1.8 in)
5 years
63.4 mm (2.5 in)
10 years
75.0 mm (3.0 in)
25 years
89.7 mm (3.5 in)
50 years
100.6 mm (4.0 in)
Longer than the 35 years of record
100 years
111.4 mm (4.4 in)
Longer than the 35 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, 35 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: 90.9 mm (3.6 in) in 1968; 88.9 mm (3.5 in) in 1986; 78.0 mm (3.1 in) in 1962.
Download the Data
Data for Chalchihuites (Smn) standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Chalchihuites (Smn) 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.