Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Reforma I. 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 Reforma I, 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)
3.9 C (39.0 F)
n/a
n/a
Feb
40.6 C (105.1 F)
5.0 C (41.0 F)
n/a
n/a
Mar
42.2 C (108.0 F)
5.0 C (41.0 F)
n/a
n/a
Apr
42.8 C (109.0 F)
7.8 C (46.0 F)
n/a
n/a
May
41.7 C (107.1 F)
8.3 C (46.9 F)
n/a
n/a
Jun
40.0 C (104.0 F)
11.1 C (52.0 F)
n/a
n/a
Jul
40.6 C (105.1 F)
10.0 C (50.0 F)
n/a
n/a
Aug
41.1 C (106.0 F)
13.9 C (57.0 F)
n/a
n/a
Sep
38.9 C (102.0 F)
8.3 C (46.9 F)
n/a
n/a
Oct
40.6 C (105.1 F)
9.4 C (48.9 F)
n/a
n/a
Nov
38.3 C (100.9 F)
6.1 C (43.0 F)
n/a
n/a
Dec
38.9 C (102.0 F)
6.7 C (44.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Reforma I still stand. 1992 holds the most, with 111.
Standing records at Reforma I by the year they were set
Year set
Standing records
1965
33
1966
47
1967
36
1968
31
1969
54
1970
66
1971
26
1972
48
1973
78
1974
48
1975
29
1976
48
1977
43
1978
35
1979
26
1980
27
1981
43
1982
35
1983
16
1984
38
1985
10
1986
38
1987
103
1988
26
1989
67
1990
28
1991
101
1992
111
1993
38
1994
70
1995
48
1996
16
1997
1
Wettest Day of Each Month
Oct: 300.2 mm (11.8 in)
The wettest day on record for each calendar month at Reforma I. The most was 300.2 mm (11.8 in) on 29 October 1980.
Record daily precipitation for each month at Reforma I
Month
Record daily precipitation (mm)
Date
Jan
160.3 mm (6.3 in)
5 January 1972
Feb
73.7 mm (2.9 in)
18 February 1979
Mar
139.4 mm (5.5 in)
31 March 1976
Apr
64.8 mm (2.6 in)
4 April 1971
May
121.4 mm (4.8 in)
17 May 1969
Jun
110.5 mm (4.4 in)
21 June 1989
Jul
105.9 mm (4.2 in)
13 July 1985
Aug
132.3 mm (5.2 in)
15 August 1993
Sep
202.7 mm (8.0 in)
28 September 1967
Oct
300.2 mm (11.8 in)
29 October 1980
Nov
128.3 mm (5.1 in)
10 November 1977
Dec
178.3 mm (7.0 in)
22 December 1967
Period of Record Coverage
1965 to 1997
Complete yearUnder 90 percent of days
33 years of record at Reforma I, 1965 to 1997. 5 years have data for under 90 percent of days and are left out of rankings: 1965, 1975, 1984, 1988, 1997.
Cooler than the station meanWarmer than the station mean
One stripe for each of 24 complete years at Reforma I, 1966 to 1996. Blue stripes are years cooler than the station's own mean of 25.4 C (77.8 F); red stripes are warmer. The coolest year was 1996, at 24.2 C (75.5 F), and the warmest was 1972, at 26.8 C (80.2 F). The strongest colour marks a difference of 1.4 C (2.5 F).
Annual mean temperature at Reforma I as warming stripes, 1966 to 1996
Year
Annual mean temperature
Difference from the station mean
1966
25.3 C
-0.18 C
1967
25.4 C
-0.04 C
1968
25.3 C
-0.13 C
1969
26.0 C
+0.56 C
1970
25.7 C
+0.28 C
1971
26.2 C
+0.76 C
1972
26.8 C
+1.33 C
1973
26.5 C
+1.06 C
1974
26.1 C
+0.69 C
1976
25.5 C
+0.06 C
1977
26.0 C
+0.60 C
1978
26.1 C
+0.63 C
1979
25.2 C
-0.20 C
1981
24.8 C
-0.69 C
1982
25.5 C
+0.10 C
1983
25.0 C
-0.44 C
1985
24.9 C
-0.56 C
1986
25.3 C
-0.18 C
1987
24.9 C
-0.57 C
1989
25.1 C
-0.37 C
1991
25.2 C
-0.25 C
1992
24.5 C
-0.90 C
1995
25.0 C
-0.40 C
1996
24.2 C
-1.25 C
This station does not have enough complete years (30 are needed) to fit a temperature trend.
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
1965 to 1997
Yearly extremes at Reforma I: 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)
1995
40.6 C (105.1 F)
33
Coldest night (TNn)
3.9 C (39.0 F)
1986
8.9 C (48.0 F)
33
Wettest day (Rx1day)
300.2 mm (11.8 in)
1980
102.1 mm (4.0 in)
33
Wettest five days (Rx5day)
441.5 mm (17.4 in)
1967
220.5 mm (8.7 in)
33
Longest dry spell (CDD)
105 days
1989
46 days
33
Hottest day (TXx)
The hottest day of the year at Reforma I, 1965 to 1997. The record is 42.8 C (109.0 F) in 1995, marked on the chart; the median year is 40.6 C (105.1 F).
Hottest day (TXx) at Reforma I by year
Year
Hottest day (TXx)
1965
38.9 C (102.0 F)
1966
37.8 C (100.0 F)
1967
39.4 C (102.9 F)
1968
38.9 C (102.0 F)
1969
40.6 C (105.1 F)
1970
39.4 C (102.9 F)
1971
40.6 C (105.1 F)
1972
40.0 C (104.0 F)
1973
41.1 C (106.0 F)
1974
40.6 C (105.1 F)
1975
41.7 C (107.1 F)
1976
40.0 C (104.0 F)
1977
38.9 C (102.0 F)
1978
40.6 C (105.1 F)
1979
39.4 C (102.9 F)
1980
40.6 C (105.1 F)
1981
38.9 C (102.0 F)
1982
37.8 C (100.0 F)
1983
41.7 C (107.1 F)
1984
41.7 C (107.1 F)
1985
40.0 C (104.0 F)
1986
41.1 C (106.0 F)
1987
42.2 C (108.0 F)
1988
41.7 C (107.1 F)
1989
40.6 C (105.1 F)
1990
40.6 C (105.1 F)
1991
40.0 C (104.0 F)
1992
41.1 C (106.0 F)
1993
41.7 C (107.1 F)
1994
42.2 C (108.0 F)
1995
42.8 C (109.0 F)
1996
39.4 C (102.9 F)
1997
38.9 C (102.0 F)
Coldest night (TNn)
The coldest night of the year at Reforma I, 1965 to 1997. The record is 3.9 C (39.0 F) in 1986, marked on the chart; the median year is 8.9 C (48.0 F).
Coldest night (TNn) at Reforma I by year
Year
Coldest night (TNn)
1965
15.0 C (59.0 F)
1966
10.6 C (51.1 F)
1967
11.1 C (52.0 F)
1968
10.6 C (51.1 F)
1969
13.9 C (57.0 F)
1970
11.1 C (52.0 F)
1971
9.4 C (48.9 F)
1972
11.7 C (53.1 F)
1973
12.2 C (54.0 F)
1974
12.8 C (55.0 F)
1975
13.9 C (57.0 F)
1976
8.9 C (48.0 F)
1977
12.2 C (54.0 F)
1978
12.2 C (54.0 F)
1979
10.6 C (51.1 F)
1980
8.3 C (46.9 F)
1981
10.0 C (50.0 F)
1982
7.8 C (46.0 F)
1983
5.0 C (41.0 F)
1984
7.2 C (45.0 F)
1985
6.7 C (44.1 F)
1986
3.9 C (39.0 F)
1987
5.0 C (41.0 F)
1988
6.7 C (44.1 F)
1989
5.0 C (41.0 F)
1990
6.7 C (44.1 F)
1991
5.6 C (42.1 F)
1992
7.8 C (46.0 F)
1993
5.0 C (41.0 F)
1994
6.1 C (43.0 F)
1995
7.8 C (46.0 F)
1996
5.6 C (42.1 F)
1997
10.0 C (50.0 F)
Wettest day (Rx1day)
The wettest day of the year at Reforma I, 1965 to 1997. The record is 300.2 mm (11.8 in) in 1980, marked on the chart; the median year is 102.1 mm (4.0 in).
Wettest day (Rx1day) at Reforma I by year
Year
Wettest day (Rx1day)
1965
190.8 mm (7.5 in)
1966
129.0 mm (5.1 in)
1967
202.7 mm (8.0 in)
1968
101.6 mm (4.0 in)
1969
121.4 mm (4.8 in)
1970
108.2 mm (4.3 in)
1971
91.4 mm (3.6 in)
1972
162.3 mm (6.4 in)
1973
113.3 mm (4.5 in)
1974
95.3 mm (3.8 in)
1975
41.7 mm (1.6 in)
1976
139.4 mm (5.5 in)
1977
128.3 mm (5.1 in)
1978
89.7 mm (3.5 in)
1979
106.7 mm (4.2 in)
1980
300.2 mm (11.8 in)
1981
140.0 mm (5.5 in)
1982
70.4 mm (2.8 in)
1983
69.6 mm (2.7 in)
1984
87.9 mm (3.5 in)
1985
105.9 mm (4.2 in)
1986
90.2 mm (3.6 in)
1987
89.2 mm (3.5 in)
1988
23.4 mm (0.9 in)
1989
146.6 mm (5.8 in)
1990
122.2 mm (4.8 in)
1991
100.3 mm (3.9 in)
1992
102.1 mm (4.0 in)
1993
132.3 mm (5.2 in)
1994
90.7 mm (3.6 in)
1995
74.2 mm (2.9 in)
1996
101.3 mm (4.0 in)
1997
7.1 mm (0.28 in)
Wettest five days (Rx5day)
The wettest five days of the year at Reforma I, 1965 to 1997. The record is 441.5 mm (17.4 in) in 1967, marked on the chart; the median year is 220.5 mm (8.7 in).
Wettest five days (Rx5day) at Reforma I by year
Year
Wettest five days (Rx5day)
1965
309.4 mm (12.2 in)
1966
259.9 mm (10.2 in)
1967
441.5 mm (17.4 in)
1968
166.4 mm (6.6 in)
1969
213.2 mm (8.4 in)
1970
258.6 mm (10.2 in)
1971
191.1 mm (7.5 in)
1972
242.1 mm (9.5 in)
1973
304.5 mm (12.0 in)
1974
191.9 mm (7.6 in)
1975
41.7 mm (1.6 in)
1976
197.6 mm (7.8 in)
1977
190.8 mm (7.5 in)
1978
129.5 mm (5.1 in)
1979
234.0 mm (9.2 in)
1980
390.9 mm (15.4 in)
1981
269.5 mm (10.6 in)
1982
163.5 mm (6.4 in)
1983
170.1 mm (6.7 in)
1984
191.5 mm (7.5 in)
1985
220.5 mm (8.7 in)
1986
264.4 mm (10.4 in)
1987
235.1 mm (9.3 in)
1988
38.9 mm (1.5 in)
1989
296.7 mm (11.7 in)
1990
288.6 mm (11.4 in)
1991
204.2 mm (8.0 in)
1992
224.0 mm (8.8 in)
1993
365.1 mm (14.4 in)
1994
141.2 mm (5.6 in)
1995
205.5 mm (8.1 in)
1996
239.2 mm (9.4 in)
1997
7.1 mm (0.28 in)
Longest dry spell (CDD)
The longest dry spell of the year at Reforma I, 1965 to 1997. The record is 105 days in 1989, marked on the chart; the median year is 46 days.
Longest dry spell (CDD) at Reforma I by year
Year
Longest dry spell (CDD)
1965
27 days
1966
15 days
1967
34 days
1968
16 days
1969
37 days
1970
25 days
1971
52 days
1972
29 days
1973
17 days
1974
37 days
1975
50 days
1976
32 days
1977
46 days
1978
37 days
1979
40 days
1980
66 days
1981
44 days
1982
36 days
1983
46 days
1984
59 days
1985
57 days
1986
78 days
1987
95 days
1988
76 days
1989
105 days
1990
64 days
1991
68 days
1992
55 days
1993
77 days
1994
95 days
1995
57 days
1996
105 days
1997
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.
Download the Data
Data for Reforma I standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Reforma I 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.