Reforma I Weather Records (MXN00007138)

Record envelope, standing records and threshold days for Reforma I (MXN00007138), Mexico, with 33 years of record.

Key Facts for Reforma I

Reforma I (MXN00007138) is a weather station in Mexico at 17.87 latitude and -93.13 longitude, 20 m (65 ft) above sea level.
The station reports from 1965 to 1997, 33 years of record.
1,464 records set at Reforma I still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Reforma I set a daily record high maximum temperature of 37.2 C (99.0 F) on 2 March 1997.

About the Station

Location: Mexico, 17.87 latitude, -93.13 longitude.
Elevation: 20 m (65 ft).
Period of record: 1965 to 1997, 33 years.
Eligible elements: tmax, tmin, prcp.

Daily Record Envelope and 2026

0 days at or beyond a record

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

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

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.

Days with data per year at Reforma I
Year	Days with data	Share of year	Complete
1965	275	75%	No
1966	365	100%	Yes
1967	364	100%	Yes
1968	366	100%	Yes
1969	365	100%	Yes
1970	365	100%	Yes
1971	365	100%	Yes
1972	364	99%	Yes
1973	362	99%	Yes
1974	364	100%	Yes
1975	182	50%	No
1976	365	100%	Yes
1977	364	100%	Yes
1978	363	99%	Yes
1979	365	100%	Yes
1980	335	92%	Yes
1981	365	100%	Yes
1982	365	100%	Yes
1983	365	100%	Yes
1984	321	88%	No
1985	365	100%	Yes
1986	365	100%	Yes
1987	365	100%	Yes
1988	183	50%	No
1989	365	100%	Yes
1990	365	100%	Yes
1991	365	100%	Yes
1992	365	100%	Yes
1993	365	100%	Yes
1994	333	91%	Yes
1995	365	100%	Yes
1996	365	100%	Yes
1997	62	17%	No

Latest Records

Latest records at Reforma I
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
2 March 1997	Reforma I, MX	daily high max	37.2 C (99.0 F)	0.5 C (0.9 F)	2 years	4 of 100 (Routine)
1 March 1997	Reforma I, MX	daily high max (Tie)	37.8 C (100.0 F)	tie	2 years	0 of 100 (Routine)
5 January 1997	Reforma I, MX	daily high max (Tie)	35.0 C (95.0 F)	tie	9 years	1 of 100 (Routine)
11 November 1996	Reforma I, MX	daily low min (Tie)	10.0 C (50.0 F)	tie	5 years	1 of 100 (Routine)
9 November 1996	Reforma I, MX	daily low max	25.0 C (77.0 F)	2.2 C (4.0 F)	29 years	17 of 100 (Routine)
20 September 1996	Reforma I, MX	daily rain	62.5 mm (2.5 in)	29.7 mm (1.2 in)	30 years	24 of 100 (Routine)
22 August 1996	Reforma I, MX	daily rain	56.4 mm (2.2 in)	13.7 mm (0.5 in)	11 years	12 of 100 (Routine)
19 August 1996	Reforma I, MX	daily rain	88.4 mm (3.5 in)	18.5 mm (0.7 in)	3 years	11 of 100 (Routine)
14 August 1996	Reforma I, MX	daily low max	30.0 C (86.0 F)	0.6 C (1.1 F)	31 years	15 of 100 (Routine)
11 August 1996	Reforma I, MX	daily low max	30.6 C (87.1 F)	0.5 C (0.9 F)	27 years	13 of 100 (Routine)
10 August 1996	Reforma I, MX	daily low max	28.9 C (84.0 F)	1.1 C (2.0 F)	27 years	16 of 100 (Routine)
9 August 1996	Reforma I, MX	daily rain	86.6 mm (3.4 in)	25.9 mm (1.0 in)	4 years	15 of 100 (Routine)
9 August 1996	Reforma I, MX	daily low max (Tie)	30.6 C (87.1 F)	tie	27 years	2 of 100 (Routine)
8 August 1996	Reforma I, MX	daily rain	101.3 mm (4.0 in)	78.9 mm (3.1 in)	22 years	45 of 100 (Notable)
1 August 1996	Reforma I, MX	daily low max (Tie)	30.0 C (86.0 F)	tie	12 years	1 of 100 (Routine)
30 July 1996	Reforma I, MX	daily low max (Tie)	30.0 C (86.0 F)	tie	15 years	1 of 100 (Routine)
29 July 1996	Reforma I, MX	daily low max (Tie)	30.0 C (86.0 F)	tie	15 years	1 of 100 (Routine)
20 July 1996	Reforma I, MX	daily low max (Tie)	30.0 C (86.0 F)	tie	14 years	1 of 100 (Routine)
19 July 1996	Reforma I, MX	daily low max	29.4 C (84.9 F)	0.6 C (1.1 F)	15 years	9 of 100 (Routine)
4 July 1996	Reforma I, MX	daily low max	30.0 C (86.0 F)	0.6 C (1.1 F)	26 years	12 of 100 (Routine)

Climate Trend

24 complete years, 1966 to 1996

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 2026-10-17 (17 October 2026). Records are computed by this site and are not official.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).