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Reforma II Weather Records (MXN00007226)

Record envelope, standing records and threshold days for Reforma II (MXN00007226), Mexico, with 34 years of record.

Key Facts for Reforma II

  • Reforma II (MXN00007226) is a weather station in Mexico at 15.90 latitude and -92.93 longitude, 700 m (2,296 ft) above sea level.
  • The station reports from 1975 to 2008, 34 years of record.
  • 1,464 records set at Reforma II still stand.
  • Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
  • Reforma II set a daily record low maximum temperature of 21.1 C (70.0 F) on 12 December 2008.

About the Station

  • Location: Mexico, 15.90 latitude, -92.93 longitude.
  • Elevation: 700 m (2,296 ft).
  • Period of record: 1975 to 2008, 34 years.
  • Eligible elements: tmax, tmin, prcp.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Reforma II, with 2026 drawn through them The band shows the record high and record low for each calendar day at Reforma II. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. 01020304050 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Reforma II. 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 II, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan38.3 C (100.9 F)3.9 C (39.0 F)n/an/a
Feb40.6 C (105.1 F)5.0 C (41.0 F)n/an/a
Mar42.2 C (108.0 F)5.0 C (41.0 F)n/an/a
Apr42.8 C (109.0 F)7.8 C (46.0 F)n/an/a
May41.7 C (107.1 F)6.1 C (43.0 F)n/an/a
Jun42.2 C (108.0 F)11.1 C (52.0 F)n/an/a
Jul40.6 C (105.1 F)10.0 C (50.0 F)n/an/a
Aug41.1 C (106.0 F)13.9 C (57.0 F)n/an/a
Sep38.9 C (102.0 F)12.8 C (55.0 F)n/an/a
Oct40.6 C (105.1 F)10.0 C (50.0 F)n/an/a
Nov40.0 C (104.0 F)6.1 C (43.0 F)n/an/a
Dec38.9 C (102.0 F)6.7 C (44.1 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Reforma II by the year they were set 1,464 records at Reforma II still stand. 1976 holds the most, with 232. 01002003001975: 181976: 2321977: 791978: 351979: 311980: 401981: 291982: 191983: 441984: 331985: 141986: 511987: 1061988: 331989: 611990: 321991: 1161992: 1051993: 351994: 701995: 521996: 241997: 121998: 151999: 212000: 152001: 102002: 142003: 212004: 102005: 152006: 222007: 232008: 27197519791983198719911995199920032007
1,464 records at Reforma II still stand. 1976 holds the most, with 232.
Standing records at Reforma II by the year they were set
Year setStanding records
197518
1976232
197779
197835
197931
198040
198129
198219
198344
198433
198514
198651
1987106
198833
198961
199032
1991116
1992105
199335
199470
199552
199624
199712
199815
199921
200015
200110
200214
200321
200410
200515
200622
200723
200827

Wettest Day of Each Month

Jun: 159.8 mm (6.3 in)
Record daily precipitation for each month at Reforma II The wettest day on record for each calendar month at Reforma II. The most was 159.8 mm (6.3 in) on 13 June 1995. 050100150200 Jan: 38.4 mm (1.5 in), 4 January 1985 Jan Feb: 54.6 mm (2.1 in), 20 February 1982 Feb Mar: 62.7 mm (2.5 in), 27 March 1990 Mar Apr: 67.3 mm (2.6 in), 30 April 1976 Apr May: 135.9 mm (5.4 in), 23 May 2006 May Jun: 159.8 mm (6.3 in), 13 June 1995 Jun Jul: 140.0 mm (5.5 in), 14 July 2008 Jul Aug: 132.3 mm (5.2 in), 15 August 1993 Aug Sep: 146.6 mm (5.8 in), 5 September 1989 Sep Oct: 149.4 mm (5.9 in), 19 October 1999 Oct Nov: 105.4 mm (4.1 in), 21 November 1976 Nov Dec: 59.9 mm (2.4 in), 31 December 1990 Dec
The wettest day on record for each calendar month at Reforma II. The most was 159.8 mm (6.3 in) on 13 June 1995.
Record daily precipitation for each month at Reforma II
MonthRecord daily precipitation (mm)Date
Jan38.4 mm (1.5 in)4 January 1985
Feb54.6 mm (2.1 in)20 February 1982
Mar62.7 mm (2.5 in)27 March 1990
Apr67.3 mm (2.6 in)30 April 1976
May135.9 mm (5.4 in)23 May 2006
Jun159.8 mm (6.3 in)13 June 1995
Jul140.0 mm (5.5 in)14 July 2008
Aug132.3 mm (5.2 in)15 August 1993
Sep146.6 mm (5.8 in)5 September 1989
Oct149.4 mm (5.9 in)19 October 1999
Nov105.4 mm (4.1 in)21 November 1976
Dec59.9 mm (2.4 in)31 December 1990

Period of Record Coverage

1975 to 2008
Days with data per year at Reforma II 34 years of record at Reforma II, 1975 to 2008. 7 years have data for under 90 percent of days and are left out of rankings: 1975, 1988, 1999, 2002, 2004, 2005, 2006. 1975: 213 of 365 days1976: 359 of 366 days1977: 334 of 365 days1978: 365 of 365 days1979: 335 of 365 days1980: 365 of 366 days1981: 365 of 365 days1982: 365 of 365 days1983: 364 of 365 days1984: 333 of 366 days1985: 362 of 365 days1986: 357 of 365 days1987: 364 of 365 days1988: 182 of 366 days1989: 363 of 365 days1990: 364 of 365 days1991: 364 of 365 days1992: 365 of 366 days1993: 365 of 365 days1994: 329 of 365 days1995: 363 of 365 days1996: 365 of 366 days1997: 336 of 365 days1998: 333 of 365 days1999: 322 of 365 days2000: 349 of 366 days2001: 362 of 365 days2002: 327 of 365 days2003: 358 of 365 days2004: 328 of 366 days2005: 272 of 365 days2006: 295 of 365 days2007: 336 of 365 days2008: 360 of 366 days1975198019851990199520002005
34 years of record at Reforma II, 1975 to 2008. 7 years have data for under 90 percent of days and are left out of rankings: 1975, 1988, 1999, 2002, 2004, 2005, 2006.
Days with data per year at Reforma II
YearDays with dataShare of yearComplete
197521358%No
197635998%Yes
197733492%Yes
1978365100%Yes
197933592%Yes
1980365100%Yes
1981365100%Yes
1982365100%Yes
1983364100%Yes
198433391%Yes
198536299%Yes
198635798%Yes
1987364100%Yes
198818250%No
198936399%Yes
1990364100%Yes
1991364100%Yes
1992365100%Yes
1993365100%Yes
199432990%Yes
199536399%Yes
1996365100%Yes
199733692%Yes
199833391%Yes
199932288%No
200034995%Yes
200136299%Yes
200232790%No
200335898%Yes
200432890%No
200527275%No
200629581%No
200733692%Yes
200836098%Yes

Latest Records

20
Latest records at Reforma II
DateStationRecordValueBeat old record byOld record stoodSignificance
12 December 2008Reforma II, MXdaily low max21.1 C (70.0 F)4.5 C (8.1 F)30 years26 of 100 (Routine)
11 December 2008Reforma II, MXdaily low max21.7 C (71.1 F)1.6 C (2.9 F)32 years16 of 100 (Routine)
5 December 2008Reforma II, MXdaily low max25.6 C (78.1 F)1.6 C (2.9 F)32 years16 of 100 (Routine)
3 December 2008Reforma II, MXdaily low min (Tie)10.0 C (50.0 F)tie9 years1 of 100 (Routine)
1 December 2008Reforma II, MXdaily rain3.6 mm (0.14 in)3.6 mm (0.14 in)33 years14 of 100 (Routine)
22 November 2008Reforma II, MXdaily low min10.0 C (50.0 F)0.6 C (1.1 F)2 years5 of 100 (Routine)
21 November 2008Reforma II, MXdaily low min (Tie)11.7 C (53.1 F)tie16 years1 of 100 (Routine)
16 November 2008Reforma II, MXdaily low max21.7 C (71.1 F)1.1 C (2.0 F)2 years6 of 100 (Routine)
3 November 2008Reforma II, MXdaily low min11.1 C (52.0 F)1.7 C (3.1 F)9 years11 of 100 (Routine)
2 November 2008Reforma II, MXdaily low min13.3 C (55.9 F)1.7 C (3.1 F)17 years14 of 100 (Routine)
31 October 2008Reforma II, MXdaily low min (Tie)13.3 C (55.9 F)tie15 years1 of 100 (Routine)
30 October 2008Reforma II, MXdaily low min (Tie)12.8 C (55.0 F)tie15 years1 of 100 (Routine)
16 October 2008Reforma II, MXdaily high min21.1 C (70.0 F)0.5 C (0.9 F)9 years7 of 100 (Routine)
15 October 2008Reforma II, MXdaily rain47.8 mm (1.9 in)33.3 mm (1.3 in)26 years26 of 100 (Routine)
15 October 2008Reforma II, MXdaily high min (Tie)21.7 C (71.1 F)tie2 years0 of 100 (Routine)
5 October 2008Reforma II, MXdaily low max (Tie)28.9 C (84.0 F)tie32 years3 of 100 (Routine)
1 October 2008Reforma II, MXdaily low max (Tie)25.0 C (77.0 F)tie16 years1 of 100 (Routine)
30 September 2008Reforma II, MXdaily low max23.3 C (73.9 F)0.6 C (1.1 F)8 years7 of 100 (Routine)
28 September 2008Reforma II, MXdaily low max23.9 C (75.0 F)0.5 C (0.9 F)16 years9 of 100 (Routine)
27 September 2008Reforma II, MXdaily low max (Tie)25.0 C (77.0 F)tie16 years1 of 100 (Routine)

Climate Trend

21 complete years, 1976 to 2008
Annual mean temperature at Reforma II as warming stripes, 1976 to 2008 One stripe for each of 21 complete years at Reforma II, 1976 to 2008. Blue stripes are years cooler than the station's own mean of 24.8 C (76.7 F); red stripes are warmer. The coolest year was 1976, at 23.3 C (73.9 F), and the warmest was 1990, at 25.5 C (77.9 F). The strongest colour marks a difference of 1.6 C (2.9 F). 1976: 23.3 C, -1.6 C from the station mean1978: 24.8 C, 0.0 C from the station mean1980: 25.1 C, +0.3 C from the station mean1981: 24.9 C, 0.0 C from the station mean1982: 25.0 C, +0.1 C from the station mean1983: 25.0 C, +0.2 C from the station mean1985: 24.9 C, 0.0 C from the station mean1986: 25.3 C, +0.4 C from the station mean1987: 24.9 C, +0.1 C from the station mean1989: 25.1 C, +0.3 C from the station mean1990: 25.5 C, +0.7 C from the station mean1991: 25.2 C, +0.3 C from the station mean1992: 24.6 C, -0.2 C from the station mean1993: 25.1 C, +0.3 C from the station mean1995: 25.1 C, +0.2 C from the station mean1996: 24.2 C, -0.6 C from the station mean2000: 24.2 C, -0.6 C from the station mean2001: 24.8 C, -0.1 C from the station mean2003: 25.1 C, +0.3 C from the station mean2007: 25.0 C, +0.2 C from the station mean2008: 24.6 C, -0.2 C from the station mean1976198019851990199520002005
One stripe for each of 21 complete years at Reforma II, 1976 to 2008. Blue stripes are years cooler than the station's own mean of 24.8 C (76.7 F); red stripes are warmer. The coolest year was 1976, at 23.3 C (73.9 F), and the warmest was 1990, at 25.5 C (77.9 F). The strongest colour marks a difference of 1.6 C (2.9 F).
Annual mean temperature at Reforma II as warming stripes, 1976 to 2008
YearAnnual mean temperatureDifference from the station mean
197623.3 C-1.58 C
197824.8 C-0.01 C
198025.1 C+0.26 C
198124.9 C+0.02 C
198225.0 C+0.14 C
198325.0 C+0.17 C
198524.9 C+0.03 C
198625.3 C+0.42 C
198724.9 C+0.06 C
198925.1 C+0.26 C
199025.5 C+0.65 C
199125.2 C+0.33 C
199224.6 C-0.20 C
199325.1 C+0.26 C
199525.1 C+0.22 C
199624.2 C-0.64 C
200024.2 C-0.64 C
200124.8 C-0.07 C
200325.1 C+0.29 C
200725.0 C+0.19 C
200824.6 C-0.21 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

1975 to 2008
Yearly extremes at Reforma II: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)42.8 C (109.0 F)199540.3 C (104.5 F)34
Coldest night (TNn)3.9 C (39.0 F)19867.2 C (45.0 F)34
Wettest day (Rx1day)159.8 mm (6.3 in)1995104.5 mm (4.1 in)34
Wettest five days (Rx5day)365.1 mm (14.4 in)1993213.6 mm (8.4 in)34
Longest dry spell (CDD)151 days199865 days34

Hottest day (TXx)

Hottest day (TXx) at Reforma II by year The hottest day of the year at Reforma II, 1975 to 2008. The record is 42.8 C (109.0 F) in 1995, marked on the chart; the median year is 40.3 C (104.5 F). 343638404244198019902000Record: 42.8 C (109.0 F) in 1995
The hottest day of the year at Reforma II, 1975 to 2008. The record is 42.8 C (109.0 F) in 1995, marked on the chart; the median year is 40.3 C (104.5 F).
Hottest day (TXx) at Reforma II by year
YearHottest day (TXx)
197535.0 C (95.0 F)
197639.4 C (102.9 F)
197740.0 C (104.0 F)
197840.0 C (104.0 F)
197939.4 C (102.9 F)
198040.6 C (105.1 F)
198141.1 C (106.0 F)
198240.0 C (104.0 F)
198341.7 C (107.1 F)
198441.7 C (107.1 F)
198540.0 C (104.0 F)
198641.1 C (106.0 F)
198742.2 C (108.0 F)
198841.7 C (107.1 F)
198940.6 C (105.1 F)
199040.6 C (105.1 F)
199140.0 C (104.0 F)
199242.2 C (108.0 F)
199341.7 C (107.1 F)
199442.2 C (108.0 F)
199542.8 C (109.0 F)
199639.4 C (102.9 F)
199740.0 C (104.0 F)
199841.1 C (106.0 F)
199939.4 C (102.9 F)
200039.4 C (102.9 F)
200138.9 C (102.0 F)
200239.4 C (102.9 F)
200340.6 C (105.1 F)
200440.6 C (105.1 F)
200538.9 C (102.0 F)
200640.0 C (104.0 F)
200741.7 C (107.1 F)
200840.0 C (104.0 F)

Coldest night (TNn)

Coldest night (TNn) at Reforma II by year The coldest night of the year at Reforma II, 1975 to 2008. The record is 3.9 C (39.0 F) in 1986, marked on the chart; the median year is 7.2 C (45.0 F). 246810198019902000Record: 3.9 C (39.0 F) in 1986
The coldest night of the year at Reforma II, 1975 to 2008. The record is 3.9 C (39.0 F) in 1986, marked on the chart; the median year is 7.2 C (45.0 F).
Coldest night (TNn) at Reforma II by year
YearColdest night (TNn)
19757.2 C (45.0 F)
19765.0 C (41.0 F)
19777.2 C (45.0 F)
19787.2 C (45.0 F)
19799.4 C (48.9 F)
19807.2 C (45.0 F)
19815.0 C (41.0 F)
19827.8 C (46.0 F)
19835.0 C (41.0 F)
19847.2 C (45.0 F)
19856.7 C (44.1 F)
19863.9 C (39.0 F)
19875.0 C (41.0 F)
19886.7 C (44.1 F)
19895.0 C (41.0 F)
19906.7 C (44.1 F)
19915.6 C (42.1 F)
19927.8 C (46.0 F)
19935.0 C (41.0 F)
19946.1 C (43.0 F)
19957.8 C (46.0 F)
19965.6 C (42.1 F)
19977.2 C (45.0 F)
19986.7 C (44.1 F)
19997.2 C (45.0 F)
20008.3 C (46.9 F)
20017.8 C (46.0 F)
20025.6 C (42.1 F)
20037.8 C (46.0 F)
200410.0 C (50.0 F)
200510.0 C (50.0 F)
20068.9 C (48.0 F)
200710.0 C (50.0 F)
20088.3 C (46.9 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Reforma II by year The wettest day of the year at Reforma II, 1975 to 2008. The record is 159.8 mm (6.3 in) in 1995, marked on the chart; the median year is 104.5 mm (4.1 in). 050100150200198019902000Record: 159.8 mm (6.3 in) in 1995
The wettest day of the year at Reforma II, 1975 to 2008. The record is 159.8 mm (6.3 in) in 1995, marked on the chart; the median year is 104.5 mm (4.1 in).
Wettest day (Rx1day) at Reforma II by year
YearWettest day (Rx1day)
197577.0 mm (3.0 in)
1976105.4 mm (4.1 in)
197785.1 mm (3.4 in)
197881.3 mm (3.2 in)
1979106.7 mm (4.2 in)
198082.6 mm (3.3 in)
1981140.5 mm (5.5 in)
198270.4 mm (2.8 in)
1983107.2 mm (4.2 in)
198487.9 mm (3.5 in)
1985105.9 mm (4.2 in)
198690.2 mm (3.6 in)
198789.2 mm (3.5 in)
198823.4 mm (0.9 in)
1989146.6 mm (5.8 in)
1990127.0 mm (5.0 in)
1991100.6 mm (4.0 in)
1992102.1 mm (4.0 in)
1993132.3 mm (5.2 in)
1994119.9 mm (4.7 in)
1995159.8 mm (6.3 in)
1996101.3 mm (4.0 in)
1997103.6 mm (4.1 in)
199891.2 mm (3.6 in)
1999149.4 mm (5.9 in)
2000119.9 mm (4.7 in)
2001113.5 mm (4.5 in)
2002113.5 mm (4.5 in)
200372.4 mm (2.9 in)
200494.5 mm (3.7 in)
2005147.1 mm (5.8 in)
2006135.9 mm (5.4 in)
200776.5 mm (3.0 in)
2008140.0 mm (5.5 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Reforma II by year The wettest five days of the year at Reforma II, 1975 to 2008. The record is 365.1 mm (14.4 in) in 1993, marked on the chart; the median year is 213.6 mm (8.4 in). 0100200300400198019902000Record: 365.1 mm (14.4 in) in 1993
The wettest five days of the year at Reforma II, 1975 to 2008. The record is 365.1 mm (14.4 in) in 1993, marked on the chart; the median year is 213.6 mm (8.4 in).
Wettest five days (Rx5day) at Reforma II by year
YearWettest five days (Rx5day)
1975185.1 mm (7.3 in)
1976200.9 mm (7.9 in)
1977210.9 mm (8.3 in)
1978190.4 mm (7.5 in)
1979219.7 mm (8.6 in)
1980158.8 mm (6.3 in)
1981226.6 mm (8.9 in)
1982163.5 mm (6.4 in)
1983216.2 mm (8.5 in)
1984191.5 mm (7.5 in)
1985220.5 mm (8.7 in)
1986264.4 mm (10.4 in)
1987235.1 mm (9.3 in)
198838.9 mm (1.5 in)
1989296.5 mm (11.7 in)
1990288.6 mm (11.4 in)
1991204.2 mm (8.0 in)
1992224.0 mm (8.8 in)
1993365.1 mm (14.4 in)
1994194.3 mm (7.6 in)
1995205.5 mm (8.1 in)
1996239.2 mm (9.4 in)
1997172.5 mm (6.8 in)
1998183.2 mm (7.2 in)
1999218.8 mm (8.6 in)
2000254.8 mm (10.0 in)
2001205.0 mm (8.1 in)
2002218.7 mm (8.6 in)
2003165.6 mm (6.5 in)
2004167.7 mm (6.6 in)
2005269.0 mm (10.6 in)
2006208.3 mm (8.2 in)
2007238.0 mm (9.4 in)
2008233.2 mm (9.2 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Reforma II by year The longest dry spell of the year at Reforma II, 1975 to 2008. The record is 151 days in 1998, marked on the chart; the median year is 65 days. 050100150200198019902000Record: 151 days in 1998
The longest dry spell of the year at Reforma II, 1975 to 2008. The record is 151 days in 1998, marked on the chart; the median year is 65 days.
Longest dry spell (CDD) at Reforma II by year
YearLongest dry spell (CDD)
197550 days
197655 days
197779 days
197874 days
197989 days
198066 days
198167 days
198248 days
198346 days
198459 days
198557 days
198678 days
198795 days
198876 days
1989105 days
199064 days
199168 days
199255 days
199377 days
199495 days
199557 days
1996105 days
199731 days
1998151 days
199938 days
200070 days
200157 days
200257 days
200387 days
200445 days
200544 days
200660 days
200765 days
200860 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.

Rainfall Return Levels

30 years, 1976 to 2008

A day with at least 104.0 mm (4.1 in) of rain is expected about once in 2 years. A day with at least 179.4 mm (7.1 in) of rain is expected about once in 100 years.

Rainfall return levels at Reforma II: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years104.0 mm (4.1 in)
5 years126.3 mm (5.0 in)
10 years140.2 mm (5.5 in)
25 years156.7 mm (6.2 in)
50 years168.4 mm (6.6 in)Longer than the 30 years of record
100 years179.4 mm (7.1 in)Longer than the 30 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, 30 years of values from 1976 to 2008.

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: 159.8 mm (6.3 in) in 1995; 149.4 mm (5.9 in) in 1999; 146.6 mm (5.8 in) in 1989.

Download the Data

  • Data for Reforma II standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Reforma II 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.

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