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Built 2026-10-18 (18 October 2026)

Reforma I Threshold Days by Year

12 fixed thresholds counted per year at Reforma I (MXN00007138): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Reforma I Thresholds

  • Reforma I: days with a maximum temperature at or above 30 C (86 F) in 28 years, most in 1990 with 358.
  • Reforma I: days with a maximum temperature at or above 35 C (95 F) in 28 years, most in 1991 with 269.
  • Reforma I: days with a maximum temperature at or above 90 F (32.2 C) in 28 years, most in 1990 with 344.
  • Reforma I: days with a maximum temperature at or above 100 F (37.8 C) in 28 years, most in 1995 with 85.
  • 12 fixed thresholds have at least one qualifying day at Reforma I.
28 years with a qualifying day
Days at or above 30 C (86 F) per year at Reforma I Days per year at Reforma I with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 358 in 1990. 01002003004001966: 2221967: 2341968: 2451969: 2591970: 2401971: 2981972: 3081973: 2691974: 2641976: 2501977: 2531978: 2611979: 2711980: 2591981: 2701982: 2941983: 3281985: 3351986: 3421987: 3491989: 3541990: 3581991: 3531992: 3361993: 3551994: 3251995: 3221996: 3101966196919721976197919821986199019931996
Days per year at Reforma I with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 358 in 1990.
Days at or above 30 C (86 F) per year at Reforma I
YearDaysDecade average
1966222240
1967234240
1968245240
1969259240
1970240268.2
1971298268.2
1972308268.2
1973269268.2
1974264268.2
1976250268.2
1977253268.2
1978261268.2
1979271268.2
1980259316.4
1981270316.4
1982294316.4
1983328316.4
1985335316.4
1986342316.4
1987349316.4
1989354316.4
1990358337
1991353337
1992336337
1993355337
1994325337
1995322337
1996310337
First to last qualifying date each year at Reforma I For each year, a bar from the first to the last day at Reforma I meeting 30 C (86 F). 1966: 9 February 1966 to 9 December 19661967: 2 January 1967 to 22 December 19671968: 6 January 1968 to 31 December 19681969: 9 January 1969 to 29 December 19691970: 22 January 1970 to 28 December 19701971: 3 January 1971 to 31 December 19711972: 1 January 1972 to 31 December 19721973: 1 January 1973 to 31 December 19731974: 10 January 1974 to 31 December 19741976: 2 January 1976 to 31 December 19761977: 6 January 1977 to 19 December 19771978: 12 January 1978 to 31 December 19781979: 1 January 1979 to 31 December 19791980: 1 January 1980 to 9 December 19801981: 28 January 1981 to 31 December 19811982: 1 January 1982 to 31 December 19821983: 1 January 1983 to 28 December 19831985: 1 January 1985 to 31 December 19851986: 1 January 1986 to 31 December 19861987: 3 January 1987 to 31 December 19871989: 1 January 1989 to 31 December 19891990: 1 January 1990 to 31 December 19901991: 1 January 1991 to 31 December 19911992: 1 January 1992 to 31 December 19921993: 1 January 1993 to 31 December 19931994: 1 January 1994 to 31 December 19941995: 1 January 1995 to 31 December 19951996: 1 January 1996 to 31 December 19961966197019741979198319891993JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Reforma I meeting 30 C (86 F).
First to last qualifying date each year at Reforma I
YearFirst dateLast date
19661966-02-091966-12-09
19671967-01-021967-12-22
19681968-01-061968-12-31
19691969-01-091969-12-29
19701970-01-221970-12-28
19711971-01-031971-12-31
19721972-01-011972-12-31
19731973-01-011973-12-31
19741974-01-101974-12-31
19761976-01-021976-12-31
19771977-01-061977-12-19
19781978-01-121978-12-31
19791979-01-011979-12-31
19801980-01-011980-12-09
19811981-01-281981-12-31
19821982-01-011982-12-31
19831983-01-011983-12-28
19851985-01-011985-12-31
19861986-01-011986-12-31
19871987-01-031987-12-31
19891989-01-011989-12-31
19901990-01-011990-12-31
19911991-01-011991-12-31
19921992-01-011992-12-31
19931993-01-011993-12-31
19941994-01-011994-12-31
19951995-01-011995-12-31
19961996-01-011996-12-31

Every Fixed Threshold

Fixed thresholds at Reforma I
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days283581990310
35 C (95 F): Days28269199160
40 C (104 F): Days1934199534
90 F (32.2 C): Days283441990183
100 F (37.8 C): Days2885199511
20 C (68 F): Tropical nights (min27299197251
25 C (77 F): Days with min161119701
10 mm (0.39 in): Days with 10 mm or more rain2885196950
25 mm (0.98 in): Days with 25 mm or more rain2844197921
50 mm (1.97 in): Days with 50 mm or more rain2815197012
100 mm (3.94 in): Days with 100 mm or more rain19419671
200 mm (7.87 in): Days with 200 mm or more rain2119671

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1966.

Download the Data

  • 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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

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