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Built 2026-10-19 (19 October 2026)

Chemax Threshold Days by Year (MXN00031069)

12 fixed thresholds counted per year at Chemax (MXN00031069): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Chemax Thresholds

  • Chemax: days with 10 mm (0.39 in) or more of precipitation in 25 years, most in 1983 with 58.
  • Chemax: days with 25 mm (0.98 in) or more of precipitation in 24 years, most in 1999 with 26.
  • Chemax: days with a maximum temperature at or above 30 C (86 F) in 22 years, most in 1993 with 356.
  • Chemax: days with a maximum temperature at or above 35 C (95 F) in 22 years, most in 1998 with 227.
  • 12 fixed thresholds have at least one qualifying day at Chemax.
22 years with a qualifying day
Days at or above 30 C (86 F) per year at Chemax Days per year at Chemax with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 356 in 1993. 01002003004001979: 2761980: 2871983: 3201984: 3551985: 3291986: 3141987: 3071988: 3331992: 3261993: 3561994: 3441995: 3321996: 3211997: 3521998: 3451999: 3262000: 3182001: 3162002: 2722003: 2772004: 2782005: 24619791984198719931996199920022005
Days per year at Chemax with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 356 in 1993.
Days at or above 30 C (86 F) per year at Chemax
YearDaysDecade average
1979276276
1980287320.7
1983320320.7
1984355320.7
1985329320.7
1986314320.7
1987307320.7
1988333320.7
1992326337.8
1993356337.8
1994344337.8
1995332337.8
1996321337.8
1997352337.8
1998345337.8
1999326337.8
2000318284.5
2001316284.5
2002272284.5
2003277284.5
2004278284.5
2005246284.5
First to last qualifying date each year at Chemax For each year, a bar from the first to the last day at Chemax meeting 30 C (86 F). 1979: 1 February 1979 to 27 December 19791980: 13 January 1980 to 24 December 19801983: 1 January 1983 to 31 December 19831984: 2 January 1984 to 31 December 19841985: 1 January 1985 to 29 December 19851986: 1 January 1986 to 30 December 19861987: 1 January 1987 to 27 December 19871988: 1 January 1988 to 30 December 19881992: 6 January 1992 to 31 December 19921993: 1 January 1993 to 31 December 19931994: 2 January 1994 to 31 December 19941995: 1 January 1995 to 30 December 19951996: 1 January 1996 to 31 December 19961997: 1 January 1997 to 31 December 19971998: 1 January 1998 to 31 December 19981999: 1 January 1999 to 26 December 19992000: 2 January 2000 to 27 December 20002001: 3 January 2001 to 30 December 20012002: 1 January 2002 to 24 December 20022003: 1 January 2003 to 30 December 20032004: 1 January 2004 to 29 December 20042005: 1 January 2005 to 30 December 200519791984198719931996199920022005JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Chemax meeting 30 C (86 F).
First to last qualifying date each year at Chemax
YearFirst dateLast date
19791979-02-011979-12-27
19801980-01-131980-12-24
19831983-01-011983-12-31
19841984-01-021984-12-31
19851985-01-011985-12-29
19861986-01-011986-12-30
19871987-01-011987-12-27
19881988-01-011988-12-30
19921992-01-061992-12-31
19931993-01-011993-12-31
19941994-01-021994-12-31
19951995-01-011995-12-30
19961996-01-011996-12-31
19971997-01-011997-12-31
19981998-01-011998-12-31
19991999-01-011999-12-26
20002000-01-022000-12-27
20012001-01-032001-12-30
20022002-01-012002-12-24
20032003-01-012003-12-30
20042004-01-012004-12-29
20052005-01-012005-12-30

Every Fixed Threshold

Fixed thresholds at Chemax
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days223561993246
35 C (95 F): Days22227199893
40 C (104 F): Days142419831
90 F (32.2 C): Days223181998152
100 F (37.8 C): Days227019987
110 F (43.3 C): Days1119841
20 C (68 F): Tropical nights (min222771998171
25 C (77 F): Days with min153919984
10 mm (0.39 in): Days with 10 mm or more rain2558198342
25 mm (0.98 in): Days with 25 mm or more rain242619999
50 mm (1.97 in): Days with 50 mm or more rain19719955
100 mm (3.94 in): Days with 100 mm or more rain2119831

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1979.

Download the Data

  • Data for Chemax 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). Threshold counts are computed by this site.

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