Chapulco Threshold Days by Year (MXN00021023)

9 fixed thresholds counted per year at Chapulco (MXN00021023): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Chapulco Thresholds

Chapulco: days with a maximum temperature at or above 30 C (86 F) in 41 years, most in 1947 with 307.
Chapulco: days with 10 mm (0.39 in) or more of precipitation in 38 years, most in 1958 with 28.
Chapulco: nights with a minimum temperature at or below 0 C (32 F) in 36 years, most in 2003 with 19.
Chapulco: days with a maximum temperature at or above 90 F (32.2 C) in 34 years, most in 1947 with 183.
9 fixed thresholds have at least one qualifying day at Chapulco.

Days at or above 30 C (86 F)

41 years with a qualifying day

Days per year at Chapulco with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 307 in 1947.

Days at or above 30 C (86 F) per year at Chapulco
Year	Days	Decade average
1947	307	116.3
1948	19	116.3
1949	23	116.3
1950	46	66.8
1953	60	66.8
1954	50	66.8
1955	76	66.8
1956	58	66.8
1957	84	66.8
1958	83	66.8
1959	77	66.8
1960	100	49.6
1962	72	49.6
1963	70	49.6
1964	53	49.6
1965	46	49.6
1966	20	49.6
1967	33	49.6
1968	12	49.6
1969	40	49.6
1970	47	32.3
1971	34	32.3
1972	44	32.3
1973	57	32.3
1974	3	32.3
1975	9	32.3
1992	30	78.6
1993	70	78.6
1994	115	78.6
1995	111	78.6
1996	77	78.6
1997	47	78.6
1998	103	78.6
1999	76	78.6
2000	56	33.9
2001	62	33.9
2003	31	33.9
2004	11	33.9
2005	7	33.9
2006	5	33.9
2009	65	33.9

For each year, a bar from the first to the last day at Chapulco meeting 30 C (86 F).

First to last qualifying date each year at Chapulco
Year	First date	Last date
1947	1947-01-01	1947-11-28
1948	1948-02-08	1948-12-05
1949	1949-03-10	1949-06-12
1950	1950-03-11	1950-07-11
1953	1953-02-19	1953-11-24
1954	1954-02-11	1954-12-04
1955	1955-02-19	1955-12-08
1956	1956-02-14	1956-11-02
1957	1957-02-20	1957-12-20
1958	1958-02-27	1958-10-09
1959	1959-02-14	1959-11-04
1960	1960-01-12	1960-11-18
1962	1962-02-08	1962-10-20
1963	1963-02-25	1963-11-05
1964	1964-01-22	1964-08-10
1965	1965-03-11	1965-09-30
1966	1966-03-02	1966-06-09
1967	1967-02-15	1967-06-11
1968	1968-03-19	1968-11-08
1969	1969-04-05	1969-06-13
1970	1970-03-17	1970-05-12
1971	1971-03-28	1971-05-30
1972	1972-03-20	1972-05-29
1973	1973-02-22	1973-06-01
1974	1974-04-14	1974-04-30
1975	1975-04-04	1975-05-08
1992	1992-01-04	1992-07-01
1993	1993-01-07	1993-11-07
1994	1994-02-05	1994-12-29
1995	1995-01-03	1995-12-16
1996	1996-03-01	1996-12-05
1997	1997-01-05	1997-12-10
1998	1998-02-17	1998-07-14
1999	1999-01-28	1999-06-28
2000	2000-02-12	2000-11-15
2001	2001-01-29	2001-06-30
2003	2003-03-01	2003-05-10
2004	2004-04-23	2004-10-21
2005	2005-04-05	2005-06-10
2006	2006-03-11	2006-09-17
2009	2009-02-12	2009-12-26

Every Fixed Threshold

Fixed thresholds at Chapulco
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	41	307	1947	65
35 C (95 F): Days	16	104	1947	15
40 C (104 F): Days	1	3	1947	3
90 F (32.2 C): Days	34	183	1947	3
100 F (37.8 C): Days	2	24	1947	1
0 C (32 F): Frost days (min	36	19	2003	3
10 mm (0.39 in): Days with 10 mm or more rain	38	28	1958	16
25 mm (0.98 in): Days with 25 mm or more rain	33	10	1970	5
50 mm (1.97 in): Days with 50 mm or more rain	9	2	1956	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1947.

Download the Data

Data for Chapulco 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 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Chapulco Threshold Days by Year (MXN00021023)

Key Facts for Chapulco Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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