Tlahuac Threshold Days by Year (MXN00009051)

8 fixed thresholds counted per year at Tlahuac (MXN00009051): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Tlahuac Thresholds

Tlahuac: days with 10 mm (0.39 in) or more of precipitation in 36 years, most in 2006 with 28.
Tlahuac: days with 25 mm (0.98 in) or more of precipitation in 34 years, most in 1961 with 6.
Tlahuac: days with a maximum temperature at or above 30 C (86 F) in 29 years, most in 1978 with 162.
Tlahuac: nights with a minimum temperature at or below 0 C (32 F) in 25 years, most in 1970 with 59.
8 fixed thresholds have at least one qualifying day at Tlahuac.

Days at or above 30 C (86 F)

29 years with a qualifying day

Days per year at Tlahuac with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 162 in 1978.

Days at or above 30 C (86 F) per year at Tlahuac
Year	Days	Decade average
1966	13	17.7
1967	15	17.7
1969	25	17.7
1970	26	32.5
1971	24	32.5
1972	19	32.5
1973	28	32.5
1974	9	32.5
1975	20	32.5
1976	1	32.5
1977	26	32.5
1978	162	32.5
1979	10	32.5
1980	33	35.1
1981	122	35.1
1982	29	35.1
1983	51	35.1
1984	22	35.1
1985	8	35.1
1986	20	35.1
1987	4	35.1
1988	27	35.1
1998	42	25.5
1999	9	25.5
2002	42	71.3
2005	79	71.3
2006	118	71.3
2007	46	71.3
2011	64	64

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

First to last qualifying date each year at Tlahuac
Year	First date	Last date
1966	1966-05-12	1966-06-09
1967	1967-04-22	1967-06-20
1969	1969-03-11	1969-10-16
1970	1970-03-29	1970-06-01
1971	1971-04-20	1971-05-30
1972	1972-04-06	1972-05-23
1973	1973-03-13	1973-06-05
1974	1974-05-08	1974-10-06
1975	1975-03-16	1975-05-09
1976	1976-05-24	1976-05-24
1977	1977-03-14	1977-12-24
1978	1978-01-25	1978-12-31
1979	1979-01-01	1979-06-05
1980	1980-03-08	1980-12-08
1981	1981-01-08	1981-06-15
1982	1982-03-17	1982-06-16
1983	1983-03-18	1983-06-21
1984	1984-03-26	1984-05-07
1985	1985-03-29	1985-05-31
1986	1986-03-18	1986-05-17
1987	1987-03-24	1987-04-18
1988	1988-04-17	1988-08-03
1998	1998-04-19	1998-05-31
1999	1999-04-08	1999-04-30
2002	2002-01-16	2002-11-30
2005	2005-05-01	2005-12-28
2006	2006-02-16	2006-11-05
2007	2007-02-13	2007-08-02
2011	2011-03-05	2011-09-28

Every Fixed Threshold

Fixed thresholds at Tlahuac
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	29	162	1978	64
35 C (95 F): Days	8	23	1981	4
90 F (32.2 C): Days	13	69	1981	5
100 F (37.8 C): Days	3	6	1981	2
0 C (32 F): Frost days (min	25	59	1970	16
10 mm (0.39 in): Days with 10 mm or more rain	36	28	2006	17
25 mm (0.98 in): Days with 25 mm or more rain	34	6	1961	4
50 mm (1.97 in): Days with 50 mm or more rain	7	2	2007	1

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 Tlahuac 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).

Tlahuac Threshold Days by Year (MXN00009051)

Key Facts for Tlahuac Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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