San Isidro Threshold Days by Year (MXN00004030)

14 fixed thresholds counted per year at San Isidro (MXN00004030): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for San Isidro Thresholds

San Isidro: days with 10 mm (0.39 in) or more of precipitation in 35 years, most in 1980 with 60.
San Isidro: days with 25 mm (0.98 in) or more of precipitation in 35 years, most in 1983 with 26.
San Isidro: days with 50 mm (1.97 in) or more of precipitation in 35 years, most in 1983 with 10.
San Isidro: days with a maximum temperature at or above 30 C (86 F) in 34 years, most in 1995 with 365.
14 fixed thresholds have at least one qualifying day at San Isidro.

Days at or above 30 C (86 F)

34 years with a qualifying day

Days per year at San Isidro with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 365 in 1995.

Days at or above 30 C (86 F) per year at San Isidro
Year	Days	Decade average
1959	294	294
1960	324	307.5
1961	306	307.5
1962	315	307.5
1963	313	307.5
1964	314	307.5
1965	313	307.5
1966	292	307.5
1967	293	307.5
1968	302	307.5
1969	303	307.5
1970	295	281.3
1971	310	281.3
1972	318	281.3
1973	308	281.3
1974	257	281.3
1975	279	281.3
1976	266	281.3
1977	260	281.3
1978	264	281.3
1979	256	281.3
1980	276	277
1981	256	277
1982	276	277
1983	270	277
1985	307	277
1995	365	364
1996	363	364
2004	335	345.4
2005	358	345.4
2006	350	345.4
2007	361	345.4
2009	323	345.4
2010	354	354

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

First to last qualifying date each year at San Isidro
Year	First date	Last date
1959	1959-01-01	1959-12-28
1960	1960-01-01	1960-12-30
1961	1961-01-01	1961-12-28
1962	1962-01-05	1962-12-31
1963	1963-01-01	1963-12-31
1964	1964-01-07	1964-12-31
1965	1965-01-01	1965-12-25
1966	1966-01-02	1966-12-31
1967	1967-01-01	1967-12-31
1968	1968-01-02	1968-12-31
1969	1969-01-01	1969-12-31
1970	1970-01-01	1970-12-30
1971	1971-01-01	1971-12-28
1972	1972-01-01	1972-12-31
1973	1973-01-01	1973-12-25
1974	1974-01-01	1974-12-29
1975	1975-01-09	1975-12-18
1976	1976-01-02	1976-12-31
1977	1977-01-01	1977-12-31
1978	1978-01-01	1978-12-31
1979	1979-01-01	1979-12-24
1980	1980-01-08	1980-11-28
1981	1981-01-27	1981-11-30
1982	1982-01-01	1982-12-29
1983	1983-01-09	1983-12-28
1985	1985-01-01	1985-11-30
1995	1995-01-01	1995-12-31
1996	1996-01-01	1996-12-31
2004	2004-01-01	2004-12-30
2005	2005-01-01	2005-12-31
2006	2006-01-01	2006-12-31
2007	2007-01-01	2007-12-31
2009	2009-01-01	2009-12-31
2010	2010-01-02	2010-12-29

Every Fixed Threshold

Fixed thresholds at San Isidro
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	34	365	1995	354
35 C (95 F): Days	34	265	2009	240
40 C (104 F): Days	27	78	2009	55
45 C (113 F): Days	1	9	2009	9
90 F (32.2 C): Days	34	300	2005	281
100 F (37.8 C): Days	34	191	2009	106
110 F (43.3 C): Days	6	15	2009	15
20 C (68 F): Tropical nights (min	34	296	2007	227
25 C (77 F): Days with min	19	66	2007	62
10 mm (0.39 in): Days with 10 mm or more rain	35	60	1980	44
25 mm (0.98 in): Days with 25 mm or more rain	35	26	1983	19
50 mm (1.97 in): Days with 50 mm or more rain	35	10	1983	4
100 mm (3.94 in): Days with 100 mm or more rain	11	4	1995	2
200 mm (7.87 in): Days with 200 mm or more rain	1	1	1995	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1959.

Download the Data

Data for San Isidro 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).

San Isidro Threshold Days by Year (MXN00004030)

Key Facts for San Isidro Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

Related