Calvillo (Smn) Threshold Days by Year (MXN00001003)

10 fixed thresholds counted per year at Calvillo (Smn) (MXN00001003): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Calvillo (Smn) Thresholds

Calvillo (Smn): days with a maximum temperature at or above 30 C (86 F) in 48 years, most in 1981 with 277.
Calvillo (Smn): days with a maximum temperature at or above 35 C (95 F) in 48 years, most in 1981 with 89.
Calvillo (Smn): days with a maximum temperature at or above 90 F (32.2 C) in 48 years, most in 1981 with 171.
Calvillo (Smn): days with 10 mm (0.39 in) or more of precipitation in 48 years, most in 1935 with 36.
10 fixed thresholds have at least one qualifying day at Calvillo (Smn).

Days at or above 30 C (86 F)

48 years with a qualifying day

Days per year at Calvillo (Smn) with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 277 in 1981.

Days at or above 30 C (86 F) per year at Calvillo (Smn)
Year	Days	Decade average
1933	158	155.6
1934	138	155.6
1935	112	155.6
1936	178	155.6
1937	168	155.6
1938	181	155.6
1939	154	155.6
1940	188	171.2
1941	147	171.2
1942	157	171.2
1943	174	171.2
1944	147	171.2
1945	195	171.2
1946	173	171.2
1947	165	171.2
1948	159	171.2
1949	207	171.2
1954	208	180.7
1955	174	180.7
1956	192	180.7
1957	212	180.7
1958	145	180.7
1959	153	180.7
1960	185	148.3
1961	145	148.3
1962	186	148.3
1963	155	148.3
1964	148	148.3
1966	137	148.3
1967	118	148.3
1968	106	148.3
1969	155	148.3
1970	175	188.7
1972	219	188.7
1973	189	188.7
1975	194	188.7
1976	156	188.7
1977	180	188.7
1978	208	188.7
1980	229	219.6
1981	277	219.6
1982	243	219.6
1983	182	219.6
1984	183	219.6
1985	154	219.6
1986	216	219.6
1987	239	219.6
1988	253	219.6

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

First to last qualifying date each year at Calvillo (Smn)
Year	First date	Last date
1933	1933-01-26	1933-12-05
1934	1934-02-22	1934-12-31
1935	1935-01-10	1935-11-19
1936	1936-01-09	1936-11-08
1937	1937-01-11	1937-11-14
1938	1938-02-05	1938-11-23
1939	1939-01-22	1939-10-28
1940	1940-02-20	1940-11-13
1941	1941-02-13	1941-11-23
1942	1942-02-06	1942-12-24
1943	1943-02-07	1943-11-05
1944	1944-02-20	1944-11-15
1945	1945-02-02	1945-11-17
1946	1946-01-30	1946-11-14
1947	1947-03-01	1947-11-09
1948	1948-02-06	1948-12-26
1949	1949-01-06	1949-12-01
1954	1954-02-11	1954-12-09
1955	1955-02-16	1955-11-25
1956	1956-02-19	1956-12-08
1957	1957-01-05	1957-12-20
1958	1958-01-31	1958-10-10
1959	1959-02-08	1959-11-16
1960	1960-01-26	1960-11-28
1961	1961-02-28	1961-11-16
1962	1962-02-09	1962-11-26
1963	1963-01-30	1963-11-01
1964	1964-02-13	1964-09-13
1966	1966-03-04	1966-11-12
1967	1967-02-17	1967-08-13
1968	1968-04-16	1968-10-23
1969	1969-01-30	1969-11-13
1970	1970-03-12	1970-10-29
1972	1972-02-23	1972-12-25
1973	1973-01-07	1973-11-09
1975	1975-01-26	1975-12-05
1976	1976-02-09	1976-10-31
1977	1977-02-19	1977-12-31
1978	1978-01-04	1978-11-28
1980	1980-01-12	1980-12-30
1981	1981-01-04	1981-12-27
1982	1982-01-03	1982-11-21
1983	1983-03-09	1983-12-26
1984	1984-02-16	1984-12-25
1985	1985-01-26	1985-11-25
1986	1986-01-24	1986-12-18
1987	1987-01-05	1987-12-22
1988	1988-01-04	1988-12-26

Every Fixed Threshold

Fixed thresholds at Calvillo (Smn)
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	48	277	1981	253
35 C (95 F): Days	48	89	1981	66
40 C (104 F): Days	5	10	1982	2
90 F (32.2 C): Days	48	171	1981	138
100 F (37.8 C): Days	32	35	1981	20
0 C (32 F): Frost days (min	31	12	1967	7
20 C (68 F): Tropical nights (min	24	4	1957	1
10 mm (0.39 in): Days with 10 mm or more rain	48	36	1935	19
25 mm (0.98 in): Days with 25 mm or more rain	48	11	1986	4
50 mm (1.97 in): Days with 50 mm or more rain	19	2	1986	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1933.

Download the Data

Data for Calvillo (Smn) 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).

Calvillo (Smn) Threshold Days by Year (MXN00001003)

Key Facts for Calvillo (Smn) Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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