Mendota Threshold Days by Year

5 fixed thresholds counted per year at Mendota (USC00445501): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Mendota Thresholds

Mendota: days with 10 mm (0.39 in) or more of precipitation in 66 years, most in 1922 with 56.
Mendota: days with 25 mm (0.98 in) or more of precipitation in 66 years, most in 1957 with 16.
Mendota: days with 50 mm (1.97 in) or more of precipitation in 41 years, most in 1966 with 5.
Mendota: days with 10 cm (3.9 in) or more of snowfall in 16 years, most in 1960 with 5.
5 fixed thresholds have at least one qualifying day at Mendota.

Days with 10 mm (0.39 in) or more of precipitation

66 years with a qualifying day

Days per year at Mendota with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 56 in 1922.

Days with 10 mm (0.39 in) or more of precipitation per year at Mendota
Year	Days	Decade average
1903	35	42.3
1904	40	42.3
1905	42	42.3
1907	49	42.3
1908	41	42.3
1909	47	42.3
1910	38	45
1911	47	45
1912	52	45
1913	52	45
1914	42	45
1915	43	45
1916	41	45
1917	51	45
1918	41	45
1919	43	45
1920	48	46
1921	42	46
1922	56	46
1923	47	46
1924	50	46
1925	33	46
1930	28	38.5
1931	41	38.5
1932	44	38.5
1933	38	38.5
1934	43	38.5
1935	39	38.5
1936	45	38.5
1937	44	38.5
1938	38	38.5
1939	25	38.5
1940	29	37.8
1941	30	37.8
1942	41	37.8
1944	48	37.8
1945	39	37.8
1946	37	37.8
1947	36	37.8
1949	42	37.8
1950	55	45.7
1951	52	45.7
1952	54	45.7
1953	46	45.7
1954	36	45.7
1955	33	45.7
1956	51	45.7
1957	46	45.7
1958	39	45.7
1959	45	45.7
1960	38	37.4
1961	37	37.4
1962	39	37.4
1963	34	37.4
1964	36	37.4
1965	35	37.4
1966	41	37.4
1967	46	37.4
1968	32	37.4
1969	36	37.4
1970	34	41.7
1971	47	41.7
1972	46	41.7
1973	39	41.7
1974	43	41.7
1975	41	41.7

For each year, a bar from the first to the last day at Mendota meeting 10 mm (0.39 in).

First to last qualifying date each year at Mendota
Year	First date	Last date
1903	1903-01-03	1903-12-25
1904	1904-02-08	1904-12-28
1905	1905-01-03	1905-12-23
1907	1907-01-17	1907-12-30
1908	1908-01-05	1908-12-23
1909	1909-01-05	1909-12-25
1910	1910-01-07	1910-12-30
1911	1911-01-01	1911-12-31
1912	1912-01-09	1912-12-30
1913	1913-01-03	1913-12-26
1914	1914-01-03	1914-12-29
1915	1915-01-06	1915-12-29
1916	1916-01-02	1916-12-28
1917	1917-01-03	1917-12-26
1918	1918-01-12	1918-12-22
1919	1919-01-01	1919-12-14
1920	1920-01-17	1920-12-27
1921	1921-01-10	1921-12-25
1922	1922-01-05	1922-12-28
1923	1923-01-01	1923-12-28
1924	1924-01-01	1924-12-31
1925	1925-01-01	1925-12-03
1930	1930-01-02	1930-12-06
1931	1931-01-05	1931-12-22
1932	1932-01-01	1932-12-31
1933	1933-01-09	1933-12-26
1934	1934-01-01	1934-11-30
1935	1935-01-01	1935-11-28
1936	1936-01-02	1936-12-31
1937	1937-01-02	1937-12-28
1938	1938-01-22	1938-12-27
1939	1939-01-05	1939-12-24
1940	1940-01-24	1940-11-06
1941	1941-01-16	1941-12-24
1942	1942-01-01	1942-12-30
1944	1944-01-03	1944-12-28
1945	1945-01-01	1945-12-31
1946	1946-01-07	1946-12-30
1947	1947-01-01	1947-12-16
1949	1949-01-05	1949-12-27
1950	1950-01-11	1950-12-08
1951	1951-01-14	1951-12-21
1952	1952-01-05	1952-12-31
1953	1953-01-11	1953-12-15
1954	1954-01-11	1954-12-30
1955	1955-01-11	1955-12-04
1956	1956-01-24	1956-12-24
1957	1957-01-05	1957-12-26
1958	1958-01-14	1958-12-29
1959	1959-01-09	1959-12-29
1960	1960-01-03	1960-12-30
1961	1961-01-01	1961-12-28
1962	1962-01-16	1962-12-30
1963	1963-01-11	1963-12-23
1964	1964-01-01	1964-12-20
1965	1965-01-10	1965-11-27
1966	1966-01-06	1966-12-29
1967	1967-01-08	1967-12-29
1968	1968-01-01	1968-12-28
1969	1969-01-20	1969-12-31
1970	1970-01-18	1970-12-23
1971	1971-01-05	1971-12-13
1972	1972-01-02	1972-12-22
1973	1973-01-27	1973-12-30
1974	1974-01-01	1974-12-28
1975	1975-01-11	1975-12-26

Every Fixed Threshold

Fixed thresholds at Mendota
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
10 mm (0.39 in): Days with 10 mm or more rain	66	56	1922	41
25 mm (0.98 in): Days with 25 mm or more rain	66	16	1957	13
50 mm (1.97 in): Days with 50 mm or more rain	41	5	1966	1
10 cm (3.9 in): Days with 10 cm or more snowfall	16	5	1960	1
25 cm (9.8 in): Days with 25 cm or more snowfall	2	1	1955	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1903.

Download the Data

Data for Mendota 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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

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

Mendota Threshold Days by Year

Key Facts for Mendota Thresholds

Days with 10 mm (0.39 in) or more of precipitation

Every Fixed Threshold

Download the Data

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