Chinocup Threshold Days by Year

4 fixed thresholds counted per year at Chinocup (ASN00010551): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Chinocup Thresholds

Chinocup: days with 10 mm (0.39 in) or more of precipitation in 63 years, most in 1939 with 16.
Chinocup: days with 25 mm (0.98 in) or more of precipitation in 46 years, most in 1955 with 5.
Chinocup: days with 50 mm (1.97 in) or more of precipitation in 5 years, most in 1955 with 2.
Chinocup: days with 100 mm (3.94 in) or more of precipitation in 1 years, most in 1955 with 1.
4 fixed thresholds have at least one qualifying day at Chinocup.

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

63 years with a qualifying day

Days per year at Chinocup with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 16 in 1939.

Days with 10 mm (0.39 in) or more of precipitation per year at Chinocup
Year	Days	Decade average
1910	10	10.4
1911	9	10.4
1913	10	10.4
1914	9	10.4
1915	14	10.4
1916	11	10.4
1917	14	10.4
1918	10	10.4
1919	7	10.4
1920	6	8.6
1921	6	8.6
1922	6	8.6
1923	6	8.6
1924	12	8.6
1925	8	8.6
1926	13	8.6
1927	8	8.6
1928	11	8.6
1929	10	8.6
1930	11	9.7
1931	10	9.7
1932	13	9.7
1933	8	9.7
1934	9	9.7
1935	8	9.7
1936	5	9.7
1937	11	9.7
1938	6	9.7
1939	16	9.7
1940	6	8
1941	3	8
1942	8	8
1943	10	8
1944	6	8
1945	11	8
1946	14	8
1947	11	8
1948	3	8
1949	8	8
1950	4	9
1951	11	9
1954	6	9
1955	16	9
1956	3	9
1957	6	9
1958	13	9
1959	13	9
1960	12	11.2
1961	12	11.2
1962	10	11.2
1963	11	11.2
1964	12	11.2
1965	13	11.2
1966	14	11.2
1967	6	11.2
1968	14	11.2
1969	8	11.2
1970	9	10.5
1971	13	10.5
1972	7	10.5
1973	9	10.5
1974	15	10.5
1975	10	10.5

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

First to last qualifying date each year at Chinocup
Year	First date	Last date
1910	1910-04-15	1910-10-31
1911	1911-01-04	1911-12-03
1913	1913-04-10	1913-12-20
1914	1914-02-18	1914-12-04
1915	1915-01-02	1915-10-10
1916	1916-01-29	1916-10-05
1917	1917-03-08	1917-08-09
1918	1918-01-26	1918-11-27
1919	1919-03-30	1919-11-08
1920	1920-03-13	1920-09-08
1921	1921-05-08	1921-10-31
1922	1922-03-02	1922-11-28
1923	1923-04-23	1923-06-27
1924	1924-05-12	1924-10-27
1925	1925-01-24	1925-12-10
1926	1926-02-05	1926-12-15
1927	1927-03-13	1927-12-12
1928	1928-01-24	1928-09-28
1929	1929-01-02	1929-11-06
1930	1930-03-06	1930-09-30
1931	1931-04-13	1931-09-05
1932	1932-01-21	1932-10-23
1933	1933-03-07	1933-12-02
1934	1934-03-09	1934-10-13
1935	1935-04-04	1935-10-19
1936	1936-04-15	1936-06-07
1937	1937-03-03	1937-08-23
1938	1938-03-15	1938-12-04
1939	1939-01-20	1939-11-01
1940	1940-06-26	1940-12-03
1941	1941-08-19	1941-12-13
1942	1942-03-14	1942-12-06
1943	1943-01-31	1943-08-18
1944	1944-01-20	1944-08-29
1945	1945-05-16	1945-08-22
1946	1946-05-14	1946-11-15
1947	1947-02-17	1947-10-18
1948	1948-07-30	1948-11-15
1949	1949-05-10	1949-11-14
1950	1950-05-09	1950-09-13
1951	1951-01-01	1951-12-04
1954	1954-05-23	1954-08-23
1955	1955-02-06	1955-10-27
1956	1956-05-13	1956-07-28
1957	1957-01-25	1957-10-27
1958	1958-05-04	1958-11-21
1959	1959-06-01	1959-12-31
1960	1960-01-01	1960-12-17
1961	1961-01-26	1961-12-16
1962	1962-03-20	1962-12-21
1963	1963-03-02	1963-10-31
1964	1964-02-20	1964-10-21
1965	1965-05-04	1965-10-21
1966	1966-01-02	1966-10-09
1967	1967-05-09	1967-07-27
1968	1968-01-27	1968-09-10
1969	1969-03-20	1969-11-04
1970	1970-02-17	1970-09-07
1971	1971-01-02	1971-11-23
1972	1972-05-30	1972-08-17
1973	1973-01-08	1973-11-14
1974	1974-03-04	1974-11-19
1975	1975-03-09	1975-11-17

Every Fixed Threshold

Fixed thresholds at Chinocup
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	63	16	1939	10
25 mm (0.98 in): Days with 25 mm or more rain	46	5	1955	3
50 mm (1.97 in): Days with 50 mm or more rain	5	2	1955	2
100 mm (3.94 in): Days with 100 mm or more rain	1	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 1910.

Download the Data

Data for Chinocup 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 2026-10-15 (15 October 2026). Threshold counts are computed by this site.

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

Chinocup Threshold Days by Year

Key Facts for Chinocup Thresholds

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

Every Fixed Threshold

Download the Data

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