Cooper Threshold Days by Year (USC00411970)

6 fixed thresholds counted per year at Cooper (USC00411970): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Cooper Thresholds

Cooper: days with 10 mm (0.39 in) or more of precipitation in 66 years, most in 1968 with 53.
Cooper: days with 25 mm (0.98 in) or more of precipitation in 66 years, most in 1946 with 27.
Cooper: days with 50 mm (1.97 in) or more of precipitation in 63 years, most in 1987 with 9.
Cooper: days with 100 mm (3.94 in) or more of precipitation in 23 years, most in 2015 with 3.
6 fixed thresholds have at least one qualifying day at Cooper.

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

66 years with a qualifying day

Days per year at Cooper with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 53 in 1968.

Days with 10 mm (0.39 in) or more of precipitation per year at Cooper
Year	Days	Decade average
1946	45	39
1949	33	39
1950	33	30.4
1951	29	30.4
1952	29	30.4
1953	32	30.4
1954	28	30.4
1955	26	30.4
1956	20	30.4
1958	38	30.4
1959	39	30.4
1960	46	38.1
1961	34	38.1
1962	43	38.1
1963	23	38.1
1964	34	38.1
1965	30	38.1
1966	38	38.1
1967	39	38.1
1968	53	38.1
1969	41	38.1
1970	32	34.5
1971	29	34.5
1972	41	34.5
1973	48	34.5
1974	47	34.5
1975	27	34.5
1976	34	34.5
1977	23	34.5
1978	24	34.5
1979	40	34.5
1980	25	31.7
1981	36	31.7
1982	31	31.7
1983	30	31.7
1984	33	31.7
1985	29	31.7
1986	34	31.7
1987	39	31.7
1988	29	31.7
1989	31	31.7
1993	31	35.5
1994	39	35.5
1996	39	35.5
1997	33	35.5
2000	40	28.6
2003	24	28.6
2005	15	28.6
2006	21	28.6
2009	43	28.6
2011	25	33.6
2012	28	33.6
2013	31	33.6
2014	25	33.6
2015	45	33.6
2016	30	33.6
2017	30	33.6
2018	40	33.6
2019	48	33.6
2020	42	32.1
2021	36	32.1
2022	28	32.1
2023	34	32.1
2024	39	32.1
2025	33	32.1
2026	13	32.1

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

First to last qualifying date each year at Cooper
Year	First date	Last date
1946	1946-01-04	1946-12-28
1949	1949-01-17	1949-12-17
1950	1950-01-12	1950-12-21
1951	1951-01-13	1951-12-08
1952	1952-01-03	1952-12-31
1953	1953-01-17	1953-12-12
1954	1954-01-10	1954-12-29
1955	1955-01-10	1955-12-01
1956	1956-01-22	1956-12-20
1958	1958-01-13	1958-12-31
1959	1959-01-15	1959-12-16
1960	1960-01-01	1960-12-31
1961	1961-01-07	1961-12-17
1962	1962-01-09	1962-11-27
1963	1963-01-05	1963-12-23
1964	1964-01-17	1964-12-10
1965	1965-01-03	1965-12-24
1966	1966-01-20	1966-12-28
1967	1967-01-26	1967-12-31
1968	1968-01-04	1968-12-22
1969	1969-01-16	1969-12-29
1970	1970-01-06	1970-12-30
1971	1971-02-05	1971-12-15
1972	1972-01-01	1972-12-15
1973	1973-01-03	1973-12-24
1974	1974-01-10	1974-12-30
1975	1975-01-31	1975-12-25
1976	1976-02-05	1976-12-11
1977	1977-02-03	1977-12-29
1978	1978-01-12	1978-12-31
1979	1979-01-19	1979-12-23
1980	1980-01-20	1980-12-09
1981	1981-02-10	1981-12-01
1982	1982-01-31	1982-12-27
1983	1983-02-01	1983-12-17
1984	1984-01-10	1984-12-16
1985	1985-02-05	1985-12-11
1986	1986-02-04	1986-12-18
1987	1987-01-08	1987-12-27
1988	1988-01-07	1988-12-23
1989	1989-01-13	1989-11-13
1993	1993-01-04	1993-12-13
1994	1994-01-11	1994-12-16
1996	1996-01-03	1996-12-15
1997	1997-01-08	1997-12-21
2000	2000-01-08	2000-12-27
2003	2003-02-06	2003-12-13
2005	2005-01-03	2005-09-29
2006	2006-01-22	2006-12-30
2009	2009-02-11	2009-12-24
2011	2011-01-10	2011-12-20
2012	2012-01-09	2012-12-26
2013	2013-01-09	2013-12-21
2014	2014-01-11	2014-12-24
2015	2015-01-02	2015-12-28
2016	2016-01-07	2016-12-24
2017	2017-01-02	2017-12-24
2018	2018-01-22	2018-12-31
2019	2019-01-03	2019-12-29
2020	2020-01-11	2020-12-31
2021	2021-01-01	2021-12-30
2022	2022-02-03	2022-12-14
2023	2023-01-03	2023-12-25
2024	2024-01-09	2024-12-29
2025	2025-01-11	2025-11-29
2026	2026-01-25	2026-10-04

Every Fixed Threshold

Fixed thresholds at Cooper
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	53	1968	13
25 mm (0.98 in): Days with 25 mm or more rain	66	27	1946	7
50 mm (1.97 in): Days with 50 mm or more rain	63	9	1987	2
100 mm (3.94 in): Days with 100 mm or more rain	23	3	2015	1
200 mm (7.87 in): Days with 200 mm or more rain	1	1	1982	1
10 cm (3.9 in): Days with 10 cm or more snowfall	4	4	1978	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1946.

Download the Data

Data for Cooper 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Cooper Threshold Days by Year (USC00411970)

Key Facts for Cooper Thresholds

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

Every Fixed Threshold

Download the Data

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