Dover Threshold Days by Year (USC00092799)

4 fixed thresholds counted per year at Dover (USC00092799): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Dover Thresholds

Dover: days with 10 mm (0.39 in) or more of precipitation in 75 years, most in 1991 with 56.
Dover: days with 25 mm (0.98 in) or more of precipitation in 75 years, most in 1971 with 23.
Dover: days with 50 mm (1.97 in) or more of precipitation in 72 years, most in 2005 with 9.
Dover: days with 100 mm (3.94 in) or more of precipitation in 17 years, most in 1933 with 2.
4 fixed thresholds have at least one qualifying day at Dover.

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

75 years with a qualifying day

Days per year at Dover with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 56 in 1991.

Days with 10 mm (0.39 in) or more of precipitation per year at Dover
Year	Days	Decade average
1932	40	36
1933	36	36
1934	38	36
1935	33	36
1936	40	36
1937	41	36
1938	26	36
1939	34	36
1940	34	36.7
1941	33	36.7
1942	32	36.7
1943	36	36.7
1944	38	36.7
1945	32	36.7
1946	29	36.7
1947	47	36.7
1948	48	36.7
1949	38	36.7
1950	33	37.8
1951	29	37.8
1952	39	37.8
1953	42	37.8
1954	26	37.8
1955	36	37.8
1957	44	37.8
1958	42	37.8
1959	49	37.8
1960	40	39.7
1961	40	39.7
1962	43	39.7
1963	39	39.7
1964	51	39.7
1965	41	39.7
1966	37	39.7
1967	38	39.7
1968	30	39.7
1969	38	39.7
1970	40	40.2
1971	44	40.2
1972	28	40.2
1974	36	40.2
1975	51	40.2
1976	45	40.2
1977	36	40.2
1978	37	40.2
1979	45	40.2
1980	30	36.7
1981	27	36.7
1983	43	36.7
1984	42	36.7
1985	36	36.7
1986	35	36.7
1987	39	36.7
1988	35	36.7
1989	43	36.7
1990	29	41.1
1991	56	41.1
1992	56	41.1
1993	38	41.1
1995	45	41.1
1996	34	41.1
1997	44	41.1
1998	39	41.1
1999	29	41.1
2000	30	32.6
2002	35	32.6
2003	41	32.6
2004	36	32.6
2005	36	32.6
2006	16	32.6
2007	31	32.6
2008	30	32.6
2009	38	32.6
2010	35	31
2011	27	31

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

First to last qualifying date each year at Dover
Year	First date	Last date
1932	1932-01-01	1932-12-16
1933	1933-01-12	1933-11-22
1934	1934-01-20	1934-12-19
1935	1935-01-09	1935-12-30
1936	1936-01-03	1936-12-16
1937	1937-01-01	1937-12-24
1938	1938-01-11	1938-12-30
1939	1939-01-30	1939-12-27
1940	1940-01-08	1940-12-25
1941	1941-01-04	1941-12-26
1942	1942-01-02	1942-12-30
1943	1943-01-08	1943-12-29
1944	1944-01-03	1944-11-30
1945	1945-01-07	1945-12-31
1946	1946-01-16	1946-11-29
1947	1947-01-05	1947-12-22
1948	1948-01-02	1948-12-30
1949	1949-01-06	1949-12-16
1950	1950-03-05	1950-11-25
1951	1951-02-02	1951-12-21
1952	1952-01-23	1952-12-31
1953	1953-01-19	1953-12-26
1954	1954-02-25	1954-12-14
1955	1955-01-11	1955-10-29
1957	1957-01-17	1957-12-09
1958	1958-01-25	1958-12-28
1959	1959-01-01	1959-12-24
1960	1960-01-28	1960-12-21
1961	1961-01-01	1961-12-15
1962	1962-01-28	1962-12-30
1963	1963-01-12	1963-12-14
1964	1964-01-01	1964-12-27
1965	1965-01-24	1965-12-19
1966	1966-01-05	1966-12-31
1967	1967-01-01	1967-12-28
1968	1968-01-02	1968-12-31
1969	1969-01-20	1969-12-26
1970	1970-01-01	1970-12-30
1971	1971-01-05	1971-12-21
1972	1972-01-05	1972-12-22
1974	1974-01-11	1974-12-21
1975	1975-01-04	1975-12-31
1976	1976-01-01	1976-12-26
1977	1977-01-03	1977-12-31
1978	1978-01-09	1978-12-25
1979	1979-01-02	1979-12-25
1980	1980-01-23	1980-12-23
1981	1981-01-28	1981-12-31
1983	1983-01-02	1983-12-29
1984	1984-01-12	1984-12-05
1985	1985-01-03	1985-12-13
1986	1986-01-12	1986-12-23
1987	1987-01-01	1987-10-28
1988	1988-01-02	1988-12-15
1989	1989-01-01	1989-12-20
1990	1990-01-01	1990-12-21
1991	1991-01-02	1991-12-29
1992	1992-01-02	1992-12-10
1993	1993-01-08	1993-12-24
1995	1995-01-07	1995-12-19
1996	1996-01-08	1996-12-18
1997	1997-01-01	1997-12-25
1998	1998-01-08	1998-12-25
1999	1999-01-02	1999-12-19
2000	2000-01-04	2000-12-28
2002	2002-01-02	2002-12-31
2003	2003-01-22	2003-12-14
2004	2004-01-25	2004-12-26
2005	2005-01-14	2005-12-28
2006	2006-01-02	2006-12-03
2007	2007-01-05	2007-12-30
2008	2008-01-17	2008-12-11
2009	2009-02-18	2009-12-25
2010	2010-01-16	2010-12-26
2011	2011-01-05	2011-12-27

Every Fixed Threshold

Fixed thresholds at Dover
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	75	56	1991	27
25 mm (0.98 in): Days with 25 mm or more rain	75	23	1971	10
50 mm (1.97 in): Days with 50 mm or more rain	72	9	2005	2
100 mm (3.94 in): Days with 100 mm or more rain	17	2	1933	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1932.

Download the Data

Data for Dover 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).

Dover Threshold Days by Year (USC00092799)

Key Facts for Dover Thresholds

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

Every Fixed Threshold

Download the Data

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