Dover Threshold Days by Year (USC00072730)

19 fixed thresholds counted per year at Dover (USC00072730): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Dover Thresholds

Dover: nights with a minimum temperature at or below 0 C (32 F) in 117 years, most in 1926 with 117.
Dover: nights with a minimum temperature at or above 20 C (68 F) in 117 years, most in 2018 with 81.
Dover: days with a maximum temperature at or above 30 C (86 F) in 116 years, most in 2010 with 95.
Dover: days with a maximum temperature at or above 90 F (32.2 C) in 116 years, most in 1987 with 56.
19 fixed thresholds have at least one qualifying day at Dover.

Days at or above 30 C (86 F)

116 years with a qualifying day

Days per year at Dover with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 95 in 2010.

Days at or above 30 C (86 F) per year at Dover
Year	Days	Decade average
1893	28	39.3
1895	40	39.3
1896	38	39.3
1898	51	39.3
1907	39	53
1908	72	53
1909	48	53
1910	69	62.7
1911	65	62.7
1912	55	62.7
1913	58	62.7
1914	74	62.7
1915	55	62.7
1920	45	48.5
1921	75	48.5
1922	37	48.5
1923	37	48.5
1924	37	48.5
1925	65	48.5
1926	53	48.5
1927	35	48.5
1928	49	48.5
1929	52	48.5
1930	84	63.3
1931	67	63.3
1932	68	63.3
1933	65	63.3
1934	61	63.3
1935	44	63.3
1936	61	63.3
1937	50	63.3
1938	56	63.3
1939	77	63.3
1940	47	55.6
1941	81	55.6
1942	64	55.6
1943	60	55.6
1944	69	55.6
1945	50	55.6
1946	29	55.6
1947	48	55.6
1948	45	55.6
1949	63	55.6
1950	44	66.1
1951	65	66.1
1952	68	66.1
1953	64	66.1
1954	69	66.1
1955	61	66.1
1956	58	66.1
1957	92	66.1
1958	57	66.1
1959	83	66.1
1960	56	62
1961	62	62
1962	64	62
1963	53	62
1964	67	62
1965	76	62
1966	77	62
1967	44	62
1968	62	62
1969	59	62
1970	66	56.9
1971	51	56.9
1972	47	56.9
1973	59	56.9
1974	57	56.9
1975	54	56.9
1976	67	56.9
1977	77	56.9
1978	50	56.9
1979	41	56.9
1980	79	67.9
1981	52	67.9
1982	57	67.9
1983	78	67.9
1984	65	67.9
1985	72	67.9
1986	77	67.9
1987	75	67.9
1988	72	67.9
1989	52	67.9
1991	78	50.2
1992	27	50.2
1993	54	50.2
1994	52	50.2
1995	53	50.2
1996	26	50.2
1997	45	50.2
1998	56	50.2
1999	61	50.2
2000	30	52.3
2001	43	52.3
2002	71	52.3
2003	44	52.3
2004	40	52.3
2005	55	52.3
2006	58	52.3
2007	64	52.3
2008	66	52.3
2010	95	65.6
2011	74	65.6
2012	64	65.6
2013	54	65.6
2014	38	65.6
2015	63	65.6
2016	71	65.6
2017	54	65.6
2018	61	65.6
2019	82	65.6
2022	71	65
2023	53	65
2024	66	65
2025	56	65
2026	79	65

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

First to last qualifying date each year at Dover
Year	First date	Last date
1893	1893-05-21	1893-09-07
1895	1895-05-09	1895-09-26
1896	1896-04-16	1896-09-19
1898	1898-05-20	1898-09-18
1907	1907-06-17	1907-09-21
1908	1908-04-26	1908-10-18
1909	1909-04-19	1909-09-05
1910	1910-03-30	1910-10-16
1911	1911-05-10	1911-09-25
1912	1912-05-20	1912-10-12
1913	1913-05-02	1913-09-08
1914	1914-05-19	1914-10-10
1915	1915-04-20	1915-09-17
1920	1920-06-02	1920-09-27
1921	1921-03-21	1921-09-30
1922	1922-06-07	1922-10-05
1923	1923-05-29	1923-08-22
1924	1924-05-05	1924-09-02
1925	1925-05-23	1925-09-28
1926	1926-04-22	1926-10-05
1927	1927-04-20	1927-10-02
1928	1928-05-05	1928-09-13
1929	1929-04-06	1929-09-11
1930	1930-05-02	1930-09-26
1931	1931-05-29	1931-10-06
1932	1932-05-26	1932-09-23
1933	1933-05-14	1933-09-27
1934	1934-05-05	1934-09-27
1935	1935-05-28	1935-08-22
1936	1936-05-08	1936-09-13
1937	1937-05-22	1937-09-04
1938	1938-04-20	1938-09-15
1939	1939-04-25	1939-10-10
1940	1940-05-14	1940-09-22
1941	1941-04-14	1941-10-08
1942	1942-04-07	1942-09-18
1943	1943-05-07	1943-09-17
1944	1944-05-13	1944-09-21
1945	1945-03-17	1945-09-30
1946	1946-06-08	1946-09-17
1947	1947-05-13	1947-09-15
1948	1948-03-21	1948-09-18
1949	1949-05-06	1949-10-11
1950	1950-05-06	1950-09-02
1951	1951-05-16	1951-10-06
1952	1952-04-20	1952-10-02
1953	1953-05-10	1953-09-29
1954	1954-05-29	1954-10-14
1955	1955-05-05	1955-09-20
1956	1956-05-13	1956-09-23
1957	1957-04-21	1957-09-23
1958	1958-06-01	1958-10-10
1959	1959-04-09	1959-10-07
1960	1960-04-15	1960-09-09
1961	1961-04-25	1961-09-24
1962	1962-04-26	1962-10-12
1963	1963-04-03	1963-09-20
1964	1964-05-08	1964-09-24
1965	1965-05-03	1965-09-24
1966	1966-05-06	1966-09-12
1967	1967-06-09	1967-10-06
1968	1968-05-03	1968-10-03
1969	1969-04-27	1969-09-17
1970	1970-05-09	1970-09-27
1971	1971-06-04	1971-09-09
1972	1972-06-04	1972-09-26
1973	1973-06-04	1973-09-29
1974	1974-04-29	1974-09-22
1975	1975-05-21	1975-08-31
1976	1976-04-16	1976-09-14
1977	1977-04-12	1977-09-20
1978	1978-05-20	1978-08-31
1979	1979-05-09	1979-09-07
1980	1980-05-06	1980-09-24
1981	1981-05-25	1981-09-15
1982	1982-05-20	1982-09-18
1983	1983-05-15	1983-09-21
1984	1984-05-20	1984-09-25
1985	1985-04-19	1985-10-15
1986	1986-05-01	1986-10-05
1987	1987-05-10	1987-09-28
1988	1988-05-23	1988-09-23
1989	1989-05-26	1989-10-16
1991	1991-04-09	1991-09-19
1992	1992-05-22	1992-08-27
1993	1993-05-28	1993-09-16
1994	1994-04-27	1994-09-17
1995	1995-06-08	1995-09-15
1996	1996-05-19	1996-09-11
1997	1997-06-19	1997-10-07
1998	1998-05-16	1998-09-28
1999	1999-05-29	1999-09-09
2000	2000-05-06	2000-08-10
2001	2001-04-23	2001-09-10
2002	2002-04-16	2002-09-25
2003	2003-06-11	2003-08-31
2004	2004-05-11	2004-08-28
2005	2005-06-06	2005-09-24
2006	2006-05-29	2006-08-28
2007	2007-05-26	2007-10-09
2008	2008-06-07	2008-09-15
2010	2010-04-06	2010-09-26
2011	2011-05-24	2011-09-15
2012	2012-04-16	2012-09-08
2013	2013-04-10	2013-10-04
2014	2014-05-12	2014-09-12
2015	2015-05-12	2015-09-16
2016	2016-05-25	2016-10-19
2017	2017-04-29	2017-09-25
2018	2018-05-02	2018-10-04
2019	2019-05-19	2019-10-03
2022	2022-05-21	2022-09-20
2023	2023-04-07	2023-09-13
2024	2024-04-30	2024-09-02
2025	2025-05-03	2025-09-24
2026	2026-03-12	2026-10-15

Every Fixed Threshold

Fixed thresholds at Dover
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	116	95	2010	79
35 C (95 F): Days	100	23	1988	11
40 C (104 F): Days	3	1	1930	3
90 F (32.2 C): Days	116	56	1987	42
100 F (37.8 C): Days	29	7	1988	3
0 C (32 F): Ice days (max	114	23	1912	14
0 C (32 F): Frost days (min	117	117	1926	56
-10 C (14 F): Days with min	104	23	1940	14
-20 C (-4 F): Days with min	6	1	1928	1
20 C (68 F): Tropical nights (min	117	81	2018	71
25 C (77 F): Days with min	61	13	1908	2
10 mm (0.39 in): Days with 10 mm or more rain	101	54	2003	10
25 mm (0.98 in): Days with 25 mm or more rain	101	23	2018	2
50 mm (1.97 in): Days with 50 mm or more rain	91	10	1971	1
100 mm (3.94 in): Days with 100 mm or more rain	19	2	1939	1
200 mm (7.87 in): Days with 200 mm or more rain	1	1	1975	1
10 cm (3.9 in): Days with 10 cm or more snowfall	47	5	1966	1
25 cm (9.8 in): Days with 25 cm or more snowfall	6	2	1987	1
50 cm (19.7 in): Days with 50 cm or more snowfall	2	1	1979	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1893.

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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Dover Threshold Days by Year (USC00072730)

Key Facts for Dover Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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