Dover 1 W Threshold Days by Year (USC00402589)

17 fixed thresholds counted per year at Dover 1 W (USC00402589): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Dover 1 W Thresholds

Dover 1 W: days with 10 mm (0.39 in) or more of precipitation in 110 years, most in 1950 with 67.
Dover 1 W: days with 25 mm (0.98 in) or more of precipitation in 110 years, most in 1923 with 26.
Dover 1 W: nights with a minimum temperature at or below 0 C (32 F) in 106 years, most in 1976 with 122.
Dover 1 W: nights with a minimum temperature at or above 20 C (68 F) in 106 years, most in 1998 with 79.
17 fixed thresholds have at least one qualifying day at Dover 1 W.

Days at or above 30 C (86 F)

104 years with a qualifying day

Days per year at Dover 1 W with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 132 in 1908.

Days at or above 30 C (86 F) per year at Dover 1 W
Year	Days	Decade average
1898	108	112
1899	116	112
1904	105	115.5
1905	117	115.5
1906	124	115.5
1907	110	115.5
1908	132	115.5
1909	105	115.5
1910	104	91.7
1911	109	91.7
1912	97	91.7
1913	110	91.7
1915	67	91.7
1916	84	91.7
1917	59	91.7
1918	92	91.7
1919	103	91.7
1920	96	90.7
1921	126	90.7
1923	72	90.7
1924	93	90.7
1925	115	90.7
1926	89	90.7
1927	77	90.7
1928	68	90.7
1929	80	90.7
1930	99	97.6
1931	109	97.6
1932	92	97.6
1933	104	97.6
1934	93	97.6
1935	84	97.6
1936	117	97.6
1937	93	97.6
1938	84	97.6
1939	101	97.6
1940	92	93.8
1941	128	93.8
1942	98	93.8
1943	102	93.8
1944	106	93.8
1945	71	93.8
1946	75	93.8
1947	93	93.8
1948	89	93.8
1949	84	93.8
1950	54	93.8
1951	99	93.8
1952	105	93.8
1953	125	93.8
1954	109	93.8
1955	93	93.8
1956	100	93.8
1957	82	93.8
1958	86	93.8
1959	85	93.8
1960	83	80
1961	74	80
1962	87	80
1963	79	80
1964	94	80
1966	67	80
1967	57	80
1968	87	80
1969	92	80
1970	85	77.2
1971	80	77.2
1972	79	77.2
1973	88	77.2
1974	59	77.2
1975	88	77.2
1976	56	77.2
1977	95	77.2
1979	65	77.2
1980	98	77.8
1981	69	77.8
1982	73	77.8
1983	95	77.8
1984	79	77.8
1985	77	77.8
1986	72	77.8
1988	83	77.8
1989	54	77.8
1990	66	63.1
1991	68	63.1
1992	33	63.1
1994	53	63.1
1995	69	63.1
1996	53	63.1
1997	51	63.1
1998	92	63.1
1999	83	63.1
2000	74	65.5
2001	60	65.5
2002	83	65.5
2003	46	65.5
2005	79	65.5
2006	68	65.5
2008	71	65.5
2009	43	65.5
2010	110	97
2011	83	97
2012	98	97
2026	87	87

For each year, a bar from the first to the last day at Dover 1 W meeting 30 C (86 F).

First to last qualifying date each year at Dover 1 W
Year	First date	Last date
1898	1898-04-30	1898-10-10
1899	1899-04-13	1899-09-16
1904	1904-05-06	1904-10-18
1905	1905-04-01	1905-10-08
1906	1906-04-12	1906-10-23
1907	1907-03-21	1907-10-02
1908	1908-04-20	1908-10-21
1909	1909-04-17	1909-11-05
1910	1910-03-23	1910-10-19
1911	1911-03-11	1911-09-29
1912	1912-05-02	1912-10-12
1913	1913-04-18	1913-10-10
1915	1915-04-19	1915-09-27
1916	1916-05-08	1916-10-09
1917	1917-04-18	1917-10-17
1918	1918-05-09	1918-10-06
1919	1919-05-29	1919-10-26
1920	1920-04-18	1920-10-23
1921	1921-03-15	1921-10-26
1923	1923-04-22	1923-09-30
1924	1924-04-08	1924-10-30
1925	1925-04-18	1925-10-04
1926	1926-05-01	1926-10-04
1927	1927-04-28	1927-10-23
1928	1928-05-03	1928-10-14
1929	1929-03-23	1929-09-29
1930	1930-04-10	1930-09-25
1931	1931-04-16	1931-10-13
1932	1932-05-07	1932-09-18
1933	1933-05-19	1933-09-30
1934	1934-04-04	1934-09-26
1935	1935-03-21	1935-10-16
1936	1936-04-14	1936-09-28
1937	1937-04-14	1937-10-30
1938	1938-04-26	1938-10-18
1939	1939-05-25	1939-10-23
1940	1940-05-06	1940-10-28
1941	1941-04-12	1941-10-21
1942	1942-04-27	1942-09-20
1943	1943-04-26	1943-09-30
1944	1944-05-11	1944-10-06
1945	1945-03-16	1945-09-28
1946	1946-04-02	1946-10-07
1947	1947-04-10	1947-10-24
1948	1948-04-25	1948-09-22
1949	1949-05-04	1949-10-11
1950	1950-05-05	1950-10-31
1951	1951-04-28	1951-10-06
1952	1952-05-01	1952-10-01
1953	1953-04-09	1953-10-22
1954	1954-04-07	1954-10-05
1955	1955-04-16	1955-10-06
1956	1956-04-27	1956-10-06
1957	1957-04-19	1957-09-11
1958	1958-05-03	1958-09-26
1959	1959-04-07	1959-10-05
1960	1960-04-22	1960-10-02
1961	1961-04-23	1961-10-10
1962	1962-04-27	1962-09-13
1963	1963-03-31	1963-10-22
1964	1964-04-18	1964-10-27
1966	1966-05-09	1966-09-11
1967	1967-03-14	1967-10-06
1968	1968-05-03	1968-10-03
1969	1969-04-17	1969-10-13
1970	1970-05-01	1970-09-27
1971	1971-04-20	1971-10-05
1972	1972-05-20	1972-09-23
1973	1973-05-10	1973-10-05
1974	1974-05-18	1974-09-13
1975	1975-04-28	1975-10-15
1976	1976-06-09	1976-09-27
1977	1977-04-12	1977-09-19
1979	1979-05-08	1979-10-21
1980	1980-04-23	1980-09-23
1981	1981-04-01	1981-10-01
1982	1982-03-19	1982-10-07
1983	1983-06-11	1983-10-05
1984	1984-04-26	1984-09-26
1985	1985-04-19	1985-10-14
1986	1986-05-01	1986-10-01
1988	1988-04-06	1988-09-24
1989	1989-04-24	1989-09-14
1990	1990-04-24	1990-09-15
1991	1991-05-18	1991-09-17
1992	1992-04-16	1992-09-08
1994	1994-04-28	1994-09-15
1995	1995-04-10	1995-09-15
1996	1996-05-18	1996-09-09
1997	1997-05-19	1997-09-20
1998	1998-05-13	1998-10-06
1999	1999-06-04	1999-09-29
2000	2000-05-12	2000-10-06
2001	2001-04-10	2001-09-14
2002	2002-04-16	2002-09-20
2003	2003-04-29	2003-09-02
2005	2005-05-12	2005-10-20
2006	2006-04-15	2006-10-05
2008	2008-05-24	2008-09-30
2009	2009-06-02	2009-08-28
2010	2010-04-06	2010-10-13
2011	2011-04-10	2011-09-18
2012	2012-03-21	2012-09-08
2026	2026-03-22	2026-10-10

Every Fixed Threshold

Fixed thresholds at Dover 1 W
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	104	132	1908	87
35 C (95 F): Days	91	62	1899	10
40 C (104 F): Days	14	11	1930	4
90 F (32.2 C): Days	104	95	1899	40
100 F (37.8 C): Days	51	27	1930	13
0 C (32 F): Ice days (max	100	26	1979	4
0 C (32 F): Frost days (min	106	122	1976	24
-10 C (14 F): Days with min	104	41	1977	2
-20 C (-4 F): Days with min	29	5	1899	1
-30 C (-22 F): Days with min	1	1	1963	1
20 C (68 F): Tropical nights (min	106	79	1998	82
25 C (77 F): Days with min	33	6	2010	4
10 mm (0.39 in): Days with 10 mm or more rain	110	67	1950	28
25 mm (0.98 in): Days with 25 mm or more rain	110	26	1923	9
50 mm (1.97 in): Days with 50 mm or more rain	106	12	1957	1
100 mm (3.94 in): Days with 100 mm or more rain	22	2	1906	1
10 cm (3.9 in): Days with 10 cm or more snowfall	23	3	1960	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1898.

Download the Data

Data for Dover 1 W 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 1 W Threshold Days by Year (USC00402589)

Key Facts for Dover 1 W Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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