Delaware Threshold Days by Year (USC00332119)

19 fixed thresholds counted per year at Delaware (USC00332119): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Delaware Thresholds

Delaware: days with a maximum temperature at or above 30 C (86 F) in 99 years, most in 1934 with 92.
Delaware: days with a maximum temperature at or below 0 C (32 F) in 99 years, most in 1978 with 61.
Delaware: days with 10 mm (0.39 in) or more of precipitation in 98 years, most in 1927 with 43.
Delaware: days with 25 mm (0.98 in) or more of precipitation in 98 years, most in 1937 with 14.
19 fixed thresholds have at least one qualifying day at Delaware.

Days at or above 30 C (86 F)

99 years with a qualifying day

Days per year at Delaware with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 92 in 1934.

Days at or above 30 C (86 F) per year at Delaware
Year	Days	Decade average
1897	49	56.7
1898	49	56.7
1899	72	56.7
1900	74	47.7
1901	59	47.7
1902	40	47.7
1903	49	47.7
1904	28	47.7
1905	35	47.7
1906	53	47.7
1907	38	47.7
1908	65	47.7
1909	36	47.7
1910	53	58.1
1911	69	58.1
1912	45	58.1
1913	72	58.1
1914	72	58.1
1915	26	58.1
1916	65	58.1
1917	40	58.1
1918	68	58.1
1919	71	58.1
1920	51	55.8
1921	86	55.8
1922	68	55.8
1923	60	55.8
1924	43	55.8
1925	66	55.8
1926	52	55.8
1927	42	55.8
1928	48	55.8
1929	42	55.8
1930	76	73.8
1931	64	73.8
1932	76	73.8
1933	85	73.8
1934	92	73.8
1935	58	73.8
1936	77	73.8
1937	64	73.8
1938	68	73.8
1939	78	73.8
1940	57	51.5
1941	72	51.5
1942	49	51.5
1943	64	51.5
1944	70	51.5
1945	43	51.5
1946	37	51.5
1947	32	51.5
1948	42	51.5
1949	49	51.5
1950	14	48.5
1951	32	48.5
1952	57	48.5
1953	62	48.5
1954	63	48.5
1955	72	48.5
1956	45	48.5
1957	39	48.5
1958	24	48.5
1959	77	48.5
1960	45	42.6
1961	56	42.6
1962	71	42.6
1963	34	42.6
1964	43	42.6
1965	41	42.6
1966	37	42.6
1967	30	42.6
1968	39	42.6
1969	30	42.6
1970	43	31.8
1971	42	31.8
1972	23	31.8
1973	36	31.8
1974	27	31.8
1975	39	31.8
1976	18	31.8
1977	39	31.8
1978	33	31.8
1979	18	31.8
1980	41	34.9
1981	22	34.9
1982	25	34.9
1983	59	34.9
1984	38	34.9
1985	26	34.9
1986	30	34.9
1987	41	34.9
1988	54	34.9
1989	13	34.9
1991	61	35.2
1992	11	35.2
1993	38	35.2
1994	28	35.2
1995	38	35.2
1996	35	35.2

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

First to last qualifying date each year at Delaware
Year	First date	Last date
1897	1897-06-11	1897-10-16
1898	1898-06-06	1898-10-03
1899	1899-04-29	1899-10-14
1900	1900-05-13	1900-10-05
1901	1901-05-02	1901-09-07
1902	1902-05-04	1902-09-08
1903	1903-05-16	1903-09-15
1904	1904-05-25	1904-10-10
1905	1905-05-04	1905-09-28
1906	1906-05-15	1906-09-19
1907	1907-06-17	1907-09-20
1908	1908-05-25	1908-10-18
1909	1909-06-07	1909-09-19
1910	1910-06-16	1910-10-03
1911	1911-05-10	1911-09-24
1912	1912-05-22	1912-09-14
1913	1913-04-25	1913-09-11
1914	1914-04-18	1914-09-22
1915	1915-04-24	1915-09-16
1916	1916-05-24	1916-10-08
1917	1917-05-18	1917-09-15
1918	1918-05-05	1918-08-25
1919	1919-05-27	1919-10-04
1920	1920-05-23	1920-10-21
1921	1921-04-26	1921-09-29
1922	1922-05-11	1922-10-06
1923	1923-05-04	1923-09-27
1924	1924-05-06	1924-09-01
1925	1925-04-23	1925-09-20
1926	1926-04-30	1926-10-04
1927	1927-05-09	1927-10-02
1928	1928-05-03	1928-10-11
1929	1929-05-27	1929-09-28
1930	1930-04-11	1930-10-11
1931	1931-05-28	1931-09-22
1932	1932-05-21	1932-09-19
1933	1933-05-24	1933-09-26
1934	1934-05-04	1934-09-26
1935	1935-06-13	1935-09-25
1936	1936-05-07	1936-09-23
1937	1937-05-21	1937-10-01
1938	1938-04-27	1938-10-18
1939	1939-05-19	1939-10-09
1940	1940-05-06	1940-09-21
1941	1941-04-13	1941-09-30
1942	1942-04-30	1942-09-18
1943	1943-06-02	1943-09-04
1944	1944-05-12	1944-09-04
1945	1945-04-16	1945-09-23
1946	1946-06-07	1946-09-08
1947	1947-06-10	1947-09-20
1948	1948-04-26	1948-09-19
1949	1949-05-04	1949-08-27
1950	1950-05-25	1950-09-01
1951	1951-05-01	1951-10-05
1952	1952-05-05	1952-09-13
1953	1953-05-30	1953-10-20
1954	1954-04-21	1954-10-02
1955	1955-05-03	1955-09-19
1956	1956-05-12	1956-09-05
1957	1957-04-24	1957-09-02
1958	1958-04-18	1958-09-06
1959	1959-05-02	1959-10-05
1960	1960-04-23	1960-09-09
1961	1961-06-01	1961-09-24
1962	1962-04-25	1962-09-13
1963	1963-05-10	1963-10-08
1964	1964-05-20	1964-09-18
1965	1965-05-10	1965-09-20
1966	1966-06-10	1966-09-04
1967	1967-05-28	1967-09-17
1968	1968-06-07	1968-09-24
1969	1969-05-29	1969-09-02
1970	1970-05-21	1970-09-25
1971	1971-06-05	1971-10-03
1972	1972-05-26	1972-09-18
1973	1973-06-04	1973-09-28
1974	1974-06-10	1974-08-28
1975	1975-05-21	1975-08-29
1976	1976-06-09	1976-08-25
1977	1977-05-18	1977-09-06
1978	1978-05-28	1978-09-22
1979	1979-05-10	1979-09-05
1980	1980-06-07	1980-09-23
1981	1981-06-15	1981-08-29
1982	1982-05-07	1982-09-14
1983	1983-06-13	1983-09-20
1984	1984-06-06	1984-09-23
1985	1985-04-22	1985-09-10
1986	1986-04-28	1986-10-01
1987	1987-05-18	1987-08-19
1988	1988-05-16	1988-08-19
1989	1989-05-31	1989-09-10
1991	1991-05-14	1991-09-17
1992	1992-06-18	1992-08-27
1993	1993-05-10	1993-09-15
1994	1994-06-07	1994-09-17
1995	1995-06-19	1995-09-07
1996	1996-05-19	1996-09-09

Every Fixed Threshold

Fixed thresholds at Delaware
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	99	92	1934	35
35 C (95 F): Days	67	32	1934	2
40 C (104 F): Days	7	6	1934	5
90 F (32.2 C): Days	97	68	1934	12
100 F (37.8 C): Days	24	11	1934	2
110 F (43.3 C): Days	1	1	1934	1
0 C (32 F): Ice days (max	99	61	1978	42
0 C (32 F): Frost days (min	94	165	1988	123
-10 C (14 F): Days with min	94	60	1978	26
-20 C (-4 F): Days with min	71	23	1977	3
-30 C (-22 F): Days with min	2	2	1899	1
20 C (68 F): Tropical nights (min	94	66	1898	16
25 C (77 F): Days with min	6	5	1898	1
10 mm (0.39 in): Days with 10 mm or more rain	98	43	1927	42
25 mm (0.98 in): Days with 25 mm or more rain	98	14	1937	10
50 mm (1.97 in): Days with 50 mm or more rain	53	4	1946	1
100 mm (3.94 in): Days with 100 mm or more rain	4	1	1905	1
10 cm (3.9 in): Days with 10 cm or more snowfall	47	5	1951	2
25 cm (9.8 in): Days with 25 cm or more snowfall	2	1	1942	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1897.

Download the Data

Data for Delaware 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).

Delaware Threshold Days by Year (USC00332119)

Key Facts for Delaware Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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