Delaware 3 WSW Threshold Days by Year (USC00132136)

19 fixed thresholds counted per year at Delaware 3 WSW (USC00132136): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Delaware 3 WSW Thresholds

Delaware 3 WSW: nights with a minimum temperature at or below 0 C (32 F) in 63 years, most in 1907 with 178.
Delaware 3 WSW: nights with a minimum temperature at or below -10 C (14 F) in 63 years, most in 1972 with 86.
Delaware 3 WSW: nights with a minimum temperature at or below -20 C (-4 F) in 63 years, most in 1963 with 47.
Delaware 3 WSW: days with a maximum temperature at or above 30 C (86 F) in 62 years, most in 1901 with 72.
19 fixed thresholds have at least one qualifying day at Delaware 3 WSW.

Days at or above 30 C (86 F)

62 years with a qualifying day

Days per year at Delaware 3 WSW with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 72 in 1901.

Days at or above 30 C (86 F) per year at Delaware 3 WSW
Year	Days	Decade average
1899	34	34
1900	34	27.8
1901	72	27.8
1902	18	27.8
1903	14	27.8
1904	16	27.8
1905	25	27.8
1906	28	27.8
1907	16	27.8
1909	27	27.8
1910	54	32.5
1911	42	32.5
1912	35	32.5
1915	3	32.5
1916	48	32.5
1917	17	32.5
1918	27	32.5
1919	34	32.5
1931	65	54.4
1932	32	54.4
1933	63	54.4
1934	59	54.4
1935	51	54.4
1936	65	54.4
1937	57	54.4
1938	41	54.4
1939	57	54.4
1940	37	37.1
1941	48	37.1
1942	24	37.1
1943	43	37.1
1944	37	37.1
1945	24	37.1
1946	28	37.1
1947	47	37.1
1948	43	37.1
1949	40	37.1
1950	14	34.6
1951	9	34.6
1952	51	34.6
1953	36	34.6
1954	42	34.6
1955	56	34.6
1956	39	34.6
1957	33	34.6
1958	21	34.6
1959	45	34.6
1961	25	25.4
1962	18	25.4
1963	39	25.4
1964	34	25.4
1965	22	25.4
1966	32	25.4
1967	15	25.4
1968	28	25.4
1969	16	25.4
1970	33	30.2
1971	31	30.2
1972	30	30.2
1973	29	30.2
1974	20	30.2
1975	38	30.2

For each year, a bar from the first to the last day at Delaware 3 WSW meeting 30 C (86 F).

First to last qualifying date each year at Delaware 3 WSW
Year	First date	Last date
1899	1899-05-12	1899-09-16
1900	1900-05-12	1900-09-10
1901	1901-04-30	1901-09-07
1902	1902-05-20	1902-08-02
1903	1903-06-30	1903-08-24
1904	1904-05-22	1904-09-28
1905	1905-06-04	1905-08-29
1906	1906-06-06	1906-09-16
1907	1907-06-16	1907-09-01
1909	1909-06-21	1909-08-26
1910	1910-04-29	1910-08-24
1911	1911-05-10	1911-09-14
1912	1912-06-25	1912-09-09
1915	1915-07-15	1915-07-31
1916	1916-06-29	1916-10-07
1917	1917-06-30	1917-09-05
1918	1918-05-03	1918-08-25
1919	1919-05-30	1919-09-20
1931	1931-05-27	1931-09-20
1932	1932-05-14	1932-08-30
1933	1933-06-02	1933-09-23
1934	1934-05-05	1934-08-18
1935	1935-06-12	1935-09-24
1936	1936-05-06	1936-09-22
1937	1937-05-29	1937-09-23
1938	1938-06-21	1938-10-04
1939	1939-04-24	1939-10-07
1940	1940-05-13	1940-09-21
1941	1941-05-15	1941-09-21
1942	1942-04-30	1942-09-11
1943	1943-05-28	1943-09-03
1944	1944-05-14	1944-08-16
1945	1945-06-23	1945-09-07
1946	1946-06-10	1946-09-06
1947	1947-06-09	1947-10-14
1948	1948-05-20	1948-09-19
1949	1949-05-03	1949-08-27
1950	1950-05-24	1950-10-18
1951	1951-07-07	1951-08-30
1952	1952-04-28	1952-09-30
1953	1953-05-25	1953-10-18
1954	1954-06-09	1954-10-03
1955	1955-05-23	1955-09-18
1956	1956-05-22	1956-10-13
1957	1957-06-05	1957-09-01
1958	1958-05-14	1958-09-03
1959	1959-05-02	1959-09-09
1961	1961-05-14	1961-09-11
1962	1962-05-17	1962-09-13
1963	1963-05-09	1963-10-07
1964	1964-05-19	1964-09-10
1965	1965-05-03	1965-09-10
1966	1966-05-27	1966-09-02
1967	1967-05-19	1967-08-17
1968	1968-06-05	1968-08-24
1969	1969-05-29	1969-08-31
1970	1970-04-29	1970-09-21
1971	1971-06-05	1971-10-02
1972	1972-05-20	1972-09-17
1973	1973-06-09	1973-09-03
1974	1974-06-21	1974-08-27
1975	1975-05-19	1975-10-14

Every Fixed Threshold

Fixed thresholds at Delaware 3 WSW
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	62	72	1901	38
35 C (95 F): Days	39	26	1936	2
40 C (104 F): Days	4	8	1936	8
90 F (32.2 C): Days	61	48	1931	14
100 F (37.8 C): Days	10	14	1936	1
110 F (43.3 C): Days	1	1	1931	1
0 C (32 F): Ice days (max	62	87	1950	84
0 C (32 F): Frost days (min	63	178	1907	166
-10 C (14 F): Days with min	63	86	1972	71
-20 C (-4 F): Days with min	63	47	1963	17
-30 C (-22 F): Days with min	32	10	1963	2
20 C (68 F): Tropical nights (min	61	27	1931	12
25 C (77 F): Days with min	1	0	n/a	1
10 mm (0.39 in): Days with 10 mm or more rain	26	39	1951	26
25 mm (0.98 in): Days with 25 mm or more rain	26	13	1961	3
50 mm (1.97 in): Days with 50 mm or more rain	22	4	1961	1
100 mm (3.94 in): Days with 100 mm or more rain	3	1	1951	1
10 cm (3.9 in): Days with 10 cm or more snowfall	31	6	1951	3
25 cm (9.8 in): Days with 25 cm or more snowfall	4	1	1961	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1899.

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Data for Delaware 3 WSW 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 3 WSW Threshold Days by Year (USC00132136)

Key Facts for Delaware 3 WSW Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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