Washington Threshold Days by Year (USW00093725)

18 fixed thresholds counted per year at Washington (USW00093725): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Washington Thresholds

Washington: days with 10 mm (0.39 in) or more of precipitation in 98 years, most in 1889 with 52.
Washington: days with 25 mm (0.98 in) or more of precipitation in 98 years, most in 1878 with 21.
Washington: days with a maximum temperature at or above 30 C (86 F) in 94 years, most in 1959 with 93.
Washington: days with a maximum temperature at or above 90 F (32.2 C) in 94 years, most in 1872 with 59.
18 fixed thresholds have at least one qualifying day at Washington.

Days at or above 30 C (86 F)

94 years with a qualifying day

Days per year at Washington with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 93 in 1959.

Days at or above 30 C (86 F) per year at Washington
Year	Days	Decade average
1872	85	60.9
1873	72	60.9
1874	61	60.9
1875	43	60.9
1876	60	60.9
1877	59	60.9
1878	49	60.9
1879	58	60.9
1880	72	49.9
1881	83	49.9
1882	52	49.9
1883	52	49.9
1884	65	49.9
1885	42	49.9
1886	23	49.9
1887	43	49.9
1888	40	49.9
1889	27	49.9
1890	40	51.8
1891	34	51.8
1892	48	51.8
1893	48	51.8
1894	62	51.8
1895	63	51.8
1896	58	51.8
1897	46	51.8
1898	61	51.8
1899	58	51.8
1900	74	47.9
1901	56	47.9
1902	47	47.9
1903	40	47.9
1904	34	47.9
1905	39	47.9
1906	51	47.9
1907	37	47.9
1908	53	47.9
1909	48	47.9
1910	51	55.1
1911	75	55.1
1912	51	55.1
1913	56	55.1
1914	68	55.1
1915	57	55.1
1916	51	55.1
1917	42	55.1
1918	50	55.1
1919	50	55.1
1920	41	52.9
1921	65	52.9
1922	50	52.9
1923	52	52.9
1924	44	52.9
1925	69	52.9
1926	57	52.9
1927	41	52.9
1928	50	52.9
1929	60	52.9
1930	89	67.2
1931	71	67.2
1932	67	67.2
1933	65	67.2
1934	65	67.2
1935	57	67.2
1936	67	67.2
1937	57	67.2
1938	60	67.2
1939	74	67.2
1940	45	67.3
1941	77	67.3
1942	60	67.3
1943	80	67.3
1944	76	67.3
1945	70	67.3
1946	61	67.3
1947	74	67.3
1948	59	67.3
1949	71	67.3
1950	53	70
1951	71	70
1952	74	70
1953	73	70
1954	74	70
1955	65	70
1956	64	70
1957	80	70
1958	53	70
1959	93	70
1960	68	64
1961	63	64
1962	56	64
1963	73	64
1964	68	64
1965	56	64

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

First to last qualifying date each year at Washington
Year	First date	Last date
1872	1872-04-26	1872-09-24
1873	1873-04-09	1873-09-05
1874	1874-05-09	1874-09-12
1875	1875-05-09	1875-09-06
1876	1876-05-20	1876-09-08
1877	1877-05-16	1877-09-01
1878	1878-05-02	1878-09-20
1879	1879-04-26	1879-10-09
1880	1880-05-06	1880-09-20
1881	1881-04-26	1881-10-16
1882	1882-05-09	1882-09-20
1883	1883-05-04	1883-09-17
1884	1884-05-02	1884-10-08
1885	1885-04-22	1885-09-15
1886	1886-04-24	1886-09-28
1887	1887-05-03	1887-09-07
1888	1888-04-29	1888-08-26
1889	1889-05-08	1889-09-16
1890	1890-05-01	1890-09-07
1891	1891-05-10	1891-09-27
1892	1892-05-02	1892-09-05
1893	1893-05-21	1893-09-22
1894	1894-05-02	1894-09-16
1895	1895-04-25	1895-09-26
1896	1896-04-13	1896-09-19
1897	1897-04-24	1897-10-16
1898	1898-05-02	1898-09-19
1899	1899-05-01	1899-09-08
1900	1900-05-08	1900-10-06
1901	1901-04-30	1901-09-16
1902	1902-04-22	1902-09-08
1903	1903-04-29	1903-09-17
1904	1904-05-24	1904-10-10
1905	1905-05-04	1905-10-01
1906	1906-04-30	1906-09-23
1907	1907-03-22	1907-09-21
1908	1908-04-24	1908-10-17
1909	1909-04-19	1909-08-29
1910	1910-03-30	1910-10-05
1911	1911-05-01	1911-09-25
1912	1912-05-20	1912-10-11
1913	1913-04-23	1913-09-08
1914	1914-04-22	1914-10-10
1915	1915-04-19	1915-09-17
1916	1916-05-01	1916-10-08
1917	1917-05-18	1917-09-02
1918	1918-05-05	1918-09-05
1919	1919-05-04	1919-10-28
1920	1920-05-11	1920-09-25
1921	1921-03-21	1921-09-29
1922	1922-04-08	1922-10-05
1923	1923-05-27	1923-09-04
1924	1924-05-06	1924-09-13
1925	1925-04-23	1925-09-21
1926	1926-04-22	1926-10-05
1927	1927-04-20	1927-10-02
1928	1928-05-04	1928-10-13
1929	1929-04-06	1929-09-29
1930	1930-04-11	1930-09-26
1931	1931-05-16	1931-10-08
1932	1932-05-07	1932-09-23
1933	1933-05-20	1933-10-01
1934	1934-05-05	1934-09-27
1935	1935-04-27	1935-09-21
1936	1936-04-15	1936-09-23
1937	1937-04-18	1937-09-04
1938	1938-04-20	1938-10-19
1939	1939-04-24	1939-10-10
1940	1940-05-07	1940-09-21
1941	1941-04-14	1941-10-07
1942	1942-04-06	1942-09-19
1943	1943-05-06	1943-09-16
1944	1944-05-01	1944-10-07
1945	1945-03-16	1945-09-29
1946	1946-04-23	1946-10-31
1947	1947-04-06	1947-10-23
1948	1948-03-21	1948-09-20
1949	1949-04-26	1949-10-11
1950	1950-05-06	1950-11-01
1951	1951-04-29	1951-10-06
1952	1952-04-20	1952-09-14
1953	1953-04-25	1953-09-30
1954	1954-04-19	1954-10-13
1955	1955-05-05	1955-09-20
1956	1956-04-28	1956-09-23
1957	1957-04-21	1957-09-22
1958	1958-04-19	1958-10-10
1959	1959-04-08	1959-10-06
1960	1960-04-14	1960-09-09
1961	1961-04-25	1961-09-22
1962	1962-04-22	1962-10-12
1963	1963-03-30	1963-10-07
1964	1964-04-17	1964-09-23
1965	1965-05-03	1965-09-23

Every Fixed Threshold

Fixed thresholds at Washington
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	94	93	1959	56
35 C (95 F): Days	89	26	1930	1
40 C (104 F): Days	6	2	1918	1
90 F (32.2 C): Days	94	59	1872	21
100 F (37.8 C): Days	32	11	1930	1
0 C (32 F): Ice days (max	94	35	1904	10
0 C (32 F): Frost days (min	94	118	1904	80
-10 C (14 F): Days with min	83	21	1872	6
-20 C (-4 F): Days with min	7	4	1899	1
20 C (68 F): Tropical nights (min	94	86	1959	32
25 C (77 F): Days with min	47	8	1952	2
10 mm (0.39 in): Days with 10 mm or more rain	98	52	1889	23
25 mm (0.98 in): Days with 25 mm or more rain	98	21	1878	7
50 mm (1.97 in): Days with 50 mm or more rain	81	6	1878	4
100 mm (3.94 in): Days with 100 mm or more rain	17	2	1955	1
10 cm (3.9 in): Days with 10 cm or more snowfall	58	6	1899	1
25 cm (9.8 in): Days with 25 cm or more snowfall	11	1	1890	1
50 cm (19.7 in): Days with 50 cm or more snowfall	1	1	1922	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1872.

Download the Data

Data for Washington 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).

Washington Threshold Days by Year (USW00093725)

Key Facts for Washington Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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