Washington Dam 19 Threshold Days by Year (USC00469309)

6 fixed thresholds counted per year at Washington Dam 19 (USC00469309): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Washington Dam 19 Thresholds

Washington Dam 19: days with 10 mm (0.39 in) or more of precipitation in 50 years, most in 1923 with 49.
Washington Dam 19: days with 25 mm (0.98 in) or more of precipitation in 50 years, most in 1926 with 14.
Washington Dam 19: days with 50 mm (1.97 in) or more of precipitation in 28 years, most in 1921 with 4.
Washington Dam 19: days with 10 cm (3.9 in) or more of snowfall in 3 years, most in 1966 with 2.
6 fixed thresholds have at least one qualifying day at Washington Dam 19.

Days with 10 mm (0.39 in) or more of precipitation

50 years with a qualifying day

Days per year at Washington Dam 19 with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 49 in 1923.

Days with 10 mm (0.39 in) or more of precipitation per year at Washington Dam 19
Year	Days	Decade average
1917	41	40
1918	40	40
1919	39	40
1920	34	38.8
1921	40	38.8
1922	34	38.8
1923	49	38.8
1924	34	38.8
1925	25	38.8
1926	45	38.8
1927	44	38.8
1928	37	38.8
1929	46	38.8
1930	16	29.8
1931	37	29.8
1932	25	29.8
1933	37	29.8
1934	22	29.8
1935	43	29.8
1936	22	29.8
1938	30	29.8
1939	36	29.8
1940	34	32.3
1941	32	32.3
1942	36	32.3
1943	25	32.3
1944	35	32.3
1945	39	32.3
1946	32	32.3
1947	30	32.3
1948	37	32.3
1949	23	32.3
1950	40	34
1951	36	34
1952	36	34
1953	21	34
1954	28	34
1955	31	34
1956	41	34
1957	34	34
1958	42	34
1959	31	34
1960	24	29.4
1961	39	29.4
1962	32	29.4
1963	18	29.4
1964	30	29.4
1965	31	29.4
1966	29	29.4
1967	32	29.4

For each year, a bar from the first to the last day at Washington Dam 19 meeting 10 mm (0.39 in).

First to last qualifying date each year at Washington Dam 19
Year	First date	Last date
1917	1917-01-03	1917-11-28
1918	1918-01-03	1918-12-22
1919	1919-01-01	1919-12-14
1920	1920-01-09	1920-12-23
1921	1921-01-08	1921-12-24
1922	1922-01-11	1922-12-28
1923	1923-01-01	1923-12-31
1924	1924-01-03	1924-12-24
1925	1925-01-17	1925-11-13
1926	1926-01-09	1926-12-29
1927	1927-01-19	1927-12-16
1928	1928-01-20	1928-12-18
1929	1929-01-10	1929-12-23
1930	1930-01-28	1930-12-27
1931	1931-01-06	1931-12-14
1932	1932-01-01	1932-12-31
1933	1933-01-21	1933-12-18
1934	1934-01-07	1934-12-26
1935	1935-01-01	1935-12-14
1936	1936-01-03	1936-12-31
1938	1938-01-25	1938-12-27
1939	1939-01-05	1939-12-27
1940	1940-02-11	1940-12-28
1941	1941-01-25	1941-12-13
1942	1942-01-02	1942-12-31
1943	1943-01-17	1943-12-27
1944	1944-02-15	1944-12-28
1945	1945-01-01	1945-12-06
1946	1946-01-07	1946-12-29
1947	1947-01-02	1947-12-16
1948	1948-01-13	1948-12-16
1949	1949-01-05	1949-12-27
1950	1950-01-03	1950-12-08
1951	1951-01-04	1951-12-31
1952	1952-01-02	1952-12-10
1953	1953-01-01	1953-12-14
1954	1954-01-11	1954-12-30
1955	1955-02-02	1955-11-16
1956	1956-01-29	1956-12-21
1957	1957-01-10	1957-12-26
1958	1958-01-14	1958-11-29
1959	1959-01-02	1959-12-28
1960	1960-01-03	1960-12-21
1961	1961-01-01	1961-12-24
1962	1962-01-07	1962-12-30
1963	1963-01-11	1963-11-30
1964	1964-01-02	1964-12-12
1965	1965-01-02	1965-11-27
1966	1966-01-01	1966-12-11
1967	1967-01-27	1967-12-22

Every Fixed Threshold

Fixed thresholds at Washington Dam 19
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
10 mm (0.39 in): Days with 10 mm or more rain	50	49	1923	32
25 mm (0.98 in): Days with 25 mm or more rain	50	14	1926	6
50 mm (1.97 in): Days with 50 mm or more rain	28	4	1921	1
100 mm (3.94 in): Days with 100 mm or more rain	2	1	1920	1
10 cm (3.9 in): Days with 10 cm or more snowfall	3	2	1966	1
25 cm (9.8 in): Days with 25 cm or more snowfall	1	1	1966	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1917.

Download the Data

Data for Washington Dam 19 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 Dam 19 Threshold Days by Year (USC00469309)

Key Facts for Washington Dam 19 Thresholds

Days with 10 mm (0.39 in) or more of precipitation

Every Fixed Threshold

Download the Data

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