Walla Walla Post Office Threshold Days by Year (ASN00074117)

4 fixed thresholds counted per year at Walla Walla Post Office (ASN00074117): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Walla Walla Post Office Thresholds

Walla Walla Post Office: days with 10 mm (0.39 in) or more of precipitation in 88 years, most in 1973 with 36.
Walla Walla Post Office: days with 25 mm (0.98 in) or more of precipitation in 85 years, most in 2010 with 11.
Walla Walla Post Office: days with 50 mm (1.97 in) or more of precipitation in 28 years, most in 1931 with 3.
Walla Walla Post Office: days with 100 mm (3.94 in) or more of precipitation in 3 years, most in 1935 with 1.
4 fixed thresholds have at least one qualifying day at Walla Walla Post Office.

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

88 years with a qualifying day

Days per year at Walla Walla Post Office with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 36 in 1973.

Days with 10 mm (0.39 in) or more of precipitation per year at Walla Walla Post Office
Year	Days	Decade average
1925	20	18
1926	22	18
1927	11	18
1928	20	18
1929	17	18
1930	19	20.3
1931	23	20.3
1932	22	20.3
1933	16	20.3
1934	28	20.3
1935	22	20.3
1936	19	20.3
1937	15	20.3
1938	8	20.3
1939	31	20.3
1940	7	16.7
1941	12	16.7
1942	18	16.7
1943	19	16.7
1944	8	16.7
1945	18	16.7
1946	26	16.7
1947	23	16.7
1948	21	16.7
1949	15	16.7
1950	28	20.7
1951	15	20.7
1952	24	20.7
1953	19	20.7
1954	21	20.7
1955	23	20.7
1956	32	20.7
1957	10	20.7
1958	21	20.7
1959	14	20.7
1960	25	18.5
1961	16	18.5
1962	18	18.5
1963	17	18.5
1964	19	18.5
1965	11	18.5
1966	29	18.5
1967	10	18.5
1968	21	18.5
1969	19	18.5
1970	29	20.1
1971	11	20.1
1972	13	20.1
1973	36	20.1
1974	33	20.1
1975	17	20.1
1976	16	20.1
1977	11	20.1
1978	23	20.1
1979	12	20.1
1980	13	22
1981	27	22
1982	6	22
1983	25	22
1984	26	22
1985	20	22
1986	26	22
1987	22	22
1988	29	22
1989	26	22
1990	24	20.6
1991	16	20.6
1992	21	20.6
1994	12	20.6
1995	29	20.6
1996	29	20.6
1997	12	20.6
1998	18	20.6
1999	24	20.6
2000	22	14.9
2001	9	14.9
2002	9	14.9
2003	22	14.9
2004	16	14.9
2005	21	14.9
2006	7	14.9
2007	16	14.9
2008	16	14.9
2009	11	14.9
2010	26	17.8
2013	14	17.8
2014	14	17.8
2015	17	17.8

For each year, a bar from the first to the last day at Walla Walla Post Office meeting 10 mm (0.39 in).

First to last qualifying date each year at Walla Walla Post Office
Year	First date	Last date
1925	1925-01-03	1925-11-19
1926	1926-03-22	1926-12-18
1927	1927-01-06	1927-10-21
1928	1928-01-19	1928-11-04
1929	1929-01-26	1929-12-27
1930	1930-04-24	1930-12-25
1931	1931-02-14	1931-11-16
1932	1932-02-06	1932-11-14
1933	1933-01-25	1933-12-14
1934	1934-01-06	1934-12-28
1935	1935-01-05	1935-12-26
1936	1936-01-04	1936-12-21
1937	1937-01-19	1937-12-04
1938	1938-02-05	1938-08-29
1939	1939-02-17	1939-11-21
1940	1940-02-17	1940-12-28
1941	1941-01-03	1941-10-05
1942	1942-01-20	1942-11-23
1943	1943-01-01	1943-11-20
1944	1944-04-10	1944-12-13
1945	1945-01-11	1945-11-17
1946	1946-01-18	1946-12-28
1947	1947-02-10	1947-12-21
1948	1948-01-02	1948-12-30
1949	1949-02-21	1949-11-22
1950	1950-01-19	1950-12-30
1951	1951-02-20	1951-12-09
1952	1952-03-08	1952-12-08
1953	1953-01-06	1953-12-07
1954	1954-01-29	1954-12-13
1955	1955-02-11	1955-12-25
1956	1956-01-03	1956-12-13
1957	1957-03-11	1957-12-31
1958	1958-03-08	1958-12-16
1959	1959-02-15	1959-11-25
1960	1960-01-05	1960-12-30
1961	1961-01-03	1961-12-18
1962	1962-01-11	1962-11-21
1963	1963-01-03	1963-12-12
1964	1964-01-09	1964-12-23
1965	1965-05-28	1965-11-25
1966	1966-01-13	1966-12-15
1967	1967-01-29	1967-10-10
1968	1968-01-21	1968-12-24
1969	1969-01-27	1969-12-03
1970	1970-01-02	1970-12-09
1971	1971-02-05	1971-12-21
1972	1972-01-04	1972-11-25
1973	1973-01-13	1973-12-31
1974	1974-01-04	1974-11-27
1975	1975-01-26	1975-12-30
1976	1976-01-06	1976-12-24
1977	1977-01-02	1977-09-03
1978	1978-01-06	1978-12-26
1979	1979-01-18	1979-10-12
1980	1980-03-08	1980-12-29
1981	1981-01-29	1981-12-25
1982	1982-01-26	1982-05-29
1983	1983-02-12	1983-12-07
1984	1984-01-01	1984-10-27
1985	1985-03-18	1985-12-08
1986	1986-01-16	1986-12-08
1987	1987-02-16	1987-12-17
1988	1988-01-02	1988-12-11
1989	1989-03-11	1989-12-14
1990	1990-01-13	1990-10-22
1991	1991-01-24	1991-12-31
1992	1992-01-01	1992-11-21
1994	1994-01-07	1994-12-22
1995	1995-01-03	1995-11-30
1996	1996-01-01	1996-12-07
1997	1997-01-28	1997-11-01
1998	1998-02-08	1998-12-14
1999	1999-01-23	1999-12-28
2000	2000-02-23	2000-12-23
2001	2001-01-26	2001-10-24
2002	2002-01-22	2002-09-17
2003	2003-01-01	2003-12-22
2004	2004-04-07	2004-12-08
2005	2005-01-20	2005-11-08
2006	2006-03-16	2006-11-13
2007	2007-02-12	2007-12-22
2008	2008-01-19	2008-12-18
2009	2009-04-04	2009-12-25
2010	2010-02-05	2010-12-26
2013	2013-02-28	2013-12-05
2014	2014-01-25	2014-11-25
2015	2015-01-14	2015-12-23

Every Fixed Threshold

Fixed thresholds at Walla Walla Post Office
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	88	36	1973	17
25 mm (0.98 in): Days with 25 mm or more rain	85	11	2010	6
50 mm (1.97 in): Days with 50 mm or more rain	28	3	1931	3
100 mm (3.94 in): Days with 100 mm or more rain	3	1	1935	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1925.

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Data for Walla Walla Post Office 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).

Walla Walla Post Office Threshold Days by Year (ASN00074117)

Key Facts for Walla Walla Post Office Thresholds

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

Every Fixed Threshold

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