Forest Grove Threshold Days by Year

4 fixed thresholds counted per year at Forest Grove (ASN00009547): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Forest Grove Thresholds

Forest Grove: days with 10 mm (0.39 in) or more of precipitation in 96 years, most in 1978 with 54.
Forest Grove: days with 25 mm (0.98 in) or more of precipitation in 96 years, most in 1961 with 19.
Forest Grove: days with 50 mm (1.97 in) or more of precipitation in 56 years, most in 1934 with 4.
Forest Grove: days with 100 mm (3.94 in) or more of precipitation in 5 years, most in 1934 with 1.
4 fixed thresholds have at least one qualifying day at Forest Grove.

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

96 years with a qualifying day

Days per year at Forest Grove with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 54 in 1978.

Days with 10 mm (0.39 in) or more of precipitation per year at Forest Grove
Year	Days	Decade average
1926	50	44
1928	45	44
1929	37	44
1930	40	40.5
1931	38	40.5
1932	35	40.5
1933	40	40.5
1934	50	40.5
1935	33	40.5
1936	37	40.5
1937	42	40.5
1938	46	40.5
1939	44	40.5
1940	20	38.7
1941	40	38.7
1942	49	38.7
1943	42	38.7
1944	28	38.7
1945	43	38.7
1946	40	38.7
1947	50	38.7
1948	41	38.7
1949	34	38.7
1950	40	38.6
1951	34	38.6
1952	41	38.6
1953	32	38.6
1954	37	38.6
1955	51	38.6
1956	40	38.6
1957	45	38.6
1958	35	38.6
1959	31	38.6
1960	29	36.3
1961	43	36.3
1962	36	36.3
1963	47	36.3
1964	37	36.3
1965	39	36.3
1966	25	36.3
1967	41	36.3
1969	30	36.3
1970	44	40.2
1971	33	40.2
1972	29	40.2
1973	52	40.2
1974	52	40.2
1975	39	40.2
1976	33	40.2
1977	31	40.2
1978	54	40.2
1979	35	40.2
1980	32	38.2
1981	40	38.2
1982	31	38.2
1983	40	38.2
1985	35	38.2
1986	40	38.2
1987	31	38.2
1988	50	38.2
1989	45	38.2
1990	45	39.4
1991	50	39.4
1992	46	39.4
1993	29	39.4
1994	31	39.4
1995	39	39.4
1996	44	39.4
1997	34	39.4
1998	33	39.4
1999	43	39.4
2000	46	37.2
2001	30	37.2
2003	41	37.2
2004	34	37.2
2005	34	37.2
2006	26	37.2
2007	37	37.2
2008	47	37.2
2009	40	37.2
2010	24	31.2
2011	35	31.2
2012	26	31.2
2013	39	31.2
2014	29	31.2
2015	30	31.2
2016	34	31.2
2017	33	31.2
2018	33	31.2
2019	29	31.2
2020	36	35.7
2021	34	35.7
2022	41	35.7
2023	28	35.7
2024	30	35.7
2025	45	35.7

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

First to last qualifying date each year at Forest Grove
Year	First date	Last date
1926	1926-02-24	1926-11-27
1928	1928-04-02	1928-10-18
1929	1929-03-17	1929-12-25
1930	1930-04-15	1930-11-03
1931	1931-04-12	1931-12-18
1932	1932-04-28	1932-11-30
1933	1933-03-06	1933-10-19
1934	1934-01-03	1934-11-06
1935	1935-02-24	1935-10-23
1936	1936-01-11	1936-09-30
1937	1937-02-11	1937-12-05
1938	1938-02-28	1938-12-04
1939	1939-01-20	1939-10-04
1940	1940-05-14	1940-10-01
1941	1941-03-17	1941-11-16
1942	1942-03-15	1942-11-12
1943	1943-03-09	1943-09-20
1944	1944-03-14	1944-12-06
1945	1945-03-25	1945-12-25
1946	1946-04-19	1946-12-23
1947	1947-02-17	1947-10-25
1948	1948-04-08	1948-12-23
1949	1949-01-26	1949-11-07
1950	1950-01-04	1950-11-08
1951	1951-02-14	1951-11-30
1952	1952-03-28	1952-11-13
1953	1953-02-02	1953-11-16
1954	1954-01-14	1954-11-11
1955	1955-02-01	1955-12-09
1956	1956-03-04	1956-12-05
1957	1957-03-18	1957-10-20
1958	1958-02-13	1958-10-14
1959	1959-04-12	1959-12-31
1960	1960-01-01	1960-10-10
1961	1961-02-19	1961-12-15
1962	1962-02-16	1962-12-29
1963	1963-01-30	1963-10-17
1964	1964-03-04	1964-12-19
1965	1965-03-01	1965-12-20
1966	1966-04-20	1966-12-27
1967	1967-03-15	1967-12-08
1969	1969-03-10	1969-11-16
1970	1970-02-05	1970-11-11
1971	1971-01-07	1971-11-16
1972	1972-04-19	1972-10-28
1973	1973-04-09	1973-10-29
1974	1974-01-27	1974-11-18
1975	1975-03-20	1975-10-17
1976	1976-04-12	1976-11-28
1977	1977-01-18	1977-12-22
1978	1978-04-13	1978-11-24
1979	1979-02-26	1979-11-13
1980	1980-04-03	1980-12-29
1981	1981-03-06	1981-11-26
1982	1982-01-03	1982-11-04
1983	1983-02-05	1983-12-31
1985	1985-01-18	1985-11-22
1986	1986-01-09	1986-10-17
1987	1987-03-17	1987-11-02
1988	1988-03-25	1988-11-07
1989	1989-02-16	1989-12-24
1990	1990-02-14	1990-11-17
1991	1991-04-09	1991-11-13
1992	1992-03-17	1992-11-30
1993	1993-03-19	1993-10-01
1994	1994-02-05	1994-10-14
1995	1995-04-14	1995-12-24
1996	1996-05-05	1996-12-12
1997	1997-02-25	1997-11-28
1998	1998-03-09	1998-10-16
1999	1999-05-05	1999-10-16
2000	2000-01-15	2000-11-27
2001	2001-05-06	2001-12-05
2003	2003-02-16	2003-11-18
2004	2004-01-29	2004-11-17
2005	2005-03-10	2005-10-31
2006	2006-01-25	2006-11-29
2007	2007-01-03	2007-12-17
2008	2008-03-08	2008-11-23
2009	2009-02-26	2009-09-28
2010	2010-04-12	2010-09-08
2011	2011-01-06	2011-11-04
2012	2012-04-18	2012-11-29
2013	2013-03-15	2013-11-29
2014	2014-03-29	2014-11-07
2015	2015-03-15	2015-12-06
2016	2016-05-21	2016-12-12
2017	2017-03-22	2017-12-19
2018	2018-01-17	2018-12-06
2019	2019-01-23	2019-12-07
2020	2020-03-15	2020-11-15
2021	2021-02-07	2021-10-26
2022	2022-02-07	2022-11-18
2023	2023-03-03	2023-10-02
2024	2024-05-02	2024-10-21
2025	2025-04-04	2025-11-05

Every Fixed Threshold

Fixed thresholds at Forest Grove
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	96	54	1978	45
25 mm (0.98 in): Days with 25 mm or more rain	96	19	1961	12
50 mm (1.97 in): Days with 50 mm or more rain	56	4	1934	1
100 mm (3.94 in): Days with 100 mm or more rain	5	1	1934	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1926.

Download the Data

Data for Forest Grove 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).

Forest Grove Threshold Days by Year

Key Facts for Forest Grove Thresholds

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

Every Fixed Threshold

Download the Data

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