Portland Threshold Days by Year (ASN00090070)

4 fixed thresholds counted per year at Portland (ASN00090070): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Portland Thresholds

Portland: days with 10 mm (0.39 in) or more of precipitation in 129 years, most in 1968 with 40.
Portland: days with 25 mm (0.98 in) or more of precipitation in 116 years, most in 2013 with 14.
Portland: days with 50 mm (1.97 in) or more of precipitation in 26 years, most in 2013 with 6.
Portland: days with 100 mm (3.94 in) or more of precipitation in 1 years, most in 1946 with 1.
4 fixed thresholds have at least one qualifying day at Portland.

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

129 years with a qualifying day

Days per year at Portland with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 40 in 1968.

Days with 10 mm (0.39 in) or more of precipitation per year at Portland
Year	Days	Decade average
1872	26	21.4
1873	19	21.4
1874	24	21.4
1875	24	21.4
1876	21	21.4
1877	14	21.4
1878	23	21.4
1879	20	21.4
1880	23	24
1881	23	24
1882	18	24
1883	27	24
1884	26	24
1885	23	24
1886	29	24
1887	25	24
1888	21	24
1889	25	24
1890	28	25.2
1891	22	25.2
1892	26	25.2
1893	28	25.2
1894	33	25.2
1895	27	25.2
1896	25	25.2
1897	16	25.2
1898	20	25.2
1899	27	25.2
1900	19	21.8
1902	16	21.8
1903	22	21.8
1904	20	21.8
1905	31	21.8
1906	24	21.8
1907	18	21.8
1908	17	21.8
1909	29	21.8
1910	33	22.6
1911	18	22.6
1912	16	22.6
1913	19	22.6
1914	11	22.6
1915	25	22.6
1916	22	22.6
1917	33	22.6
1918	23	22.6
1919	26	22.6
1920	28	25
1921	21	25
1922	20	25
1923	34	25
1924	22	25
1931	24	25.4
1932	21	25.4
1933	33	25.4
1934	23	25.4
1935	28	25.4
1936	23	25.4
1937	25	25.4
1938	26	25.4
1940	15	25.7
1941	24	25.7
1942	36	25.7
1943	27	25.7
1944	20	25.7
1945	31	25.7
1946	34	25.7
1947	31	25.7
1948	19	25.7
1949	20	25.7
1950	11	24.3
1951	31	24.3
1952	32	24.3
1953	25	24.3
1954	17	24.3
1955	30	24.3
1956	31	24.3
1957	22	24.3
1958	29	24.3
1959	15	24.3
1960	26	22.6
1961	13	22.6
1962	28	22.6
1963	12	22.6
1964	32	22.6
1965	23	22.6
1966	21	22.6
1967	9	22.6
1968	40	22.6
1969	22	22.6
1970	32	24.5
1971	34	24.5
1972	22	24.5
1973	30	24.5
1974	22	24.5
1975	20	24.5
1976	20	24.5
1977	21	24.5
1978	20	24.5
1979	24	24.5
1980	18	20.8
1981	24	20.8
1982	13	20.8
1983	24	20.8
1984	21	20.8
1985	22	20.8
1986	29	20.8
1987	13	20.8
1988	25	20.8
1989	19	20.8
1990	24	18.6
1991	21	18.6
1992	22	18.6
1993	12	18.6
1997	19	18.6
1998	17	18.6
1999	15	18.6
2000	24	21
2002	15	21
2004	28	21
2005	17	21
2010	28	23.6
2011	23	23.6
2012	26	23.6
2013	26	23.6
2015	15	23.6
2022	21	17.7
2023	21	17.7
2026	11	17.7

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

First to last qualifying date each year at Portland
Year	First date	Last date
1872	1872-01-11	1872-12-26
1873	1873-03-19	1873-11-14
1874	1874-01-12	1874-12-23
1875	1875-02-04	1875-12-28
1876	1876-01-07	1876-12-27
1877	1877-02-15	1877-12-05
1878	1878-02-02	1878-12-25
1879	1879-02-21	1879-12-07
1880	1880-02-25	1880-10-27
1881	1881-01-28	1881-11-25
1882	1882-01-30	1882-11-22
1883	1883-01-01	1883-10-28
1884	1884-01-21	1884-12-15
1885	1885-01-06	1885-12-23
1886	1886-01-06	1886-12-19
1887	1887-01-14	1887-11-06
1888	1888-02-04	1888-12-14
1889	1889-01-03	1889-12-21
1890	1890-01-22	1890-12-28
1891	1891-01-05	1891-12-16
1892	1892-03-26	1892-12-14
1893	1893-01-19	1893-11-19
1894	1894-01-31	1894-12-28
1895	1895-01-04	1895-12-01
1896	1896-01-18	1896-12-28
1897	1897-01-05	1897-11-01
1898	1898-03-14	1898-12-08
1899	1899-01-30	1899-12-27
1900	1900-01-10	1900-10-05
1902	1902-02-12	1902-12-20
1903	1903-01-06	1903-12-11
1904	1904-01-03	1904-11-03
1905	1905-01-29	1905-12-10
1906	1906-02-28	1906-11-28
1907	1907-04-05	1907-11-23
1908	1908-02-08	1908-10-17
1909	1909-01-05	1909-11-22
1910	1910-02-05	1910-12-23
1911	1911-02-05	1911-12-12
1912	1912-02-23	1912-12-10
1913	1913-01-30	1913-12-25
1914	1914-02-28	1914-10-31
1915	1915-03-07	1915-10-04
1916	1916-01-28	1916-12-29
1917	1917-02-15	1917-12-31
1918	1918-01-15	1918-12-03
1919	1919-01-07	1919-10-21
1920	1920-02-29	1920-11-05
1921	1921-01-02	1921-12-03
1922	1922-04-05	1922-12-30
1923	1923-05-10	1923-12-14
1924	1924-01-11	1924-11-07
1931	1931-01-25	1931-11-17
1932	1932-01-12	1932-12-01
1933	1933-03-04	1933-12-16
1934	1934-04-03	1934-11-30
1935	1935-01-05	1935-12-11
1936	1936-03-13	1936-12-13
1937	1937-01-19	1937-12-26
1938	1938-01-14	1938-12-27
1940	1940-01-05	1940-11-11
1941	1941-01-24	1941-11-19
1942	1942-01-20	1942-12-19
1943	1943-02-18	1943-10-17
1944	1944-01-03	1944-12-23
1945	1945-01-31	1945-12-27
1946	1946-01-05	1946-12-07
1947	1947-02-16	1947-12-25
1948	1948-03-01	1948-11-08
1949	1949-01-14	1949-11-29
1950	1950-04-05	1950-12-20
1951	1951-04-05	1951-12-18
1952	1952-01-24	1952-11-11
1953	1953-04-27	1953-12-09
1954	1954-01-28	1954-12-12
1955	1955-01-28	1955-12-02
1956	1956-03-03	1956-12-19
1957	1957-02-07	1957-12-26
1958	1958-01-30	1958-11-14
1959	1959-02-07	1959-12-27
1960	1960-01-09	1960-10-08
1961	1961-04-16	1961-12-15
1962	1962-03-15	1962-12-11
1963	1963-01-14	1963-10-28
1964	1964-01-15	1964-12-23
1965	1965-03-12	1965-12-07
1966	1966-03-16	1966-12-19
1967	1967-01-13	1967-12-13
1968	1968-03-29	1968-12-25
1969	1969-02-10	1969-12-11
1970	1970-01-01	1970-12-31
1971	1971-03-15	1971-12-31
1972	1972-01-09	1972-11-12
1973	1973-01-14	1973-12-03
1974	1974-02-01	1974-12-20
1975	1975-01-11	1975-12-14
1976	1976-02-09	1976-12-23
1977	1977-01-17	1977-11-29
1978	1978-01-24	1978-12-05
1979	1979-05-03	1979-12-17
1980	1980-04-16	1980-12-16
1981	1981-01-10	1981-10-03
1982	1982-01-07	1982-11-18
1983	1983-03-22	1983-11-30
1984	1984-03-11	1984-11-10
1985	1985-03-16	1985-12-17
1986	1986-04-16	1986-12-17
1987	1987-02-20	1987-08-24
1988	1988-01-01	1988-12-03
1989	1989-03-10	1989-10-27
1990	1990-02-02	1990-12-09
1991	1991-01-23	1991-11-07
1992	1992-04-05	1992-12-03
1993	1993-01-27	1993-12-15
1997	1997-01-22	1997-12-05
1998	1998-01-14	1998-12-20
1999	1999-02-12	1999-12-03
2000	2000-01-04	2000-11-09
2002	2002-01-01	2002-12-31
2004	2004-01-08	2004-12-11
2005	2005-01-05	2005-11-03
2010	2010-02-05	2010-12-20
2011	2011-02-21	2011-12-19
2012	2012-01-23	2012-12-17
2013	2013-02-04	2013-12-23
2015	2015-01-13	2015-09-21
2022	2022-01-07	2022-12-14
2023	2023-01-30	2023-12-29
2026	2026-05-05	2026-09-09

Every Fixed Threshold

Fixed thresholds at Portland
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	129	40	1968	11
25 mm (0.98 in): Days with 25 mm or more rain	116	14	2013	1
50 mm (1.97 in): Days with 50 mm or more rain	26	6	2013	2
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1946	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 Portland 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 2026-10-12. Last revised 12 October 2026 (2026-10-12).

Portland Threshold Days by Year (ASN00090070)

Key Facts for Portland Thresholds

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

Every Fixed Threshold

Download the Data

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