Headworks Portland Wtr B Threshold Days by Year (USC00353770)
16 fixed thresholds counted per year at Headworks Portland Wtr B (USC00353770): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Headworks Portland Wtr B Thresholds
- Headworks Portland Wtr B: days with 10 mm (0.39 in) or more of precipitation in 124 years, most in 1933 with 107.
- Headworks Portland Wtr B: days with 25 mm (0.98 in) or more of precipitation in 124 years, most in 1933 with 44.
- Headworks Portland Wtr B: nights with a minimum temperature at or below 0 C (32 F) in 120 years, most in 1922 with 108.
- Headworks Portland Wtr B: days with a maximum temperature at or above 30 C (86 F) in 117 years, most in 1958 with 46.
- 16 fixed thresholds have at least one qualifying day at Headworks Portland Wtr B.
Days at or above 30 C (86 F)
117 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1900 | 5 | 12 |
| 1907 | 15 | 12 |
| 1908 | 22 | 12 |
| 1909 | 6 | 12 |
| 1910 | 17 | 19.8 |
| 1911 | 16 | 19.8 |
| 1912 | 19 | 19.8 |
| 1913 | 20 | 19.8 |
| 1914 | 18 | 19.8 |
| 1915 | 16 | 19.8 |
| 1916 | 14 | 19.8 |
| 1917 | 27 | 19.8 |
| 1918 | 26 | 19.8 |
| 1919 | 25 | 19.8 |
| 1920 | 14 | 23.3 |
| 1921 | 8 | 23.3 |
| 1922 | 33 | 23.3 |
| 1923 | 20 | 23.3 |
| 1924 | 33 | 23.3 |
| 1925 | 22 | 23.3 |
| 1926 | 30 | 23.3 |
| 1927 | 25 | 23.3 |
| 1928 | 12 | 23.3 |
| 1929 | 36 | 23.3 |
| 1930 | 20 | 19.3 |
| 1931 | 25 | 19.3 |
| 1932 | 22 | 19.3 |
| 1933 | 19 | 19.3 |
| 1934 | 9 | 19.3 |
| 1935 | 23 | 19.3 |
| 1936 | 9 | 19.3 |
| 1937 | 17 | 19.3 |
| 1938 | 24 | 19.3 |
| 1939 | 25 | 19.3 |
| 1940 | 21 | 16.8 |
| 1941 | 19 | 16.8 |
| 1942 | 21 | 16.8 |
| 1943 | 14 | 16.8 |
| 1944 | 23 | 16.8 |
| 1945 | 24 | 16.8 |
| 1946 | 16 | 16.8 |
| 1947 | 7 | 16.8 |
| 1948 | 10 | 16.8 |
| 1949 | 13 | 16.8 |
| 1950 | 21 | 20.1 |
| 1951 | 24 | 20.1 |
| 1952 | 33 | 20.1 |
| 1953 | 15 | 20.1 |
| 1954 | 3 | 20.1 |
| 1955 | 13 | 20.1 |
| 1956 | 16 | 20.1 |
| 1957 | 12 | 20.1 |
| 1958 | 46 | 20.1 |
| 1959 | 18 | 20.1 |
| 1960 | 17 | 14.9 |
| 1961 | 30 | 14.9 |
| 1962 | 15 | 14.9 |
| 1963 | 10 | 14.9 |
| 1964 | 7 | 14.9 |
| 1965 | 12 | 14.9 |
| 1966 | 11 | 14.9 |
| 1967 | 31 | 14.9 |
| 1968 | 14 | 14.9 |
| 1969 | 2 | 14.9 |
| 1970 | 20 | 15.9 |
| 1971 | 17 | 15.9 |
| 1972 | 24 | 15.9 |
| 1973 | 19 | 15.9 |
| 1974 | 17 | 15.9 |
| 1975 | 13 | 15.9 |
| 1976 | 4 | 15.9 |
| 1977 | 20 | 15.9 |
| 1978 | 13 | 15.9 |
| 1979 | 12 | 15.9 |
| 1980 | 9 | 18.8 |
| 1981 | 23 | 18.8 |
| 1982 | 12 | 18.8 |
| 1983 | 10 | 18.8 |
| 1984 | 16 | 18.8 |
| 1985 | 30 | 18.8 |
| 1986 | 23 | 18.8 |
| 1988 | 35 | 18.8 |
| 1989 | 11 | 18.8 |
| 1990 | 37 | 30.8 |
| 1991 | 31 | 30.8 |
| 1992 | 41 | 30.8 |
| 1993 | 26 | 30.8 |
| 1994 | 38 | 30.8 |
| 1995 | 20 | 30.8 |
| 1996 | 37 | 30.8 |
| 1998 | 27 | 30.8 |
| 1999 | 20 | 30.8 |
| 2000 | 10 | 15.5 |
| 2001 | 9 | 15.5 |
| 2002 | 12 | 15.5 |
| 2003 | 24 | 15.5 |
| 2004 | 10 | 15.5 |
| 2005 | 16 | 15.5 |
| 2006 | 22 | 15.5 |
| 2009 | 21 | 15.5 |
| 2010 | 11 | 15.1 |
| 2011 | 4 | 15.1 |
| 2012 | 12 | 15.1 |
| 2013 | 6 | 15.1 |
| 2014 | 14 | 15.1 |
| 2015 | 20 | 15.1 |
| 2016 | 15 | 15.1 |
| 2017 | 28 | 15.1 |
| 2018 | 33 | 15.1 |
| 2019 | 8 | 15.1 |
| 2020 | 10 | 14.3 |
| 2021 | 17 | 14.3 |
| 2022 | 19 | 14.3 |
| 2023 | 15 | 14.3 |
| 2024 | 16 | 14.3 |
| 2025 | 14 | 14.3 |
| 2026 | 9 | 14.3 |
| Year | First date | Last date |
|---|---|---|
| 1900 | 1900-06-12 | 1900-07-22 |
| 1907 | 1907-05-30 | 1907-09-09 |
| 1908 | 1908-06-29 | 1908-09-04 |
| 1909 | 1909-05-31 | 1909-09-05 |
| 1910 | 1910-04-22 | 1910-09-02 |
| 1911 | 1911-07-05 | 1911-08-26 |
| 1912 | 1912-05-12 | 1912-09-25 |
| 1913 | 1913-06-01 | 1913-09-20 |
| 1914 | 1914-05-13 | 1914-09-23 |
| 1915 | 1915-06-29 | 1915-09-20 |
| 1916 | 1916-06-12 | 1916-09-15 |
| 1917 | 1917-06-13 | 1917-08-31 |
| 1918 | 1918-06-04 | 1918-09-28 |
| 1919 | 1919-07-08 | 1919-09-23 |
| 1920 | 1920-06-03 | 1920-08-22 |
| 1921 | 1921-07-07 | 1921-08-11 |
| 1922 | 1922-05-14 | 1922-09-12 |
| 1923 | 1923-06-05 | 1923-10-01 |
| 1924 | 1924-05-08 | 1924-09-12 |
| 1925 | 1925-05-05 | 1925-09-22 |
| 1926 | 1926-04-14 | 1926-09-04 |
| 1927 | 1927-06-20 | 1927-08-19 |
| 1928 | 1928-05-20 | 1928-09-21 |
| 1929 | 1929-05-18 | 1929-09-16 |
| 1930 | 1930-06-14 | 1930-09-19 |
| 1931 | 1931-04-28 | 1931-09-04 |
| 1932 | 1932-06-09 | 1932-10-05 |
| 1933 | 1933-06-12 | 1933-08-26 |
| 1934 | 1934-05-22 | 1934-09-03 |
| 1935 | 1935-06-04 | 1935-09-29 |
| 1936 | 1936-05-12 | 1936-09-29 |
| 1937 | 1937-06-01 | 1937-09-14 |
| 1938 | 1938-05-23 | 1938-10-01 |
| 1939 | 1939-05-13 | 1939-09-21 |
| 1940 | 1940-05-09 | 1940-09-08 |
| 1941 | 1941-05-22 | 1941-08-20 |
| 1942 | 1942-06-29 | 1942-09-24 |
| 1943 | 1943-06-28 | 1943-09-24 |
| 1944 | 1944-05-27 | 1944-09-10 |
| 1945 | 1945-05-01 | 1945-09-12 |
| 1946 | 1946-06-19 | 1946-08-22 |
| 1947 | 1947-05-23 | 1947-09-23 |
| 1948 | 1948-05-24 | 1948-09-10 |
| 1949 | 1949-06-05 | 1949-09-27 |
| 1950 | 1950-05-25 | 1950-09-21 |
| 1951 | 1951-05-21 | 1951-09-17 |
| 1952 | 1952-05-27 | 1952-10-06 |
| 1953 | 1953-05-05 | 1953-09-10 |
| 1954 | 1954-05-07 | 1954-09-25 |
| 1955 | 1955-06-07 | 1955-09-06 |
| 1956 | 1956-05-16 | 1956-08-22 |
| 1957 | 1957-04-29 | 1957-09-23 |
| 1958 | 1958-05-15 | 1958-10-02 |
| 1959 | 1959-06-18 | 1959-09-02 |
| 1960 | 1960-07-05 | 1960-10-05 |
| 1961 | 1961-06-01 | 1961-08-22 |
| 1962 | 1962-07-21 | 1962-09-24 |
| 1963 | 1963-05-18 | 1963-09-09 |
| 1964 | 1964-07-11 | 1964-08-24 |
| 1965 | 1965-06-07 | 1965-08-31 |
| 1966 | 1966-06-15 | 1966-09-21 |
| 1967 | 1967-06-16 | 1967-09-27 |
| 1968 | 1968-06-25 | 1968-09-05 |
| 1969 | 1969-05-22 | 1969-09-07 |
| 1970 | 1970-05-15 | 1970-10-02 |
| 1971 | 1971-05-11 | 1971-08-24 |
| 1972 | 1972-05-27 | 1972-09-14 |
| 1973 | 1973-05-13 | 1973-09-10 |
| 1974 | 1974-06-29 | 1974-09-24 |
| 1975 | 1975-05-13 | 1975-09-30 |
| 1976 | 1976-06-18 | 1976-07-27 |
| 1977 | 1977-06-05 | 1977-09-12 |
| 1978 | 1978-06-02 | 1978-08-09 |
| 1979 | 1979-06-02 | 1979-09-24 |
| 1980 | 1980-07-21 | 1980-10-06 |
| 1981 | 1981-07-02 | 1981-09-16 |
| 1982 | 1982-06-10 | 1982-09-02 |
| 1983 | 1983-05-18 | 1983-08-25 |
| 1984 | 1984-05-28 | 1984-08-27 |
| 1985 | 1985-06-17 | 1985-08-27 |
| 1986 | 1986-05-30 | 1986-09-05 |
| 1988 | 1988-05-21 | 1988-10-09 |
| 1989 | 1989-06-04 | 1989-09-28 |
| 1990 | 1990-05-04 | 1990-09-23 |
| 1991 | 1991-07-02 | 1991-10-14 |
| 1992 | 1992-05-03 | 1992-09-29 |
| 1993 | 1993-05-10 | 1993-10-02 |
| 1994 | 1994-05-07 | 1994-09-23 |
| 1995 | 1995-05-30 | 1995-09-14 |
| 1996 | 1996-06-02 | 1996-10-09 |
| 1998 | 1998-04-29 | 1998-09-15 |
| 1999 | 1999-05-23 | 1999-09-22 |
| 2000 | 2000-06-25 | 2000-09-14 |
| 2001 | 2001-05-21 | 2001-08-12 |
| 2002 | 2002-06-12 | 2002-09-23 |
| 2003 | 2003-05-27 | 2003-09-27 |
| 2004 | 2004-06-17 | 2004-08-11 |
| 2005 | 2005-05-26 | 2005-08-25 |
| 2006 | 2006-05-15 | 2006-09-02 |
| 2009 | 2009-07-01 | 2009-09-22 |
| 2010 | 2010-07-07 | 2010-08-25 |
| 2011 | 2011-08-20 | 2011-09-11 |
| 2012 | 2012-05-13 | 2012-09-17 |
| 2013 | 2013-06-30 | 2013-09-11 |
| 2014 | 2014-05-01 | 2014-09-20 |
| 2015 | 2015-06-08 | 2015-09-11 |
| 2016 | 2016-04-18 | 2016-08-26 |
| 2017 | 2017-06-23 | 2017-09-11 |
| 2018 | 2018-04-25 | 2018-09-05 |
| 2019 | 2019-07-25 | 2019-09-05 |
| 2020 | 2020-05-28 | 2020-09-29 |
| 2021 | 2021-06-01 | 2021-08-15 |
| 2022 | 2022-06-26 | 2022-09-25 |
| 2023 | 2023-06-06 | 2023-09-15 |
| 2024 | 2024-07-05 | 2024-09-06 |
| 2025 | 2025-06-08 | 2025-08-26 |
| 2026 | 2026-05-03 | 2026-08-24 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 117 | 46 | 1958 | 9 |
| 35 C (95 F): Days | 94 | 16 | 1996 | 1 |
| 40 C (104 F): Days | 18 | 3 | 1941 | 1 |
| 90 F (32.2 C): Days | 115 | 27 | 1996 | 2 |
| 100 F (37.8 C): Days | 50 | 4 | 1935 | 1 |
| 110 F (43.3 C): Days | 1 | 1 | 1935 | 1 |
| 0 C (32 F): Ice days (max | 77 | 16 | 1916 | 1 |
| 0 C (32 F): Frost days (min | 120 | 108 | 1922 | 14 |
| -10 C (14 F): Days with min | 43 | 12 | 1924 | 2 |
| 20 C (68 F): Tropical nights (min | 16 | 8 | 1921 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 124 | 107 | 1933 | 34 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 124 | 44 | 1933 | 4 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 113 | 11 | 1933 | 3 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 13 | 2 | 1933 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 49 | 11 | 1937 | 1 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 7 | 1 | 1923 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1900.
Download the Data
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 . Last revised (2026-10-17).