Portland Intl AP Threshold Days by Year (USW00024229)
16 fixed thresholds counted per year at Portland Intl AP (USW00024229): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Portland Intl AP Thresholds
- Portland Intl AP: days with a maximum temperature at or above 30 C (86 F) in 88 years, most in 2021 with 53.
- Portland Intl AP: nights with a minimum temperature at or below 0 C (32 F) in 88 years, most in 1985 with 84.
- Portland Intl AP: days with 10 mm (0.39 in) or more of precipitation in 88 years, most in 1996 with 53.
- Portland Intl AP: days with a maximum temperature at or above 90 F (32.2 C) in 87 years, most in 2018 with 31.
- 16 fixed thresholds have at least one qualifying day at Portland Intl AP.
Days at or above 30 C (86 F)
88 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1939 | 27 | 27 |
| 1940 | 27 | 20.6 |
| 1941 | 18 | 20.6 |
| 1942 | 23 | 20.6 |
| 1943 | 20 | 20.6 |
| 1944 | 26 | 20.6 |
| 1945 | 26 | 20.6 |
| 1946 | 24 | 20.6 |
| 1947 | 12 | 20.6 |
| 1948 | 14 | 20.6 |
| 1949 | 16 | 20.6 |
| 1950 | 17 | 16.4 |
| 1951 | 22 | 16.4 |
| 1952 | 28 | 16.4 |
| 1953 | 14 | 16.4 |
| 1954 | 1 | 16.4 |
| 1955 | 10 | 16.4 |
| 1956 | 13 | 16.4 |
| 1957 | 11 | 16.4 |
| 1958 | 31 | 16.4 |
| 1959 | 17 | 16.4 |
| 1960 | 19 | 20.8 |
| 1961 | 26 | 20.8 |
| 1962 | 16 | 20.8 |
| 1963 | 9 | 20.8 |
| 1964 | 9 | 20.8 |
| 1965 | 25 | 20.8 |
| 1966 | 17 | 20.8 |
| 1967 | 42 | 20.8 |
| 1968 | 22 | 20.8 |
| 1969 | 23 | 20.8 |
| 1970 | 34 | 26.1 |
| 1971 | 22 | 26.1 |
| 1972 | 37 | 26.1 |
| 1973 | 30 | 26.1 |
| 1974 | 30 | 26.1 |
| 1975 | 24 | 26.1 |
| 1976 | 11 | 26.1 |
| 1977 | 24 | 26.1 |
| 1978 | 23 | 26.1 |
| 1979 | 26 | 26.1 |
| 1980 | 15 | 25.1 |
| 1981 | 28 | 25.1 |
| 1982 | 22 | 25.1 |
| 1983 | 10 | 25.1 |
| 1984 | 17 | 25.1 |
| 1985 | 33 | 25.1 |
| 1986 | 35 | 25.1 |
| 1987 | 45 | 25.1 |
| 1988 | 28 | 25.1 |
| 1989 | 18 | 25.1 |
| 1990 | 30 | 27.9 |
| 1991 | 32 | 27.9 |
| 1992 | 41 | 27.9 |
| 1993 | 20 | 27.9 |
| 1994 | 31 | 27.9 |
| 1995 | 23 | 27.9 |
| 1996 | 28 | 27.9 |
| 1997 | 20 | 27.9 |
| 1998 | 27 | 27.9 |
| 1999 | 27 | 27.9 |
| 2000 | 22 | 27.8 |
| 2001 | 14 | 27.8 |
| 2002 | 28 | 27.8 |
| 2003 | 39 | 27.8 |
| 2004 | 32 | 27.8 |
| 2005 | 22 | 27.8 |
| 2006 | 30 | 27.8 |
| 2007 | 21 | 27.8 |
| 2008 | 33 | 27.8 |
| 2009 | 37 | 27.8 |
| 2010 | 15 | 30.9 |
| 2011 | 20 | 30.9 |
| 2012 | 24 | 30.9 |
| 2013 | 21 | 30.9 |
| 2014 | 37 | 30.9 |
| 2015 | 45 | 30.9 |
| 2016 | 35 | 30.9 |
| 2017 | 44 | 30.9 |
| 2018 | 46 | 30.9 |
| 2019 | 22 | 30.9 |
| 2020 | 33 | 42.7 |
| 2021 | 53 | 42.7 |
| 2022 | 52 | 42.7 |
| 2023 | 50 | 42.7 |
| 2024 | 44 | 42.7 |
| 2025 | 37 | 42.7 |
| 2026 | 30 | 42.7 |
| Year | First date | Last date |
|---|---|---|
| 1939 | 1939-04-20 | 1939-09-21 |
| 1940 | 1940-05-09 | 1940-09-23 |
| 1941 | 1941-05-23 | 1941-08-19 |
| 1942 | 1942-06-29 | 1942-09-24 |
| 1943 | 1943-06-29 | 1943-09-24 |
| 1944 | 1944-05-04 | 1944-09-23 |
| 1945 | 1945-05-02 | 1945-09-12 |
| 1946 | 1946-06-19 | 1946-09-01 |
| 1947 | 1947-04-26 | 1947-09-24 |
| 1948 | 1948-06-02 | 1948-09-12 |
| 1949 | 1949-05-12 | 1949-09-27 |
| 1950 | 1950-06-03 | 1950-09-21 |
| 1951 | 1951-06-25 | 1951-09-17 |
| 1952 | 1952-05-27 | 1952-10-06 |
| 1953 | 1953-05-05 | 1953-09-10 |
| 1954 | 1954-05-17 | 1954-05-17 |
| 1955 | 1955-06-08 | 1955-09-06 |
| 1956 | 1956-05-16 | 1956-08-22 |
| 1957 | 1957-04-29 | 1957-09-23 |
| 1958 | 1958-05-17 | 1958-09-07 |
| 1959 | 1959-06-01 | 1959-09-02 |
| 1960 | 1960-06-23 | 1960-09-29 |
| 1961 | 1961-05-19 | 1961-08-22 |
| 1962 | 1962-07-07 | 1962-09-17 |
| 1963 | 1963-05-18 | 1963-09-09 |
| 1964 | 1964-07-11 | 1964-08-24 |
| 1965 | 1965-06-07 | 1965-09-24 |
| 1966 | 1966-05-04 | 1966-09-21 |
| 1967 | 1967-05-20 | 1967-09-27 |
| 1968 | 1968-06-24 | 1968-09-05 |
| 1969 | 1969-05-07 | 1969-09-11 |
| 1970 | 1970-05-15 | 1970-10-02 |
| 1971 | 1971-05-11 | 1971-08-28 |
| 1972 | 1972-05-27 | 1972-09-14 |
| 1973 | 1973-05-12 | 1973-09-10 |
| 1974 | 1974-06-10 | 1974-09-24 |
| 1975 | 1975-05-31 | 1975-10-01 |
| 1976 | 1976-06-18 | 1976-09-20 |
| 1977 | 1977-06-05 | 1977-09-12 |
| 1978 | 1978-06-02 | 1978-08-29 |
| 1979 | 1979-05-25 | 1979-10-03 |
| 1980 | 1980-07-07 | 1980-10-05 |
| 1981 | 1981-06-29 | 1981-09-16 |
| 1982 | 1982-06-09 | 1982-09-02 |
| 1983 | 1983-05-23 | 1983-08-13 |
| 1984 | 1984-05-28 | 1984-08-26 |
| 1985 | 1985-05-16 | 1985-08-26 |
| 1986 | 1986-05-25 | 1986-09-06 |
| 1987 | 1987-04-27 | 1987-10-06 |
| 1988 | 1988-05-11 | 1988-10-01 |
| 1989 | 1989-06-04 | 1989-09-28 |
| 1990 | 1990-05-04 | 1990-09-22 |
| 1991 | 1991-07-02 | 1991-10-11 |
| 1992 | 1992-05-03 | 1992-09-22 |
| 1993 | 1993-05-17 | 1993-09-29 |
| 1994 | 1994-07-07 | 1994-09-27 |
| 1995 | 1995-05-28 | 1995-09-20 |
| 1996 | 1996-06-02 | 1996-08-29 |
| 1997 | 1997-05-11 | 1997-09-24 |
| 1998 | 1998-04-29 | 1998-09-15 |
| 1999 | 1999-05-23 | 1999-09-22 |
| 2000 | 2000-06-04 | 2000-09-14 |
| 2001 | 2001-05-22 | 2001-09-30 |
| 2002 | 2002-06-12 | 2002-09-23 |
| 2003 | 2003-05-23 | 2003-09-27 |
| 2004 | 2004-04-26 | 2004-08-31 |
| 2005 | 2005-05-26 | 2005-08-26 |
| 2006 | 2006-05-15 | 2006-09-02 |
| 2007 | 2007-05-15 | 2007-09-11 |
| 2008 | 2008-05-15 | 2008-09-29 |
| 2009 | 2009-05-28 | 2009-09-23 |
| 2010 | 2010-07-07 | 2010-09-03 |
| 2011 | 2011-06-04 | 2011-09-23 |
| 2012 | 2012-05-13 | 2012-09-18 |
| 2013 | 2013-06-28 | 2013-09-11 |
| 2014 | 2014-05-01 | 2014-09-21 |
| 2015 | 2015-06-06 | 2015-09-12 |
| 2016 | 2016-04-18 | 2016-09-26 |
| 2017 | 2017-05-22 | 2017-09-28 |
| 2018 | 2018-04-26 | 2018-09-28 |
| 2019 | 2019-05-10 | 2019-09-05 |
| 2020 | 2020-05-09 | 2020-09-29 |
| 2021 | 2021-05-31 | 2021-09-24 |
| 2022 | 2022-06-25 | 2022-10-16 |
| 2023 | 2023-04-28 | 2023-10-06 |
| 2024 | 2024-05-10 | 2024-09-24 |
| 2025 | 2025-05-30 | 2025-09-23 |
| 2026 | 2026-05-03 | 2026-09-17 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 88 | 53 | 2021 | 30 |
| 35 C (95 F): Days | 75 | 14 | 2015 | 3 |
| 40 C (104 F): Days | 15 | 3 | 1981 | 1 |
| 45 C (113 F): Days | 1 | 1 | 2021 | 1 |
| 90 F (32.2 C): Days | 87 | 31 | 2018 | 18 |
| 100 F (37.8 C): Days | 52 | 5 | 1941 | 1 |
| 110 F (43.3 C): Days | 1 | 2 | 2021 | 2 |
| 0 C (32 F): Ice days (max | 52 | 18 | 1950 | 4 |
| 0 C (32 F): Frost days (min | 88 | 84 | 1985 | 14 |
| -10 C (14 F): Days with min | 26 | 13 | 1950 | 1 |
| 20 C (68 F): Tropical nights (min | 19 | 9 | 2021 | 2 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 88 | 53 | 1996 | 11 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 86 | 12 | 1996 | 3 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 27 | 3 | 1994 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 25 | 3 | 1949 | 1 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 2 | 1 | 1943 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1939.
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 (2026-10-12).