Portland 1 SW Threshold Days by Year (USC00127069)
18 fixed thresholds counted per year at Portland 1 SW (USC00127069): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Portland 1 SW Thresholds
- Portland 1 SW: days with 10 mm (0.39 in) or more of precipitation in 69 years, most in 1990 with 48.
- Portland 1 SW: days with 25 mm (0.98 in) or more of precipitation in 69 years, most in 1957 with 16.
- Portland 1 SW: days with 10 cm (3.9 in) or more of snowfall in 51 years, most in 1966 with 5.
- Portland 1 SW: days with 50 mm (1.97 in) or more of precipitation in 44 years, most in 2015 with 5.
- 18 fixed thresholds have at least one qualifying day at Portland 1 SW.
Days at or above 30 C (86 F)
43 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1977 | 51 | 34.3 |
| 1978 | 36 | 34.3 |
| 1979 | 16 | 34.3 |
| 1980 | 39 | 37.9 |
| 1981 | 23 | 37.9 |
| 1982 | 34 | 37.9 |
| 1983 | 70 | 37.9 |
| 1984 | 32 | 37.9 |
| 1985 | 26 | 37.9 |
| 1986 | 29 | 37.9 |
| 1987 | 46 | 37.9 |
| 1988 | 57 | 37.9 |
| 1989 | 23 | 37.9 |
| 1990 | 25 | 33.6 |
| 1991 | 53 | 33.6 |
| 1992 | 9 | 33.6 |
| 1993 | 28 | 33.6 |
| 1994 | 29 | 33.6 |
| 1995 | 41 | 33.6 |
| 1996 | 32 | 33.6 |
| 1997 | 20 | 33.6 |
| 1998 | 44 | 33.6 |
| 1999 | 55 | 33.6 |
| 2000 | 14 | 21.3 |
| 2001 | 34 | 21.3 |
| 2003 | 20 | 21.3 |
| 2004 | 17 | 21.3 |
| 2010 | 52 | 39 |
| 2011 | 56 | 39 |
| 2012 | 59 | 39 |
| 2013 | 32 | 39 |
| 2014 | 17 | 39 |
| 2015 | 16 | 39 |
| 2016 | 48 | 39 |
| 2017 | 25 | 39 |
| 2018 | 46 | 39 |
| 2020 | 37 | 38.7 |
| 2021 | 40 | 38.7 |
| 2022 | 38 | 38.7 |
| 2023 | 24 | 38.7 |
| 2024 | 46 | 38.7 |
| 2025 | 56 | 38.7 |
| 2026 | 30 | 38.7 |
| Year | First date | Last date |
|---|---|---|
| 1977 | 1977-04-19 | 1977-09-06 |
| 1978 | 1978-05-29 | 1978-09-21 |
| 1979 | 1979-05-11 | 1979-08-31 |
| 1980 | 1980-05-30 | 1980-09-23 |
| 1981 | 1981-06-09 | 1981-09-13 |
| 1982 | 1982-05-07 | 1982-10-08 |
| 1983 | 1983-06-12 | 1983-10-04 |
| 1984 | 1984-06-03 | 1984-09-23 |
| 1985 | 1985-04-23 | 1985-09-10 |
| 1986 | 1986-04-27 | 1986-09-30 |
| 1987 | 1987-05-15 | 1987-09-12 |
| 1988 | 1988-05-16 | 1988-08-26 |
| 1989 | 1989-05-31 | 1989-08-28 |
| 1990 | 1990-04-26 | 1990-09-07 |
| 1991 | 1991-05-14 | 1991-09-17 |
| 1992 | 1992-06-17 | 1992-08-26 |
| 1993 | 1993-05-10 | 1993-08-31 |
| 1994 | 1994-05-23 | 1994-09-16 |
| 1995 | 1995-06-18 | 1995-09-07 |
| 1996 | 1996-05-19 | 1996-08-24 |
| 1997 | 1997-06-21 | 1997-10-05 |
| 1998 | 1998-05-15 | 1998-09-30 |
| 1999 | 1999-05-18 | 1999-09-29 |
| 2000 | 2000-06-02 | 2000-09-02 |
| 2001 | 2001-05-04 | 2001-09-08 |
| 2003 | 2003-06-24 | 2003-08-29 |
| 2004 | 2004-05-07 | 2004-09-24 |
| 2010 | 2010-05-27 | 2010-10-11 |
| 2011 | 2011-05-12 | 2011-09-14 |
| 2012 | 2012-05-20 | 2012-09-01 |
| 2013 | 2013-05-16 | 2013-09-12 |
| 2014 | 2014-05-09 | 2014-10-03 |
| 2015 | 2015-06-11 | 2015-09-09 |
| 2016 | 2016-05-28 | 2016-09-24 |
| 2017 | 2017-06-04 | 2017-09-26 |
| 2018 | 2018-05-15 | 2018-10-09 |
| 2020 | 2020-05-24 | 2020-09-03 |
| 2021 | 2021-05-24 | 2021-10-15 |
| 2022 | 2022-05-12 | 2022-09-22 |
| 2023 | 2023-05-31 | 2023-10-04 |
| 2024 | 2024-05-20 | 2024-09-22 |
| 2025 | 2025-06-04 | 2025-10-05 |
| 2026 | 2026-05-19 | 2026-08-17 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 43 | 70 | 1983 | 30 |
| 35 C (95 F): Days | 16 | 15 | 1988 | 2 |
| 40 C (104 F): Days | 1 | 1 | 2012 | 1 |
| 90 F (32.2 C): Days | 42 | 44 | 1988 | 9 |
| 100 F (37.8 C): Days | 3 | 3 | 1988 | 3 |
| 0 C (32 F): Ice days (max | 43 | 61 | 1978 | 27 |
| 0 C (32 F): Frost days (min | 40 | 152 | 1980 | 71 |
| -10 C (14 F): Days with min | 40 | 55 | 1977 | 24 |
| -20 C (-4 F): Days with min | 31 | 20 | 1978 | 6 |
| -30 C (-22 F): Days with min | 3 | 2 | 1985 | 2 |
| 20 C (68 F): Tropical nights (min | 40 | 28 | 1988 | 18 |
| 25 C (77 F): Days with min | 5 | 1 | 1990 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 69 | 48 | 1990 | 31 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 69 | 16 | 1957 | 11 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 44 | 5 | 2015 | 3 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 3 | 1 | 1958 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 51 | 5 | 1966 | 1 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 2 | 1 | 2014 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1977.
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).