Ice Harbor Dam Threshold Days by Year (USC00453883)
17 fixed thresholds counted per year at Ice Harbor Dam (USC00453883): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Ice Harbor Dam Thresholds
- Ice Harbor Dam: days with a maximum temperature at or above 30 C (86 F) in 58 years, most in 1958 with 92.
- Ice Harbor Dam: days with a maximum temperature at or above 90 F (32.2 C) in 58 years, most in 1958 with 75.
- Ice Harbor Dam: days with a maximum temperature at or above 35 C (95 F) in 57 years, most in 1958 with 58.
- Ice Harbor Dam: days with a maximum temperature at or below 0 C (32 F) in 56 years, most in 1960 with 33.
- 17 fixed thresholds have at least one qualifying day at Ice Harbor Dam.
Days at or above 30 C (86 F)
58 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1958 | 92 | 73.5 |
| 1959 | 55 | 73.5 |
| 1960 | 76 | 66.6 |
| 1961 | 78 | 66.6 |
| 1962 | 65 | 66.6 |
| 1963 | 71 | 66.6 |
| 1964 | 45 | 66.6 |
| 1965 | 52 | 66.6 |
| 1966 | 67 | 66.6 |
| 1967 | 89 | 66.6 |
| 1968 | 54 | 66.6 |
| 1969 | 69 | 66.6 |
| 1970 | 68 | 54.9 |
| 1971 | 52 | 54.9 |
| 1972 | 39 | 54.9 |
| 1973 | 60 | 54.9 |
| 1974 | 62 | 54.9 |
| 1975 | 54 | 54.9 |
| 1976 | 49 | 54.9 |
| 1977 | 63 | 54.9 |
| 1978 | 47 | 54.9 |
| 1981 | 55 | 56 |
| 1982 | 55 | 56 |
| 1983 | 44 | 56 |
| 1984 | 54 | 56 |
| 1986 | 52 | 56 |
| 1987 | 80 | 56 |
| 1988 | 67 | 56 |
| 1989 | 41 | 56 |
| 1990 | 61 | 56.7 |
| 1991 | 48 | 56.7 |
| 1992 | 58 | 56.7 |
| 1994 | 69 | 56.7 |
| 1995 | 47 | 56.7 |
| 1996 | 52 | 56.7 |
| 1997 | 55 | 56.7 |
| 1998 | 68 | 56.7 |
| 1999 | 52 | 56.7 |
| 2000 | 57 | 61 |
| 2001 | 63 | 61 |
| 2002 | 58 | 61 |
| 2003 | 74 | 61 |
| 2004 | 59 | 61 |
| 2005 | 54 | 61 |
| 2006 | 66 | 61 |
| 2007 | 65 | 61 |
| 2008 | 52 | 61 |
| 2009 | 62 | 61 |
| 2010 | 44 | 59 |
| 2011 | 51 | 59 |
| 2016 | 57 | 59 |
| 2017 | 77 | 59 |
| 2018 | 56 | 59 |
| 2019 | 69 | 59 |
| 2020 | 63 | 53 |
| 2021 | 72 | 53 |
| 2022 | 64 | 53 |
| 2026 | 13 | 53 |
| Year | First date | Last date |
|---|---|---|
| 1958 | 1958-05-17 | 1958-10-05 |
| 1959 | 1959-05-14 | 1959-09-14 |
| 1960 | 1960-05-11 | 1960-10-06 |
| 1961 | 1961-05-21 | 1961-09-05 |
| 1962 | 1962-06-09 | 1962-09-27 |
| 1963 | 1963-05-21 | 1963-09-30 |
| 1964 | 1964-06-01 | 1964-09-25 |
| 1965 | 1965-05-13 | 1965-09-26 |
| 1966 | 1966-05-03 | 1966-09-23 |
| 1967 | 1967-05-17 | 1967-09-29 |
| 1968 | 1968-04-30 | 1968-09-12 |
| 1969 | 1969-05-11 | 1969-09-13 |
| 1970 | 1970-05-16 | 1970-09-02 |
| 1971 | 1971-05-12 | 1971-09-11 |
| 1972 | 1972-05-14 | 1972-09-17 |
| 1973 | 1973-05-14 | 1973-09-13 |
| 1974 | 1974-06-11 | 1974-09-26 |
| 1975 | 1975-06-01 | 1975-09-16 |
| 1976 | 1976-05-14 | 1976-10-01 |
| 1977 | 1977-04-08 | 1977-09-14 |
| 1978 | 1978-06-03 | 1978-09-27 |
| 1981 | 1981-05-01 | 1981-09-19 |
| 1982 | 1982-06-11 | 1982-09-09 |
| 1983 | 1983-05-22 | 1983-09-01 |
| 1984 | 1984-06-16 | 1984-09-19 |
| 1986 | 1986-05-26 | 1986-10-08 |
| 1987 | 1987-04-28 | 1987-09-24 |
| 1988 | 1988-05-10 | 1988-10-02 |
| 1989 | 1989-06-02 | 1989-09-25 |
| 1990 | 1990-06-20 | 1990-09-27 |
| 1991 | 1991-06-03 | 1991-10-02 |
| 1992 | 1992-05-06 | 1992-09-23 |
| 1994 | 1994-06-12 | 1994-09-29 |
| 1995 | 1995-05-30 | 1995-09-16 |
| 1996 | 1996-06-02 | 1996-09-29 |
| 1997 | 1997-05-13 | 1997-09-26 |
| 1998 | 1998-05-01 | 1998-09-17 |
| 1999 | 1999-05-24 | 1999-09-24 |
| 2000 | 2000-05-22 | 2000-09-19 |
| 2001 | 2001-05-13 | 2001-09-25 |
| 2002 | 2002-06-13 | 2002-09-16 |
| 2003 | 2003-05-24 | 2003-09-28 |
| 2004 | 2004-06-05 | 2004-09-09 |
| 2005 | 2005-05-28 | 2005-09-09 |
| 2006 | 2006-05-16 | 2006-09-13 |
| 2007 | 2007-05-09 | 2007-09-14 |
| 2008 | 2008-05-17 | 2008-09-19 |
| 2009 | 2009-05-18 | 2009-09-25 |
| 2010 | 2010-06-14 | 2010-09-29 |
| 2011 | 2011-06-23 | 2011-09-25 |
| 2016 | 2016-04-21 | 2016-09-17 |
| 2017 | 2017-05-05 | 2017-09-14 |
| 2018 | 2018-05-15 | 2018-09-08 |
| 2019 | 2019-05-13 | 2019-09-14 |
| 2020 | 2020-05-29 | 2020-10-07 |
| 2021 | 2021-06-01 | 2021-09-26 |
| 2022 | 2022-06-23 | 2022-09-08 |
| 2026 | 2026-05-24 | 2026-06-25 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 58 | 92 | 1958 | 13 |
| 35 C (95 F): Days | 57 | 58 | 1958 | 37 |
| 40 C (104 F): Days | 24 | 13 | 1960 | 5 |
| 45 C (113 F): Days | 1 | 1 | 1961 | 1 |
| 90 F (32.2 C): Days | 58 | 75 | 1958 | 5 |
| 100 F (37.8 C): Days | 51 | 30 | 1961 | 13 |
| 110 F (43.3 C): Days | 4 | 2 | 1960 | 1 |
| 0 C (32 F): Ice days (max | 56 | 33 | 1960 | 5 |
| 0 C (32 F): Frost days (min | 56 | 119 | 2019 | 46 |
| -10 C (14 F): Days with min | 49 | 21 | 1972 | 3 |
| -20 C (-4 F): Days with min | 12 | 5 | 1972 | 1 |
| 20 C (68 F): Tropical nights (min | 48 | 20 | 2021 | 11 |
| 25 C (77 F): Days with min | 4 | 2 | 1960 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 55 | 10 | 1994 | 5 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 12 | 1 | 1975 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 9 | 3 | 1969 | 1 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 1 | 1 | 1969 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1958.
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).