Ice Harbor Dam Weather Records (USC00453883)
Record envelope, standing records and threshold days for Ice Harbor Dam (USC00453883), Washington, United States, with 70 years of record.
Key Facts for Ice Harbor Dam
- Ice Harbor Dam (USC00453883) is a weather station in Washington, United States at 46.24 latitude and -118.88 longitude, 112 m (368 ft) above sea level.
- The station reports from 1957 to 2026, 70 years of record.
- 1,464 records set at Ice Harbor Dam still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Ice Harbor Dam tied a daily record precipitation of 17.8 mm (0.7 in) on 9 June 2026.
About the Station
- Location: Washington, United States, 46.24 latitude, -118.88 longitude.
- Elevation: 112 m (368 ft).
- Period of record: 1957 to 2026, 70 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
2 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 19.4 C (66.9 F) | -22.2 C (-8.0 F) | 16.1 C (61.0 F) | -12.2 C (10.0 F) |
| Feb | 23.3 C (73.9 F) | -25.6 C (-14.1 F) | 16.7 C (62.1 F) | -6.7 C (19.9 F) |
| Mar | 27.2 C (81.0 F) | -15.6 C (3.9 F) | 22.2 C (72.0 F) | -3.3 C (26.1 F) |
| Apr | 34.4 C (93.9 F) | -5.6 C (21.9 F) | 25.0 C (77.0 F) | -1.1 C (30.0 F) |
| May | 37.8 C (100.0 F) | -2.2 C (28.0 F) | 30.6 C (87.1 F) | 5.6 C (42.1 F) |
| Jun | 43.3 C (109.9 F) | 3.3 C (37.9 F) | 34.4 C (93.9 F) | 7.2 C (45.0 F) |
| Jul | 44.4 C (111.9 F) | 6.7 C (44.1 F) | n/a | n/a |
| Aug | 47.8 C (118.0 F) | 3.3 C (37.9 F) | n/a | n/a |
| Sep | 37.8 C (100.0 F) | -2.8 C (27.0 F) | n/a | n/a |
| Oct | 32.2 C (90.0 F) | -8.9 C (16.0 F) | n/a | n/a |
| Nov | 25.6 C (78.1 F) | -14.4 C (6.1 F) | n/a | n/a |
| Dec | 20.0 C (68.0 F) | -25.6 C (-14.1 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1957 | 28 |
| 1958 | 43 |
| 1959 | 43 |
| 1960 | 51 |
| 1961 | 46 |
| 1962 | 24 |
| 1963 | 26 |
| 1964 | 27 |
| 1965 | 35 |
| 1966 | 30 |
| 1967 | 38 |
| 1968 | 26 |
| 1969 | 37 |
| 1970 | 20 |
| 1971 | 28 |
| 1972 | 46 |
| 1973 | 15 |
| 1974 | 20 |
| 1975 | 20 |
| 1976 | 17 |
| 1977 | 24 |
| 1978 | 19 |
| 1979 | 7 |
| 1980 | 15 |
| 1981 | 21 |
| 1982 | 19 |
| 1983 | 28 |
| 1984 | 18 |
| 1985 | 24 |
| 1986 | 18 |
| 1987 | 31 |
| 1988 | 22 |
| 1989 | 22 |
| 1990 | 25 |
| 1991 | 13 |
| 1992 | 24 |
| 1993 | 27 |
| 1994 | 17 |
| 1995 | 14 |
| 1996 | 24 |
| 1997 | 8 |
| 1998 | 17 |
| 1999 | 16 |
| 2000 | 9 |
| 2001 | 15 |
| 2002 | 34 |
| 2003 | 18 |
| 2004 | 10 |
| 2005 | 10 |
| 2006 | 25 |
| 2007 | 11 |
| 2008 | 9 |
| 2009 | 13 |
| 2010 | 18 |
| 2011 | 11 |
| 2012 | 10 |
| 2013 | 11 |
| 2014 | 19 |
| 2015 | 10 |
| 2016 | 12 |
| 2017 | 13 |
| 2018 | 7 |
| 2019 | 34 |
| 2020 | 20 |
| 2021 | 18 |
| 2022 | 23 |
| 2023 | 7 |
| 2025 | 18 |
| 2026 | 6 |
Wettest Day of Each Month
Jun: 63.5 mm (2.5 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 19.6 mm (0.8 in) | 26 January 1975 |
| Feb | 21.8 mm (0.9 in) | 24 February 2026 |
| Mar | 25.7 mm (1.0 in) | 12 March 1986 |
| Apr | 22.9 mm (0.9 in) | 6 April 1969 |
| May | 37.1 mm (1.5 in) | 27 May 2008 |
| Jun | 63.5 mm (2.5 in) | 6 June 1957 |
| Jul | 23.4 mm (0.9 in) | 23 July 1992 |
| Aug | 34.5 mm (1.4 in) | 17 August 1993 |
| Sep | 18.3 mm (0.7 in) | 2 September 1971 |
| Oct | 34.5 mm (1.4 in) | 29 October 1982 |
| Nov | 39.6 mm (1.6 in) | 19 November 1996 |
| Dec | 26.4 mm (1.0 in) | 29 December 2010 |
Period of Record Coverage
1957 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1957 | 280 | 77% | No |
| 1958 | 364 | 100% | Yes |
| 1959 | 365 | 100% | Yes |
| 1960 | 366 | 100% | Yes |
| 1961 | 362 | 99% | Yes |
| 1962 | 363 | 99% | Yes |
| 1963 | 365 | 100% | Yes |
| 1964 | 366 | 100% | Yes |
| 1965 | 365 | 100% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 365 | 100% | Yes |
| 1968 | 365 | 100% | Yes |
| 1969 | 365 | 100% | Yes |
| 1970 | 365 | 100% | Yes |
| 1971 | 365 | 100% | Yes |
| 1972 | 334 | 91% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 365 | 100% | Yes |
| 1975 | 364 | 100% | Yes |
| 1976 | 366 | 100% | Yes |
| 1977 | 365 | 100% | Yes |
| 1978 | 363 | 99% | Yes |
| 1979 | 297 | 81% | No |
| 1980 | 306 | 84% | No |
| 1981 | 363 | 99% | Yes |
| 1982 | 363 | 99% | Yes |
| 1983 | 360 | 99% | Yes |
| 1984 | 333 | 91% | Yes |
| 1985 | 302 | 83% | No |
| 1986 | 333 | 91% | Yes |
| 1987 | 365 | 100% | Yes |
| 1988 | 366 | 100% | Yes |
| 1989 | 360 | 99% | Yes |
| 1990 | 351 | 96% | Yes |
| 1991 | 335 | 92% | Yes |
| 1992 | 334 | 91% | Yes |
| 1993 | 323 | 88% | No |
| 1994 | 334 | 92% | Yes |
| 1995 | 361 | 99% | Yes |
| 1996 | 365 | 100% | Yes |
| 1997 | 364 | 100% | Yes |
| 1998 | 364 | 100% | Yes |
| 1999 | 365 | 100% | Yes |
| 2000 | 365 | 100% | Yes |
| 2001 | 358 | 98% | Yes |
| 2002 | 362 | 99% | Yes |
| 2003 | 364 | 100% | Yes |
| 2004 | 364 | 99% | Yes |
| 2005 | 330 | 90% | Yes |
| 2006 | 355 | 97% | Yes |
| 2007 | 364 | 100% | Yes |
| 2008 | 365 | 100% | Yes |
| 2009 | 364 | 100% | Yes |
| 2010 | 360 | 99% | Yes |
| 2011 | 365 | 100% | Yes |
| 2012 | 275 | 75% | No |
| 2013 | 185 | 51% | No |
| 2014 | 303 | 83% | No |
| 2015 | 244 | 67% | No |
| 2016 | 360 | 98% | Yes |
| 2017 | 333 | 91% | Yes |
| 2018 | 355 | 97% | Yes |
| 2019 | 361 | 99% | Yes |
| 2020 | 366 | 100% | Yes |
| 2021 | 365 | 100% | Yes |
| 2022 | 332 | 91% | Yes |
| 2023 | 121 | 33% | No |
| 2025 | 181 | 50% | No |
| 2026 | 181 | 50% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 9 June 2026 | Ice Harbor Dam, US | daily rain (Tie) | 17.8 mm (0.7 in) | tie | 53 years | 5 of 100 (Routine) |
| 23 April 2026 | Ice Harbor Dam, US | daily rain (Tie) | 10.4 mm (0.4 in) | tie | 28 years | 3 of 100 (Routine) |
| 22 April 2026 | Ice Harbor Dam, US | daily rain | 14.2 mm (0.6 in) | 7.1 mm (0.28 in) | 37 years | 20 of 100 (Routine) |
| 2 April 2026 | Ice Harbor Dam, US | daily rain | 19.8 mm (0.8 in) | 9.6 mm (0.38 in) | 16 years | 20 of 100 (Routine) |
| 31 March 2026 | Ice Harbor Dam, US | daily low min | -2.2 C (28.0 F) | 0.5 C (0.9 F) | 51 years | 23 of 100 (Routine) |
| 21 March 2026 | Ice Harbor Dam, US | daily high min (Tie) | 8.3 C (46.9 F) | tie | 37 years | 4 of 100 (Routine) |
| 20 March 2026 | Ice Harbor Dam, US | daily high min | 11.1 C (52.0 F) | 0.5 C (0.9 F) | 28 years | 16 of 100 (Routine) |
| 20 March 2026 | Ice Harbor Dam, US | daily high max (Tie) | 22.2 C (72.0 F) | tie | 36 years | 4 of 100 (Routine) |
| 19 March 2026 | Ice Harbor Dam, US | daily high min | 11.1 C (52.0 F) | 1.7 C (3.1 F) | 28 years | 19 of 100 (Routine) |
| 14 March 2026 | Ice Harbor Dam, US | daily low max | 6.7 C (44.1 F) | 2.2 C (4.0 F) | 7 years | 14 of 100 (Routine) |
| 8 March 2026 | Ice Harbor Dam, US | daily high min | 9.4 C (48.9 F) | 2.7 C (4.9 F) | 43 years | 26 of 100 (Routine) |
| 24 February 2026 | Ice Harbor Dam, US | monthly rain | 21.8 mm (0.9 in) | 5.3 mm (0.21 in) | 56 years | 20 of 100 (Routine) |
| 9 February 2026 | Ice Harbor Dam, US | daily rain (Tie) | 7.6 mm (0.30 in) | tie | 51 years | 5 of 100 (Routine) |
| 13 January 2026 | Ice Harbor Dam, US | daily high min | 7.8 C (46.0 F) | 1.1 C (2.0 F) | 12 years | 12 of 100 (Routine) |
| 13 June 2025 | Ice Harbor Dam, US | daily high max | 37.2 C (99.0 F) | 2.8 C (5.0 F) | 6 years | 12 of 100 (Routine) |
| 11 June 2025 | Ice Harbor Dam, US | daily high max (Tie) | 35.0 C (95.0 F) | tie | 10 years | 2 of 100 (Routine) |
| 10 June 2025 | Ice Harbor Dam, US | daily high max | 36.7 C (98.1 F) | 3.4 C (6.1 F) | 56 years | 29 of 100 (Routine) |
| 18 May 2025 | Ice Harbor Dam, US | daily rain | 14.0 mm (0.6 in) | 5.9 mm (0.23 in) | 34 years | 20 of 100 (Routine) |
| 30 April 2025 | Ice Harbor Dam, US | daily low min | -5.0 C (23.0 F) | 5.6 C (10.1 F) | 6 years | 24 of 100 (Routine) |
| 29 April 2025 | Ice Harbor Dam, US | daily low min | -0.6 C (30.9 F) | 1.2 C (2.2 F) | 52 years | 24 of 100 (Routine) |
Climate Trend
47 complete years, 1958 to 2021| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1958 | 13.7 C | +1.45 C |
| 1959 | 11.6 C | -0.60 C |
| 1960 | 11.9 C | -0.27 C |
| 1961 | 12.9 C | +0.69 C |
| 1962 | 12.2 C | 0.00 C |
| 1963 | 12.3 C | +0.05 C |
| 1964 | 11.7 C | -0.51 C |
| 1965 | 12.6 C | +0.40 C |
| 1966 | 13.1 C | +0.90 C |
| 1967 | 13.7 C | +1.45 C |
| 1968 | 12.7 C | +0.45 C |
| 1969 | 11.5 C | -0.72 C |
| 1970 | 12.0 C | -0.23 C |
| 1971 | 12.1 C | -0.08 C |
| 1973 | 12.2 C | +0.02 C |
| 1974 | 12.3 C | +0.13 C |
| 1975 | 11.6 C | -0.65 C |
| 1976 | 11.5 C | -0.69 C |
| 1977 | 11.7 C | -0.51 C |
| 1978 | 10.9 C | -1.29 C |
| 1981 | 12.1 C | -0.08 C |
| 1982 | 11.4 C | -0.81 C |
| 1983 | 12.1 C | -0.16 C |
| 1987 | 12.8 C | +0.54 C |
| 1988 | 12.4 C | +0.19 C |
| 1989 | 11.8 C | -0.44 C |
| 1995 | 12.1 C | -0.07 C |
| 1996 | 11.3 C | -0.93 C |
| 1997 | 12.3 C | +0.08 C |
| 1998 | 13.2 C | +0.96 C |
| 1999 | 12.4 C | +0.17 C |
| 2000 | 11.7 C | -0.50 C |
| 2001 | 12.3 C | +0.05 C |
| 2002 | 12.1 C | -0.16 C |
| 2003 | 13.2 C | +0.98 C |
| 2004 | 12.7 C | +0.45 C |
| 2006 | 12.5 C | +0.31 C |
| 2007 | 12.2 C | 0.00 C |
| 2008 | 11.4 C | -0.79 C |
| 2009 | 11.7 C | -0.56 C |
| 2010 | 12.1 C | -0.14 C |
| 2011 | 11.5 C | -0.75 C |
| 2016 | 12.9 C | +0.73 C |
| 2018 | 12.7 C | +0.47 C |
| 2019 | 11.2 C | -0.97 C |
| 2020 | 12.8 C | +0.58 C |
| 2021 | 13.3 C | +1.09 C |
The fitted trend in annual mean temperature here over 1958 to 2021 is 0.00 C (-0.10 to 0.10) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.00 F (-0.18 to 0.18) per decade. The slope is a straight line fitted to 47 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.00 C (-0.10 to 0.10) per decade | 0.00 F (-0.18 to 0.18) per decade | 1958 to 2021 | 47 | Not clearly different from zero |
| Mean daily maximum | -0.1 C (-0.2 to 0.1) per decade | -0.1 F (-0.3 to 0.1) per decade | 1958 to 2021 | 47 | Not clearly different from zero |
| Mean daily minimum | 0.06 C (-0.04 to 0.16) per decade | 0.1 F (-0.1 to 0.3) per decade | 1958 to 2021 | 47 | Not clearly different from zero |
A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.
Extremes by Year
1957 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 47.8 C (118.0 F) | 1961 | 38.9 C (102.0 F) | 69 |
| Coldest night (TNn) | -25.6 C (-14.1 F) | 1968 | -13.9 C (7.0 F) | 69 |
| Wettest day (Rx1day) | 63.5 mm (2.5 in) | 1957 | 18.8 mm (0.7 in) | 69 |
| Wettest five days (Rx5day) | 63.8 mm (2.5 in) | 1957 | 32.2 mm (1.3 in) | 69 |
| Longest dry spell (CDD) | 117 days | 2003 | 55 days | 69 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1957 | 39.4 C (102.9 F) |
| 1958 | 42.8 C (109.0 F) |
| 1959 | 43.3 C (109.9 F) |
| 1960 | 44.4 C (111.9 F) |
| 1961 | 47.8 C (118.0 F) |
| 1962 | 39.4 C (102.9 F) |
| 1963 | 38.9 C (102.0 F) |
| 1964 | 40.6 C (105.1 F) |
| 1965 | 40.6 C (105.1 F) |
| 1966 | 37.8 C (100.0 F) |
| 1967 | 40.6 C (105.1 F) |
| 1968 | 42.2 C (108.0 F) |
| 1969 | 37.8 C (100.0 F) |
| 1970 | 38.9 C (102.0 F) |
| 1971 | 40.6 C (105.1 F) |
| 1972 | 37.2 C (99.0 F) |
| 1973 | 39.4 C (102.9 F) |
| 1974 | 38.9 C (102.0 F) |
| 1975 | 41.1 C (106.0 F) |
| 1976 | 36.7 C (98.1 F) |
| 1977 | 40.6 C (105.1 F) |
| 1978 | 39.4 C (102.9 F) |
| 1979 | 35.6 C (96.1 F) |
| 1980 | 37.8 C (100.0 F) |
| 1981 | 40.0 C (104.0 F) |
| 1982 | 40.0 C (104.0 F) |
| 1983 | 37.2 C (99.0 F) |
| 1984 | 38.9 C (102.0 F) |
| 1985 | 38.9 C (102.0 F) |
| 1986 | 37.2 C (99.0 F) |
| 1987 | 38.9 C (102.0 F) |
| 1988 | 37.8 C (100.0 F) |
| 1989 | 37.8 C (100.0 F) |
| 1990 | 41.1 C (106.0 F) |
| 1991 | 38.3 C (100.9 F) |
| 1992 | 40.6 C (105.1 F) |
| 1993 | 36.1 C (97.0 F) |
| 1994 | 40.6 C (105.1 F) |
| 1995 | 37.8 C (100.0 F) |
| 1996 | 37.8 C (100.0 F) |
| 1997 | 37.8 C (100.0 F) |
| 1998 | 41.7 C (107.1 F) |
| 1999 | 37.8 C (100.0 F) |
| 2000 | 37.8 C (100.0 F) |
| 2001 | 37.8 C (100.0 F) |
| 2002 | 40.6 C (105.1 F) |
| 2003 | 41.1 C (106.0 F) |
| 2004 | 37.8 C (100.0 F) |
| 2005 | 38.3 C (100.9 F) |
| 2006 | 41.1 C (106.0 F) |
| 2007 | 38.3 C (100.9 F) |
| 2008 | 37.8 C (100.0 F) |
| 2009 | 40.0 C (104.0 F) |
| 2010 | 37.8 C (100.0 F) |
| 2011 | 35.0 C (95.0 F) |
| 2012 | 40.0 C (104.0 F) |
| 2013 | 35.0 C (95.0 F) |
| 2014 | 39.4 C (102.9 F) |
| 2015 | 40.0 C (104.0 F) |
| 2016 | 38.3 C (100.9 F) |
| 2017 | 38.9 C (102.0 F) |
| 2018 | 38.9 C (102.0 F) |
| 2019 | 36.7 C (98.1 F) |
| 2020 | 40.6 C (105.1 F) |
| 2021 | 42.8 C (109.0 F) |
| 2022 | 43.3 C (109.9 F) |
| 2023 | 40.0 C (104.0 F) |
| 2025 | 37.2 C (99.0 F) |
| 2026 | 34.4 C (93.9 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1957 | -7.8 C (18.0 F) |
| 1958 | -12.8 C (9.0 F) |
| 1959 | -16.1 C (3.0 F) |
| 1960 | -14.4 C (6.1 F) |
| 1961 | -14.4 C (6.1 F) |
| 1962 | -16.1 C (3.0 F) |
| 1963 | -17.2 C (1.0 F) |
| 1964 | -20.6 C (-5.1 F) |
| 1965 | -10.6 C (12.9 F) |
| 1966 | -7.2 C (19.0 F) |
| 1967 | -13.3 C (8.1 F) |
| 1968 | -25.6 C (-14.1 F) |
| 1969 | -21.7 C (-7.1 F) |
| 1970 | -10.6 C (12.9 F) |
| 1971 | -12.2 C (10.0 F) |
| 1972 | -20.6 C (-5.1 F) |
| 1973 | -18.3 C (-0.9 F) |
| 1974 | -20.6 C (-5.1 F) |
| 1975 | -8.3 C (17.1 F) |
| 1976 | -10.6 C (12.9 F) |
| 1977 | -13.3 C (8.1 F) |
| 1978 | -21.7 C (-7.1 F) |
| 1979 | -21.7 C (-7.1 F) |
| 1980 | -11.7 C (10.9 F) |
| 1981 | -10.0 C (14.0 F) |
| 1982 | -17.2 C (1.0 F) |
| 1983 | -23.3 C (-9.9 F) |
| 1984 | -18.9 C (-2.0 F) |
| 1985 | -20.6 C (-5.1 F) |
| 1986 | -7.8 C (18.0 F) |
| 1987 | -12.8 C (9.0 F) |
| 1988 | -11.7 C (10.9 F) |
| 1989 | -21.7 C (-7.1 F) |
| 1990 | -23.3 C (-9.9 F) |
| 1991 | -11.7 C (10.9 F) |
| 1992 | -8.3 C (17.1 F) |
| 1993 | -18.3 C (-0.9 F) |
| 1994 | -15.6 C (3.9 F) |
| 1995 | -11.7 C (10.9 F) |
| 1996 | -25.6 C (-14.1 F) |
| 1997 | -12.8 C (9.0 F) |
| 1998 | -17.2 C (1.0 F) |
| 1999 | -5.6 C (21.9 F) |
| 2000 | -9.4 C (15.1 F) |
| 2001 | -7.2 C (19.0 F) |
| 2002 | -10.0 C (14.0 F) |
| 2003 | -10.6 C (12.9 F) |
| 2004 | -21.1 C (-6.0 F) |
| 2005 | -12.8 C (9.0 F) |
| 2006 | -14.4 C (6.1 F) |
| 2007 | -13.3 C (8.1 F) |
| 2008 | -18.3 C (-0.9 F) |
| 2009 | -18.3 C (-0.9 F) |
| 2010 | -14.4 C (6.1 F) |
| 2011 | -13.9 C (7.0 F) |
| 2012 | -11.7 C (10.9 F) |
| 2013 | -15.0 C (5.0 F) |
| 2014 | -13.3 C (8.1 F) |
| 2015 | -10.0 C (14.0 F) |
| 2016 | -17.2 C (1.0 F) |
| 2017 | -20.6 C (-5.1 F) |
| 2018 | -8.3 C (17.1 F) |
| 2019 | -16.1 C (3.0 F) |
| 2020 | -13.3 C (8.1 F) |
| 2021 | -11.7 C (10.9 F) |
| 2022 | -14.4 C (6.1 F) |
| 2023 | 1.1 C (34.0 F) |
| 2025 | -17.2 C (1.0 F) |
| 2026 | -12.2 C (10.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1957 | 63.5 mm (2.5 in) |
| 1958 | 19.8 mm (0.8 in) |
| 1959 | 16.0 mm (0.6 in) |
| 1960 | 17.0 mm (0.7 in) |
| 1961 | 15.7 mm (0.6 in) |
| 1962 | 14.0 mm (0.6 in) |
| 1963 | 22.9 mm (0.9 in) |
| 1964 | 16.0 mm (0.6 in) |
| 1965 | 14.5 mm (0.6 in) |
| 1966 | 18.3 mm (0.7 in) |
| 1967 | 9.9 mm (0.39 in) |
| 1968 | 18.0 mm (0.7 in) |
| 1969 | 22.9 mm (0.9 in) |
| 1970 | 16.5 mm (0.6 in) |
| 1971 | 18.8 mm (0.7 in) |
| 1972 | 20.3 mm (0.8 in) |
| 1973 | 18.3 mm (0.7 in) |
| 1974 | 8.6 mm (0.34 in) |
| 1975 | 25.4 mm (1.0 in) |
| 1976 | 9.7 mm (0.38 in) |
| 1977 | 22.1 mm (0.9 in) |
| 1978 | 17.3 mm (0.7 in) |
| 1979 | 25.4 mm (1.0 in) |
| 1980 | 25.4 mm (1.0 in) |
| 1981 | 22.1 mm (0.9 in) |
| 1982 | 34.5 mm (1.4 in) |
| 1983 | 14.0 mm (0.6 in) |
| 1984 | 15.7 mm (0.6 in) |
| 1985 | 6.6 mm (0.26 in) |
| 1986 | 25.7 mm (1.0 in) |
| 1987 | 7.6 mm (0.30 in) |
| 1988 | 25.9 mm (1.0 in) |
| 1989 | 19.8 mm (0.8 in) |
| 1990 | 14.2 mm (0.6 in) |
| 1991 | 25.7 mm (1.0 in) |
| 1992 | 23.4 mm (0.9 in) |
| 1993 | 34.5 mm (1.4 in) |
| 1994 | 24.6 mm (1.0 in) |
| 1995 | 23.6 mm (0.9 in) |
| 1996 | 39.6 mm (1.6 in) |
| 1997 | 14.5 mm (0.6 in) |
| 1998 | 20.8 mm (0.8 in) |
| 1999 | 15.2 mm (0.6 in) |
| 2000 | 27.2 mm (1.1 in) |
| 2001 | 23.4 mm (0.9 in) |
| 2002 | 16.5 mm (0.6 in) |
| 2003 | 24.4 mm (1.0 in) |
| 2004 | 14.7 mm (0.6 in) |
| 2005 | 29.2 mm (1.1 in) |
| 2006 | 35.3 mm (1.4 in) |
| 2007 | 16.8 mm (0.7 in) |
| 2008 | 37.1 mm (1.5 in) |
| 2009 | 19.6 mm (0.8 in) |
| 2010 | 26.4 mm (1.0 in) |
| 2011 | 22.9 mm (0.9 in) |
| 2012 | 15.7 mm (0.6 in) |
| 2013 | 8.9 mm (0.35 in) |
| 2014 | 10.2 mm (0.4 in) |
| 2015 | 15.5 mm (0.6 in) |
| 2016 | 20.8 mm (0.8 in) |
| 2017 | 17.5 mm (0.7 in) |
| 2018 | 18.3 mm (0.7 in) |
| 2019 | 17.0 mm (0.7 in) |
| 2020 | 18.8 mm (0.7 in) |
| 2021 | 18.8 mm (0.7 in) |
| 2022 | 20.3 mm (0.8 in) |
| 2023 | 10.7 mm (0.4 in) |
| 2025 | 15.5 mm (0.6 in) |
| 2026 | 21.8 mm (0.9 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1957 | 63.8 mm (2.5 in) |
| 1958 | 35.6 mm (1.4 in) |
| 1959 | 29.4 mm (1.2 in) |
| 1960 | 31.5 mm (1.2 in) |
| 1961 | 23.1 mm (0.9 in) |
| 1962 | 37.1 mm (1.5 in) |
| 1963 | 35.6 mm (1.4 in) |
| 1964 | 51.7 mm (2.0 in) |
| 1965 | 20.1 mm (0.8 in) |
| 1966 | 38.2 mm (1.5 in) |
| 1967 | 20.3 mm (0.8 in) |
| 1968 | 27.4 mm (1.1 in) |
| 1969 | 28.3 mm (1.1 in) |
| 1970 | 34.7 mm (1.4 in) |
| 1971 | 32.5 mm (1.3 in) |
| 1972 | 23.9 mm (0.9 in) |
| 1973 | 30.2 mm (1.2 in) |
| 1974 | 19.1 mm (0.8 in) |
| 1975 | 38.4 mm (1.5 in) |
| 1976 | 17.5 mm (0.7 in) |
| 1977 | 39.9 mm (1.6 in) |
| 1978 | 34.1 mm (1.3 in) |
| 1979 | 34.6 mm (1.4 in) |
| 1980 | 37.8 mm (1.5 in) |
| 1981 | 25.1 mm (1.0 in) |
| 1982 | 40.3 mm (1.6 in) |
| 1983 | 24.9 mm (1.0 in) |
| 1984 | 22.1 mm (0.9 in) |
| 1985 | 10.5 mm (0.4 in) |
| 1986 | 36.1 mm (1.4 in) |
| 1987 | 18.4 mm (0.7 in) |
| 1988 | 33.8 mm (1.3 in) |
| 1989 | 27.9 mm (1.1 in) |
| 1990 | 24.7 mm (1.0 in) |
| 1991 | 31.5 mm (1.2 in) |
| 1992 | 30.2 mm (1.2 in) |
| 1993 | 62.7 mm (2.5 in) |
| 1994 | 41.9 mm (1.6 in) |
| 1995 | 34.0 mm (1.3 in) |
| 1996 | 59.1 mm (2.3 in) |
| 1997 | 28.5 mm (1.1 in) |
| 1998 | 35.6 mm (1.4 in) |
| 1999 | 23.2 mm (0.9 in) |
| 2000 | 27.5 mm (1.1 in) |
| 2001 | 33.3 mm (1.3 in) |
| 2002 | 32.8 mm (1.3 in) |
| 2003 | 33.7 mm (1.3 in) |
| 2004 | 36.3 mm (1.4 in) |
| 2005 | 43.6 mm (1.7 in) |
| 2006 | 54.2 mm (2.1 in) |
| 2007 | 20.8 mm (0.8 in) |
| 2008 | 43.2 mm (1.7 in) |
| 2009 | 30.2 mm (1.2 in) |
| 2010 | 32.5 mm (1.3 in) |
| 2011 | 29.7 mm (1.2 in) |
| 2012 | 33.0 mm (1.3 in) |
| 2013 | 17.6 mm (0.7 in) |
| 2014 | 18.1 mm (0.7 in) |
| 2015 | 37.7 mm (1.5 in) |
| 2016 | 28.1 mm (1.1 in) |
| 2017 | 32.2 mm (1.3 in) |
| 2018 | 33.5 mm (1.3 in) |
| 2019 | 34.6 mm (1.4 in) |
| 2020 | 28.6 mm (1.1 in) |
| 2021 | 27.7 mm (1.1 in) |
| 2022 | 42.9 mm (1.7 in) |
| 2023 | 16.8 mm (0.7 in) |
| 2025 | 30.0 mm (1.2 in) |
| 2026 | 27.5 mm (1.1 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1957 | 62 days |
| 1958 | 72 days |
| 1959 | 44 days |
| 1960 | 46 days |
| 1961 | 79 days |
| 1962 | 49 days |
| 1963 | 89 days |
| 1964 | 75 days |
| 1965 | 61 days |
| 1966 | 59 days |
| 1967 | 80 days |
| 1968 | 55 days |
| 1969 | 68 days |
| 1970 | 61 days |
| 1971 | 58 days |
| 1972 | 30 days |
| 1973 | 73 days |
| 1974 | 111 days |
| 1975 | 35 days |
| 1976 | 59 days |
| 1977 | 43 days |
| 1978 | 30 days |
| 1979 | 40 days |
| 1980 | 44 days |
| 1981 | 81 days |
| 1982 | 28 days |
| 1983 | 44 days |
| 1984 | 36 days |
| 1985 | 54 days |
| 1986 | 72 days |
| 1987 | 77 days |
| 1988 | 101 days |
| 1989 | 59 days |
| 1990 | 35 days |
| 1991 | 34 days |
| 1992 | 35 days |
| 1993 | 56 days |
| 1994 | 58 days |
| 1995 | 36 days |
| 1996 | 58 days |
| 1997 | 34 days |
| 1998 | 55 days |
| 1999 | 42 days |
| 2000 | 58 days |
| 2001 | 46 days |
| 2002 | 43 days |
| 2003 | 117 days |
| 2004 | 56 days |
| 2005 | 51 days |
| 2006 | 45 days |
| 2007 | 39 days |
| 2008 | 57 days |
| 2009 | 30 days |
| 2010 | 26 days |
| 2011 | 80 days |
| 2012 | 30 days |
| 2013 | 22 days |
| 2014 | 42 days |
| 2015 | 86 days |
| 2016 | 30 days |
| 2017 | 80 days |
| 2018 | 61 days |
| 2019 | 34 days |
| 2020 | 111 days |
| 2021 | 94 days |
| 2022 | 56 days |
| 2023 | 36 days |
| 2025 | 43 days |
| 2026 | 25 days |
Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.
Frost Dates and Growing Season
47 years with a frostAcross 47 years with a frost, the median last spring frost at Ice Harbor Dam falls on 9 April and the median first autumn frost on 18 October, which leaves a median of 196 days between them.
Fitted over all years, the growing season changes by -1.1 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1976 to 2021) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 9 April | n/a | 9 April | n/a | +0.3 days per decade |
| First autumn frost | 18 October | n/a | 15 October | n/a | -0.8 days per decade |
| Growing days | 196 days | n/a | 190 days | n/a | -1.1 days per decade |
A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.
Rainfall Return Levels
58 years, 1958 to 2022A day with at least 19.5 mm (0.8 in) of rain is expected about once in 2 years. A day with at least 41.1 mm (1.6 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 19.5 mm (0.8 in) | |
| 5 years | 25.5 mm (1.0 in) | |
| 10 years | 29.4 mm (1.2 in) | |
| 25 years | 34.2 mm (1.3 in) | |
| 50 years | 37.7 mm (1.5 in) | |
| 100 years | 41.1 mm (1.6 in) | Longer than the 58 years of record |
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 58 years of values from 1958 to 2022.
A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.
The largest wettest-day totals in the fit: 39.6 mm (1.6 in) in 1996; 37.1 mm (1.5 in) in 2008; 35.3 mm (1.4 in) in 2006.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Climate Twins
2001 to 2021 against 1961 to 1990Over 2001 to 2021, Ice Harbor Dam had a mean temperature of 12.3 C (54.1 F) and 255.6 mm (10.1 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Arlington (United States, 118 km away), Dallesport AP (United States, 190 km away) and Canon City (United States, 1,414 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Arlington | United States | 118 km (73 mi) | 12.5 C (54.6 F) | 220.8 mm (8.7 in) | 0.65 |
| Dallesport AP | United States | 190 km (118 mi) | 12.2 C (53.9 F) | 337.8 mm (13.3 in) | 0.65 |
| Canon City | United States | 1,414 km (879 mi) | 12.2 C (54.0 F) | 303.1 mm (11.9 in) | 0.79 |
Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.
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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-12).