MUD MOUNTAIN DAM, WASHINGTON

NCDC 1961-1990 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Mean Max. Temperature (F) 43.9 47.4 49.9 53.9 60.1 66.1 71.6 72.4 67.2 58.9 49.3 44.1 57.1
Highest Mean Max. Temperature (F) 52.1 54.5 55.9 59.9 64.5 71.6 81.1 81.6 74.3 67.3 53.7 48.9 60.3
Year Highest Occurred 1961 1963 1986 1989 1969 1986 1985 1967 1974 1987 1976 1979 1987
Lowest Mean Max. Temperature (F) 35.8 39.6 44.8 48.8 53.2 58.7 66.2 65.6 62.5 54.7 39.0 37.4 54.3
Year Lowest Occurred 1969 1989 1971 1970 1962 1971 1963 1976 1978 1971 1985 1983 1964
Mean Temperature (F) 37.5 40.0 42.0 45.4 51.0 56.7 61.1 61.7 57.1 49.7 42.3 37.8 48.5
Highest Mean Temperature (F) 44.8 46.2 45.9 49.9 54.5 60.7 66.6 67.6 62.0 54.1 46.3 42.8 50.6
Year Highest Occurred 1981 1963 1986 1989 1983 1978 1985 1967 1974 1987 1965 1979 1987
Lowest Mean Temperature (F) 30.0 32.3 37.5 40.5 46.7 51.7 57.3 57.7 53.6 45.2 32.2 31.5 46.5
Year Lowest Occurred 1969 1989 1971 1975 1962 1971 1963 1973 1972 1984 1985 1983 1964
Mean Min. Temperature (F) 31.0 32.6 34.0 36.8 41.9 47.4 50.5 51.0 46.8 40.5 35.2 31.4 39.9
Highest Mean Min. Temperature (F) 38.6 37.9 37.4 40.7 45.6 51.7 53.2 54.4 50.7 44.1 40.5 36.6 40.8
Year Highest Occurred 1981 1963 1978 1990 1983 1969 1990 1977 1963 1965 1965 1979 1987
Lowest Mean Min. Temperature (F) 24.1 25.0 30.1 31.1 39.0 44.0 47.8 46.8 43.1 34.9 25.3 24.8 37.7
Year Lowest Occurred 1969 1989 1971 1975 1964 1984 1986 1973 1984 1984 1985 1990 1985
Mean Precipitation (in.) 7.13 5.16 5.05 4.91 4.28 3.73 1.89 2.48 3.36 4.57 7.55 6.93 57.04
Highest Precipitation (in.) 12.87 11.57 9.58 7.64 7.89 6.62 7.09 8.59 8.39 9.26 14.54 12.51 74.93
Year Highest Occurred 1990 1961 1988 1988 1984 1981 1983 1968 1978 1975 1990 1975 1975
Lowest Precipitation (in.) 1.12 2.29 0.97 2.58 1.32 0.70 0.03 0.02 0.46 0.41 2.41 1.07 44.69
Year Lowest Occurred 1985 1969 1965 1983 1982 1965 1984 1967 1990 1987 1979 1985 1985
Heating Degree Days (F) 853. 700. 713. 588. 434. 257. 142. 144. 246. 474. 681. 843. 6075.
Cooling Degree Days (F) 0. 0. 0. 0. 0. 8. 21. 42. 9. 0. 0. 0. 80.

Western Regional Climate Center, wrcc@dri.edu