MC MILLIN RSVR, WASHINGTON

NCDC 1961-1990 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Mean Max. Temperature (F) 44.2 48.7 52.6 57.2 63.6 69.3 74.6 75.4 69.7 60.1 50.1 44.4 59.2
Highest Mean Max. Temperature (F) 50.3 56.1 57.2 61.9 67.9 74.2 82.4 82.5 76.8 65.1 54.2 49.5 61.2
Year Highest Occurred 1961 1963 1986 1989 1969 1961 1985 1967 1974 1987 1981 1979 1987
Lowest Mean Max. Temperature (F) 37.2 40.9 47.6 53.0 58.4 63.5 70.1 68.5 64.4 56.9 41.0 38.7 57.2
Year Lowest Occurred 1969 1989 1976 1975 1962 1971 1986 1976 1978 1975 1985 1990 1964
Mean Temperature (F) 37.7 40.9 43.7 47.5 53.1 58.5 62.6 63.1 58.2 50.4 43.0 38.1 49.7
Highest Mean Temperature (F) 42.3 46.8 48.0 50.7 55.8 62.8 66.6 67.2 62.6 53.9 46.4 43.4 51.4
Year Highest Occurred 1961 1963 1986 1989 1987 1969 1985 1967 1967 1965 1987 1966 1987
Lowest Mean Temperature (F) 31.4 32.9 40.0 43.5 50.4 54.6 59.8 59.5 55.0 47.7 33.8 32.1 47.6
Year Lowest Occurred 1979 1989 1976 1975 1962 1971 1986 1973 1972 1984 1985 1983 1985
Mean Min. Temperature (F) 31.2 33.1 34.9 37.7 42.4 47.7 50.4 50.8 46.7 40.6 35.9 31.8 40.3
Highest Mean Min. Temperature (F) 35.6 38.4 38.7 41.3 45.5 53.0 53.9 54.0 50.0 46.5 39.9 38.2 41.7
Year Highest Occurred 1990 1961 1986 1990 1987 1969 1990 1977 1963 1988 1987 1966 1990
Lowest Mean Min. Temperature (F) 22.8 24.8 31.2 33.1 39.9 44.7 48.6 47.2 43.5 37.2 26.5 24.6 37.3
Year Lowest Occurred 1979 1989 1985 1982 1964 1962 1962 1973 1985 1983 1985 1983 1985
Mean Precipitation (in.) 5.72 4.37 4.05 3.14 2.38 2.16 1.06 1.50 2.12 3.38 6.00 5.89 41.77
Highest Precipitation (in.) 10.65 9.49 6.95 4.67 4.77 4.77 3.86 5.21 5.56 7.10 10.74 9.18 53.20
Year Highest Occurred 1990 1961 1989 1988 1984 1984 1983 1968 1978 1967 1990 1975 1990
Lowest Precipitation (in.) 0.47 1.49 0.59 1.32 0.81 0.41 0.01 0.00 0.01 0.35 1.50 1.60 27.83
Year Lowest Occurred 1985 1988 1965 1977 1982 1970 1984 1967 1975 1987 1976 1985 1985
Heating Degree Days (F) 846. 675. 660. 525. 369. 202. 96. 100. 211. 453. 660. 834. 5631.
Cooling Degree Days (F) 0. 0. 0. 0. 0. 7. 22. 41. 7. 0. 0. 0. 77.

Western Regional Climate Center, wrcc@dri.edu