DAYTON 1 WSW, WASHINGTON

NCDC 1961-1990 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Mean Max. Temperature (F) 39.9 46.5 53.3 60.4 68.8 77.8 86.8 86.2 76.5 64.6 49.5 40.9 62.6
Highest Mean Max. Temperature (F) 49.1 51.8 58.5 67.8 73.3 85.9 93.8 94.2 84.2 72.3 54.2 47.7 65.0
Year Highest Occurred 1983 1983 1968 1987 1987 1961 1985 1967 1967 1988 1981 1973 1987
Lowest Mean Max. Temperature (F) 23.7 32.9 48.3 54.2 61.3 69.2 80.5 80.2 67.5 59.3 33.9 25.4 58.4
Year Lowest Occurred 1979 1989 1971 1970 1962 1971 1986 1964 1985 1969 1985 1985 1985
Mean Temperature (F) 32.8 38.0 43.5 49.1 56.4 64.1 70.9 70.4 61.7 51.4 41.0 33.6 51.1
Highest Mean Temperature (F) 41.2 44.1 47.7 54.8 60.2 69.6 76.0 75.2 68.1 57.4 44.9 40.2 53.0
Year Highest Occurred 1967 1961 1986 1987 1987 1961 1985 1967 1967 1988 1983 1973 1967
Lowest Mean Temperature (F) 16.4 24.5 39.0 44.5 51.7 57.7 66.5 65.5 55.6 47.6 27.5 19.5 47.2
Year Lowest Occurred 1979 1989 1971 1970 1962 1971 1986 1964 1985 1984 1985 1985 1985
Mean Min. Temperature (F) 25.5 29.5 33.6 37.8 44.0 50.3 54.9 54.5 46.8 38.1 32.5 26.3 39.5
Highest Mean Min. Temperature (F) 34.3 36.8 38.1 41.8 47.0 54.2 58.8 57.5 52.0 42.4 36.9 32.9 41.2
Year Highest Occurred 1967 1961 1986 1990 1987 1969 1975 1977 1967 1988 1983 1966 1967
Lowest Mean Min. Temperature (F) 9.0 16.1 28.9 34.4 41.9 46.1 51.3 50.7 42.9 33.5 21.1 13.5 35.9
Year Lowest Occurred 1979 1989 1965 1975 1964 1971 1962 1964 1971 1971 1985 1985 1985
Mean Precipitation (in.) 2.38 1.71 2.00 1.49 1.35 1.06 0.54 0.66 0.95 1.40 2.43 2.53 18.50
Highest Precipitation (in.) 5.55 3.95 3.72 3.00 3.73 2.94 2.42 2.33 2.28 3.05 5.83 5.78 23.78
Year Highest Occurred 1970 1961 1989 1982 1962 1971 1978 1977 1968 1990 1973 1964 1980
Lowest Precipitation (in.) 0.31 0.36 0.35 0.28 0.32 0.21 0.00 0.00 0.00 0.00 0.51 0.28 13.60
Year Lowest Occurred 1977 1967 1965 1966 1968 1973 1969 1988 1990 1987 1969 1986 1965
Heating Degree Days (F) 998. 756. 667. 477. 270. 113. 13. 31. 161. 422. 720. 973. 5601.
Cooling Degree Days (F) 0. 0. 0. 0. 0. 86. 196. 199. 62. 0. 0. 0. 543.

Western Regional Climate Center, wrcc@dri.edu