OLYMPIA WSO AP, WASHINGTON

NCDC 1961-1990 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Mean Max. Temperature (F) 44.4 49.5 53.9 58.8 65.3 70.9 76.5 77.1 71.0 60.5 50.0 44.2 60.2
Highest Mean Max. Temperature (F) 49.7 55.5 59.7 64.0 70.5 76.7 84.4 86.1 79.1 67.7 54.1 49.4 62.5
Year Highest Occurred 1983 1963 1979 1977 1969 1982 1985 1967 1974 1987 1987 1980 1987
Lowest Mean Max. Temperature (F) 36.0 42.2 48.5 54.2 59.7 64.3 71.5 70.7 65.8 56.8 41.1 38.9 57.4
Year Lowest Occurred 1969 1989 1971 1972 1962 1971 1986 1976 1978 1975 1985 1990 1964
Mean Temperature (F) 38.0 41.1 43.8 47.5 53.2 58.7 62.9 63.3 57.9 49.7 42.5 38.2 49.7
Highest Mean Temperature (F) 42.6 46.2 47.5 50.9 56.5 63.7 67.5 68.5 62.4 53.8 46.5 43.7 51.5
Year Highest Occurred 1983 1963 1983 1989 1983 1969 1985 1967 1974 1988 1980 1980 1981
Lowest Mean Temperature (F) 30.9 33.2 40.0 43.8 49.6 54.5 59.7 59.2 54.0 45.7 33.8 32.6 47.6
Year Lowest Occurred 1979 1989 1971 1972 1962 1971 1986 1973 1965 1972 1985 1990 1964
Mean Min. Temperature (F) 31.6 32.7 33.6 36.2 41.0 46.4 49.2 49.5 44.7 38.8 35.0 32.1 39.2
Highest Mean Min. Temperature (F) 35.7 38.3 37.5 39.0 44.2 52.9 52.8 52.8 49.4 45.8 39.4 38.0 40.6
Year Highest Occurred 1978 1961 1968 1990 1983 1969 1978 1965 1963 1988 1965 1980 1983
Lowest Mean Min. Temperature (F) 22.0 24.2 29.2 32.4 37.0 41.9 45.6 45.6 40.3 33.0 26.5 26.2 37.5
Year Lowest Occurred 1979 1989 1965 1975 1964 1976 1977 1973 1971 1972 1985 1990 1972
Mean Precipitation (in.) 8.01 5.77 4.95 3.29 2.09 1.63 0.82 1.29 2.26 4.31 8.05 8.12 50.59
Highest Precipitation (in.) 15.13 13.18 10.01 5.87 5.48 3.74 3.00 5.45 7.59 10.08 15.51 14.32 64.41
Year Highest Occurred 1964 1961 1972 1972 1984 1984 1983 1968 1978 1967 1962 1970 1972
Lowest Precipitation (in.) 0.29 1.71 0.48 1.27 0.25 0.14 0.00 0.00 0.00 0.39 1.37 2.50 35.07
Year Lowest Occurred 1985 1973 1965 1977 1967 1970 1984 1967 1975 1987 1976 1985 1985
Heating Degree Days (F) 837. 669. 657. 525. 366. 201. 96. 102. 222. 474. 675. 831. 5655.
Cooling Degree Days (F) 0. 0. 0. 0. 0. 12. 31. 49. 9. 0. 0. 0. 101.

Western Regional Climate Center, wrcc@dri.edu