PETERSONS RANCH, WASHINGTON

NCDC 1961-1990 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Mean Max. Temperature (F) 41.8 46.4 51.1 56.8 64.7 71.2 77.6 77.7 71.6 61.6 49.2 42.4 59.3
Highest Mean Max. Temperature (F) 48.0 54.0 58.6 63.9 70.8 79.2 87.1 89.8 80.9 72.2 53.8 47.6 63.4
Year Highest Occurred 1986 1963 1986 1987 1969 1961 1985 1967 1967 1987 1987 1989 1987
Lowest Mean Max. Temperature (F) 31.6 39.2 45.0 50.6 57.2 64.0 71.6 68.7 62.6 56.2 39.6 37.1 56.6
Year Lowest Occurred 1979 1979 1977 1975 1977 1981 1963 1975 1978 1984 1985 1978 1982
Mean Temperature (F) 37.1 40.4 43.5 47.8 54.3 60.3 65.0 65.3 60.8 53.0 43.9 37.9 50.8
Highest Mean Temperature (F) 42.1 46.5 48.7 53.3 59.1 65.8 70.4 72.9 66.1 58.9 48.3 41.5 53.8
Year Highest Occurred 1986 1963 1986 1987 1983 1961 1985 1967 1967 1987 1987 1989 1987
Lowest Mean Temperature (F) 27.8 34.0 39.2 42.3 49.4 55.8 60.4 59.7 56.2 49.0 33.5 32.7 49.0
Year Lowest Occurred 1979 1989 1977 1975 1977 1971 1963 1975 1977 1984 1985 1990 1975
Mean Min. Temperature (F) 32.3 34.4 35.9 38.7 43.9 49.3 52.3 52.8 50.0 44.3 38.5 33.3 42.1
Highest Mean Min. Temperature (F) 37.5 38.9 41.9 42.7 48.1 55.3 56.6 56.3 53.9 49.8 43.4 36.7 44.1
Year Highest Occurred 1981 1963 1983 1987 1983 1969 1982 1982 1974 1988 1965 1974 1987
Lowest Mean Min. Temperature (F) 23.9 27.7 32.0 34.0 40.8 46.3 49.1 48.2 45.6 40.3 27.4 27.3 39.2
Year Lowest Occurred 1979 1989 1976 1975 1967 1965 1986 1973 1972 1990 1985 1990 1985
Mean Precipitation (in.) 18.21 14.42 12.39 7.61 4.93 3.62 1.55 2.35 4.38 8.72 17.46 19.11 114.75
Highest Precipitation (in.) 32.08 30.78 19.99 11.80 11.35 10.64 6.79 9.40 10.74 19.20 32.52 31.17 141.84
Year Highest Occurred 1964 1961 1971 1978 1984 1981 1983 1968 1972 1967 1983 1973 1983
Lowest Precipitation (in.) 0.49 5.21 1.41 2.55 1.61 0.43 0.00 0.00 0.03 0.23 4.85 4.91 79.18
Year Lowest Occurred 1985 1973 1965 1977 1982 1965 1984 1967 1975 1987 1976 1985 1985
Heating Degree Days (F) 865. 689. 667. 516. 335. 170. 79. 95. 164. 372. 633. 840. 5425.
Cooling Degree Days (F) 0. 0. 0. 0. 0. 29. 79. 104. 38. 0. 0. 0. 250.

Western Regional Climate Center, wrcc@dri.edu