SILVERTON, OREGON

NCDC 1961-1990 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Mean Max. Temperature (F) 45.7 50.7 54.9 59.1 65.4 72.1 78.6 79.2 73.8 63.3 52.3 45.8 61.7
Highest Mean Max. Temperature (F) 50.9 57.2 60.2 64.8 69.5 77.2 84.5 87.3 82.9 70.8 55.5 51.0 63.8
Year Highest Occurred 1986 1963 1986 1989 1987 1961 1985 1967 1974 1987 1976 1979 1987
Lowest Mean Max. Temperature (F) 37.7 43.1 50.6 54.6 58.5 66.5 72.6 73.8 68.6 57.2 43.7 39.8 59.8
Year Lowest Occurred 1979 1989 1971 1975 1962 1971 1963 1975 1986 1984 1985 1990 1964
Mean Temperature (F) 39.3 43.0 46.2 49.6 55.2 61.2 66.0 66.6 61.9 53.4 45.3 39.6 52.3
Highest Mean Temperature (F) 44.0 48.7 51.5 55.0 58.9 65.5 70.2 72.0 67.2 57.9 48.0 44.8 54.2
Year Highest Occurred 1967 1963 1986 1989 1987 1986 1985 1967 1974 1987 1987 1966 1987
Lowest Mean Temperature (F) 30.5 36.0 42.4 45.8 51.4 57.0 61.8 63.0 58.1 49.9 37.6 33.4 50.5
Year Lowest Occurred 1979 1989 1971 1967 1962 1971 1963 1975 1970 1971 1985 1985 1985
Mean Min. Temperature (F) 32.8 35.2 37.4 40.1 44.9 50.3 53.4 53.9 49.9 43.4 38.2 33.4 42.7
Highest Mean Min. Temperature (F) 38.4 40.1 42.8 45.1 48.2 54.3 56.7 57.5 54.8 48.7 42.3 39.4 44.8
Year Highest Occurred 1967 1963 1986 1989 1987 1986 1990 1977 1990 1988 1988 1966 1986
Lowest Mean Min. Temperature (F) 23.2 28.8 34.1 36.0 41.8 47.0 50.9 49.4 46.2 39.9 31.5 26.6 40.8
Year Lowest Occurred 1979 1989 1976 1982 1964 1965 1962 1973 1965 1971 1985 1985 1985
Mean Precipitation (in.) 6.54 5.45 5.29 3.47 2.85 1.84 0.83 1.17 2.13 3.55 6.87 7.51 47.50
Highest Precipitation (in.) 12.23 17.43 13.24 6.15 6.27 5.75 4.03 4.65 4.53 7.88 15.93 14.78 79.27
Year Highest Occurred 1970 1961 1961 1962 1962 1984 1983 1968 1971 1990 1973 1964 1961
Lowest Precipitation (in.) 0.66 0.95 0.52 1.16 0.66 0.32 0.00 0.00 0.00 0.20 1.93 1.74 34.14
Year Lowest Occurred 1985 1964 1965 1977 1964 1986 1967 1967 1975 1987 1976 1976 1976
Heating Degree Days (F) 797. 616. 583. 462. 304. 140. 47. 57. 130. 360. 591. 787. 4874.
Cooling Degree Days (F) 0. 0. 0. 0. 0. 26. 78. 107. 37. 0. 0. 0. 248.

Western Regional Climate Center, wrcc@dri.edu