TROUTDALE SUBSTATION, OREGON

NCDC 1961-1990 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Mean Max. Temperature (F) 45.5 50.7 56.6 61.6 68.2 75.0 80.9 81.6 75.6 64.9 53.6 46.2 63.4
Highest Mean Max. Temperature (F) 52.3 56.9 61.8 67.8 72.8 81.0 88.6 90.3 82.7 72.2 57.8 50.8 66.2
Year Highest Occurred 1967 1968 1986 1989 1987 1987 1985 1986 1967 1987 1981 1974 1987
Lowest Mean Max. Temperature (F) 33.6 41.7 51.8 56.6 60.8 68.7 73.9 75.0 70.8 60.2 44.1 37.7 61.2
Year Lowest Occurred 1979 1989 1962 1972 1962 1971 1963 1976 1978 1984 1985 1985 1964
Mean Temperature (F) 39.7 43.6 47.7 51.5 57.1 63.3 67.5 68.1 62.8 54.7 46.9 40.6 53.6
Highest Mean Temperature (F) 46.1 48.6 52.2 55.7 60.5 67.1 72.3 73.4 67.2 58.3 50.3 45.3 55.3
Year Highest Occurred 1967 1968 1986 1989 1987 1986 1985 1986 1974 1988 1965 1973 1967
Lowest Mean Temperature (F) 28.7 34.7 43.5 47.6 53.2 59.2 63.5 64.3 59.5 52.2 37.7 31.8 51.3
Year Lowest Occurred 1979 1989 1971 1972 1964 1971 1989 1964 1985 1984 1985 1985 1985
Mean Min. Temperature (F) 33.9 36.5 38.7 41.3 46.0 51.5 54.2 54.4 50.0 44.5 40.1 34.9 43.8
Highest Mean Min. Temperature (F) 40.6 41.4 43.0 43.9 48.2 56.5 56.2 57.9 53.5 48.2 44.1 40.1 45.1
Year Highest Occurred 1981 1961 1983 1990 1987 1969 1990 1977 1990 1979 1965 1973 1981
Lowest Mean Min. Temperature (F) 23.7 27.7 34.9 37.5 42.5 48.9 47.9 50.0 43.1 40.2 31.2 25.8 40.8
Year Lowest Occurred 1979 1989 1985 1975 1964 1988 1989 1988 1989 1989 1985 1985 1985
Mean Precipitation (in.) 6.47 5.05 4.38 3.42 2.72 1.97 0.75 1.32 2.19 3.38 6.24 7.07 44.96
Highest Precipitation (in.) 13.71 11.07 7.74 5.54 5.68 5.33 3.94 5.87 4.23 7.78 11.65 12.20 61.74
Year Highest Occurred 1970 1961 1961 1963 1977 1984 1983 1968 1986 1990 1973 1968 1968
Lowest Precipitation (in.) 0.16 1.87 1.45 1.40 0.69 0.46 0.00 0.00 0.00 0.17 1.34 1.21 29.52
Year Lowest Occurred 1985 1964 1978 1977 1982 1961 1984 1986 1975 1987 1976 1976 1976
Heating Degree Days (F) 784. 599. 536. 405. 247. 100. 32. 39. 108. 319. 543. 756. 4468.
Cooling Degree Days (F) 0. 0. 0. 0. 0. 49. 110. 135. 42. 0. 0. 0. 336.

Western Regional Climate Center, wrcc@dri.edu