SISTERS, OREGON

NCDC 1961-1990 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Mean Max. Temperature (F) 39.8 45.3 50.9 57.2 65.3 74.5 83.2 82.7 74.2 63.6 47.2 40.2 60.3
Highest Mean Max. Temperature (F) 45.6 52.7 57.4 70.9 70.7 83.4 91.9 90.1 81.7 73.1 51.8 46.7 63.7
Year Highest Occurred 1983 1963 1986 1987 1969 1986 1985 1986 1987 1988 1989 1980 1987
Lowest Mean Max. Temperature (F) 25.0 35.1 45.4 46.9 58.0 63.9 76.8 74.9 68.0 56.5 39.4 30.0 57.1
Year Lowest Occurred 1979 1989 1975 1984 1962 1984 1963 1976 1985 1984 1978 1983 1984
Mean Temperature (F) 29.6 34.2 38.3 42.6 49.0 56.7 62.3 61.9 54.3 46.4 36.4 30.1 45.2
Highest Mean Temperature (F) 35.5 41.1 43.0 50.3 53.8 61.8 67.7 67.2 60.7 53.3 39.9 35.7 47.0
Year Highest Occurred 1967 1963 1986 1987 1969 1986 1985 1967 1963 1988 1962 1980 1987
Lowest Mean Temperature (F) 13.9 22.4 34.1 37.5 45.1 49.2 57.9 57.7 49.7 42.8 25.7 20.3 43.0
Year Lowest Occurred 1979 1989 1975 1984 1977 1984 1963 1975 1985 1969 1978 1985 1984
Mean Min. Temperature (F) 19.3 23.1 25.6 27.9 32.7 38.9 41.3 41.1 34.4 29.1 25.5 19.8 29.9
Highest Mean Min. Temperature (F) 26.4 30.1 31.7 32.0 37.0 44.5 45.3 46.5 42.2 34.0 29.7 28.0 31.8
Year Highest Occurred 1990 1983 1983 1989 1971 1969 1975 1961 1963 1979 1965 1973 1967
Lowest Mean Min. Temperature (F) 2.8 9.7 19.9 22.7 27.6 34.0 36.9 35.8 29.7 24.9 12.0 6.8 26.2
Year Lowest Occurred 1979 1989 1965 1982 1965 1976 1981 1980 1964 1974 1978 1985 1985
Mean Precipitation (in.) 2.50 1.70 1.25 0.80 0.63 0.61 0.41 0.43 0.48 0.90 2.14 2.57 14.42
Highest Precipitation (in.) 5.22 5.26 3.09 2.53 2.44 2.60 2.45 2.27 2.06 4.75 6.20 12.24 24.38
Year Highest Occurred 1970 1986 1983 1980 1981 1980 1987 1976 1982 1984 1984 1964 1980
Lowest Precipitation (in.) 0.11 0.02 0.10 0.00 0.06 0.02 0.00 0.00 0.00 0.00 0.31 0.15 7.58
Year Lowest Occurred 1985 1964 1965 1977 1976 1983 1989 1988 1975 1988 1969 1976 1985
Heating Degree Days (F) 1097. 862. 828. 672. 496. 265. 121. 144. 329. 577. 858. 1082. 7331.
Cooling Degree Days (F) 0. 0. 0. 0. 0. 16. 37. 48. 8. 0. 0. 0. 109.

Western Regional Climate Center, wrcc@dri.edu