STEHEKIN 4 NW, WASHINGTON

NCDC 1961-1990 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Mean Max. Temperature (F) 32.7 38.9 47.6 58.3 68.0 75.9 82.7 81.9 71.6 56.9 41.4 33.1 57.4
Highest Mean Max. Temperature (F) 37.7 44.1 54.2 64.3 74.0 81.4 94.1 89.9 79.0 62.9 47.4 37.1 60.1
Year Highest Occurred 1981 1967 1981 1977 1983 1978 1985 1986 1990 1987 1987 1989 1987
Lowest Mean Max. Temperature (F) 24.0 32.6 40.8 52.1 62.7 69.7 75.2 74.1 65.4 53.0 32.2 26.1 55.5
Year Lowest Occurred 1969 1989 1971 1972 1962 1981 1983 1964 1978 1968 1985 1983 1964
Mean Temperature (F) 27.8 32.3 38.5 46.9 55.0 62.4 67.8 67.4 58.2 46.6 35.8 28.7 47.3
Highest Mean Temperature (F) 33.6 36.7 43.3 51.9 59.5 66.8 76.3 73.8 64.1 51.6 41.3 33.3 49.8
Year Highest Occurred 1981 1961 1981 1990 1983 1986 1985 1977 1990 1988 1987 1989 1987
Lowest Mean Temperature (F) 18.3 25.5 33.7 42.0 52.0 58.2 63.1 60.5 53.7 43.4 27.3 21.1 45.0
Year Lowest Occurred 1969 1989 1971 1972 1974 1966 1983 1964 1970 1968 1985 1983 1969
Mean Min. Temperature (F) 22.8 25.7 29.4 35.5 42.1 48.8 52.9 52.9 44.9 36.3 30.1 24.3 37.1
Highest Mean Min. Temperature (F) 29.5 31.9 33.1 40.4 44.9 52.4 58.4 57.8 49.2 41.6 35.7 29.5 39.4
Year Highest Occurred 1981 1961 1961 1990 1983 1986 1985 1977 1990 1988 1989 1989 1987
Lowest Mean Min. Temperature (F) 12.2 17.9 22.5 31.5 38.9 45.4 49.2 46.9 39.7 32.6 22.3 16.0 34.1
Year Lowest Occurred 1979 1969 1965 1982 1965 1976 1969 1964 1964 1964 1985 1983 1969
Mean Precipitation (in.) 6.41 3.95 2.86 1.51 0.97 0.83 0.52 0.94 1.32 2.90 6.17 7.14 35.52
Highest Precipitation (in.) 12.01 7.97 5.64 4.26 2.23 2.23 2.58 3.08 3.56 8.90 13.13 13.33 51.55
Year Highest Occurred 1982 1982 1972 1989 1984 1972 1983 1963 1978 1967 1990 1979 1990
Lowest Precipitation (in.) 0.59 0.81 0.32 0.03 0.15 0.11 0.00 0.00 0.00 0.00 1.53 1.40 24.06
Year Lowest Occurred 1985 1973 1965 1973 1983 1989 1984 1981 1976 1987 1979 1985 1985
Heating Degree Days (F) 1153. 916. 822. 543. 310. 124. 57. 74. 224. 570. 876. 1125. 6794.
Cooling Degree Days (F) 0. 0. 0. 0. 0. 46. 144. 148. 20. 0. 0. 0. 358.

Western Regional Climate Center, wrcc@dri.edu