PETERSONS RANCH, WASHINGTON

NCDC 1971-2000 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Monthly
Mean Max. Temperature (F) 42.6 46.5 52.1 57.8 65.2 70.9 78.0 78.5 73.0 62.0 48.9 42.8 59.9
Highest Mean Max. Temperature (F) 48.8 55.9 63.8 65.0 76.0 79.4 87.1 85.9 80.0 72.2 54.7 47.6 87.1
Year Highest Occurred 1994 1991 1992 2000 1992 1992 1985 1986 1991 1987 1997 1989 1985
Lowest Mean Max. Temperature (F) 31.6 39.1 45.0 50.7 57.2 63.9 69.9 68.7 62.7 56.2 39.6 37.0 31.6
Year Lowest Occurred 1979 1979 1977 1975 1977 1981 1993 1975 1978 1984 1985 1990 1979
Mean Temperature (F) 37.9 40.6 44.4 48.7 55.1 60.1 65.7 65.9 61.9 53.4 43.7 38.3 51.3
Highest Mean Temperature (F) 43.1 48.3 52.6 53.6 62.4 65.8 70.9 70.5 66.0 58.9 48.7 42.0 70.9
Year Highest Occurred 1994 1992 1992 2000 1992 1992 1996 1986 1998 1987 1997 1991 1996
Lowest Mean Temperature (F) 27.8 34.0 39.2 42.3 49.4 55.9 60.8 59.7 56.3 49.0 33.5 31.8 27.8
Year Lowest Occurred 1979 1989 1977 1975 1977 1971 1986 1975 1977 1984 1985 1990 1979
Mean Min. Temperature (F) 33.2 34.6 36.6 39.6 44.9 49.2 53.3 53.3 50.7 44.7 38.5 33.7 42.7
Highest Mean Min. Temperature (F) 38.3 41.6 41.9 44.8 49.3 54.4 58.3 56.9 53.9 49.8 43.2 38.5 58.3
Year Highest Occurred 1992 1992 1983 1992 1993 1982 1998 1999 1995 1988 1995 1991 1998
Lowest Mean Min. Temperature (F) 23.9 27.7 32.0 33.9 41.5 46.6 49.1 48.3 45.6 40.3 27.4 26.5 23.9
Year Lowest Occurred 1979 1989 1976 1975 1974 1991 1986 1973 1972 1990 1985 1990 1979
Mean Precipitation (in.) 17.20 15.06 12.14 8.71 5.43 3.93 1.54 1.90 4.41 8.42 18.33 19.11 116.18
Highest Precipitation (in.) 29.90 30.95 24.11 19.32 11.35 10.64 6.79 6.45 11.45 21.25 32.52 35.25 35.25
Year Highest Occurred 1990 1999 1997 1996 1984 1981 1983 1977 1997 1997 1983 1996 1996
Lowest Precipitation (in.) 0.49 2.31 1.82 2.55 0.38 0.97 0.00 0.02 0.03 0.23 4.85 4.91 0.00
Year Lowest Occurred 1985 1993 1992 1977 1992 1979 1984 1998 1993 1987 1976 1985 1984
Heating Degree Days (F) 840. 685. 641. 489. 320. 170. 81. 78. 152. 365. 639. 830. 5290.
Cooling Degree Days (F) 0. 0. 0. 0. 11. 22. 100. 107. 56. 3. 0. 0. 299.

Western Regional Climate Center, wrcc@dri.edu