BOUNDARY DAM, WASHINGTON

NCDC 1971-2000 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Monthly
Mean Max. Temperature (F) 31.4 38.2 47.8 58.7 66.3 72.0 81.3 82.9 71.8 56.3 39.9 31.7 56.5
Highest Mean Max. Temperature (F) 37.0 42.8 57.6 65.7 75.5 82.3 92.9 90.1 80.2 61.8 44.4 37.5 92.9
Year Highest Occurred 1981 1991 1992 1977 1993 1992 1985 1971 1990 1974 1987 1979 1985
Lowest Mean Max. Temperature (F) 20.5 31.0 42.9 53.0 58.0 64.8 70.9 74.2 64.4 51.4 29.7 25.0 20.5
Year Lowest Occurred 1979 1989 1971 1976 1984 1984 1993 1976 1985 1995 1985 1983 1979
Mean Temperature (F) 24.3 29.5 37.0 45.7 53.4 59.5 65.9 65.9 56.8 45.0 33.5 25.5 45.2
Highest Mean Temperature (F) 31.5 35.8 43.6 49.5 59.4 66.9 72.0 70.2 63.3 49.0 39.0 31.8 72.0
Year Highest Occurred 1994 1991 1992 1987 1993 1992 1998 1971 1998 1988 1987 1979 1998
Lowest Mean Temperature (F) 9.9 21.0 31.4 41.7 47.3 54.3 60.5 61.4 51.5 41.6 21.9 16.6 9.9
Year Lowest Occurred 1979 1989 1976 1997 1984 1984 1993 1995 1985 1985 1985 1983 1979
Mean Min. Temperature (F) 17.1 20.7 26.2 32.6 40.4 47.0 50.5 48.9 41.7 33.6 27.0 19.3 33.8
Highest Mean Min. Temperature (F) 26.4 29.1 33.1 36.3 45.0 51.5 56.5 51.8 46.4 38.2 33.6 26.7 56.5
Year Highest Occurred 1992 1992 1983 1994 1980 1992 1998 1991 1998 1988 1987 1999 1998
Lowest Mean Min. Temperature (F) -0.7 10.9 19.7 28.1 36.5 43.6 47.0 45.4 38.0 28.6 14.0 8.1 -0.7
Year Lowest Occurred 1979 1989 1976 1975 1984 1976 1999 1984 1999 1991 1985 1983 1979
Mean Precipitation (in.) 2.78 2.27 2.21 2.12 2.80 2.76 1.82 1.57 1.50 1.86 3.24 3.46 28.39
Highest Precipitation (in.) 4.61 5.57 5.06 4.42 6.40 4.67 5.23 4.45 3.92 3.94 7.18 6.33 7.18
Year Highest Occurred 1992 1979 1995 1996 1998 1981 1997 1976 1997 1996 1973 1998 1973
Lowest Precipitation (in.) 0.29 0.36 0.49 0.51 0.88 0.81 0.02 0.07 0.07 0.04 0.72 0.65 0.02
Year Lowest Occurred 1985 1993 1985 1977 1983 1974 1985 1992 1990 1974 1979 1985 1985
Heating Degree Days (F) 1264. 995. 868. 581. 364. 196. 78. 66. 270. 622. 946. 1223. 7473.
Cooling Degree Days (F) 0. 0. 0. 0. 4. 31. 105. 94. 22. 0. 0. 0. 256.

Western Regional Climate Center, wrcc@dri.edu