SUNNYSIDE, WASHINGTON

NCDC 1971-2000 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Monthly
Mean Max. Temperature (F) 39.9 47.8 58.4 66.7 75.1 82.1 89.4 89.0 79.9 67.3 50.3 39.7 65.5
Highest Mean Max. Temperature (F) 48.0 54.7 64.5 72.3 81.4 88.7 97.0 93.4 86.8 75.8 58.9 47.7 97.0
Year Highest Occurred 1990 1988 1992 1977 1992 1986 1985 1986 1990 1988 1999 1999 1985
Lowest Mean Max. Temperature (F) 23.2 37.9 51.5 60.6 69.9 75.5 81.9 82.7 72.5 64.0 37.7 26.9 23.2
Year Lowest Occurred 1979 1989 1993 1975 1977 1971 1993 1976 1986 1975 1985 1985 1979
Mean Temperature (F) 32.4 38.3 46.2 53.0 60.7 67.3 72.9 72.0 63.5 52.3 40.7 32.5 52.7
Highest Mean Temperature (F) 39.8 43.0 50.7 57.4 65.3 72.8 79.0 75.6 69.0 60.1 48.5 38.7 79.0
Year Highest Occurred 1990 1995 1992 1990 1993 1986 1998 1977 1990 1988 1999 1999 1998
Lowest Mean Temperature (F) 15.9 28.6 41.0 47.6 56.2 62.6 67.7 68.2 58.7 49.5 28.9 22.5 15.9
Year Lowest Occurred 1979 1989 1971 1975 1977 1971 1993 1976 1971 1984 1985 1985 1979
Mean Min. Temperature (F) 24.9 28.7 33.9 39.2 46.2 52.4 56.3 55.0 47.1 37.3 31.1 25.3 39.8
Highest Mean Min. Temperature (F) 32.8 34.4 38.4 43.0 50.7 56.8 62.7 58.7 51.8 44.3 38.1 30.6 62.7
Year Highest Occurred 1981 1992 1983 1994 1993 1992 1998 1997 1998 1988 1999 1980 1998
Lowest Mean Min. Temperature (F) 8.6 19.3 30.3 34.4 42.1 47.6 52.8 50.9 43.5 34.1 20.0 17.4 8.6
Year Lowest Occurred 1979 1989 1971 1982 1996 1976 1986 1973 1972 1978 1985 1990 1979
Mean Precipitation (in.) 0.88 0.60 0.62 0.51 0.55 0.42 0.19 0.30 0.47 0.53 0.96 1.16 7.19
Highest Precipitation (in.) 2.76 1.61 2.12 1.57 2.40 1.76 0.68 1.41 2.62 1.77 3.20 5.27 5.27
Year Highest Occurred 1995 1983 1983 1995 1972 1991 1995 1977 1986 1982 1973 1994 1994
Lowest Precipitation (in.) 0.06 0.00 0.03 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Year Lowest Occurred 1984 1988 1992 1985 1992 1987 1990 1996 1991 1988 1990 1992 1988
Heating Degree Days (F) 1011. 750. 585. 364. 167. 53. 12. 10. 120. 395. 729. 1009. 5205.
Cooling Degree Days (F) 0. 0. 0. 3. 31. 121. 256. 227. 75. 1. 0. 0. 714.

Western Regional Climate Center, wrcc@dri.edu