RICHLAND, 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 47.2 57.2 65.1 73.3 80.3 87.9 87.7 78.5 65.3 49.1 39.8 64.3
Highest Mean Max. Temperature (F) 48.8 53.4 62.2 70.6 79.0 87.4 97.0 92.5 85.3 70.8 55.1 47.1 97.0
Year Highest Occurred 1994 1991 1992 1987 1993 1986 1985 1981 1990 1988 1990 1974 1985
Lowest Mean Max. Temperature (F) 21.8 33.9 50.6 59.6 67.7 74.3 79.7 83.2 71.8 62.6 36.4 26.7 21.8
Year Lowest Occurred 1979 1989 1993 1975 1996 1991 1993 1976 1986 2000 1985 1985 1979
Mean Temperature (F) 33.0 38.3 46.0 52.8 60.3 66.9 73.2 72.8 64.2 52.6 41.2 33.5 52.9
Highest Mean Temperature (F) 41.2 43.5 49.7 56.9 65.8 71.9 78.7 76.3 69.8 57.2 46.8 40.2 78.7
Year Highest Occurred 1994 1995 1986 1987 1993 1986 1985 1971 1990 1988 1990 1973 1985
Lowest Mean Temperature (F) 14.3 25.3 41.2 47.3 55.7 62.8 68.0 68.9 59.3 49.9 29.1 22.8 14.3
Year Lowest Occurred 1979 1989 1993 1975 1984 1991 1993 1980 1983 1984 1985 1985 1979
Mean Min. Temperature (F) 26.0 29.3 34.7 40.4 47.3 53.5 58.5 57.9 49.8 39.9 33.2 27.1 41.5
Highest Mean Min. Temperature (F) 34.5 34.6 39.2 44.8 52.5 58.0 64.4 61.5 54.4 43.9 38.4 34.1 64.4
Year Highest Occurred 1990 1999 1983 1994 1993 1992 1998 1991 1998 1979 1990 1973 1998
Lowest Mean Min. Temperature (F) 6.8 16.6 30.3 35.1 43.2 49.3 55.2 54.1 44.7 35.9 21.7 17.2 6.8
Year Lowest Occurred 1979 1989 1976 1975 1984 1976 1976 1980 1983 1978 1985 1983 1979
Mean Precipitation (in.) 0.97 0.75 0.71 0.57 0.61 0.41 0.25 0.30 0.34 0.53 1.07 1.04 7.55
Highest Precipitation (in.) 2.17 1.61 1.59 1.41 1.77 0.89 1.63 1.82 1.04 1.59 2.78 2.83 2.83
Year Highest Occurred 1978 1983 1989 1993 1980 1980 1998 1977 1977 1982 1973 1973 1973
Lowest Precipitation (in.) 0.13 0.07 0.03 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.07 0.21 0.00
Year Lowest Occurred 1977 1988 1994 1977 1992 1999 1999 1998 1999 1987 1976 1976 1977
Heating Degree Days (F) 993. 749. 590. 369. 172. 54. 8. 8. 112. 386. 715. 977. 5133.
Cooling Degree Days (F) 0. 0. 0. 1. 27. 113. 261. 251. 86. 0. 0. 0. 739.

Western Regional Climate Center, wrcc@dri.edu