RITZVILLE, WASHINGTON

NCDC 1961-1990 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Mean Max. Temperature (F) 34.0 42.1 51.1 60.1 68.8 77.8 85.9 85.4 75.7 62.3 44.8 35.0 60.3
Highest Mean Max. Temperature (F) 41.5 47.3 56.0 66.9 73.9 85.8 94.1 93.5 85.1 70.4 50.2 41.3 63.2
Year Highest Occurred 1983 1967 1968 1977 1987 1961 1985 1967 1963 1988 1981 1966 1987
Lowest Mean Max. Temperature (F) 20.5 31.8 44.2 53.9 62.4 70.7 79.7 79.6 66.8 55.8 30.4 22.9 56.4
Year Lowest Occurred 1979 1989 1971 1970 1984 1971 1983 1976 1985 1990 1985 1985 1985
Mean Temperature (F) 27.6 34.1 40.4 46.8 54.3 62.4 69.0 68.7 60.0 48.8 36.7 28.6 48.1
Highest Mean Temperature (F) 35.8 39.8 44.5 52.3 58.9 68.8 74.9 75.5 68.3 56.2 41.5 34.9 50.5
Year Highest Occurred 1981 1961 1986 1987 1987 1961 1985 1961 1963 1988 1965 1973 1987
Lowest Mean Temperature (F) 12.4 23.8 33.7 42.2 49.2 57.0 64.6 63.8 53.6 43.7 22.4 17.6 44.3
Year Lowest Occurred 1979 1989 1971 1970 1984 1981 1986 1980 1970 1990 1985 1985 1985
Mean Min. Temperature (F) 21.1 26.0 29.6 33.5 39.8 46.9 52.1 51.9 44.2 35.2 28.5 22.1 35.9
Highest Mean Min. Temperature (F) 30.7 32.3 33.8 37.8 43.9 51.7 56.5 57.5 51.5 42.0 33.7 29.4 37.8
Year Highest Occurred 1981 1961 1986 1989 1987 1961 1961 1961 1963 1988 1965 1973 1987
Lowest Mean Min. Temperature (F) 4.3 15.8 23.2 29.7 35.3 41.6 48.8 46.7 37.6 30.7 14.4 12.2 32.2
Year Lowest Occurred 1979 1989 1971 1968 1977 1976 1986 1969 1970 1969 1985 1985 1985
Mean Precipitation (in.) 1.17 1.09 1.11 0.86 0.91 0.65 0.40 0.44 0.56 0.80 1.60 1.73 11.32
Highest Precipitation (in.) 3.34 2.73 2.56 2.04 2.60 1.95 1.45 1.85 1.94 2.41 4.17 3.52 15.98
Year Highest Occurred 1970 1961 1989 1969 1980 1971 1990 1990 1973 1990 1973 1973 1983
Lowest Precipitation (in.) 0.17 0.01 0.06 0.04 0.08 0.06 0.00 0.00 0.00 0.00 0.21 0.32 6.40
Year Lowest Occurred 1963 1988 1965 1977 1966 1989 1985 1988 1989 1987 1976 1976 1976
Heating Degree Days (F) 1159. 865. 763. 546. 332. 143. 30. 56. 211. 502. 849. 1128. 6584.
Cooling Degree Days (F) 0. 0. 0. 0. 0. 65. 154. 171. 61. 0. 0. 0. 451.

Western Regional Climate Center, wrcc@dri.edu