RITZVILLE, WASHINGTON

NCDC 1971-2000 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Monthly
Mean Max. Temperature (F) 34.3 41.5 51.2 60.3 68.6 76.4 85.3 85.4 75.7 62.1 44.1 34.7 60.0
Highest Mean Max. Temperature (F) 43.3 48.3 58.2 66.9 74.0 84.6 94.1 92.3 82.7 70.4 51.6 40.3 94.1
Year Highest Occurred 1994 1998 1992 1977 1992 1986 1985 1971 1990 1988 1999 1973 1985
Lowest Mean Max. Temperature (F) 20.5 31.8 44.2 54.1 62.4 70.7 75.3 79.6 66.8 55.8 30.4 22.9 20.5
Year Lowest Occurred 1979 1989 1971 1975 1984 1991 1993 1976 1985 1990 1985 1985 1979
Mean Temperature (F) 28.4 33.9 40.7 47.2 54.6 61.7 69.0 69.1 60.7 49.4 36.9 29.0 48.4
Highest Mean Temperature (F) 36.5 39.8 46.1 52.5 59.8 67.9 75.4 74.5 66.5 57.0 43.0 36.1 75.4
Year Highest Occurred 1994 1998 1992 1987 1993 1986 1985 1971 1998 1988 1999 1973 1985
Lowest Mean Temperature (F) 12.8 24.1 34.1 42.8 49.6 56.4 61.9 64.0 54.8 43.7 23.1 18.2 12.8
Year Lowest Occurred 1979 1989 1971 1975 1984 1991 1993 1995 1985 1990 1985 1985 1979
Mean Min. Temperature (F) 22.5 26.2 30.1 34.1 40.6 47.0 52.7 52.8 45.6 36.6 29.7 23.3 36.8
Highest Mean Min. Temperature (F) 31.5 31.9 34.2 38.4 45.9 51.5 58.0 57.7 50.3 43.5 34.6 31.9 58.0
Year Highest Occurred 1981 1983 1986 1989 1993 1989 1998 1977 1998 1988 1989 1973 1998
Lowest Mean Min. Temperature (F) 5.1 16.3 24.0 30.6 35.5 42.0 48.4 47.3 40.6 31.5 15.9 12.5 5.1
Year Lowest Occurred 1979 1989 1971 1999 1999 1991 1993 1995 1992 1990 1985 1990 1979
Mean Precipitation (in.) 1.33 1.17 1.21 0.92 1.01 0.74 0.55 0.45 0.60 0.90 1.66 1.77 12.31
Highest Precipitation (in.) 2.45 2.64 2.56 2.11 2.60 2.08 3.81 1.85 1.94 3.40 4.17 3.64 4.17
Year Highest Occurred 1997 1999 1989 1993 1980 1995 1993 1990 1973 1996 1973 1996 1973
Lowest Precipitation (in.) 0.31 0.01 0.23 0.04 0.20 0.06 0.00 0.00 0.00 0.00 0.21 0.32 0.00
Year Lowest Occurred 1977 1988 1994 1977 1992 1989 1996 2000 1999 1987 1976 1976 1996
Heating Degree Days (F) 1135. 872. 754. 534. 331. 157. 45. 42. 192. 488. 844. 1115. 6509.
Cooling Degree Days (F) 0. 0. 0. 0. 8. 58. 169. 169. 61. 1. 0. 0. 466.

Western Regional Climate Center, wrcc@dri.edu