LEWISTON NEZ PERCE CO AP, IDAHO

NCDC 1961-1990 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Mean Max. Temperature (F) 39.6 46.6 53.5 61.5 70.2 79.8 89.0 88.3 77.2 63.2 48.1 40.2 63.1
Highest Mean Max. Temperature (F) 47.3 50.9 59.1 70.1 74.4 86.9 96.7 96.4 88.0 71.5 54.0 46.5 66.1
Year Highest Occurred 1983 1988 1990 1977 1966 1961 1985 1967 1990 1988 1989 1979 1990
Lowest Mean Max. Temperature (F) 22.5 33.1 48.6 54.9 63.4 73.6 82.6 82.0 66.8 57.6 35.1 27.9 59.5
Year Lowest Occurred 1979 1989 1971 1975 1962 1981 1986 1964 1985 1969 1985 1985 1985
Mean Temperature (F) 33.6 39.1 44.1 50.6 58.4 66.9 74.1 73.7 64.1 52.3 41.3 34.5 52.7
Highest Mean Temperature (F) 41.9 43.6 48.8 57.0 62.3 72.3 80.0 79.1 73.0 58.7 47.1 40.4 55.9
Year Highest Occurred 1990 1968 1986 1990 1987 1977 1985 1967 1990 1988 1990 1980 1990
Lowest Mean Temperature (F) 16.9 26.6 39.5 45.7 54.2 62.2 68.9 68.6 56.8 48.3 29.0 23.2 49.2
Year Lowest Occurred 1979 1989 1965 1970 1962 1981 1986 1964 1985 1969 1985 1985 1985
Mean Min. Temperature (F) 27.6 31.5 34.7 39.7 46.5 53.9 59.2 58.9 50.9 41.4 34.4 28.7 42.3
Highest Mean Min. Temperature (F) 36.5 36.5 39.5 46.0 50.4 58.1 64.0 63.0 57.9 45.9 40.6 34.9 45.6
Year Highest Occurred 1990 1968 1986 1990 1987 1977 1975 1977 1990 1988 1990 1966 1990
Lowest Mean Min. Temperature (F) 11.2 20.0 28.1 35.9 43.7 50.3 55.2 54.1 46.0 38.3 22.8 18.5 38.9
Year Lowest Occurred 1979 1989 1965 1970 1965 1976 1986 1980 1971 1984 1985 1985 1985
Mean Precipitation (in.) 1.28 0.89 1.09 1.13 1.31 1.25 0.67 0.78 0.78 0.90 1.15 1.20 12.43
Highest Precipitation (in.) 3.55 1.99 2.70 3.29 2.83 3.11 2.60 2.96 2.22 1.98 2.79 3.28 15.44
Year Highest Occurred 1970 1986 1972 1978 1962 1964 1987 1989 1977 1982 1973 1964 1971
Lowest Precipitation (in.) 0.24 0.17 0.25 0.10 0.27 0.24 0.01 0.00 0.00 0.00 0.23 0.14 8.52
Year Lowest Occurred 1985 1988 1969 1977 1964 1973 1973 1969 1975 1987 1976 1970 1974
Heating Degree Days (F) 973. 725. 648. 436. 210. 64. 6. 16. 141. 394. 711. 946. 5270.
Cooling Degree Days (F) 0. 0. 0. 0. 6. 121. 288. 285. 114. 0. 0. 0. 814.

Western Regional Climate Center, wrcc@dri.edu