SUMMIT 1 W, SOUTH DAKOTA

NCDC 1961-1990 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Mean Max. Temperature (F) 18.4 24.1 36.7 54.4 67.7 76.8 82.6 80.7 70.4 57.9 38.2 22.9 52.6
Highest Mean Max. Temperature (F) 34.5 39.4 51.0 65.7 75.5 87.2 89.2 88.9 76.3 66.4 45.3 36.8 57.7
Year Highest Occurred 1990 1987 1968 1987 1988 1988 1988 1983 1978 1963 1980 1979 1987
Lowest Mean Max. Temperature (F) 6.5 12.7 24.6 40.0 62.2 69.4 75.5 74.9 56.1 49.4 25.9 6.0 49.0
Year Lowest Occurred 1979 1979 1965 1975 1979 1969 1962 1977 1965 1969 1985 1983 1972
Mean Temperature (F) 8.4 14.2 27.2 42.7 55.4 64.6 70.1 68.1 57.9 46.1 28.6 13.5 41.4
Highest Mean Temperature (F) 23.8 29.7 36.9 50.6 63.5 73.2 74.6 74.6 64.0 55.6 35.0 25.9 46.3
Year Highest Occurred 1990 1987 1968 1987 1977 1988 1988 1983 1978 1963 1980 1979 1987
Lowest Mean Temperature (F) -3.8 2.6 15.3 33.0 49.9 58.1 65.0 62.4 47.9 40.8 16.0 -5.2 38.6
Year Lowest Occurred 1982 1979 1965 1975 1979 1969 1971 1977 1965 1969 1985 1983 1979
Mean Min. Temperature (F) -1.7 4.3 17.7 31.0 43.0 52.4 57.7 55.5 45.4 34.2 19.0 4.1 30.2
Highest Mean Min. Temperature (F) 13.1 20.0 27.5 36.9 51.5 59.1 62.0 60.6 51.6 44.8 26.0 16.2 34.8
Year Highest Occurred 1990 1987 1973 1977 1977 1988 1966 1973 1978 1963 1962 1965 1987
Lowest Mean Min. Temperature (F) -14.6 -7.6 5.9 23.8 36.9 46.0 52.1 49.6 38.9 27.8 6.0 -16.3 27.2
Year Lowest Occurred 1982 1979 1965 1983 1983 1982 1971 1985 1984 1976 1985 1983 1985
Mean Precipitation (in.) 0.43 0.45 1.31 2.03 3.02 3.31 3.20 2.82 1.99 1.50 0.69 0.34 21.09
Highest Precipitation (in.) 1.25 1.38 6.46 6.56 9.34 9.44 8.15 4.85 4.76 5.14 2.48 0.83 33.92
Year Highest Occurred 1969 1962 1977 1986 1962 1971 1963 1989 1965 1984 1977 1977 1977
Lowest Precipitation (in.) 0.00 0.00 0.01 0.36 0.52 0.52 0.74 0.88 0.11 0.00 0.00 0.00 9.71
Year Lowest Occurred 1974 1968 1971 1982 1976 1961 1967 1969 1979 1964 1979 1986 1976
Heating Degree Days (F) 1755. 1422. 1172. 669. 315. 95. 26. 53. 235. 586. 1092. 1597. 9017.
Cooling Degree Days (F) 0. 0. 0. 0. 17. 83. 185. 149. 22. 0. 0. 0. 456.

Western Regional Climate Center, wrcc@dri.edu