STEPHAN 2 NW, SOUTH DAKOTA

NCDC 1961-1990 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Mean Max. Temperature (F) 26.1 32.1 43.9 60.4 72.0 81.8 89.2 87.5 76.6 63.6 44.6 30.1 59.0
Highest Mean Max. Temperature (F) 39.5 44.3 55.8 68.1 80.1 90.7 95.7 96.0 85.6 73.8 55.4 44.3 62.6
Year Highest Occurred 1990 1976 1968 1981 1985 1988 1974 1983 1978 1963 1981 1979 1976
Lowest Mean Max. Temperature (F) 11.6 17.1 31.5 51.1 64.2 74.0 82.2 81.1 61.5 54.2 27.6 10.5 55.6
Year Lowest Occurred 1978 1978 1969 1975 1967 1969 1962 1985 1965 1969 1985 1983 1972
Mean Temperature (F) 13.7 19.9 31.3 45.8 57.2 67.1 73.7 71.5 60.7 48.4 31.8 18.1 44.9
Highest Mean Temperature (F) 28.8 32.6 39.6 52.4 64.7 76.0 79.1 78.8 67.9 57.2 39.0 29.2 49.4
Year Highest Occurred 1990 1987 1986 1977 1977 1988 1974 1983 1978 1963 1981 1979 1987
Lowest Mean Temperature (F) 0.1 7.5 19.3 38.9 50.5 60.1 69.0 64.3 49.5 41.8 18.0 0.7 41.8
Year Lowest Occurred 1978 1979 1965 1961 1967 1985 1962 1985 1965 1969 1985 1983 1985
Mean Min. Temperature (F) 1.3 7.6 18.6 31.1 42.3 52.3 58.2 55.5 44.9 33.1 19.0 6.1 30.8
Highest Mean Min. Temperature (F) 18.1 22.1 28.6 37.4 50.4 61.3 63.0 61.5 51.4 40.5 28.6 17.4 36.6
Year Highest Occurred 1990 1987 1973 1977 1977 1988 1966 1983 1990 1963 1987 1965 1987
Lowest Mean Min. Temperature (F) -11.8 -5.1 6.5 22.4 33.9 43.2 51.6 47.5 37.5 27.8 8.3 -9.2 26.6
Year Lowest Occurred 1982 1979 1965 1961 1983 1985 1985 1985 1965 1976 1985 1983 1985
Mean Precipitation (in.) 0.29 0.45 1.16 1.91 2.58 2.95 2.69 2.10 1.57 1.30 0.47 0.34 17.81
Highest Precipitation (in.) 1.47 2.01 3.93 5.73 7.82 5.25 8.36 5.47 4.48 4.63 1.74 1.02 27.69
Year Highest Occurred 1982 1987 1982 1964 1962 1967 1968 1990 1985 1980 1985 1988 1982
Lowest Precipitation (in.) 0.00 0.00 0.10 0.14 0.52 0.95 0.39 0.17 0.00 0.00 0.00 0.00 9.13
Year Lowest Occurred 1981 1983 1972 1969 1976 1973 1976 1969 1980 1964 1990 1986 1976
Heating Degree Days (F) 1590. 1263. 1045. 576. 269. 73. 10. 35. 186. 515. 996. 1454. 8012.
Cooling Degree Days (F) 0. 0. 0. 0. 27. 136. 280. 237. 57. 0. 0. 0. 737.

Western Regional Climate Center, wrcc@dri.edu