STEPHAN 2 NW, SOUTH DAKOTA

NCDC 1971-2000 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Monthly
Mean Max. Temperature (F) 25.0 30.6 42.7 57.5 69.8 79.7 86.6 85.0 75.2 60.9 40.9 28.2 56.8
Highest Mean Max. Temperature (F) 38.0 42.4 53.5 65.7 77.8 89.4 93.7 93.3 83.3 67.2 56.2 42.0 93.7
Year Highest Occurred 1990 2000 2000 1987 1985 1988 1974 1983 1998 1974 1999 1979 1974
Lowest Mean Max. Temperature (F) 9.6 14.3 33.1 46.7 61.8 73.0 75.0 77.7 66.9 56.8 25.6 8.2 8.2
Year Lowest Occurred 1978 1978 1996 1995 1996 1993 1992 1992 1985 1972 1985 1983 1983
Mean Temperature (F) 12.8 18.8 30.5 44.1 56.5 66.4 72.4 70.6 60.4 46.5 29.0 16.6 43.7
Highest Mean Temperature (F) 26.7 30.5 38.8 50.5 63.4 75.3 78.0 77.1 68.1 51.1 40.8 26.9 78.0
Year Highest Occurred 1990 1999 2000 1977 1977 1988 1974 1983 1998 1973 1999 1999 1974
Lowest Mean Temperature (F) -2.3 4.4 22.2 37.0 49.5 59.9 64.6 62.6 54.8 41.9 15.7 -2.0 -2.3
Year Lowest Occurred 1978 1979 1996 1995 1983 1982 1992 1985 1984 1976 1985 1983 1978
Mean Min. Temperature (F) 0.6 6.9 18.3 30.7 43.2 53.0 58.2 56.1 45.6 32.1 17.0 4.9 30.6
Highest Mean Min. Temperature (F) 15.3 21.3 26.4 36.4 50.2 61.1 62.5 60.9 52.9 37.5 26.1 15.9 62.5
Year Highest Occurred 1990 1998 1973 1977 1977 1988 1989 1983 1998 1994 1987 1997 1989
Lowest Mean Min. Temperature (F) -14.6 -8.5 10.6 24.0 33.7 46.2 51.5 46.9 37.9 25.9 5.8 -12.2 -14.6
Year Lowest Occurred 1982 1979 1975 1982 1983 1982 1985 1985 1984 1976 1985 1983 1982
Mean Precipitation (in.) 0.41 0.50 1.31 1.98 2.95 2.95 2.62 2.07 1.77 1.75 0.65 0.41 19.37
Highest Precipitation (in.) 1.78 2.01 3.93 5.44 7.62 5.75 6.17 5.47 7.06 7.07 1.97 2.06 7.62
Year Highest Occurred 1997 1987 1982 1986 1999 1998 1993 1990 1996 1998 1993 1996 1999
Lowest Precipitation (in.) 0.00 0.00 0.10 0.09 0.27 0.82 0.39 0.22 0.00 0.14 0.00 0.00 0.00
Year Lowest Occurred 1981 1983 1972 1992 1992 1996 1976 1972 1980 1978 1990 1995 1981
Heating Degree Days (F) 1619. 1295. 1070. 628. 287. 78. 21. 45. 193. 574. 1082. 1502. 8394.
Cooling Degree Days (F) 0. 0. 0. 1. 24. 118. 250. 216. 55. 0. 0. 0. 664.

Western Regional Climate Center, wrcc@dri.edu