MELLETTE 4 W, 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) 21.2 28.5 40.3 57.3 70.2 79.2 84.9 83.8 73.5 59.7 39.4 26.1 55.3
Highest Mean Max. Temperature (F) 36.3 42.0 53.1 67.0 78.2 90.7 92.1 91.6 81.0 64.9 54.0 38.1 92.1
Year Highest Occurred 1990 1987 1981 1987 1977 1988 1975 1976 1978 1974 1999 1979 1975
Lowest Mean Max. Temperature (F) 6.7 13.3 30.9 45.5 62.5 72.8 73.5 77.0 65.0 55.8 27.6 8.1 6.7
Year Lowest Occurred 1978 1979 1996 1975 1996 1993 1992 1992 1985 1995 1996 1983 1978
Mean Temperature (F) 10.1 17.5 29.8 44.8 57.4 66.7 71.9 70.0 59.1 45.9 28.8 15.5 43.1
Highest Mean Temperature (F) 25.3 30.7 38.3 51.5 64.7 75.3 77.7 76.5 65.2 50.9 39.5 26.0 77.7
Year Highest Occurred 1990 1987 2000 1977 1977 1988 1974 1983 1998 1973 1999 1997 1974
Lowest Mean Temperature (F) -4.2 2.1 21.0 38.8 51.1 61.1 63.5 64.4 53.3 41.7 17.6 -1.5 -4.2
Year Lowest Occurred 1978 1979 1996 1995 1983 1982 1992 1992 1984 1976 1985 1983 1978
Mean Min. Temperature (F) -1.0 6.5 19.3 32.2 44.5 54.2 58.8 56.2 44.7 32.1 18.1 4.8 30.9
Highest Mean Min. Temperature (F) 14.2 20.1 29.0 38.0 51.2 60.7 63.6 61.6 49.5 37.7 25.9 16.9 63.6
Year Highest Occurred 1990 1984 1973 1977 1977 1991 1974 1983 1998 1973 1998 1997 1974
Lowest Mean Min. Temperature (F) -15.6 -9.2 11.1 25.7 36.6 47.6 53.5 49.9 37.9 26.3 7.3 -11.1 -15.6
Year Lowest Occurred 1982 1979 1996 1988 1983 1982 1992 1977 1984 1976 1985 1983 1982
Mean Precipitation (in.) 0.54 0.56 1.39 2.14 2.82 3.39 2.86 2.94 1.96 1.67 0.84 0.43 21.54
Highest Precipitation (in.) 1.98 1.40 5.10 7.66 6.04 8.20 8.91 7.06 5.99 8.68 3.06 1.41 8.91
Year Highest Occurred 1997 1977 1977 1986 1978 1984 1993 1984 1996 1998 1977 1977 1993
Lowest Precipitation (in.) 0.02 0.03 0.02 0.13 0.42 0.96 0.23 0.25 0.01 0.11 0.00 0.00 0.00
Year Lowest Occurred 1974 1985 1971 1996 1992 1972 1975 1996 1979 1978 1999 1986 1999
Heating Degree Days (F) 1704. 1330. 1092. 608. 266. 74. 25. 39. 207. 592. 1087. 1536. 8560.
Cooling Degree Days (F) 0. 0. 0. 1. 30. 124. 238. 194. 30. 0. 0. 0. 617.

Western Regional Climate Center, wrcc@dri.edu