WATERTOWN RGNL AP, SOUTH DAKOTA

NCDC 1961-1990 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Mean Max. Temperature (F) 21.4 26.8 39.5 56.4 69.2 78.8 84.9 82.9 71.7 59.2 40.1 25.7 54.7
Highest Mean Max. Temperature (F) 36.7 41.1 51.4 67.8 78.0 89.1 90.7 91.4 78.6 70.0 46.8 37.0 59.8
Year Highest Occurred 1990 1987 1968 1987 1977 1988 1974 1983 1978 1963 1981 1979 1987
Lowest Mean Max. Temperature (F) 8.2 15.0 27.2 44.9 63.8 70.2 78.5 76.6 58.7 51.4 26.6 9.2 51.3
Year Lowest Occurred 1979 1979 1965 1975 1979 1969 1962 1985 1965 1969 1985 1983 1972
Mean Temperature (F) 11.0 16.9 29.6 44.8 57.1 66.8 72.5 70.3 59.6 47.6 30.8 16.3 43.6
Highest Mean Temperature (F) 25.4 31.2 37.7 52.4 65.8 74.8 76.7 77.5 66.1 57.5 36.9 26.3 48.6
Year Highest Occurred 1990 1987 1973 1987 1977 1988 1974 1983 1978 1963 1987 1979 1987
Lowest Mean Temperature (F) -1.1 4.7 17.2 38.2 51.5 59.5 67.9 65.6 49.7 43.0 18.8 1.0 41.2
Year Lowest Occurred 1982 1979 1965 1975 1967 1969 1971 1985 1965 1969 1985 1983 1979
Mean Min. Temperature (F) 0.5 6.9 19.6 33.1 44.9 54.8 60.0 57.6 47.4 36.0 21.5 6.9 32.4
Highest Mean Min. Temperature (F) 14.1 21.3 29.7 39.3 53.6 60.5 63.8 63.5 53.5 44.9 27.9 18.0 37.4
Year Highest Occurred 1990 1987 1973 1977 1977 1988 1966 1983 1978 1963 1987 1965 1987
Lowest Mean Min. Temperature (F) -12.6 -5.6 6.9 27.2 38.3 48.7 54.8 52.8 40.6 31.1 11.0 -7.2 30.1
Year Lowest Occurred 1982 1979 1969 1961 1967 1969 1971 1967 1965 1988 1985 1983 1985
Mean Precipitation (in.) 0.54 0.58 1.41 2.18 3.03 3.53 3.05 2.72 1.97 1.87 0.85 0.50 22.23
Highest Precipitation (in.) 2.11 1.86 3.94 5.45 8.75 8.30 10.36 5.24 5.66 8.10 3.11 2.40 40.04
Year Highest Occurred 1979 1977 1977 1986 1962 1977 1963 1964 1977 1971 1983 1968 1977
Lowest Precipitation (in.) 0.02 0.01 0.15 0.43 0.41 0.65 0.51 0.62 0.22 0.03 0.02 0.00 10.82
Year Lowest Occurred 1990 1968 1971 1980 1967 1988 1976 1962 1974 1986 1990 1986 1976
Heating Degree Days (F) 1674. 1347. 1097. 606. 272. 65. 13. 30. 196. 539. 1026. 1510. 8375.
Cooling Degree Days (F) 0. 0. 0. 0. 27. 119. 246. 194. 34. 0. 0. 0. 620.

Western Regional Climate Center, wrcc@dri.edu