WASHINGTON DC 3 SSW, VIRGINIA

NCDC 1961-1990 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Mean Max. Temperature (F) 41.7 44.9 55.3 65.2 74.6 82.6 86.4 84.8 78.6 68.0 57.5 46.3 65.5
Highest Mean Max. Temperature (F) 51.5 55.7 63.5 71.1 80.9 85.8 91.8 89.7 85.1 75.6 63.5 56.5 68.7
Year Highest Occurred 1990 1990 1977 1985 1965 1986 1966 1983 1961 1963 1990 1984 1990
Lowest Mean Max. Temperature (F) 31.3 34.0 48.3 59.7 69.4 76.6 82.0 81.7 71.8 60.2 49.7 36.0 63.0
Year Lowest Occurred 1977 1979 1984 1966 1967 1974 1978 1982 1975 1976 1976 1989 1978
Mean Temperature (F) 30.1 33.0 42.4 51.8 61.2 69.3 73.6 72.0 65.4 53.9 44.9 34.2 52.7
Highest Mean Temperature (F) 39.9 41.7 49.3 56.0 66.5 71.8 76.8 75.5 71.5 60.6 50.5 42.2 55.0
Year Highest Occurred 1974 1990 1977 1985 1965 1987 1987 1983 1961 1984 1985 1984 1990
Lowest Mean Temperature (F) 20.9 23.5 36.7 47.9 55.9 66.1 69.8 69.3 61.6 48.3 37.3 21.7 51.3
Year Lowest Occurred 1977 1979 1969 1975 1967 1974 1962 1982 1967 1988 1976 1989 1978
Mean Min. Temperature (F) 18.5 21.0 29.5 38.5 47.7 56.1 60.6 59.1 52.1 39.7 32.1 22.1 39.8
Highest Mean Min. Temperature (F) 29.6 27.8 35.0 43.0 53.2 59.7 63.0 63.0 57.8 50.7 39.9 29.9 41.9
Year Highest Occurred 1974 1984 1977 1980 1962 1989 1980 1980 1961 1971 1985 1972 1973
Lowest Mean Min. Temperature (F) 10.4 12.9 21.6 34.5 42.3 53.5 56.8 55.4 47.4 32.3 24.9 7.4 37.4
Year Lowest Occurred 1977 1979 1969 1971 1967 1967 1962 1971 1968 1988 1976 1989 1968
Mean Precipitation (in.) 2.35 2.61 3.01 3.33 4.33 3.68 4.06 4.34 3.71 3.90 3.70 2.76 41.78
Highest Precipitation (in.) 6.04 8.30 6.70 8.73 7.92 7.58 7.37 10.86 9.78 13.79 14.35 5.95 58.41
Year Highest Occurred 1979 1984 1984 1983 1989 1972 1969 1979 1966 1976 1985 1983 1979
Lowest Precipitation (in.) 0.23 0.06 0.74 0.87 0.93 1.14 0.91 1.25 0.81 0.00 0.66 0.15 28.17
Year Lowest Occurred 1981 1968 1971 1967 1977 1965 1966 1966 1961 1963 1981 1965 1963
Heating Degree Days (F) 1082. 896. 701. 396. 152. 9. 0. 0. 66. 353. 603. 955. 5213.
Cooling Degree Days (F) 0. 0. 0. 0. 34. 138. 267. 220. 78. 9. 0. 0. 746.

Southeast Regional Climate Center, sercc@climate.ncsu.edu