VIENNA, MARYLAND

NCDC 1971-2000 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Mean Max. Temperature (F) 45.1 47.5 56.8 66.9 75.9 84.1 88.7 86.6 80.8 70.1 59.5 49.8 67.7
Highest Mean Max. Temperature (F) 53.5 56.7 63.7 73.8 81.6 87.8 92.9 90.4 85.5 75.0 65.0 57.5 92.9
Year Highest Occurred 1999 1976 2000 1985 1986 1994 1993 1995 1998 1995 1985 1971 1993
Lowest Mean Max. Temperature (F) 34.7 34.6 51.5 61.5 72.1 76.4 83.6 83.1 78.2 63.9 53.4 36.5 34.6
Year Lowest Occurred 1977 1979 1984 1975 1972 1974 1974 1976 1975 1976 1976 1989 1979
Mean Temperature (F) 36.1 38.2 46.4 55.6 64.9 73.3 78.1 76.1 69.9 58.8 49.3 40.5 57.3
Highest Mean Temperature (F) 44.3 46.1 51.9 60.8 68.8 76.4 81.9 79.3 74.3 65.1 57.1 47.4 81.9
Year Highest Occurred 1998 1976 2000 1994 1986 1994 1993 1988 1998 1984 1985 1971 1993
Lowest Mean Temperature (F) 26.3 26.2 40.8 51.9 62.0 67.6 74.2 73.0 66.8 53.0 42.9 26.1 26.1
Year Lowest Occurred 1977 1979 1996 1975 1978 1974 1974 1982 1991 1988 1976 1989 1989
Mean Min. Temperature (F) 27.1 28.8 36.0 44.3 53.8 62.5 67.4 65.6 58.9 47.4 39.0 31.1 46.8
Highest Mean Min. Temperature (F) 35.7 35.8 42.2 48.3 57.1 67.2 70.9 69.7 63.3 56.5 49.2 37.6 70.9
Year Highest Occurred 1998 1984 1977 1994 1998 1973 1994 1978 1971 1971 1985 1984 1994
Lowest Mean Min. Temperature (F) 17.9 17.8 29.4 41.2 49.8 58.4 63.6 61.9 53.2 40.8 32.3 15.7 15.7
Year Lowest Occurred 1977 1979 1996 1991 1994 1980 1991 1982 1991 1988 1976 1989 1989
Mean Precipitation (in.) 3.74 3.33 4.07 3.33 3.52 3.72 3.86 4.37 3.52 3.14 3.12 3.28 43.00
Highest Precipitation (in.) 7.71 7.14 9.74 6.61 8.90 11.81 8.87 13.44 10.83 7.58 6.90 6.91 13.44
Year Highest Occurred 1998 1979 1994 1983 1984 1989 1996 1973 1977 1971 1997 1977 1973
Lowest Precipitation (in.) 0.53 0.85 1.34 0.78 0.66 0.45 0.38 0.70 0.52 0.08 0.27 0.34 0.08
Year Lowest Occurred 1981 2000 1977 1985 1986 1988 1983 1987 1978 2000 1991 1989 2000
Heating Degree Days (F) 896. 752. 578. 286. 75. 6. 0. 0. 17. 227. 474. 762. 4073.
Cooling Degree Days (F) 0. 0. 0. 4. 71. 255. 403. 344. 163. 33. 1. 0. 1274.

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