Dulles Average Temperatures *** PLEASE NOTE *** Climate data on this page are PRELIMINARY (unofficial). CERTIFIED (official) climate data are available from the National Climatic Data Center (NCDC) - http://www.ncdc.noaa.gov/ *** PLEASE NOTE *** YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL WINTER SPRING SUMMER AUTUMN 1ST HALF 2ND HALF 1963 28.4 29.3 46.1 53.4 60.1 70.3 76.4 74.3 65.4 59.3 48.6 29.4 53.4 m 53.2 73.7 57.8 47.9 58.9 1964 33.4 30.9 43.1 50.6 64.6 73.3 76.3 72.2 66.7 51.9 47.5 38.9 54.1 31.2 52.8 73.9 55.4 49.3 58.9 1965 30.7 35.3 39.2 51.3 66.9 70.1 74.9 75.0 70.4 54.0 45.2 39.4 54.4 35.0 52.5 73.3 56.5 48.9 59.8 1966 28.4 31.7 43.3 48.6 60.8 71.5 76.5 74.0 63.6 51.8 44.9 33.0 52.3 33.2 50.9 74.0 53.4 47.4 57.3 1967 36.6 29.1 42.8 54.8 55.9 71.4 74.5 72.8 63.6 53.7 40.6 36.5 52.7 32.9 51.2 72.9 52.6 48.4 57.0 1968 28.2 30.8 46.2 53.1 58.6 70.0 75.6 75.6 66.8 56.4 46.1 31.9 53.3 31.8 52.6 73.7 56.4 47.8 58.7 1969 29.4 32.2 38.7 55.3 64.3 73.6 77.8 71.9 65.3 52.8 41.9 31.0 52.9 31.2 52.8 74.4 53.3 48.9 56.8 1970 23.9 32.7 37.8 52.5 63.5 68.9 74.0 72.2 69.1 56.3 45.7 36.3 52.8 29.2 51.3 71.7 57.0 46.6 58.9 1971 28.5 36.7 39.7 51.4 60.1 72.6 74.9 72.9 69.7 61.4 44.4 42.2 54.5 33.8 50.4 73.5 58.5 48.2 60.9 1972 35.8 32.6 42.8 51.3 61.8 67.4 75.9 73.3 68.0 51.5 42.0 39.3 53.5 36.9 52.0 72.2 53.8 48.6 58.3 1973 33.6 33.1 48.6 53.1 59.8 74.2 75.9 76.4 69.6 56.9 46.0 35.2 55.2 35.3 53.8 75.5 57.5 50.4 60.0 1974 37.8 32.5 44.6 54.3 61.1 67.1 73.5 74.4 66.3 53.3 46.1 36.6 54.0 35.2 53.3 71.7 55.2 49.6 58.4 1975 34.0 35.0 40.3 49.1 65.2 70.9 74.4 75.5 64.4 57.0 47.2 33.2 53.9 35.2 51.5 73.6 56.2 49.1 58.6 1976 27.5 41.1 44.6 52.9 58.1 70.5 72.2 71.5 64.8 50.5 38.3 31.2 51.9 33.9 51.9 71.4 51.2 49.1 54.8 1977 21.0 34.8 48.9 55.4 64.5 68.3 76.4 76.3 69.9 53.9 47.9 33.0 54.2 29.0 56.3 73.7 57.2 48.8 59.6 1978 27.3 26.7 40.6 54.2 63.4 71.6 74.4 77.2 68.9 53.5 46.8 38.2 53.6 29.0 52.7 74.4 56.4 47.3 59.8 1979 31.2 23.3 46.4 52.2 63.3 68.2 74.2 74.4 66.9 54.6 49.7 40.1 53.7 30.9 54.0 72.3 57.1 47.4 60.0 1980 32.7 31.0 41.9 55.6 65.8 69.2 77.3 77.1 70.8 54.1 42.7 34.9 54.4 34.6 54.4 74.5 55.9 49.4 59.5 1981 27.8 38.5 41.4 57.0 60.9 73.5 75.1 71.9 66.7 52.5 45.9 34.1 53.8 33.7 53.1 73.5 55.0 49.9 57.7 1982 26.2 36.5 43.7 51.3 66.8 70.8 77.0 72.3 66.9 57.3 48.4 42.6 55.0 32.3 53.9 73.4 57.5 49.2 60.8 1983 34.7 35.0 46.0 50.2 59.4 70.0 74.6 75.3 66.2 54.7 44.7 30.4 53.4 37.4 51.9 73.3 55.2 49.2 57.7 1984 25.8 38.9 37.5 50.9 59.8 71.2 72.0 74.2 63.0 61.8 42.6 44.1 54.9 31.7 49.4 72.5 55.8 47.4 59.6 1985 28.1 35.8 45.0 57.1 63.8 69.7 75.9 73.4 67.7 58.4 52.6 33.2 55.1 36.0 55.3 73.0 59.6 49.9 60.2 1986 32.5 32.1 44.3 53.6 64.2 73.4 79.0 72.5 68.2 56.8 43.2 36.8 54.7 32.6 54.0 75.0 56.1 50.0 59.4 1987 31.2 33.1 43.5 51.7 64.3 73.7 79.1 75.4 68.7 49.9 47.8 38.6 54.8 33.7 53.2 76.1 55.5 49.6 59.9 1988 27.6 34.5 43.9 52.2 63.5 70.9 78.7 78.4 66.4 49.2 46.0 35.8 53.9 33.6 53.2 76.0 53.9 48.8 59.1 1989 36.3 35.2 43.7 51.7 61.4 73.8 76.0 74.4 68.6 57.3 43.7 23.1 53.8 35.8 52.3 74.7 56.5 50.4 57.2 1990 40.8 42.2 48.1 54.3 61.6 72.0 76.9 73.8 66.1 58.7 48.6 41.3 57.0 35.4 54.7 74.2 57.8 53.2 60.9 1991 34.0 39.5 46.1 56.0 69.3 72.3 77.9 77.0 67.6 56.6 45.7 38.5 56.7 38.3 57.1 75.7 56.6 52.9 60.6 1992 35.0 38.0 41.9 53.1 59.7 68.6 75.9 70.4 66.0 52.2 45.7 36.8 53.6 37.2 51.6 71.6 54.6 49.4 57.8 1993 36.8 31.7 39.3 52.6 64.5 72.0 79.7 78.0 68.7 54.2 45.3 34.0 54.7 35.1 52.1 76.6 56.1 49.5 60.0 1994 26.1 33.3 42.7 60.1 59.9 76.1 79.5 73.8 66.7 53.9 49.1 40.3 55.1 31.1 54.2 76.5 56.6 49.7 60.6 1995 37.2 31.3 46.1 52.6 62.7 71.5 78.2 77.6 67.1 58.3 39.7 33.0 54.6 36.3 53.8 75.8 55.0 50.2 59.0 1996 30.0 34.7 39.7 54.6 59.7 72.8 72.9 72.7 67.1 55.7 39.3 38.3 53.1 32.6 51.3 72.8 54.0 48.6 57.7 1997 32.5 40.5 44.6 50.3 58.8 69.1 75.8 73.3 65.1 53.7 43.6 37.2 53.7 37.1 51.2 72.7 54.1 49.3 58.1 1998 40.1 41.0 45.5 54.9 65.9 70.4 75.3 76.2 72.7 56.2 45.5 40.9 57.1 39.4 55.4 74.0 58.1 53.0 61.1 1999 35.0 37.5 41.4 53.0 62.8 70.8 78.5 75.4 67.0 53.1 50.1 38.2 55.2 37.8 52.4 74.9 56.7 50.1 60.4 2000 32.5 39.2 47.9 53.3 64.6 72.2 71.8 72.8 65.0 57.0 42.5 27.8 53.9 36.6 55.3 72.3 54.8 51.6 56.2 2001 32.1 38.5 40.5 55.5 62.6 72.4 72.2 76.5 65.4 55.8 50.7 41.3 55.3 32.8 52.9 73.7 57.3 50.3 60.3 2002 39.1 38.9 45.4 56.8 61.9 72.6 77.3 78.1 69.1 55.0 44.1 33.4 56.0 39.8 54.7 76.0 56.1 52.5 59.5 2003 28.4 30.3 44.1 53.5 59.8 69.3 75.4 76.2 67.1 53.8 50.0 36.0 53.7 30.7 52.5 73.6 57.0 47.6 59.8 2004 28.0 34.8 46.3 54.8 69.8 70.9 75.9 73.6 68.8 55.6 48.4 37.8 55.4 32.9 57.0 73.5 57.6 50.8 60.0 2005 34.8 37.4 40.9 55.3 59.7 73.7 77.9 77.7 71.9 58.8 47.8 33.4 55.8 36.7 52.0 76.4 59.5 50.3 61.3 2006 41.8 36.0 45.9 57.4 62.8 72.6 78.6 78.1 65.6 54.9 48.6 41.9 57.0 37.1 55.4 76.4 56.4 52.8 61.3 2007 39.1 28.6 46.4 52.2 66.1 74.4 77.3 78.7 71.2 63.6 46.1 38.4 56.8 36.5 54.9 76.8 60.3 51.1 62.6 2008 35.5 37.3 45.9 56.0 61.1 74.4 76.8 73.8 69.4 55.2 44.3 38.3 55.7 37.1 54.3 75.0 56.3 51.7 59.6 2009 29.6 38.0 43.7 55.9 65.0 73.1 74.9 78.4 68.4 56.4 49.9 35.2 55.7 35.3 54.9 75.5 58.2 50.9 60.5 2010 33.4 30.9 49.5 59.3 67.0 76.8 79.5 77.0 71.3 58.0 46.2 30.9 56.7 33.2 58.6 77.8 58.5 52.8 60.5 2011 30.0 38.1 44.2 57.3 66.3 74.9 81.0 76.3 69.1 55.1 49.1 41.5 56.9 34.1 55.9 77.4 57.8 51.8 62.0 2012 37.8 41.0 54.3 54.1 68.5 71.9 80.6 77.1 68.1 56.8 42.5 59.3 40.1 59.0 76.5 55.8 54.6 65.0 NORM 33.2 36.2 44.2 54.4 63.2 72.4 76.7 75.4 67.9 56.0 46.4 36.6 55.3 35.3 53.9 74.9 56.7 50.6 59.8 1981-2010 YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL WINTER SPRING SUMMER AUTUMN 1ST HALF 2ND HALF