WASHINGTON DC 3 SSW, VIRGINIA

Monthly Average Temperature (Degrees Fahrenheit)

(448902)

File last updated on May 16,
*** Note *** Provisional Data *** After Year/Month 199501
a = 1 day missing, b = 2 days missing, c = 3 days, ..etc..,
z = 26 or more days missing, A = Accumulations present
Long-term means based on columns; thus, the monthly row may not
sum (or average) to the long-term annual value.
MAXIMUM ALLOWABLE NUMBER OF MISSING DAYS : 5
Individual Months not used for annual or monthly statistics if more than 5 days are missing.
Individual Years not used for annual statistics if any month in that year has more than 5 days missing.
YEAR(S) JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANN
1944 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1945 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1946 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1947 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1948 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1949 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1950 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1951 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1952 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1953 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1954 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1955 ----- z 37.50 h 47.53 57.95 65.08 66.78 78.42 75.73 66.67 56.44 45.04 q 29.06 f 64.32
1956 32.24 37.72 40.10 50.73 61.42 70.20 73.84 72.34 64.05 57.23 44.12 42.17 a 53.85
1957 29.97 38.16 42.84 55.85 63.84 71.40 73.13 71.89 68.22 51.58 45.67 37.53 54.17
1958 31.23 30.52 d 39.00 52.63 60.82 66.67 74.48 71.55 65.72 54.97 46.73 28.15 51.87
1959 30.73 33.84 40.81 54.71 d 64.68 70.70 74.29 75.63 67.47 57.66 41.95 37.44 54.16
1960 34.87 34.26 31.61 55.52 59.13 69.38 71.47 74.29 66.73 54.92 44.37 25.78 a 51.86
1961 26.48 35.55 44.73 48.13 58.65 68.77 73.90 73.18 71.47 56.27 47.70 33.29 53.18
1962 32.08 32.04 40.32 52.08 66.10 69.33 69.76 70.87 62.95 56.94 41.23 29.18 51.91
1963 27.98 27.25 45.16 54.26 a 60.23 68.35 72.71 71.44 62.62 b 57.34 47.08 28.44 51.90
1964 32.13 31.98 a 43.77 50.55 63.19 67.20 j 74.27 70.10 64.67 ----- z ----- z ----- z 53.83
1965 ----- z ----- z ----- z 50.73 66.53 67.82 73.53 72.19 68.15 53.24 45.15 37.55 59.43
1966 28.34 33.62 c 43.48 48.62 60.18 69.90 75.56 73.69 64.37 52.10 44.18 33.37 52.28
1967 36.26 28.52 42.16 53.82 55.82 68.93 72.39 70.45 61.57 52.90 40.45 36.44 51.64
1968 27.56 31.45 42.80 f ----- z 57.47 69.25 73.68 73.87 64.52 54.08 43.18 28.97 52.40
1969 26.92 31.95 36.93 b 52.52 62.07 a 71.27 74.47 71.19 64.62 52.29 43.50 34.52 51.85
1970 30.53 ----- z 38.48 51.90 63.92 69.23 73.62 b 72.32 67.62 55.79 44.33 a 37.00 a 54.98
1971 27.42 33.11 a 39.42 50.25 59.25 a 70.68 72.16 69.56 68.17 a 60.34 44.68 40.71 52.98
1972 34.24 30.38 41.63 52.02 60.44 66.40 73.92 71.02 ----- z 50.95 41.35 39.30 a 51.06
1973 33.50 32.16 46.80 a 51.70 58.21 71.43 73.55 73.29 68.33 a 57.83 g ----- z 35.21 54.42
1974 39.67 b 32.66 c 43.65 52.75 f 60.40 a 66.08 72.26 71.77 64.48 51.61 45.42 36.90 53.17
1975 33.94 f 35.21 39.18 50.50 l 63.35 a 70.25 71.95 73.60 62.32 57.06 47.87 34.89 55.57
1976 29.34 40.84 45.40 53.90 58.77 70.24 a 71.69 69.37 63.16 a 49.42 a 37.32 29.48 51.58
1977 20.84 32.24 a 49.09 h 54.97 62.97 67.18 75.26 72.42 67.82 51.38 c 45.45 32.46 d 53.00
1978 25.08 25.95 39.25 c 51.38 59.63 69.38 70.68 73.19 65.90 51.28 a ----- z ----- z 53.17
1979 ----- z ----- z ----- z 56.13 o 62.62 c 66.60 a 71.81 71.89 q 65.23 51.12 j 46.06 n ----- z 66.57
1980 33.15 e 30.80 d 41.10 a 54.92 d 63.22 b 69.25 l 76.16 f 75.24 d 69.28 g 52.80 c 44.38 m 31.91 n 50.18
1981 32.11 v ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1982 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1983 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1984 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1985 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1986 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1987 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1988 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1989 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1990 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1991 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1992 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1993 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1994 25.08 a 35.32 42.50 58.07 59.03 73.65 75.71 71.40 64.90 52.88 k 57.18 s 43.00 l 56.19
1995 35.38 r ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
Period of Record Statistics
MEAN 30.25 32.85 41.56 52.92 61.37 69.20 73.40 72.37 65.67 54.29 44.09 34.23 52.56
S.D. 4.19 3.42 3.52 2.63 2.74 1.89 1.79 1.74 2.37 2.81 2.63 4.51 0.98
SKEW 0.02 0.23 -0.69 0.21 0.08 0.12 0.48 0.26 0.33 0.22 -0.76 -0.19 0.63
MAX 39.67 40.84 47.53 58.07 66.53 73.65 78.42 75.73 71.47 60.34 47.87 42.17 54.17
MIN 20.84 25.95 31.61 48.13 55.82 66.08 69.76 69.37 61.57 49.42 37.32 25.78 51.58
NO YRS 23 23 23 23 27 25 26 26 25 23 20 21 13