VIENNA TYSONS CORNER, VIRGINIA

Monthly Total Precipitation (inches)

(448737)

File last updated on May 16,
*** Note *** Provisional Data *** After Year/Month 201205
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
1925 0.00 z 0.00 z 0.00 z 2.98 1.47 5.46 3.95 4.37 0.33 4.09 3.10 1.56 27.31
1926 3.72 3.96 1.99 1.46 3.63 1.78 3.34 5.96 6.89 3.15 5.44 3.60 44.92
1927 1.30 3.72 1.72 4.73 2.01 3.24 2.65 2.93 0.97 7.05 2.58 3.44 36.34
1928 2.94 2.93 2.18 5.10 3.86 3.91 2.04 9.69 4.34 1.02 1.78 1.87 41.66
1929 2.85 3.17 2.68 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 8.70
1930 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1931 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1932 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1933 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1934 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1935 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1936 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1937 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1938 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1939 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1940 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1941 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1942 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 4.06 7.53 3.82 9.70 k 3.35 c 3.82 22.58
1943 2.52 1.68 4.32 3.80 6.52 2.83 3.29 1.66 2.31 3.68 4.09 l 1.83 34.44
1944 3.29 2.74 5.69 3.41 1.18 3.27 1.98 5.87 6.26 4.08 3.14 4.10 45.01
1945 3.13 3.21 0.79 2.71 3.43 4.87 12.35 3.77 5.37 1.50 4.50 4.22 49.85
1946 1.87 2.70 2.46 1.88 9.16 2.23 4.19 3.24 2.02 3.08 1.02 2.07 35.92
1947 3.94 1.28 1.41 1.84 6.11 3.10 5.62 4.78 3.48 1.57 4.47 1.38 38.98
1948 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 7.76 3.66 4.52 6.87 5.49 28.30
1949 5.22 3.20 0.00 z 0.00 z 0.00 z 2.24 j 6.49 a 3.75 3.16 3.78 0.75 2.19 28.54
1950 2.05 3.24 4.16 1.26 6.55 4.58 5.44 4.20 6.49 3.91 2.46 3.96 48.30
1951 2.39 2.58 3.86 3.83 2.65 7.72 2.09 1.75 3.14 1.23 5.74 4.16 41.14
1952 4.18 1.75 4.49 7.87 6.03 1.91 5.67 5.18 5.00 0.97 6.95 3.46 53.46
1953 3.39 a 2.03 5.67 4.57 6.71 3.25 3.74 1.78 3.84 3.04 2.08 3.81 43.91
1954 2.92 0.90 3.88 3.29 3.91 1.96 1.82 6.03 0.98 3.62 1.76 3.05 34.12
1955 0.21 3.10 4.04 2.57 2.54 5.33 1.79 14.89 0.86 4.32 1.76 0.32 41.73
1956 2.09 2.74 4.21 2.45 1.86 3.99 11.93 2.86 6.02 3.54 2.35 2.83 46.87
1957 2.95 2.91 2.45 3.56 2.30 2.93 0.61 2.15 6.21 3.21 3.11 5.86 38.25
1958 3.32 3.77 5.77 4.09 2.74 3.81 7.95 6.53 1.42 2.29 1.70 1.85 45.24
1959 2.42 1.54 2.51 4.57 2.55 3.57 3.85 3.77 2.96 3.83 2.72 2.23 36.52
1960 2.70 3.94 2.52 3.42 5.32 3.15 4.93 3.88 4.76 2.13 1.38 2.48 40.61
1961 3.15 4.97 3.75 4.21 3.34 5.99 4.17 6.83 2.55 3.16 2.30 3.33 47.75
1962 1.78 3.76 4.25 3.15 3.86 3.85 1.80 0.80 3.55 0.81 6.11 3.34 37.06
1963 1.88 1.84 4.88 1.15 1.97 10.06 0.73 4.58 3.33 0.02 8.70 2.10 41.24
1964 4.52 4.34 2.65 5.03 2.47 1.80 2.29 2.25 3.96 2.08 1.52 2.98 35.89
1965 3.32 2.45 4.86 2.22 2.27 1.73 3.40 4.50 2.32 3.42 0.61 0.37 31.47
1966 4.39 3.74 0.92 3.74 4.74 1.83 1.90 1.53 11.30 4.32 1.73 3.32 43.46
1967 1.03 2.13 4.30 1.17 4.52 1.02 2.46 12.12 0.69 3.00 2.50 5.67 40.61
1968 2.33 0.63 3.87 1.47 6.05 5.47 1.74 4.92 5.89 2.67 4.27 2.28 41.59
1969 2.17 2.29 2.27 1.75 1.72 6.01 10.82 5.98 3.06 1.14 2.74 6.67 46.62
1970 1.27 2.96 2.93 4.37 2.04 3.73 5.48 2.23 1.02 2.80 5.47 3.45 37.75
1971 2.84 5.55 2.48 2.50 8.76 2.03 5.44 6.53 4.60 5.97 3.75 1.34 51.79
1972 2.30 6.31 2.60 5.70 4.60 15.14 2.26 2.00 1.50 4.80 6.95 5.47 59.63
1973 2.61 2.84 3.62 6.47 4.73 2.35 6.22 4.69 2.83 2.09 1.25 6.47 46.17
1974 3.41 1.00 4.24 1.92 3.91 5.09 2.28 6.83 5.79 1.54 1.62 3.40 a 41.03
1975 3.06 2.17 4.86 2.72 5.92 3.30 7.27 4.05 10.92 2.45 2.70 4.70 54.12
1976 3.24 1.59 3.24 1.90 3.90 2.85 5.47 3.10 6.73 7.94 0.80 1.66 42.42
1977 1.25 0.42 3.57 2.82 2.90 3.82 3.61 3.39 1.88 5.08 5.69 4.45 38.88
1978 7.21 0.38 3.83 1.45 5.71 3.37 5.72 6.32 1.08 1.43 2.77 3.91 43.18
1979 7.40 5.57 3.31 2.46 3.47 4.33 5.04 6.34 8.98 7.06 2.91 0.82 57.69
1980 2.74 1.11 5.50 5.10 4.25 2.03 5.22 2.73 2.75 2.98 3.21 0.69 38.31
1981 0.44 3.42 1.22 2.62 4.77 4.37 6.30 5.83 2.50 4.14 0.43 2.58 38.62
1982 2.70 4.34 3.15 3.43 3.49 5.14 3.62 5.37 3.85 2.36 3.60 2.28 43.33
1983 1.54 3.16 5.11 7.56 4.54 8.11 2.36 1.69 3.80 6.03 5.03 5.62 54.55
1984 1.41 3.91 6.25 4.53 4.64 1.89 6.10 6.19 2.56 2.98 3.87 1.31 45.64
1985 2.08 3.65 2.38 0.42 6.35 2.76 2.83 2.03 5.68 4.09 5.76 0.77 38.80
1986 3.37 a 3.43 0.78 2.90 1.21 1.47 4.72 6.12 0.96 1.91 5.55 5.56 37.98
1987 4.48 1.98 1.86 4.09 3.09 5.49 1.38 1.36 6.51 3.08 4.79 2.79 40.90
1988 2.69 2.27 2.67 2.36 6.10 1.48 3.92 2.90 2.09 1.80 5.32 1.16 34.76
1989 3.22 3.06 4.76 3.41 10.48 4.25 4.84 0.38 2.52 5.72 2.17 2.05 46.86
1990 3.37 1.56 3.44 5.13 4.74 2.20 5.93 8.25 1.35 7.19 2.96 5.19 51.31
1991 3.27 0.78 5.46 1.70 2.32 2.94 5.98 1.47 3.31 3.00 1.97 5.30 37.50
1992 2.75 a 2.19 3.49 3.71 4.28 1.92 6.86 2.96 6.45 1.68 4.37 4.61 45.27
1993 3.39 2.50 9.05 4.70 5.37 1.79 2.48 5.65 4.93 2.69 5.93 4.45 52.93
1994 4.64 4.16 8.48 1.88 2.00 3.76 7.05 7.26 4.19 1.46 2.64 1.54 49.06
1995 4.27 1.73 1.41 1.19 5.56 4.15 3.97 a 1.98 2.95 a 6.11 4.98 1.75 a 40.05
1996 4.63 c 0.63 h 3.94 3.23 7.11 2.67 6.04 4.29 10.61 b 5.25 4.00 a 5.91 57.68
1997 2.83 a 2.22 4.84 2.96 5.38 2.25 1.25 c 2.47 5.03 3.12 a 6.05 2.37 40.77
1998 6.13 7.16 6.11 4.44 4.35 6.15 1.55 2.06 c 2.03 1.22 0.74 2.01 43.95
1999 5.79 2.85 4.13 2.28 1.57 2.38 1.19 4.42 11.15 2.14 2.11 a 3.01 43.02
2000 3.19 2.34 3.35 5.41 2.34 3.90 2.95 3.15 5.10 0.04 0.77 2.20 a 34.74
2001 2.90 2.11 5.57 1.92 5.93 6.09 4.41 7.22 2.27 0.94 0.85 1.78 b 41.99
2002 1.59 0.50 3.72 4.85 2.75 4.31 2.17 3.10 2.47 5.70 4.97 4.06 40.19
2003 2.55 a 6.30 4.13 3.10 7.07 7.35 7.30 3.88 7.11 4.26 5.42 5.83 64.30
2004 2.13 2.40 2.23 5.13 g 2.41 5.28 5.59 a 3.14 5.89 1.07 b 4.50 2.99 37.63
2005 3.25 1.59 5.36 a 3.18 d 6.32 e 2.73 a 6.22 3.10 a 0.19 9.03 2.26 3.18 b 46.41
2006 2.90 0.00 z 0.13 3.26 a 1.82 b 11.41 3.15 1.12 5.87 4.54 6.52 1.62 42.34
2007 2.71 2.82 3.09 0.00 z 0.74 a 2.45 2.16 2.25 a 1.75 3.68 1.35 3.61 26.61
2008 1.53 a 2.87 3.06 6.71 7.08 5.77 3.12 1.72 3.27 1.99 1.55 3.31 41.98
2009 3.05 a 0.34 2.36 3.95 7.74 4.76 a 2.73 2.89 1.91 a 4.33 4.54 6.82 45.42
2010 2.66 4.10 2.17 b 1.65 4.45 1.87 4.34 a 5.57 3.54 a 5.34 1.25 b 1.73 38.67
2011 2.22 a 1.92 a 4.78 a 4.50 4.02 a 2.22 a 2.70 5.33 b 9.26 4.09 a 1.84 a 3.39 a 46.27
2012 2.79 0.97 1.99 a 1.45 a 0.84 t 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 7.20
Period of Record Statistics
MEAN 2.98 2.76 3.60 3.33 4.25 3.97 4.22 4.34 4.06 3.36 3.35 3.20 43.46
S.D. 1.32 1.44 1.65 1.57 2.06 2.40 2.39 2.55 2.61 1.88 1.92 1.61 6.41
SKEW 1.03 0.70 0.62 0.67 0.60 2.13 1.17 1.38 1.00 0.67 0.50 0.38 0.91
MAX 7.40 7.16 9.05 7.87 10.48 15.14 12.35 14.89 11.30 9.03 8.70 6.82 64.30
MIN 0.21 0.34 0.13 0.42 0.74 1.02 0.61 0.38 0.19 0.02 0.43 0.32 31.47
NO YRS 73 71 72 70 71 71 73 74 74 73 73 74 65