KNOXVILLE WSO AIRPORT, TENNESSEE

Monthly Total Precipitation (inches)

(404950)

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
1910 2.15 3.27 b 0.72 4.12 7.28 3.13 5.09 3.86 3.68 1.68 0.97 4.94 40.89
1911 4.79 4.83 3.99 7.66 1.23 2.72 4.31 2.99 1.89 3.78 4.37 4.84 47.40
1912 3.00 S 2.96 7.04 7.98 5.94 2.44 4.32 2.66 5.08 1.30 1.47 6.33 50.52
1913 8.93 4.51 6.43 2.00 4.86 1.56 3.77 1.44 3.34 2.45 1.11 3.59 43.99
1914 1.64 3.47 3.97 4.50 1.25 3.91 7.11 5.69 1.04 3.57 1.29 7.86 45.30
1915 4.18 3.37 2.57 1.45 3.59 6.24 3.72 3.95 4.04 2.68 5.48 7.77 49.04
1916 5.23 3.33 2.25 2.03 4.71 5.29 6.48 4.24 2.84 1.97 2.55 3.63 44.55
1917 6.82 3.53 13.35 2.13 2.52 5.49 13.16 4.20 3.22 3.54 0.47 1.48 59.91
1918 6.62 2.37 1.43 5.41 4.51 5.10 1.85 2.41 1.59 5.19 1.99 5.32 43.79
1919 4.67 2.78 4.85 3.68 4.11 5.54 3.09 4.67 0.96 5.51 2.18 4.25 46.29
1920 2.94 4.94 4.89 7.22 2.31 7.18 2.19 11.33 2.51 0.78 3.89 5.03 55.21
1921 3.40 4.65 3.61 3.16 1.85 3.07 7.82 2.86 1.63 1.40 4.74 2.26 40.45
1922 4.64 4.09 7.60 4.61 3.82 4.24 4.02 3.47 1.86 1.39 1.80 7.27 48.81
1923 5.77 4.80 7.82 5.65 4.53 4.26 5.32 2.97 1.50 0.74 1.96 3.70 49.02
1924 4.24 4.66 3.98 5.46 4.06 3.75 2.45 1.77 6.80 0.99 0.79 8.46 47.41
1925 3.77 2.56 1.10 2.30 2.40 1.78 1.46 1.63 2.48 9.51 4.34 1.83 35.16
1926 4.06 3.05 2.82 3.14 3.03 5.07 2.44 5.20 1.84 2.88 4.61 9.73 47.87
1927 2.35 7.53 3.65 3.05 2.92 3.18 3.41 4.55 0.78 1.30 2.52 5.14 40.38
1928 2.27 3.40 4.79 5.54 6.17 11.83 2.56 4.53 3.02 3.81 3.43 1.15 52.50
1929 4.34 5.69 6.69 3.46 7.66 6.29 5.39 2.12 4.39 1.33 8.55 2.73 58.64
1930 2.19 3.78 4.41 1.39 4.21 2.60 1.86 2.03 4.56 1.44 2.90 2.30 33.67
1931 1.79 2.93 2.73 4.81 3.71 1.50 7.94 3.40 1.95 1.42 1.93 7.92 42.03
1932 5.37 5.76 4.88 5.47 1.59 4.45 3.58 5.77 3.67 5.34 3.22 8.41 57.51
1933 2.82 7.11 3.30 2.56 4.45 3.29 3.08 8.72 3.50 0.39 1.17 3.33 43.72
1934 3.96 3.05 7.79 2.38 4.41 5.08 4.35 7.47 2.92 4.33 1.92 2.72 50.38
1935 3.48 4.72 7.85 5.95 4.42 4.14 4.91 2.60 0.27 3.92 7.29 1.70 51.25
1936 7.84 4.36 7.96 4.76 0.76 1.39 7.94 1.97 2.13 2.06 1.20 6.21 48.58
1937 11.63 4.51 1.61 3.04 4.38 2.52 6.33 5.70 2.11 4.08 1.06 3.29 50.26
1938 4.30 2.55 5.78 6.52 8.81 4.99 4.83 2.19 3.13 0.50 4.68 2.71 50.99
1939 3.82 10.69 4.61 a 5.00 1.03 4.83 8.37 2.12 0.94 0.38 2.21 3.18 47.18
1940 2.31 3.47 5.09 4.28 5.13 4.48 2.46 5.25 1.17 2.12 1.76 2.90 40.42
1941 2.08 0.87 4.13 4.01 0.71 3.95 8.37 3.34 0.75 2.54 2.55 2.45 35.75
1942 2.88 a 3.72 5.02 0.84 5.20 2.01 9.19 8.88 2.82 3.12 0.97 8.30 52.95
1943 2.09 4.74 5.17 3.48 2.88 3.55 9.29 1.48 3.51 3.69 2.02 1.54 43.44
1944 2.05 9.38 6.12 3.78 1.54 0.20 1.41 2.17 8.61 1.66 2.55 4.71 44.18
1945 2.18 7.03 3.29 4.56 4.73 4.33 5.46 2.14 2.88 3.57 4.00 5.48 49.65
1946 10.01 5.00 3.65 4.10 6.40 3.94 3.10 0.97 1.64 4.03 3.45 4.41 50.70
1947 9.64 2.67 3.01 2.42 3.30 2.68 3.33 1.65 g 1.28 a 1.61 3.34 2.13 35.41
1948 3.57 6.38 5.19 2.67 3.27 3.47 5.91 1.71 1.52 1.27 10.36 5.81 51.13
1949 6.81 2.86 5.06 4.04 2.57 3.22 5.52 5.07 2.38 6.67 1.51 3.03 48.74
1950 9.39 5.72 5.17 1.06 5.42 3.10 7.43 4.37 1.75 1.55 2.48 3.07 50.51
1951 5.02 4.80 7.46 5.33 1.29 5.81 4.06 1.30 4.37 2.90 4.96 5.43 52.73
1952 4.56 2.11 3.87 1.12 3.32 1.98 2.64 4.57 1.94 0.63 5.27 3.99 36.00
1953 4.12 6.22 4.22 4.23 4.50 3.02 3.74 0.88 2.93 0.68 1.65 3.36 39.55
1954 11.74 3.14 4.67 2.24 3.55 2.32 3.34 0.77 1.30 0.64 3.40 5.97 43.08
1955 1.63 5.62 5.38 3.70 3.51 3.65 3.97 1.93 2.48 3.20 3.30 2.73 41.10
1956 3.18 8.29 4.58 5.07 3.27 2.69 4.54 1.45 1.66 2.59 1.98 8.06 47.36
1957 9.63 7.86 2.26 4.56 3.53 5.86 0.70 4.07 6.98 3.43 7.45 5.16 61.49
1958 2.13 2.81 4.29 5.41 4.78 2.01 5.57 2.83 1.49 0.68 3.06 2.19 37.25
1959 4.09 4.06 4.12 4.17 3.53 2.78 2.97 4.91 0.93 5.00 4.68 4.03 45.27
1960 3.39 3.00 4.78 1.83 1.12 4.89 2.36 3.72 4.58 4.34 2.55 3.61 40.17
1961 2.55 7.82 7.80 2.50 4.18 4.54 3.49 3.04 0.50 3.41 3.04 11.64 54.51
1962 6.22 7.96 4.13 3.84 1.88 5.05 7.82 2.08 5.13 2.20 4.60 3.67 54.58
1963 4.20 3.54 9.92 3.63 4.51 3.32 4.92 3.64 2.37 0.00 5.23 2.86 48.14
1964 4.71 4.09 5.75 6.98 3.96 0.97 3.70 5.75 1.10 2.10 2.80 4.02 45.93
1965 3.94 3.25 9.31 4.16 3.13 4.84 3.49 2.18 2.48 1.08 2.50 0.45 40.81
1966 3.88 4.68 2.72 2.88 2.92 2.27 5.44 4.09 4.41 4.80 5.12 2.66 45.87
1967 2.67 4.58 4.08 2.00 4.10 6.53 10.09 4.06 2.70 2.33 5.57 6.95 55.66
1968 4.13 0.74 4.78 4.12 3.01 3.97 2.57 1.29 2.53 3.40 2.00 3.22 35.76
1969 4.11 5.54 2.89 2.41 1.33 7.58 3.51 6.72 3.03 1.56 2.56 7.74 48.98
1970 3.04 2.86 3.18 7.20 0.74 4.26 3.11 4.89 2.75 5.33 1.40 4.67 43.43
1971 5.03 4.93 4.21 3.87 3.78 3.73 8.76 3.05 3.41 1.98 2.21 5.48 50.44
1972 7.35 4.19 4.98 2.54 4.49 5.02 6.76 1.61 4.70 5.99 3.36 7.02 58.01
1973 3.24 2.59 10.24 5.15 5.71 5.26 4.38 2.31 3.28 3.48 5.01 7.38 58.03
1974 7.05 5.24 6.15 5.77 10.98 2.70 2.92 3.14 3.33 2.35 5.18 4.52 59.33
1975 4.66 4.68 10.42 2.43 2.98 2.43 2.25 1.61 3.28 4.02 2.92 3.59 45.27
1976 3.86 2.18 5.22 0.39 5.53 3.46 3.75 1.98 2.87 5.33 3.45 4.42 42.44
1977 2.55 1.52 6.08 6.96 1.16 6.49 1.08 5.78 6.91 4.04 5.06 3.30 50.93
1978 5.22 1.01 4.42 4.10 3.44 5.27 5.06 2.44 1.26 0.82 3.62 5.91 42.57
1979 6.18 4.17 4.21 4.30 7.21 3.80 9.47 2.29 2.64 1.97 5.73 1.92 53.89
1980 5.54 1.78 8.72 3.30 3.80 1.94 3.57 2.34 2.38 1.53 3.78 1.78 40.46
1981 1.05 3.62 2.83 4.84 3.02 5.53 2.03 3.48 6.09 4.15 3.01 4.14 43.79
1982 6.03 4.88 6.36 3.26 5.52 3.93 6.60 2.68 2.68 2.66 5.21 4.89 54.70
1983 1.58 2.90 1.99 5.88 5.42 3.26 3.18 3.89 0.95 3.34 4.40 5.69 42.48
1984 2.26 4.42 3.79 3.37 10.14 4.34 9.03 1.72 0.85 3.26 2.87 2.49 48.54
1985 3.17 4.11 1.98 2.86 1.60 4.77 2.63 4.07 0.42 3.04 5.39 2.36 36.40
1986 0.95 3.90 1.69 2.25 2.40 0.69 1.89 3.37 3.59 3.84 3.83 4.08 32.48
1987 4.68 4.63 2.91 2.18 4.62 2.66 4.67 1.08 1.93 0.60 1.21 3.49 34.66
1988 4.29 2.94 2.42 2.34 2.35 0.51 3.60 3.20 2.68 1.52 4.82 3.99 34.66
1989 4.96 6.26 3.82 3.50 5.31 8.21 2.68 3.16 9.19 1.47 4.92 2.74 56.22
1990 5.88 6.90 5.73 2.56 4.71 1.72 7.56 3.02 2.68 3.64 1.77 8.99 55.16
1991 2.53 6.99 6.36 3.97 3.10 6.02 3.45 6.13 3.14 1.10 5.24 10.23 58.26
1992 3.87 3.36 3.99 2.11 3.20 3.07 4.62 4.22 1.77 3.05 4.29 6.68 44.23
1993 4.09 2.20 6.16 2.50 3.78 0.90 2.03 6.04 4.77 2.25 3.33 7.04 45.09
1994 7.08 8.81 11.81 7.90 3.04 5.97 5.94 4.19 1.20 2.38 2.93 2.02 63.27
1995 4.90 4.54 3.54 1.74 7.05 3.90 0.33 2.08 2.46 3.58 6.21 2.50 42.83
1996 7.53 2.74 4.72 4.50 4.57 2.96 4.77 1.33 3.45 1.17 7.71 5.44 50.89
1997 5.20 5.17 6.34 3.82 6.76 5.70 3.75 2.02 3.32 2.90 2.78 2.37 50.13
1998 4.62 2.71 4.75 11.07 3.84 7.96 5.69 2.07 1.31 1.42 2.51 5.95 53.90
1999 6.62 3.50 4.85 3.40 4.92 5.58 12.66 0.85 0.82 2.84 2.40 1.70 50.14
2000 5.14 3.42 4.37 6.69 5.90 3.36 6.12 1.40 3.82 0.00 4.35 2.45 47.02
2001 4.74 6.46 2.63 2.82 3.46 3.88 4.14 3.74 3.56 0.86 1.55 4.66 42.50
2002 8.06 1.69 10.59 1.44 4.66 3.91 5.65 1.41 5.17 5.43 a 4.58 5.35 57.94
2003 3.17 8.69 2.07 5.95 8.09 2.45 8.27 5.48 5.14 1.24 4.71 3.40 58.66
2004 2.74 3.64 b 4.61 2.73 5.35 7.90 7.62 2.18 4.75 3.10 6.01 5.56 56.19
2005 2.33 3.77 3.47 4.76 3.18 3.09 4.98 3.77 1.74 1.08 3.43 2.83 38.43
2006 4.00 2.55 3.22 7.57 2.13 2.38 3.94 6.39 6.17 4.11 3.24 2.09 47.79
2007 2.12 1.54 2.62 5.05 1.48 1.34 4.71 4.13 1.49 1.23 3.98 4.20 33.89
2008 3.13 4.81 4.33 3.74 3.39 2.19 7.04 1.91 3.16 1.66 3.41 8.98 47.75
2009 6.60 2.73 3.50 2.90 8.10 4.85 6.97 6.22 4.64 4.28 3.58 6.29 60.66
2010 6.21 2.78 2.88 2.51 4.22 1.25 5.89 2.80 4.34 3.99 6.73 2.20 45.80
2011 3.42 4.09 6.36 9.06 1.64 2.99 2.49 1.06 8.74 4.76 7.08 4.91 56.60
2012 5.67 4.06 6.06 3.64 b 0.55 v 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 19.43
Period of Record Statistics
MEAN 4.51 4.28 4.88 3.99 3.98 3.90 4.80 3.40 2.98 2.68 3.55 4.51 47.53
S.D. 2.22 1.91 2.32 1.89 1.98 1.89 2.47 1.90 1.81 1.66 1.84 2.26 7.18
SKEW 1.08 0.90 1.13 0.89 0.88 0.88 0.91 1.28 1.22 0.89 0.88 0.77 -0.02
MAX 11.74 10.69 13.35 11.07 10.98 11.83 13.16 11.33 9.19 9.51 10.36 11.64 63.27
MIN 0.95 0.74 0.72 0.39 0.71 0.20 0.33 0.77 0.27 0.00 0.47 0.45 32.48
NO YRS 103 103 103 103 102 102 102 101 102 102 102 102 101