| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1917 | 0.00 | z | 0.00 | z | 3.89 | 3.44 | 2.05 | 0.48 | 0.00 | 0.00 | 4.50 | 0.18 | 2.11 | 6.39 | e | 23.04 | ||||||||||
| 1918 | 7.07 | e | 2.03 | m | 1.36 | 1.12 | 0.53 | 0.77 | 1.52 | 1.63 | 1.22 | 2.86 | 1.13 | 0.90 | 20.11 | |||||||||||
| 1919 | 1.32 | 1.94 | 2.19 | 2.31 | 1.46 | 0.12 | 0.00 | 0.36 | 0.30 | 2.87 | 4.52 | 2.29 | 19.68 | |||||||||||||
| 1920 | 1.61 | b | 0.22 | 3.07 | 3.79 | 2.00 | 1.51 | a | 0.07 | b | 2.64 | a | 2.59 | 3.70 | 2.14 | 2.59 | b | 25.93 | ||||||||
| 1921 | 3.42 | 3.07 | 1.96 | 2.79 | 2.74 | 0.79 | 0.18 | 0.38 | 1.69 | 1.17 | a | 5.40 | 1.68 | 25.27 | ||||||||||||
| 1922 | 1.16 | 1.99 | 2.24 | 2.51 | 1.19 | 1.11 | 0.00 | 1.02 | 0.33 | 0.98 | 0.92 | 3.57 | 17.02 | |||||||||||||
| 1923 | 3.67 | 0.80 | 1.72 | 2.85 | 3.59 | 4.99 | 0.50 | 0.59 | 0.79 | 5.04 | 2.19 | 2.09 | 28.82 | |||||||||||||
| 1924 | 2.14 | 2.65 | 1.30 | 0.59 | 0.52 | 1.60 | 1.01 | 0.94 | 0.77 | 1.39 | 4.15 | 3.48 | 20.54 | |||||||||||||
| 1925 | 3.59 | 0.81 | s | 1.87 | c | 3.33 | 3.64 | 1.78 | 0.37 | 2.62 | 1.14 | 0.37 | 1.00 | 2.84 | 22.55 | |||||||||||
| 1926 | 1.30 | 3.26 | 1.55 | 2.37 | 2.34 | 0.80 | 0.78 | 3.03 | 1.73 | a | 1.40 | y | 4.67 | 2.75 | 24.58 | |||||||||||
| 1927 | 2.32 | 2.09 | 2.08 | 1.01 | 1.63 | 2.50 | 0.11 | 0.63 | 6.62 | 2.63 | 6.01 | 1.96 | 29.59 | |||||||||||||
| 1928 | 2.86 | 0.58 | 2.99 | 3.38 | 0.26 | 0.72 | 0.93 | 0.19 | 1.59 | 1.84 | 1.45 | 0.65 | a | 17.44 | ||||||||||||
| 1929 | 3.06 | 0.73 | a | 2.14 | 1.33 | 0.73 | 3.97 | 0.00 | 1.32 | 0.36 | 1.28 | 0.39 | 2.94 | 18.25 | ||||||||||||
| 1930 | 1.79 | 3.55 | 2.13 | 2.88 | 3.29 | 1.26 | 0.26 | 0.25 | 1.28 | 3.11 | 0.81 | 1.38 | 21.99 | |||||||||||||
| 1931 | 1.26 | 1.12 | 3.43 | 1.83 | 0.59 | 2.88 | 0.00 | 0.00 | 0.99 | 2.09 | 1.47 | 1.53 | 17.19 | |||||||||||||
| 1932 | 1.64 | 1.87 | 5.19 | a | 1.85 | 2.38 | 0.70 | 0.25 | 0.26 | 0.28 | 1.14 | 3.80 | 1.38 | 20.74 | ||||||||||||
| 1933 | 1.43 | 2.61 | 1.73 | 1.41 | 3.54 | 2.26 | 0.53 | 0.90 | 1.69 | 1.18 | 1.59 | 3.89 | 22.76 | |||||||||||||
| 1934 | 2.53 | 1.19 | 3.20 | 1.55 | 1.27 | 4.84 | 0.08 | 0.00 | 0.65 | 2.31 | 2.30 | 1.52 | q | 19.92 | ||||||||||||
| 1935 | 0.66 | 0.60 | 1.11 | 3.23 | 1.05 | 1.56 | 0.46 | 0.13 | 0.00 | 1.68 | 1.31 | 1.78 | 13.57 | |||||||||||||
| 1936 | 3.65 | 2.12 | 1.68 | 2.61 | 0.96 | 2.41 | 0.62 | 0.09 | 0.85 | 0.13 | 0.09 | 2.75 | 17.96 | |||||||||||||
| 1937 | 2.19 | 1.95 | 2.68 | 3.74 | 0.82 | 3.10 | 0.17 | 0.51 | 0.35 | 2.39 | 3.05 | 2.34 | 23.29 | |||||||||||||
| 1938 | 2.01 | 2.75 | 2.06 | 2.39 | 1.91 | a | 2.60 | 0.15 | 0.08 | 1.01 | 2.44 | 3.75 | 1.46 | 22.61 | ||||||||||||
| 1939 | 1.07 | 2.73 | 0.76 | 0.55 | 1.06 | 1.73 | 0.61 | 0.00 | 1.26 | 1.82 | 0.08 | 2.76 | 14.43 | |||||||||||||
| 1940 | 1.86 | 3.28 | 3.87 | 2.87 | 0.90 | 0.66 | 0.96 | 0.00 | 4.52 | 3.21 | 2.72 | 0.66 | 25.51 | |||||||||||||
| 1941 | 1.47 | 1.92 | 0.67 | 2.40 | 4.97 | 6.64 | 1.13 | 1.81 | 2.75 | 2.85 | 2.23 | 2.58 | 31.42 | |||||||||||||
| 1942 | 2.04 | 1.89 | 1.79 | 4.21 | 5.31 | 3.11 | 0.80 | 0.94 | 0.29 | 1.51 | 4.62 | 3.23 | 29.74 | |||||||||||||
| 1943 | 2.40 | 1.88 | 2.67 | 2.96 | 2.49 | 4.27 | 0.60 | 1.15 | 0.15 | 2.30 | 1.51 | 0.87 | 23.25 | |||||||||||||
| 1944 | 0.73 | a | 1.99 | 1.86 | 3.17 | 1.10 | 4.55 | s | 0.16 | 0.32 | 1.50 | 0.59 | 2.10 | 0.71 | y | 13.52 | ||||||||||
| 1945 | 2.59 | 3.39 | 3.24 | 1.88 | 3.67 | 2.16 | 0.02 | 0.38 | 2.35 | 0.94 | 2.55 | 2.57 | 25.74 | |||||||||||||
| 1946 | 1.90 | 1.81 | 2.79 | 2.12 | 4.95 | 2.47 | 1.84 | 0.32 | 1.79 | 2.71 | 3.59 | 3.77 | 30.06 | |||||||||||||
| 1947 | 1.50 | 0.36 | 1.72 | 2.67 | 1.72 | 6.16 | 0.01 | 0.14 | 1.79 | 3.94 | 4.53 | 2.04 | 26.58 | |||||||||||||
| 1948 | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 1.50 | 0.51 | 0.42 | 1.73 | 2.42 | 2.93 | 9.51 | |||||||
| 1949 | 0.49 | 2.15 | 0.86 | 1.65 | 1.98 | 0.86 | 0.13 | 0.01 | 0.49 | 2.54 | 3.22 | 1.69 | 16.07 | |||||||||||||
| 1950 | 1.98 | 1.76 | 2.56 | 1.99 | 1.58 | 2.78 | 1.23 | 0.59 | 0.89 | 1.49 | g | 2.12 | 3.80 | 21.28 | ||||||||||||
| 1951 | 2.29 | 2.17 | 1.50 | b | 1.33 | 3.02 | 2.09 | 0.30 | 0.77 | b | 0.90 | 3.23 | a | 1.65 | 1.89 | e | 21.14 | |||||||||
| 1952 | 0.92 | 1.46 | a | 1.33 | 2.02 | 3.82 | 3.91 | 0.25 | 0.04 | 0.85 | a | 0.05 | 0.64 | 1.15 | 16.44 | |||||||||||
| 1953 | 3.69 | 3.21 | 2.29 | 3.09 | 4.96 | a | 2.59 | b | 0.00 | 1.56 | a | 0.04 | 1.36 | 2.54 | 3.39 | 28.72 | ||||||||||
| 1954 | 1.51 | 0.96 | 1.63 | 2.20 | 3.78 | 1.69 | a | 1.14 | 3.05 | 0.43 | 1.17 | 1.82 | 1.77 | 21.15 | ||||||||||||
| 1955 | 1.23 | 1.69 | 2.31 | a | 3.98 | c | 1.85 | 0.75 | 1.25 | 0.00 | 1.86 | b | 2.49 | a | 3.87 | 2.63 | 23.91 | |||||||||
| 1956 | 4.55 | 2.53 | 1.39 | 0.42 | 4.69 | 3.06 | 1.29 | 1.84 | 0.20 | 3.62 | 1.03 | 4.12 | 28.74 | |||||||||||||
| 1957 | 2.72 | 2.09 | 3.78 | 2.06 | 3.12 | 1.76 | 0.26 | a | 0.18 | 0.40 | 3.19 | 1.86 | 3.51 | 24.93 | ||||||||||||
| 1958 | 1.44 | 1.67 | 2.66 | 2.51 | 2.44 | 3.38 | 0.92 | 0.48 | 1.21 | 1.04 | 4.45 | 3.82 | 26.02 | |||||||||||||
| 1959 | 2.55 | e | 1.17 | 2.10 | 1.19 | 2.49 | 1.13 | 0.36 | 0.91 | 5.17 | 2.49 | 2.02 | 0.78 | 22.36 | ||||||||||||
| 1960 | 1.33 | 1.44 | 2.65 | 2.74 | 4.83 | 0.42 | 0.91 | 2.58 | 0.68 | 2.31 | 3.16 | 1.97 | 25.02 | |||||||||||||
| 1961 | 0.21 | a | 2.33 | 3.01 | 1.55 | 3.23 | 0.38 | 0.00 | 0.70 | 0.81 | 1.90 | 2.92 | 1.54 | 18.58 | ||||||||||||
| 1962 | 1.88 | 1.01 | 1.27 | 0.96 | 3.70 | 0.59 | 0.05 | 0.16 | 1.16 | 2.31 | 2.56 | 1.78 | 17.43 | |||||||||||||
| 1963 | 1.50 | 1.38 | 1.85 | 2.35 | 1.71 | 1.57 | 0.77 | 0.79 | 1.30 | 1.09 | 2.52 | 1.76 | 18.59 | |||||||||||||
| 1964 | 3.35 | 0.76 | 2.41 | 2.02 | 0.83 | 3.50 | 1.51 | 1.86 | 0.97 | 0.85 | 2.43 | 4.76 | 25.25 | |||||||||||||
| 1965 | 5.70 | 1.15 | 0.72 | 2.32 | 1.92 | 2.17 | 1.50 | 3.72 | 0.28 | 0.25 | 1.55 | 0.55 | b | 21.83 | ||||||||||||
| 1966 | 1.64 | 1.98 | 1.57 | 0.59 | 1.22 | 1.32 | 0.54 | 0.65 | 1.22 | 1.73 | 3.40 | 4.39 | 20.25 | |||||||||||||
| 1967 | 2.12 | 1.00 | 2.48 | 1.72 | 2.16 | 1.54 | 0.00 | 0.03 | 0.93 | 2.69 | 2.40 | 2.38 | 19.45 | |||||||||||||
| 1968 | 1.20 | b | 2.70 | 2.20 | 0.66 | 1.86 | 2.46 | 0.42 | 2.82 | 1.97 | 1.75 | 4.05 | 2.14 | 24.23 | ||||||||||||
| 1969 | 1.99 | a | 1.31 | 0.60 | 4.39 | 1.66 | 3.81 | 0.61 | 0.00 | 1.38 | 2.19 | 1.13 | 2.01 | 21.08 | ||||||||||||
| 1970 | 4.29 | 1.35 | 2.07 | 0.94 | 3.27 | 3.37 | 0.70 | 0.00 | 3.71 | 2.80 | 2.49 | 1.22 | 26.21 | |||||||||||||
| 1971 | 2.96 | 1.05 | 1.39 | 0.71 | 3.33 | 2.90 | 0.63 | 0.68 | 2.04 | 1.19 | 1.60 | 2.33 | 20.81 | |||||||||||||
| 1972 | 1.95 | 2.17 | 1.61 | 1.30 | 1.95 | 2.13 | 0.21 | 0.33 | 1.80 | 0.85 | 3.21 | 1.24 | 18.75 | |||||||||||||
| 1973 | 0.46 | 0.26 | 1.66 | 0.87 | 2.97 | 0.86 | 0.11 | 0.09 | 4.03 | 0.02 | u | 0.00 | z | 0.00 | z | 11.31 | ||||||||||
| 1974 | 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 | |
| 1975 | 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 | |
| 1976 | 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 | |
| 1977 | 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 | |
| 1978 | 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 | |
| 1979 | 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 | |
| 1980 | 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 | |
| 1981 | 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 | |
| 1982 | 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 | |
| 1983 | 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 | |
| 1984 | 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 | |
| 1985 | 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 | |
| 1986 | 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 | |
| 1987 | 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 | |
| 1988 | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.42 | 0.57 | 0.28 | 3.40 | 1.60 | 6.27 | ||||||
| 1989 | 2.97 | 0.95 | 3.11 | 1.33 | 2.06 | 1.97 | 0.30 | 3.32 | 1.37 | 1.16 | 1.89 | 0.58 | 21.01 | |||||||||||||
| 1990 | 2.10 | 1.48 | 2.08 | 3.89 | 4.42 | 2.38 | 0.55 | 0.83 | 0.14 | 2.24 | 2.18 | 1.64 | 23.93 | |||||||||||||
| 1991 | 2.28 | 0.67 | 1.81 | a | 1.66 | 6.46 | 1.79 | 0.07 | 0.04 | 0.00 | 0.97 | 4.20 | 0.95 | 20.90 | ||||||||||||
| 1992 | 1.08 | 1.87 | 0.96 | 0.00 | z | 0.53 | 3.30 | 0.00 | z | 0.90 | 1.03 | 1.74 | 2.62 | 1.67 | 15.70 | |||||||||||
| 1993 | 3.69 | 0.70 | 2.13 | 5.09 | 3.05 | 4.14 | 2.46 | 1.42 | 0.00 | 1.28 | 1.44 | 1.38 | 26.78 | |||||||||||||
| 1994 | 2.75 | 3.41 | 0.48 | 2.84 | 3.69 | 3.67 | 0.43 | 0.00 | 0.69 | 1.85 | 2.89 | a | 2.49 | 25.19 | ||||||||||||
| 1995 | 2.88 | 1.66 | 2.94 | 3.99 | 3.28 | a | 2.67 | 0.61 | 1.23 | 0.00 | z | 2.12 | 5.37 | 2.85 | 29.60 | |||||||||||
| 1996 | 2.30 | 2.51 | 1.30 | 4.67 | 3.83 | 1.10 | 0.32 | 0.57 | 0.90 | 3.24 | 3.88 | 4.63 | 29.25 | |||||||||||||
| 1997 | 2.87 | 1.58 | 1.79 | 4.33 | 0.87 | 2.19 | 2.84 | 0.72 | 1.18 | 0.00 | z | 2.16 | 2.65 | 23.18 | ||||||||||||
| 1998 | 3.29 | 1.35 | b | 1.89 | b | 2.83 | 7.60 | 1.56 | 0.00 | z | 0.02 | 0.00 | z | 1.56 | 0.00 | z | 2.48 | a | 22.58 | |||||||
| 1999 | 1.66 | b | 3.00 | a | 0.00 | z | 0.95 | a | 1.65 | 0.85 | 0.05 | 0.40 | 0.01 | 1.13 | 3.42 | a | 1.78 | 14.90 | ||||||||
| 2000 | 2.29 | 1.76 | 1.85 | 1.45 | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.46 | 0.00 | z | 0.98 | a | 1.04 | 9.83 | |||||||
| 2001 | 1.53 | a | 0.07 | 1.45 | 2.95 | 1.32 | 1.39 | 0.34 | 0.64 | 0.00 | z | 1.14 | d | 0.00 | z | 0.00 | z | 10.83 | ||||||||
| 2002 | 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 | |
| 2003 | 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 | |
| 2004 | 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 | |
| 2005 | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.19 | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.19 | ||
| 2006 | 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 | |
| 2007 | 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 | |
| 2008 | 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 | 2.08 | c | 2.93 | b | 5.01 | |
| 2009 | 0.00 | z | 0.47 | b | 2.50 | i | 0.86 | c | 2.76 | 0.00 | z | 0.00 | 0.00 | 0.00 | 0.44 | b | 0.00 | z | 0.00 | x | 4.53 | |||||
| 2010 | 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 | 3.44 | g | 0.00 | |
| 2011 | 2.99 | d | 1.96 | c | 4.27 | b | 2.53 | d | 4.65 | c | 2.58 | c | 0.43 | g | 0.14 | i | 0.16 | f | 2.57 | j | 0.77 | n | 1.53 | k | 18.98 | |
| 2012 | 2.12 | e | 1.94 | f | 1.99 | c | 3.56 | a | 1.99 | h | 3.13 | l | 0.94 | b | 0.00 | d | 0.13 | j | 2.99 | p | 0.94 | u | 0.14 | v | 8.61 | |
| 2013 | 0.69 | w | 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 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 2.24 | 1.74 | 2.10 | 2.30 | 2.56 | 2.21 | 0.57 | 0.79 | 1.28 | 1.86 | 2.55 | 2.31 | 22.66 | |||||||||||||
| S.D. | 1.18 | 0.86 | 0.90 | 1.13 | 1.53 | 1.37 | 0.59 | 0.92 | 1.29 | 1.03 | 1.32 | 1.15 | 4.33 | |||||||||||||
| SKEW | 1.36 | 0.18 | 0.83 | 0.32 | 0.82 | 0.95 | 1.54 | 1.51 | 2.02 | 0.43 | 0.44 | 0.88 | 0.04 | |||||||||||||
| MAX | 7.07 | 3.55 | 5.19 | 5.09 | 7.60 | 6.64 | 2.84 | 3.72 | 6.62 | 5.04 | 6.01 | 6.39 | 31.42 | |||||||||||||
| MIN | 0.21 | 0.07 | 0.48 | 0.42 | 0.26 | 0.12 | 0.00 | 0.00 | 0.00 | 0.05 | 0.08 | 0.55 | 13.57 | |||||||||||||
| NO YRS | 70 | 68 | 70 | 71 | 70 | 68 | 69 | 73 | 69 | 67 | 69 | 68 | 54 | |||||||||||||