| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 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 | 0.20 | 0.78 | 0.59 | 0.86 | 2.43 | |||||
| 1932 | 1.19 | 0.10 | 3.40 | 1.70 | 2.14 | 1.74 | 0.50 | 0.00 | 0.00 | 0.69 | 0.65 | 0.50 | 12.61 | |||||||||||||
| 1933 | 1.01 | 1.73 | 1.04 | 0.96 | 1.00 | 0.10 | 0.00 | 0.17 | 0.60 | 0.00 | z | 1.10 | 0.60 | 8.31 | ||||||||||||
| 1934 | 1.50 | 1.40 | 0.72 | 1.12 | 0.23 | 1.89 | 0.20 | 0.00 | z | 0.45 | 1.24 | 1.41 | 1.89 | 12.05 | ||||||||||||
| 1935 | 1.95 | 0.82 | 1.21 | 2.32 | 1.50 | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.16 | 0.74 | 1.38 | 10.08 | |||||||||
| 1936 | 2.21 | 1.52 | 0.73 | 1.41 | 0.18 | 1.63 | 0.00 | z | 0.30 | 0.00 | z | 0.00 | z | 0.00 | 0.98 | 8.96 | ||||||||||
| 1937 | 1.29 | 1.10 | 0.85 | 0.00 | z | 0.00 | z | 0.59 | 0.74 | 0.00 | 0.34 | 1.12 | 2.00 | 2.50 | 10.53 | |||||||||||
| 1938 | 1.41 | 0.61 | 2.56 | 1.80 | 0.00 | z | 0.00 | z | 1.45 | 0.17 | 0.24 | 0.00 | z | 0.00 | z | 0.00 | z | 8.24 | ||||||||
| 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 | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | |
| 1943 | 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 | |
| 1944 | 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 | |
| 1945 | 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 | |
| 1946 | 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 | |
| 1947 | 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 | |
| 1948 | 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 | |
| 1949 | 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 | |
| 1950 | 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 | |
| 1951 | 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 | |
| 1952 | 0.00 | z | 0.00 | z | 1.50 | b | 0.33 | 0.57 | 1.49 | 0.15 | 0.60 | 0.22 | 0.00 | 0.60 | 0.54 | d | 6.00 | |||||||||
| 1953 | 1.15 | c | 0.60 | 0.50 | b | 0.25 | 2.88 | 1.94 | 0.00 | 0.03 | 0.00 | 0.00 | z | 0.78 | 1.26 | 9.39 | ||||||||||
| 1954 | 0.45 | f | 0.00 | z | 1.00 | 0.02 | 0.10 | 0.85 | 0.00 | 0.04 | 0.00 | 0.60 | 0.08 | 0.00 | z | 2.69 | ||||||||||
| 1955 | 0.00 | z | 0.00 | z | 0.55 | 2.79 | 1.44 | a | 1.00 | 0.10 | 0.00 | 0.38 | 0.45 | 1.51 | 3.35 | 11.57 | ||||||||||
| 1956 | 3.65 | a | 0.42 | 0.50 | 1.14 | 2.32 | 0.23 | 0.26 | a | 0.00 | 0.00 | 2.07 | 0.05 | 1.18 | 11.82 | |||||||||||
| 1957 | 0.80 | 0.98 | 2.56 | 0.88 | 2.46 | 0.82 | 0.05 | 0.12 | 0.21 | a | 1.61 | 0.98 | 1.61 | 13.08 | ||||||||||||
| 1958 | 1.28 | a | 2.43 | 0.52 | 0.92 | 0.66 | 1.29 | 0.29 | 0.14 | 0.08 | 0.00 | 0.97 | 0.79 | 9.37 | ||||||||||||
| 1959 | 0.96 | 0.66 | 1.25 | 0.16 | 0.46 | 0.28 | 0.04 | 0.26 | 2.78 | 0.54 | 0.15 | 0.76 | 8.30 | |||||||||||||
| 1960 | 1.61 | 1.20 | 1.14 | 0.27 | 0.86 | 0.00 | 0.70 | 0.38 | 0.00 | 0.19 | 2.01 | 0.63 | 8.99 | |||||||||||||
| 1961 | 1.06 | 0.98 | c | 1.48 | 0.00 | 0.12 | 0.06 | 0.38 | 0.09 | 0.47 | 1.31 | 0.16 | 0.67 | a | 6.78 | |||||||||||
| 1962 | 0.85 | 1.55 | 1.22 | 0.93 | 1.77 | a | 0.19 | 0.36 | 0.00 | 0.12 | 2.24 | 1.08 | 0.45 | 10.76 | ||||||||||||
| 1963 | 1.28 | 1.60 | 0.24 | 1.55 | 1.48 | 1.68 | 0.00 | 0.24 | 0.46 | 1.17 | 1.86 | 0.67 | 12.23 | |||||||||||||
| 1964 | 1.84 | 0.10 | 0.29 | 1.00 | 1.37 | 2.20 | 0.04 | 0.28 | 0.00 | 0.17 | 1.60 | 2.23 | 11.12 | |||||||||||||
| 1965 | 1.99 | 0.06 | 0.03 | 0.00 | z | 0.61 | 0.53 | 0.14 | 0.64 | 0.16 | 0.00 | 0.93 | a | 0.22 | b | 5.31 | ||||||||||
| 1966 | 0.37 | 0.41 | 0.07 | 0.00 | 0.52 | 0.26 | 0.00 | 0.00 | 0.05 | 0.25 | 2.64 | 1.01 | 5.58 | |||||||||||||
| 1967 | 2.53 | 0.60 | 0.36 | 1.28 | 0.56 | 2.41 | 0.08 | 0.00 | 0.51 | 0.28 | 1.06 | 0.73 | 10.40 | |||||||||||||
| 1968 | 0.61 | a | 1.30 | 0.48 | 0.65 | 1.69 | 0.24 | 0.02 | 4.45 | 0.00 | 0.67 | 2.33 | 1.45 | 13.89 | ||||||||||||
| 1969 | 3.96 | 0.10 | a | 0.21 | 0.56 | 0.32 | 1.60 | 0.00 | 0.00 | 0.24 | 1.32 | 0.47 | 1.81 | 10.59 | ||||||||||||
| 1970 | 4.04 | 0.00 | 1.32 | 1.30 | 0.74 | 1.18 | 0.60 | 0.00 | 1.15 | 0.73 | 2.81 | 1.78 | 15.65 | |||||||||||||
| 1971 | 2.17 | 0.56 | 1.97 | 0.47 | 0.20 | 1.62 | 0.00 | 0.00 | 1.69 | 0.67 | 1.78 | 1.64 | 12.77 | |||||||||||||
| 1972 | 0.79 | 1.60 | 1.45 | 0.63 | 0.82 | 2.71 | 0.00 | 0.00 | 0.86 | 0.86 | 0.89 | 1.60 | 12.21 | |||||||||||||
| 1973 | 1.08 | 0.32 | 0.64 | 2.09 | 0.14 | 0.60 | 0.30 | 0.12 | 1.25 | 0.78 | 2.01 | 1.56 | 10.89 | |||||||||||||
| 1974 | 0.90 | 0.54 | 2.22 | 0.56 | 0.00 | n | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 1.09 | 0.00 | z | 5.31 | ||||||
| 1975 | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.96 | 2.39 | 1.07 | 0.25 | 0.10 | 4.08 | 1.13 | 1.81 | 11.79 | |||||||||
| 1976 | 1.33 | 1.49 | 0.86 | 1.38 | 0.43 | 1.28 | 1.25 | 1.54 | 0.77 | 0.71 | 0.34 | 0.16 | 11.54 | |||||||||||||
| 1977 | 1.31 | 0.70 | 1.26 | 0.76 | 2.90 | 0.73 | 0.48 | 1.37 | 1.80 | 0.31 | 2.17 | 2.72 | 16.51 | |||||||||||||
| 1978 | 2.75 | 2.51 | 1.28 | 4.42 | 0.51 | 0.66 | b | 0.75 | 0.77 | 1.03 | 0.00 | 1.50 | 0.82 | 17.00 | ||||||||||||
| 1979 | 0.00 | z | 1.63 | 1.38 | 1.76 | 0.97 | 0.75 | 0.11 | 1.53 | 0.00 | 2.07 | 1.05 | 0.79 | 12.04 | ||||||||||||
| 1980 | 2.07 | 2.11 | 0.00 | z | 0.34 | 3.61 | 2.28 | 0.25 | 0.00 | 1.87 | 0.82 | 1.04 | 2.09 | 16.48 | ||||||||||||
| 1981 | 1.44 | 1.31 | 2.82 | 1.90 | 2.27 | 1.16 | 0.24 | 0.20 | 0.19 | 2.14 | 3.44 | 4.68 | 21.79 | |||||||||||||
| 1982 | 2.22 | a | 1.93 | 1.92 | 1.80 | 0.16 | v | 4.47 | 2.13 | 0.11 | 1.87 | g | 2.70 | 2.64 | c | 5.24 | 25.16 | |||||||||
| 1983 | 3.72 | d | 2.28 | g | 4.34 | f | 1.98 | e | 2.58 | 1.45 | a | 1.48 | 3.84 | 0.60 | 1.09 | 4.02 | a | 4.21 | b | 24.97 | ||||||
| 1984 | 0.37 | b | 1.71 | 2.65 | a | 1.63 | a | 1.16 | 2.43 | 0.78 | 0.30 | 0.23 | 1.45 | 0.00 | z | 0.95 | 13.66 | |||||||||
| 1985 | 0.12 | 0.47 | 1.19 | b | 0.37 | 1.71 | 0.46 | 1.86 | b | 0.04 | 1.84 | c | 0.75 | 2.80 | d | 1.09 | 12.70 | |||||||||
| 1986 | 1.22 | 5.19 | a | 1.99 | a | 1.74 | b | 2.06 | 0.02 | 0.00 | 0.25 | 2.01 | g | 0.11 | b | 0.00 | z | 0.00 | z | 12.58 | ||||||
| 1987 | 1.69 | 2.30 | 1.39 | a | 0.45 | a | 1.90 | b | 0.77 | l | 0.44 | a | 0.00 | z | 0.00 | z | 0.03 | 0.94 | a | 0.43 | c | 9.57 | ||||
| 1988 | 1.01 | 0.17 | 1.23 | 1.65 | a | 0.98 | 0.90 | b | 0.05 | 0.00 | 0.36 | 0.00 | 4.81 | g | 1.73 | f | 6.35 | |||||||||
| 1989 | 1.55 | a | 1.24 | 3.91 | b | 1.12 | 0.78 | 0.00 | b | 0.00 | 0.46 | 1.00 | a | 1.16 | c | 0.93 | b | 0.00 | 12.15 | |||||||
| 1990 | 1.52 | 1.38 | 0.39 | 1.86 | c | 2.24 | 0.46 | a | 0.00 | z | 1.62 | 0.21 | 0.89 | 1.10 | a | 1.06 | a | 12.73 | ||||||||
| 1991 | 0.71 | 0.88 | 1.78 | 2.62 | b | 3.99 | c | 1.55 | a | 0.00 | 0.00 | z | 0.54 | 1.40 | 1.80 | a | 0.87 | 16.14 | ||||||||
| 1992 | 0.32 | e | 1.06 | a | 0.86 | 0.88 | 0.22 | 2.96 | 0.18 | 0.00 | 0.00 | z | 0.91 | b | 1.55 | f | 2.13 | c | 9.52 | |||||||
| 1993 | 1.33 | c | 1.44 | c | 3.64 | c | 2.73 | b | 0.66 | c | 1.72 | a | 0.86 | 0.47 | a | 0.00 | 0.99 | a | 0.28 | b | 0.71 | 14.83 | ||||
| 1994 | 1.21 | a | 2.07 | c | 0.31 | 1.93 | 0.92 | 0.35 | 0.00 | 0.00 | 0.05 | a | 1.05 | d | 2.30 | d | 1.88 | a | 12.07 | |||||||
| 1995 | 2.51 | d | 0.00 | p | 2.84 | 2.19 | a | 2.27 | a | 1.30 | 1.60 | 0.17 | 0.11 | b | 1.06 | g | 2.22 | c | 3.79 | c | 19.00 | |||||
| 1996 | 2.55 | f | 1.46 | 2.01 | a | 1.97 | c | 2.08 | a | 0.53 | 0.00 | 0.28 | 0.16 | 1.49 | 1.73 | c | 5.82 | c | 17.53 | |||||||
| 1997 | 4.57 | b | 0.30 | 0.94 | 2.33 | 1.70 | 1.45 | d | 0.43 | b | 0.47 | a | 0.37 | 0.39 | 1.04 | a | 0.99 | d | 14.98 | |||||||
| 1998 | 3.02 | 2.23 | a | 1.70 | 1.91 | 6.59 | 0.00 | z | 0.86 | a | 0.00 | 1.45 | e | 0.12 | 1.93 | d | 0.91 | d | 20.72 | |||||||
| 1999 | 3.29 | j | 2.61 | b | 1.13 | 0.88 | 1.03 | 0.42 | b | 0.00 | 0.24 | 0.00 | 0.33 | 0.61 | a | 1.37 | e | 8.62 | ||||||||
| 2000 | 5.37 | b | 2.80 | a | 2.25 | 0.93 | 1.19 | 0.67 | 0.00 | 0.37 | 0.49 | d | 3.54 | 1.01 | 1.06 | a | 19.68 | |||||||||
| 2001 | 0.00 | z | 0.62 | a | 2.16 | a | 1.23 | a | 0.60 | e | 0.49 | a | 1.74 | a | 0.00 | 0.00 | 0.50 | a | 2.09 | g | 2.34 | k | 7.34 | |||
| 2002 | 1.72 | d | 0.58 | a | 1.24 | b | 1.40 | g | 0.47 | b | 0.74 | 0.45 | a | 0.00 | 0.50 | a | 0.23 | 0.44 | 2.76 | i | 6.37 | |||||
| 2003 | 1.66 | a | 0.89 | b | 1.30 | 2.95 | 3.20 | b | 0.07 | 0.15 | 0.73 | b | 0.00 | 0.00 | 0.00 | z | 0.00 | z | 10.95 | |||||||
| 2004 | 0.00 | z | 1.36 | o | 0.52 | 0.70 | 3.46 | i | 0.29 | d | 0.22 | a | 1.21 | b | 0.60 | 0.00 | z | 0.00 | z | 0.00 | z | 3.54 | ||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 1.73 | 1.21 | 1.35 | 1.31 | 1.40 | 1.11 | 0.42 | 0.44 | 0.49 | 0.91 | 1.34 | 1.54 | 12.51 | |||||||||||||
| S.D. | 1.12 | 0.92 | 0.91 | 0.88 | 1.19 | 0.91 | 0.55 | 0.84 | 0.61 | 0.87 | 0.89 | 1.27 | 3.53 | |||||||||||||
| SKEW | 1.34 | 1.60 | 0.88 | 0.85 | 1.82 | 1.15 | 1.52 | 3.37 | 1.75 | 1.60 | 0.78 | 1.73 | 0.59 | |||||||||||||
| MAX | 5.37 | 5.19 | 3.91 | 4.42 | 6.59 | 4.47 | 2.13 | 4.45 | 2.78 | 4.08 | 4.02 | 5.82 | 21.79 | |||||||||||||
| MIN | 0.12 | 0.00 | 0.03 | 0.00 | 0.10 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 5.58 | |||||||||||||
| NO YRS | 51 | 53 | 57 | 56 | 55 | 55 | 56 | 55 | 54 | 54 | 53 | 52 | 28 | |||||||||||||