| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 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 | 1.05 | 2.79 | 4.93 | 3.36 | 12.13 | |||||
| 1938 | 2.83 | 5.69 | 3.00 | 1.41 | 0.43 | 0.01 | 0.21 | 0.00 | 0.60 | 1.33 | 1.26 | d | 1.95 | 18.72 | ||||||||||||
| 1939 | 2.05 | 1.76 | 1.56 | 0.25 | 1.53 | 0.52 | 0.61 | 0.00 | 0.24 | 2.30 | 0.14 | 6.92 | a | 17.88 | ||||||||||||
| 1940 | 1.86 | 4.80 | 3.78 | 0.86 | 0.47 | 0.98 | 0.07 | 0.00 | 2.57 | 1.28 | 2.36 | 2.92 | 21.95 | |||||||||||||
| 1941 | 1.96 | 1.81 | 0.77 | 1.61 | 2.41 | 2.59 | 0.12 | 1.03 | 1.07 | 1.55 | a | 2.69 | 7.09 | 24.70 | ||||||||||||
| 1942 | 1.86 | 1.89 | 0.82 | 0.70 | 4.53 | 0.71 | 0.04 | 0.00 | 0.10 | 0.89 | 7.85 | 4.43 | 23.82 | |||||||||||||
| 1943 | 6.36 | 0.78 | 1.93 | 2.32 | 0.65 | 2.02 | 0.00 | 0.35 | 0.19 | 2.77 | 0.92 | b | 1.00 | 19.29 | ||||||||||||
| 1944 | 2.26 | 1.85 | 1.62 | 1.94 | 0.48 | 1.72 | 0.40 | 0.01 | 1.17 | 2.24 | 3.04 | 0.77 | 17.50 | |||||||||||||
| 1945 | 1.56 | 4.11 | 1.91 | 0.73 | 4.20 | 0.55 | 0.00 | 0.07 | 0.44 | 1.29 | 4.55 | 3.57 | 22.98 | |||||||||||||
| 1946 | 3.22 | 1.56 | 1.69 | 0.58 | 1.25 | 0.16 | a | 0.17 | 0.00 | 0.31 | 2.20 | 4.54 | 1.32 | 17.00 | ||||||||||||
| 1947 | 1.31 | 1.39 | 1.92 | 0.62 | 0.71 | 2.32 | 1.26 | 0.10 | 0.08 | 2.87 | 1.92 | 1.65 | 16.15 | |||||||||||||
| 1948 | 5.11 | 2.12 | 2.49 | 2.47 | 2.26 | 1.83 | a | 0.32 | 0.30 | 0.51 | 1.36 | 2.28 | 4.05 | 25.10 | ||||||||||||
| 1949 | 0.70 | 2.55 | 1.38 | 0.06 | 1.15 | 0.59 | 0.00 | 0.01 | 0.66 | 1.43 | 1.55 | 1.40 | 11.48 | |||||||||||||
| 1950 | 6.44 | 1.09 | 2.03 | 0.89 | 0.65 | 0.93 | 0.00 | 0.00 | 0.32 | a | 9.22 | 2.16 | 4.48 | 28.21 | ||||||||||||
| 1951 | 4.21 | 2.16 | 0.87 | 0.55 | 0.66 | 0.00 | 0.00 | 0.29 | 0.04 | 3.39 | a | 2.73 | 5.92 | 20.82 | ||||||||||||
| 1952 | 2.77 | 2.92 | 1.47 | 0.50 | 1.07 | 2.10 | 0.06 | 1.59 | 1.30 | 0.12 | 1.41 | 5.37 | 20.68 | |||||||||||||
| 1953 | 6.00 | 2.43 | 1.70 | a | 0.42 | 4.33 | 1.59 | 0.00 | 0.40 | 1.13 | 1.93 | 5.68 | 2.84 | 28.45 | ||||||||||||
| 1954 | 6.05 | 1.84 | 1.14 | 1.32 | 0.54 | 1.62 | 0.00 | 0.38 | 1.27 | 0.68 | 0.63 | 2.64 | 18.11 | |||||||||||||
| 1955 | 1.38 | 0.70 | 1.43 | 1.61 | 0.41 | 0.17 | 0.00 | 0.00 | 1.03 | 2.18 | 4.27 | a | 7.62 | 20.80 | ||||||||||||
| 1956 | 5.44 | 4.57 | 1.06 | 0.75 | 3.07 | 1.07 | 0.28 | 0.30 | 1.11 | 5.32 | 1.00 | 2.69 | 26.66 | |||||||||||||
| 1957 | 1.43 | 3.14 | 6.03 | 0.48 | a | 1.80 | 0.01 | 0.12 | 0.00 | 1.04 | 2.11 | 2.60 | 4.32 | 23.08 | ||||||||||||
| 1958 | 5.23 | 5.12 | 1.84 | 0.47 | 1.29 | 2.95 | 1.86 | 0.29 | 0.84 | 0.45 | 1.85 | 2.91 | 25.10 | |||||||||||||
| 1959 | 2.41 | 2.73 | 1.01 | 0.44 | 1.80 | 0.36 | 0.00 | 0.33 | 0.68 | 0.50 | 0.10 | 1.36 | 11.72 | |||||||||||||
| 1960 | 2.14 | 4.08 | 3.37 | 1.25 | 1.66 | 0.00 | 1.22 | 0.09 | 0.10 | 0.63 | 4.66 | 2.01 | 21.21 | |||||||||||||
| 1961 | 0.92 | 3.21 | 3.42 | 1.10 | 1.86 | 0.32 | 0.08 | 0.26 | 1.42 | 2.49 | 4.00 | 2.64 | 21.72 | |||||||||||||
| 1962 | 1.71 | 0.88 | 1.83 | 0.82 | 1.53 | 0.66 | 0.00 | 1.51 | 0.70 | 6.61 | 4.02 | 4.56 | 24.83 | |||||||||||||
| 1963 | 0.74 | 2.77 | 1.33 | 2.05 | 2.19 | 1.21 | 0.06 | 0.03 | 0.68 | 1.27 | 4.89 | 1.14 | 18.36 | |||||||||||||
| 1964 | 4.85 | 0.33 | 2.22 | 0.62 | 1.23 | 1.24 | 0.74 | 0.12 | 0.19 | 0.71 | 2.94 | 13.67 | 28.86 | |||||||||||||
| 1965 | 4.69 | 1.12 | 0.12 | 3.45 | 0.50 | 0.75 | 0.18 | 1.26 | 0.00 | 0.40 | 2.17 | 2.85 | 17.49 | |||||||||||||
| 1966 | 4.02 | 0.35 | 1.47 | 0.55 | 0.00 | 0.53 | 0.97 | 0.19 | 1.44 | 0.78 | 5.41 | 3.05 | 18.76 | |||||||||||||
| 1967 | 4.45 | 1.14 | 2.31 | 2.17 | 0.92 | 0.36 | 0.00 | 0.00 | 0.32 | 2.14 | 0.88 | 3.47 | 18.16 | |||||||||||||
| 1968 | 1.83 | 2.53 | 0.83 | 0.84 | 1.12 | 0.19 | 0.00 | 1.80 | 0.57 | 1.01 | 3.17 | 4.15 | 18.04 | |||||||||||||
| 1969 | 6.23 | 1.99 | 0.71 | 0.84 | 1.19 | 2.33 | 0.01 | 0.00 | 0.52 | 2.42 | 0.66 | 6.32 | 23.22 | |||||||||||||
| 1970 | 5.61 | 1.58 | 1.22 | 1.95 | 0.34 | 1.15 | 0.00 | 0.00 | 0.15 | 1.69 | 6.54 | 3.95 | 24.18 | |||||||||||||
| 1971 | 4.11 | 1.65 | 3.40 | 1.62 | 1.00 | 1.56 | 0.23 | 0.12 | 1.51 | 1.08 | 3.55 | 2.83 | 22.66 | |||||||||||||
| 1972 | 4.75 | 2.63 | 4.02 | 1.29 | 1.30 | 1.86 | 0.21 | 0.32 | 1.53 | 1.22 | 0.96 | 3.19 | 23.28 | |||||||||||||
| 1973 | 1.80 | 0.40 | 1.78 | 1.05 | 0.44 | 0.08 | 0.02 | 0.07 | 0.77 | 3.57 | 7.29 | 3.24 | 20.51 | |||||||||||||
| 1974 | 5.81 | 3.49 | 3.67 | 1.74 | 0.34 | 0.02 | 0.22 | 0.00 | 0.00 | 1.27 | 1.87 | 3.83 | 22.26 | |||||||||||||
| 1975 | 2.89 | 2.61 | 4.45 | 1.50 | 0.22 | 0.36 | 0.42 | 0.56 | 0.72 | 2.79 | 2.28 | 3.47 | 22.27 | |||||||||||||
| 1976 | 1.69 | 2.21 | 1.45 | 1.36 | 0.23 | 0.08 | 0.62 | 3.57 | 1.06 | 0.24 | 0.42 | 0.41 | 13.34 | |||||||||||||
| 1977 | 1.42 | 1.20 | 1.04 | 0.62 | 2.47 | 0.61 | 0.22 | 0.90 | 4.87 | 1.17 | 5.50 | 5.35 | 25.37 | |||||||||||||
| 1978 | 1.64 | 2.35 | 2.00 | 1.70 | 0.69 | 0.65 | 0.86 | 1.47 | 2.08 | 0.03 | 1.10 | 0.98 | 15.55 | |||||||||||||
| 1979 | 2.70 | 1.86 | 0.98 | 2.67 | 1.27 | 0.40 | 0.03 | 0.65 | 0.47 | 4.29 | 3.10 | 2.35 | 20.77 | |||||||||||||
| 1980 | 3.04 | 2.10 | 1.65 | 2.00 | 0.64 | 1.93 | 0.01 | 0.00 | 0.41 | 1.66 | 2.09 | 3.05 | 18.58 | |||||||||||||
| 1981 | 1.03 | 1.58 | 1.46 | 0.96 | 1.40 | 0.45 | 0.65 | 0.00 | 1.07 | 1.75 | 6.75 | 8.50 | 25.60 | |||||||||||||
| 1982 | 1.69 | 3.68 | m | 2.80 | z | 1.10 | o | 0.04 | 1.61 | 0.13 | b | 0.03 | b | 1.63 | 2.07 | 1.76 | 6.48 | b | 15.44 | |||||||
| 1983 | 1.80 | 5.61 | 4.45 | 1.16 | 1.45 | 0.77 | 0.74 | 2.47 | 1.56 | 1.31 | e | 5.72 | h | 7.43 | h | 21.32 | ||||||||||
| 1984 | 0.29 | b | 2.89 | 2.37 | g | 1.50 | b | 0.60 | 0.70 | 0.00 | 0.78 | 0.33 | 2.58 | e | 6.85 | e | 2.59 | c | 19.11 | |||||||
| 1985 | 0.25 | k | 1.78 | 1.38 | 0.44 | 0.94 | 0.37 | b | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 1.01 | 5.92 | ||||||
| 1986 | 2.42 | 4.98 | 1.32 | 0.73 | 1.88 | d | 0.67 | 0.02 | 0.00 | 2.45 | 1.53 | 5.02 | j | 1.13 | 17.13 | |||||||||||
| 1987 | 2.94 | 2.08 | c | 1.51 | 0.53 | 0.77 | 0.39 | 1.59 | 0.00 | 0.00 | 0.01 | 1.93 | 3.90 | 15.65 | ||||||||||||
| 1988 | 2.21 | 0.43 | 0.75 | 1.76 | 1.81 | 1.42 | 0.00 | 0.02 | 0.37 | 0.19 | 5.05 | 1.45 | c | 15.46 | ||||||||||||
| 1989 | 2.78 | 1.06 | 4.50 | 2.17 | 2.76 | 0.20 | 0.00 | 0.88 | a | 2.04 | 1.06 | 0.88 | 0.88 | 19.21 | ||||||||||||
| 1990 | 3.29 | 0.94 | 2.52 | b | 0.96 | 2.30 | 0.28 | 0.26 | 0.00 | z | 0.00 | z | 1.44 | 1.69 | 1.19 | b | 14.87 | |||||||||
| 1991 | 1.36 | 2.04 | 3.39 | 2.07 | 2.84 | 0.68 | 1.46 | 0.28 | 0.00 | 0.51 | c | 2.62 | 1.36 | g | 17.25 | |||||||||||
| 1992 | 1.07 | b | 0.75 | 0.76 | 1.27 | a | 1.83 | 1.69 | 1.59 | 0.00 | 0.25 | 2.47 | 1.93 | c | 3.93 | d | 17.54 | |||||||||
| 1993 | 3.54 | b | 1.69 | a | 1.69 | 2.74 | c | 3.01 | 1.68 | 0.69 | 1.14 | 0.00 | 1.32 | a | 0.90 | 2.39 | d | 20.79 | ||||||||
| 1994 | 1.06 | d | 1.38 | 1.72 | 1.06 | d | 1.06 | 0.15 | 0.07 | 0.00 | 1.29 | 0.50 | b | 5.73 | c | 2.34 | f | 14.02 | ||||||||
| 1995 | 3.38 | b | 2.37 | 2.84 | f | 3.42 | f | 1.50 | g | 1.65 | a | 1.26 | b | 0.00 | 0.22 | c | 0.20 | 1.50 | l | 7.50 | q | 9.08 | ||||
| 1996 | 4.51 | v | 3.85 | h | 1.27 | i | 2.30 | d | 2.40 | c | 0.26 | e | 1.42 | d | 0.15 | 0.58 | b | 2.37 | h | 3.45 | q | 10.95 | l | 7.11 | ||
| 1997 | 5.63 | j | 1.82 | f | 1.32 | f | 2.38 | m | 1.44 | c | 0.86 | f | 1.05 | f | 1.08 | d | 1.32 | d | 2.38 | i | 1.27 | k | 2.54 | g | 3.84 | |
| 1998 | 4.58 | l | 3.00 | j | 2.56 | k | 2.06 | h | 4.32 | l | 0.90 | b | 0.05 | 0.00 | 0.12 | b | 1.19 | h | 8.29 | n | 1.76 | i | 1.07 | |||
| 1999 | 4.04 | o | 4.05 | i | 2.25 | m | 0.66 | d | 0.67 | e | 0.00 | 0.00 | 1.72 | h | 0.00 | 0.39 | f | 3.29 | n | 1.04 | e | 2.37 | ||||
| 2000 | 5.68 | o | 1.84 | i | 2.46 | j | 3.59 | i | 0.66 | e | 0.79 | h | 0.84 | i | 0.04 | b | 0.53 | e | 1.58 | e | 1.31 | g | 0.95 | p | 2.81 | |
| 2001 | 1.01 | d | 0.83 | j | 1.50 | h | 1.40 | l | 0.48 | d | 0.16 | e | 0.32 | 0.01 | 0.68 | b | 0.36 | 3.90 | o | 4.15 | l | 3.02 | ||||
| 2002 | 2.26 | k | 1.52 | h | 1.41 | i | 1.95 | i | 0.86 | h | 0.06 | 0.08 | b | 0.00 | 0.07 | g | 0.38 | c | 3.26 | g | 8.69 | r | 0.52 | |||
| 2003 | 0.17 | 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 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 2.92 | 2.23 | 2.00 | 1.25 | 1.37 | 0.88 | 0.35 | 0.41 | 0.82 | 1.75 | 2.98 | 3.42 | 20.69 | |||||||||||||
| S.D. | 1.72 | 1.33 | 1.20 | 0.73 | 1.03 | 0.76 | 0.50 | 0.68 | 0.81 | 1.58 | 2.01 | 2.35 | 4.10 | |||||||||||||
| SKEW | 0.62 | 0.95 | 1.24 | 0.74 | 1.24 | 0.79 | 1.52 | 2.50 | 2.28 | 2.39 | 0.66 | 1.78 | -0.10 | |||||||||||||
| MAX | 6.44 | 5.69 | 6.03 | 3.45 | 4.53 | 2.95 | 1.86 | 3.57 | 4.87 | 9.22 | 7.85 | 13.67 | 28.86 | |||||||||||||
| MIN | 0.29 | 0.33 | 0.12 | 0.06 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.10 | 0.41 | 11.48 | |||||||||||||
| NO YRS | 58 | 57 | 55 | 58 | 62 | 63 | 62 | 62 | 63 | 61 | 55 | 56 | 49 | |||||||||||||