| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1948 | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 1.39 | 1.16 | 0.23 | 2.39 | 1.98 | a | 7.15 | |||||
| 1949 | 1.28 | 1.23 | 0.89 | 0.51 | 1.08 | 1.69 | 0.50 | 0.49 | 1.29 | 1.89 | 0.91 | 1.18 | 12.94 | |||||||||||||
| 1950 | 2.32 | 0.93 | 1.32 | 0.92 | h | 1.02 | a | 2.39 | 2.05 | 1.22 | 1.58 | h | 1.77 | 1.04 | 1.09 | 15.15 | ||||||||||
| 1951 | 1.31 | 0.84 | 1.53 | 1.19 | 3.00 | 2.62 | 2.26 | 2.31 | a | 0.44 | 2.75 | 0.90 | 1.94 | 21.09 | ||||||||||||
| 1952 | 1.22 | 1.30 | 2.03 | 0.72 | 2.18 | 1.78 | 3.55 | 1.87 | 0.19 | 0.00 | 0.33 | 1.35 | 16.52 | |||||||||||||
| 1953 | 1.26 | a | 1.77 | 1.00 | 3.23 | 2.50 | 1.15 | 0.79 | 1.11 | 0.65 | 0.18 | 0.59 | 1.57 | 15.80 | ||||||||||||
| 1954 | 1.59 | 0.80 | 1.93 | 2.31 | 1.48 | 3.70 | 1.39 | 0.74 | 1.36 | 1.10 | 0.72 | 1.08 | 18.20 | |||||||||||||
| 1955 | 1.31 | 0.95 | 2.01 | 0.47 | 2.79 | 1.47 | 1.05 | 0.86 | 1.37 | 1.53 | 1.95 | 3.81 | 19.57 | |||||||||||||
| 1956 | 1.94 | 0.71 | 0.70 | 2.06 | c | 1.43 | 0.79 | 1.49 | 0.95 | 0.80 | 0.58 | 0.00 | e | 0.94 | 12.39 | |||||||||||
| 1957 | 1.30 | 1.11 | 1.31 | 1.96 | 1.63 | 2.58 | 1.83 | 1.59 | 0.73 | 0.89 | 1.25 | 0.33 | l | 16.18 | ||||||||||||
| 1958 | 0.65 | f | 0.55 | 0.75 | 1.98 | 2.03 | 1.72 | 1.43 | 2.16 | 0.78 | 0.56 | 1.86 | 0.70 | m | 13.82 | |||||||||||
| 1959 | 0.86 | S | 1.67 | 0.85 | 1.10 | 2.94 | 1.79 | 1.06 | 1.13 | 1.60 | 1.85 | 0.51 | 0.29 | 15.65 | ||||||||||||
| 1960 | 0.66 | 1.32 | 1.16 | 2.62 | 1.61 | 2.43 | 0.70 | 1.35 | 0.41 | 1.55 | 1.04 | 0.83 | 15.68 | |||||||||||||
| 1961 | 0.16 | 1.70 | 0.67 | 1.19 | 2.51 | 0.65 | 1.70 | 2.41 | 4.04 | 2.00 | 1.06 | 1.97 | 20.06 | |||||||||||||
| 1962 | 2.16 | 1.92 | 1.31 | 0.96 | 3.71 | 2.45 | 1.75 | 2.17 | 1.34 | 0.61 | 2.03 | 0.63 | 21.04 | |||||||||||||
| 1963 | 1.82 | 1.07 | 1.26 | 1.96 | 3.74 | 3.28 | 0.60 | 0.42 | 3.64 | 0.97 | 0.99 | 0.05 | y | 19.75 | ||||||||||||
| 1964 | 1.52 | 1.10 | 1.10 | 0.47 | b | 1.55 | 3.34 | 1.38 | 1.02 | 0.36 | 1.95 | 0.99 | a | 3.44 | 18.22 | |||||||||||
| 1965 | 2.69 | 0.97 | 0.49 | 1.77 | 1.14 | 3.79 | 1.55 | 1.86 | 2.04 | 0.44 | 0.63 | 1.30 | 18.67 | |||||||||||||
| 1966 | 0.94 | 0.54 | 0.93 | 1.14 | 1.21 | 1.63 | 0.78 | 1.55 | 2.25 | 0.72 | 1.71 | 1.53 | 14.93 | |||||||||||||
| 1967 | 2.23 | 0.68 | 0.55 | q | 1.49 | 1.57 | 3.27 | 1.87 | 0.82 | 0.56 | 2.42 | p | 0.51 | j | 2.47 | 14.96 | ||||||||||
| 1968 | 1.86 | 0.39 | 0.49 | 0.93 | 0.37 | s | 4.71 | 1.37 | 4.03 | 2.30 | 1.11 | 2.64 | 1.42 | 21.25 | ||||||||||||
| 1969 | 2.44 | 0.39 | 0.20 | 1.31 | 1.79 | 3.50 | 0.90 | 0.11 | 0.81 | 1.39 | 0.89 | 0.96 | 14.69 | |||||||||||||
| 1970 | 1.07 | 0.20 | g | 1.15 | f | 1.40 | 2.07 | 4.35 | 1.68 | 1.13 | 3.40 | 0.90 | 0.00 | v | 1.85 | 17.85 | ||||||||||
| 1971 | 1.97 | 1.58 | 0.87 | 0.00 | z | 1.74 | 1.02 | 1.26 | 1.35 | 2.22 | 1.29 | 0.94 | 0.52 | t | 14.24 | |||||||||||
| 1972 | 0.72 | 0.65 | 0.68 | 1.12 | 0.95 | 2.53 | 2.59 | 2.13 | 3.29 | 1.53 | 0.95 | 1.77 | 18.91 | |||||||||||||
| 1973 | 0.57 | 0.35 | 0.37 | 0.35 | 1.57 | 1.48 | 1.94 | 2.75 | 2.09 | 0.77 | 1.26 | 0.06 | 13.56 | |||||||||||||
| 1974 | 0.92 | 0.32 | 3.07 | 0.32 | 0.62 | 1.13 | 1.19 | 1.28 | 0.26 | 1.39 | 0.34 | 0.83 | S | 11.67 | ||||||||||||
| 1975 | 1.96 | 0.78 | 0.62 | g | 1.17 | j | 1.84 | 1.44 | 2.97 | 1.18 | 0.58 | 2.63 | a | 1.81 | a | 0.19 | w | 15.19 | ||||||||
| 1976 | 1.73 | 1.49 | 1.19 | 0.57 | 1.29 | 2.20 | 0.92 | 0.73 | 1.86 | 0.68 | 0.50 | 0.23 | 13.39 | |||||||||||||
| 1977 | 0.57 | 0.19 | 0.51 | 0.25 | 2.32 | 1.67 | 2.43 | 2.98 | 1.50 | 0.73 | 0.67 | c | 1.95 | 15.77 | ||||||||||||
| 1978 | 2.50 | 1.80 | 0.75 | 1.00 | 2.08 | 1.07 | 1.04 | 0.92 | 0.60 | 0.29 | 1.30 | 1.15 | 14.50 | |||||||||||||
| 1979 | 1.49 | 1.06 | 1.44 | 0.30 | 0.82 | 1.98 | 0.92 | 2.32 | 0.25 | 0.91 | 0.92 | 0.58 | 12.99 | |||||||||||||
| 1980 | 2.02 | 0.93 | 0.80 | m | 0.57 | 2.51 | 1.93 | 2.30 | 1.88 | 0.00 | z | 0.25 | 1.09 | a | 1.61 | 15.09 | ||||||||||
| 1981 | 0.46 | 1.76 | 0.73 | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.54 | 0.00 | z | 0.00 | z | 0.00 | z | 1.65 | 5.14 | ||||||
| 1982 | 1.75 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 2.63 | 2.06 | 0.00 | z | 0.00 | z | 0.00 | z | 0.92 | a | 0.77 | a | 6.38 | |||
| 1983 | 0.00 | z | 0.48 | a | 0.62 | 0.39 | 0.00 | z | 0.90 | 3.23 | 1.80 | 2.20 | a | 1.97 | 1.84 | a | 1.12 | e | 14.55 | |||||||
| 1984 | 0.33 | b | 0.33 | c | 0.48 | b | 0.55 | d | 2.26 | 0.00 | z | 3.06 | 2.32 | b | 1.99 | 0.36 | 1.16 | 1.13 | a | 13.97 | ||||||
| 1985 | 0.51 | c | 0.84 | c | 1.45 | c | 0.52 | 1.17 | b | 1.55 | 2.49 | 0.74 | a | 2.52 | b | 0.67 | b | 2.25 | b | 0.62 | 15.33 | |||||
| 1986 | 0.95 | 1.34 | 1.18 | b | 1.33 | b | 0.62 | 1.93 | a | 0.00 | z | 1.67 | a | 2.24 | 0.79 | 1.28 | b | 0.13 | 13.46 | |||||||
| 1987 | 0.67 | 0.35 | 0.99 | a | 0.30 | 2.78 | 2.19 | 4.30 | 1.38 | 0.19 | 0.00 | 0.83 | 0.83 | c | 14.81 | |||||||||||
| 1988 | 0.89 | b | 0.56 | 0.81 | a | 2.22 | 2.51 | 0.76 | 0.89 | 0.22 | 0.24 | 0.15 | 1.47 | c | 0.76 | 11.48 | ||||||||||
| 1989 | 1.60 | 0.92 | 1.91 | b | 1.07 | 3.18 | 1.74 | 1.77 | 1.18 | 0.26 | 2.15 | 0.76 | 1.82 | 18.36 | ||||||||||||
| 1990 | 1.62 | 0.37 | 0.80 | 1.42 | a | 2.22 | 1.67 | 1.12 | 2.35 | 1.07 | 1.79 | 0.56 | 1.04 | a | 16.03 | |||||||||||
| 1991 | 0.61 | 0.31 | 1.16 | a | 2.21 | 3.83 | 0.61 | 0.75 | a | 1.18 | b | 1.82 | 1.70 | 1.60 | 0.93 | 16.71 | ||||||||||
| 1992 | 0.14 | 0.50 | 0.55 | 1.72 | 2.21 | 5.78 | 2.08 | 1.27 | 1.71 | 1.40 | 1.05 | a | 1.45 | a | 19.86 | |||||||||||
| 1993 | 1.22 | 0.79 | 1.18 | a | 2.27 | a | 2.28 | 2.63 | b | 2.51 | 1.49 | 0.24 | a | 1.02 | 0.75 | 0.87 | 17.25 | |||||||||
| 1994 | 0.70 | 1.39 | 1.02 | 0.94 | 1.65 | 2.62 | 1.75 | 0.56 | 1.08 | 0.89 | 1.17 | b | 1.80 | 15.57 | ||||||||||||
| 1995 | 0.98 | b | 0.70 | 1.77 | e | 1.55 | 0.85 | 1.90 | a | 2.07 | 1.42 | 1.46 | 1.74 | 1.37 | c | 1.42 | c | 17.23 | ||||||||
| 1996 | 1.84 | c | 0.68 | 1.94 | a | 1.20 | 3.58 | 0.87 | 0.73 | 0.96 | 0.98 | 0.72 | 2.24 | 3.05 | 18.79 | |||||||||||
| 1997 | 2.50 | a | 1.29 | b | 1.08 | 1.17 | 0.86 | 2.60 | 3.42 | a | 2.25 | 2.24 | c | 1.74 | 0.48 | d | 0.96 | b | 20.59 | |||||||
| 1998 | 1.89 | a | 0.44 | e | 0.63 | a | 0.26 | 0.65 | 4.15 | a | 1.43 | 0.57 | 2.03 | 0.00 | z | 2.36 | d | 0.92 | a | 15.33 | ||||||
| 1999 | 1.94 | b | 1.06 | a | 0.42 | 1.50 | 1.57 | 2.08 | 0.84 | 3.46 | 0.80 | 0.82 | 0.31 | b | 2.20 | 17.00 | ||||||||||
| 2000 | 1.13 | b | 0.87 | a | 1.20 | 0.78 | b | 2.80 | a | 1.76 | 0.20 | 1.66 | 2.21 | 1.01 | b | 0.22 | e | 0.84 | a | 14.68 | ||||||
| 2001 | 0.34 | a | 0.55 | c | 0.31 | e | 1.58 | a | 1.91 | 1.55 | a | 1.74 | 0.26 | 0.50 | 1.41 | 1.09 | 1.05 | 12.29 | ||||||||
| 2002 | 0.88 | b | 0.40 | 0.72 | 1.22 | 1.83 | a | 1.91 | 1.31 | 1.06 | 1.08 | 1.46 | 1.10 | a | 0.47 | b | 13.44 | |||||||||
| 2003 | 0.90 | a | 0.98 | 1.64 | 1.67 | 1.67 | a | 0.94 | 0.65 | 0.41 | 0.69 | 1.24 | a | 0.73 | e | 1.41 | c | 12.93 | ||||||||
| 2004 | 1.95 | b | 0.73 | f | 0.31 | 0.76 | 1.96 | a | 1.66 | 1.73 | 1.57 | 2.13 | a | 1.26 | b | 0.37 | 0.56 | c | 14.26 | |||||||
| 2005 | 1.51 | c | 0.26 | 0.63 | a | 0.48 | b | 1.38 | 3.61 | 1.00 | 1.84 | 1.27 | 1.52 | 2.11 | a | 0.00 | z | 15.61 | ||||||||
| 2006 | 1.06 | b | 0.36 | d | 0.00 | z | 1.66 | a | 0.94 | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 4.02 | ||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 1.33 | 0.88 | 1.04 | 1.21 | 1.92 | 2.17 | 1.64 | 1.45 | 1.39 | 1.13 | 1.13 | 1.30 | 16.12 | |||||||||||||
| S.D. | 0.66 | 0.47 | 0.56 | 0.69 | 0.83 | 1.10 | 0.86 | 0.80 | 0.94 | 0.65 | 0.62 | 0.76 | 2.72 | |||||||||||||
| SKEW | 0.16 | 0.53 | 1.13 | 0.60 | 0.52 | 1.02 | 0.90 | 0.82 | 0.77 | 0.28 | 0.62 | 1.17 | 0.15 | |||||||||||||
| MAX | 2.69 | 1.92 | 3.07 | 3.23 | 3.83 | 5.78 | 4.30 | 4.03 | 4.04 | 2.75 | 2.64 | 3.81 | 21.09 | |||||||||||||
| MIN | 0.14 | 0.19 | 0.20 | 0.25 | 0.62 | 0.61 | 0.20 | 0.11 | 0.19 | 0.00 | 0.00 | 0.06 | 11.48 | |||||||||||||
| NO YRS | 55 | 55 | 52 | 53 | 54 | 55 | 55 | 57 | 54 | 54 | 55 | 52 | 39 | |||||||||||||