| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1965 | 0.00 | z | 0.00 | z | 0.00 | z | 0.55 | 1.85 | 0.64 | 0.00 | 0.00 | z | 0.00 | z | 0.00 | z | 0.56 | 0.34 | 3.94 | |||||||
| 1966 | 0.47 | b | 0.36 | 0.36 | 0.16 | 0.00 | z | 0.41 | 0.07 | 0.04 | 0.32 | 0.04 | 1.00 | 1.12 | 4.35 | |||||||||||
| 1967 | 0.89 | 0.10 | 0.43 | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.13 | c | 1.46 | 0.15 | 3.16 | ||||||
| 1968 | 0.47 | 1.07 | 0.28 | 0.05 | 0.64 | 0.68 | 0.00 | 1.24 | 0.00 | 0.00 | z | 0.00 | z | 0.61 | 5.04 | |||||||||||
| 1969 | 0.59 | d | 0.00 | z | 0.00 | z | 0.79 | 0.12 | 1.86 | 0.19 | 0.00 | 0.00 | 1.01 | 0.00 | z | 0.00 | z | 4.56 | ||||||||
| 1970 | 1.07 | 0.24 | a | 0.64 | 1.05 | 1.03 | 1.82 | 0.32 | 0.00 | 1.09 | 0.58 | 1.87 | 0.80 | 10.51 | ||||||||||||
| 1971 | 0.57 | 0.35 | 1.09 | 0.62 | 1.76 | 1.31 | 0.19 | 0.05 | 2.17 | 0.71 | 0.66 | 0.64 | 10.12 | |||||||||||||
| 1972 | 1.22 | 1.10 | 0.23 | 0.46 | 0.65 | 0.84 | 0.00 | 0.05 | 0.61 | 0.82 | 0.57 | 1.13 | 7.68 | |||||||||||||
| 1973 | 0.96 | 0.27 | 1.13 | 1.46 | 0.68 | 0.25 | 0.08 | 0.55 | 0.37 | 0.92 | 1.56 | 0.95 | 9.18 | |||||||||||||
| 1974 | 0.64 | 0.18 | 1.49 | 0.69 | 0.10 | 0.00 | 0.52 | 0.14 | 0.00 | 1.62 | 0.37 | 0.39 | 6.14 | |||||||||||||
| 1975 | 0.55 | 0.78 | 0.95 | 1.01 | 0.27 | 0.76 | 0.30 | 1.04 | 0.02 | 1.12 | 0.46 | 0.92 | 8.18 | |||||||||||||
| 1976 | 0.29 | 1.08 | 0.32 | 1.26 | 0.08 | 0.70 | 0.29 | 2.22 | 0.84 | 0.00 | 0.02 | 0.00 | 7.10 | |||||||||||||
| 1977 | 0.36 | 0.24 | 0.49 | 0.11 | 1.23 | 0.45 | 0.21 | 0.85 | 0.37 | 0.16 | 1.37 | 1.70 | 7.54 | |||||||||||||
| 1978 | 1.34 | 1.30 | 0.78 | 1.14 | 0.15 | 0.38 | 0.02 | 0.52 | 1.12 | 0.00 | 0.79 | 0.53 | 8.07 | |||||||||||||
| 1979 | 1.11 | 1.25 | 0.79 | 0.81 | 0.59 | 0.90 | 0.10 | 2.91 | 0.30 | 0.76 | 0.78 | 0.35 | 10.65 | |||||||||||||
| 1980 | 1.05 | 0.85 | 1.25 | 0.83 | 1.27 | 0.25 | 0.20 | 0.00 | 1.47 | 0.24 | 0.25 | 0.34 | 8.00 | |||||||||||||
| 1981 | 0.70 | 0.38 | 0.88 | 0.34 | 1.36 | 0.27 | 0.30 | 0.19 | 0.25 | 1.60 | 2.45 | 1.45 | 10.17 | |||||||||||||
| 1982 | 0.00 | z | 0.15 | 0.00 | b | 0.33 | b | 0.18 | 0.48 | 1.16 | 0.00 | 0.78 | 0.20 | 0.46 | 0.50 | 4.24 | ||||||||||
| 1983 | 0.00 | 0.87 | 1.66 | 1.51 | a | 0.87 | 0.62 | a | 0.78 | 3.47 | 0.59 | 0.58 | 1.00 | a | 3.40 | k | 11.95 | |||||||||
| 1984 | 0.00 | c | 0.45 | c | 1.14 | n | 1.04 | 0.86 | 0.60 | 0.17 | 3.20 | 0.48 | 0.00 | z | 0.00 | z | 2.03 | z | 6.80 | |||||||
| 1985 | 0.02 | a | 0.38 | 1.26 | 0.39 | 1.15 | 0.00 | 0.55 | 0.00 | 0.48 | x | 0.57 | 0.90 | c | 0.00 | z | 5.22 | |||||||||
| 1986 | 0.00 | z | 0.00 | z | 2.47 | 1.70 | z | 0.00 | 0.02 | 0.00 | 0.00 | z | 0.94 | 0.23 | 0.04 | 0.56 | 4.26 | |||||||||
| 1987 | 0.31 | b | 2.38 | 0.51 | c | 6.06 | a | 2.59 | m | 1.09 | 0.15 | 0.00 | z | 0.00 | z | 0.00 | z | 0.07 | c | 0.51 | 11.08 | |||||
| 1988 | 0.00 | z | 0.05 | 0.18 | c | 0.59 | 0.43 | 0.52 | 0.20 | 0.15 | 0.26 | 0.00 | 1.33 | c | 0.37 | 4.08 | ||||||||||
| 1989 | 0.05 | 0.45 | 1.54 | b | 0.55 | a | 1.64 | 0.03 | 0.00 | g | 0.92 | 1.00 | 0.31 | 0.58 | 0.36 | 7.43 | ||||||||||
| 1990 | 0.30 | a | 0.29 | c | 0.36 | 1.51 | 0.76 | b | 0.30 | 0.06 | 1.05 | 0.00 | 0.39 | a | 0.36 | 0.09 | 5.47 | |||||||||
| 1991 | 0.00 | z | 0.05 | 0.65 | c | 2.22 | d | 2.84 | n | 0.72 | 0.00 | 0.03 | 0.62 | c | 0.00 | z | 0.49 | a | 0.04 | a | 4.82 | |||||
| 1992 | 0.00 | 0.42 | 0.56 | 0.00 | z | 0.00 | 0.00 | z | 0.05 | c | 0.52 | 0.00 | 2.04 | b | 0.66 | h | 0.29 | c | 3.88 | |||||||
| 1993 | 1.35 | d | 0.55 | e | 0.93 | j | 0.58 | a | 0.37 | b | 0.03 | f | 0.50 | 1.06 | 0.25 | 0.90 | 0.00 | o | 1.00 | 6.56 | ||||||
| 1994 | 0.01 | 0.90 | c | 0.55 | c | 1.28 | 0.40 | s | 0.00 | 0.01 | 0.00 | 0.00 | 0.02 | 0.93 | 1.52 | 5.22 | ||||||||||
| 1995 | 0.22 | h | 0.12 | c | 0.00 | z | 1.38 | h | 2.37 | d | 0.00 | z | 0.11 | b | 0.00 | 0.00 | 0.00 | 0.00 | z | 0.85 | d | 3.45 | ||||
| 1996 | 1.80 | h | 1.02 | 0.92 | d | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | g | 0.29 | 0.29 | b | 0.42 | a | 0.49 | i | 1.21 | a | 4.15 | |||
| 1997 | 1.49 | f | 0.00 | z | 0.00 | z | 0.00 | z | 0.05 | a | 1.71 | 0.00 | z | 0.00 | 0.08 | c | 0.26 | 0.07 | b | 0.00 | z | 2.17 | ||||
| 1998 | 0.00 | z | 0.90 | g | 0.00 | z | 1.60 | h | 2.73 | 0.00 | z | 0.00 | z | 0.00 | z | 1.69 | 0.84 | 0.82 | b | 0.53 | a | 6.61 | ||||
| 1999 | 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 | |
| 2000 | 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 | |
| 2001 | 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 | 0.29 | 1.01 | a | 1.85 | e | 3.15 | ||
| 2002 | 1.32 | b | 0.23 | 0.50 | c | 0.82 | 0.30 | 0.43 | 0.08 | 0.00 | 0.11 | 0.10 | 0.33 | 0.35 | b | 4.57 | ||||||||||
| 2003 | 1.04 | 0.39 | b | 0.74 | a | 0.82 | 2.10 | a | 0.00 | 0.29 | a | 0.83 | b | 0.18 | 0.49 | 0.62 | 0.00 | z | 7.50 | |||||||
| 2004 | 0.49 | c | 0.15 | d | 1.07 | 0.45 | 0.95 | 0.77 | 0.20 | 0.28 | a | 0.21 | 1.90 | 0.85 | a | 0.63 | 7.95 | |||||||||
| 2005 | 0.64 | c | 0.10 | 0.73 | 1.34 | 3.87 | 0.55 | 0.17 | 0.00 | 0.33 | 0.97 | 0.32 | h | 0.00 | z | 8.70 | ||||||||||
| 2006 | 0.00 | z | 0.84 | 0.87 | e | 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 | 1.71 | ||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 0.61 | 0.57 | 0.80 | 0.99 | 0.95 | 0.61 | 0.22 | 0.65 | 0.49 | 0.59 | 0.78 | 0.69 | 8.09 | |||||||||||||
| S.D. | 0.45 | 0.50 | 0.51 | 1.06 | 0.90 | 0.51 | 0.25 | 0.96 | 0.53 | 0.56 | 0.56 | 0.48 | 1.82 | |||||||||||||
| SKEW | 0.15 | 1.59 | 1.16 | 3.69 | 1.35 | 1.04 | 2.05 | 1.78 | 1.40 | 1.05 | 1.02 | 0.78 | -0.25 | |||||||||||||
| MAX | 1.35 | 2.38 | 2.47 | 6.06 | 3.87 | 1.86 | 1.16 | 3.47 | 2.17 | 2.04 | 2.45 | 1.85 | 10.65 | |||||||||||||
| MIN | 0.00 | 0.05 | 0.00 | 0.05 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.02 | 0.00 | 4.57 | |||||||||||||
| NO YRS | 29 | 34 | 32 | 31 | 32 | 32 | 33 | 33 | 34 | 34 | 31 | 32 | 15 | |||||||||||||