| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1955 | 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 | 1.12 | o | 3.04 | 3.04 | ||
| 1956 | 1.62 | 1.09 | 0.00 | 0.02 | 1.48 | 0.57 | 0.71 | 0.14 | 0.12 | 2.77 | 0.26 | 0.39 | 9.17 | |||||||||||||
| 1957 | 0.89 | 1.47 | 0.00 | z | 0.41 | 1.79 | 1.12 | 0.06 | 0.42 | 0.09 | 2.13 | a | 0.25 | a | 2.11 | 10.74 | ||||||||||
| 1958 | 2.20 | 1.62 | 1.24 | 1.72 | 0.77 | 0.00 | z | 0.00 | z | 0.00 | z | 0.43 | 0.05 | 0.21 | 0.88 | 9.12 | ||||||||||
| 1959 | 1.66 | 0.64 | 1.15 | 0.90 | 1.02 | 0.02 | 0.00 | 0.71 | 2.09 | 0.60 | 0.27 | 0.81 | 9.87 | |||||||||||||
| 1960 | 1.07 | 1.16 | v | 1.06 | 0.21 | 1.75 | 0.00 | 0.18 | 0.32 | 0.96 | 0.31 | b | 2.33 | 0.21 | 8.40 | |||||||||||
| 1961 | 0.32 | 0.56 | 1.15 | 0.18 | 1.01 | 0.45 | 0.00 | 0.16 | 0.78 | 0.60 | 0.84 | 0.96 | 7.01 | |||||||||||||
| 1962 | 0.13 | e | 1.73 | 0.59 | 1.04 | 1.87 | 0.05 | 0.10 | 0.00 | 0.37 | 1.94 | 1.51 | 1.35 | 10.68 | ||||||||||||
| 1963 | 0.63 | 1.28 | 0.50 | 2.48 | 1.36 | 1.28 | 0.00 | 0.19 | 0.79 | 0.26 | 1.66 | 1.07 | 11.50 | |||||||||||||
| 1964 | 1.66 | 0.20 | 0.20 | n | 0.00 | z | 0.85 | 0.00 | z | 0.51 | 0.66 | 0.33 | 0.18 | 0.62 | 4.28 | 9.29 | ||||||||||
| 1965 | 3.09 | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 2.00 | 1.13 | 3.27 | 0.33 | 0.10 | 1.95 | 0.49 | 12.36 | |||||||||
| 1966 | 0.44 | 0.90 | 1.21 | 0.30 | 0.40 | 0.62 | 0.26 | 0.28 | 0.88 | 0.35 | 2.08 | 2.17 | 9.89 | |||||||||||||
| 1967 | 1.43 | b | 0.07 | 1.01 | 0.35 | q | 0.75 | d | 1.36 | 0.19 | 0.05 | 0.42 | 1.50 | 0.59 | 1.44 | 8.81 | ||||||||||
| 1968 | 1.59 | 1.14 | 0.07 | 0.07 | 0.94 | 0.65 | 0.28 | 2.14 | 0.07 | 1.07 | 0.00 | z | 0.00 | z | 8.02 | |||||||||||
| 1969 | 2.29 | b | 1.30 | e | 0.08 | i | 0.40 | 0.50 | 2.25 | 0.03 | 0.00 | 0.55 | 0.53 | 0.08 | 3.33 | 11.26 | ||||||||||
| 1970 | 3.74 | 0.07 | a | 1.34 | 0.00 | b | 1.94 | 0.87 | 0.10 | 0.03 | 0.49 | 1.20 | 1.87 | 2.43 | b | 14.08 | ||||||||||
| 1971 | 2.63 | 0.05 | 1.48 | 0.23 | 1.00 | 1.28 | 0.06 | 0.55 | 0.71 | 0.62 | 0.94 | 2.43 | 11.98 | |||||||||||||
| 1972 | 0.47 | 0.32 | 1.08 | 0.34 | 0.50 | 1.65 | 0.27 | 0.00 | 0.66 | 0.32 | 0.00 | z | 0.00 | z | 5.61 | |||||||||||
| 1973 | 1.33 | 0.03 | p | 0.06 | 0.15 | 1.12 | 0.20 | 0.29 | 0.17 | 0.49 | 0.81 | 4.16 | 2.64 | a | 11.42 | |||||||||||
| 1974 | 1.36 | 0.48 | 1.24 | 0.00 | 0.20 | 0.21 | 1.93 | 0.45 | 0.00 | 0.45 | 0.27 | 2.10 | 8.69 | |||||||||||||
| 1975 | 1.30 | 1.91 | 1.23 | 1.73 | 0.34 | 2.04 | 0.75 | 0.45 | 0.09 | 1.10 | 0.59 | 0.98 | 12.51 | |||||||||||||
| 1976 | 1.04 | 0.79 | 0.59 | 0.35 | m | 0.37 | 0.56 | 1.26 | 2.47 | 0.66 | 0.06 | 0.23 | 0.09 | 8.12 | ||||||||||||
| 1977 | 0.28 | 0.56 | 0.31 | 0.01 | 1.70 | 1.08 | 0.15 | 1.15 | 0.93 | 0.26 | 1.67 | 1.90 | 10.00 | |||||||||||||
| 1978 | 2.36 | 1.51 | 0.63 | 2.08 | 1.06 | 0.36 | 0.16 | 0.24 | 1.14 | 0.00 | 0.60 | a | 0.81 | 10.95 | ||||||||||||
| 1979 | 1.57 | 1.58 | 0.89 | 0.88 | 1.08 | 0.43 | 0.12 | 0.92 | 0.41 | 1.03 | 1.53 | 2.11 | 12.55 | |||||||||||||
| 1980 | 1.19 | 1.93 | 0.39 | 0.91 | 2.11 | 2.04 | 0.13 | 0.03 | 1.49 | 0.47 | 0.71 | 2.31 | 13.71 | |||||||||||||
| 1981 | 1.72 | 0.93 | 0.82 | 0.80 | 2.18 | 0.57 | 0.35 | 0.00 | 0.42 | 0.93 | 3.15 | 3.33 | 15.20 | |||||||||||||
| 1982 | 0.00 | z | 1.15 | 0.70 | 0.93 | 1.10 | 1.73 | 2.33 | 0.31 | 1.03 | 1.36 | d | 1.04 | 2.95 | a | 14.63 | ||||||||||
| 1983 | 1.26 | e | 2.46 | 2.48 | a | 1.58 | 0.34 | 1.00 | 0.66 | a | 0.84 | 0.21 | 0.30 | 3.29 | b | 3.40 | i | 14.42 | ||||||||
| 1984 | 0.02 | 1.19 | a | 1.30 | l | 0.83 | c | 0.95 | 0.82 | 0.63 | 2.57 | a | 0.32 | 0.53 | 2.48 | f | 1.27 | e | 9.13 | |||||||
| 1985 | 0.06 | 1.12 | b | 0.74 | d | 0.33 | 1.68 | 0.98 | 0.56 | 1.17 | 0.04 | k | 0.42 | 1.36 | c | 1.03 | a | 9.45 | ||||||||
| 1986 | 2.18 | c | 1.55 | c | 1.12 | a | 0.75 | b | 0.57 | 0.40 | 0.00 | 0.43 | 1.59 | a | 0.74 | 0.45 | a | 0.36 | 10.14 | |||||||
| 1987 | 1.70 | b | 1.10 | e | 0.83 | a | 0.25 | 1.13 | 0.79 | 0.52 | 0.17 | 0.03 | 0.00 | 1.37 | 1.96 | 9.85 | ||||||||||
| 1988 | 1.14 | 0.05 | a | 0.84 | g | 0.64 | 0.36 | 1.38 | 0.00 | 0.34 | 0.19 | 0.00 | 3.19 | e | 1.44 | 8.73 | ||||||||||
| 1989 | 0.83 | a | 1.02 | b | 2.15 | a | 0.95 | 1.43 | 0.42 | 0.23 | 2.64 | 0.84 | 0.72 | h | 0.55 | a | 0.05 | 11.11 | ||||||||
| 1990 | 0.89 | 0.59 | 0.74 | 1.48 | 1.34 | 0.96 | a | 0.22 | 1.31 | 0.40 | 0.51 | 0.45 | 0.70 | a | 9.59 | |||||||||||
| 1991 | 0.63 | 0.24 | a | 1.56 | a | 0.49 | 2.96 | 1.23 | 0.48 | 0.00 | 0.70 | 0.59 | 1.56 | 0.70 | 11.14 | |||||||||||
| 1992 | 0.89 | 1.01 | a | 1.01 | b | 0.91 | 0.15 | a | 1.57 | g | 1.53 | 0.36 | 0.36 | 0.92 | 1.71 | a | 2.78 | b | 11.63 | |||||||
| 1993 | 3.67 | b | 1.45 | d | 0.99 | d | 1.40 | 0.78 | v | 1.52 | 1.00 | 0.83 | 0.03 | 0.80 | 0.26 | 1.21 | d | 13.16 | ||||||||
| 1994 | 0.28 | b | 1.17 | b | 0.04 | 1.24 | a | 1.25 | b | 0.27 | 0.30 | 0.14 | 0.03 | o | 0.00 | z | 0.64 | y | 0.74 | q | 4.69 | |||||
| 1995 | 3.12 | r | 0.97 | e | 2.05 | d | 1.54 | b | 1.92 | a | 1.16 | 1.37 | 2.10 | 0.07 | 0.63 | 1.06 | k | 1.14 | z | 11.81 | ||||||
| 1996 | 1.23 | l | 0.69 | g | 1.81 | c | 1.21 | f | 2.04 | e | 0.95 | b | 0.33 | 0.30 | 0.22 | 0.44 | b | 2.87 | c | 4.65 | i | 8.96 | ||||
| 1997 | 1.55 | c | 0.00 | b | 0.48 | d | 0.45 | b | 1.27 | 1.25 | 1.52 | 0.54 | 0.22 | 0.42 | 0.94 | 0.69 | a | 9.33 | ||||||||
| 1998 | 2.58 | i | 2.26 | m | 0.94 | j | 1.68 | i | 3.73 | j | 1.93 | g | 1.76 | 0.12 | 2.09 | 0.03 | 2.83 | c | 0.83 | a | 7.66 | |||||
| 1999 | 1.85 | b | 3.17 | i | 0.25 | i | 0.41 | 0.67 | 0.75 | 0.00 | 0.80 | 0.00 | 0.82 | 0.49 | 1.19 | d | 6.98 | |||||||||
| 2000 | 1.44 | c | 2.59 | d | 0.66 | c | 0.94 | 0.53 | 0.40 | a | 0.36 | 0.24 | 0.46 | 2.06 | 0.33 | b | 0.58 | b | 10.59 | |||||||
| 2001 | 0.79 | c | 0.49 | b | 0.26 | b | 0.00 | z | 0.71 | 0.55 | a | 0.66 | 0.20 | 0.76 | 0.75 | a | 1.94 | a | 2.00 | i | 7.11 | |||||
| 2002 | 0.90 | a | 0.00 | z | 0.28 | p | 0.96 | 0.15 | 0.65 | 0.40 | 0.43 | 0.36 | 0.04 | 0.63 | 2.22 | f | 4.52 | |||||||||
| 2003 | 1.05 | b | 0.43 | a | 0.64 | 1.27 | 1.72 | 0.83 | 0.60 | 0.45 | 0.11 | 0.10 | 0.44 | b | 1.41 | d | 9.05 | |||||||||
| 2004 | 1.78 | g | 1.80 | a | 0.49 | a | 0.48 | 1.70 | 0.68 | 0.15 | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 5.30 | |||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 1.34 | 1.01 | 0.92 | 0.78 | 1.13 | 0.90 | 0.51 | 0.66 | 0.56 | 0.68 | 1.26 | 1.53 | 10.79 | |||||||||||||
| S.D. | 0.87 | 0.65 | 0.57 | 0.61 | 0.64 | 0.57 | 0.56 | 0.80 | 0.50 | 0.62 | 1.03 | 1.02 | 1.93 | |||||||||||||
| SKEW | 0.87 | 0.32 | 0.65 | 0.77 | 0.47 | 0.58 | 1.50 | 1.76 | 1.46 | 1.46 | 0.99 | 0.66 | 0.52 | |||||||||||||
| MAX | 3.74 | 2.59 | 2.48 | 2.48 | 2.96 | 2.25 | 2.33 | 3.27 | 2.09 | 2.77 | 4.16 | 4.28 | 15.20 | |||||||||||||
| MIN | 0.02 | 0.00 | 0.00 | 0.00 | 0.15 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.08 | 0.05 | 7.01 | |||||||||||||
| NO YRS | 44 | 42 | 40 | 42 | 46 | 45 | 48 | 47 | 46 | 46 | 43 | 41 | 22 | |||||||||||||