| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1971 | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.19 | k | 0.88 | 0.43 | 0.91 | 1.33 | 3.55 | |||||
| 1972 | 0.48 | 0.49 | 0.40 | 0.02 | 1.99 | 1.79 | 0.06 | 0.01 | 0.04 | 0.22 | 0.60 | 1.30 | 7.40 | |||||||||||||
| 1973 | 0.87 | 0.41 | 0.19 | 0.21 | 0.42 | 0.03 | 0.03 | 0.01 | 0.62 | 0.68 | 3.43 | 2.76 | 9.66 | |||||||||||||
| 1974 | 0.79 | 0.69 | 0.88 | 1.20 | 0.20 | 0.13 | 0.25 | 0.00 | 0.00 | 0.41 | 0.55 | 1.18 | 6.28 | |||||||||||||
| 1975 | 1.85 | 0.97 | 0.35 | 0.56 | 0.11 | 0.12 | 0.37 | 1.05 | 0.00 | 0.82 | 0.53 | 0.98 | 7.71 | |||||||||||||
| 1976 | 0.88 | 0.58 | 0.42 | 0.71 | 0.10 | 0.13 | 0.23 | 0.94 | 0.46 | 0.08 | 0.50 | 0.15 | 5.18 | |||||||||||||
| 1977 | 0.10 | 0.57 | 0.65 | 0.02 | 0.86 | 0.16 | 0.09 | 1.01 | 0.82 | 0.50 | 1.34 | 2.62 | 8.74 | |||||||||||||
| 1978 | 2.40 | 0.91 | 0.47 | 1.49 | 0.48 | 0.26 | 0.82 | 1.07 | 0.14 | 0.02 | 1.40 | 1.13 | 10.59 | |||||||||||||
| 1979 | 1.28 | 0.60 | 0.69 | 1.12 | 0.21 | 0.02 | 0.36 | 0.50 | 0.06 | 1.00 | 1.65 | 0.48 | 7.97 | |||||||||||||
| 1980 | 2.87 | 1.20 | 0.60 | 0.62 | 1.06 | 1.23 | 0.00 | 0.20 | 0.30 | 0.40 | 0.99 | 1.71 | 11.18 | |||||||||||||
| 1981 | 1.22 | 0.91 | 0.20 | 0.11 | 1.20 | 1.19 | 0.00 | 0.00 | 0.70 | 0.44 | 1.06 | 2.59 | 9.62 | |||||||||||||
| 1982 | 0.71 | 0.51 | a | 0.70 | 1.00 | 0.89 | 0.94 | 0.35 | 0.15 | 2.35 | 1.81 | 0.46 | 1.67 | 11.54 | ||||||||||||
| 1983 | 1.49 | 1.76 | 1.38 | 0.85 | 0.59 | 0.27 | 1.14 | 0.77 | 0.24 | 0.59 | 1.88 | 1.96 | 12.92 | |||||||||||||
| 1984 | 0.47 | 1.06 | 1.43 | 0.63 | 0.36 | 0.55 | 0.00 | 0.00 | 0.99 | 0.36 | 2.53 | 0.32 | 8.70 | |||||||||||||
| 1985 | 0.18 | 0.74 | 0.46 | 0.77 | 0.30 | 0.69 | 0.00 | 0.30 | 0.99 | 0.68 | 1.32 | 0.48 | 6.91 | |||||||||||||
| 1986 | 1.15 | 1.52 | 0.82 | 0.14 | 0.72 | 0.08 | 0.63 | 0.14 | 1.19 | 0.78 | 1.38 | 1.31 | 9.86 | |||||||||||||
| 1987 | 1.71 | 0.48 | 1.12 | 0.15 | 0.16 | 0.11 | 0.00 | 0.04 | 0.02 | 0.01 | 0.33 | 1.97 | 6.10 | |||||||||||||
| 1988 | 1.50 | 0.01 | 0.93 | 2.86 | 0.74 | 0.51 | 0.26 | a | 0.00 | 0.43 | 0.00 | 1.84 | 0.15 | 9.23 | ||||||||||||
| 1989 | 0.59 | 0.48 | 1.58 | 1.22 | 0.45 | 0.03 | 0.08 | 0.45 | 0.02 | 0.40 | 1.49 | 0.47 | 7.26 | |||||||||||||
| 1990 | 1.19 | 0.00 | z | 0.57 | 1.11 | 0.74 | 0.09 | 0.07 | 0.88 | 0.00 | 0.94 | 0.45 | 0.32 | a | 6.36 | |||||||||||
| 1991 | 0.35 | a | 0.79 | 1.14 | 0.14 | 0.80 | 0.36 | 0.04 | 0.08 | 0.01 | 0.29 | a | 2.01 | b | 0.56 | 6.57 | ||||||||||
| 1992 | 0.66 | 1.45 | 0.29 | 1.27 | 0.08 | 0.53 | 0.70 | 0.89 | 0.31 | 0.67 | 1.11 | 1.03 | b | 8.99 | ||||||||||||
| 1993 | 1.38 | 1.34 | 1.11 | a | 0.93 | 0.62 | a | 0.52 | 0.16 | 0.19 | 0.00 | 0.00 | 0.23 | 0.55 | 7.03 | |||||||||||
| 1994 | 0.61 | 1.22 | 0.32 | 0.30 | 1.35 | 0.23 | 0.21 | 0.00 | 0.03 | 0.96 | 1.56 | 1.12 | 7.91 | |||||||||||||
| 1995 | 2.86 | 0.37 | a | 0.88 | 0.57 | e | 0.00 | z | 0.88 | 0.77 | 0.02 | 0.36 | 0.27 | 1.08 | 1.88 | a | 9.94 | |||||||||
| 1996 | 1.38 | e | 1.14 | f | 0.00 | z | 1.30 | 0.81 | 0.00 | z | 0.11 | 0.00 | 0.15 | 0.87 | 0.42 | a | 2.53 | d | 7.57 | |||||||
| 1997 | 1.23 | a | 0.68 | 1.18 | 0.80 | a | 0.30 | a | 0.64 | 0.00 | z | 0.19 | 0.87 | 1.83 | 1.76 | 0.76 | 10.24 | |||||||||
| 1998 | 1.97 | a | 3.42 | 0.43 | 0.31 | 1.22 | 0.00 | z | 1.10 | 0.01 | 0.15 | 0.17 | 1.95 | 1.31 | 12.04 | |||||||||||
| 1999 | 1.22 | 0.89 | 0.10 | 0.05 | 0.34 | 0.03 | 0.00 | 0.20 | 0.00 | 0.73 | 0.85 | 0.63 | 5.04 | |||||||||||||
| 2000 | 1.37 | 1.53 | 0.82 | 0.02 | 0.48 | 0.33 | 0.00 | 0.00 | 0.49 | 1.03 | 0.84 | 0.48 | b | 7.39 | ||||||||||||
| 2001 | 0.51 | 0.31 | 0.56 | 0.70 | 0.10 | 0.29 | 0.11 | 0.25 | 0.00 | 0.59 | 1.59 | 0.77 | 5.78 | |||||||||||||
| 2002 | 0.39 | 0.75 | 0.56 | 0.32 | 0.40 | 0.73 | 0.11 | 0.01 | 0.05 | 0.19 | 0.23 | 2.72 | 6.46 | |||||||||||||
| 2003 | 1.95 | 0.87 | 0.34 | 0.56 | 0.26 | a | 0.00 | 0.00 | 0.60 | 0.50 | 0.21 | 0.34 | a | 2.00 | 7.63 | |||||||||||
| 2004 | 1.53 | 0.60 | 0.16 | 0.11 | b | 1.36 | 0.89 | 0.00 | 0.67 | 0.19 | 1.08 | 0.14 | 0.94 | 7.67 | ||||||||||||
| 2005 | 0.78 | a | 0.00 | 0.76 | 0.56 | 0.71 | 0.08 | 0.09 | 0.00 | 0.00 | 0.69 | 1.85 | 2.50 | a | 8.02 | |||||||||||
| 2006 | 2.76 | 0.45 | 0.71 | 0.00 | z | 1.84 | 1.04 | 0.00 | 0.00 | 0.48 | 1.06 | 1.58 | 1.60 | 11.52 | ||||||||||||
| 2007 | 0.32 | 0.88 | 0.44 | 0.97 | 0.20 | 1.00 | 0.04 | 0.58 | 0.03 | 0.74 | 1.47 | 1.79 | 8.46 | |||||||||||||
| 2008 | 1.63 | 0.49 | 0.37 | 0.20 | 0.46 | 0.56 | 0.00 | 0.10 | 0.08 | 0.10 | 0.69 | 1.04 | b | 5.72 | ||||||||||||
| 2009 | 1.24 | 0.92 | 1.20 | 0.20 | a | 1.74 | 0.00 | 0.00 | 0.00 | 0.00 | 1.18 | 0.20 | 1.03 | 7.71 | ||||||||||||
| 2010 | 2.05 | 0.72 | 0.24 | 0.00 | z | 1.59 | 1.94 | 0.02 | 0.14 | 1.53 | 0.89 | 0.89 | 2.81 | 12.82 | ||||||||||||
| 2011 | 0.89 | v | 0.40 | z | 1.45 | n | 0.30 | z | 0.99 | x | 1.18 | z | 0.00 | z | 0.00 | z | 0.04 | z | 0.54 | v | 0.35 | v | 0.15 | z | 0.00 | |
| 2012 | 1.03 | y | 0.52 | t | 1.25 | s | 0.72 | u | 0.22 | z | 2.22 | v | 0.30 | z | 0.00 | 0.00 | z | 1.35 | 0.00 | z | 1.88 | 3.23 | ||||
| 2013 | 0.62 | 0.13 | 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 | 0.75 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 1.21 | 0.83 | 0.67 | 0.65 | 0.69 | 0.50 | 0.22 | 0.29 | 0.39 | 0.62 | 1.14 | 1.34 | 8.04 | |||||||||||||
| S.D. | 0.73 | 0.60 | 0.38 | 0.57 | 0.52 | 0.49 | 0.31 | 0.36 | 0.50 | 0.45 | 0.72 | 0.80 | 1.86 | |||||||||||||
| SKEW | 0.65 | 2.22 | 0.62 | 1.58 | 0.93 | 1.23 | 1.71 | 1.04 | 1.91 | 0.75 | 0.82 | 0.38 | 0.64 | |||||||||||||
| MAX | 2.87 | 3.42 | 1.58 | 2.86 | 1.99 | 1.94 | 1.14 | 1.07 | 2.35 | 1.83 | 3.43 | 2.81 | 12.92 | |||||||||||||
| MIN | 0.10 | 0.00 | 0.10 | 0.02 | 0.08 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.14 | 0.15 | 5.04 | |||||||||||||
| NO YRS | 40 | 38 | 38 | 37 | 38 | 37 | 38 | 40 | 40 | 41 | 40 | 41 | 32 | |||||||||||||