| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1978 | 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 | 0.01 | 1.30 | 1.12 | 2.43 | ||||
| 1979 | 1.36 | 1.01 | 1.27 | 1.85 | 1.60 | 0.16 | 0.10 | 1.50 | 0.05 | 0.98 | 1.37 | 0.72 | 11.97 | |||||||||||||
| 1980 | 0.80 | 0.75 | 1.16 | 0.22 | 2.00 | 2.32 | 0.66 | 0.01 | 0.96 | 0.42 | 0.58 | 0.88 | i | 9.88 | ||||||||||||
| 1981 | 0.59 | 0.87 | 2.17 | 1.28 | 3.49 | 0.74 | 0.43 | 0.00 | 0.82 | 0.60 | 2.07 | 2.24 | 15.30 | |||||||||||||
| 1982 | 0.56 | 0.81 | a | 1.57 | 0.67 | 0.73 | 2.52 | 1.26 | 0.17 | 1.44 | 1.93 | 0.38 | 1.54 | c | 13.58 | |||||||||||
| 1983 | 0.65 | 1.48 | c | 1.94 | 1.79 | 2.34 | 1.62 | 0.49 | 1.25 | 0.09 | 1.32 | 0.68 | k | 2.74 | j | 12.97 | ||||||||||
| 1984 | 0.26 | l | 0.63 | e | 2.22 | b | 1.94 | 1.62 | 2.05 | 0.26 | 3.28 | 0.31 | 1.48 | 1.72 | j | 0.55 | 14.34 | |||||||||
| 1985 | 0.31 | b | 0.70 | c | 0.47 | f | 0.39 | 2.17 | a | 0.22 | 0.35 | 0.47 | 0.43 | 0.44 | 1.81 | g | 0.34 | d | 5.82 | |||||||
| 1986 | 0.80 | d | 2.11 | h | 0.60 | 0.95 | 1.20 | 0.29 | c | 0.35 | 0.12 | 0.91 | 0.36 | 1.37 | e | 0.20 | 7.15 | |||||||||
| 1987 | 0.95 | 0.75 | h | 1.42 | f | 0.80 | 1.36 | 0.76 | 2.09 | 0.27 | 0.00 | 0.00 | a | 0.60 | g | 0.97 | b | 7.20 | ||||||||
| 1988 | 0.62 | 0.09 | 0.54 | 2.10 | 0.74 | 0.84 | 0.00 | 2.21 | 0.11 | 0.00 | 1.38 | d | 0.66 | a | 9.29 | |||||||||||
| 1989 | 0.91 | 0.82 | 1.68 | 1.51 | 3.28 | 0.60 | 0.24 | 0.97 | 0.52 | 0.69 | 0.31 | 0.23 | a | 11.76 | ||||||||||||
| 1990 | 0.95 | c | 0.23 | 0.77 | 1.32 | 1.29 | 0.78 | 0.05 | 0.97 | 0.07 | 0.85 | 1.07 | 0.53 | 8.88 | ||||||||||||
| 1991 | 0.35 | 0.69 | 1.25 | 0.98 | 2.32 | 2.48 | 0.30 | 0.00 | z | 0.00 | 0.61 | 2.05 | b | 0.49 | c | 11.52 | ||||||||||
| 1992 | 0.00 | z | 0.33 | c | 0.82 | a | 0.00 | z | 0.57 | 1.24 | 2.91 | 0.11 | 0.20 | 0.66 | 1.29 | b | 1.07 | f | 8.13 | |||||||
| 1993 | 1.52 | j | 0.74 | b | 1.59 | 1.62 | e | 1.91 | b | 1.64 | 2.03 | 0.69 | 0.01 | 0.67 | a | 0.24 | b | 0.41 | d | 11.55 | ||||||
| 1994 | 0.10 | c | 0.65 | f | 1.11 | 1.89 | 2.11 | b | 1.87 | 0.35 | 0.00 | 0.30 | 0.58 | c | 0.96 | f | 0.32 | c | 8.63 | |||||||
| 1995 | 1.34 | g | 0.64 | b | 1.32 | b | 2.21 | c | 1.86 | b | 0.00 | z | 0.31 | 0.28 | 0.19 | 0.41 | a | 2.21 | d | 0.87 | r | 9.43 | ||||
| 1996 | 0.45 | k | 0.47 | 0.52 | 1.35 | 2.35 | 1.13 | 0.52 | 0.48 | 0.52 | a | 1.26 | a | 1.76 | b | 2.11 | c | 12.47 | ||||||||
| 1997 | 1.92 | b | 0.45 | 0.43 | a | 1.61 | 0.81 | 1.57 | 1.35 | 0.18 | 0.42 | 0.26 | 0.67 | a | 0.23 | d | 9.90 | |||||||||
| 1998 | 1.36 | f | 0.62 | h | 0.90 | 1.05 | 4.28 | 1.51 | 1.12 | 0.02 | 0.58 | 0.22 | 2.40 | c | 1.28 | f | 12.08 | |||||||||
| 1999 | 1.05 | e | 1.16 | h | 0.83 | 0.63 | 0.80 | 0.00 | z | 0.19 | 0.78 | 0.00 | 0.89 | 0.76 | 0.52 | b | 6.45 | |||||||||
| 2000 | 1.05 | l | 1.10 | b | 1.89 | b | 0.80 | 1.03 | a | 0.66 | 0.63 | 0.00 | 0.95 | 1.23 | 0.50 | 0.47 | a | 9.26 | ||||||||
| 2001 | 0.67 | 0.35 | 1.06 | a | 1.57 | 0.15 | 1.31 | 1.30 | 0.11 | 0.53 | 0.83 | 1.13 | a | 1.05 | k | 9.01 | ||||||||||
| 2002 | 0.55 | i | 0.10 | a | 0.44 | 0.78 | 0.74 | e | 1.13 | 0.03 | 0.77 | 0.17 | 0.37 | 0.09 | b | 1.22 | g | 4.62 | ||||||||
| 2003 | 1.30 | h | 0.83 | f | 1.12 | 0.00 | z | 1.65 | 0.06 | 0.16 | 0.75 | 0.52 | a | 0.44 | 0.00 | z | 2.10 | m | 4.70 | |||||||
| 2004 | 1.78 | f | 1.20 | g | 0.82 | 1.15 | 3.87 | 0.57 | a | 0.10 | 1.14 | 0.18 | b | 1.44 | a | 0.67 | a | 1.23 | 11.17 | |||||||
| 2005 | 0.33 | b | 0.36 | 0.49 | 1.75 | 2.93 | 0.77 | 0.18 | 0.01 | 0.08 | 1.98 | 1.73 | a | 1.03 | c | 11.64 | ||||||||||
| 2006 | 1.37 | a | 0.49 | 1.33 | 0.57 | 1.61 | b | 1.28 | 0.23 | 0.55 | 0.10 | 0.54 | 1.24 | b | 0.73 | c | 10.04 | |||||||||
| 2007 | 0.19 | g | 2.61 | d | 0.97 | c | 1.67 | f | 0.20 | c | 1.10 | b | 0.00 | 0.28 | a | 0.49 | b | 1.19 | c | 1.17 | 0.62 | d | 8.63 | |||
| 2008 | 1.03 | g | 0.12 | d | 0.82 | b | 0.57 | 1.01 | a | 0.70 | 0.08 | d | 0.36 | c | 0.19 | 0.13 | c | 1.08 | a | 0.78 | b | 5.84 | ||||
| 2009 | 0.67 | a | 0.50 | b | 0.79 | c | 0.89 | 1.01 | 1.18 | b | 0.00 | 1.08 | 0.09 | a | 1.13 | a | 0.59 | f | 0.15 | 7.49 | ||||||
| 2010 | 1.52 | b | 0.20 | a | 0.28 | b | 1.28 | 2.51 | 1.70 | b | 0.53 | a | 0.27 | a | 1.10 | a | 0.99 | e | 0.96 | g | 1.21 | i | 10.38 | |||
| 2011 | 0.99 | c | 0.24 | c | 0.80 | 0.84 | g | 1.55 | i | 1.13 | e | 0.22 | i | 0.25 | a | 0.00 | c | 0.58 | d | 0.50 | f | 0.44 | j | 3.99 | ||
| 2012 | 1.33 | b | 0.26 | f | 0.83 | i | 1.26 | b | 0.45 | c | 1.36 | b | 0.96 | c | 0.00 | c | 0.01 | e | 0.87 | j | 0.63 | m | 1.45 | k | 5.37 | |
| 2013 | 1.36 | i | 0.30 | d | 0.06 | 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 | 0.30 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 0.85 | 0.63 | 1.08 | 1.23 | 1.70 | 1.17 | 0.59 | 0.59 | 0.36 | 0.75 | 1.15 | 0.76 | 11.37 | |||||||||||||
| S.D. | 0.44 | 0.52 | 0.52 | 0.53 | 1.04 | 0.65 | 0.69 | 0.71 | 0.37 | 0.51 | 0.64 | 0.56 | 2.10 | |||||||||||||
| SKEW | 0.53 | 2.20 | 0.62 | 0.04 | 0.70 | 0.36 | 1.75 | 2.08 | 1.13 | 0.64 | 0.21 | 1.38 | 0.59 | |||||||||||||
| MAX | 1.92 | 2.61 | 2.22 | 2.21 | 4.28 | 2.52 | 2.91 | 3.28 | 1.44 | 1.98 | 2.40 | 2.24 | 15.30 | |||||||||||||
| MIN | 0.10 | 0.09 | 0.28 | 0.22 | 0.15 | 0.06 | 0.00 | 0.00 | 0.00 | 0.00 | 0.09 | 0.15 | 8.88 | |||||||||||||
| NO YRS | 22 | 27 | 31 | 30 | 33 | 32 | 33 | 33 | 34 | 34 | 25 | 24 | 9 | |||||||||||||