| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1970 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 1.12 | f | ----- | z | ----- | z | 0.00 | l |
| 1971 | 0.00 | a | 1.35 | ----- | z | 0.40 | 0.95 | 0.44 | i | 1.13 | w | 1.80 | 2.06 | ----- | z | ----- | z | ----- | z | 6.56 | f | |||||
| 1972 | ----- | z | 0.00 | 0.00 | d | 0.00 | a | ----- | z | 1.70 | 1.40 | 2.16 | 1.51 | b | 0.00 | l | ----- | z | ----- | z | 6.77 | e | ||||
| 1973 | ----- | z | 0.00 | ----- | z | 0.40 | 0.50 | 0.80 | ----- | z | 2.30 | 4.52 | 0.20 | d | 0.00 | d | 0.10 | c | 8.82 | c | ||||||
| 1974 | 0.00 | a | 1.25 | 0.10 | 0.11 | 0.36 | 5.25 | 1.06 | 0.90 | ----- | z | 0.12 | c | 1.60 | 0.34 | 11.09 | a | |||||||||
| 1975 | 0.63 | 0.31 | 0.30 | 0.26 | ----- | z | 1.60 | 0.46 | 2.96 | 2.67 | 0.46 | 0.53 | 0.54 | 10.72 | a | |||||||||||
| 1976 | 0.40 | 0.77 | 0.52 | 0.01 | 1.96 | 1.89 | 2.12 | 1.63 | 2.35 | 1.61 | 1.16 | 0.32 | 14.74 | |||||||||||||
| 1977 | 0.38 | 0.50 | 0.56 | ----- | z | 1.63 | 1.29 | 3.75 | 2.90 | 3.33 | a | 1.36 | 0.21 | 0.81 | 16.72 | a | ||||||||||
| 1978 | 0.50 | 0.62 | 0.72 | 0.21 | 0.00 | 3.68 | 1.23 | 1.33 | 2.06 | 1.08 | 1.06 | 0.67 | 13.16 | |||||||||||||
| 1979 | 0.15 | 0.02 | 0.46 | 0.43 | 0.16 | 1.45 | 1.31 | 1.54 | 1.12 | 1.70 | 1.28 | 0.31 | 9.93 | |||||||||||||
| 1980 | 0.47 | 0.50 | 0.07 | 0.22 | 0.66 | 3.41 | 2.75 | 2.30 | ----- | z | ----- | z | ----- | z | ----- | z | 10.38 | d | ||||||||
| 1981 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 1982 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 1983 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 1984 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 1985 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 1986 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 1987 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 1988 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 1989 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 1990 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 1991 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 1992 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 1993 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 1994 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 1995 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 1996 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 1997 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 1998 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 1999 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | f | ----- | z | 0.00 | j | 0.00 | l |
| 2000 | 0.00 | g | 0.00 | e | 0.00 | d | 0.00 | a | 0.00 | ----- | z | ----- | z | ----- | z | 1.20 | b | 0.00 | h | 0.00 | f | 0.00 | f | 1.20 | g | |
| 2001 | 0.00 | e | 0.00 | f | 0.00 | g | 0.00 | d | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | j |
| 2002 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 2003 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 2004 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 2005 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 2006 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 2007 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 2008 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 2009 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 2010 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 2011 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 2012 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 2013 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 2014 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 2015 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 2016 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 2017 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 0.28 | 0.48 | 0.30 | 0.19 | 0.69 | 2.34 | 1.76 | 1.98 | 2.31 | 0.93 | 0.83 | 0.44 | 12.61 | |||||||||||||
| S.D. | 0.25 | 0.49 | 0.27 | 0.17 | 0.70 | 1.45 | 1.06 | 0.67 | 1.09 | 0.67 | 0.59 | 0.24 | 2.45 | |||||||||||||
| SKEW | -0.06 | 0.61 | 0.17 | 0.20 | 0.78 | 0.95 | 0.78 | 0.04 | 0.85 | -0.12 | -0.23 | 0.22 | -0.39 | |||||||||||||
| MAX | 0.63 | 1.35 | 0.72 | 0.43 | 1.96 | 5.25 | 3.75 | 2.96 | 4.52 | 1.70 | 1.60 | 0.81 | 14.74 | |||||||||||||
| MIN | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.80 | 0.46 | 0.90 | 1.12 | 0.12 | 0.00 | 0.10 | 9.93 | |||||||||||||
| YRS | 9 | 11 | 9 | 11 | 9 | 9 | 8 | 10 | 9 | 7 | 7 | 7 | 3 | |||||||||||||