| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1975 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1976 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1977 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1978 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1979 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1980 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1981 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1982 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1983 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1984 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1985 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1986 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1987 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1988 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1989 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1990 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1991 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1992 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1993 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1994 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1995 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1996 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1997 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1998 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1999 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 2000 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 2001 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 2002 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 2003 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 50.00 | a | ----- | z |
| 2004 | 47.00 | 49.00 | 72.00 | 67.00 | 76.00 | 83.00 | 87.00 | 86.00 | a | 84.00 | 72.00 | 63.00 | 53.00 | b | 87.00 | c | ||||||||||
| 2005 | 53.00 | a | ----- | z | 57.00 | a | 68.00 | 79.00 | 85.00 | 92.00 | 85.00 | 80.00 | 71.00 | 63.00 | 50.00 | ----- | z | |||||||||
| 2006 | 49.00 | 52.00 | 55.00 | 70.00 | 78.00 | h | 89.00 | c | 92.00 | a | 84.00 | 81.00 | 70.00 | 66.00 | 47.00 | 92.00 | l | |||||||||
| 2007 | 46.00 | 52.00 | 68.00 | 76.00 | a | 78.00 | 87.00 | a | 91.00 | 87.00 | 84.00 | 71.00 | 63.00 | 50.00 | 91.00 | b | ||||||||||
| 2008 | 41.00 | 52.00 | 54.00 | ----- | z | ----- | z | 84.00 | 89.00 | 88.00 | 78.00 | 76.00 | 63.00 | 52.00 | ----- | z | ||||||||||
| 2009 | 50.00 | 55.00 | 66.00 | 70.00 | 81.00 | 82.00 | 91.00 | 90.00 | 82.00 | 71.00 | a | 67.00 | 43.00 | 91.00 | a | |||||||||||
| 2010 | 42.00 | 42.00 | 58.00 | 68.00 | 70.00 | a | 84.00 | 87.00 | 87.00 | 82.00 | 81.00 | a | 64.00 | 50.00 | 87.00 | b | ||||||||||
| 2011 | 44.00 | 47.00 | ----- | z | 65.00 | 72.00 | 83.00 | a | 87.00 | 86.00 | 80.00 | 71.00 | 52.00 | 49.00 | ----- | z | ||||||||||
| 2012 | 52.00 | 44.00 | 68.00 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 47.11 | 49.13 | 62.25 | 69.14 | 76.00 | 84.63 | 89.50 | 86.63 | 81.38 | 72.88 | 62.63 | 49.33 | 89.00 | |||||||||||||
| S.D. | 4.26 | 4.49 | 6.98 | 3.48 | 4.24 | 2.33 | 2.27 | 1.85 | 2.07 | 3.76 | 4.57 | 2.92 | 2.31 | |||||||||||||
| SKEW | -0.07 | -0.39 | 0.09 | 1.02 | -0.34 | 0.85 | -0.12 | 0.44 | -0.12 | 1.48 | -1.72 | -1.06 | 0.00 | |||||||||||||
| MAX | 53.00 | 55.00 | 72.00 | 76.00 | 81.00 | 89.00 | 92.00 | 90.00 | 84.00 | 81.00 | 67.00 | 53.00 | 91.00 | |||||||||||||
| MIN | 41.00 | 42.00 | 54.00 | 65.00 | 70.00 | 82.00 | 87.00 | 84.00 | 78.00 | 70.00 | 52.00 | 43.00 | 87.00 | |||||||||||||
| YRS | 9 | 8 | 8 | 7 | 6 | 8 | 8 | 8 | 8 | 8 | 8 | 9 | 4 | |||||||||||||