| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1975 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 95.10 | a | 87.00 | 80.58 | 68.07 | 57.74 | 77.70 | |||||
| 1976 | 57.16 | 62.62 | 64.77 | 72.93 | 83.16 | 93.40 | 93.03 | 92.37 | a | 84.23 | 74.03 | 65.63 | 57.26 | 75.05 | ||||||||||||
| 1977 | 54.94 | 64.79 | 62.00 | 76.23 | 79.74 | 93.70 | 94.29 | 94.77 | a | 88.41 | a | 79.81 | 68.07 | 61.45 | 76.52 | |||||||||||
| 1978 | 54.19 | 58.36 | 67.13 | a | 74.27 | 80.97 | 94.10 | 96.21 | b | 91.87 | 86.90 | 80.32 | 62.53 | 50.61 | 74.79 | |||||||||||
| 1979 | 48.74 | 59.25 | 62.81 | 74.23 | 78.97 | 90.30 | 94.94 | 90.74 | 90.17 | 82.87 | a | 61.73 | 57.87 | 74.38 | ||||||||||||
| 1980 | 54.83 | b | 60.24 | 61.97 | 73.80 | ----- | z | 94.27 | 98.29 | 92.10 | 88.57 | 77.35 | 66.50 | 62.03 | 75.45 | |||||||||||
| 1981 | 58.81 | 63.82 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 61.31 | |||
| 1982 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1983 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1984 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1985 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1986 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1987 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1988 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1989 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1990 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1991 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1992 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1993 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1994 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1995 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1996 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1997 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1998 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1999 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2000 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2001 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 95.16 | 94.39 | 93.00 | 82.19 | 69.23 | 55.32 | 81.55 | |||||||
| 2002 | 58.03 | 65.07 | 69.26 | 80.77 | 87.10 | 98.47 | 98.00 | 95.90 | 90.23 | 77.10 | 66.83 | 55.32 | 78.51 | |||||||||||||
| 2003 | 64.87 | 58.93 | 66.00 | 73.50 | 87.03 | 95.47 | 100.52 | 96.35 | 91.07 | 85.29 | 64.80 | 56.81 | 78.39 | |||||||||||||
| 2004 | 56.84 | 57.69 | 73.42 | 73.33 | 86.94 | ----- | z | 96.74 | ----- | z | ----- | z | ----- | z | 62.27 | 59.65 | 70.86 | |||||||||
| 2005 | 60.13 | 60.68 | 68.13 | 79.17 | 89.19 | 95.97 | 100.81 | 94.03 | 92.10 | 81.58 | 72.00 | 63.13 | 79.74 | |||||||||||||
| 2006 | 64.23 | 69.25 | 67.19 | 79.20 | 90.00 | 98.77 | 97.10 | 91.61 | 86.47 | 77.58 | 71.97 | 59.23 | 79.38 | |||||||||||||
| 2007 | 55.29 | 64.50 | 74.74 | 78.43 | 88.19 | 97.07 | 97.39 | 95.48 | 92.03 | 82.58 | 74.70 | 56.19 | 79.72 | |||||||||||||
| 2008 | 57.16 | 63.28 | 71.77 | 78.57 | 82.65 | 97.00 | 94.61 | 93.26 | 89.23 | 81.32 | 69.93 | 56.19 | 77.91 | |||||||||||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 57.32 | 62.19 | 67.43 | 76.20 | 84.90 | 95.32 | 96.70 | 93.69 | 89.19 | 80.20 | 67.45 | 57.77 | 77.44 | |||||||||||||
| S.D. | 4.23 | 3.35 | 4.29 | 2.84 | 3.93 | 2.49 | 2.34 | 1.82 | 2.58 | 3.01 | 3.91 | 3.23 | 2.09 | |||||||||||||
| SKEW | 0.10 | 0.45 | 0.30 | 0.28 | -0.26 | -0.37 | 0.35 | -0.09 | -0.26 | -0.40 | 0.16 | -0.27 | -0.34 | |||||||||||||
| MAX | 64.87 | 69.25 | 74.74 | 80.77 | 90.00 | 98.77 | 100.81 | 96.35 | 93.00 | 85.29 | 74.70 | 63.13 | 79.74 | |||||||||||||
| MIN | 48.74 | 57.69 | 61.97 | 72.93 | 78.97 | 90.30 | 93.03 | 90.74 | 84.23 | 74.03 | 61.73 | 50.61 | 74.38 | |||||||||||||
| NO YRS | 13 | 13 | 12 | 12 | 11 | 11 | 13 | 13 | 13 | 13 | 14 | 14 | 10 | |||||||||||||