| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1975 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 66.57 | a | 61.13 | 48.52 | 37.40 | 27.00 | 48.12 | |||||
| 1976 | 30.97 | 36.69 | 37.55 | 44.03 | 53.48 | 61.17 | 68.03 | 65.10 | a | 59.37 | 47.52 | 37.93 | 31.26 | 47.76 | ||||||||||||
| 1977 | 32.42 | 34.82 | 34.39 | 45.10 | 46.32 | 60.55 | h | 68.48 | 68.50 | a | 62.66 | a | 50.81 | 39.93 | 35.74 | 47.20 | ||||||||||
| 1978 | 33.06 | 35.11 | 41.20 | a | 42.77 | 50.97 | 61.57 | 65.21 | b | 64.97 | 59.83 | 54.10 | 41.07 | 29.87 | 48.31 | |||||||||||
| 1979 | 29.55 | 31.96 | 38.52 | 44.47 | 52.00 | 61.40 | 67.23 | 61.81 | 62.08 | d | 51.37 | a | 35.40 | 32.61 | 47.37 | |||||||||||
| 1980 | 35.69 | b | 37.52 | 37.90 | 44.23 | ----- | z | 58.87 | 65.16 | 65.45 | 59.37 | 48.19 | 37.90 | 36.58 | 47.90 | |||||||||||
| 1981 | 36.03 | 36.29 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 36.16 | |||
| 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 | 71.13 | 69.10 | 66.03 | 56.71 | 46.73 | 33.81 | 57.25 | |||||||
| 2002 | 35.81 | 38.14 | 40.42 | 52.73 | 57.29 | 69.23 | 72.52 | 70.61 | 64.93 | 52.13 | 43.80 | 35.10 | 52.73 | |||||||||||||
| 2003 | 40.71 | 39.43 | 41.87 | 46.43 | 57.87 | 67.33 | 73.39 | 71.23 | 64.60 | 57.42 | 41.77 | 36.10 | 53.18 | |||||||||||||
| 2004 | 37.23 | 34.76 | 48.26 | 48.13 | 59.52 | ----- | z | 70.19 | ----- | z | ----- | z | ----- | z | 39.47 | 31.58 | 46.14 | |||||||||
| 2005 | 36.61 | 40.00 | 39.71 | 44.33 | 52.97 | 60.87 | 67.94 | 67.06 | 61.70 | 51.55 | 39.10 | 30.77 | 49.38 | |||||||||||||
| 2006 | 31.26 | 33.82 | 38.35 | 45.70 | 54.55 | 65.47 | 70.87 | 67.97 | 58.87 | 48.90 | 39.27 | 30.84 | 48.82 | |||||||||||||
| 2007 | 30.39 | 35.50 | 41.13 | 46.70 | 55.77 | 62.37 | 71.55 | 70.39 | 64.37 | 51.39 | 42.90 | 32.03 | 50.37 | |||||||||||||
| 2008 | 33.03 | 34.69 | 38.10 | 43.20 | 50.32 | 62.20 | 69.45 | 68.26 | 61.10 | 48.52 | 41.13 | 32.94 | 48.58 | |||||||||||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 34.06 | 36.06 | 39.78 | 45.65 | 53.73 | 63.05 | 69.32 | 67.46 | 62.00 | 51.32 | 40.27 | 32.59 | 49.61 | |||||||||||||
| S.D. | 3.24 | 2.27 | 3.36 | 2.70 | 3.82 | 3.24 | 2.60 | 2.68 | 2.38 | 3.17 | 2.92 | 2.69 | 2.09 | |||||||||||||
| SKEW | 0.41 | 0.18 | 1.09 | 1.55 | -0.29 | 0.80 | -0.17 | -0.46 | 0.27 | 0.71 | 0.54 | -0.22 | 0.79 | |||||||||||||
| MAX | 40.71 | 40.00 | 48.26 | 52.73 | 59.52 | 69.23 | 73.39 | 71.23 | 66.03 | 57.42 | 46.73 | 36.58 | 53.18 | |||||||||||||
| MIN | 29.55 | 31.96 | 34.39 | 42.77 | 46.32 | 58.87 | 65.16 | 61.81 | 58.87 | 47.52 | 35.40 | 27.00 | 47.37 | |||||||||||||
| NO YRS | 13 | 13 | 12 | 12 | 11 | 10 | 13 | 13 | 13 | 13 | 14 | 14 | 9 | |||||||||||||