| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1991 | ----- | z | 39.18 | 32.52 | ----- | z | 42.23 | 57.13 | ----- | z | 64.97 | 58.77 | 46.94 | 33.50 | 30.58 | 45.09 | ||||||||||
| 1992 | 31.74 | 32.28 | 36.55 | 49.80 | 49.19 | 59.63 | 65.00 | 64.16 | 60.33 | 46.39 | 26.70 | 24.58 | 45.53 | |||||||||||||
| 1993 | 27.65 | 28.71 | 42.61 | 43.87 | 53.58 | 59.73 | 66.55 | 66.52 | 59.80 | 43.07 | a | 32.13 | 28.57 | a | 46.07 | |||||||||||
| 1994 | 30.00 | a | 30.71 | 40.40 | a | 42.60 | 50.90 | 67.60 | 72.16 | 69.23 | 59.10 | 43.19 | 27.34 | a | 27.61 | 46.74 | ||||||||||
| 1995 | 27.42 | 37.93 | 35.23 | a | 41.90 | 44.94 | 53.97 | 67.19 | 69.58 | 60.87 | 50.27 | a | 42.00 | a | 27.77 | 46.59 | ||||||||||
| 1996 | 30.19 | d | 34.72 | 37.53 | a | 43.10 | 55.45 | 69.30 | 71.29 | 69.48 | 56.60 | 44.10 | 34.73 | 26.17 | a | 47.72 | ||||||||||
| 1997 | 24.94 | 26.89 | a | 42.00 | a | 40.80 | 54.00 | 63.57 | 69.19 | 67.84 | 56.57 | 46.40 | a | 35.07 | 25.39 | 46.05 | ||||||||||
| 1998 | 28.97 | a | 26.36 | 34.20 | a | 38.53 | 50.52 | 59.30 | 69.32 | 68.65 | 58.30 | 45.77 | 35.70 | 28.60 | a | 45.35 | ||||||||||
| 1999 | 30.16 | 35.00 | 41.26 | 37.59 | a | 51.74 | 62.03 | 66.84 | 65.97 | 59.83 | 56.32 | 44.83 | 29.90 | a | 48.46 | |||||||||||
| 2000 | 30.00 | 33.41 | 36.90 | 50.53 | 57.39 | 70.10 | 73.74 | 68.71 | 63.60 | 47.48 | 29.93 | 32.87 | 49.56 | |||||||||||||
| 2001 | 26.94 | 29.93 | 39.65 | 44.07 | 58.00 | 68.67 | 70.03 | 70.68 | 65.87 | 52.68 | 37.69 | a | 25.42 | 49.13 | ||||||||||||
| 2002 | 28.32 | 34.54 | 34.50 | a | 48.73 | 58.73 | a | 73.47 | 72.97 | 71.94 | 57.57 | 44.32 | 37.60 | 26.53 | a | 49.10 | ||||||||||
| 2003 | 37.06 | 29.56 | a | ----- | z | 40.17 | a | 56.45 | 68.70 | 74.00 | 70.32 | 62.73 | 54.68 | 32.89 | c | 29.14 | b | 50.52 | ||||||||
| 2004 | 26.74 | 24.45 | 41.37 | a | 41.73 | 56.68 | 64.63 | 70.71 | 67.94 | 59.50 | 43.45 | 32.03 | a | 29.10 | b | 46.53 | ||||||||||
| 2005 | 29.71 | 30.46 | 34.90 | 41.47 | 54.03 | 63.53 | 73.81 | 64.48 | 59.27 | 46.03 | 38.62 | a | 31.38 | b | 47.31 | |||||||||||
| 2006 | 28.83 | a | 32.50 | 31.38 | b | 46.17 | a | 57.19 | 72.23 | 73.90 | 72.35 | 62.07 | a | 52.84 | l | 40.97 | a | 33.26 | 50.08 | |||||||
| 2007 | 30.66 | b | 35.33 | a | 44.23 | 49.00 | n | ----- | z | ----- | z | 79.13 | h | 74.45 | i | 66.59 | m | 60.44 | v | 50.29 | p | 27.25 | o | 36.74 | ||
| 2008 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 76.42 | g | 76.16 | 65.27 | d | ----- | z | 42.53 | k | 29.84 | 57.09 | |||
| 2009 | 34.85 | e | 33.52 | g | 38.77 | i | 41.25 | r | 65.38 | r | 65.15 | j | 76.67 | m | 75.20 | k | 62.25 | v | 44.11 | m | 43.46 | f | ----- | z | 34.85 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 29.66 | 31.88 | 37.83 | 43.40 | 53.19 | 64.60 | 70.45 | 68.76 | 60.36 | 47.41 | 35.11 | 28.63 | 47.24 | |||||||||||||
| S.D. | 2.94 | 4.05 | 3.89 | 3.90 | 4.73 | 5.69 | 3.03 | 3.10 | 2.75 | 4.21 | 5.07 | 2.55 | 1.43 | |||||||||||||
| SKEW | 0.98 | -0.03 | 0.01 | 0.52 | -0.95 | -0.17 | -0.34 | 0.50 | 0.60 | 0.96 | 0.13 | 0.19 | 0.34 | |||||||||||||
| MAX | 37.06 | 39.18 | 44.23 | 50.53 | 58.73 | 73.47 | 74.00 | 76.16 | 65.87 | 56.32 | 44.83 | 33.26 | 49.56 | |||||||||||||
| MIN | 24.94 | 24.45 | 31.38 | 37.59 | 42.23 | 53.97 | 65.00 | 64.16 | 56.57 | 43.07 | 26.70 | 24.58 | 45.35 | |||||||||||||
| NO YRS | 17 | 17 | 16 | 15 | 16 | 16 | 15 | 17 | 17 | 15 | 16 | 17 | 13 | |||||||||||||