| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1985 | ----- | z | 13.30 | 26.84 | b | 37.95 | a | 47.80 | h | 54.58 | d | 60.32 | 58.82 | 47.62 | a | 41.04 | q | 24.88 | i | 16.78 | m | 42.78 | ||||
| 1986 | 20.19 | 26.41 | 33.50 | 39.08 | 46.10 | k | 56.00 | a | 57.82 | 59.53 | 48.88 | 39.35 | h | 29.08 | l | 16.47 | m | 42.68 | ||||||||
| 1987 | 17.17 | k | 23.81 | l | 26.45 | j | 36.53 | n | ----- | z | 55.60 | 59.13 | 57.21 | 49.58 | 44.12 | j | 23.58 | r | 18.45 | k | 55.38 | |||||
| 1988 | 14.92 | l | 19.84 | m | 26.43 | j | 40.58 | q | 46.50 | o | 57.76 | a | ----- | z | 59.90 | 49.78 | 46.00 | q | 30.00 | o | 14.73 | 45.54 | ||||
| 1989 | 12.94 | 19.59 | 33.05 | 39.92 | 45.47 | l | 52.07 | 61.29 | 57.27 | 52.23 | 40.87 | 29.83 | 17.02 | 37.82 | ||||||||||||
| 1990 | 17.08 | 23.13 | a | 32.86 | b | 41.35 | 44.90 | 56.60 | 59.48 | 58.15 | 54.87 | 40.60 | ----- | z | ----- | z | 42.90 | |||||||||
| 1991 | ----- | z | ----- | z | ----- | z | 33.45 | 46.60 | 54.85 | 59.42 | 58.65 | 51.23 | 42.63 | 25.62 | a | 14.98 | 43.05 | |||||||||
| 1992 | 15.56 | 22.40 | 31.34 | 41.72 | 49.81 | 53.10 | 56.53 | 56.69 | 50.93 | 43.42 | r | 18.31 | l | 16.26 | 39.43 | |||||||||||
| 1993 | 18.55 | 20.82 | 27.87 | 33.45 | 46.32 | 52.77 | 56.47 | 57.23 | 47.80 | 39.05 | 20.85 | 16.56 | 36.48 | |||||||||||||
| 1994 | 17.74 | 19.48 | 30.48 | 37.27 | 47.47 | 55.07 | 59.23 | 58.55 | 49.95 | 39.19 | 23.82 | 17.97 | 38.02 | |||||||||||||
| 1995 | 17.03 | 25.50 | 28.16 | 32.87 | 41.37 | 50.78 | 55.35 | 58.74 | 49.93 | 35.42 | 27.97 | 17.61 | 36.73 | |||||||||||||
| 1996 | 15.29 | 20.71 | 25.76 | 34.05 | 47.79 | 53.30 | 58.66 | 57.39 | 46.83 | 36.97 | 27.42 | 17.73 | 36.82 | |||||||||||||
| 1997 | 16.11 | 17.80 | 28.27 | 31.68 | 43.69 | 52.68 | 56.76 | 55.74 | 52.05 | 37.68 | 25.30 | 15.85 | 36.14 | |||||||||||||
| 1998 | 19.29 | 21.93 | 27.47 | 35.18 | 46.98 | 50.15 | 61.39 | 57.48 | 53.68 | 39.53 | 29.38 | 18.90 | 38.45 | |||||||||||||
| 1999 | 21.47 | 22.79 | 33.18 | 34.73 | 43.84 | 52.37 | 58.71 | 56.90 | 47.72 | 39.68 | 30.53 | 18.27 | 38.35 | |||||||||||||
| 2000 | 21.60 | 25.14 | a | 30.98 | 40.33 | a | 48.66 | 53.98 | 60.33 | a | 60.48 | 50.74 | a | 41.66 | 18.18 | 17.10 | 39.10 | |||||||||
| 2001 | 15.40 | 23.54 | 30.44 | 38.73 | 47.52 | 54.10 | 61.65 | a | 57.65 | 51.52 | 40.77 | 28.98 | 15.94 | 38.85 | ||||||||||||
| 2002 | 15.87 | 15.96 | 25.02 | 41.35 | 46.40 | 56.70 | 62.32 | 57.71 | 50.12 | 37.71 | 22.15 | 18.60 | 37.49 | |||||||||||||
| 2003 | 23.87 | 21.04 | 28.44 | 37.27 | 46.15 | 52.23 | 62.11 | 59.87 | 48.35 | 43.42 | 26.40 | 20.60 | 39.14 | |||||||||||||
| 2004 | 16.81 | 19.71 | 32.60 | 39.30 | 46.34 | 52.35 | 57.03 | 54.27 | 48.53 | 39.39 | 28.23 | 16.97 | 37.63 | |||||||||||||
| 2005 | 22.18 | 21.71 | 27.11 | 36.83 | 46.02 | 51.47 | 60.21 | 56.06 | 51.13 | 41.71 | ----- | z | ----- | z | 41.44 | |||||||||||
| 2006 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 55.77 | 61.23 | 58.05 | 44.83 | 36.77 | 26.43 | 18.47 | 43.08 | ||||||||
| 2007 | 13.08 | 21.48 | 31.65 | a | 38.48 | 46.24 | 54.32 | 62.27 | 60.66 | 51.12 | 38.87 | 28.75 | 16.55 | 38.62 | ||||||||||||
| 2008 | 12.27 | a | 19.07 | 23.29 | 30.23 | 42.97 | 52.17 | 60.11 | 58.05 | 49.57 | 39.71 | 30.60 | f | 18.17 | a | 36.87 | ||||||||||
| 2009 | 17.66 | 23.25 | 28.56 | 33.12 | 47.82 | 51.62 | 57.71 | 55.08 | 50.60 | 36.13 | d | 27.73 | 12.36 | b | 36.80 | |||||||||||
| 2010 | 17.07 | a | 17.46 | 27.42 | 36.07 | 42.44 | 54.70 | 60.16 | 57.02 | 50.95 | 41.32 | 23.35 | 23.03 | 37.58 | ||||||||||||
| 2011 | 15.60 | a | 16.02 | 28.98 | b | 34.98 | a | 41.18 | 52.72 | a | 60.15 | 58.60 | 50.38 | 38.79 | 25.17 | 17.02 | 36.63 | |||||||||
| 2012 | 18.02 | 20.10 | 31.87 | a | 40.98 | 47.34 | b | ----- | z | 61.18 | 58.60 | 50.68 | 39.90 | 29.47 | 18.94 | 37.92 | ||||||||||
| 2013 | 13.74 | 17.88 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 15.81 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 17.27 | 20.65 | 29.38 | 36.82 | 45.81 | 53.70 | 59.52 | 57.87 | 50.06 | 39.47 | 26.28 | 17.37 | 37.68 | |||||||||||||
| S.D. | 3.02 | 3.15 | 2.82 | 3.32 | 2.32 | 1.93 | 1.95 | 1.52 | 2.06 | 2.05 | 3.27 | 2.10 | 1.00 | |||||||||||||
| SKEW | 0.40 | -0.28 | -0.23 | -0.19 | -0.57 | 0.24 | -0.44 | -0.23 | -0.16 | -0.12 | -0.87 | 0.30 | 0.02 | |||||||||||||
| MAX | 23.87 | 26.41 | 33.50 | 41.72 | 49.81 | 57.76 | 62.32 | 60.66 | 54.87 | 43.42 | 30.53 | 23.03 | 39.14 | |||||||||||||
| MIN | 12.27 | 13.30 | 23.29 | 30.23 | 41.18 | 50.15 | 55.35 | 54.27 | 44.83 | 35.42 | 18.18 | 12.36 | 36.14 | |||||||||||||
| NO YRS | 24 | 25 | 24 | 25 | 22 | 27 | 27 | 28 | 28 | 23 | 20 | 23 | 16 | |||||||||||||