| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1978 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 25.27 | d | 12.96 | e | 19.12 | |
| 1979 | 8.38 | e | 20.00 | e | 26.30 | k | 27.96 | c | 39.17 | a | 47.63 | 53.28 | b | 51.81 | d | 50.05 | j | 36.10 | j | 23.75 | j | 22.56 | o | 35.46 | ||
| 1980 | 14.72 | m | 26.96 | f | 19.61 | h | 31.27 | h | ----- | z | 41.40 | j | 55.19 | j | 48.29 | g | ----- | z | ----- | z | ----- | z | 24.10 | u | 9999.00 | |
| 1981 | 24.54 | r | 17.72 | j | 20.71 | j | 33.24 | i | 34.31 | o | ----- | z | 50.00 | j | 57.90 | j | 49.11 | l | 32.09 | i | 30.95 | k | 19.33 | m | 9999.00 | |
| 1982 | 12.45 | k | 13.40 | c | 16.67 | m | 22.90 | j | 33.05 | k | 44.24 | i | 49.81 | j | 52.00 | i | 41.05 | i | 31.19 | j | 20.20 | j | 16.05 | k | 13.40 | |
| 1983 | 24.24 | j | 18.56 | a | 24.90 | 23.50 | j | 34.14 | j | 41.57 | 47.50 | k | 53.03 | 41.73 | 37.14 | j | 24.55 | j | 10.94 | o | 35.96 | |||||
| 1984 | 17.52 | j | 18.24 | 23.45 | 25.73 | 34.61 | 41.13 | 55.45 | 54.84 | 43.30 | 28.65 | 19.43 | 14.71 | 32.69 | ||||||||||||
| 1985 | 15.52 | 13.68 | 20.29 | 32.70 | 43.42 | 50.53 | 59.90 | 49.68 | 36.76 | a | 32.35 | 16.03 | 19.59 | b | 32.54 | |||||||||||
| 1986 | 27.42 | 26.79 | 33.68 | 29.70 | 39.16 | 52.13 | 52.42 | 61.55 | 37.87 | 38.39 | 25.14 | a | 24.19 | 37.37 | ||||||||||||
| 1987 | 15.87 | 22.64 | 24.19 | 34.90 | 40.77 | 47.43 | 47.97 | 53.16 | 49.57 | 42.94 | 28.37 | 19.80 | k | 37.07 | ||||||||||||
| 1988 | 18.29 | 24.69 | 23.26 | 34.05 | j | 38.48 | 48.57 | 52.68 | 52.74 | 44.10 | 43.97 | 22.47 | 18.61 | 35.26 | ||||||||||||
| 1989 | 16.26 | 13.32 | 26.10 | 35.07 | 36.74 | 49.33 | 57.87 | 51.06 | 48.87 | 36.19 | 25.59 | a | 22.74 | 34.93 | ||||||||||||
| 1990 | 23.45 | 17.61 | 27.81 | 36.53 | 36.13 | 46.70 | 57.03 | 54.74 | 52.83 | 35.94 | 27.47 | 10.78 | m | 37.84 | ||||||||||||
| 1991 | 17.73 | i | 30.37 | i | 22.05 | j | 28.70 | 32.47 | l | 41.00 | j | 54.73 | i | 57.00 | i | 47.34 | a | ----- | z | 26.80 | 21.45 | 31.07 | ||||
| 1992 | 25.52 | 27.79 | 32.00 | 36.60 | 47.87 | 49.43 | 52.68 | 57.29 | 48.27 | 41.35 | 23.47 | 18.10 | 38.36 | |||||||||||||
| 1993 | 16.58 | 18.89 | 29.65 | 29.10 | 43.45 | 40.70 | 44.87 | 49.35 | 48.13 | 38.32 | 22.60 | 22.74 | 33.70 | |||||||||||||
| 1994 | 24.94 | 18.79 | 30.29 | 34.23 | 44.19 | 48.03 | 60.45 | 58.23 | 51.10 | 34.29 | 18.57 | 19.03 | 36.84 | |||||||||||||
| 1995 | 23.81 | 29.75 | 26.23 | 29.87 | 39.81 | 43.80 | 54.16 | 54.61 | 48.97 | 36.19 | 32.03 | a | 23.47 | a | 36.89 | |||||||||||
| 1996 | 21.65 | 23.76 | 27.13 | 31.57 | 37.55 | 48.87 | 59.84 | 57.65 | 44.27 | 40.26 | 29.37 | 23.45 | 37.11 | |||||||||||||
| 1997 | 20.06 | 20.79 | 26.87 | 28.77 | 44.81 | 47.70 | 55.52 | 57.00 | 50.57 | 36.81 | 31.93 | 25.48 | 37.19 | |||||||||||||
| 1998 | 27.32 | 24.14 | 27.90 | 30.13 | 38.10 | 41.97 | 62.84 | 59.90 | ----- | z | 32.23 | 30.52 | a | 16.16 | 35.56 | |||||||||||
| 1999 | 18.74 | 15.40 | m | 23.04 | f | 25.39 | l | 34.35 | n | 40.06 | n | 52.78 | v | 50.31 | r | 41.38 | q | 36.00 | t | 34.50 | t | ----- | z | 18.74 | ||
| 2000 | 14.75 | s | 13.50 | w | 17.77 | r | 29.00 | o | 31.74 | l | 46.39 | l | 57.47 | p | 56.63 | l | 44.80 | o | 33.55 | t | 20.46 | q | 22.88 | w | 9999.00 | |
| 2001 | 20.69 | r | 17.56 | l | 28.09 | t | 30.19 | n | 42.75 | o | 43.33 | o | 51.87 | p | 62.32 | l | 51.25 | n | 36.29 | j | 24.45 | s | 19.00 | o | 9999.00 | |
| 2002 | 17.00 | l | 19.44 | j | ----- | z | 31.10 | j | 34.71 | j | 48.76 | m | ----- | z | 48.71 | j | 43.11 | l | 31.95 | j | 29.27 | o | 22.90 | k | 9999.00 | |
| 2003 | 25.95 | k | 18.43 | n | 25.22 | m | 25.90 | j | 40.12 | o | 46.47 | k | 57.64 | q | 56.71 | q | 42.72 | l | 32.06 | o | 15.24 | m | 17.61 | m | 9999.00 | |
| 2004 | 15.71 | q | 14.69 | p | ----- | z | ----- | z | 34.20 | k | 41.81 | n | 50.78 | m | 47.22 | m | 43.50 | 34.83 | a | 22.37 | 24.68 | 31.34 | ||||
| 2005 | 23.13 | 23.75 | 27.90 | 33.57 | 40.29 | 46.27 | 60.29 | 59.06 | 47.55 | a | 39.74 | 28.23 | 22.33 | a | 37.68 | |||||||||||
| 2006 | 22.55 | b | 18.07 | 22.42 | 31.90 | a | 40.43 | a | 51.28 | e | 63.03 | a | 55.47 | a | 47.97 | 37.29 | 27.17 | 16.84 | 36.20 | |||||||
| 2007 | 14.55 | 23.61 | 30.55 | ----- | z | 42.71 | 48.77 | ----- | z | 57.32 | 46.50 | ----- | z | 29.47 | 15.77 | a | 34.36 | |||||||||
| 2008 | 16.65 | 21.39 | a | 21.39 | 24.23 | 38.19 | 46.73 | 58.67 | a | 56.48 | ----- | z | ----- | z | 32.37 | 19.03 | 33.51 | |||||||||
| 2009 | 22.16 | 19.57 | ----- | z | 27.80 | 41.94 | 45.18 | b | 57.29 | ----- | z | 52.00 | 31.65 | ----- | z | 15.42 | 34.78 | |||||||||
| 2010 | 23.16 | 21.93 | 23.87 | ----- | z | 30.87 | h | 44.67 | 54.19 | 52.94 | ----- | z | 38.19 | ----- | z | ----- | z | 36.99 | ||||||||
| 2011 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2012 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 59.26 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 59.26 | ||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 20.29 | 20.92 | 26.49 | 31.00 | 40.39 | 46.75 | 56.18 | 55.14 | 46.56 | 36.82 | 25.94 | 19.84 | 36.26 | |||||||||||||
| S.D. | 4.82 | 4.38 | 3.59 | 3.54 | 3.30 | 3.29 | 4.61 | 3.32 | 4.36 | 3.96 | 4.55 | 3.73 | 1.79 | |||||||||||||
| SKEW | -0.52 | 0.01 | 0.19 | -0.03 | 0.39 | -0.43 | -0.66 | 0.00 | -0.76 | -0.12 | -0.47 | -0.17 | -1.00 | |||||||||||||
| MAX | 27.42 | 29.75 | 33.68 | 36.60 | 47.87 | 52.13 | 63.03 | 61.55 | 52.83 | 43.97 | 32.37 | 25.48 | 38.36 | |||||||||||||
| MIN | 8.38 | 13.32 | 20.29 | 24.23 | 34.61 | 40.70 | 44.87 | 49.35 | 36.76 | 28.65 | 16.03 | 12.96 | 32.54 | |||||||||||||
| NO YRS | 21 | 23 | 20 | 19 | 20 | 22 | 21 | 21 | 20 | 19 | 21 | 20 | 11 | |||||||||||||