| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1974 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 37.73 | s | 39.58 | 42.58 | 35.70 | 31.94 | 29.47 | 22.58 | 33.64 | |||||||
| 1975 | 22.74 | 20.18 | 23.32 | 24.17 | 30.65 | 37.93 | 44.35 | 39.16 | 35.97 | 33.10 | 22.23 | 21.26 | 29.59 | |||||||||||||
| 1976 | 18.29 | 19.28 | 20.58 | 25.93 | 31.48 | 35.20 | 43.48 | 43.68 | 39.17 | 28.61 | 27.60 | 19.39 | 29.39 | |||||||||||||
| 1977 | 13.61 | 22.79 | 21.23 | 26.40 | 31.71 | 38.57 | 39.87 | 48.39 | 36.63 | ----- | z | ----- | z | ----- | z | 31.02 | ||||||||||
| 1978 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 28.42 | ----- | z | ----- | z | 28.42 | ||
| 1979 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 17.89 | l | ----- | z | 9999.00 | |
| 1980 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 40.71 | 33.48 | 33.43 | 29.65 | 26.87 | 23.03 | a | 31.20 | ||||||
| 1981 | 24.52 | 21.48 | a | 25.97 | 27.70 | 29.10 | 36.69 | d | 36.93 | d | 40.77 | e | 36.22 | c | 28.10 | k | 29.15 | d | 24.42 | 30.27 | ||||||
| 1982 | 14.90 | a | 13.71 | 21.23 | 22.77 | 29.16 | 39.87 | 41.71 | 43.35 | 36.03 | ----- | z | 21.50 | b | 17.57 | a | 27.44 | |||||||||
| 1983 | 22.68 | ----- | z | 22.22 | v | 26.20 | 33.29 | 36.89 | k | ----- | z | ----- | z | 30.56 | u | 32.81 | ----- | z | ----- | z | 28.74 | |||||
| 1984 | ----- | z | ----- | z | ----- | z | ----- | z | 31.11 | m | 36.80 | 42.29 | n | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 36.80 | ||
| 1985 | 16.63 | l | 16.62 | g | 21.22 | h | 27.54 | q | ----- | 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 | 35.20 | z | 26.00 | a | 20.71 | g | 26.00 | |
| 1988 | 17.90 | 20.90 | 23.52 | 31.62 | n | 31.17 | h | 35.71 | m | 42.52 | 38.96 | d | 35.17 | 35.43 | j | 26.37 | 20.81 | 28.27 | ||||||||
| 1989 | 18.00 | j | 11.19 | a | 25.24 | j | 29.25 | r | 30.35 | 36.17 | l | 39.73 | i | 35.10 | 30.80 | o | 27.91 | t | 23.75 | j | 20.68 | 24.33 | ||||
| 1990 | 24.26 | 17.89 | ----- | z | 32.33 | r | 36.14 | x | ----- | z | 47.20 | k | ----- | z | 37.60 | t | ----- | z | 28.77 | 13.61 | 21.13 | |||||
| 1991 | 20.39 | 27.93 | 24.87 | 29.67 | r | 31.12 | n | ----- | z | 42.33 | s | 43.55 | i | 34.84 | k | 31.90 | 30.13 | ----- | z | 27.04 | ||||||
| 1992 | 23.45 | 27.31 | ----- | z | 32.63 | 39.82 | n | 41.00 | o | 42.71 | 41.42 | 37.03 | 29.71 | j | 24.90 | i | 18.65 | 31.89 | ||||||||
| 1993 | 15.84 | 16.96 | 28.52 | 27.92 | r | 33.00 | 37.07 | 39.00 | 41.32 | 34.33 | 33.52 | 18.03 | 20.58 | 28.92 | ||||||||||||
| 1994 | 23.42 | 21.00 | a | 25.61 | 31.83 | 38.68 | 40.40 | 47.23 | 39.71 | 43.40 | j | 33.39 | 18.75 | j | 19.71 | 32.10 | ||||||||||
| 1995 | 25.90 | 26.89 | 24.32 | 26.72 | l | 33.23 | r | 38.23 | 44.44 | o | ----- | z | 40.06 | n | 32.16 | 30.45 | a | 25.06 | 29.00 | |||||||
| 1996 | 23.90 | 23.07 | 25.87 | 28.00 | r | 33.07 | p | 37.67 | x | 45.03 | 45.48 | ----- | z | ----- | z | 30.27 | o | 23.68 | 31.17 | |||||||
| 1997 | 19.68 | 23.11 | 25.29 | n | ----- | z | 41.75 | o | 38.80 | 43.45 | k | 44.00 | 38.07 | 32.13 | 29.73 | 17.97 | 30.44 | |||||||||
| 1998 | 26.48 | 25.86 | 24.19 | 28.83 | 34.39 | 39.83 | 50.00 | 46.03 | 40.27 | 29.90 | 29.30 | 17.94 | 32.75 | |||||||||||||
| 1999 | 22.00 | 21.54 | 23.87 | 27.00 | 32.19 | 39.73 | 41.35 | 45.72 | b | 34.23 | 29.94 | 30.40 | 19.39 | 30.61 | ||||||||||||
| 2000 | 18.35 | 22.48 | 22.19 | 29.13 | 34.39 | 40.00 | 42.06 | 42.03 | a | 33.82 | b | 29.68 | 21.73 | 21.33 | a | 29.77 | ||||||||||
| 2001 | 16.77 | 18.54 | 25.94 | 25.15 | c | 34.35 | 35.61 | b | 43.32 | 43.74 | 37.10 | 30.97 | a | 28.00 | 21.50 | a | 30.08 | |||||||||
| 2002 | 18.35 | 15.89 | 20.32 | 29.00 | 32.19 | 40.03 | 45.55 | 40.26 | 35.97 | 25.74 | 24.37 | 24.87 | 29.38 | |||||||||||||
| 2003 | 26.03 | 20.07 | 27.45 | 27.93 | 33.87 | 40.17 | 46.58 | 43.06 | 38.17 | 31.87 | 22.60 | 24.71 | 31.88 | |||||||||||||
| 2004 | 22.58 | 21.55 | 26.52 | 28.40 | 34.90 | 40.20 | 45.13 | 46.39 | 37.03 | 30.52 | 25.23 | 23.68 | 31.84 | |||||||||||||
| 2005 | 22.35 | 19.25 | 26.74 | 29.37 | 36.55 | 37.57 | 44.81 | 41.78 | d | 34.77 | 31.55 | 24.90 | 17.84 | 30.62 | ||||||||||||
| 2006 | 24.29 | c | 16.50 | 21.65 | 28.35 | j | ----- | z | 40.08 | f | ----- | z | 37.87 | 36.40 | ----- | z | 26.67 | ----- | z | 27.23 | ||||||
| 2007 | ----- | z | 23.86 | 27.83 | a | 28.17 | 34.13 | 37.73 | 49.10 | 44.19 | 36.33 | 29.81 | 25.23 | 15.56 | d | 31.99 | ||||||||||
| 2008 | ----- | z | ----- | z | 18.87 | 19.23 | ----- | z | ----- | z | ----- | z | 43.13 | 33.30 | 32.10 | a | 29.20 | 19.32 | 27.88 | |||||||
| 2009 | 18.03 | 17.86 | 21.91 | i | 25.07 | 34.32 | f | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 20.32 | ||||
| 2010 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2011 | 19.74 | 19.07 | 25.06 | 25.10 | 29.87 | 38.66 | a | 42.00 | 44.03 | 37.20 | 31.26 | 25.40 | 17.58 | 29.58 | ||||||||||||
| 2012 | 21.00 | 19.72 | 22.13 | 28.77 | 33.55 | 38.03 | 44.87 | 42.97 | 36.80 | 30.90 | 28.37 | 22.52 | 30.80 | |||||||||||||
| 2013 | 16.35 | 20.68 | 23.37 | d | 32.50 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 4.00 | z | 20.13 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 20.85 | 20.57 | 24.05 | 27.08 | 32.89 | 38.43 | 43.39 | 42.17 | 36.21 | 30.95 | 26.45 | 20.56 | 30.53 | |||||||||||||
| S.D. | 3.58 | 3.85 | 2.56 | 3.00 | 2.45 | 1.56 | 3.19 | 3.35 | 1.73 | 1.83 | 3.24 | 2.96 | 1.12 | |||||||||||||
| SKEW | -0.26 | -0.15 | -0.16 | -0.56 | 0.36 | -0.49 | 0.15 | -0.72 | 0.26 | -0.93 | -0.77 | -0.29 | 0.71 | |||||||||||||
| MAX | 26.48 | 27.93 | 28.52 | 32.63 | 38.68 | 40.40 | 50.00 | 48.39 | 40.27 | 33.52 | 30.45 | 25.06 | 32.75 | |||||||||||||
| MIN | 13.61 | 11.19 | 18.87 | 19.23 | 29.10 | 35.20 | 36.93 | 33.48 | 33.30 | 25.74 | 18.03 | 13.61 | 29.38 | |||||||||||||
| NO YRS | 28 | 29 | 25 | 21 | 20 | 21 | 23 | 27 | 24 | 23 | 26 | 27 | 12 | |||||||||||||