| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1973 | ----- | z | ----- | z | ----- | z | ----- | z | 44.77 | 49.63 | 58.94 | 54.23 | 43.77 | 35.03 | 29.63 | 24.81 | 42.60 | |||||||||
| 1974 | 16.35 | 24.29 | 29.06 | 34.25 | b | ----- | z | 52.53 | 55.17 | g | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 31.30 | |||||
| 1975 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1976 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1977 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1978 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1979 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1980 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1981 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 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 | 51.29 | 47.67 | 39.45 | 21.07 | 22.42 | 36.38 | ||||||
| 1994 | 25.45 | 21.57 | 31.94 | 37.43 | 45.03 | 50.50 | 60.48 | 58.84 | 49.97 | 35.32 | 23.40 | 18.84 | 38.23 | |||||||||||||
| 1995 | 26.97 | 31.11 | 30.35 | 33.07 | 42.19 | 46.93 | 55.84 | 53.13 | 48.30 | 35.52 | 31.70 | 23.35 | 38.21 | |||||||||||||
| 1996 | 25.71 | 25.14 | 30.81 | 34.67 | 40.45 | 49.13 | 58.29 | 55.26 | 44.43 | 36.84 | 30.37 | 27.77 | 38.24 | |||||||||||||
| 1997 | 22.42 | 24.29 | 31.39 | 32.80 | 46.94 | 49.70 | 54.26 | 56.61 | 48.00 | 34.97 | 29.70 | 19.55 | 37.55 | |||||||||||||
| 1998 | 27.84 | 26.64 | 30.10 | 34.23 | 39.97 | 46.60 | 60.74 | 58.58 | 50.87 | 35.10 | 29.57 | 18.29 | 38.21 | |||||||||||||
| 1999 | 25.03 | 25.14 | 27.90 | 31.93 | a | 40.07 | b | 47.63 | c | 55.31 | b | 55.63 | a | 45.59 | a | 36.68 | c | 32.67 | c | 21.03 | 37.05 | |||||
| 2000 | 24.90 | 30.14 | a | 28.97 | a | 37.96 | b | 43.00 | b | 50.35 | d | 58.74 | d | 58.79 | c | 45.46 | d | 36.70 | d | 24.29 | b | 21.96 | f | 39.94 | ||
| 2001 | 18.39 | 22.94 | l | 31.81 | 31.64 | b | 44.00 | d | 48.77 | d | 55.55 | b | 57.96 | d | 49.78 | c | 37.86 | b | 28.41 | a | 22.62 | b | 38.80 | |||
| 2002 | 23.45 | 22.39 | 27.32 | 36.27 | 39.89 | c | 51.56 | c | 62.26 | 52.70 | h | 47.93 | 34.10 | b | 26.73 | 26.16 | 36.19 | |||||||||
| 2003 | 28.97 | 23.46 | 33.06 | 32.69 | d | 42.65 | 51.18 | h | 64.27 | e | 58.90 | k | 48.57 | 42.08 | f | 24.17 | 27.45 | 36.14 | ||||||||
| 2004 | 22.25 | g | 25.59 | 34.94 | 35.67 | 42.90 | 50.56 | e | 60.83 | g | 55.00 | m | 47.97 | 39.43 | h | 27.30 | g | 21.16 | l | 39.60 | ||||||
| 2005 | 20.55 | i | 24.94 | j | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 35.87 | 26.67 | 22.35 | 28.30 | ||||
| 2006 | 26.39 | 20.86 | 26.94 | 35.27 | 42.19 | 52.07 | 62.97 | 54.00 | 44.37 | 34.13 | 29.17 | 19.03 | 37.28 | |||||||||||||
| 2007 | 14.23 | 25.96 | 32.66 | b | 33.63 | 44.00 | 52.10 | 62.39 | 55.97 | 43.73 | 35.58 | 27.47 | 20.45 | 37.35 | ||||||||||||
| 2008 | 17.58 | 25.48 | 26.03 | 28.90 | 41.13 | 48.90 | 58.48 | 56.52 | ----- | z | 35.75 | c | 31.43 | 21.77 | 35.63 | |||||||||||
| 2009 | 21.35 | 23.71 | 26.37 | l | 32.17 | 45.16 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 30.60 | |||||
| 2010 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 39.80 | z | 44.90 | 39.55 | 26.33 | 24.68 | 33.86 | |||||
| 2011 | 20.10 | 23.68 | 29.74 | 31.52 | c | 36.84 | 45.38 | a | 54.69 | b | 58.04 | d | 48.41 | a | 35.40 | f | 23.58 | d | 14.70 | a | 35.15 | |||||
| 2012 | 19.94 | 22.54 | c | 31.48 | 36.07 | 40.94 | 46.37 | 61.77 | a | 57.17 | b | 48.17 | 36.69 | e | 30.03 | 22.55 | 37.81 | |||||||||
| 2013 | 9.52 | 24.86 | 28.19 | 41.00 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 20.86 | ||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 21.92 | 24.83 | 30.15 | 33.90 | 42.34 | 49.34 | 59.06 | 56.13 | 47.10 | 36.19 | 27.70 | 22.10 | 37.77 | |||||||||||||
| S.D. | 5.21 | 2.61 | 2.36 | 2.32 | 2.46 | 2.17 | 3.22 | 2.24 | 2.24 | 1.59 | 3.24 | 3.37 | 0.47 | |||||||||||||
| SKEW | -0.75 | 0.94 | 0.08 | -0.11 | -0.22 | -0.24 | -0.05 | -0.59 | -0.15 | 0.89 | -0.40 | -0.17 | 0.00 | |||||||||||||
| MAX | 28.97 | 31.11 | 34.94 | 37.96 | 46.94 | 52.53 | 64.27 | 58.84 | 50.87 | 39.55 | 32.67 | 27.77 | 38.24 | |||||||||||||
| MIN | 9.52 | 20.86 | 26.03 | 28.90 | 36.84 | 45.38 | 54.26 | 51.29 | 43.73 | 34.10 | 21.07 | 14.70 | 37.05 | |||||||||||||
| NO YRS | 18 | 18 | 18 | 18 | 18 | 17 | 16 | 15 | 18 | 17 | 19 | 18 | 9 | |||||||||||||