| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1965 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 49.19 | 46.94 | 44.03 | 37.35 | 24.63 | 20.90 | 37.18 | |||||||
| 1966 | 4.19 | 23.14 | 24.81 | 32.00 | 37.26 | 45.63 | 50.52 | 48.97 | 44.97 | 33.81 | 20.87 | 19.29 | 32.12 | |||||||||||||
| 1967 | 15.97 | 22.96 | 19.90 | a | 29.93 | 39.55 | 47.40 | 49.96 | c | 49.81 | 45.70 | 38.39 | 28.40 | 22.84 | 34.23 | |||||||||||
| 1968 | 12.71 | 23.00 | 29.16 | 31.93 | 39.81 | 46.23 | 49.97 | 46.87 | 44.13 | 33.68 | 29.43 | 14.06 | 33.42 | |||||||||||||
| 1969 | 0.48 | 16.25 | 28.10 | 32.23 | 39.58 | 46.33 | 51.13 | 45.07 | a | 45.17 | 38.94 | 27.03 | 28.06 | 33.20 | ||||||||||||
| 1970 | 18.16 | 31.71 | 32.35 | 33.70 | 40.13 | 46.53 | 48.06 | 46.19 | 41.53 | 34.57 | a | 24.87 | 16.35 | 34.51 | ||||||||||||
| 1971 | 2.80 | a | 25.73 | b | 22.58 | 32.57 | 37.58 | 45.33 | 48.87 | 49.84 | 43.50 | 34.87 | 24.97 | 12.57 | a | 31.77 | ||||||||||
| 1972 | 6.32 | 12.52 | 21.19 | 28.07 | 36.48 | 44.17 | 48.74 | 49.39 | ----- | z | ----- | z | ----- | z | ----- | z | 30.86 | |||||||||
| 1973 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1974 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 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 | 45.83 | 39.68 | 32.41 | a | 19.50 | m | 39.31 | |||
| 1982 | 5.13 | 14.82 | 26.94 | 31.30 | 39.55 | 47.83 | 50.80 | a | 49.97 | a | 45.53 | 35.73 | a | 24.57 | 26.35 | 33.21 | ||||||||||
| 1983 | 18.74 | 27.38 | b | 27.84 | 31.73 | 42.29 | 47.73 | 48.26 | 47.61 | 38.07 | 34.32 | 24.10 | 14.97 | a | 33.59 | |||||||||||
| 1984 | 22.73 | a | 28.14 | 32.58 | 31.37 | 37.42 | 44.30 | 47.32 | 44.39 | 42.50 | 35.06 | 25.83 | 16.10 | a | 33.98 | |||||||||||
| 1985 | 31.57 | a | 18.14 | 29.71 | 32.80 | 40.94 | 45.30 | 50.03 | 49.71 | 43.61 | b | 34.94 | 14.63 | 27.16 | 34.88 | |||||||||||
| 1986 | 28.84 | 23.39 | 28.39 | 29.41 | a | 40.61 | 46.30 | g | 50.74 | 48.19 | 41.41 | a | 41.84 | 24.07 | 31.00 | 35.26 | ||||||||||
| 1987 | 25.52 | 27.68 | ----- | z | ----- | z | 41.74 | 44.27 | 48.90 | a | 46.35 | 41.26 | c | 38.42 | 30.73 | 28.20 | f | 38.32 | ||||||||
| 1988 | 20.09 | h | 21.43 | a | 30.39 | 33.03 | 39.47 | a | 45.63 | 43.84 | 46.25 | c | 40.83 | 38.10 | 29.17 | 26.00 | 35.83 | |||||||||
| 1989 | 14.39 | 17.50 | 21.58 | 33.10 | 41.97 | 47.24 | a | 51.20 | a | 48.41 | b | ----- | z | 34.29 | 24.00 | g | 29.72 | b | 33.94 | |||||||
| 1990 | 18.68 | 12.96 | 30.65 | 35.41 | c | 42.26 | 48.11 | k | 51.07 | a | 49.86 | b | 46.89 | k | 33.08 | f | 16.07 | a | 13.58 | 30.06 | ||||||
| 1991 | 17.45 | 30.58 | b | 26.58 | ----- | z | 40.16 | 46.07 | 51.55 | 49.81 | 46.60 | 34.32 | 29.41 | a | 24.90 | 36.13 | ||||||||||
| 1992 | 29.13 | 24.48 | 29.68 | ----- | z | 39.10 | 45.45 | a | 51.32 | 48.10 | 40.07 | c | 35.19 | 31.97 | 18.23 | a | 35.70 | |||||||||
| 1993 | 15.29 | 22.21 | 28.63 | a | 33.68 | k | 42.79 | c | 48.77 | 52.79 | b | 49.58 | 45.80 | 40.29 | 29.93 | 29.61 | c | 36.88 | ||||||||
| 1994 | 18.10 | 9.43 | 30.13 | 34.30 | c | 43.95 | j | 49.43 | 51.39 | 52.19 | 43.83 | 38.23 | 20.57 | 20.65 | 33.48 | |||||||||||
| 1995 | 23.04 | g | 20.43 | 23.17 | m | 33.24 | e | 43.82 | c | 48.70 | 53.03 | 50.35 | 47.97 | 38.90 | a | 22.95 | h | 19.58 | 39.56 | |||||||
| 1996 | 5.37 | a | 22.10 | 25.74 | 31.73 | d | 36.33 | v | 48.07 | 51.84 | 49.52 | j | ----- | z | ----- | z | ----- | z | ----- | z | 30.81 | |||||
| 1997 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 48.90 | 52.45 | 50.77 | 46.63 | ----- | z | ----- | z | 31.00 | 45.95 | ||||||
| 1998 | ----- | z | ----- | z | ----- | z | ----- | z | 37.86 | c | ----- | z | ----- | z | ----- | z | ----- | z | 36.67 | a | 27.43 | ----- | z | 33.99 | ||
| 1999 | ----- | z | ----- | z | 23.27 | a | ----- | z | 39.48 | ----- | z | 50.77 | 48.03 | 43.66 | a | 37.67 | a | 28.93 | 26.77 | e | 37.32 | |||||
| 2000 | 16.68 | ----- | z | ----- | z | ----- | z | 32.11 | c | 48.14 | b | 50.17 | a | 49.84 | 43.60 | ----- | z | 30.20 | 23.07 | a | 36.72 | |||||
| 2001 | 29.39 | 18.96 | 25.31 | b | ----- | z | 37.63 | a | 46.17 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 31.49 | |||
| 2002 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2003 | ----- | z | 28.50 | 25.19 | 33.80 | 40.68 | 49.23 | 52.97 | 49.87 | 45.50 | 39.74 | 24.33 | 25.87 | 37.79 | ||||||||||||
| 2004 | 17.10 | 32.07 | 25.67 | z | 35.47 | 44.03 | 49.80 | 51.94 | 49.84 | 44.43 | 37.32 | 34.33 | 26.84 | 38.47 | ||||||||||||
| 2005 | 18.29 | 23.57 | 32.39 | 37.00 | 43.97 | 48.57 | 51.77 | 50.81 | 47.23 | 37.81 | 30.67 | 29.16 | 37.60 | |||||||||||||
| 2006 | 23.35 | 22.46 | 22.19 | 34.67 | 41.61 | 48.13 | 50.35 | 50.84 | 45.40 | 39.03 | 15.87 | 28.48 | 35.20 | |||||||||||||
| 2007 | 25.77 | 18.79 | 21.65 | 33.47 | 40.97 | 47.67 | 50.16 | 50.26 | 45.90 | 37.71 | 32.87 | 20.87 | 35.51 | |||||||||||||
| 2008 | 17.94 | 20.97 | 29.23 | 34.10 | 41.00 | 46.63 | 49.19 | 48.52 | 46.07 | 37.48 | 31.50 | 18.26 | 35.07 | |||||||||||||
| 2009 | 15.71 | 19.86 | 24.77 | 32.53 | 40.90 | 48.30 | 52.03 | 50.58 | 44.73 | 39.90 | 30.57 | 24.42 | 35.36 | |||||||||||||
| 2010 | 24.61 | 30.57 | 31.48 | 34.87 | 41.77 | 48.47 | 51.10 | 50.90 | 44.53 | 39.97 | 30.60 | 18.94 | 37.32 | |||||||||||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 17.26 | 22.31 | 26.98 | 32.84 | 40.14 | 47.11 | 50.40 | 48.91 | 44.19 | 37.23 | 26.81 | 22.76 | 34.44 | |||||||||||||
| S.D. | 8.46 | 5.73 | 3.73 | 1.96 | 2.46 | 1.61 | 1.84 | 1.85 | 2.24 | 2.24 | 5.09 | 5.55 | 1.61 | |||||||||||||
| SKEW | -0.30 | -0.21 | -0.25 | -0.30 | -0.96 | -0.24 | -1.36 | -0.73 | -0.82 | -0.03 | -0.89 | -0.23 | 0.35 | |||||||||||||
| MAX | 31.57 | 32.07 | 32.58 | 37.00 | 44.03 | 49.80 | 53.03 | 52.19 | 47.97 | 41.84 | 34.33 | 31.00 | 37.60 | |||||||||||||
| MIN | 0.48 | 9.43 | 19.90 | 28.07 | 32.11 | 44.17 | 43.84 | 44.39 | 38.07 | 33.68 | 14.63 | 12.57 | 31.77 | |||||||||||||
| NO YRS | 29 | 31 | 29 | 26 | 32 | 31 | 34 | 33 | 31 | 31 | 31 | 31 | 16 | |||||||||||||