| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1965 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 68.74 | 69.10 | 61.63 | 48.58 | 34.00 | 30.45 | 52.08 | |||||||
| 1966 | 11.81 | 34.75 | 36.39 | 50.90 | 53.90 | 67.30 | 68.45 | 64.16 | 57.53 | 44.35 | 31.37 | 27.65 | 45.71 | |||||||||||||
| 1967 | 25.71 | 33.14 | 33.23 | a | 50.27 | 58.77 | 68.67 | 66.29 | c | 66.32 | 58.73 | 48.61 | 38.30 | 31.16 | 48.27 | |||||||||||
| 1968 | 25.06 | 34.66 | 43.10 | 48.50 | 64.03 | 67.53 | 72.65 | 69.81 | 56.50 | 47.32 | 39.43 | 21.94 | 49.21 | |||||||||||||
| 1969 | 9.58 | 30.32 | 40.23 | 52.67 | 62.94 | 71.33 | 63.90 | 63.37 | a | 61.13 | 53.90 | 38.13 | 38.26 | 48.81 | ||||||||||||
| 1970 | 27.10 | 43.50 | 45.10 | 50.80 | 57.58 | 63.70 | 64.19 | 63.39 | 56.17 | 47.13 | a | 36.43 | 25.94 | 48.42 | ||||||||||||
| 1971 | 15.61 | 35.00 | 35.55 | 47.43 | 54.13 | 68.70 | 70.94 | 65.35 | 57.10 | 45.84 | 35.20 | 25.17 | a | 46.33 | ||||||||||||
| 1972 | 18.68 | 23.86 | 33.42 | 44.93 | 57.87 | 63.23 | 73.68 | 64.77 | ----- | z | ----- | z | ----- | z | ----- | z | 47.56 | |||||||||
| 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 | 55.60 | 50.65 | 41.07 | a | 28.11 | m | 49.10 | |||
| 1982 | 12.10 | 28.04 | a | 38.58 | 47.63 | 55.68 | 68.00 | 70.33 | a | 65.67 | a | 59.40 | 48.00 | a | 34.00 | 34.74 | 46.85 | |||||||||
| 1983 | 29.03 | 37.07 | 43.52 | 54.20 | 60.52 | 67.73 | 69.55 | 63.03 | 56.77 | 47.35 | 36.00 | 25.61 | 49.20 | |||||||||||||
| 1984 | 33.81 | 39.72 | 47.87 | 54.33 | 61.97 | 64.10 | 64.29 | c | 65.13 | 59.47 | 46.77 | 34.83 | 26.23 | a | 49.88 | |||||||||||
| 1985 | 40.16 | 29.71 | 40.77 | 47.07 | 58.48 | 63.50 | 68.10 | 66.10 | 59.82 | b | 45.84 | 27.03 | 36.81 | 48.62 | ||||||||||||
| 1986 | 36.68 | 34.11 | 40.77 | 45.21 | a | 57.74 | 66.52 | g | 68.03 | 62.65 | 61.07 | a | 50.65 | 34.13 | 39.03 | 48.19 | ||||||||||
| 1987 | 36.17 | a | 36.64 | ----- | z | ----- | z | 56.77 | 60.73 | 69.10 | a | 68.48 | 56.48 | g | 48.61 | 41.93 | 37.13 | a | 50.62 | |||||||
| 1988 | 29.55 | 34.38 | 43.74 | 51.20 | 58.27 | a | 64.73 | 62.68 | 62.07 | d | 57.83 | 48.90 | 39.40 | 35.71 | 49.04 | |||||||||||
| 1989 | 26.03 | 31.64 | 37.00 | 56.40 | 60.48 | 65.47 | 70.63 | a | 69.85 | e | ----- | z | 47.16 | 31.96 | f | 39.48 | b | 50.41 | ||||||||
| 1990 | 27.66 | b | 25.82 | 42.35 | 54.67 | c | 61.97 | 67.11 | k | 71.37 | a | 68.79 | c | 59.74 | k | 45.48 | f | 25.60 | 26.65 | 44.98 | ||||||
| 1991 | 27.32 | 39.43 | 39.74 | ----- | z | 59.45 | 66.50 | 65.13 | 62.32 | 55.50 | 46.74 | 37.41 | a | 35.00 | 48.60 | |||||||||||
| 1992 | 37.65 | 33.21 | 42.45 | ----- | z | 56.97 | 67.50 | b | 65.19 | 63.35 | 52.18 | b | 44.81 | 40.50 | 27.13 | 48.27 | ||||||||||
| 1993 | 28.13 | 35.32 | 42.66 | b | 55.47 | k | 66.46 | c | 69.03 | 71.69 | b | 67.71 | 59.87 | 50.47 | a | 40.77 | 38.61 | c | 51.88 | |||||||
| 1994 | 27.29 | 18.96 | 42.71 | 54.19 | c | 61.67 | j | 66.20 | 69.84 | 70.65 | 57.83 | 48.61 | 31.57 | 29.35 | 47.02 | |||||||||||
| 1995 | 32.38 | g | 33.00 | 39.32 | l | 52.12 | e | 64.57 | c | 64.79 | b | 67.03 | 65.19 | 63.00 | 49.17 | b | 31.22 | g | 25.68 | 53.84 | ||||||
| 1996 | 14.35 | 33.38 | 40.74 | 51.23 | d | 65.12 | w | 66.20 | 70.77 | 65.05 | j | ----- | z | ----- | z | ----- | z | ----- | z | 46.11 | ||||||
| 1997 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 67.67 | 64.65 | 66.77 | 58.93 | ----- | z | ----- | z | 40.65 | 59.73 | ||||||
| 1998 | ----- | z | ----- | z | ----- | z | ----- | z | 58.29 | c | ----- | z | ----- | z | ----- | z | ----- | z | 48.67 | a | 36.83 | ----- | z | 47.93 | ||
| 1999 | ----- | z | ----- | z | 36.48 | d | ----- | z | 55.84 | ----- | z | 68.55 | 65.48 | 54.90 | a | 46.03 | a | 37.43 | 35.93 | c | 50.08 | |||||
| 2000 | 25.29 | ----- | z | ----- | z | ----- | z | 56.79 | b | 63.29 | b | 62.80 | a | 62.33 | a | 54.77 | ----- | z | 39.27 | 32.13 | a | 49.58 | ||||
| 2001 | 38.55 | 33.11 | 37.79 | c | ----- | z | 56.27 | a | 66.69 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 46.48 | |||
| 2002 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2003 | ----- | z | 35.89 | 37.16 | 52.67 | 56.13 | 61.30 | 65.84 | 63.74 | 56.10 | 50.35 | 35.70 | 35.23 | 50.01 | ||||||||||||
| 2004 | 26.42 | 41.59 | 36.00 | z | 49.10 | 60.94 | 66.77 | 66.29 | 68.42 | 55.27 | 47.16 | 40.90 | 36.55 | 50.85 | ||||||||||||
| 2005 | 27.16 | 33.71 | 42.71 | 53.10 | 61.90 | 63.67 | 62.81 | 63.55 | 55.33 | 47.97 | 38.63 | 37.65 | 49.02 | |||||||||||||
| 2006 | 30.55 | 34.07 | 33.32 | 46.20 | 55.00 | 61.17 | 62.87 | 59.26 | 56.00 | 47.77 | 21.47 | 36.94 | 45.38 | |||||||||||||
| 2007 | 34.45 | 26.04 | 31.23 | 46.10 | 53.90 | 61.57 | 61.32 | 63.13 | 54.97 | 47.03 | 40.37 | 28.26 | 45.70 | |||||||||||||
| 2008 | 27.23 | 32.31 | 39.87 | 45.90 | 55.39 | 57.33 | 58.74 | 59.00 | 54.23 | 45.71 | 39.27 | 25.52 | 45.04 | |||||||||||||
| 2009 | 25.42 | 30.11 | 34.00 | 47.10 | 57.94 | 62.53 | 68.97 | 61.19 | 56.47 | 48.06 | 38.57 | 31.94 | 46.86 | |||||||||||||
| 2010 | 32.13 | 39.57 | 41.16 | 49.93 | 60.00 | 60.70 | 60.10 | 62.29 | 58.27 | 48.32 | 39.17 | 25.16 | 48.07 | |||||||||||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 26.89 | 33.29 | 39.44 | 50.15 | 58.65 | 65.08 | 66.93 | 64.92 | 57.41 | 47.95 | 36.28 | 31.99 | 47.67 | |||||||||||||
| S.D. | 8.05 | 5.17 | 4.08 | 3.32 | 3.22 | 3.11 | 3.74 | 2.99 | 2.50 | 1.95 | 4.77 | 5.47 | 1.57 | |||||||||||||
| SKEW | -0.53 | -0.57 | -0.21 | 0.05 | 0.55 | -0.35 | -0.26 | 0.14 | 0.30 | 0.76 | -1.48 | -0.10 | -0.37 | |||||||||||||
| MAX | 40.16 | 43.50 | 47.87 | 56.40 | 66.46 | 71.33 | 73.68 | 70.65 | 63.00 | 53.90 | 41.93 | 40.65 | 49.88 | |||||||||||||
| MIN | 9.58 | 18.96 | 31.23 | 44.93 | 53.90 | 57.33 | 58.74 | 59.00 | 52.18 | 44.35 | 21.47 | 21.94 | 45.04 | |||||||||||||
| NO YRS | 30 | 31 | 29 | 26 | 32 | 31 | 34 | 33 | 30 | 31 | 31 | 32 | 17 | |||||||||||||