| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1962 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 34.23 | r | 29.17 | 25.19 | 27.18 | |||
| 1963 | 13.29 | 30.89 | 27.84 | 33.47 | 44.81 | 49.57 | 51.13 | 50.74 | 47.63 | 39.10 | 27.07 | 18.03 | 36.13 | |||||||||||||
| 1964 | 15.16 | 14.10 | 25.13 | 30.80 | 37.71 | 46.70 | 53.63 | a | 47.03 | 40.17 | 32.77 | 23.73 | 20.87 | 32.32 | ||||||||||||
| 1965 | 19.06 | 25.00 | 21.23 | 36.77 | 40.81 | 48.03 | 52.61 | 52.48 | 37.80 | 34.74 | 28.90 | 16.87 | 34.53 | |||||||||||||
| 1966 | ----- | z | 21.93 | 26.03 | 32.13 | 41.68 | 45.17 | 53.29 | 53.03 | a | 47.43 | 30.39 | 29.73 | 24.55 | 36.85 | |||||||||||
| 1967 | 24.84 | 26.46 | 27.58 | 30.10 | 40.06 | 47.20 | 56.13 | 52.57 | a | 45.13 | 33.16 | ----- | z | 17.16 | 36.40 | |||||||||||
| 1968 | 18.26 | 29.14 | 28.45 | 29.03 | 39.27 | a | 48.39 | b | 54.53 | a | 49.72 | b | ----- | z | 31.27 | e | 29.18 | b | 21.65 | 34.44 | ||||||
| 1969 | 17.94 | 19.00 | 25.74 | 34.31 | a | 44.93 | a | 48.60 | 54.39 | 49.00 | c | 43.86 | b | 30.26 | 23.50 | 23.45 | 34.58 | |||||||||
| 1970 | 25.10 | a | 26.89 | 28.16 | 28.07 | a | 40.71 | 49.57 | 54.00 | 49.48 | 39.07 | 29.41 | b | 28.23 | 17.13 | a | 34.65 | |||||||||
| 1971 | 21.30 | d | 23.93 | a | 23.06 | 31.37 | 41.31 | b | 45.73 | 54.70 | a | 60.69 | b | ----- | z | 30.43 | a | 23.59 | a | 15.87 | 33.82 | |||||
| 1972 | 17.06 | 21.52 | 31.10 | 29.83 | 41.06 | 49.77 | 52.55 | 52.58 | 35.88 | m | 32.58 | 27.47 | ----- | z | 35.55 | |||||||||||
| 1973 | 18.79 | q | 26.35 | e | 28.61 | h | 33.60 | ----- | z | 47.59 | c | ----- | z | ----- | z | ----- | z | 31.50 | w | 27.70 | 27.00 | c | 32.45 | |||
| 1974 | 17.97 | 25.96 | 28.35 | ----- | z | 40.09 | i | 52.72 | a | 54.71 | 51.65 | 44.43 | 35.83 | g | 28.32 | b | 21.41 | b | 36.17 | |||||||
| 1975 | 16.06 | 23.81 | a | 28.67 | d | 31.28 | a | 40.85 | e | 47.15 | d | 59.79 | b | 51.56 | d | 42.74 | g | 37.34 | b | 24.04 | d | 19.36 | c | 34.54 | ||
| 1976 | 18.29 | q | 20.88 | d | 24.35 | e | 31.21 | k | 40.48 | j | 43.07 | p | 57.08 | e | 51.53 | a | 48.12 | e | 34.25 | g | 27.76 | i | 16.04 | f | 40.39 | |
| 1977 | 9.00 | e | 20.00 | i | 25.78 | h | 35.10 | j | 39.04 | f | 55.65 | m | 53.73 | p | 58.17 | g | 42.89 | l | 37.29 | g | 25.93 | c | 27.61 | 20.85 | ||
| 1978 | 24.21 | b | 29.93 | 34.10 | 36.10 | 40.55 | 48.37 | 57.12 | e | 51.81 | 47.54 | f | 35.61 | 23.31 | a | 14.00 | a | 35.92 | ||||||||
| 1979 | 4.53 | a | 22.44 | a | 30.87 | 34.33 | 44.03 | ----- | z | 55.73 | p | 56.93 | b | 47.58 | d | 41.00 | a | 24.50 | 23.48 | b | 32.97 | |||||
| 1980 | 19.61 | 30.10 | 28.77 | 37.41 | a | 44.23 | 45.15 | d | 56.42 | e | 56.10 | u | 49.54 | b | 37.94 | 27.31 | d | 23.21 | b | 36.34 | ||||||
| 1981 | 26.90 | 22.67 | g | 31.00 | n | 35.85 | d | 41.42 | 47.41 | a | 53.52 | 56.96 | c | 45.97 | a | 34.00 | a | 30.33 | c | 24.58 | 39.69 | |||||
| 1982 | 14.93 | a | 20.89 | 30.19 | 31.27 | 40.55 | 51.80 | 55.48 | 55.39 | 45.67 | 36.10 | 23.10 | 21.06 | 35.54 | ||||||||||||
| 1983 | 24.45 | 30.04 | 34.68 | 34.23 | 43.45 | 50.30 | 54.19 | 58.90 | 45.67 | 38.68 | 30.60 | 16.13 | 38.44 | |||||||||||||
| 1984 | 14.19 | 21.34 | 30.13 | 34.83 | 41.13 | 46.67 | 57.10 | 56.16 | 43.40 | 34.50 | a | 29.77 | 12.03 | 35.10 | ||||||||||||
| 1985 | 13.45 | 16.54 | 26.10 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 4.55 | 15.16 | |||||
| 1986 | 16.30 | a | 28.75 | 33.74 | 32.00 | 40.94 | 47.90 | 52.84 | 57.81 | 43.50 | 37.90 | 27.25 | b | 20.61 | 36.63 | |||||||||||
| 1987 | 14.90 | 26.36 | 29.90 | 36.43 | 46.06 | 49.47 | ----- | z | ----- | z | ----- | z | 37.68 | 29.62 | a | 22.32 | 32.53 | |||||||||
| 1988 | 15.90 | a | ----- | z | 24.97 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 42.80 | 39.87 | 26.67 | 18.06 | 28.04 | ||||||
| 1989 | 11.71 | 11.52 | a | 28.50 | o | 39.67 | o | ----- | z | ----- | z | 56.19 | 57.06 | ----- | z | ----- | z | ----- | z | ----- | z | 34.12 | ||||
| 1990 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 24.00 | 4.52 | 14.26 | |||
| 1991 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1992 | ----- | z | ----- | z | ----- | z | ----- | z | 44.35 | 53.33 | 52.42 | 53.52 | 42.80 | 35.35 | 23.77 | 12.16 | 39.71 | |||||||||
| 1993 | 11.23 | 14.32 | 26.10 | 33.27 | 44.55 | 45.43 | 48.32 | 48.52 | 41.70 | 34.87 | 15.00 | 22.48 | 32.15 | |||||||||||||
| 1994 | 24.52 | 21.46 | 29.03 | 38.67 | 46.16 | 49.93 | 60.71 | 55.00 | 47.27 | 31.71 | 21.73 | 13.94 | 36.68 | |||||||||||||
| 1995 | 24.68 | 28.57 | 29.71 | 32.53 | 43.71 | ----- | z | 55.29 | 46.65 | 44.77 | 27.61 | 29.17 | 21.42 | 34.92 | ||||||||||||
| 1996 | 22.03 | 22.28 | 29.42 | 32.53 | 40.77 | 47.20 | 56.13 | 50.74 | 42.03 | 32.35 | 26.27 | 24.19 | 35.50 | |||||||||||||
| 1997 | 21.74 | 25.14 | 27.39 | 32.73 | 42.32 | ----- | z | 54.55 | 51.68 | 44.40 | 33.45 | 25.37 | 20.10 | 34.44 | ||||||||||||
| 1998 | 25.48 | 25.68 | 29.35 | 34.33 | 42.81 | 48.40 | ----- | z | 56.48 | 50.73 | 33.32 | 31.20 | 18.23 | 36.00 | ||||||||||||
| 1999 | 24.19 | 24.61 | 30.73 | a | 33.33 | 38.55 | 49.70 | 53.30 | a | 54.61 | 43.03 | 33.35 | 29.37 | 21.58 | 36.36 | |||||||||||
| 2000 | 24.13 | 29.72 | 29.32 | 38.53 | 45.26 | 51.20 | 57.57 | a | 55.61 | 43.07 | 35.65 | 22.13 | 22.19 | 37.87 | ||||||||||||
| 2001 | 18.07 | a | 20.61 | 31.94 | 34.37 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 27.56 | c | 21.77 | 25.72 | |||||
| 2002 | 22.61 | 19.43 | 28.10 | 35.39 | b | 41.70 | a | 52.97 | 60.45 | 52.39 | c | 44.27 | 34.00 | t | ----- | z | ----- | z | 39.70 | |||||||
| 2003 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2004 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2005 | ----- | z | ----- | z | ----- | z | ----- | z | 44.06 | m | 46.37 | 55.26 | 55.74 | 41.73 | 35.23 | 24.00 | 14.87 | 39.03 | ||||||||
| 2006 | 24.06 | 20.07 | 30.03 | 35.80 | 42.26 | 53.20 | 60.77 | 53.00 | a | 43.00 | 32.61 | 27.40 | 16.52 | 36.56 | ||||||||||||
| 2007 | 14.45 | 26.00 | 31.26 | 34.40 | 43.71 | 51.23 | 62.84 | 54.58 | 45.43 | 34.42 | 24.27 | 21.61 | 37.02 | |||||||||||||
| 2008 | 14.97 | 24.79 | 26.29 | 27.67 | 43.77 | 49.17 | 58.29 | 55.13 | 44.17 | 34.77 | 28.60 | 15.74 | 35.28 | |||||||||||||
| 2009 | 21.61 | 23.75 | 26.74 | 34.13 | 42.45 | 51.90 | 57.26 | 56.13 | 46.97 | 33.81 | 23.87 | 12.68 | 35.94 | |||||||||||||
| 2010 | 22.90 | 28.18 | 29.42 | 33.90 | 39.00 | 49.83 | 54.58 | 53.16 | 45.90 | 43.50 | z | ----- | z | ----- | z | 39.65 | ||||||||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 18.79 | 23.81 | 28.53 | 33.47 | 42.20 | 48.95 | 55.53 | 53.41 | 44.52 | 34.38 | 26.32 | 19.03 | 35.63 | |||||||||||||
| S.D. | 5.27 | 4.70 | 2.89 | 2.68 | 2.15 | 2.34 | 2.96 | 3.25 | 2.83 | 3.08 | 3.20 | 5.19 | 1.64 | |||||||||||||
| SKEW | -0.49 | -0.65 | -0.14 | -0.20 | 0.02 | 0.25 | 0.34 | -0.05 | -0.12 | 0.10 | -1.02 | -0.93 | -0.58 | |||||||||||||
| MAX | 26.90 | 30.89 | 34.68 | 38.67 | 46.16 | 53.33 | 62.84 | 60.69 | 50.73 | 41.00 | 31.20 | 27.61 | 38.44 | |||||||||||||
| MIN | 4.53 | 11.52 | 21.23 | 27.67 | 37.71 | 45.15 | 48.32 | 46.65 | 37.80 | 27.61 | 15.00 | 4.52 | 32.15 | |||||||||||||
| NO YRS | 39 | 39 | 38 | 36 | 35 | 35 | 36 | 37 | 33 | 35 | 40 | 41 | 18 | |||||||||||||