| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1956 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1957 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1958 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1959 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1960 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1961 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1962 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1963 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1964 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1965 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1966 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1967 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1968 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1969 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1970 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1971 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1972 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 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 | ----- | 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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1994 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1995 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1996 | 53.74 | ----- | z | ----- | z | 60.97 | 61.94 | 67.13 | 69.75 | k | 71.16 | 69.20 | 64.45 | 58.67 | 55.55 | 62.53 | ||||||||||
| 1997 | 55.19 | 57.11 | 57.45 | 60.07 | 68.90 | 68.00 | 71.65 | 74.55 | 72.27 | 64.10 | 60.80 | 57.32 | 63.95 | |||||||||||||
| 1998 | 56.48 | 55.86 | 58.32 | 58.73 | 61.90 | 64.23 | 69.00 | 71.68 | 69.80 | 66.74 | 58.00 | 52.13 | 61.91 | |||||||||||||
| 1999 | 54.65 | 53.04 | 55.39 | 58.00 | 60.00 | 65.47 | 67.79 | l | 69.84 | 70.44 | l | 65.89 | c | 60.07 | 55.68 | 59.80 | ||||||||||
| 2000 | 53.97 | 57.07 | 56.32 | 60.73 | 62.90 | 66.63 | 67.71 | j | 70.29 | 71.93 | 63.97 | 57.23 | 57.19 | 61.66 | ||||||||||||
| 2001 | 57.65 | 55.07 | 57.58 | 57.17 | 64.58 | 64.43 | i | 67.74 | 69.68 | 70.97 | 65.87 | 59.80 | 54.68 | 61.89 | ||||||||||||
| 2002 | 53.32 | 57.61 | 55.32 | 59.40 | 61.77 | 67.29 | f | 71.56 | d | 71.52 | d | 71.36 | e | 64.43 | c | 64.27 | 58.00 | 62.60 | ||||||||
| 2003 | 60.64 | c | 57.93 | 57.21 | c | 57.34 | a | 64.74 | 69.35 | d | 70.64 | c | 72.12 | f | 72.20 | 69.45 | 57.15 | c | 56.79 | c | 63.04 | |||||
| 2004 | 55.71 | 57.00 | 59.56 | f | 64.43 | 65.23 | a | 67.07 | b | 72.59 | d | 73.39 | 71.13 | 64.97 | 59.47 | 57.26 | 64.39 | |||||||||
| 2005 | 57.10 | 60.68 | 62.39 | 59.77 | 65.61 | 66.20 | 70.84 | 71.62 | g | 68.70 | 64.42 | 57.37 | 56.61 | 62.70 | ||||||||||||
| 2006 | 56.16 | 58.54 | 54.58 | 59.80 | e | 64.90 | 65.97 | 69.94 | 69.00 | j | 69.16 | e | 66.23 | 57.27 | 57.84 | f | 62.25 | |||||||||
| 2007 | 53.52 | 54.07 | 59.48 | 59.93 | 62.55 | 66.53 | 71.84 | f | 71.58 | 68.44 | e | 64.74 | 58.93 | 52.70 | h | 61.98 | ||||||||||
| 2008 | 51.77 | 54.83 | 55.86 | i | 56.77 | 63.59 | d | 63.27 | 70.19 | 70.04 | f | 68.37 | 66.19 | 61.83 | 52.04 | d | 60.89 | |||||||||
| 2009 | 57.23 | 57.25 | 54.71 | 59.33 | 61.87 | 65.67 | 69.32 | 70.58 | l | 72.63 | 65.19 | 60.00 | 54.32 | 61.59 | ||||||||||||
| 2010 | 57.19 | 57.04 | 57.87 | 57.83 | 60.77 | 64.13 | 67.39 | 69.04 | e | 70.87 | 68.71 | n | 55.65 | g | 54.73 | e | 61.69 | |||||||||
| 2011 | 58.28 | b | 53.56 | a | 56.28 | m | 56.88 | d | 60.21 | g | 65.70 | g | 69.15 | d | 72.38 | g | 71.75 | f | 67.00 | a | 57.68 | k | 55.53 | p | 60.97 | |
| 2012 | 56.17 | h | 55.90 | 55.25 | s | 47.23 | 62.34 | b | 66.37 | k | 68.26 | l | 70.52 | f | 69.21 | f | 64.90 | 53.10 | 35.06 | 53.09 | ||||||
| 2013 | 13.84 | 55.82 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 34.83 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 53.32 | 56.37 | 57.22 | 58.49 | 63.35 | 66.13 | 70.00 | 71.27 | 70.50 | 65.53 | 58.93 | 54.10 | 62.93 | |||||||||||||
| S.D. | 10.41 | 1.92 | 2.23 | 3.46 | 2.22 | 1.65 | 1.57 | 1.70 | 1.52 | 1.41 | 2.54 | 5.78 | 1.44 | |||||||||||||
| SKEW | -3.47 | 0.15 | 0.89 | -1.85 | 0.81 | 0.09 | -0.07 | 0.59 | -0.14 | 1.36 | -0.14 | -2.77 | 0.03 | |||||||||||||
| MAX | 60.64 | 60.68 | 62.39 | 64.43 | 68.90 | 69.35 | 72.59 | 74.55 | 72.63 | 69.45 | 64.27 | 58.00 | 63.95 | |||||||||||||
| MIN | 13.84 | 53.04 | 54.58 | 47.23 | 60.00 | 63.27 | 67.39 | 69.04 | 68.37 | 63.97 | 53.10 | 35.06 | 61.91 | |||||||||||||
| NO YRS | 17 | 17 | 12 | 17 | 16 | 13 | 12 | 10 | 14 | 16 | 15 | 14 | 2 | |||||||||||||