| 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 | 42.23 | ----- | z | ----- | z | 44.73 | 45.35 | 48.80 | 51.40 | k | 51.10 | 48.67 | 46.81 | 44.50 | 42.77 | 46.11 | ||||||||||
| 1997 | 41.00 | 38.93 | 42.06 | 43.00 | 48.84 | 50.93 | 54.52 | 54.52 | 52.93 | 48.48 | 46.90 | 38.68 | 46.73 | |||||||||||||
| 1998 | 46.13 | 43.36 | 42.77 | 41.60 | 46.58 | 51.30 | 54.71 | 53.77 | 49.55 | a | 45.84 | 45.03 | 37.61 | 46.52 | ||||||||||||
| 1999 | 39.83 | a | 42.23 | b | 38.46 | c | 40.85 | d | 44.46 | c | 48.65 | d | 50.68 | l | 52.25 | c | 46.56 | l | 44.00 | c | 47.00 | c | 40.03 | 43.78 | ||
| 2000 | 40.32 | 42.96 | b | 38.65 | 43.74 | g | 47.29 | 49.87 | 52.67 | j | 52.75 | c | 50.00 | b | 45.96 | c | 41.16 | e | 41.33 | d | 45.03 | |||||
| 2001 | 39.06 | 38.04 | 40.80 | a | 42.37 | 45.68 | c | 46.48 | i | 51.74 | 53.39 | 50.30 | c | 45.93 | c | 45.37 | 42.03 | 44.97 | ||||||||
| 2002 | 40.10 | 40.79 | 38.29 | 43.30 | 43.81 | 50.58 | f | 52.96 | d | 48.74 | d | 48.40 | e | 42.04 | c | 45.03 | 44.23 | 44.33 | ||||||||
| 2003 | 46.04 | c | 39.25 | 44.46 | c | 43.17 | a | 45.00 | 49.23 | d | 53.11 | c | 53.20 | f | 50.37 | 50.16 | 42.04 | c | 43.07 | c | 45.99 | |||||
| 2004 | 42.71 | 41.52 | 41.56 | f | 43.40 | 47.30 | a | 51.93 | b | 54.85 | d | 55.16 | 51.47 | 46.84 | 40.77 | 41.13 | 47.01 | |||||||||
| 2005 | 41.00 | 39.71 | 42.35 | 43.57 | 49.10 | 51.57 | 53.23 | 50.96 | g | 46.97 | 47.71 | 41.40 | 42.13 | 45.34 | ||||||||||||
| 2006 | 43.23 | 37.68 | 39.61 | 43.04 | e | 45.13 | 52.47 | 52.81 | 51.24 | j | 48.75 | f | 43.32 | 43.93 | 38.64 | f | 44.58 | |||||||||
| 2007 | 34.61 | 40.93 | 42.71 | 42.13 | 44.74 | 47.80 | 54.76 | f | 53.77 | 49.00 | e | 45.45 | 39.67 | 37.83 | h | 44.08 | ||||||||||
| 2008 | 37.42 | 37.55 | 38.50 | i | 38.77 | 46.48 | d | 46.73 | 51.32 | 52.64 | f | 47.33 | 45.10 | 45.17 | 36.89 | d | 43.28 | |||||||||
| 2009 | 38.00 | c | 39.18 | 39.23 | 39.87 | 46.06 | 50.87 | 51.81 | 50.26 | l | 49.50 | 46.19 | 41.87 | 36.06 | 43.51 | |||||||||||
| 2010 | 45.39 | 42.57 | 39.52 | 40.57 | 44.13 | 49.50 | 50.42 | 51.54 | e | 51.80 | 47.65 | n | 39.96 | g | 43.14 | c | 45.86 | |||||||||
| 2011 | 39.00 | b | 36.61 | 43.11 | m | 39.96 | e | 43.62 | e | 49.71 | f | 51.93 | d | 51.96 | f | 50.22 | g | 46.50 | a | 41.26 | k | 37.33 | p | 42.93 | ||
| 2012 | 38.48 | f | 38.83 | 37.92 | r | 34.30 | 44.59 | b | 49.21 | k | 53.45 | k | 51.28 | f | 47.12 | e | 46.90 | 40.93 | 26.19 | 39.84 | ||||||
| 2013 | 9.97 | 38.21 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 24.09 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 39.18 | 39.90 | 40.74 | 41.54 | 45.77 | 49.97 | 52.78 | 52.70 | 49.53 | 46.08 | 43.38 | 39.66 | 46.63 | |||||||||||||
| S.D. | 8.14 | 2.08 | 2.06 | 2.53 | 1.64 | 1.71 | 1.41 | 1.88 | 1.79 | 1.95 | 2.38 | 4.63 | 0.15 | |||||||||||||
| SKEW | -2.86 | 0.24 | 0.34 | -1.48 | 0.67 | -0.31 | 0.06 | -0.78 | 0.23 | -0.09 | 0.03 | -1.84 | -26.26 | |||||||||||||
| MAX | 46.13 | 43.36 | 44.46 | 44.73 | 49.10 | 52.47 | 54.85 | 55.16 | 52.93 | 50.16 | 47.00 | 44.23 | 46.73 | |||||||||||||
| MIN | 9.97 | 36.61 | 38.29 | 34.30 | 43.62 | 46.73 | 50.42 | 48.74 | 46.97 | 42.04 | 39.67 | 26.19 | 46.52 | |||||||||||||
| NO YRS | 17 | 17 | 12 | 16 | 17 | 13 | 12 | 10 | 14 | 16 | 15 | 14 | 2 | |||||||||||||