| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1950 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1951 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1952 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1953 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1954 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1955 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 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 | 53.95 | 46.43 | 39.90 | 46.76 | ||||
| 1990 | 42.58 | 41.12 | 48.87 | 54.38 | 55.71 | 61.88 | 70.19 | 69.48 | 64.85 | 52.39 | 45.30 | 33.31 | 53.34 | |||||||||||||
| 1991 | 37.05 | 48.29 | 44.29 | 49.17 | 52.53 | 59.07 | 69.56 | 68.66 | 65.33 | 55.31 | 48.20 | 41.21 | 53.22 | |||||||||||||
| 1992 | 43.06 | 47.83 | 50.89 | 54.47 | ----- | z | 65.93 | 68.50 | 69.27 | 62.45 | 55.50 | 46.27 | 39.44 | 54.87 | ||||||||||||
| 1993 | 36.63 | 37.84 | 50.74 | 51.17 | 58.85 | 61.08 | 64.02 | 66.85 | 64.65 | 57.11 | 40.53 | 40.42 | 52.49 | |||||||||||||
| 1994 | 43.37 | 42.09 | 49.10 | 52.83 | 58.63 | 60.70 | 70.50 | 67.35 | 65.70 | 53.42 | 42.13 | 43.29 | 54.09 | |||||||||||||
| 1995 | 43.45 | 49.39 | 47.61 | 50.32 | 58.10 | 62.03 | 69.39 | 66.44 | 66.72 | 54.45 | 51.02 | 45.53 | 55.37 | |||||||||||||
| 1996 | 43.42 | 45.26 | 48.50 | 52.35 | 55.05 | 62.62 | 72.55 | 70.16 | 61.43 | 54.94 | 48.27 | 43.48 | 54.84 | |||||||||||||
| 1997 | 42.32 | 44.73 | 48.34 | 51.58 | 62.27 | 63.13 | 68.60 | 70.21 | 63.65 | 53.18 | 48.58 | 40.13 | 54.73 | |||||||||||||
| 1998 | 44.97 | 45.55 | 47.42 | 50.87 | 54.69 | 62.27 | 70.42 | 69.66 | 65.37 | 53.74 | 47.47 | a | 38.84 | 54.27 | ||||||||||||
| 1999 | 42.47 | 43.34 | 45.40 | 49.47 | 53.74 | 60.97 | 66.65 | 68.10 | 63.45 | 54.95 | 50.58 | 41.77 | 53.41 | |||||||||||||
| 2000 | 41.65 | 46.69 | 45.58 | 53.23 | 57.45 | 65.45 | 67.27 | 68.11 | 63.43 | 55.40 | a | 42.64 | a | 42.15 | 54.09 | |||||||||||
| 2001 | 41.32 | 41.73 | 47.44 | 49.27 | 58.94 | 60.68 | 67.26 | 68.29 | 64.12 | 54.40 | 48.78 | 42.24 | 53.71 | |||||||||||||
| 2002 | 42.89 | 44.43 | 44.45 | 51.93 | 55.31 | 63.78 | 71.26 | 68.81 | 64.27 | 51.61 | 45.78 | 44.52 | 54.09 | |||||||||||||
| 2003 | 46.58 | 43.88 | 49.44 | 49.25 | 56.60 | 65.42 | 71.63 | 70.45 | 65.92 | 57.94 | 44.95 | ----- | z | 56.55 | ||||||||||||
| 2004 | 43.82 | 44.47 | 51.15 | 53.42 | 58.85 | 63.83 | 70.87 | 71.06 | 62.67 | 55.76 | 46.17 | 43.56 | 55.47 | |||||||||||||
| 2005 | 42.00 | 44.41 | 50.84 | 51.32 | 59.16 | 61.63 | 70.69 | 71.77 | 62.07 | 56.27 | 45.27 | 41.79 | 54.77 | |||||||||||||
| 2006 | 43.79 | 43.05 | 45.27 | 52.27 | 59.53 | 66.02 | 72.08 | 68.81 | 64.50 | 54.00 | 47.30 | 42.50 | 54.93 | |||||||||||||
| 2007 | 38.11 | 44.30 | 49.97 | 51.82 | 58.45 | 63.85 | 71.31 | 68.69 | 62.38 | 52.89 | 44.13 | 41.84 | 53.98 | |||||||||||||
| 2008 | 37.90 | 43.17 | 44.89 | 47.68 | 58.00 | 60.82 | 70.95 | 70.02 | 64.02 | 54.10 | 49.42 | 39.40 | 53.36 | |||||||||||||
| 2009 | 40.05 | 43.45 | 44.65 | 49.95 | 59.05 | 65.35 | 73.06 | 70.19 | 65.22 | 52.98 | 45.28 | 37.32 | 53.88 | |||||||||||||
| 2010 | 47.40 | 47.16 | 46.95 | 49.37 | 54.45 | 61.57 | 70.03 | 69.10 | 64.35 | 55.55 | 46.87 | 43.79 | 54.72 | |||||||||||||
| 2011 | 43.05 | 41.21 | 47.03 | 47.92 | 53.89 | 61.52 | 66.16 | 69.48 | 67.38 | 55.13 | 45.93 | 38.48 | 53.10 | |||||||||||||
| 2012 | 41.71 | 43.28 | 45.03 | 52.90 | 56.45 | 60.53 | 67.69 | 70.76 | 65.30 | 55.52 | 49.12 | 42.18 | 54.21 | |||||||||||||
| 2013 | 38.31 | 43.68 | 48.65 | 57.00 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 36.00 | z | 43.54 | ||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 42.00 | 44.18 | 47.60 | 51.17 | 57.08 | 62.61 | 69.59 | 69.21 | 64.31 | 54.60 | 46.52 | 41.18 | 54.10 | |||||||||||||
| S.D. | 2.79 | 2.55 | 2.26 | 1.94 | 2.41 | 1.99 | 2.25 | 1.33 | 1.50 | 1.48 | 2.58 | 2.68 | 0.78 | |||||||||||||
| SKEW | -0.32 | -0.08 | 0.03 | -0.06 | -0.04 | 0.37 | -0.68 | -0.20 | 0.02 | 0.12 | -0.38 | -1.00 | -0.21 | |||||||||||||
| MAX | 47.40 | 49.39 | 51.15 | 54.47 | 62.27 | 66.02 | 73.06 | 71.77 | 67.38 | 57.94 | 51.02 | 45.53 | 55.47 | |||||||||||||
| MIN | 36.63 | 37.84 | 44.29 | 47.68 | 52.53 | 59.07 | 64.02 | 66.44 | 61.43 | 51.61 | 40.53 | 33.31 | 52.49 | |||||||||||||
| NO YRS | 24 | 24 | 24 | 23 | 22 | 23 | 23 | 23 | 23 | 24 | 24 | 23 | 21 | |||||||||||||