| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1971 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 46.88 | n | 43.34 | b | 43.34 | |
| 1972 | 43.35 | 48.38 | 51.42 | 47.82 | 54.13 | 58.80 | 61.93 | a | 62.08 | a | 58.78 | 54.34 | 50.70 | 43.03 | 52.90 | |||||||||||
| 1973 | 44.74 | 50.09 | 46.90 | 51.55 | 55.94 | 59.72 | 61.35 | 60.56 | 61.30 | 53.77 | 46.77 | 47.03 | 53.31 | |||||||||||||
| 1974 | 40.85 | 43.93 | 46.85 | 48.45 | 52.94 | 56.60 | 60.42 | 61.73 | 60.48 | 53.37 | 48.77 | 45.37 | 51.65 | |||||||||||||
| 1975 | 45.19 | 45.12 | 45.35 | 45.15 | 52.90 | 56.82 | 61.06 | 60.18 | 59.15 | 53.92 | 45.98 | 45.02 | 51.32 | |||||||||||||
| 1976 | 44.79 | 43.50 | 44.52 | 46.50 | 52.58 | 54.12 | 60.03 | 60.84 | 60.27 | 54.47 | 52.05 | 42.98 | 51.39 | |||||||||||||
| 1977 | 43.81 | 50.00 | 44.98 | 50.10 | 51.11 | 58.35 | 59.45 | 63.24 | 58.52 | 55.19 | 47.75 | 48.35 | 52.57 | |||||||||||||
| 1978 | 47.53 | 48.80 | 51.82 | 49.72 | 52.65 | 60.30 | 61.92 | 62.90 | 59.60 | 56.34 | 44.90 | 39.92 | 53.03 | |||||||||||||
| 1979 | 41.05 | 45.36 | 49.94 | 50.82 | 54.35 | 57.15 | 62.19 | 62.42 | 63.25 | 57.24 | 48.32 | 47.31 | 53.28 | |||||||||||||
| 1980 | 42.05 | 49.69 | 46.84 | 50.68 | 52.53 | a | 55.78 | 61.40 | 59.60 | 59.18 | 55.79 | 50.90 | 48.05 | 52.71 | ||||||||||||
| 1981 | 49.23 | 47.79 | 49.03 | 50.37 | 53.53 | 58.17 | 60.45 | 62.56 | 60.37 | 53.89 | 50.00 | 47.84 | 53.60 | |||||||||||||
| 1982 | 42.23 | 45.23 | 46.37 | 47.45 | 52.31 | 57.55 | 59.76 | 61.53 | 59.98 | 55.50 | 47.00 | 44.79 | 51.64 | |||||||||||||
| 1983 | 46.40 | 49.02 | 51.02 | 49.90 | 54.31 | 57.85 | 60.87 | 62.73 | 59.42 | 55.65 | 50.42 | 44.92 | 53.54 | |||||||||||||
| 1984 | 46.05 | 47.07 | 50.24 | 48.68 | 53.47 | 56.17 | 59.98 | 61.92 | 59.67 | 53.40 | 48.30 | 41.87 | 52.24 | |||||||||||||
| 1985 | 43.98 | 44.02 | 44.58 | 51.28 | 53.27 | 57.98 | 62.77 | 60.53 | 58.63 | 53.47 | 42.50 | 43.65 | 51.39 | |||||||||||||
| 1986 | 47.76 | 49.09 | 51.44 | 49.47 | 53.98 | 59.47 | 60.94 | 62.44 | 58.23 | 56.05 | 50.30 | 45.65 | 53.73 | |||||||||||||
| 1987 | 44.47 | 46.54 | 49.48 | 52.52 | 56.69 | 58.07 | 59.92 | 61.60 | 59.57 | 56.45 | 50.82 | 43.53 | 53.30 | |||||||||||||
| 1988 | 44.73 | 47.32 | a | 47.76 | 51.17 | 52.74 | 57.12 | 61.08 | 60.00 | 58.83 | 58.79 | 49.87 | 44.39 | 52.82 | ||||||||||||
| 1989 | 44.00 | 39.93 | 47.71 | 53.72 | 54.29 | 58.85 | 60.24 | 62.05 | 59.78 | 54.89 | 50.08 | 46.06 | 52.63 | |||||||||||||
| 1990 | 46.10 | 44.11 | 49.97 | 52.45 | 53.39 | 58.05 | 62.85 | 63.65 | 62.93 | 53.87 | 49.27 | 38.73 | 52.95 | |||||||||||||
| 1991 | 43.63 | 51.95 | 45.69 | 49.23 | 51.50 | 55.42 | 61.60 | 62.44 | 61.53 | 56.11 | 51.38 | 44.16 | 52.89 | |||||||||||||
| 1992 | 46.65 | 51.55 | 52.24 | 54.50 | 57.11 | 59.60 | 62.42 | 62.40 | 59.83 | 56.18 | 49.55 | 43.21 | 54.60 | |||||||||||||
| 1993 | 41.98 | 44.62 | 52.05 | 51.12 | 56.68 | 58.10 | 59.50 | 61.90 | 58.13 | 55.85 | 44.23 | 44.37 | 52.38 | |||||||||||||
| 1994 | 47.27 | 44.55 | 49.24 | 51.00 | 55.63 | 56.92 | 60.26 | 62.34 | 61.13 | 53.94 | 43.75 | 45.89 | 52.66 | |||||||||||||
| 1995 | 48.56 | 50.93 | 48.35 | 49.85 | 54.40 | 57.53 | 63.15 | 60.79 | 61.88 | 55.10 | 53.05 | 49.21 | 54.40 | |||||||||||||
| 1996 | 46.37 | 49.60 | 49.16 | 52.05 | 52.61 | 57.52 | 61.44 | 60.95 | 58.77 | 54.66 | 49.97 | 47.08 | 53.35 | |||||||||||||
| 1997 | 45.21 | 46.75 | 48.85 | 50.75 | 58.48 | 58.38 | 61.71 | 63.69 | 62.73 | 55.47 | 50.78 | 43.48 | 53.86 | |||||||||||||
| 1998 | 48.84 | 46.82 | 48.50 | 49.08 | 53.06 | 57.02 | 62.55 | 61.77 | 59.95 | 55.18 | 49.63 | 41.87 | 52.86 | |||||||||||||
| 1999 | 44.84 | 45.34 | 45.26 | 48.63 | 50.63 | 56.77 | 58.40 | 61.79 | 57.83 | 54.48 | 51.50 | 45.13 | 51.72 | |||||||||||||
| 2000 | 44.32 | 47.48 | 45.19 | 51.60 | 54.60 | 58.58 | 60.42 | 60.66 | 60.57 | 54.81 | 46.33 | 46.10 | 52.56 | |||||||||||||
| 2001 | 45.11 | 44.61 | 48.50 | 47.68 | 53.97 | 56.07 | 59.84 | 61.73 | 59.70 | 54.10 | 50.92 | 45.47 | 52.31 | |||||||||||||
| 2002 | 44.32 | 46.68 | 44.85 | 50.27 | 51.74 | 58.12 | 62.03 | 60.45 | 60.43 | 52.34 | 51.43 | 47.76 | 52.54 | |||||||||||||
| 2003 | 50.11 | 46.32 | 50.58 | 48.73 | 54.42 | 59.23 | 62.13 | 62.02 | 60.37 | 57.92 | 46.87 | 45.71 | 53.70 | |||||||||||||
| 2004 | 46.78 | b | 46.53 | 50.95 | 51.87 | 55.71 | b | 59.03 | 63.76 | 65.27 | 60.62 | 55.39 | 47.68 | 46.47 | 54.17 | |||||||||||
| 2005 | 45.08 | 47.09 | 51.68 | 50.42 | 56.71 | 58.37 | 63.05 | 62.03 | 58.52 | 55.65 | 48.55 | 46.06 | 53.60 | |||||||||||||
| 2006 | 47.68 | 45.70 | 45.18 | 49.75 | 54.73 | 59.62 | 61.92 | 59.56 | 59.57 | 53.27 | 48.97 | 45.34 | 52.61 | |||||||||||||
| 2007 | 41.61 | 45.54 | 49.63 | 49.78 | 53.60 | 56.80 | 63.32 | 62.23 | 58.42 | 53.37 | 47.85 | 43.52 | 52.14 | |||||||||||||
| 2008 | 40.84 | 44.74 | 45.03 | 46.95 | 53.89 | 55.28 | j | 59.85 | 62.03 | 58.18 | 54.29 | 51.90 | 42.24 | 50.90 | ||||||||||||
| 2009 | 45.31 | 45.62 | 45.32 | 48.42 | 54.11 | 58.80 | 61.95 | 62.47 | 61.57 | 54.15 | 48.38 | 42.05 | 52.35 | |||||||||||||
| 2010 | 49.19 | 48.80 | 47.65 | 47.80 | 52.00 | 57.27 | 59.08 | 60.90 | 61.88 | 54.58 | 47.78 | 47.26 | 52.85 | |||||||||||||
| 2011 | 46.26 | 43.21 | 47.66 | 47.07 | 50.61 | 56.92 | 60.56 | 62.48 | 61.17 | a | 55.89 | 47.47 | 41.87 | 51.76 | ||||||||||||
| 2012 | 45.24 | 45.22 | 44.92 | 51.33 | 52.81 | 56.78 | 61.34 | 61.19 | 57.93 | 54.98 | 51.28 | 44.39 | 52.29 | |||||||||||||
| 2013 | 42.61 | 45.04 | 48.65 | a | 54.50 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 41.50 | z | 45.43 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 45.15 | 46.66 | 48.13 | 49.89 | 53.81 | 57.74 | 61.19 | 61.80 | 59.97 | 54.98 | 48.88 | 44.77 | 52.79 | |||||||||||||
| S.D. | 2.37 | 2.51 | 2.44 | 1.97 | 1.78 | 1.30 | 1.27 | 1.15 | 1.40 | 1.32 | 2.40 | 2.28 | 0.82 | |||||||||||||
| SKEW | 0.06 | 0.06 | 0.04 | -0.06 | 0.49 | -0.28 | -0.13 | 0.28 | 0.53 | 0.60 | -0.70 | -0.37 | 0.17 | |||||||||||||
| MAX | 50.11 | 51.95 | 52.24 | 54.50 | 58.48 | 60.30 | 63.76 | 65.27 | 63.25 | 58.79 | 53.05 | 49.21 | 54.60 | |||||||||||||
| MIN | 40.84 | 39.93 | 44.52 | 45.15 | 50.61 | 54.12 | 58.40 | 59.56 | 57.83 | 52.34 | 42.50 | 38.73 | 51.32 | |||||||||||||
| NO YRS | 42 | 42 | 42 | 41 | 41 | 40 | 41 | 41 | 41 | 41 | 41 | 42 | 40 | |||||||||||||