| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1973 | ----- | z | ----- | z | 43.97 | 49.35 | 55.32 | 59.50 | 64.08 | 60.97 | 59.95 | 51.16 | 43.70 | 44.24 | 53.22 | |||||||||||
| 1974 | 36.03 | 40.30 | 45.06 | 48.20 | 52.05 | 59.27 | 63.02 | 64.34 | 62.88 | 51.84 | 45.98 | 42.48 | 50.95 | |||||||||||||
| 1975 | 42.97 | 41.77 | 42.56 | 44.00 | 53.08 | 57.75 | 64.21 | 60.63 | 60.87 | 52.31 | 43.77 | 42.37 | 50.52 | |||||||||||||
| 1976 | 40.50 | 40.45 | 42.66 | 47.32 | 54.47 | 56.48 | 63.32 | 63.08 | 60.98 | b | 52.32 | 46.00 | 37.29 | 50.41 | ||||||||||||
| 1977 | 37.60 | 43.93 | 42.81 | 50.88 | b | 50.61 | 60.40 | 62.31 | 68.27 | 58.20 | 52.60 | 44.38 | 43.13 | 51.26 | ||||||||||||
| 1978 | 41.82 | 45.32 | 48.42 | 48.28 | 52.85 | 61.97 | 64.66 | 64.02 | 58.22 | 53.24 | 40.17 | ----- | z | 52.63 | ||||||||||||
| 1979 | 30.19 | 41.68 | 47.37 | 49.28 | 55.56 | 61.07 | 65.79 | 63.89 | 62.19 | a | 55.87 | 42.87 | 43.39 | 51.60 | ||||||||||||
| 1980 | 36.80 | a | 43.84 | 44.61 | 51.43 | 53.48 | 57.28 | 64.63 | 61.15 | 59.88 | 53.31 | 46.93 | 42.69 | 51.34 | ||||||||||||
| 1981 | 40.85 | 42.57 | 46.19 | 50.45 | 54.65 | a | 58.67 | 63.66 | 67.65 | 61.67 | 50.77 | 46.42 | 42.35 | 52.16 | ||||||||||||
| 1982 | 37.39 | 41.71 | 44.47 | 46.15 | 53.63 | 61.13 | 62.95 | 64.52 | 59.10 | 52.35 | 41.55 | 40.16 | 50.43 | |||||||||||||
| 1983 | 42.68 | 45.93 | 48.58 | 48.83 | 56.24 | 57.85 | 61.69 | 64.71 | 57.57 | 51.35 | 47.63 | 35.58 | a | 51.55 | ||||||||||||
| 1984 | ----- | z | 44.34 | 48.66 | 47.68 | 53.23 | 57.58 | 64.29 | 64.18 | 59.87 | 49.02 | 44.45 | ----- | z | 53.33 | |||||||||||
| 1985 | 34.10 | 39.00 | 43.24 | 51.48 | 54.68 | 61.08 | 68.15 | 64.60 | 56.83 | 50.90 | a | 36.27 | 33.79 | 49.51 | ||||||||||||
| 1986 | 43.22 | a | 42.91 | 50.56 | 47.93 | 55.16 | 62.68 | 61.58 | 67.89 | 57.93 | 53.50 | 45.75 | ----- | z | 53.56 | |||||||||||
| 1987 | 39.31 | 43.62 | 47.27 | 52.30 | 57.15 | 63.22 | 62.56 | 65.00 | 61.33 | 55.39 | 45.28 | a | 37.90 | a | 52.53 | |||||||||||
| 1988 | 38.32 | 42.25 | a | 45.58 | 50.58 | 54.42 | 59.05 | 65.00 | 63.76 | 60.67 | 55.26 | 45.50 | 39.05 | 51.62 | ||||||||||||
| 1989 | 40.55 | 34.79 | 44.21 | 53.67 | 55.18 | 61.00 | 62.58 | 62.79 | 61.32 | 51.55 | 45.20 | 38.03 | 50.90 | |||||||||||||
| 1990 | 41.19 | 39.75 | 47.73 | 51.82 | 53.56 | 60.23 | 66.98 | 66.10 | 63.18 | 50.02 | 45.87 | 33.11 | 51.63 | |||||||||||||
| 1991 | 37.69 | 47.05 | 42.94 | 47.97 | 51.34 | 55.98 | 65.48 | 65.85 | 62.85 | 53.60 | 46.53 | ----- | z | 52.48 | ||||||||||||
| 1992 | 42.79 | 47.10 | 49.74 | 52.82 | 58.55 | 63.38 | 65.53 | 65.87 | 60.03 | 54.06 | 44.27 | 38.29 | 53.54 | |||||||||||||
| 1993 | 34.74 | 37.95 | 47.60 | 48.92 | 57.06 | 58.67 | 60.87 | 64.21 | 61.60 | 55.10 | 38.03 | 37.89 | 50.22 | |||||||||||||
| 1994 | 41.74 | 40.20 | 47.71 | 50.47 | 56.00 | 58.17 | 66.37 | 64.52 | 63.63 | 50.45 | 39.18 | 40.82 | 51.60 | |||||||||||||
| 1995 | 42.31 | 45.07 | 45.71 | 47.92 | 56.31 | 59.72 | 66.37 | 62.90 | 63.17 | 51.08 | 49.09 | a | 41.13 | 52.56 | ||||||||||||
| 1996 | 41.34 | 41.10 | 45.82 | 51.00 | 52.37 | 59.32 | 68.11 | 65.55 | 58.30 | 51.47 | 44.68 | 41.73 | 51.73 | |||||||||||||
| 1997 | 40.58 | 41.71 | 45.05 | 47.88 | 58.97 | 58.98 | 64.60 | 67.23 | 61.92 | 50.95 | 47.37 | 38.26 | 51.96 | |||||||||||||
| 1998 | 44.56 | 45.50 | 46.42 | 48.88 | 53.44 | 59.78 | 67.66 | 65.81 | 63.03 | 51.48 | 46.57 | 39.24 | 52.70 | |||||||||||||
| 1999 | 40.79 | 42.39 | 43.27 | 47.63 | 51.11 | 58.13 | 63.02 | a | 66.65 | 60.62 | 52.80 | a | 48.05 | a | 41.05 | 51.29 | ||||||||||
| 2000 | 38.87 | 43.43 | a | 43.48 | 50.67 | 54.57 | c | 61.03 | 64.06 | 63.94 | 60.45 | 52.29 | 40.67 | 40.13 | 51.13 | |||||||||||
| 2001 | 39.11 | 40.77 | 45.82 | 46.75 | 55.40 | 56.57 | 63.92 | 65.08 | 60.92 | 51.44 | 47.18 | 40.27 | 51.10 | |||||||||||||
| 2002 | 40.24 | 42.34 | 42.50 | 49.42 | 52.44 | 60.35 | 66.08 | 64.06 | 61.00 | 50.42 | 45.35 | 42.63 | 51.40 | |||||||||||||
| 2003 | 44.35 | 42.16 | 47.08 | 47.50 | 53.53 | 62.20 | 68.08 | 65.98 | 62.23 | 55.61 | 41.72 | 41.68 | 52.68 | |||||||||||||
| 2004 | 39.71 | 43.17 | 48.15 | 51.40 | 55.68 | 60.70 | 67.85 | 67.29 | 59.00 | 53.26 | 42.63 | 40.61 | 52.45 | |||||||||||||
| 2005 | 40.89 | 40.27 | 47.90 | 48.82 | 56.63 | 57.37 | 66.18 | 66.18 | 57.92 | 52.92 | 41.27 | 37.35 | 51.14 | |||||||||||||
| 2006 | 42.89 | 38.91 | 43.15 | 49.23 | 55.15 | 61.50 | 66.79 | 63.27 | 60.00 | 49.39 | 43.76 | a | 38.48 | b | 51.04 | |||||||||||
| 2007 | 35.15 | 42.12 | 48.91 | b | 49.10 | 54.47 | 58.80 | 67.39 | 64.74 | 59.07 | 49.61 | 41.58 | 39.55 | 50.87 | ||||||||||||
| 2008 | 35.97 | 42.21 | 42.06 | 45.18 | 54.61 | 56.68 | 65.05 | 65.65 | 59.77 | 50.29 | 46.35 | 37.34 | 50.10 | |||||||||||||
| 2009 | 38.18 | 40.59 | 42.45 | 47.85 | 55.02 | a | 61.70 | 67.89 | 65.45 | 61.92 | 50.69 | 44.75 | 34.84 | 50.94 | ||||||||||||
| 2010 | 45.11 | 44.48 | 45.39 | 47.80 | 52.00 | 57.30 | 64.10 | 63.39 | 60.05 | 51.79 | 44.23 | 42.63 | 51.52 | |||||||||||||
| 2011 | 40.76 | 39.00 | 44.92 | a | 44.93 | a | 50.14 | b | 57.32 | 61.71 | 64.95 | 63.52 | b | 52.32 | c | 43.00 | 35.74 | d | 49.86 | |||||||
| 2012 | 39.48 | 41.45 | a | 42.27 | a | 49.17 | a | 52.65 | d | 57.34 | a | 63.37 | a | 65.62 | a | 60.52 | b | 53.18 | a | 46.62 | 41.43 | a | 51.09 | |||
| 2013 | 35.44 | 41.34 | 45.85 | a | 55.50 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 40.87 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 39.65 | 42.11 | 45.56 | 49.02 | 54.32 | 59.43 | 64.80 | 64.79 | 60.60 | 52.17 | 44.26 | 39.63 | 51.35 | |||||||||||||
| S.D. | 3.22 | 2.50 | 2.34 | 2.13 | 2.02 | 1.99 | 2.06 | 1.76 | 1.79 | 1.74 | 2.82 | 2.82 | 0.87 | |||||||||||||
| SKEW | -0.67 | -0.27 | 0.21 | -0.08 | 0.08 | 0.15 | 0.08 | -0.28 | -0.15 | 0.42 | -0.85 | -0.51 | 0.20 | |||||||||||||
| MAX | 45.11 | 47.10 | 50.56 | 53.67 | 58.97 | 63.38 | 68.15 | 68.27 | 63.63 | 55.87 | 49.09 | 44.24 | 53.54 | |||||||||||||
| MIN | 30.19 | 34.79 | 42.06 | 44.00 | 50.14 | 55.98 | 60.87 | 60.63 | 56.83 | 49.02 | 36.27 | 33.11 | 49.51 | |||||||||||||
| NO YRS | 39 | 40 | 41 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 36 | 35 | |||||||||||||