| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1979 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 43.18 | b | 39.90 | 41.54 | ||
| 1980 | 47.97 | 47.28 | 46.03 | a | 49.97 | 52.97 | 55.40 | 62.87 | 63.28 | b | 59.97 | 52.10 | 43.67 | 41.90 | a | 51.95 | ||||||||||
| 1981 | 45.16 | 45.11 | 47.50 | a | 53.20 | 56.77 | ----- | z | 64.80 | a | 65.61 | 61.87 | 52.55 | 45.60 | 41.61 | 52.71 | ||||||||||
| 1982 | 41.84 | 47.00 | 47.00 | 50.13 | 56.97 | 57.93 | 61.10 | 64.61 | 61.30 | 50.94 | 43.10 | ----- | z | 52.90 | ||||||||||||
| 1983 | 41.68 | 45.71 | 49.29 | 47.53 | 53.29 | 57.73 | 59.10 | 64.71 | 63.40 | 56.00 | 45.10 | 42.32 | 52.16 | |||||||||||||
| 1984 | 39.81 | 41.38 | 46.52 | 49.40 | 55.55 | 59.00 | 67.65 | 66.97 | 68.17 | 54.87 | 46.07 | 41.68 | 53.09 | |||||||||||||
| 1985 | 40.23 | 41.79 | 45.13 | 51.53 | 54.68 | 58.03 | 65.06 | 62.71 | 59.30 | 56.19 | 47.43 | 41.45 | 51.96 | |||||||||||||
| 1986 | 45.45 | ----- | z | 50.10 | 50.83 | 54.29 | 60.10 | 61.48 | 64.55 | 57.60 | 53.84 | 46.47 | 40.97 | 53.24 | ||||||||||||
| 1987 | 39.32 | 42.82 | 46.65 | 51.17 | 57.00 | 59.10 | 59.74 | 62.32 | 60.97 | 60.77 | ----- | z | 38.77 | 52.60 | ||||||||||||
| 1988 | 40.13 | 42.59 | 44.52 | 50.50 | 53.29 | 56.43 | 63.29 | 63.71 | 60.03 | 57.94 | 47.50 | 41.16 | 51.76 | |||||||||||||
| 1989 | 37.47 | a | 43.93 | 47.48 | 54.60 | 55.00 | 59.17 | 62.52 | 63.52 | 59.00 | 55.35 | 46.80 | 38.94 | 51.98 | ||||||||||||
| 1990 | 40.10 | 38.68 | 47.90 | 54.40 | 54.71 | 59.67 | 64.19 | 63.84 | 62.57 | 54.74 | 46.00 | 37.90 | 52.06 | |||||||||||||
| 1991 | 42.71 | 45.75 | 45.48 | 50.30 | 52.77 | 57.53 | 61.97 | 63.13 | ----- | z | 57.60 | a | 45.80 | 42.81 | 51.44 | |||||||||||
| 1992 | 39.94 | 48.24 | 50.29 | ----- | z | 61.48 | ----- | z | 65.03 | 67.32 | 62.17 | ----- | z | 44.07 | 39.58 | 53.12 | ||||||||||
| 1993 | 46.71 | 47.43 | 50.45 | 52.67 | 58.10 | 61.07 | 64.00 | 63.48 | 60.00 | 56.19 | 47.00 | 40.81 | 53.99 | |||||||||||||
| 1994 | 40.03 | 43.29 | ----- | z | 52.80 | 55.23 | ----- | z | 63.45 | 66.42 | ----- | z | 54.16 | 42.17 | 41.00 | 50.95 | ||||||||||
| 1995 | 46.03 | 49.00 | 48.65 | 48.20 | 52.68 | 55.80 | 60.23 | 63.42 | 62.70 | 54.06 | 48.67 | 42.81 | 52.69 | |||||||||||||
| 1996 | ----- | z | 47.17 | 47.39 | 50.33 | 56.71 | 59.43 | 63.61 | 64.81 | 62.67 | l | 52.00 | 46.23 | 42.84 | 53.05 | |||||||||||
| 1997 | 45.35 | 41.54 | 46.42 | 49.60 | 58.77 | 61.57 | 62.06 | 65.90 | j | ----- | z | 55.13 | 48.62 | i | ----- | z | 52.56 | |||||||||
| 1998 | 44.06 | 45.86 | 46.74 | ----- | z | 53.90 | 57.43 | ----- | z | ----- | z | ----- | z | ----- | z | 45.97 | ----- | z | 48.99 | |||||||
| 1999 | 41.24 | b | 41.36 | 44.11 | c | 47.08 | d | 53.23 | 55.79 | a | 61.84 | 61.17 | a | 59.59 | a | 53.31 | e | 45.88 | d | 38.85 | d | 50.29 | ||||
| 2000 | 43.13 | a | 46.30 | b | 46.27 | a | 51.26 | c | 56.55 | 60.30 | 61.00 | c | 63.31 | b | 61.10 | 55.73 | a | 41.21 | b | 42.04 | c | 52.35 | ||||
| 2001 | 38.81 | d | 41.85 | a | 49.76 | b | 48.59 | c | 56.90 | 58.69 | a | 62.06 | 63.21 | c | 60.67 | 56.88 | g | 49.10 | 37.00 | h | 52.97 | |||||
| 2002 | 40.32 | 41.11 | 44.74 | 51.37 | 54.13 | 57.78 | c | 61.77 | 62.00 | j | 61.33 | 54.68 | 49.23 | ----- | z | 51.65 | ||||||||||
| 2003 | 45.00 | 45.79 | i | 47.65 | 48.60 | 54.06 | 58.76 | e | 63.35 | 65.65 | 62.60 | 58.88 | g | 47.20 | 41.35 | e | 53.42 | |||||||||
| 2004 | 43.73 | e | 42.17 | 50.56 | f | 53.59 | h | 56.76 | n | 58.88 | e | 63.32 | 63.42 | 62.78 | l | 55.13 | h | 44.76 | e | 43.68 | 51.42 | |||||
| 2005 | 45.39 | 46.89 | 49.77 | 48.07 | 55.65 | 58.00 | 62.16 | ----- | z | ----- | z | ----- | z | ----- | z | 44.71 | 51.33 | |||||||||
| 2006 | 42.10 | ----- | z | ----- | z | 49.43 | 55.81 | 60.60 | 67.58 | 64.29 | 58.93 | ----- | z | 49.13 | ----- | z | 55.98 | |||||||||
| 2007 | 37.97 | 45.00 | ----- | z | 51.57 | ----- | z | 57.63 | ----- | z | ----- | z | ----- | z | ----- | z | 50.73 | 40.19 | 47.18 | |||||||
| 2008 | 42.87 | a | 42.23 | c | ----- | z | 51.10 | 54.42 | 63.79 | a | 58.96 | c | 65.40 | a | 62.96 | b | 54.31 | e | 50.83 | 43.48 | 53.67 | |||||
| 2009 | 43.39 | 42.21 | 46.27 | a | 48.60 | e | 57.67 | a | 58.87 | ----- | z | 63.03 | 63.07 | 53.71 | 45.57 | 41.77 | 51.29 | |||||||||
| 2010 | 42.39 | 44.43 | 47.39 | 49.13 | 53.10 | 58.13 | 61.35 | 62.03 | 59.07 | 56.81 | 45.80 | 43.97 | 51.97 | |||||||||||||
| 2011 | 40.77 | 42.18 | 46.55 | 51.00 | d | 53.42 | 57.17 | 63.42 | 63.48 | 61.50 | 53.27 | a | 45.68 | b | 37.90 | 51.36 | ||||||||||
| 2012 | 41.16 | 43.83 | 46.19 | 49.57 | 55.26 | 56.33 | 61.23 | 66.81 | 65.03 | 56.32 | 48.50 | 45.23 | 52.95 | |||||||||||||
| 2013 | 39.00 | 41.50 | 49.55 | 55.00 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 34.00 | z | 43.35 | ||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 42.16 | 44.05 | 47.30 | 50.42 | 55.30 | 58.54 | 62.67 | 64.15 | 61.40 | 54.90 | 46.27 | 41.41 | 52.18 | |||||||||||||
| S.D. | 2.69 | 2.58 | 1.80 | 1.88 | 2.04 | 1.84 | 2.09 | 1.53 | 2.23 | 2.13 | 2.31 | 1.94 | 0.86 | |||||||||||||
| SKEW | 0.29 | 0.14 | 0.22 | 0.41 | 0.93 | 0.64 | 0.51 | 0.38 | 0.99 | 0.58 | -0.02 | -0.06 | -0.11 | |||||||||||||
| MAX | 47.97 | 49.00 | 50.45 | 54.60 | 61.48 | 63.79 | 67.65 | 67.32 | 68.17 | 60.77 | 50.83 | 45.23 | 53.99 | |||||||||||||
| MIN | 37.47 | 38.68 | 44.11 | 47.08 | 52.68 | 55.40 | 58.96 | 61.17 | 57.60 | 50.94 | 41.21 | 37.90 | 50.29 | |||||||||||||
| NO YRS | 33 | 31 | 29 | 30 | 31 | 30 | 30 | 28 | 25 | 25 | 31 | 28 | 14 | |||||||||||||