| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1983 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 57.70 | 60.73 | 61.47 | 59.20 | 54.08 | 51.63 | 43.23 | 55.43 | ||||||||
| 1984 | 46.73 | 48.45 | 50.65 | 48.58 | 53.10 | 55.60 | 58.61 | 60.92 | 59.03 | 52.98 | 49.33 | 42.23 | 52.18 | |||||||||||||
| 1985 | 43.52 | 44.09 | 44.53 | 50.05 | 52.56 | 57.20 | 60.27 | 58.95 | 56.40 | 53.39 | 42.60 | 43.19 | 50.56 | |||||||||||||
| 1986 | 48.89 | 48.46 | 51.68 | 48.80 | 52.84 | 58.43 | 58.90 | 59.35 | 57.20 | 54.98 | 51.23 | 46.79 | 53.13 | |||||||||||||
| 1987 | 45.81 | 47.82 | 49.24 | 51.40 | a | 55.21 | b | 57.22 | 58.65 | 59.71 | 58.07 | 56.82 | 51.65 | 43.63 | 52.93 | |||||||||||
| 1988 | 45.15 | 47.26 | 47.52 | 50.65 | 52.76 | 56.37 | 60.31 | 58.85 | 57.80 | 57.82 | 50.42 | 45.50 | 52.53 | |||||||||||||
| 1989 | 44.18 | 39.95 | 47.42 | 53.37 | 53.37 | 58.03 | 59.52 | 61.00 | 59.35 | 54.44 | 50.48 | 46.42 | 52.29 | |||||||||||||
| 1990 | 46.71 | 44.75 | 49.47 | 51.77 | 53.87 | 57.92 | 61.40 | 62.48 | 62.20 | 54.27 | 49.82 | 38.79 | 52.79 | |||||||||||||
| 1991 | 44.02 | 52.20 | 46.31 | 48.82 | 51.47 | 55.32 | 60.92 | 60.61 | 61.72 | 56.68 | 51.83 | 45.95 | 52.99 | |||||||||||||
| 1992 | 47.92 | 52.60 | 52.63 | 54.65 | 57.34 | 59.65 | 61.53 | 61.55 | 58.50 | 56.63 | 49.87 | 44.53 | 54.78 | |||||||||||||
| 1993 | 41.71 | 45.32 | 51.06 | 51.83 | 57.11 | 58.90 | 59.71 | 61.58 | 57.75 | 56.39 | 45.57 | 45.21 | 52.68 | |||||||||||||
| 1994 | 47.74 | 44.62 | 50.05 | 51.77 | 55.47 | 57.20 | 59.81 | 62.52 | 61.20 | 53.89 | 45.00 | 46.13 | 52.95 | |||||||||||||
| 1995 | 48.34 | 50.21 | 48.35 | 50.05 | 54.35 | 58.37 | 62.47 | 60.60 | 62.69 | i | 55.75 | i | 53.78 | 48.93 | j | 54.06 | ||||||||||
| 1996 | 46.81 | 48.14 | a | 49.07 | j | 51.53 | 52.34 | 57.40 | j | 60.40 | 60.55 | i | 58.90 | i | 55.48 | 50.50 | i | 48.84 | i | 52.45 | ||||||
| 1997 | 46.03 | 47.32 | 48.61 | 50.59 | a | 58.27 | 58.17 | i | 62.10 | 64.55 | j | 62.87 | 55.82 | 53.10 | j | 46.19 | 53.09 | |||||||||
| 1998 | 48.71 | 48.70 | a | 48.45 | i | 48.70 | 53.12 | k | 56.12 | i | ----- | z | 61.40 | k | 59.30 | 55.95 | 50.05 | i | 43.34 | i | 52.27 | |||||
| 1999 | 45.39 | i | 43.70 | f | 43.72 | b | 46.58 | 49.13 | 54.73 | 57.19 | 60.40 | 56.43 | 52.90 | 51.20 | 45.81 | 51.81 | ||||||||||
| 2000 | 44.59 | d | 47.14 | h | 45.11 | h | 51.61 | k | 53.83 | h | 57.27 | h | 60.36 | j | 60.24 | h | 61.07 | i | 54.61 | i | 47.62 | j | 47.14 | j | 44.59 | |
| 2001 | 46.30 | h | 45.25 | h | 48.27 | i | 48.31 | i | 54.09 | h | 55.93 | i | 58.47 | l | 60.78 | h | 58.32 | k | 54.11 | h | 51.80 | j | 46.02 | j | 9999.00 | |
| 2002 | 45.28 | h | 46.72 | h | 45.93 | j | 49.43 | h | 50.87 | h | 57.75 | j | 60.86 | j | 60.50 | i | 60.00 | i | 53.20 | h | 52.45 | k | 48.50 | i | 9999.00 | |
| 2003 | 50.91 | h | 46.35 | h | ----- | z | 50.24 | i | 54.55 | j | 59.38 | i | 61.11 | h | 62.17 | j | 60.69 | i | 56.74 | h | 47.25 | l | 47.05 | k | 9999.00 | |
| 2004 | 47.52 | j | 48.00 | i | 50.26 | h | 53.09 | h | 55.10 | k | 58.75 | h | 61.86 | i | 63.91 | i | 59.83 | j | 55.76 | j | 48.92 | j | 48.08 | k | 9999.00 | |
| 2005 | 46.74 | j | 50.12 | h | 50.85 | h | 51.02 | i | 56.36 | j | 57.91 | h | 62.39 | l | 60.07 | h | 57.21 | i | 56.05 | l | 49.30 | j | 46.43 | j | 9999.00 | |
| 2006 | 48.31 | j | 44.85 | h | 46.22 | h | 50.92 | k | 54.70 | i | 58.91 | h | 60.48 | j | 58.78 | h | 59.90 | j | 54.45 | j | 48.69 | i | 45.92 | k | 9999.00 | |
| 2007 | 42.69 | o | 46.20 | h | 47.66 | i | 49.67 | i | 53.36 | i | 56.34 | h | 61.48 | j | 62.41 | h | 56.79 | i | 54.13 | h | 48.80 | j | 44.25 | m | 9999.00 | |
| 2008 | 41.85 | k | 45.62 | h | 45.62 | j | 46.39 | h | 53.75 | i | 53.83 | i | 58.80 | h | 61.02 | j | 57.50 | h | 53.33 | k | 52.20 | j | 42.61 | h | 9999.00 | |
| 2009 | 45.59 | i | 46.53 | h | 45.41 | i | 48.16 | h | 52.58 | k | 57.52 | h | 60.61 | h | 61.60 | j | 61.50 | i | 54.16 | i | 50.07 | i | 41.64 | i | 9999.00 | |
| 2010 | 49.80 | k | 49.34 | i | 48.20 | h | 48.30 | h | 51.21 | j | 55.93 | h | 57.87 | h | 60.61 | i | 61.20 | h | 55.71 | j | 48.83 | i | 47.43 | h | 9999.00 | |
| 2011 | 46.02 | j | 43.78 | h | 47.48 | h | 46.28 | j | 51.05 | i | 56.43 | i | 59.85 | k | 61.52 | h | 60.93 | h | 55.28 | k | 48.20 | h | 44.09 | i | 9999.00 | |
| 2012 | 45.66 | l | 45.90 | h | 44.23 | i | 50.50 | i | 51.57 | h | 57.05 | i | 59.50 | i | 60.11 | h | 57.35 | j | 55.09 | h | 51.55 | i | 44.74 | n | 9999.00 | |
| 2013 | 44.02 | j | 45.28 | j | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 46.05 | 47.33 | 48.66 | 50.57 | 53.95 | 57.33 | 60.16 | 60.71 | 59.13 | 55.16 | 49.60 | 44.54 | 52.71 | |||||||||||||
| S.D. | 2.07 | 3.25 | 2.59 | 2.01 | 2.42 | 1.41 | 1.40 | 1.18 | 2.04 | 1.51 | 3.09 | 2.18 | 0.99 | |||||||||||||
| SKEW | -0.40 | -0.40 | -0.42 | 0.06 | 0.11 | -0.34 | -0.23 | -0.06 | 0.45 | 0.01 | -1.07 | -1.36 | -0.11 | |||||||||||||
| MAX | 48.89 | 52.60 | 52.63 | 54.65 | 58.27 | 59.65 | 62.47 | 62.52 | 62.87 | 57.82 | 53.78 | 46.79 | 54.78 | |||||||||||||
| MIN | 41.71 | 39.95 | 43.72 | 46.58 | 49.13 | 54.73 | 57.19 | 58.85 | 56.40 | 52.90 | 42.60 | 38.79 | 50.56 | |||||||||||||
| NO YRS | 16 | 15 | 14 | 16 | 15 | 14 | 16 | 14 | 15 | 16 | 14 | 14 | 11 | |||||||||||||