| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1983 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 50.37 | 53.58 | 52.42 | 48.63 | 44.13 | 45.33 | 37.61 | 47.44 | ||||||||
| 1984 | 39.16 | 40.72 | 43.55 | 41.50 | 45.16 | 48.17 | 49.48 | 52.58 | 48.70 | 45.39 | 42.80 | 35.52 | 44.39 | |||||||||||||
| 1985 | 35.52 | 35.57 | 36.42 | 42.77 | 43.74 | 48.13 | 51.45 | 50.81 | 47.33 | 43.35 | 36.07 | 34.19 | 42.11 | |||||||||||||
| 1986 | 41.84 | 42.64 | 43.52 | 40.60 | 45.26 | 50.73 | 50.65 | 51.90 | 49.10 | 47.58 | 44.23 | 39.61 | 45.64 | |||||||||||||
| 1987 | 38.68 | 39.50 | 41.29 | 41.80 | 47.74 | 48.87 | 51.71 | 50.42 | 48.57 | 46.29 | 45.03 | 37.77 | 44.81 | |||||||||||||
| 1988 | 38.81 | 39.41 | 39.03 | 43.63 | 45.06 | 48.63 | 50.90 | 49.10 | 46.17 | 50.35 | 44.43 | 38.35 | 44.49 | |||||||||||||
| 1989 | 38.03 | 32.79 | 41.10 | 45.13 | 45.71 | 50.20 | 51.74 | 53.06 | 47.30 | 44.84 | 42.50 | 39.16 | 44.30 | |||||||||||||
| 1990 | 40.42 | 37.29 | 42.29 | 44.33 | 46.13 | 51.07 | 52.55 | 54.42 | 53.40 | 45.16 | 42.87 | 31.65 | 45.13 | |||||||||||||
| 1991 | 35.84 | 44.54 | 38.32 | 42.10 | 45.23 | 48.23 | 51.61 | 53.10 | 50.37 | 45.55 | 45.43 | 39.77 | 45.01 | |||||||||||||
| 1992 | 41.23 | 44.93 | 44.23 | 46.87 | 47.35 | 51.87 | 53.52 | 52.06 | 48.77 | 47.61 | 43.53 | 38.52 | 46.71 | |||||||||||||
| 1993 | 35.39 | 37.39 | 44.84 | 45.10 | 50.10 | 51.60 | 51.84 | 52.77 | 48.00 | 48.32 | 36.73 | 39.00 | 45.09 | |||||||||||||
| 1994 | 40.29 | 37.04 | 41.03 | 44.90 | 47.90 | 50.00 | 51.19 | 53.45 | 52.37 | 43.97 | 37.87 | 39.84 | 44.99 | |||||||||||||
| 1995 | 43.03 | 42.96 | 40.10 | 42.03 | 47.26 | 50.27 | 54.45 | 50.97 | 53.14 | i | 45.50 | i | 47.37 | 42.90 | j | 46.49 | ||||||||||
| 1996 | 40.35 | 40.66 | 40.14 | j | 43.20 | 44.00 | 48.55 | j | 50.74 | 51.05 | i | 48.38 | i | 46.61 | 42.67 | i | 43.09 | i | 44.26 | |||||||
| 1997 | 39.13 | 39.79 | 40.90 | 42.41 | a | 49.77 | 49.81 | i | 52.71 | 55.24 | j | 54.13 | 47.97 | 47.60 | j | 39.29 | 45.12 | |||||||||
| 1998 | 43.61 | 42.64 | 40.18 | i | 40.40 | 46.65 | k | 49.14 | i | ----- | z | 50.90 | k | 48.70 | 47.10 | 43.29 | i | 36.59 | i | 44.49 | ||||||
| 1999 | 38.86 | i | 36.68 | f | 34.55 | b | 36.20 | 39.68 | 45.60 | 47.94 | 52.45 | 44.00 | 41.23 | 44.10 | 38.26 | 42.40 | ||||||||||
| 2000 | 37.37 | d | 40.67 | h | 35.00 | h | 41.95 | j | 46.00 | h | 49.55 | h | 52.10 | j | 50.91 | h | 50.24 | i | 45.18 | i | 39.95 | j | 39.48 | j | 37.37 | |
| 2001 | 38.78 | h | 36.35 | h | 39.82 | i | 40.38 | i | 43.57 | h | 47.24 | i | 49.37 | l | 53.48 | h | 48.00 | j | 42.48 | h | 43.50 | j | 39.48 | j | 9999.00 | |
| 2002 | 38.52 | h | 36.80 | h | 36.48 | j | 40.41 | h | 41.87 | h | 47.85 | j | 51.19 | j | 48.27 | i | 48.24 | i | 42.78 | h | 43.79 | k | 41.23 | i | 9999.00 | |
| 2003 | 43.00 | h | 36.70 | h | ----- | z | 42.52 | i | 44.14 | j | 48.52 | i | 50.39 | h | 51.86 | j | 49.00 | i | 46.83 | h | 40.56 | l | 39.95 | k | 9999.00 | |
| 2004 | 41.38 | j | 39.50 | i | 40.04 | h | 42.32 | h | 47.25 | k | 50.82 | h | 51.82 | i | 55.09 | i | 50.30 | j | 47.24 | j | 40.70 | j | 41.40 | k | 9999.00 | |
| 2005 | 39.33 | j | 39.10 | h | 41.83 | h | 42.86 | i | 48.33 | j | 50.05 | h | 52.37 | l | 49.70 | h | 45.14 | i | 48.05 | l | 41.10 | j | 38.67 | j | 9999.00 | |
| 2006 | 41.52 | j | 34.70 | h | 38.57 | h | 42.11 | k | 43.45 | i | 50.68 | h | 50.48 | j | 49.17 | h | 48.10 | j | 42.52 | j | 41.24 | i | 37.20 | k | 9999.00 | |
| 2007 | 34.94 | n | 38.95 | h | 38.59 | i | 40.10 | i | 43.91 | i | 47.45 | h | 52.76 | j | 52.83 | h | 45.52 | i | 44.65 | h | 39.55 | j | 37.28 | m | 9999.00 | |
| 2008 | 34.35 | k | 37.57 | h | 37.14 | j | 37.27 | h | 45.09 | i | 45.14 | i | 49.39 | h | 53.00 | j | 45.82 | h | 44.00 | j | 45.65 | j | 34.78 | h | 9999.00 | |
| 2009 | 36.50 | i | 37.95 | h | 37.09 | i | 38.95 | h | 42.85 | k | 49.86 | h | 51.00 | h | 52.38 | j | 50.24 | i | 44.64 | i | 41.43 | i | 33.50 | i | 9999.00 | |
| 2010 | 43.45 | k | 41.95 | i | 39.22 | h | 39.68 | h | 43.14 | j | 48.36 | h | 49.13 | h | 51.45 | i | 52.27 | h | 44.90 | j | 41.95 | i | 40.96 | h | 9999.00 | |
| 2011 | 38.00 | j | 35.00 | h | 40.57 | h | 37.40 | j | 42.55 | i | 48.14 | i | 50.90 | k | 51.09 | h | 49.36 | h | 45.85 | k | 40.32 | h | 35.27 | i | 9999.00 | |
| 2012 | 36.68 | l | 37.76 | h | 35.82 | i | 43.10 | i | 42.00 | h | 48.81 | i | 51.50 | i | 50.17 | h | 46.70 | j | 45.87 | h | 44.52 | i | 37.65 | n | 9999.00 | |
| 2013 | 36.57 | j | 37.83 | j | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 39.29 | 39.86 | 40.80 | 42.69 | 46.01 | 49.55 | 51.63 | 52.11 | 49.04 | 45.97 | 42.74 | 37.75 | 44.79 | |||||||||||||
| S.D. | 2.50 | 3.42 | 2.96 | 2.49 | 2.58 | 1.70 | 1.60 | 1.38 | 2.66 | 2.24 | 3.43 | 2.39 | 1.11 | |||||||||||||
| SKEW | -0.02 | -0.33 | -0.61 | -0.80 | -0.59 | -0.72 | -0.41 | -0.58 | 0.36 | -0.15 | -0.93 | -1.48 | -0.89 | |||||||||||||
| MAX | 43.61 | 44.93 | 44.84 | 46.87 | 50.10 | 51.87 | 54.45 | 54.42 | 54.13 | 50.35 | 47.37 | 39.84 | 46.71 | |||||||||||||
| MIN | 35.39 | 32.79 | 34.55 | 36.20 | 39.68 | 45.60 | 47.94 | 49.10 | 44.00 | 41.23 | 36.07 | 31.65 | 42.11 | |||||||||||||
| NO YRS | 16 | 15 | 14 | 16 | 15 | 14 | 16 | 14 | 15 | 16 | 14 | 14 | 11 | |||||||||||||