| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1978 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 70.05 | j | 45.62 | a | 39.15 | d | 42.38 | |
| 1979 | 30.79 | g | 47.04 | e | 59.97 | 61.63 | 73.60 | a | 83.47 | 91.42 | 87.70 | a | 85.87 | 68.26 | 47.90 | 52.69 | r | 70.69 | ||||||||
| 1980 | 42.70 | k | 51.38 | h | 54.03 | b | 68.03 | 71.00 | 74.73 | 88.97 | 84.90 | 81.57 | 69.19 | 54.83 | a | 47.94 | o | 71.92 | ||||||||
| 1981 | 47.67 | a | 51.91 | f | 58.00 | d | 64.75 | b | 68.73 | a | 79.03 | a | 88.23 | 94.10 | 81.60 | 64.26 | 56.81 | i | 46.27 | i | 71.82 | |||||
| 1982 | 43.06 | 48.82 | 55.00 | 60.93 | 71.16 | 80.87 | 86.00 | 89.52 | 76.63 | 62.48 | 49.60 | 42.48 | 63.88 | |||||||||||||
| 1983 | 50.58 | 52.79 | 56.39 | 61.33 | 74.48 | 78.60 | 86.68 | 92.26 | 78.63 | 68.94 | 53.72 | l | 38.31 | o | 70.07 | |||||||||||
| 1984 | 44.06 | o | 50.26 | j | 57.42 | 59.10 | 70.16 | 77.30 | 93.48 | 93.16 | 77.03 | 60.87 | 50.07 | p | 37.91 | t | 73.57 | |||||||||
| 1985 | 39.06 | n | 48.27 | m | 54.06 | o | 69.23 | 75.03 | 86.17 | 98.58 | 88.48 | 72.87 | 66.19 | 35.23 | q | 35.18 | t | 79.51 | ||||||||
| 1986 | 51.00 | o | 52.29 | n | 63.50 | c | 65.07 | 75.52 | 89.56 | e | 88.58 | 96.74 | 73.27 | 70.61 | 52.63 | k | 43.45 | k | 77.86 | |||||||
| 1987 | 42.20 | k | 52.11 | 59.39 | m | 72.79 | a | 76.48 | 86.87 | 85.52 | 88.87 | 87.03 | 76.06 | 56.06 | n | 43.55 | 74.36 | |||||||||
| 1988 | 40.77 | 55.28 | 58.94 | 66.10 | 73.42 | 82.69 | a | 93.19 | 90.77 | 82.13 | 78.87 | 52.30 | 44.10 | 68.21 | ||||||||||||
| 1989 | 43.87 | 38.68 | 55.10 | 66.80 | 69.10 | 84.60 | 91.52 | 85.52 | 81.77 | 66.55 | 56.27 | d | 48.77 | i | 67.25 | |||||||||||
| 1990 | 47.97 | 50.14 | 60.03 | 72.60 | 70.23 | 81.17 | 94.55 | 89.48 | 87.67 | 67.61 | 54.60 | 37.90 | 67.83 | |||||||||||||
| 1991 | 43.16 | 59.18 | 53.81 | 61.03 | 65.48 | 74.43 | 90.97 | ----- | z | 86.00 | 71.10 | 52.43 | 49.06 | 64.24 | ||||||||||||
| 1992 | ----- | z | 57.61 | a | 63.48 | ----- | z | 82.48 | 87.63 | 87.03 | 92.52 | 81.90 | 71.68 | 50.43 | 41.52 | 71.63 | ||||||||||
| 1993 | 38.29 | j | 38.93 | m | 59.13 | 60.63 | 78.06 | 77.97 | 79.06 | 86.68 | 83.97 | 70.39 | c | 48.80 | 48.47 | p | 71.63 | |||||||||
| 1994 | 51.88 | n | 48.38 | g | 63.68 | 66.23 | d | 73.77 | 81.00 | 95.97 | 93.55 | 87.40 | 67.74 | 48.73 | 48.64 | q | 75.34 | |||||||||
| 1995 | 49.79 | l | 58.35 | k | 57.42 | 61.23 | 71.90 | ----- | z | 90.48 | 88.77 | 86.83 | 67.74 | 55.47 | 52.09 | t | 72.48 | |||||||||
| 1996 | 47.89 | m | 50.41 | 58.87 | 65.07 | 69.90 | 81.80 | 95.81 | 94.06 | 80.20 | 68.65 | 56.70 | 49.03 | 70.05 | ||||||||||||
| 1997 | 45.26 | 50.61 | 59.19 | 62.27 | 78.42 | 80.00 | 91.48 | 91.77 | 82.07 | 68.06 | 55.83 | 48.05 | k | 69.54 | ||||||||||||
| 1998 | 50.00 | m | 52.84 | i | 57.87 | 63.50 | 66.32 | 78.43 | 96.32 | 94.71 | 86.37 | 66.68 | 53.70 | 47.29 | j | 73.77 | ||||||||||
| 1999 | 50.55 | k | 50.00 | j | 56.42 | 61.40 | 69.52 | ----- | z | 91.77 | 91.19 | 82.77 | 72.94 | 60.77 | 45.32 | 70.23 | ||||||||||
| 2000 | 46.50 | k | 53.21 | 57.00 | a | 70.30 | 73.81 | 85.07 | 91.26 | 93.32 | 79.40 | 66.10 | b | 45.50 | b | 43.69 | e | 68.97 | ||||||||
| 2001 | 44.87 | a | 50.46 | 60.16 | 59.28 | a | 80.26 | 80.00 | 90.35 | 94.32 | 85.43 | 68.90 | 56.27 | 45.75 | k | 70.03 | ||||||||||
| 2002 | 47.63 | l | 54.86 | 54.10 | 66.13 | 73.13 | 85.47 | 97.84 | 88.06 | 83.50 | 65.42 | 56.93 | 48.00 | j | 72.54 | |||||||||||
| 2003 | 50.45 | k | 49.68 | i | 59.32 | ----- | z | 71.94 | 86.13 | 97.71 | 93.94 | 85.07 | 72.48 | ----- | z | 48.06 | m | 80.94 | ||||||||
| 2004 | 44.40 | k | 50.94 | k | 64.06 | 66.93 | 70.84 | 82.57 | 93.97 | 91.42 | 78.13 | 66.68 | 52.00 | 47.68 | 71.43 | |||||||||||
| 2005 | 44.65 | 51.11 | 59.58 | 61.80 | 71.71 | 77.43 | 94.48 | 94.32 | 79.70 | 67.29 | 49.70 | 43.45 | 66.27 | |||||||||||||
| 2006 | 49.74 | 48.25 | 52.39 | 62.60 | 74.35 | 81.90 | 98.23 | e | 89.87 | 82.37 | 65.85 | e | 53.77 | 46.68 | 67.17 | |||||||||||
| 2007 | 43.28 | f | 49.43 | 59.81 | e | 62.24 | i | 78.14 | j | 82.91 | g | 96.68 | 91.12 | e | 80.76 | e | 65.36 | f | 54.88 | f | 44.35 | e | 70.36 | |||
| 2008 | 41.44 | f | 53.17 | f | 53.58 | 59.60 | e | 72.36 | f | 78.40 | j | 93.30 | k | 90.90 | k | 82.92 | e | 71.83 | m | 57.74 | g | 41.90 | 59.50 | |||
| 2009 | 43.32 | c | 49.96 | 50.76 | b | 62.07 | 74.50 | e | 81.20 | 94.43 | c | 92.56 | f | 86.43 | g | 62.61 | h | 54.33 | i | 42.29 | n | 65.18 | ||||
| 2010 | 49.36 | i | 52.71 | g | 58.56 | f | 60.33 | 65.31 | e | 76.60 | e | 90.48 | 89.10 | 79.53 | 69.74 | h | 51.38 | i | 46.50 | k | 76.89 | |||||
| 2011 | 46.64 | c | 47.56 | c | 53.84 | 58.30 | g | 65.59 | i | 77.00 | e | 87.36 | i | 93.27 | a | 86.59 | c | 66.96 | d | 53.38 | f | 45.89 | m | 67.41 | ||
| 2012 | 50.14 | b | 50.48 | f | 57.18 | i | 67.25 | b | 73.14 | c | 77.54 | b | 92.82 | c | 95.89 | c | 87.36 | e | 68.62 | j | 54.76 | m | 47.20 | k | 77.73 | |
| 2013 | 43.73 | i | 50.25 | d | 58.67 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 50.25 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 45.84 | 50.89 | 57.76 | 64.20 | 72.70 | 81.24 | 92.00 | 91.27 | 82.25 | 68.43 | 52.64 | 43.99 | 66.67 | |||||||||||||
| S.D. | 3.01 | 4.29 | 3.45 | 3.84 | 3.97 | 3.93 | 4.36 | 3.03 | 3.95 | 3.70 | 3.98 | 3.25 | 1.73 | |||||||||||||
| SKEW | 0.19 | -0.62 | 0.05 | 0.68 | 0.30 | 0.24 | -0.70 | -0.28 | -0.57 | 0.72 | -0.11 | -0.08 | -0.92 | |||||||||||||
| MAX | 50.58 | 59.18 | 64.06 | 72.79 | 82.48 | 89.56 | 98.58 | 96.74 | 87.67 | 78.87 | 60.77 | 49.06 | 68.21 | |||||||||||||
| MIN | 40.77 | 38.68 | 50.76 | 59.10 | 65.31 | 74.43 | 79.06 | 84.90 | 72.87 | 60.87 | 45.50 | 37.90 | 63.88 | |||||||||||||
| NO YRS | 14 | 20 | 30 | 30 | 31 | 30 | 32 | 31 | 33 | 29 | 22 | 15 | 5 | |||||||||||||