| 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 | 52.62 | k | 35.93 | b | 30.58 | f | 35.93 | |
| 1979 | 21.92 | m | 37.25 | h | 47.37 | 49.57 | 58.37 | a | 65.87 | 72.66 | 70.57 | a | 66.73 | 55.95 | 38.37 | 42.05 | u | 58.38 | ||||||||
| 1980 | 32.06 | n | 41.95 | i | 43.33 | b | 53.20 | 57.27 | 61.38 | 71.52 | 67.02 | 64.58 | 54.13 | 44.19 | a | 39.22 | o | 57.40 | ||||||||
| 1981 | 38.73 | a | 41.75 | h | 45.65 | d | 51.90 | d | 55.77 | a | 62.74 | a | 68.90 | 73.34 | 64.18 | 51.15 | 45.67 | j | 38.11 | i | 56.93 | |||||
| 1982 | 34.27 | 38.75 | 43.26 | 46.78 | 55.39 | 66.42 | 69.58 | 71.06 | 61.05 | 51.00 | 39.82 | 35.85 | 51.10 | |||||||||||||
| 1983 | 41.69 | 43.50 | 46.73 | 48.08 | 59.06 | 63.15 | 69.50 | 74.31 | 60.93 | 54.77 | 45.23 | o | 32.07 | q | 56.17 | |||||||||||
| 1984 | 34.34 | o | 40.40 | n | 46.56 | 47.03 | 56.03 | 61.70 | 72.97 | 72.85 | 60.93 | 48.76 | 41.39 | p | 28.73 | t | 58.36 | |||||||||
| 1985 | 29.97 | o | 36.50 | m | 41.73 | p | 53.55 | 58.44 | 66.40 | 76.53 | 68.76 | 56.83 | 51.44 | 25.38 | r | 26.05 | t | 61.71 | ||||||||
| 1986 | 39.83 | p | 41.39 | n | 49.78 | d | 48.87 | 58.56 | 69.83 | f | 68.98 | 76.18 | 58.37 | 54.82 | 43.00 | m | 34.50 | n | 59.37 | |||||||
| 1987 | 30.50 | m | 40.53 | k | 47.12 | o | 56.26 | a | 61.23 | 68.26 | a | 69.60 | 69.29 | 67.37 | 57.06 | 44.93 | o | 34.05 | a | 60.39 | ||||||
| 1988 | 33.18 | a | 41.59 | 44.45 | 52.83 | 58.24 | 66.62 | a | 73.21 | 70.58 | 63.60 | 61.44 | 43.18 | 33.90 | 53.57 | |||||||||||
| 1989 | 35.53 | 27.57 | 44.48 | 53.13 | 55.52 | 66.95 | 71.79 | 68.61 | 62.85 | 52.16 | 44.10 | d | 35.98 | i | 52.97 | |||||||||||
| 1990 | 38.79 | 37.64 | 45.76 | 56.32 | 56.08 | 65.63 | 75.39 | 72.81 | 68.07 | 52.87 | 43.63 | 27.29 | 53.36 | |||||||||||||
| 1991 | 31.82 | 45.89 | 42.89 | 48.72 | 53.03 | 60.72 | 72.08 | ----- | z | 66.37 | 53.81 | 43.18 | 38.24 | 50.61 | ||||||||||||
| 1992 | ----- | z | 45.45 | a | 48.82 | ----- | z | 63.35 | 69.18 | 70.21 | 72.24 | 63.40 | 54.98 | a | 39.95 | 32.26 | 55.99 | |||||||||
| 1993 | 29.26 | l | 28.87 | m | 46.21 | 47.97 | 62.61 | 62.80 | 63.31 | 68.11 | 63.18 | 54.70 | c | 34.15 | 38.57 | p | 55.89 | |||||||||
| 1994 | 39.81 | o | 36.55 | g | 46.48 | 52.38 | d | 58.44 | 63.80 | 74.32 | 71.15 | 67.62 | 51.11 | 38.47 | 36.42 | r | 58.20 | |||||||||
| 1995 | 37.18 | n | 44.11 | n | 44.48 | 47.93 | 57.11 | ----- | z | 71.74 | 68.05 | 66.90 | 51.15 | 44.67 | 43.68 | t | 56.50 | |||||||||
| 1996 | 38.08 | m | 38.21 | 45.47 | 50.78 | 54.39 | 63.23 | 74.45 | a | 73.00 | 60.62 | 52.52 | 43.75 | 38.56 | 54.09 | |||||||||||
| 1997 | 35.47 | 38.64 | 45.53 | 48.67 | 60.82 | 62.82 | 70.68 | 71.84 | 63.65 | 51.73 | 42.63 | 34.78 | k | 53.86 | ||||||||||||
| 1998 | 37.44 | m | 40.05 | i | 43.77 | 47.55 | 52.95 | 61.00 | 74.18 | 70.79 | 68.12 | 51.23 | 44.08 | 35.85 | k | 57.07 | ||||||||||
| 1999 | 39.05 | k | 38.97 | j | 42.97 | 45.92 | 53.36 | b | ----- | z | 70.29 | 71.84 | 63.17 | 55.19 | 50.02 | 37.82 | f | 56.59 | ||||||||
| 2000 | 36.47 | k | 42.83 | e | 42.89 | c | 53.64 | b | 57.93 | a | 66.87 | 72.45 | a | 71.68 | c | 62.66 | a | 52.40 | b | 36.54 | b | 35.54 | e | 54.13 | ||
| 2001 | 36.53 | a | 38.25 | d | 46.98 | b | 47.66 | a | 61.82 | a | 63.57 | 71.45 | 73.95 | 66.65 | 53.42 | 45.32 | b | 37.42 | k | 55.05 | ||||||
| 2002 | 36.37 | l | 40.09 | 41.47 | 49.92 | 56.55 | 67.67 | 76.48 | 67.74 | 63.70 | 47.61 | 42.37 | 37.14 | j | 55.36 | |||||||||||
| 2003 | 39.97 | k | 35.95 | i | 46.84 | ----- | z | 56.16 | 66.10 | 76.21 | 73.13 | 65.40 | 55.68 | ----- | z | 38.28 | m | 62.79 | ||||||||
| 2004 | 35.62 | k | 39.86 | k | 49.87 | 51.83 | 56.52 | 65.83 | 74.56 | 74.29 | 61.88 | 52.68 | 41.43 | 39.26 | 56.82 | |||||||||||
| 2005 | 36.85 | 38.41 | 46.69 | 49.80 | 59.27 | 62.77 | 74.61 | 73.82 | 61.28 | 53.56 | 40.28 | 33.95 | 52.61 | |||||||||||||
| 2006 | 40.97 | 36.93 | 42.52 | 49.43 | 58.90 | 66.22 | 76.83 | e | 70.66 | 64.27 | 50.38 | e | 42.15 | 36.32 | 52.96 | |||||||||||
| 2007 | 32.12 | f | 38.17 | d | 46.19 | e | 46.79 | i | 58.79 | j | 64.09 | g | 77.05 | 70.13 | e | 62.14 | e | 50.74 | f | 42.25 | f | 35.94 | e | 54.94 | ||
| 2008 | 30.30 | f | 40.67 | f | 41.38 | c | 44.58 | e | 57.36 | f | 60.00 | j | 72.12 | k | 70.93 | k | 62.14 | e | 53.06 | m | 45.63 | g | 31.21 | 44.83 | ||
| 2009 | 31.58 | e | 39.14 | 40.10 | b | 49.00 | 57.90 | e | 66.27 | 76.04 | c | 74.10 | f | 68.09 | g | 50.24 | h | 41.86 | i | 30.82 | n | 51.43 | ||||
| 2010 | 41.93 | i | 41.90 | g | 45.28 | f | 47.93 | 52.02 | e | 62.08 | e | 71.61 | 70.31 | 64.00 | 54.89 | h | 41.10 | i | 37.75 | k | 61.33 | |||||
| 2011 | 36.95 | c | 36.06 | c | 43.98 | 45.70 | g | 52.36 | i | 61.54 | e | 68.45 | i | 72.73 | a | 68.15 | c | 53.28 | d | 42.19 | f | 33.89 | m | 53.24 | ||
| 2012 | 39.69 | b | 38.83 | f | 44.57 | i | 52.48 | b | 56.75 | c | 63.31 | c | 73.62 | c | 75.70 | c | 67.12 | e | 54.10 | j | 43.24 | m | 39.33 | k | 61.24 | |
| 2013 | 33.61 | i | 39.96 | d | 46.33 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 39.96 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 36.58 | 39.28 | 45.10 | 50.12 | 57.41 | 64.51 | 72.59 | 71.50 | 63.88 | 53.14 | 41.74 | 34.80 | 52.72 | |||||||||||||
| S.D. | 3.18 | 4.05 | 2.40 | 2.94 | 2.79 | 2.39 | 3.01 | 2.35 | 2.86 | 2.68 | 3.58 | 3.28 | 0.98 | |||||||||||||
| SKEW | -0.04 | -0.91 | 0.04 | 0.37 | 0.15 | 0.11 | -0.71 | -0.04 | -0.29 | 0.71 | -0.17 | -0.73 | -0.99 | |||||||||||||
| MAX | 41.69 | 45.89 | 49.87 | 56.32 | 63.35 | 69.18 | 77.05 | 76.18 | 68.15 | 61.44 | 50.02 | 39.26 | 53.57 | |||||||||||||
| MIN | 31.58 | 27.57 | 40.10 | 44.58 | 52.02 | 60.72 | 63.31 | 67.02 | 56.83 | 47.61 | 34.15 | 27.29 | 51.10 | |||||||||||||
| NO YRS | 14 | 18 | 30 | 30 | 31 | 29 | 32 | 31 | 33 | 29 | 22 | 13 | 5 | |||||||||||||