| 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 | ----- | z | 33.38 | d | 22.27 | e | 27.83 | |
| 1979 | 18.31 | e | 26.84 | f | 36.33 | k | 38.67 | c | 50.37 | a | 60.77 | 68.17 | b | 64.36 | f | 63.87 | k | 45.52 | j | 33.50 | j | 33.47 | p | 47.26 | ||
| 1980 | 24.78 | m | 35.35 | f | 28.80 | i | 42.41 | h | ----- | z | 54.05 | j | 68.17 | j | 61.50 | g | ----- | z | ----- | z | ----- | z | 35.25 | u | 9999.00 | |
| 1981 | 35.08 | r | 31.92 | j | 33.12 | j | 45.85 | j | 45.33 | p | ----- | z | 66.58 | l | 71.76 | j | 62.53 | l | 43.57 | i | 40.78 | l | 29.60 | p | 9999.00 | |
| 1982 | 22.95 | k | 24.12 | c | 28.67 | m | 35.97 | j | 45.53 | k | 56.74 | i | 63.07 | j | 67.64 | i | 53.83 | i | 41.88 | j | 29.77 | j | 25.88 | k | 24.12 | |
| 1983 | 33.10 | j | 29.15 | a | 33.76 | 34.22 | j | 46.12 | j | 55.07 | a | 62.25 | k | 65.71 | 55.65 | 49.50 | j | 34.03 | j | 19.84 | o | 47.87 | ||||
| 1984 | 27.07 | j | 28.84 | 32.60 | 35.45 | 45.65 | 52.00 | 68.23 | 67.89 | 55.48 | 38.82 | 29.07 | 23.10 | 43.37 | ||||||||||||
| 1985 | 25.76 | 23.45 | 30.42 | 44.90 | 53.50 | 63.37 | 73.28 | a | 64.65 | 48.91 | a | 44.68 | 24.95 | 29.24 | b | 43.93 | ||||||||||
| 1986 | 36.13 | 33.62 | 42.24 | 40.40 | 50.48 | a | 64.48 | 65.40 | 73.74 | 48.92 | 48.35 | 34.95 | a | 31.90 | 47.55 | |||||||||||
| 1987 | 24.56 | 30.29 | 33.42 | 47.62 | 51.81 | 59.60 | 61.81 | 65.60 | 63.12 | 53.85 | 36.35 | 26.38 | k | 48.00 | ||||||||||||
| 1988 | 26.69 | 34.21 | a | 34.34 | 45.30 | j | 51.68 | a | 61.27 | 67.69 | 66.71 | 57.45 | 55.63 | 29.90 | 26.63 | 46.56 | ||||||||||
| 1989 | 25.47 | 21.82 | 34.08 | 45.27 | 47.81 | 61.10 | 70.82 | 63.19 | 59.73 | 46.02 | 34.74 | a | 31.00 | 45.09 | ||||||||||||
| 1990 | 30.06 | 26.79 | 36.55 | 46.53 | 46.21 | 57.58 | 67.95 | 66.95 | 64.97 | 47.66 | 35.98 | 20.94 | n | 47.93 | ||||||||||||
| 1991 | 27.11 | i | 39.16 | i | 30.86 | j | 38.52 | 44.03 | l | 53.30 | j | 68.20 | i | 70.73 | i | 60.16 | a | ----- | z | 33.57 | 30.61 | 40.71 | ||||
| 1992 | 31.73 | 35.02 | 40.42 | 46.70 | 58.94 | 60.75 | 64.44 | 69.16 | 59.65 | 51.47 | 31.12 | 24.74 | 47.84 | |||||||||||||
| 1993 | 23.42 | 26.71 | 37.56 | 37.68 | 53.45 | 52.05 | 56.77 | 61.35 | 59.57 | 48.11 | 30.78 | 30.16 | 43.14 | |||||||||||||
| 1994 | 32.21 | 26.80 | 40.65 | 43.80 | 53.71 | 60.82 | 72.03 | 70.82 | 62.88 | 44.65 | 25.20 | 26.98 | 46.71 | |||||||||||||
| 1995 | 29.69 | 38.32 | 33.74 | 39.07 | 48.31 | 54.23 | 66.11 | 67.45 | 60.88 | 47.06 | 41.00 | c | 29.13 | a | 46.25 | |||||||||||
| 1996 | 27.92 | 31.76 | 36.53 | 41.68 | 47.05 | 60.33 | 71.84 | 69.85 | 56.02 | 48.66 | 36.90 | 28.77 | 46.44 | |||||||||||||
| 1997 | 27.71 | 29.34 | 36.98 | 37.72 | 54.61 | 57.45 | 67.16 | 69.39 | 62.63 | 49.03 | 39.72 | 32.29 | 47.00 | |||||||||||||
| 1998 | 32.97 | 30.36 | 36.16 | 39.97 | 46.47 | a | 53.15 | 74.10 | 72.37 | ----- | z | 43.11 | 38.28 | a | 23.21 | 44.56 | ||||||||||
| 1999 | 26.82 | 26.64 | n | 33.58 | f | 35.56 | m | 47.35 | n | 52.57 | p | 71.83 | y | 66.04 | r | 58.58 | r | 51.27 | t | 46.40 | t | ----- | z | 26.82 | ||
| 2000 | 26.17 | s | 26.67 | w | 31.38 | s | 45.50 | o | 46.00 | l | 63.24 | m | 71.54 | q | 71.42 | m | 60.88 | q | 43.40 | u | 28.17 | r | 34.17 | y | 9999.00 | |
| 2001 | 26.46 | s | 26.87 | m | 35.70 | u | 43.61 | p | 55.61 | q | 56.25 | p | 63.89 | q | 74.26 | l | 65.87 | o | 48.24 | j | 33.45 | s | 25.53 | o | 9999.00 | |
| 2002 | 24.21 | l | 29.81 | j | ----- | z | 42.40 | j | 46.24 | j | 61.97 | m | ----- | z | 62.71 | j | 57.22 | l | 44.19 | j | 39.27 | o | 30.71 | l | 9999.00 | |
| 2003 | 35.85 | k | 27.93 | n | 34.39 | m | 36.38 | j | 50.78 | o | 60.55 | k | 72.43 | q | 67.71 | q | 54.64 | l | 45.69 | o | 23.82 | m | 24.83 | m | 9999.00 | |
| 2004 | 24.50 | q | 22.77 | p | ----- | z | ----- | z | 42.58 | k | 51.25 | n | 64.14 | m | 63.42 | m | 56.20 | 45.12 | a | 32.78 | 30.95 | 41.26 | ||||
| 2005 | 30.92 | 32.70 | 36.31 | 41.55 | 49.39 | 56.25 | 73.03 | 71.29 | 59.66 | a | 49.53 | 36.12 | 28.58 | a | 47.11 | |||||||||||
| 2006 | 28.98 | b | 27.09 | 29.34 | 39.86 | a | 51.80 | a | 62.08 | e | 74.82 | a | 67.92 | a | 58.72 | 47.02 | 33.27 | d | 24.71 | 45.47 | ||||||
| 2007 | 24.10 | 30.88 | 39.31 | ----- | z | 54.29 | 61.35 | ----- | z | 69.31 | 58.10 | ----- | z | 36.97 | 21.45 | b | 43.97 | |||||||||
| 2008 | 22.97 | 28.54 | a | 29.34 | 34.33 | 47.85 | 57.87 | 70.63 | a | 68.95 | ----- | z | ----- | z | 39.35 | 25.44 | 42.53 | |||||||||
| 2009 | 28.28 | b | 27.43 | ----- | z | 37.78 | 52.37 | 53.98 | b | 68.65 | ----- | z | 64.07 | 40.26 | ----- | z | 22.13 | 43.88 | ||||||||
| 2010 | 29.08 | 28.59 | 31.74 | ----- | z | 39.02 | h | 54.97 | 66.48 | 64.37 | ----- | z | 47.94 | ----- | z | ----- | z | 46.17 | ||||||||
| 2011 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2012 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 71.82 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 71.82 | ||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 27.80 | 29.36 | 35.27 | 40.92 | 50.79 | 58.21 | 68.63 | 67.83 | 58.64 | 47.21 | 34.02 | 27.17 | 46.05 | |||||||||||||
| S.D. | 4.01 | 3.93 | 3.68 | 3.90 | 3.46 | 3.75 | 4.36 | 3.12 | 4.34 | 4.09 | 4.38 | 3.56 | 1.50 | |||||||||||||
| SKEW | -0.19 | 0.24 | 0.12 | 0.25 | 0.36 | -0.20 | -0.87 | -0.15 | -0.84 | -0.04 | -0.52 | -0.18 | -0.74 | |||||||||||||
| MAX | 36.13 | 38.32 | 42.24 | 47.62 | 58.94 | 64.48 | 74.82 | 73.74 | 64.97 | 55.63 | 41.00 | 32.29 | 47.84 | |||||||||||||
| MIN | 18.31 | 21.82 | 29.34 | 34.33 | 45.65 | 52.00 | 56.77 | 61.35 | 48.91 | 38.82 | 24.95 | 21.45 | 43.14 | |||||||||||||
| NO YRS | 21 | 22 | 20 | 19 | 20 | 22 | 21 | 20 | 20 | 19 | 21 | 20 | 11 | |||||||||||||