| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1968 | 40.32 | 46.55 | 53.03 | 52.70 | 63.48 | 71.33 | 82.74 | 73.65 | 71.40 | 56.10 | 44.60 | 32.97 | 57.41 | |||||||||||||
| 1969 | 27.23 | 36.68 | 48.39 | 55.47 | 68.71 | 75.27 | 77.58 | 76.81 | 67.83 | 55.71 | 47.07 | 35.32 | 56.00 | |||||||||||||
| 1970 | 33.77 | 43.18 | 47.03 | 48.83 | 64.32 | 76.73 | 79.81 | 79.61 | 64.60 | 57.35 | 43.07 | 35.03 | 56.11 | |||||||||||||
| 1971 | 39.45 | 43.64 | 42.71 | 53.60 | 66.84 | 66.83 | 80.68 | 83.39 | 67.20 | 57.23 | 46.13 | 35.03 | 56.89 | |||||||||||||
| 1972 | 35.45 | 41.17 | 51.35 | 52.07 | 67.97 | a | 72.17 | 78.97 | 80.23 | a | 66.53 | 60.45 | 44.57 | 33.90 | 57.07 | |||||||||||
| 1973 | 34.65 | 44.00 | 50.97 | 59.67 | 70.16 | 72.87 | 84.77 | 80.74 | 71.80 | 57.29 | 37.73 | 39.48 | 58.68 | |||||||||||||
| 1974 | 31.26 | 43.43 | 47.97 | 55.33 | 61.84 | 78.43 | 79.65 | 81.97 | 76.70 | 62.94 | 45.30 | 39.35 | 58.68 | |||||||||||||
| 1975 | 36.58 | 38.61 | 44.71 | 52.27 | 65.74 | 70.73 | 83.65 | 74.81 | 75.20 | 54.26 | 42.23 | 39.32 | 56.51 | |||||||||||||
| 1976 | 40.20 | a | 39.83 | 45.26 | 54.07 | 66.61 | 68.30 | 78.81 | 75.52 | 74.27 | 61.13 | 48.43 | 40.58 | 57.75 | ||||||||||||
| 1977 | 33.03 | 43.86 | 46.45 | 65.30 | 60.42 | 78.80 | 79.39 | 83.74 | 65.93 | 58.71 | 42.20 | 37.00 | 57.90 | |||||||||||||
| 1978 | 35.94 | 42.54 | 53.16 | 55.03 | 61.97 | 75.70 | 80.00 | 76.32 | 65.21 | a | 63.19 | 39.73 | 30.03 | 56.57 | ||||||||||||
| 1979 | 26.19 | 39.89 | 52.68 | 56.70 | 67.77 | 75.13 | 84.00 | 80.48 | 75.67 | 60.59 | b | 39.10 | 40.00 | 58.18 | ||||||||||||
| 1980 | 29.67 | a | 39.30 | b | 47.34 | b | 62.41 | a | 67.90 | a | 70.41 | a | 80.97 | 77.03 | 72.77 | 62.63 | a | 44.07 | 42.41 | b | 58.08 | |||||
| 1981 | 39.26 | 42.30 | a | 52.81 | 56.93 | 65.06 | 69.30 | 78.87 | 85.07 | b | 73.69 | a | 54.89 | l | 46.59 | a | 36.57 | a | 58.77 | |||||||
| 1982 | 35.87 | 41.11 | 49.19 | 54.17 | 66.70 | a | 76.73 | 80.06 | 80.58 | 69.93 | 56.58 | 40.30 | 33.48 | 57.06 | ||||||||||||
| 1983 | 40.87 | 42.96 | 50.10 | 56.47 | 70.84 | 71.10 | 76.29 | 82.52 | 67.83 | 61.90 | 42.73 | 27.29 | 57.58 | |||||||||||||
| 1984 | 38.90 | 42.28 | 52.52 | 53.43 | 62.32 | 71.80 | 83.39 | 82.48 | 68.03 | ----- | z | 40.10 | 32.13 | 57.03 | ||||||||||||
| 1985 | 28.90 | 39.29 | ----- | z | 60.17 | 67.74 | 73.80 | 90.06 | 80.97 | 64.60 | 56.23 | 31.53 | 26.58 | 56.35 | ||||||||||||
| 1986 | 38.68 | 40.50 | 54.32 | 57.27 | 67.45 | 79.90 | 76.97 | 86.42 | 64.63 | 63.77 | 43.03 | 33.61 | 58.88 | |||||||||||||
| 1987 | 35.00 | 43.54 | 49.32 | 62.93 | 68.55 | 80.33 | 77.19 | o | 82.00 | t | 78.60 | y | ----- | z | 47.42 | r | 33.18 | n | 56.61 | |||||||
| 1988 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 73.10 | a | 81.74 | 81.13 | 74.00 | 69.39 | 45.32 | k | ----- | z | 75.87 | |||||
| 1989 | ----- | z | 41.27 | q | ----- | z | 60.97 | 65.30 | k | 74.57 | 80.42 | 76.81 | 75.10 | 60.65 | 49.91 | s | 41.82 | n | 71.42 | |||||||
| 1990 | ----- | z | 42.27 | q | 52.87 | 62.33 | 62.77 | 72.35 | d | 85.29 | 82.32 | 81.77 | 58.30 | a | 49.20 | t | 31.62 | r | 69.75 | |||||||
| 1991 | ----- | z | ----- | z | 48.39 | 56.00 | 60.97 | a | 67.63 | 83.52 | 86.64 | i | 79.72 | a | 64.87 | a | ----- | z | 41.57 | x | 65.87 | |||||
| 1992 | 38.88 | w | 49.75 | u | 60.50 | m | 61.74 | k | 73.67 | m | ----- | z | 81.87 | 85.84 | 70.29 | m | 73.50 | y | ----- | z | ----- | z | 83.85 | |||
| 1993 | ----- | z | 43.50 | z | 48.19 | o | 53.73 | 73.85 | r | 71.64 | p | 72.40 | k | 78.64 | q | 79.19 | i | 66.45 | 45.00 | q | 39.88 | o | 60.09 | |||
| 1994 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1995 | 37.32 | 47.46 | 50.90 | a | 56.27 | 68.94 | 71.50 | 80.71 | 77.61 | 76.83 | 57.90 | 48.13 | 34.71 | 59.02 | ||||||||||||
| 1996 | 37.55 | 40.53 | j | 51.13 | 58.77 | 61.32 | 74.10 | 86.81 | 87.81 | j | 72.20 | 58.87 | 46.00 | j | 34.70 | a | 59.49 | |||||||||
| 1997 | 36.45 | 41.07 | 48.29 | 54.70 | 70.29 | ----- | z | 80.97 | 84.13 | 74.13 | ----- | z | 46.57 | 37.45 | 57.41 | |||||||||||
| 1998 | 38.90 | 43.50 | 52.87 | 58.43 | 65.23 | a | 73.10 | 87.39 | 87.97 | 81.50 | 60.81 | 45.37 | 36.29 | 60.95 | ||||||||||||
| 1999 | 42.14 | i | 40.28 | j | 50.00 | i | ----- | z | 64.16 | 71.60 | 81.77 | 84.81 | 76.00 | 63.68 | i | 49.05 | j | 41.45 | k | 75.67 | ||||||
| 2000 | 37.00 | i | 41.95 | j | 49.48 | 63.50 | 65.52 | 75.73 | 82.52 | 84.50 | a | 74.30 | 61.33 | j | 40.80 | 34.00 | 63.37 | |||||||||
| 2001 | 36.93 | q | 44.36 | q | 53.05 | j | 55.13 | 71.35 | 72.17 | 82.87 | 85.87 | 78.83 | 60.74 | 44.73 | 34.81 | 65.17 | ||||||||||
| 2002 | 37.55 | 44.54 | 45.35 | 58.47 | 64.65 | 74.57 | 86.00 | 82.32 | 76.37 | 61.06 | 47.67 | 35.29 | 59.49 | |||||||||||||
| 2003 | 36.38 | w | 47.32 | i | 51.74 | 56.10 | 65.90 | 78.87 | 89.97 | 85.68 | 77.73 | 65.88 | g | 40.30 | 36.14 | i | 68.29 | |||||||||
| 2004 | 31.44 | f | 41.72 | 55.52 | 63.07 | 65.10 | 75.67 | 85.35 | 84.87 | 71.27 | 60.90 | 49.00 | f | 40.48 | 64.39 | |||||||||||
| 2005 | 37.00 | 47.32 | 55.68 | 57.70 | 67.74 | 71.90 | 86.42 | 87.71 | 74.43 | 60.56 | d | 41.03 | 31.62 | b | 59.93 | |||||||||||
| 2006 | 39.61 | 42.07 | 47.55 | 56.73 | 68.03 | 74.17 | 86.55 | 83.81 | 76.33 | 60.81 | ----- | z | 34.57 | c | 60.93 | |||||||||||
| 2007 | 33.65 | 41.32 | 53.16 | 57.37 | 69.71 | ----- | z | 87.16 | 80.61 | 72.80 | 56.61 | 43.73 | 34.55 | 57.33 | ||||||||||||
| 2008 | 32.71 | 43.83 | 45.87 | 52.53 | 66.00 | 71.07 | 83.74 | 80.32 | 70.88 | f | 58.87 | 47.50 | 32.94 | 55.94 | ||||||||||||
| 2009 | 35.10 | 40.07 | 42.87 | 55.57 | 67.74 | 75.37 | 86.65 | 84.03 | 77.23 | 54.42 | 43.73 | 31.71 | 57.87 | |||||||||||||
| 2010 | 38.39 | 44.50 | 51.00 | 54.00 | 60.19 | 69.63 | 82.65 | 81.52 | 70.33 | 61.23 | 40.73 | 34.31 | e | 57.37 | ||||||||||||
| 2011 | 42.52 | h | 39.71 | d | 44.00 | 49.81 | c | 60.75 | c | 69.12 | d | 77.21 | c | 84.92 | e | 78.26 | c | 57.53 | a | 42.06 | n | 39.48 | f | 62.37 | ||
| 2012 | 37.71 | n | 41.14 | g | 44.58 | g | 58.43 | g | 64.10 | b | 69.11 | b | 83.27 | a | 86.60 | a | 78.88 | d | 78.00 | z | 50.00 | w | 37.57 | q | 76.39 | |
| 2013 | 36.36 | q | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 35.66 | 42.24 | 49.61 | 56.65 | 65.82 | 73.27 | 82.56 | 81.89 | 73.05 | 59.89 | 43.19 | 35.08 | 57.91 | |||||||||||||
| S.D. | 3.87 | 2.48 | 3.50 | 3.80 | 3.07 | 3.37 | 3.43 | 3.67 | 4.84 | 3.34 | 3.62 | 3.60 | 1.25 | |||||||||||||
| SKEW | -0.86 | 0.14 | -0.25 | 0.36 | -0.21 | 0.26 | 0.26 | -0.46 | -0.25 | 0.60 | -0.96 | -0.17 | 0.61 | |||||||||||||
| MAX | 40.87 | 47.46 | 55.68 | 65.30 | 71.35 | 80.33 | 90.06 | 87.97 | 81.77 | 69.39 | 48.43 | 42.41 | 60.95 | |||||||||||||
| MIN | 26.19 | 36.68 | 42.71 | 48.83 | 60.19 | 66.83 | 76.29 | 73.65 | 64.60 | 54.26 | 31.53 | 26.58 | 56.00 | |||||||||||||
| NO YRS | 31 | 32 | 36 | 40 | 40 | 40 | 42 | 40 | 40 | 35 | 31 | 33 | 22 | |||||||||||||