| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1961 | ----- | z | ----- | z | ----- | z | 58.33 | r | 67.81 | 87.43 | 92.52 | 91.06 | 72.87 | 64.74 | 49.97 | 41.81 | 71.03 | |||||||||
| 1962 | 41.65 | 41.96 | 47.55 | 66.33 | 63.77 | 80.03 | 87.90 | 84.16 | 81.67 | 65.13 | 53.07 | 48.90 | 63.51 | |||||||||||||
| 1963 | 43.97 | 53.46 | 50.13 | 51.47 | 69.45 | 74.50 | 83.23 | 85.52 | 82.03 | 66.90 | 51.30 | 46.84 | 63.23 | |||||||||||||
| 1964 | 40.87 | 47.59 | 47.81 | 58.87 | 66.55 | 72.73 | 87.84 | 85.23 | 77.47 | 72.35 | 48.27 | 40.57 | a | 62.18 | ||||||||||||
| 1965 | 42.77 | 50.00 | 53.74 | 60.20 | 67.48 | 76.13 | 86.84 | 81.97 | 73.90 | 73.68 | 52.00 | 42.71 | 63.45 | |||||||||||||
| 1966 | 42.29 | 43.82 | 54.52 | 65.63 | 76.81 | 75.10 | 86.10 | 87.97 | 78.97 | a | 68.94 | 50.23 | 43.32 | 64.47 | ||||||||||||
| 1967 | 45.16 | 51.68 | 48.23 | 48.63 | 70.84 | 78.43 | 92.19 | 93.55 | 82.53 | 67.50 | a | 55.03 | 40.16 | 64.50 | ||||||||||||
| 1968 | 43.77 | 51.97 | 57.13 | 60.00 | 69.45 | 80.10 | 92.81 | 79.03 | 77.20 | 65.35 | 48.47 | 40.06 | 63.78 | |||||||||||||
| 1969 | 39.90 | 39.96 | 49.94 | 60.90 | 74.45 | 75.87 | 88.39 | 89.16 | 79.67 | 58.29 | 56.87 | 44.19 | 63.13 | |||||||||||||
| 1970 | 41.61 | 51.21 | 51.00 | a | 53.76 | a | 71.19 | 81.13 | 92.45 | 92.35 | 75.59 | a | 63.74 | 49.63 | 37.65 | 63.44 | ||||||||||
| 1971 | 43.87 | 48.11 | 46.71 | 58.10 | 67.68 | 73.73 | 89.74 | 93.65 | 74.90 | 61.71 | 50.40 | 38.00 | 62.22 | |||||||||||||
| 1972 | 40.20 | a | 47.17 | 58.74 | 58.83 | a | 74.06 | 83.84 | e | 89.69 | b | 87.63 | d | 71.62 | f | 63.87 | a | 46.14 | b | 35.31 | b | 62.32 | ||||
| 1973 | 40.20 | a | 47.46 | 49.16 | 60.17 | 74.13 | 81.30 | 91.29 | 87.13 | 78.47 | 64.55 | 44.27 | 44.77 | 63.57 | ||||||||||||
| 1974 | 37.55 | 47.04 | 50.13 | 58.73 | 68.29 | 86.50 | 86.97 | 87.52 | 83.83 | 67.77 | 53.33 | 46.52 | j | 66.15 | ||||||||||||
| 1975 | 43.31 | e | 43.18 | 48.19 | 50.53 | 69.00 | 76.27 | 87.23 | 82.13 | 82.93 | 62.00 | 48.93 | 46.65 | 61.70 | ||||||||||||
| 1976 | 44.19 | 46.48 | 49.29 | 57.47 | 73.16 | 76.47 | 87.94 | 77.13 | 78.63 | 69.06 | 59.07 | 50.14 | b | 64.09 | ||||||||||||
| 1977 | 42.71 | g | 54.36 | 48.94 | 69.23 | 61.74 | 83.42 | d | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 63.54 | |||||
| 1978 | ----- | z | ----- | z | 58.23 | a | 54.47 | 64.45 | i | 76.70 | 86.32 | 84.68 | 65.30 | j | 72.75 | g | 51.33 | f | 38.35 | 66.46 | ||||||
| 1979 | 34.16 | 42.14 | 52.95 | i | 57.77 | 70.42 | 79.80 | 87.84 | 82.13 | 81.28 | a | 66.23 | a | 46.80 | 46.23 | 63.16 | ||||||||||
| 1980 | 40.39 | 48.28 | 48.81 | 60.10 | 66.35 | 70.37 | 87.16 | 84.13 | 76.33 | 57.65 | h | 51.40 | 47.26 | 61.87 | ||||||||||||
| 1981 | 44.42 | 44.29 | 52.35 | 60.33 | 67.03 | 75.90 | 86.77 | 91.26 | 79.47 | 59.32 | 51.93 | 44.52 | 63.13 | |||||||||||||
| 1982 | 37.81 | 42.79 | 48.06 | 53.37 | 68.45 | 75.07 | 82.23 | 85.84 | 72.60 | 60.94 | 45.00 | 39.23 | 59.28 | |||||||||||||
| 1983 | 45.32 | 46.43 | 47.97 | 53.63 | 69.84 | 74.93 | 80.90 | 85.26 | 76.63 | 67.65 | 47.50 | 36.16 | 61.02 | |||||||||||||
| 1984 | 41.68 | 45.17 | 52.90 | 53.90 | 68.45 | 73.10 | a | 90.39 | 89.00 | 75.87 | 56.39 | 45.97 | 37.71 | 60.88 | ||||||||||||
| 1985 | 36.10 | 41.04 | 48.35 | 65.47 | 69.84 | 81.27 | 92.65 | 85.03 | 68.53 | 62.81 | 41.40 | 39.39 | 60.99 | |||||||||||||
| 1986 | 50.39 | 47.32 | 58.84 | 60.00 | a | 69.32 | 83.97 | 84.58 | 91.77 | 68.20 | 68.19 | 54.13 | 44.19 | 65.08 | ||||||||||||
| 1987 | 40.55 | 48.14 | 51.39 | 71.13 | 73.97 | a | 81.76 | a | 80.70 | a | 86.94 | 83.77 | 75.23 | 51.93 | 39.21 | b | 65.39 | |||||||||
| 1988 | 39.39 | 52.66 | 54.06 | 62.10 | 67.26 | 77.87 | 91.29 | 88.74 | 80.20 | 77.13 | 47.63 | 41.52 | 64.99 | |||||||||||||
| 1989 | 39.77 | 36.79 | 50.29 | 65.00 | 66.71 | 81.80 | 90.13 | 81.84 | 76.67 | 63.52 | 55.07 | 47.13 | 62.89 | |||||||||||||
| 1990 | 44.61 | 44.57 | 54.39 | 67.50 | 66.19 | 77.90 | 91.42 | 86.42 | 83.97 | 66.03 | 50.93 | 37.55 | 64.29 | |||||||||||||
| 1991 | 45.23 | 56.64 | 47.39 | 54.67 | 59.74 | 71.27 | 87.77 | 87.65 | 82.50 | 68.42 | 51.00 | 45.77 | 63.17 | |||||||||||||
| 1992 | 45.32 | 51.79 | 57.42 | 65.03 | 78.48 | 82.37 | 82.39 | 88.26 | 77.67 | 66.00 | 47.23 | 36.81 | 64.90 | |||||||||||||
| 1993 | 33.68 | 35.46 | 51.65 | 55.23 | 72.45 | 71.30 | 76.10 | 80.26 | 78.03 | 64.74 | 47.80 | 41.45 | 59.01 | |||||||||||||
| 1994 | 48.81 | 42.68 | 57.68 | 60.27 | 69.71 | 77.63 | 90.61 | 88.87 | 79.77 | 63.03 | 39.77 | 40.84 | 63.31 | |||||||||||||
| 1995 | 42.06 | 55.07 | 48.26 | 55.00 | 65.00 | ----- | z | ----- | z | 83.84 | 80.10 | 64.23 | 58.30 | 42.90 | 59.48 | |||||||||||
| 1996 | 42.97 | 44.69 | 53.77 | 58.80 | 64.10 | ----- | z | ----- | z | ----- | z | ----- | z | 60.14 | q | 51.07 | p | 41.61 | 50.99 | |||||||
| 1997 | 41.81 | 42.86 | 55.87 | 56.10 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 49.16 | |||||
| 1998 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 44.00 | o | 39.52 | 39.52 | ||
| 1999 | 43.42 | 42.00 | 49.19 | 54.59 | m | 66.00 | q | 75.89 | l | 88.64 | q | ----- | z | 77.86 | p | 73.00 | p | 56.81 | n | 46.10 | a | 45.18 | ||||
| 2000 | 44.87 | 47.43 | a | 49.06 | 67.33 | r | 70.82 | t | 83.58 | r | ----- | z | 87.92 | s | 72.60 | o | 57.50 | q | 43.52 | i | 44.81 | 46.54 | ||||
| 2001 | 40.05 | i | 42.25 | 50.59 | i | 53.57 | p | 75.07 | p | 71.58 | r | ----- | z | 89.67 | v | 79.00 | x | 68.18 | n | 49.37 | k | 38.84 | 40.54 | |||
| 2002 | 40.74 | 47.89 | 47.05 | k | 61.00 | n | 64.00 | n | 80.00 | o | 95.47 | p | 80.87 | p | 78.53 | 62.41 | i | 52.40 | 44.84 | 52.88 | ||||||
| 2003 | 47.58 | 43.91 | f | 51.71 | g | 50.00 | k | 65.13 | h | 78.68 | h | 93.31 | o | 88.53 | p | 80.30 | g | 66.54 | e | 42.88 | f | ----- | z | 57.06 | ||
| 2004 | 41.94 | 41.31 | 61.16 | l | 62.69 | n | 65.00 | i | 78.06 | n | 88.53 | l | 84.65 | h | 73.20 | 62.16 | l | 45.13 | 42.10 | 48.74 | ||||||
| 2005 | 41.13 | 46.61 | 55.18 | i | 57.53 | k | 62.57 | h | 70.00 | h | 92.00 | r | 89.72 | m | 77.62 | n | 63.86 | i | 47.40 | j | 39.00 | h | 43.87 | |||
| 2006 | 42.42 | 44.50 | h | 45.04 | e | 58.39 | l | 71.80 | k | 81.58 | k | 91.50 | s | 83.00 | n | 77.75 | n | 62.96 | h | 48.53 | 41.45 | 44.36 | ||||
| 2007 | 41.52 | 45.14 | 54.35 | e | 58.94 | l | ----- | z | 77.82 | m | 90.60 | f | 89.19 | o | 75.88 | m | 65.40 | k | 53.90 | i | 36.45 | 44.36 | ||||
| 2008 | 36.39 | 43.45 | 47.84 | 55.13 | g | 67.20 | p | 69.70 | t | 89.06 | m | 86.81 | o | 78.94 | n | 68.00 | x | 55.09 | g | 40.45 | 42.03 | |||||
| 2009 | 44.58 | e | 44.32 | 49.53 | l | 60.61 | l | 72.27 | t | 74.94 | l | 89.56 | v | 90.12 | n | 87.86 | w | 61.18 | n | 51.40 | j | 37.08 | e | 41.99 | ||
| 2010 | 45.57 | j | 45.39 | e | 52.53 | n | 51.87 | o | 59.00 | w | 75.58 | r | 86.67 | s | 87.35 | n | 80.31 | q | 46.33 | z | 47.74 | g | 42.04 | f | 45.39 | |
| 2011 | 40.82 | c | 41.31 | b | 47.00 | c | 53.84 | k | 61.78 | m | 75.56 | l | 87.93 | q | ----- | z | 87.50 | z | 66.14 | x | 49.77 | d | 44.53 | a | 44.69 | |
| 2012 | 48.13 | a | 45.09 | f | 49.79 | c | 61.93 | o | 72.50 | q | 72.04 | e | 90.42 | 93.17 | s | 89.86 | w | 53.94 | 39.97 | 42.31 | e | 56.66 | ||||
| 2013 | 33.13 | 44.21 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 50.00 | z | 38.67 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 41.97 | 46.08 | 51.22 | 59.13 | 69.12 | 77.94 | 87.73 | 86.38 | 78.06 | 65.47 | 49.65 | 41.90 | 63.02 | |||||||||||||
| S.D. | 3.68 | 4.58 | 3.74 | 5.32 | 4.00 | 4.42 | 3.96 | 4.01 | 4.03 | 4.87 | 4.47 | 3.68 | 1.66 | |||||||||||||
| SKEW | -0.33 | 0.22 | 0.64 | 0.28 | 0.11 | 0.24 | -0.94 | -0.18 | -0.62 | 0.12 | -0.16 | 0.20 | -0.84 | |||||||||||||
| MAX | 50.39 | 56.64 | 58.84 | 71.13 | 78.48 | 87.43 | 92.81 | 93.65 | 83.97 | 77.13 | 59.07 | 50.14 | 65.39 | |||||||||||||
| MIN | 33.13 | 35.46 | 45.04 | 48.63 | 59.74 | 70.37 | 76.10 | 77.13 | 68.20 | 53.94 | 39.77 | 35.31 | 59.01 | |||||||||||||
| NO YRS | 47 | 47 | 42 | 36 | 35 | 35 | 34 | 34 | 34 | 34 | 38 | 46 | 27 | |||||||||||||