| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1959 | ----- | z | ----- | z | ----- | z | 63.60 | 62.26 | 80.33 | 88.90 | a | 83.18 | c | 69.30 | 62.35 | h | 52.80 | 37.42 | 67.22 | |||||||
| 1960 | 32.52 | 38.41 | 52.45 | 59.27 | 64.03 | 80.59 | c | 90.10 | 81.93 | a | 79.20 | 63.74 | 46.17 | 37.58 | 60.50 | |||||||||||
| 1961 | 42.10 | 46.79 | 50.00 | a | 59.62 | a | 66.87 | 84.50 | b | 89.60 | a | 88.53 | a | 68.97 | 60.93 | d | 47.69 | a | 37.00 | a | 61.88 | |||||
| 1962 | 32.11 | c | 39.39 | 47.85 | d | 65.48 | a | 63.35 | 77.24 | a | 83.50 | c | 83.38 | e | 79.63 | k | 64.74 | 50.80 | 42.03 | a | 59.08 | |||||
| 1963 | 39.42 | 52.18 | 50.87 | 51.90 | 69.17 | a | 72.74 | c | 83.10 | 83.58 | 80.22 | c | 68.26 | 49.83 | 37.84 | 61.59 | ||||||||||
| 1964 | 37.42 | 43.03 | 46.29 | c | 58.59 | a | 67.42 | 72.60 | 86.71 | 82.70 | a | 74.52 | a | 69.52 | 46.03 | a | 39.87 | a | 60.39 | |||||||
| 1965 | 38.53 | a | 47.14 | 51.32 | 60.00 | 65.65 | 73.60 | 83.58 | 79.30 | a | 70.79 | b | 70.10 | a | 50.27 | 38.21 | b | 60.71 | ||||||||
| 1966 | 37.58 | 40.96 | 53.30 | a | 62.63 | 73.20 | a | 73.13 | 85.28 | b | 86.00 | b | 79.33 | 66.00 | a | 49.77 | 38.86 | b | 62.17 | |||||||
| 1967 | 42.74 | 48.19 | a | 48.83 | a | 48.93 | 69.00 | a | 75.53 | 89.13 | 90.39 | 81.97 | 64.35 | 51.07 | 37.71 | 62.32 | ||||||||||
| 1968 | 39.19 | 50.28 | 56.00 | 58.97 | 68.00 | 78.47 | 90.77 | 78.61 | 76.53 | 63.61 | 45.37 | 38.19 | 62.00 | |||||||||||||
| 1969 | 37.97 | 38.00 | 47.87 | 61.63 | 73.70 | d | 74.60 | 85.26 | 86.65 | 80.82 | b | 56.50 | a | 51.47 | 41.39 | 61.32 | ||||||||||
| 1970 | 40.48 | 48.75 | 50.00 | 52.83 | 69.23 | 76.90 | 88.74 | 89.29 | 73.20 | 60.43 | a | 47.53 | 35.71 | 61.09 | ||||||||||||
| 1971 | 40.52 | 44.96 | 45.97 | 57.86 | a | 67.83 | a | 72.76 | a | 85.32 | 88.84 | 71.97 | 60.41 | b | 47.33 | 36.68 | 60.04 | |||||||||
| 1972 | 36.39 | 43.97 | 55.68 | 56.57 | 70.68 | 78.38 | a | 86.10 | 86.52 | 70.13 | 62.65 | 45.10 | 32.94 | 60.42 | ||||||||||||
| 1973 | 37.00 | 43.86 | 48.97 | 58.10 | a | 71.73 | a | 79.52 | a | 87.73 | a | 86.89 | d | 75.07 | 65.45 | i | 47.80 | 43.23 | i | 63.67 | ||||||
| 1974 | 38.41 | b | 48.35 | h | 49.22 | d | 57.69 | d | 66.50 | g | 85.00 | n | 80.73 | p | 85.06 | o | 81.47 | k | 64.26 | l | 50.91 | h | 41.42 | l | 48.44 | |
| 1975 | 36.30 | a | 41.23 | f | 45.94 | 48.30 | g | 69.36 | q | 74.62 | f | 86.93 | d | 80.85 | d | 79.25 | f | 62.65 | h | 45.55 | j | 45.09 | h | 62.50 | ||
| 1976 | 40.00 | b | 45.46 | e | 46.79 | c | 57.54 | b | 72.82 | c | 71.92 | e | 84.96 | f | 75.50 | c | 76.93 | a | 66.30 | d | 53.74 | g | 43.73 | e | 59.70 | |
| 1977 | 33.00 | f | 48.60 | c | 48.33 | a | 67.86 | b | 60.71 | c | 83.33 | f | 84.81 | d | 88.44 | m | 77.64 | h | 66.20 | p | 47.32 | e | 39.30 | d | 56.71 | |
| 1978 | 40.00 | r | 45.91 | e | 58.03 | a | 55.90 | 64.42 | 73.52 | a | 83.23 | 81.68 | 70.54 | b | 67.70 | d | 45.27 | 34.03 | b | 61.84 | ||||||
| 1979 | 28.13 | 40.59 | k | 52.23 | 55.38 | d | 68.23 | e | 78.96 | g | 85.89 | d | 79.38 | g | 80.00 | k | 64.17 | b | 43.57 | 42.72 | b | 55.04 | ||||
| 1980 | 37.14 | b | 45.73 | g | 49.33 | s | 62.19 | d | 65.62 | b | 71.28 | e | 84.65 | 81.55 | b | 76.26 | c | 60.31 | e | 49.00 | c | 41.03 | 62.90 | |||
| 1981 | 39.68 | 45.12 | c | 51.61 | 62.07 | b | 64.23 | 75.23 | 84.71 | 88.26 | 77.17 | 57.92 | e | 49.83 | 41.53 | a | 61.45 | |||||||||
| 1982 | 33.61 | 40.82 | 47.23 | 55.00 | 66.65 | 74.87 | 81.00 | c | 83.84 | 71.87 | 61.00 | 42.23 | 35.74 | 57.82 | ||||||||||||
| 1983 | 41.55 | 46.14 | 49.39 | 53.60 | 67.26 | 72.47 | 79.10 | 82.42 | 73.50 | 63.16 | 47.27 | 31.81 | 58.97 | |||||||||||||
| 1984 | 28.74 | 37.45 | 48.32 | 51.57 | 64.61 | 68.17 | 81.84 | 80.93 | a | 68.33 | f | 53.46 | c | 44.89 | c | 32.78 | d | 53.89 | ||||||||
| 1985 | 28.00 | c | 35.37 | a | 42.77 | a | 58.70 | 65.16 | 75.07 | a | 84.74 | 76.48 | 65.23 | 59.26 | l | 37.64 | e | 25.97 | a | 54.10 | ||||||
| 1986 | 42.12 | n | 38.58 | p | 54.24 | n | 55.64 | b | 69.41 | i | 80.82 | h | 79.00 | 86.95 | k | ----- | z | 71.67 | p | 55.38 | v | 38.35 | n | 67.32 | ||
| 1987 | 39.00 | 43.81 | a | 48.84 | 66.00 | n | 72.60 | k | 78.18 | m | 77.06 | 79.74 | 74.29 | p | 66.52 | j | 47.35 | j | 38.19 | j | 57.69 | |||||
| 1988 | 39.22 | v | 45.78 | b | 50.06 | n | 61.18 | m | 66.89 | l | 73.68 | b | 83.22 | m | 80.95 | l | 70.63 | 68.50 | i | 46.50 | l | 39.10 | u | 63.36 | ||
| 1989 | 33.20 | k | ----- | z | 53.85 | k | 63.80 | 65.90 | 79.27 | 84.03 | 76.48 | 74.17 | 58.77 | i | 48.15 | c | 42.06 | 66.73 | ||||||||
| 1990 | 43.52 | 42.71 | 53.90 | 66.87 | 64.45 | 77.13 | 86.55 | 81.03 | 79.00 | 63.74 | 49.20 | 33.13 | 61.77 | |||||||||||||
| 1991 | 39.32 | 52.29 | 49.48 | 54.40 | j | 62.74 | 73.13 | o | ----- | z | 84.05 | i | 77.43 | 64.55 | 45.40 | j | 40.39 | 55.17 | ||||||||
| 1992 | 41.00 | 50.48 | 58.52 | 64.43 | 77.00 | 78.83 | 81.77 | 85.23 | 77.17 | 65.68 | 42.40 | 34.61 | 63.09 | |||||||||||||
| 1993 | 29.03 | 31.25 | 46.58 | 55.87 | 70.10 | 69.13 | 72.81 | 76.90 | 75.60 | 62.52 | 42.73 | 38.23 | 55.90 | |||||||||||||
| 1994 | 43.29 | 42.07 | 57.13 | 61.67 | 68.74 | 76.43 | 87.97 | 86.45 | 78.17 | 61.61 | 38.90 | 36.16 | 61.55 | |||||||||||||
| 1995 | 41.00 | 53.00 | 51.03 | 55.80 | ----- | z | 71.77 | 82.06 | 82.19 | 76.23 | 62.94 | 55.33 | 40.10 | 61.04 | ||||||||||||
| 1996 | 39.23 | 43.17 | 53.10 | 59.87 | 63.90 | 75.47 | 87.06 | 83.32 | 73.00 | 61.97 | 48.93 | 41.00 | 60.83 | |||||||||||||
| 1997 | 39.06 | 42.93 | 55.90 | 56.70 | 72.45 | 72.83 | 82.29 | 83.48 | 75.53 | 60.94 | 50.93 | ----- | z | 63.01 | ||||||||||||
| 1998 | 46.71 | 44.14 | 51.10 | 57.30 | 63.89 | v | 72.40 | 87.39 | 84.71 | 77.00 | 61.77 | i | 45.43 | 35.03 | 60.12 | |||||||||||
| 1999 | 39.90 | 41.50 | 49.71 | 53.75 | n | 64.26 | 69.87 | o | 85.00 | o | 80.84 | 74.50 | 71.50 | q | 54.90 | i | 40.53 | n | 58.45 | |||||||
| 2000 | 39.82 | i | 47.50 | k | 53.22 | m | 64.45 | j | 67.39 | 81.53 | k | 83.00 | p | 86.69 | o | 72.93 | p | 55.56 | v | 37.68 | k | 36.16 | 51.77 | |||
| 2001 | 33.37 | l | 38.08 | o | 54.52 | j | 62.42 | k | 73.78 | m | 75.53 | 83.10 | b | 87.77 | 80.00 | o | 65.50 | y | 50.81 | i | 36.00 | j | 82.14 | |||
| 2002 | 39.81 | o | 40.77 | o | 49.77 | 57.09 | s | 68.47 | l | 77.50 | t | 91.74 | h | 81.85 | r | 84.71 | w | ----- | z | ----- | z | ----- | z | 49.77 | ||
| 2003 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 75.00 | x | 91.38 | j | 85.80 | k | 76.00 | k | 68.57 | j | 44.47 | o | 41.40 | p | 9999.00 | |
| 2004 | 31.42 | s | 38.47 | l | 58.50 | q | 61.35 | m | 69.57 | q | 81.20 | o | 86.25 | s | 87.50 | w | 71.94 | l | 60.94 | o | 47.86 | p | 41.00 | n | 9999.00 | |
| 2005 | 36.25 | s | 42.86 | n | 51.58 | l | 60.12 | v | 62.40 | p | 73.25 | r | 88.69 | o | ----- | z | 78.08 | r | 62.77 | r | 46.69 | n | 30.42 | s | 9999.00 | |
| 2006 | 40.21 | q | 43.07 | n | 46.53 | n | 55.17 | r | 69.53 | n | 78.83 | r | 87.10 | u | 79.25 | k | ----- | z | 58.56 | m | 49.73 | o | 39.36 | q | 9999.00 | |
| 2007 | 39.35 | n | 45.88 | l | 55.00 | l | 61.71 | w | 71.08 | r | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2008 | 33.65 | 40.76 | 46.94 | 54.23 | 68.68 | 73.60 | 85.18 | n | 83.68 | 74.80 | 61.97 | 50.27 | 37.35 | 56.90 | ||||||||||||
| 2009 | 39.81 | 46.90 | r | 50.20 | f | 56.50 | 70.61 | 71.57 | 85.74 | 81.39 | 80.37 | 56.06 | 47.40 | 32.19 | 62.16 | |||||||||||
| 2010 | 40.58 | 41.75 | 50.23 | 55.13 | 58.77 | 70.87 | 82.48 | 79.10 | 73.90 | 61.48 | 43.90 | 36.97 | 57.93 | |||||||||||||
| 2011 | 35.65 | 39.61 | j | 47.10 | 51.40 | 60.29 | 69.77 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 52.84 | ||||||
| 2012 | 40.60 | z | 42.45 | 49.81 | 58.00 | 64.48 | 71.53 | 83.87 | 83.84 | 75.83 | 59.52 | 45.37 | 35.58 | 60.93 | ||||||||||||
| 2013 | 25.48 | 39.32 | 51.68 | 58.00 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 38.83 | ||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 37.54 | 43.90 | 50.38 | 58.21 | 67.04 | 74.70 | 84.60 | 83.09 | 75.05 | 62.67 | 47.16 | 37.34 | 60.65 | |||||||||||||
| S.D. | 4.74 | 4.75 | 3.52 | 4.32 | 3.93 | 3.51 | 3.64 | 3.74 | 3.75 | 3.69 | 3.68 | 3.63 | 1.73 | |||||||||||||
| SKEW | -0.85 | -0.19 | 0.53 | 0.21 | 0.25 | 0.57 | -0.89 | -0.06 | -0.38 | -0.21 | -0.43 | -0.68 | -1.24 | |||||||||||||
| MAX | 46.71 | 53.00 | 58.52 | 67.86 | 77.00 | 84.50 | 90.77 | 90.39 | 81.97 | 70.10 | 55.33 | 43.73 | 63.09 | |||||||||||||
| MIN | 25.48 | 31.25 | 42.77 | 48.93 | 58.77 | 68.17 | 72.81 | 75.50 | 65.23 | 53.46 | 37.64 | 25.97 | 55.90 | |||||||||||||
| NO YRS | 40 | 38 | 42 | 41 | 40 | 39 | 40 | 40 | 37 | 33 | 37 | 38 | 21 | |||||||||||||