| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1959 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 65.64 | p | 65.52 | 57.19 | d | 43.00 | o | 61.35 | ||
| 1960 | 36.57 | c | 40.41 | l | 53.74 | 59.74 | g | 64.86 | c | 82.57 | 91.48 | h | 84.43 | h | 82.95 | k | 69.64 | f | 52.57 | p | 44.06 | m | 59.43 | |||
| 1961 | 44.57 | q | 48.41 | k | 52.78 | m | 61.70 | 67.55 | 84.74 | g | 91.83 | a | 89.26 | 73.33 | 64.03 | a | 48.63 | 35.79 | q | 70.91 | ||||||
| 1962 | 37.38 | g | 42.55 | f | 46.52 | 67.30 | 62.84 | 79.20 | 86.20 | f | 85.71 | c | 81.38 | a | 66.37 | a | 53.54 | b | 46.71 | j | 67.86 | |||||
| 1963 | 41.10 | 52.89 | 49.52 | 51.63 | 68.10 | a | 72.07 | 83.78 | d | 86.00 | b | 80.53 | 68.19 | 49.87 | 42.31 | b | 62.17 | |||||||||
| 1964 | 39.00 | 45.14 | 48.94 | 58.10 | 65.16 | 71.07 | 87.16 | 85.35 | 76.07 | 70.03 | 45.90 | 41.19 | 61.09 | |||||||||||||
| 1965 | 40.00 | 47.57 | 51.74 | 62.40 | 65.26 | 73.76 | a | 86.96 | g | 80.97 | 72.03 | 69.58 | 50.31 | a | 36.73 | a | 59.12 | |||||||||
| 1966 | 38.16 | 37.62 | b | 48.74 | 62.07 | b | 77.17 | b | 77.07 | b | 87.48 | b | 89.18 | c | 78.89 | b | 68.37 | d | 51.23 | d | 40.94 | 63.08 | ||||
| 1967 | 43.10 | 49.68 | 48.58 | 46.00 | b | 69.73 | a | 73.61 | b | 90.24 | b | 91.81 | 80.50 | 68.20 | a | 52.48 | a | 37.19 | 62.59 | |||||||
| 1968 | 40.32 | 48.90 | 55.28 | b | 59.59 | a | 67.55 | b | 80.74 | c | 90.69 | b | 78.50 | a | 77.29 | b | 65.70 | a | 45.87 | 38.83 | b | 62.44 | ||||
| 1969 | 42.53 | a | 38.56 | a | 48.79 | b | 61.23 | 74.78 | d | 74.07 | 87.52 | d | 89.17 | a | 79.31 | a | 55.70 | a | 52.83 | 42.67 | a | 62.26 | ||||
| 1970 | 40.68 | f | 49.57 | 50.38 | b | 52.14 | a | 69.40 | a | 81.91 | h | 88.37 | d | 89.59 | b | 73.66 | a | 60.80 | a | 50.71 | m | 39.19 | d | 63.68 | ||
| 1971 | 44.32 | 47.89 | a | 47.55 | ----- | z | 65.75 | c | 74.34 | a | 86.00 | q | 90.64 | c | 72.93 | 57.17 | b | 48.36 | e | 36.20 | a | 58.52 | ||||
| 1972 | 39.04 | h | 45.48 | b | 59.52 | d | 55.92 | f | 72.81 | e | 80.09 | h | 89.19 | d | 87.69 | e | 74.70 | c | 59.93 | a | 45.18 | b | 34.62 | e | 63.24 | |
| 1973 | 37.37 | d | 44.18 | f | 48.28 | f | 60.13 | 73.72 | b | 83.08 | e | 88.15 | d | 84.68 | c | 77.78 | g | 64.36 | c | 47.74 | c | 45.60 | f | 67.40 | ||
| 1974 | 38.40 | a | 45.88 | b | 51.07 | d | 58.08 | e | 69.08 | g | 85.00 | u | 87.15 | d | 87.80 | p | ----- | z | ----- | z | ----- | z | 38.00 | l | 56.12 | |
| 1975 | 40.55 | b | 41.91 | e | 46.61 | 49.71 | b | 69.64 | c | 74.92 | e | 88.37 | a | 82.27 | e | 80.46 | b | 58.56 | m | 47.16 | e | 45.31 | e | 60.63 | ||
| 1976 | 44.04 | c | 46.37 | b | 48.74 | 59.27 | d | 75.38 | b | 77.76 | a | 87.30 | d | 78.60 | a | 76.82 | b | 65.97 | b | 59.08 | e | 49.61 | c | 64.08 | ||
| 1977 | 35.29 | 48.26 | e | 45.52 | b | 67.29 | f | 62.17 | b | 83.68 | b | 88.04 | e | 86.22 | d | 77.00 | a | 65.85 | e | 51.59 | c | 46.82 | i | 64.36 | ||
| 1978 | 42.63 | a | 45.07 | 57.86 | c | 56.70 | 64.30 | d | 77.83 | a | 88.52 | b | 86.04 | d | 70.96 | c | 72.28 | b | 47.52 | c | 37.70 | a | 62.28 | |||
| 1979 | 33.79 | b | 42.27 | b | 52.76 | b | 59.25 | b | 71.72 | b | 81.52 | a | 90.00 | f | 84.62 | b | ----- | z | 70.26 | l | ----- | z | 49.00 | s | 60.85 | |
| 1980 | 41.61 | h | 47.60 | i | 48.93 | q | 63.76 | m | 68.00 | h | 70.76 | i | 87.60 | p | 85.62 | o | 76.26 | k | 67.00 | i | 54.60 | t | 49.24 | n | 9999.00 | |
| 1981 | 41.18 | i | 47.00 | k | 50.37 | l | 69.47 | o | 65.79 | g | 77.67 | l | 87.95 | j | 90.46 | c | 81.79 | f | 59.91 | h | 51.57 | i | 44.89 | d | 67.68 | |
| 1982 | 39.61 | 42.54 | 47.55 | 55.43 | 70.00 | 75.53 | ----- | z | 90.67 | m | ----- | z | ----- | z | ----- | z | 37.94 | 52.66 | ||||||||
| 1983 | 42.48 | 45.64 | 48.19 | 52.90 | 67.90 | 74.57 | 82.00 | 82.29 | c | 75.57 | 66.45 | 45.72 | a | ----- | z | 62.16 | ||||||||||
| 1984 | 35.96 | d | 42.52 | b | 51.89 | c | 54.12 | d | 67.72 | b | 72.32 | b | 89.77 | i | 88.30 | k | 76.00 | c | 55.58 | 45.23 | d | 35.27 | e | 53.66 | ||
| 1985 | 36.89 | c | 42.33 | d | 47.45 | b | 65.75 | b | 69.88 | o | 81.96 | e | 90.71 | g | 84.82 | c | 68.62 | f | 65.28 | m | 43.28 | l | 39.70 | h | 59.87 | |
| 1986 | 48.16 | 49.29 | 54.62 | j | 58.43 | 68.71 | 82.90 | 84.13 | 91.55 | 66.33 | ----- | z | 56.94 | l | 42.93 | a | 65.83 | |||||||||
| 1987 | 39.87 | 46.75 | 51.81 | 66.47 | m | 70.71 | 81.17 | 84.78 | h | 88.35 | 83.24 | i | 72.00 | i | 48.63 | ----- | z | 61.04 | ||||||||
| 1988 | 38.19 | 51.55 | 53.53 | a | 63.10 | 64.56 | o | 78.29 | f | 92.29 | 89.39 | 77.77 | 76.58 | 46.23 | 37.10 | 62.57 | ||||||||||
| 1989 | 39.13 | 36.71 | 46.89 | v | 64.52 | i | 64.00 | u | 81.56 | u | 93.08 | r | 81.53 | n | 77.10 | 63.71 | 55.20 | 47.81 | 53.28 | |||||||
| 1990 | 43.74 | 42.93 | 56.42 | 65.90 | 65.32 | 80.03 | 88.87 | 85.26 | 82.33 | 66.35 | h | 51.83 | 33.42 | 63.28 | ||||||||||||
| 1991 | 43.32 | 54.48 | a | 46.60 | a | 56.73 | 62.33 | j | 73.18 | m | 85.26 | l | 88.61 | 82.13 | 69.03 | 54.16 | k | 43.76 | j | 62.99 | ||||||
| 1992 | 44.29 | 53.61 | k | 57.48 | 66.63 | 80.81 | 81.00 | 86.58 | 89.10 | 78.70 | 65.79 | l | 46.20 | 36.19 | 66.70 | |||||||||||
| 1993 | 32.61 | 34.18 | 53.87 | 57.67 | 71.71 | ----- | z | 79.65 | 82.03 | 78.30 | 64.32 | 49.85 | j | 42.62 | g | 61.59 | ||||||||||
| 1994 | 46.61 | 43.86 | 59.97 | 62.00 | n | 69.74 | 82.39 | l | 93.33 | a | 90.35 | 79.83 | 66.54 | r | 38.31 | n | 37.81 | 65.19 | ||||||||
| 1995 | 38.94 | 56.75 | 52.58 | l | 50.80 | y | 64.95 | l | 72.00 | m | 85.14 | q | 87.06 | n | 82.00 | p | 68.53 | p | 54.20 | y | 52.38 | w | 47.84 | |||
| 1996 | 37.92 | s | 46.00 | q | 53.54 | r | 61.35 | m | 67.65 | n | 76.73 | o | 92.87 | p | 87.29 | q | 77.25 | n | 67.94 | o | 54.09 | s | 44.14 | q | 9999.00 | |
| 1997 | 41.50 | o | 44.00 | o | 58.28 | m | 56.07 | o | 74.95 | l | 78.21 | p | 88.90 | k | 88.55 | 78.63 | 65.13 | ----- | z | ----- | z | 77.44 | ||||
| 1998 | ----- | z | 41.71 | ----- | z | 57.23 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 39.48 | 46.14 | ||||
| 1999 | 44.71 | 44.54 | 53.00 | i | 56.60 | 67.94 | o | 69.90 | t | 87.80 | u | 78.80 | z | 83.11 | u | 76.46 | r | 53.80 | t | ----- | z | 48.62 | ||||
| 2000 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2001 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 68.32 | 50.30 | 38.23 | 52.28 | ||||
| 2002 | 51.00 | z | 48.64 | 51.55 | 61.77 | 70.48 | 81.57 | 92.42 | 85.06 | 78.60 | 62.74 | 51.83 | 43.23 | 66.17 | ||||||||||||
| 2003 | 50.61 | 43.32 | 55.23 | 54.80 | 70.97 | 83.43 | 93.92 | f | 86.71 | 78.50 | 71.39 | 44.73 | 41.42 | 61.92 | ||||||||||||
| 2004 | 41.32 | 41.45 | 61.03 | 63.47 | 69.03 | 79.27 | h | 89.92 | e | 86.19 | 76.47 | 65.80 | f | 46.13 | 42.45 | 61.75 | ||||||||||
| 2005 | 35.90 | 43.64 | 54.06 | 58.05 | j | 66.36 | f | 72.17 | f | 92.26 | 88.67 | j | 75.30 | 64.06 | 49.53 | ----- | z | 59.25 | ||||||||
| 2006 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2007 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2008 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2009 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2010 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2011 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2012 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2013 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 40.58 | 45.31 | 51.77 | 58.58 | 69.39 | 78.14 | 88.21 | 86.52 | 77.01 | 65.55 | 49.52 | 40.02 | 62.50 | |||||||||||||
| S.D. | 4.02 | 4.86 | 4.28 | 5.05 | 4.18 | 4.07 | 3.29 | 3.49 | 3.51 | 4.79 | 3.72 | 4.01 | 0.85 | |||||||||||||
| SKEW | 0.29 | 0.07 | 0.54 | -0.35 | 0.61 | -0.21 | -0.74 | -0.63 | -0.93 | -0.25 | 0.78 | 0.57 | 0.19 | |||||||||||||
| MAX | 50.61 | 56.75 | 61.03 | 67.30 | 80.81 | 83.68 | 93.33 | 91.81 | 82.33 | 76.58 | 59.08 | 49.61 | 64.08 | |||||||||||||
| MIN | 32.61 | 34.18 | 45.52 | 46.00 | 62.17 | 71.07 | 79.65 | 78.50 | 66.33 | 55.58 | 44.73 | 33.42 | 61.09 | |||||||||||||
| NO YRS | 34 | 35 | 33 | 31 | 31 | 26 | 25 | 33 | 31 | 28 | 29 | 27 | 8 | |||||||||||||