| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1961 | ----- | z | 52.59 | f | 56.37 | d | 63.33 | 69.03 | 86.73 | 92.81 | 95.06 | 75.21 | a | 66.97 | 51.50 | 43.35 | 70.04 | |||||||||
| 1962 | 39.77 | 46.68 | 51.31 | b | 68.57 | 65.81 | 80.20 | 88.58 | 84.58 | 83.27 | 66.68 | 54.00 | 46.87 | 64.69 | ||||||||||||
| 1963 | 35.31 | b | 54.67 | a | 56.45 | 56.70 | 72.74 | 73.12 | v | 84.68 | 87.74 | d | 85.17 | a | 70.07 | a | 54.47 | 43.23 | 63.75 | |||||||
| 1964 | 45.00 | a | 50.34 | 53.32 | 61.97 | 69.61 | ----- | z | 89.03 | ----- | z | 77.33 | 72.71 | 49.87 | 43.32 | c | 61.25 | |||||||||
| 1965 | 40.90 | 50.57 | 56.61 | 65.13 | 70.48 | ----- | z | 87.32 | 85.03 | 74.17 | 74.68 | 58.80 | 42.26 | 64.18 | ||||||||||||
| 1966 | 44.77 | 45.89 | 57.81 | 70.07 | 79.84 | 78.90 | 88.40 | a | 89.42 | 80.60 | 68.83 | a | 55.90 | 46.00 | 67.20 | |||||||||||
| 1967 | 47.19 | 53.29 | 54.86 | b | 56.93 | 73.03 | a | 81.07 | 93.77 | 97.48 | b | 87.73 | 68.29 | 53.20 | 42.10 | a | 67.41 | |||||||||
| 1968 | 43.84 | 53.90 | 62.29 | 61.27 | 71.57 | a | 80.93 | 94.76 | b | 81.60 | a | 80.27 | 67.45 | 50.97 | 43.52 | 66.03 | ||||||||||
| 1969 | 37.32 | 44.36 | 56.26 | 64.33 | 76.48 | 81.87 | 88.29 | 90.65 | 81.50 | 61.03 | 55.77 | 45.21 | b | 65.26 | ||||||||||||
| 1970 | 45.17 | b | 52.86 | 54.68 | 56.79 | a | 73.13 | 83.97 | 92.55 | 93.52 | 73.50 | 65.90 | 54.13 | 43.77 | 65.83 | |||||||||||
| 1971 | 45.90 | 50.71 | 51.67 | a | 61.83 | a | 72.68 | 75.73 | 91.61 | 96.74 | 76.50 | 63.58 | 50.52 | a | 41.90 | 64.95 | ||||||||||
| 1972 | 41.16 | 49.55 | 57.61 | 59.80 | 73.97 | 81.27 | 89.58 | 91.74 | 75.77 | 66.03 | 50.17 | 35.94 | 64.38 | |||||||||||||
| 1973 | 39.71 | 51.18 | 56.26 | 63.10 | 75.90 | 82.53 | 91.29 | 90.48 | 79.70 | 65.55 | 48.53 | 47.45 | 65.97 | |||||||||||||
| 1974 | 40.03 | 50.25 | 54.16 | 60.60 | 68.29 | 87.80 | 88.94 | 89.32 | 86.33 | 71.52 | 53.27 | 44.74 | 66.27 | |||||||||||||
| 1975 | 43.35 | 48.21 | 53.13 | 55.77 | 69.61 | 77.87 | 90.35 | 84.52 | 85.60 | 64.29 | 51.97 | 45.35 | 64.17 | |||||||||||||
| 1976 | 44.97 | 49.34 | 54.35 | 60.23 | 75.00 | e | 76.25 | f | 90.57 | j | 81.90 | 83.47 | 71.55 | 56.07 | 46.65 | 62.35 | ||||||||||
| 1977 | 37.90 | 55.04 | 52.68 | 71.10 | 64.00 | 85.87 | 90.65 | 92.16 | 76.54 | d | 66.81 | 50.27 | 46.35 | 65.78 | ||||||||||||
| 1978 | 45.97 | 51.18 | 61.65 | 62.13 | 65.81 | 81.23 | 88.23 | 86.97 | 74.93 | a | 73.65 | 46.30 | 35.73 | a | 64.48 | |||||||||||
| 1979 | 28.39 | 43.21 | 59.10 | 60.70 | 72.45 | 83.57 | 92.52 | 88.10 | 86.40 | 69.81 | 47.53 | 47.50 | m | 66.52 | ||||||||||||
| 1980 | 39.35 | 49.03 | 53.16 | 67.10 | 70.16 | 75.07 | 90.61 | 86.13 | 81.47 | 70.23 | 53.96 | d | 48.61 | 65.41 | ||||||||||||
| 1981 | 48.26 | 50.75 | 58.97 | 64.93 | 70.03 | 77.50 | 87.61 | 95.45 | 83.13 | 66.13 | 55.03 | 46.48 | 67.02 | |||||||||||||
| 1982 | 39.58 | 44.93 | 55.45 | 60.53 | 70.52 | 81.77 | 86.32 | 91.16 | 75.40 | 63.52 | 48.73 | 44.26 | 63.51 | |||||||||||||
| 1983 | 47.39 | 52.32 | 58.06 | 61.03 | 73.19 | 76.37 | 83.84 | 90.23 | 78.67 | 67.97 | 54.30 | 33.16 | 64.71 | |||||||||||||
| 1984 | 41.52 | 48.76 | 57.00 | 59.67 | 68.19 | 74.47 | 93.16 | 93.35 | 77.13 | 61.48 | 51.13 | 38.84 | 63.73 | |||||||||||||
| 1985 | 37.10 | 42.61 | 55.03 | 69.10 | 74.61 | 84.93 | 97.03 | 84.73 | a | 72.50 | 63.84 | 37.93 | 33.52 | 62.74 | ||||||||||||
| 1986 | 45.55 | 50.46 | 62.00 | 64.17 | 73.10 | 89.57 | 85.90 | 97.39 | 74.70 | 69.60 | k | 53.23 | 44.68 | 67.34 | ||||||||||||
| 1987 | 38.81 | 51.07 | 56.52 | 73.93 | a | 76.16 | 86.64 | b | 85.68 | 90.03 | 88.60 | 77.03 | 56.40 | 43.81 | 68.72 | |||||||||||
| 1988 | 39.84 | 53.52 | 57.52 | 69.20 | 74.06 | 80.86 | b | 92.10 | 91.45 | 82.53 | 81.14 | i | 50.50 | l | 43.00 | 68.41 | ||||||||||
| 1989 | 40.90 | j | 37.29 | 55.55 | 68.53 | 70.42 | 85.95 | k | 93.29 | j | 85.03 | 82.11 | k | 67.14 | i | 53.00 | m | 46.05 | k | 63.36 | ||||||
| 1990 | 46.76 | j | 50.00 | o | 62.18 | i | 73.65 | g | 69.95 | j | 82.70 | c | 95.79 | b | 89.53 | a | 89.06 | l | 68.32 | c | ----- | z | 39.95 | l | 84.09 | |
| 1991 | 39.50 | i | 57.44 | j | 53.90 | 61.79 | k | 66.07 | b | 74.19 | i | 92.59 | i | 92.19 | 88.79 | k | 71.10 | b | 50.39 | l | 46.42 | l | 70.82 | |||
| 1992 | 48.32 | i | 56.71 | l | 65.62 | o | 70.33 | f | 83.95 | k | 85.44 | e | 89.09 | i | 96.00 | i | 84.95 | k | 71.59 | i | 47.47 | o | 40.82 | n | 85.44 | |
| 1993 | 34.08 | r | 39.71 | k | 56.58 | 61.43 | 78.63 | l | 76.18 | b | 79.16 | l | 87.50 | a | 85.10 | 69.90 | k | 48.94 | m | 46.50 | m | 73.36 | ||||
| 1994 | ----- | z | 51.38 | l | 63.45 | i | 66.79 | k | 75.95 | j | 83.00 | k | 98.67 | m | 93.23 | 87.28 | l | 66.31 | r | 47.67 | l | 42.17 | m | 93.23 | ||
| 1995 | 47.70 | k | 56.87 | m | 60.00 | b | 62.84 | k | 73.57 | j | 78.25 | b | 90.90 | j | 88.41 | i | 83.71 | i | 65.35 | 55.78 | l | 48.11 | m | 67.87 | ||
| 1996 | 44.50 | k | 51.21 | j | 58.45 | i | 66.64 | h | 67.30 | h | 81.55 | h | 95.13 | h | 94.05 | j | 79.67 | o | 67.50 | i | 55.21 | p | 46.70 | k | 9999.00 | |
| 1997 | 43.65 | k | 50.26 | i | 61.30 | k | 62.67 | 79.86 | i | 79.11 | l | 89.73 | i | 93.24 | j | 83.30 | 68.67 | m | 56.86 | p | 45.22 | m | 72.98 | |||
| 1998 | 47.41 | i | 52.50 | j | 59.52 | j | 67.78 | l | 67.07 | q | 81.50 | b | 97.86 | b | 96.29 | j | 88.41 | h | 69.25 | k | 52.28 | l | 45.74 | l | 89.68 | |
| 1999 | 47.48 | j | 50.72 | j | 56.00 | b | 61.67 | i | 72.62 | j | 79.86 | i | 92.55 | i | 90.29 | 83.61 | g | 71.35 | e | 59.74 | g | 45.15 | k | 72.55 | ||
| 2000 | 44.26 | 53.00 | e | 58.32 | f | 71.80 | e | 73.16 | 82.61 | b | 91.48 | 92.90 | 79.00 | 67.03 | 44.93 | 39.77 | i | 70.02 | ||||||||
| 2001 | 43.29 | 50.29 | 60.35 | e | 61.62 | d | 79.36 | c | 82.47 | 89.16 | 95.68 | 86.73 | 68.68 | 55.75 | j | 43.35 | e | 69.18 | ||||||||
| 2002 | 46.03 | 53.25 | 55.81 | 66.23 | 72.16 | 86.30 | 97.84 | 89.45 | 84.10 | 68.65 | 56.93 | 48.94 | 68.81 | |||||||||||||
| 2003 | 50.23 | 50.00 | 60.54 | e | 63.77 | 76.15 | e | 87.72 | e | 103.26 | 95.85 | e | 87.87 | 73.77 | 54.50 | l | 46.13 | h | 74.91 | |||||||
| 2004 | 44.00 | f | 52.38 | 67.52 | 71.27 | 71.40 | f | 86.23 | 96.03 | 91.97 | 77.67 | 68.54 | e | 53.57 | i | 45.96 | e | 73.06 | ||||||||
| 2005 | 45.16 | f | 53.18 | 59.52 | 61.50 | 71.77 | 77.87 | 96.32 | 95.10 | b | 81.60 | 68.61 | 48.77 | h | 40.64 | i | 73.94 | |||||||||
| 2006 | 47.19 | e | 48.14 | 54.23 | 67.05 | h | 78.88 | e | 83.67 | i | 98.50 | m | 91.65 | h | 85.26 | k | 67.38 | j | 51.61 | l | 47.20 | k | 57.11 | |||
| 2007 | 43.67 | g | 51.50 | h | 62.48 | j | 65.87 | g | 79.52 | f | 86.10 | j | 99.80 | k | 93.70 | h | 83.42 | k | 67.80 | k | 53.17 | l | 44.78 | m | 9999.00 | |
| 2008 | 41.00 | j | ----- | z | 56.00 | i | 63.95 | k | 73.88 | n | 81.58 | k | 93.64 | i | 91.81 | 86.89 | l | ----- | z | 58.59 | m | 44.27 | i | 91.81 | ||
| 2009 | 45.37 | l | 53.71 | k | 53.77 | i | 63.67 | i | 74.26 | l | 85.60 | j | 97.05 | k | 96.74 | h | 91.62 | i | 63.00 | l | 57.89 | k | 40.52 | j | 9999.00 | |
| 2010 | 50.94 | n | 54.26 | i | 61.45 | i | 65.74 | k | 64.76 | n | 77.00 | i | 94.33 | m | 94.27 | i | 84.15 | j | 72.16 | l | 54.89 | l | 44.84 | l | 9999.00 | |
| 2011 | 47.20 | k | 48.44 | l | 56.71 | n | 60.64 | s | 71.57 | j | 81.67 | l | 93.56 | m | 99.12 | o | 94.26 | k | 74.35 | n | 57.60 | t | 47.21 | l | 9999.00 | |
| 2012 | 52.33 | v | 54.00 | j | 60.47 | p | 72.00 | k | 79.24 | n | 79.50 | l | 99.53 | l | 101.00 | h | 91.78 | l | 74.88 | n | 62.30 | t | 47.14 | q | 9999.00 | |
| 2013 | 42.27 | i | 51.82 | k | 62.35 | k | 77.00 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 42.35 | 49.78 | 56.78 | 63.75 | 72.15 | 81.83 | 91.24 | 90.44 | 80.65 | 68.25 | 51.92 | 43.28 | 65.58 | |||||||||||||
| S.D. | 4.51 | 3.82 | 3.29 | 4.62 | 3.79 | 3.99 | 4.29 | 4.16 | 4.66 | 3.64 | 4.27 | 4.08 | 1.61 | |||||||||||||
| SKEW | -0.81 | -1.26 | 0.93 | 0.39 | -0.02 | -0.05 | 0.59 | -0.26 | 0.01 | 0.22 | -1.22 | -1.17 | 0.40 | |||||||||||||
| MAX | 50.23 | 55.04 | 67.52 | 73.93 | 79.84 | 89.57 | 103.26 | 97.48 | 88.60 | 77.03 | 58.80 | 48.94 | 68.81 | |||||||||||||
| MIN | 28.39 | 37.29 | 51.31 | 55.77 | 64.00 | 74.47 | 83.84 | 81.60 | 72.50 | 61.03 | 37.93 | 33.16 | 62.74 | |||||||||||||
| NO YRS | 32 | 35 | 39 | 37 | 36 | 35 | 35 | 40 | 36 | 36 | 29 | 30 | 21 | |||||||||||||