| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1952 | ----- | z | 40.60 | s | 50.86 | b | 66.57 | 69.45 | 72.83 | 86.87 | 84.32 | 80.63 | 70.65 | 43.37 | 39.32 | 66.49 | ||||||||||
| 1953 | 50.37 | a | 49.21 | 53.65 | 56.93 | 63.29 | 67.10 | 84.61 | 80.19 | 79.57 | 64.06 | 53.87 | 46.39 | 62.44 | ||||||||||||
| 1954 | 41.71 | 51.43 | 51.74 | 61.93 | 70.23 | 70.93 | 83.03 | 76.32 | 71.63 | 60.84 | 55.10 | 43.48 | 61.53 | |||||||||||||
| 1955 | 42.16 | 46.71 | 50.55 | 53.70 | 65.58 | 76.87 | 79.10 | a | 85.58 | 75.63 | 64.03 | 47.80 | 42.23 | 60.83 | ||||||||||||
| 1956 | 42.06 | 40.45 | 55.37 | a | 67.83 | 71.26 | 74.20 | 86.90 | 82.84 | 78.07 | 60.48 | 47.90 | 46.90 | 62.86 | ||||||||||||
| 1957 | 30.16 | 48.00 | 50.00 | 61.23 | 70.00 | 77.90 | 82.42 | 79.35 | 80.20 | 57.39 | 50.90 | 48.45 | 61.33 | |||||||||||||
| 1958 | 45.90 | 52.71 | 50.39 | 58.33 | 75.05 | j | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 51.83 | |||||
| 1959 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1960 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1961 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1962 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1963 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1964 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1965 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1966 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1967 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1968 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1969 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1970 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1971 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1972 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1973 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1974 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 82.53 | 83.71 | 85.65 | 81.87 | 65.74 | 50.79 | b | 45.60 | a | 70.84 | ||||||
| 1975 | 44.86 | b | 43.11 | 48.00 | 52.83 | 67.06 | 73.37 | 86.29 | 79.55 | 79.13 | 60.48 | 50.00 | 45.26 | 60.83 | ||||||||||||
| 1976 | 45.26 | 45.76 | 49.90 | 54.90 | 68.39 | 71.67 | 83.00 | 76.65 | 77.63 | 66.67 | a | 50.03 | 45.29 | 61.26 | ||||||||||||
| 1977 | 36.87 | 49.36 | 51.03 | 65.97 | 61.03 | 80.27 | 82.65 | 87.84 | 70.73 | 62.52 | 48.57 | 41.39 | 61.52 | |||||||||||||
| 1978 | 39.13 | 46.64 | 56.26 | 56.27 | 63.13 | 75.97 | 83.61 | 80.45 | 69.30 | 67.52 | 42.13 | 40.81 | 60.10 | |||||||||||||
| 1979 | 24.33 | a | 42.43 | 55.58 | 56.13 | 69.52 | 77.40 | 84.42 | 80.19 | 79.17 | 63.19 | 42.20 | 47.84 | 60.20 | ||||||||||||
| 1980 | 36.94 | 42.59 | 50.29 | 60.60 | 66.48 | 69.27 | 84.23 | 80.35 | 76.33 | 63.39 | 50.10 | 46.52 | 60.59 | |||||||||||||
| 1981 | 38.94 | 45.36 | 52.84 | 58.77 | 64.61 | 71.43 | 80.58 | 87.74 | 75.53 | 60.35 | 51.87 | 42.87 | 60.91 | |||||||||||||
| 1982 | 39.06 | 44.18 | 51.48 | 56.13 | 66.35 | 75.80 | 80.45 | 82.52 | 70.17 | 58.87 | 43.67 | 40.16 | 59.07 | |||||||||||||
| 1983 | 45.23 | 46.96 | 53.23 | 56.67 | 68.94 | 71.70 | 75.71 | 83.97 | 71.70 | 63.06 | 50.80 | 29.29 | 59.77 | |||||||||||||
| 1984 | 41.97 | 46.45 | 54.00 | 54.20 | 63.71 | 70.47 | 85.10 | 84.26 | 71.93 | 57.29 | 46.00 | 38.42 | 59.48 | |||||||||||||
| 1985 | 34.16 | 44.46 | 51.94 | 65.17 | 70.19 | 79.23 | 91.71 | 81.84 | 67.57 | 61.65 | 36.43 | 27.55 | 59.32 | |||||||||||||
| 1986 | 42.83 | b | 44.21 | 57.47 | a | 58.57 | 69.10 | 83.47 | 79.65 | 89.52 | 67.70 | 64.58 | 49.50 | b | 37.84 | 62.03 | ||||||||||
| 1987 | 39.45 | 45.43 | 53.16 | 68.87 | 72.48 | 81.90 | 81.23 | 85.13 | 80.70 | 69.16 | 49.50 | 38.55 | 63.80 | |||||||||||||
| 1988 | 38.35 | 50.17 | 55.13 | 63.03 | 67.35 | 75.33 | 86.32 | 85.87 | 76.90 | 71.23 | 49.30 | 42.29 | 63.44 | |||||||||||||
| 1989 | 44.84 | 34.68 | 51.39 | 64.87 | 66.81 | 78.80 | 83.94 | 80.58 | 76.67 | 61.39 | 54.20 | 42.42 | 61.71 | |||||||||||||
| 1990 | 45.29 | 46.50 | 56.19 | 67.67 | 66.23 | 75.90 | 88.13 | 84.23 | 82.50 | 61.94 | 52.97 | 35.55 | 63.59 | |||||||||||||
| 1991 | 42.84 | 54.75 | 51.52 | 59.53 | 64.00 | 72.53 | 87.23 | 88.97 | 81.37 | 65.58 | 49.30 | 42.10 | 63.31 | |||||||||||||
| 1992 | 45.03 | 50.52 | 59.13 | 63.43 | 76.90 | 83.67 | 83.87 | 87.81 | 74.47 | 65.35 | 48.53 | 36.71 | 64.62 | |||||||||||||
| 1993 | 30.29 | 35.39 | 51.26 | 58.10 | 72.71 | 72.93 | 75.10 | 81.03 | 79.20 | 65.45 | 42.93 | 40.29 | 58.72 | |||||||||||||
| 1994 | 48.65 | 43.68 | 57.81 | 63.20 | 71.13 | 76.00 | 90.71 | 86.10 | 80.50 | 61.71 | 45.20 | 44.87 | 64.13 | |||||||||||||
| 1995 | 39.97 | 51.68 | 52.42 | 57.97 | 69.19 | 73.40 | 83.42 | 81.35 | 79.17 | 60.84 | 53.87 | 40.58 | 61.99 | |||||||||||||
| 1996 | 44.39 | 41.79 | 53.10 | 61.10 | 65.74 | 77.87 | 89.19 | 87.55 | 73.23 | 62.19 | 49.93 | 43.52 | 62.47 | |||||||||||||
| 1997 | 41.97 | 45.46 | 55.77 | 58.87 | 74.32 | 74.90 | 83.90 | 87.00 | 75.83 | 62.06 | 50.03 | 41.97 | 62.67 | |||||||||||||
| 1998 | 45.97 | 47.71 | 54.74 | 59.80 | 64.19 | 76.67 | 90.42 | 88.42 | 81.77 | 60.84 | 49.10 | 41.94 | 63.46 | |||||||||||||
| 1999 | 46.81 | 47.71 | 51.06 | 57.40 | 65.61 | 74.03 | 84.48 | 85.81 | 77.13 | 64.26 | 54.67 | 43.97 | 62.75 | |||||||||||||
| 2000 | 37.87 | 43.93 | 53.00 | 64.50 | 67.52 | 79.03 | 84.71 | 86.13 | 74.63 | 60.06 | 41.37 | 39.19 | 61.00 | |||||||||||||
| 2001 | 39.81 | 43.07 | 55.77 | 57.40 | 74.32 | 74.43 | 84.39 | 88.19 | 79.97 | 63.74 | 49.83 | 40.29 | 62.60 | |||||||||||||
| 2002 | 42.00 | 50.04 | 50.45 | 61.97 | 67.23 | 79.63 | 89.13 | 84.06 | 77.90 | 61.06 | 50.80 | 41.87 | 63.01 | |||||||||||||
| 2003 | 45.84 | 47.46 | 55.97 | 58.00 | 67.61 | 80.60 | 91.71 | 86.35 | 80.17 | 67.06 | 45.00 | 41.74 | 63.96 | |||||||||||||
| 2004 | 34.87 | 45.31 | 59.16 | 64.03 | 68.19 | 78.20 | 88.10 | 86.29 | 73.37 | 63.87 | 50.10 | 44.94 | 63.04 | |||||||||||||
| 2005 | 41.61 | 47.25 | 57.13 | 59.23 | 69.45 | 73.47 | 89.35 | 88.81 | 75.13 | 64.19 | e | 45.87 | 34.81 | 62.19 | ||||||||||||
| 2006 | 47.45 | 44.18 | 49.55 | 60.90 | 71.42 | 78.63 | 91.19 | 86.06 | 78.37 | 63.97 | 50.30 | 40.94 | 63.58 | |||||||||||||
| 2007 | 38.19 | 46.43 | 59.97 | 60.43 | 72.23 | 77.90 | 90.42 | 84.87 | 75.63 | 59.48 | 47.73 | 42.94 | 63.02 | |||||||||||||
| 2008 | 40.74 | 49.00 | 52.81 | 56.23 | 67.58 | 75.83 | 87.39 | 85.13 | 77.90 | 62.61 | 54.40 | j | 41.95 | k | 65.52 | |||||||||||
| 2009 | 42.03 | 43.58 | p | 49.32 | i | 60.77 | h | 65.65 | k | 77.40 | 89.57 | x | ----- | z | ----- | z | 59.60 | p | 51.36 | e | 37.42 | 52.05 | ||||
| 2010 | 45.87 | 47.79 | 54.77 | 56.27 | 62.68 | 71.03 | 85.55 | 83.23 | 74.73 | 63.29 | 47.27 | 40.13 | 61.05 | |||||||||||||
| 2011 | 46.35 | e | 44.04 | d | 51.80 | f | 54.72 | e | 63.15 | e | 73.37 | c | 81.23 | e | 89.21 | g | 83.42 | d | 64.71 | j | 52.27 | h | 45.95 | k | 63.76 | |
| 2012 | 44.82 | n | 47.50 | o | 54.12 | o | 66.83 | r | 70.14 | j | 71.35 | m | 87.00 | e | 89.79 | l | 80.87 | g | 62.60 | f | 50.72 | e | 41.09 | h | 68.86 | |
| 2013 | 37.43 | j | 49.33 | j | 54.28 | f | 67.50 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 28.00 | z | 9999.00 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 41.36 | 46.05 | 53.47 | 60.01 | 68.01 | 75.82 | 85.05 | 84.24 | 76.63 | 63.19 | 48.63 | 41.30 | 61.90 | |||||||||||||
| S.D. | 5.20 | 3.97 | 2.93 | 4.12 | 3.53 | 3.83 | 3.94 | 3.36 | 4.05 | 3.11 | 3.95 | 4.33 | 1.53 | |||||||||||||
| SKEW | -1.08 | -0.59 | 0.42 | 0.39 | 0.29 | 0.08 | -0.34 | -0.53 | -0.53 | 0.56 | -0.84 | -1.10 | -0.30 | |||||||||||||
| MAX | 50.37 | 54.75 | 59.97 | 68.87 | 76.90 | 83.67 | 91.71 | 89.52 | 83.42 | 71.23 | 55.10 | 48.45 | 64.62 | |||||||||||||
| MIN | 24.33 | 34.68 | 48.00 | 52.83 | 61.03 | 67.10 | 75.10 | 76.32 | 67.57 | 57.29 | 36.43 | 27.55 | 58.72 | |||||||||||||
| NO YRS | 43 | 42 | 42 | 43 | 42 | 44 | 44 | 42 | 43 | 42 | 43 | 42 | 39 | |||||||||||||