| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1955 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 67.29 | m | 62.65 | 50.83 | 48.42 | 53.97 | ||||
| 1956 | 48.06 | 42.59 | 51.77 | 60.13 | 66.39 | 68.83 | 81.13 | 78.10 | 76.43 | 60.97 | 51.77 | 47.65 | 61.15 | |||||||||||||
| 1957 | 39.45 | 49.89 | 52.48 | 60.93 | 67.19 | 72.80 | 78.03 | 77.23 | 78.63 | 61.58 | 53.93 | 50.90 | 61.92 | |||||||||||||
| 1958 | 49.97 | 56.36 | 54.13 | 58.67 | 72.19 | 71.13 | 84.68 | 85.58 | 74.43 | 68.19 | 53.69 | a | 53.26 | 65.19 | ||||||||||||
| 1959 | 50.39 | 49.25 | 54.68 | 62.97 | 62.55 | 71.87 | 82.97 | 81.03 | 69.57 | 63.68 | 55.33 | 47.94 | 62.68 | |||||||||||||
| 1960 | 46.26 | 50.45 | 55.42 | 59.43 | 62.65 | 76.07 | 84.77 | 78.06 | 74.60 | 64.61 | 54.37 | 47.68 | 62.86 | |||||||||||||
| 1961 | 51.90 | 53.36 | 53.06 | 60.30 | 63.55 | 76.43 | 81.61 | 84.55 | 70.83 | 62.58 | 51.10 | 47.23 | 63.04 | |||||||||||||
| 1962 | 46.32 | 50.79 | 51.42 | 62.60 | 60.00 | 73.60 | 81.23 | 78.06 | 75.77 | 61.97 | 55.43 | 50.06 | 62.27 | |||||||||||||
| 1963 | 43.84 | 58.57 | 54.84 | 54.47 | 66.16 | 69.63 | 73.68 | 78.55 | 76.90 | 63.90 | 54.20 | ----- | z | 63.16 | ||||||||||||
| 1964 | 47.84 | 51.41 | 51.45 | 56.13 | 62.94 | 68.40 | 77.90 | 76.74 | 72.03 | 65.55 | 49.20 | 48.10 | 60.64 | |||||||||||||
| 1965 | 46.39 | 52.39 | 58.87 | 60.67 | 63.65 | 71.87 | 81.94 | 79.74 | 74.27 | 66.77 | 56.63 | 46.58 | 63.31 | |||||||||||||
| 1966 | 46.77 | 50.64 | 55.32 | 63.87 | 68.77 | 74.27 | 78.03 | 81.10 | 75.73 | 64.23 | 54.03 | 50.77 | 63.63 | |||||||||||||
| 1967 | 49.13 | 51.89 | 52.32 | 55.23 | 68.00 | 75.17 | 83.65 | 88.48 | 80.67 | 63.71 | 55.60 | 46.29 | 64.18 | |||||||||||||
| 1968 | 47.90 | 57.17 | 58.13 | 59.10 | 64.90 | 73.03 | 80.77 | 75.68 | 73.20 | 62.55 | 54.70 | 47.29 | 62.87 | |||||||||||||
| 1969 | 41.97 | 47.29 | 58.26 | 59.37 | 69.10 | 70.90 | 77.68 | 78.58 | 74.13 | 61.42 | 53.90 | 50.50 | a | 61.92 | ||||||||||||
| 1970 | 48.97 | 55.57 | 55.48 | 55.40 | 66.32 | 75.83 | 83.32 | 82.00 | 70.47 | 62.81 | 54.90 | 47.23 | 63.19 | |||||||||||||
| 1971 | 46.00 | 50.04 | 50.77 | 57.80 | 64.87 | 67.90 | 80.45 | 82.81 | 72.43 | 60.13 | 51.50 | 45.74 | 60.87 | |||||||||||||
| 1972 | 45.16 | 51.10 | 56.81 | 56.40 | 67.94 | 72.53 | 84.55 | 83.81 | 72.60 | 63.06 | 54.70 | 44.71 | 62.78 | |||||||||||||
| 1973 | 46.23 | 54.00 | 52.06 | 61.70 | 69.84 | 73.43 | 82.81 | 79.52 | 74.43 | 63.16 | 49.93 | 50.84 | 63.16 | |||||||||||||
| 1974 | 44.84 | 48.11 | 52.44 | f | 58.41 | a | 63.65 | 73.00 | 77.94 | 82.00 | 82.63 | 67.61 | 54.33 | 49.81 | 63.85 | |||||||||||
| 1975 | 49.42 | 49.46 | 52.00 | 54.63 | 65.87 | 70.67 | 78.87 | 75.94 | 77.77 | 60.77 | 51.80 | 48.97 | 61.35 | |||||||||||||
| 1976 | 48.77 | 50.10 | 52.65 | 56.53 | 66.71 | 68.77 | 79.42 | 74.94 | 74.90 | 66.23 | 55.17 | 46.71 | 61.74 | |||||||||||||
| 1977 | 47.84 | 55.54 | 52.58 | 62.50 | 60.58 | 74.27 | 78.39 | 84.55 | 69.63 | 62.68 | 52.31 | a | 50.73 | a | 62.63 | |||||||||||
| 1978 | 49.90 | 52.79 | 58.81 | 57.23 | 63.32 | 73.93 | 78.06 | 77.48 | 68.87 | 66.16 | 49.30 | 43.77 | 61.64 | |||||||||||||
| 1979 | 39.32 | 47.21 | 57.68 | 57.40 | 67.10 | 74.50 | 81.68 | 76.90 | 76.07 | 66.68 | 52.23 | 51.45 | 62.35 | |||||||||||||
| 1980 | 45.06 | 52.79 | 53.13 | 61.33 | 63.19 | 66.27 | 79.65 | 78.03 | 74.57 | 67.39 | 55.87 | 51.81 | 62.42 | |||||||||||||
| 1981 | 49.35 | 52.75 | 56.35 | 59.10 | 64.03 | 70.43 | 78.10 | 83.58 | 76.10 | 62.06 | 55.23 | 50.00 | 63.09 | |||||||||||||
| 1982 | 44.16 | 50.68 | 53.94 | 57.73 | 67.26 | 72.33 | 76.13 | 78.58 | 72.33 | 63.65 | 51.27 | 46.45 | 61.21 | |||||||||||||
| 1983 | 50.65 | 52.82 | 55.74 | 60.03 | 67.52 | 68.77 | 72.29 | 77.84 | 72.00 | 63.71 | 54.97 | 43.03 | 61.61 | |||||||||||||
| 1984 | 49.32 | 52.55 | 57.26 | 55.70 | 63.81 | 68.13 | 81.00 | 80.65 | 73.90 | 59.19 | 51.70 | 44.23 | 61.45 | |||||||||||||
| 1985 | 41.87 | 48.11 | 51.55 | 61.60 | 66.58 | 74.93 | 85.68 | 78.87 | 68.73 | 63.03 | 44.93 | 41.94 | 60.65 | |||||||||||||
| 1986 | 51.19 | 51.19 | b | 60.23 | 57.80 | 65.61 | 76.10 | 75.55 | 85.58 | 69.23 | 65.77 | 53.53 | 47.32 | 63.26 | ||||||||||||
| 1987 | 48.32 | 53.68 | 57.45 | 66.20 | 69.84 | 76.70 | 75.68 | 81.55 | 75.93 | 71.58 | 54.47 | 45.77 | 64.76 | |||||||||||||
| 1988 | 46.94 | 53.00 | 57.19 | 60.20 | 63.61 | 70.93 | 81.81 | 81.45 | 76.90 | 67.29 | 52.83 | 47.74 | 63.32 | |||||||||||||
| 1989 | 47.52 | 44.46 | 54.16 | 65.07 | 65.06 | 73.90 | 74.74 | 75.61 | 77.50 | 63.55 | 54.87 | 46.42 | 61.91 | |||||||||||||
| 1990 | 48.32 | 48.00 | 58.13 | 63.17 | 65.00 | 70.37 | 82.77 | 79.35 | 76.10 | 63.29 | 52.93 | 40.65 | 62.34 | |||||||||||||
| 1991 | 46.16 | 57.18 | 53.42 | 57.80 | 61.16 | 68.23 | 82.03 | 81.55 | 79.93 | 67.35 | 54.93 | 47.52 | 63.11 | |||||||||||||
| 1992 | 51.29 | 57.72 | 61.06 | 63.87 | 73.77 | 77.40 | 80.48 | 83.77 | 75.50 | 65.55 | 53.50 | 45.94 | 65.82 | |||||||||||||
| 1993 | 43.52 | 48.89 | 56.74 | 58.03 | 67.81 | 68.90 | 72.35 | 77.45 | 77.67 | 68.23 | 48.93 | 45.81 | 61.19 | |||||||||||||
| 1994 | 50.00 | 49.07 | 59.29 | 61.03 | 68.03 | 70.13 | 83.60 | a | 81.48 | 78.93 | 64.61 | 47.50 | 48.00 | 63.47 | ||||||||||||
| 1995 | 51.45 | 57.43 | 57.45 | 59.47 | 67.52 | 71.20 | 80.45 | 78.77 | 76.87 | 63.52 | 56.93 | 49.84 | 64.24 | |||||||||||||
| 1996 | 48.19 | 53.41 | 58.97 | 61.47 | 63.42 | 72.73 | 84.71 | 83.71 | 73.57 | 62.26 | 54.27 | 49.45 | 63.85 | |||||||||||||
| 1997 | 48.61 | 51.14 | 56.13 | 59.53 | 72.42 | 71.80 | 80.26 | 82.61 | 75.27 | 61.48 | 56.83 | 47.13 | 63.60 | |||||||||||||
| 1998 | 51.06 | 54.25 | 56.16 | 60.00 | 61.06 | 71.90 | 82.81 | 83.45 | 79.70 | 63.74 | 53.33 | 45.48 | 63.58 | |||||||||||||
| 1999 | 48.58 | 50.32 | 53.13 | 59.33 | 63.03 | 70.47 | 78.94 | 78.35 | 78.90 | 67.16 | 57.70 | 46.13 | 62.67 | |||||||||||||
| 2000 | 46.10 | 51.24 | 53.94 | 63.23 | 65.45 | 76.10 | 79.10 | 81.03 | 75.40 | 64.48 | 49.70 | 48.03 | 62.82 | |||||||||||||
| 2001 | 49.29 | 50.50 | 56.29 | 57.57 | 71.10 | 70.67 | 80.68 | 81.23 | 77.77 | 64.48 | 55.60 | 48.39 | 63.63 | |||||||||||||
| 2002 | 47.52 | 52.89 | 52.84 | 60.30 | 63.77 | 73.27 | 82.52 | 81.52 | 76.83 | 62.94 | 55.87 | 50.74 | 63.42 | |||||||||||||
| 2003 | 52.52 | 52.00 | 57.16 | 56.70 | 66.19 | 76.87 | 85.65 | 82.55 | 77.93 | 67.16 | 50.33 | 48.55 | 64.47 | |||||||||||||
| 2004 | 48.68 | 51.55 | 60.52 | 64.17 | 66.39 | 74.03 | 84.29 | 82.06 | 70.53 | 65.53 | p | 53.08 | d | 48.45 | 63.98 | |||||||||||
| 2005 | 49.84 | 54.00 | 60.26 | 59.63 | 66.55 | 69.03 | 82.13 | 84.03 | 74.80 | 64.19 | 50.60 | 47.74 | 63.57 | |||||||||||||
| 2006 | 49.84 | 52.89 | 53.26 | 61.97 | 67.16 | 72.00 | 82.26 | 79.39 | 75.90 | 63.81 | 52.23 | 47.52 | 63.18 | |||||||||||||
| 2007 | 44.35 | 50.46 | 56.27 | a | 58.90 | 65.23 | 70.50 | 80.06 | 78.35 | 73.27 | 58.32 | 51.27 | 45.55 | 61.04 | ||||||||||||
| 2008 | 43.16 | 49.62 | 50.68 | 54.73 | 64.16 | 67.97 | 80.52 | 78.26 | 73.70 | 60.97 | 54.60 | 44.71 | 60.26 | |||||||||||||
| 2009 | 44.68 | 50.25 | 49.90 | 57.67 | 67.16 | 71.33 | 83.13 | 79.06 | 74.27 | 60.29 | 52.17 | 41.97 | 60.99 | |||||||||||||
| 2010 | 52.26 | 53.25 | 53.90 | 56.37 | 60.06 | 66.30 | 79.42 | 78.55 | 70.83 | 61.87 | 50.87 | 47.52 | 60.93 | |||||||||||||
| 2011 | 47.77 | 46.70 | a | 51.52 | 53.97 | 57.11 | c | 66.83 | 74.67 | a | 77.77 | 76.50 | 61.39 | 51.07 | a | 44.10 | a | 59.12 | ||||||||
| 2012 | 47.90 | a | 49.90 | 50.03 | a | 58.27 | 63.45 | 67.74 | c | 76.29 | 81.81 | 75.87 | 64.17 | a | 53.93 | 46.06 | 61.28 | |||||||||
| 2013 | 42.00 | 47.93 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 44.96 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 47.42 | 51.53 | 55.09 | 59.37 | 65.57 | 71.81 | 80.23 | 80.34 | 74.92 | 63.90 | 53.08 | 47.41 | 62.55 | |||||||||||||
| S.D. | 3.05 | 3.17 | 2.95 | 2.86 | 3.20 | 2.91 | 3.28 | 2.91 | 3.10 | 2.54 | 2.51 | 2.58 | 1.32 | |||||||||||||
| SKEW | -0.69 | -0.06 | 0.17 | 0.19 | 0.13 | 0.05 | -0.53 | 0.40 | -0.08 | 0.43 | -0.73 | -0.27 | -0.04 | |||||||||||||
| MAX | 52.52 | 58.57 | 61.06 | 66.20 | 73.77 | 77.40 | 85.68 | 88.48 | 82.63 | 71.58 | 57.70 | 53.26 | 65.82 | |||||||||||||
| MIN | 39.32 | 42.59 | 49.90 | 53.97 | 57.11 | 66.27 | 72.29 | 74.94 | 68.73 | 58.32 | 44.93 | 40.65 | 59.12 | |||||||||||||
| NO YRS | 58 | 58 | 56 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 58 | 57 | 54 | |||||||||||||