| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1959 | ----- | z | ----- | z | ----- | z | ----- | z | 71.50 | z | 73.80 | 84.94 | 78.53 | a | 67.10 | 61.18 | c | 54.20 | 41.61 | 65.91 | ||||||
| 1960 | 33.23 | a | 37.59 | 50.61 | 56.37 | 61.59 | b | 76.63 | 88.67 | d | 79.00 | 76.70 | 62.97 | a | 43.90 | 37.90 | 58.76 | |||||||||
| 1961 | 43.58 | 45.00 | 47.16 | 57.03 | 62.26 | 80.37 | 85.42 | 85.68 | 67.30 | 60.55 | 45.07 | 36.29 | 59.64 | |||||||||||||
| 1962 | 35.71 | 38.50 | 43.74 | 62.63 | 56.74 | 71.77 | 80.13 | 77.03 | 75.17 | 61.06 | 49.13 | 44.32 | 58.00 | |||||||||||||
| 1963 | 40.00 | 50.25 | 47.35 | 47.43 | 64.58 | 68.03 | 76.26 | 80.52 | 77.63 | 62.61 | 46.47 | 40.94 | 58.51 | |||||||||||||
| 1964 | 36.23 | 44.07 | 43.68 | 54.50 | 63.23 | 69.97 | 81.35 | 79.84 | 74.00 | 68.77 | 44.00 | 35.52 | 57.93 | |||||||||||||
| 1965 | 36.97 | 46.18 | 49.29 | 56.90 | 62.19 | 70.90 | 82.07 | a | 76.13 | 67.53 | 68.87 | 46.97 | 37.00 | 58.42 | ||||||||||||
| 1966 | 36.65 | 39.46 | 50.23 | 59.27 | 71.03 | 69.17 | 79.84 | 81.39 | 74.77 | 63.84 | 47.03 | 39.55 | 59.35 | |||||||||||||
| 1967 | 39.90 | 48.21 | 44.45 | 45.23 | 66.97 | 73.83 | 85.74 | 88.00 | 80.87 | 64.81 | 52.27 | 35.68 | 60.50 | |||||||||||||
| 1968 | 38.61 | 46.72 | 53.97 | 57.03 | 65.23 | 75.37 | 86.19 | 73.55 | 74.67 | 63.13 | 46.40 | 35.35 | 59.69 | |||||||||||||
| 1969 | 34.06 | 35.82 | 47.58 | 57.33 | 69.32 | 71.70 | 80.55 | 82.06 | 74.40 | 55.19 | 52.57 | 41.87 | 58.54 | |||||||||||||
| 1970 | 38.32 | 47.75 | 47.16 | 48.70 | 65.74 | 75.73 | 84.29 | 85.16 | 69.13 | 58.74 | 44.43 | 34.26 | 58.29 | |||||||||||||
| 1971 | 40.29 | 43.14 | 42.74 | 53.67 | 64.74 | 68.67 | 83.39 | 87.10 | 69.13 | 57.81 | 46.63 | 34.52 | 57.65 | |||||||||||||
| 1972 | 35.00 | 41.97 | 54.26 | 52.37 | 67.03 | 75.37 | 83.58 | 83.74 | 69.33 | 61.10 | 44.63 | 30.90 | 58.27 | |||||||||||||
| 1973 | 33.94 | 42.64 | 46.19 | 56.30 | 68.87 | 75.80 | 85.00 | 81.26 | 73.53 | 60.61 | 39.90 | 39.06 | 58.59 | |||||||||||||
| 1974 | 34.55 | 43.82 | 46.65 | 54.80 | 60.87 | 79.90 | 81.45 | 81.55 | 79.23 | 63.77 | 48.69 | a | 38.77 | 59.50 | ||||||||||||
| 1975 | 38.90 | 38.93 | 42.77 | 47.27 | 65.06 | 69.13 | 82.68 | 76.00 | 77.60 | 56.97 | 44.73 | 42.26 | 56.86 | |||||||||||||
| 1976 | 39.81 | 42.24 | 46.06 | 52.43 | 68.00 | 68.27 | 82.13 | 72.29 | 75.00 | 64.97 | 54.97 | 46.94 | 59.43 | |||||||||||||
| 1977 | 39.97 | 51.14 | 45.55 | 63.50 | 55.55 | 77.70 | 81.03 | 82.84 | 68.63 | 63.03 | 44.34 | a | 40.55 | 59.49 | ||||||||||||
| 1978 | 39.58 | 42.61 | 55.29 | 51.43 | 60.23 | 72.00 | 80.48 | 77.58 | 68.23 | 69.16 | 43.03 | 35.16 | 57.90 | |||||||||||||
| 1979 | 28.94 | 38.96 | 51.23 | 53.17 | 66.61 | 74.70 | 83.06 | 78.55 | 79.23 | 63.94 | 43.97 | 43.48 | 58.82 | |||||||||||||
| 1980 | 37.39 | 44.21 | 46.45 | 59.27 | 63.03 | 67.17 | 82.13 | 77.81 | 75.40 | 64.48 | 48.23 | 46.77 | 59.36 | |||||||||||||
| 1981 | 42.13 | 43.79 | 50.03 | 57.63 | 62.58 | 72.37 | 80.42 | 86.77 | 75.00 | 58.23 | 47.47 | 39.26 | 59.64 | |||||||||||||
| 1982 | 34.06 | 39.11 | 45.06 | 51.77 | 64.06 | 71.77 | 77.77 | 81.03 | 67.47 | 57.61 | 41.90 | 35.84 | 55.62 | |||||||||||||
| 1983 | 41.68 | 41.61 | 45.90 | 51.80 | 65.58 | 69.03 | 76.77 | 81.58 | 71.30 | 64.00 | 43.53 | 30.61 | 56.95 | |||||||||||||
| 1984 | 37.10 | 40.62 | 49.55 | 49.90 | i | 64.03 | 68.50 | 84.19 | 83.19 | 69.47 | 52.68 | 42.30 | 35.00 | 56.97 | ||||||||||||
| 1985 | 34.16 | 38.57 | 45.94 | 63.07 | 65.39 | 75.33 | 86.48 | 78.68 | 62.70 | 60.26 | 36.77 | 35.65 | 56.92 | |||||||||||||
| 1986 | 42.48 | 44.14 | 55.45 | 56.37 | 65.81 | 78.37 | 78.61 | 86.71 | 63.70 | 63.48 | 46.97 | 40.77 | 60.24 | |||||||||||||
| 1987 | 36.74 | 43.43 | 48.77 | 67.10 | 67.74 | 78.73 | 75.39 | 80.32 | 80.47 | 71.55 | 44.45 | a | 36.42 | 60.93 | ||||||||||||
| 1988 | 35.84 | 50.79 | 52.77 | 60.77 | 64.94 | 73.13 | 84.10 | 82.71 | 76.27 | 73.13 | 42.83 | 39.42 | 61.39 | |||||||||||||
| 1989 | 35.03 | 31.07 | 45.77 | 61.30 | 63.03 | 75.17 | 83.48 | 77.10 | 73.90 | 60.32 | 50.03 | 45.26 | 58.46 | |||||||||||||
| 1990 | 40.45 | 40.54 | 51.16 | 63.50 | 61.45 | 72.00 | 84.23 | 79.39 | 78.33 | 61.71 | 47.20 | 32.19 | 59.35 | |||||||||||||
| 1991 | 42.13 | 51.39 | 43.87 | 51.87 | 58.97 | 67.03 | 83.00 | 83.35 | 78.83 | 64.16 | 44.57 | 40.10 | 59.11 | |||||||||||||
| 1992 | 38.32 | 49.00 | 55.52 | 61.40 | 73.45 | 77.67 | 77.94 | 82.90 | 67.50 | 63.90 | 43.80 | 32.42 | 60.32 | |||||||||||||
| 1993 | 27.29 | 29.39 | 44.42 | 54.80 | 68.87 | 69.77 | 70.58 | 77.19 | 75.23 | 62.65 | 43.40 | 38.61 | 55.18 | |||||||||||||
| 1994 | 44.74 | 40.07 | 54.94 | 58.97 | 66.45 | 74.00 | 86.23 | 83.39 | 77.03 | 59.10 | 36.77 | 35.87 | 59.80 | |||||||||||||
| 1995 | 37.90 | 49.86 | 46.06 | 53.40 | 64.10 | 69.07 | 81.48 | 81.23 | 76.17 | 61.00 | 51.40 | 36.55 | 59.02 | |||||||||||||
| 1996 | 38.03 | 39.31 | 49.86 | c | 55.90 | 58.19 | ----- | z | 84.03 | 82.84 | 69.33 | 58.77 | 47.27 | 37.26 | 56.44 | |||||||||||
| 1997 | 38.04 | c | 38.18 | 54.19 | o | 53.23 | q | 69.52 | 69.10 | 79.10 | 81.23 | 71.57 | 57.97 | 47.48 | a | 37.65 | 58.98 | |||||||||
| 1998 | 39.19 | 39.75 | 47.68 | i | 53.47 | 55.39 | 68.20 | 85.29 | 80.67 | p | 75.07 | 57.87 | 42.10 | 35.29 | 55.16 | |||||||||||
| 1999 | 40.19 | 36.43 | 43.65 | 51.72 | a | 58.68 | 69.93 | 79.97 | 80.52 | 74.13 | 67.32 | 54.43 | ----- | z | 59.73 | |||||||||||
| 2000 | 39.08 | f | 41.79 | 47.29 | 61.47 | 63.44 | d | 75.96 | c | 79.77 | 83.90 | 71.77 | 57.23 | 39.37 | 39.52 | 60.14 | ||||||||||
| 2001 | 35.42 | 38.75 | 49.87 | 53.10 | 69.35 | 69.93 | c | 78.94 | 83.68 | 75.17 | 63.58 | 46.50 | 33.74 | 58.17 | ||||||||||||
| 2002 | 37.52 | 44.00 | 44.74 | 56.53 | 62.77 | 73.93 | 86.32 | 77.16 | 73.97 | 57.97 | 51.27 | 40.45 | b | 58.89 | ||||||||||||
| 2003 | 43.16 | 41.07 | 50.48 | 49.53 | 60.38 | e | ----- | z | 87.90 | 83.10 | 77.63 | 63.74 | 42.37 | 38.61 | 58.00 | |||||||||||
| 2004 | 35.58 | 38.14 | 53.94 | 56.70 | j | 61.23 | 72.90 | 82.77 | 81.74 | 69.59 | a | 58.23 | 44.73 | 39.90 | 58.07 | |||||||||||
| 2005 | 34.42 | 43.00 | e | 50.77 | 51.67 | 60.90 | 65.40 | 83.84 | 83.00 | 68.30 | 59.00 | 43.13 | 32.13 | 56.30 | ||||||||||||
| 2006 | 37.90 | 37.68 | 40.74 | 52.83 | 65.16 | 73.27 | 86.42 | 78.94 | 74.47 | 60.19 | 43.33 | 37.32 | 57.35 | |||||||||||||
| 2007 | 36.06 | 41.64 | 51.37 | a | 55.96 | e | 67.55 | ----- | z | 87.61 | 81.26 | 71.03 | 56.16 | 47.70 | 32.58 | 57.18 | ||||||||||
| 2008 | 31.71 | 40.14 | 45.39 | 51.30 | 61.84 | 70.80 | 83.19 | 81.81 | 74.37 | 60.52 | 49.93 | 36.06 | 57.25 | |||||||||||||
| 2009 | 41.81 | 40.36 | 43.55 | 53.77 | 65.29 | 69.30 | 84.10 | 81.00 | 78.13 | 53.00 | 46.03 | 33.42 | 57.48 | |||||||||||||
| 2010 | 38.94 | 41.79 | 49.00 | 49.73 | 56.33 | d | 66.77 | 83.96 | h | 78.90 | 70.77 | 61.32 | 42.50 | 34.29 | 53.67 | |||||||||||
| 2011 | 38.32 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 38.32 | ||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 37.61 | 42.05 | 48.13 | 55.36 | 63.95 | 72.31 | 82.36 | 80.98 | 73.14 | 61.62 | 45.83 | 37.66 | 58.58 | |||||||||||||
| S.D. | 3.50 | 4.67 | 3.84 | 4.78 | 3.98 | 3.73 | 3.52 | 3.32 | 4.33 | 4.22 | 4.03 | 3.88 | 1.36 | |||||||||||||
| SKEW | -0.49 | -0.02 | 0.35 | 0.27 | -0.16 | 0.30 | -0.80 | -0.22 | -0.33 | 0.44 | 0.24 | 0.44 | -0.38 | |||||||||||||
| MAX | 44.74 | 51.39 | 55.52 | 67.10 | 73.45 | 80.37 | 88.67 | 88.00 | 80.87 | 73.13 | 54.97 | 46.94 | 61.39 | |||||||||||||
| MIN | 27.29 | 29.39 | 40.74 | 45.23 | 55.39 | 65.40 | 70.58 | 72.29 | 62.70 | 52.68 | 36.77 | 30.61 | 55.18 | |||||||||||||
| NO YRS | 51 | 51 | 49 | 48 | 51 | 49 | 51 | 51 | 52 | 52 | 52 | 51 | 41 | |||||||||||||