| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1959 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 77.60 | 83.16 | 75.10 | 68.10 | 60.77 | 48.50 | 38.65 | 64.55 | ||||||||
| 1960 | 29.68 | 34.21 | 47.55 | 56.23 | 65.29 | 78.10 | 83.03 | 80.65 | 72.43 | 55.03 | 44.43 | 37.90 | 57.04 | |||||||||||||
| 1961 | 40.48 | 40.96 | 42.58 | 53.90 | 63.71 | 78.10 | 80.00 | 73.71 | 64.23 | 57.52 | 42.33 | 32.55 | 55.84 | |||||||||||||
| 1962 | 36.06 | 37.18 | 38.48 | 59.07 | 60.55 | 72.57 | 77.94 | 79.74 | 72.40 | 60.71 | 49.53 | 42.68 | 57.24 | |||||||||||||
| 1963 | 35.03 | 45.14 | 42.06 | 49.73 | 67.65 | 71.07 | 82.26 | 73.81 | 71.43 | 63.39 | 45.90 | 39.58 | 57.25 | |||||||||||||
| 1964 | 34.00 | 33.86 | 37.84 | 50.10 | 61.06 | 71.30 | 82.00 | 76.87 | 70.37 | 65.81 | 41.37 | 36.03 | 55.05 | |||||||||||||
| 1965 | 37.06 | 38.21 | 40.26 | 49.10 | 58.00 | 68.27 | 76.94 | 76.55 | 65.20 | 65.23 | 46.60 | 36.29 | 54.81 | |||||||||||||
| 1966 | 32.90 | 32.71 | 47.58 | 58.20 | 68.00 | 74.40 | 80.06 | 80.00 | 70.40 | 59.32 | 48.00 | 35.45 | 57.25 | |||||||||||||
| 1967 | 36.74 | 41.36 | 48.39 | 47.93 | 60.87 | 68.23 | 79.87 | 78.39 | 68.83 | 64.19 | 50.13 | 30.48 | 56.29 | |||||||||||||
| 1968 | 35.35 | 41.41 | 46.35 | 48.03 | 60.58 | 74.77 | 75.42 | 69.23 | 69.30 | 58.90 | 44.00 | 32.84 | 54.68 | |||||||||||||
| 1969 | 38.29 | 32.54 | 38.65 | 54.57 | 68.45 | 69.17 | 78.94 | 78.29 | 71.70 | 51.39 | 45.47 | 39.23 | 55.56 | |||||||||||||
| 1970 | 37.32 | 43.68 | 42.42 | 48.43 | 66.42 | 73.50 | 77.71 | 77.06 | 68.17 | 56.16 | 48.03 | 34.77 | 56.14 | |||||||||||||
| 1971 | 37.03 | 37.75 | 45.94 | 54.47 | 59.39 | 74.30 | 81.90 | 77.06 | 68.53 | 53.74 | 40.17 | 30.61 | 55.07 | |||||||||||||
| 1972 | 36.77 | 42.21 | a | 54.77 | 56.73 | 66.45 | 72.57 | 82.68 | 78.16 | 67.40 | 53.13 | 36.93 | ----- | z | 58.89 | |||||||||||
| 1973 | 30.35 | 35.75 | ----- | z | 47.67 | 64.65 | 73.50 | 80.10 | 77.87 | 70.40 | 61.74 | 45.37 | 40.39 | 57.07 | ||||||||||||
| 1974 | 32.83 | a | 37.59 | a | 50.10 | 52.61 | b | 69.10 | a | 80.13 | 79.29 | 78.13 | 72.83 | 59.13 | 45.23 | d | 33.17 | b | 57.51 | |||||||
| 1975 | 39.07 | c | 35.86 | 40.00 | b | 43.37 | 59.19 | 71.48 | a | 78.97 | 76.81 | 69.90 | 59.35 | 45.10 | a | 41.79 | c | 55.07 | ||||||||
| 1976 | 39.03 | a | 42.69 | 42.16 | 51.53 | 65.00 | 74.43 | 81.58 | 76.61 | 68.27 | 58.61 | 51.03 | a | 43.35 | 57.86 | |||||||||||
| 1977 | 36.43 | a | 44.68 | 43.77 | 59.27 | 58.90 | 76.70 | 79.94 | 80.10 | 73.10 | 63.77 | 49.34 | a | 44.48 | 59.21 | |||||||||||
| 1978 | 35.61 | 37.61 | 47.52 | 53.43 | 61.94 | 76.07 | 82.13 | 79.19 | 68.87 | 64.10 | 42.28 | a | 32.55 | 56.77 | ||||||||||||
| 1979 | 28.90 | 36.25 | 41.74 | 52.07 | 63.45 | 74.97 | 81.90 | 76.19 | 75.60 | 64.77 | 39.40 | 42.58 | 56.49 | |||||||||||||
| 1980 | 39.10 | 41.34 | 40.55 | 53.61 | b | 58.93 | a | 75.53 | 81.03 | a | 77.19 | 70.77 | 59.26 | 49.63 | 49.35 | 58.03 | ||||||||||
| 1981 | 44.71 | 44.93 | 44.81 | 59.50 | 62.26 | 78.93 | 80.74 | 77.35 | 70.47 | 54.10 | 47.76 | a | 43.00 | 59.05 | ||||||||||||
| 1982 | 38.87 | 39.39 | 42.90 | 52.73 | 61.39 | 71.90 | 77.94 | 75.13 | 67.20 | 54.32 | 41.73 | 35.23 | 54.89 | |||||||||||||
| 1983 | 38.16 | 40.25 | 41.65 | 45.73 | 62.35 | 72.20 | 77.55 | 75.42 | 72.20 | 60.71 | 41.73 | 36.81 | 55.40 | |||||||||||||
| 1984 | 37.32 | 40.41 | 44.68 | 52.43 | 70.81 | 72.23 | 78.45 | 75.77 | 72.50 | 51.61 | 43.83 | 36.13 | 56.35 | |||||||||||||
| 1985 | 34.23 | 36.46 | 43.52 | 58.77 | 64.97 | 76.37 | 78.94 | 79.42 | 65.70 | 58.42 | 41.31 | a | 38.87 | a | 56.41 | |||||||||||
| 1986 | 44.23 | 40.68 | 49.90 | a | 52.57 | 64.84 | 76.50 | 76.58 | 76.90 | 62.17 | 52.84 | 44.83 | 36.00 | 56.50 | ||||||||||||
| 1987 | 32.13 | 35.93 | 39.77 | 56.97 | 60.90 | 75.67 | 76.03 | 73.77 | 69.87 | 61.87 | 40.43 | 31.61 | 54.58 | |||||||||||||
| 1988 | 33.68 | 41.97 | 42.35 | 52.67 | 61.35 | 74.30 | 80.97 | 76.03 | 68.37 | 64.48 | 44.47 | 35.55 | 56.35 | |||||||||||||
| 1989 | 31.68 | 33.36 | 50.77 | 60.57 | 63.29 | n | 72.90 | 83.14 | j | 75.42 | 69.97 | 58.03 | 48.37 | 40.65 | 54.17 | |||||||||||
| 1990 | 35.71 | 34.25 | 45.29 | 54.83 | 61.48 | 76.17 | 79.35 | 75.68 | 69.83 | 58.48 | 45.67 | 28.94 | 55.47 | |||||||||||||
| 1991 | 32.48 | 42.75 | 37.13 | 49.20 | 59.16 | 70.53 | 78.61 | 76.29 | 70.00 | 61.06 | 41.07 | 33.65 | 54.33 | |||||||||||||
| 1992 | 33.77 | 37.83 | 43.42 | 59.47 | 63.74 | 71.57 | 74.55 | 75.68 | 69.70 | 61.13 | 38.90 | 29.42 | 54.93 | |||||||||||||
| 1993 | 31.84 | 33.43 | 43.77 | 52.33 | 63.52 | 69.60 | 78.23 | 74.84 | 69.77 | 55.87 | 40.30 | 35.48 | 54.08 | |||||||||||||
| 1994 | 38.55 | 32.86 | 47.84 | 53.23 | 62.39 | 78.07 | 81.84 | 79.55 | 70.47 | 53.90 | 36.63 | 34.06 | 55.78 | |||||||||||||
| 1995 | 31.19 | 46.32 | 43.42 | 49.07 | 55.94 | 66.47 | 77.97 | 79.06 | 71.87 | 60.71 | 52.07 | 39.77 | 56.15 | |||||||||||||
| 1996 | ----- | z | 42.93 | 45.97 | 55.33 | 67.97 | 78.37 | 81.58 | 80.23 | 67.50 | 55.84 | 43.33 | 35.00 | 59.46 | ||||||||||||
| 1997 | 33.71 | 35.82 | 49.84 | 48.43 | 66.10 | 72.10 | 78.13 | 74.32 | 66.67 | 55.84 | 44.57 | 33.23 | 54.90 | |||||||||||||
| 1998 | 37.77 | 31.82 | 42.74 | 46.70 | 60.48 | 68.67 | 80.00 | 78.03 | 66.63 | 53.61 | 44.47 | 37.19 | 54.01 | |||||||||||||
| 1999 | 39.94 | 40.79 | 50.26 | 45.27 | 59.39 | 71.97 | 76.87 | 73.06 | 66.40 | 64.38 | b | 51.73 | 38.42 | 56.54 | ||||||||||||
| 2000 | 38.68 | 38.62 | 43.71 | 59.33 | 68.87 | ----- | z | 81.10 | 79.23 | 72.87 | 54.23 | 34.43 | 39.65 | 55.52 | ||||||||||||
| 2001 | 32.00 | 34.75 | 42.77 | 50.27 | 66.97 | 75.17 | 77.00 | 76.45 | 72.30 | 62.55 | 44.53 | 31.03 | 55.48 | |||||||||||||
| 2002 | 34.52 | 38.36 | 42.39 | 58.03 | 64.68 | 79.57 | 82.97 | 80.19 | 66.53 | 53.77 | 44.57 | 33.42 | 56.58 | |||||||||||||
| 2003 | 43.00 | 35.57 | 42.52 | 49.67 | 63.29 | 74.77 | 84.58 | 76.68 | 71.63 | 63.74 | 37.93 | 34.58 | 56.50 | |||||||||||||
| 2004 | 33.29 | 30.38 | 49.68 | ----- | z | 64.97 | 74.33 | 78.03 | 76.48 | 68.37 | 50.77 | 37.67 | 34.77 | 54.43 | ||||||||||||
| 2005 | 34.84 | 36.13 | e | 40.71 | 49.30 | 61.90 | 67.67 | 82.42 | 72.90 | 68.70 | 57.23 | 47.03 | 36.29 | 54.59 | ||||||||||||
| 2006 | 34.16 | 39.32 | 37.16 | 53.00 | 66.19 | 77.37 | 79.84 | 75.90 | 63.60 | 52.71 | 46.77 | 36.35 | e | 55.20 | ||||||||||||
| 2007 | 31.00 | e | 38.96 | 49.36 | i | 53.80 | 63.39 | h | 77.10 | 82.13 | 77.84 | l | 68.43 | 56.23 | 54.00 | o | ----- | z | 58.24 | |||||||
| 2008 | ----- | z | ----- | z | 46.58 | e | 52.50 | 56.67 | v | ----- | z | 79.32 | l | 79.06 | 70.67 | 59.42 | 48.63 | 36.10 | 56.14 | |||||||
| 2009 | 40.03 | 39.18 | 46.52 | 51.57 | 67.61 | 67.43 | 80.71 | 77.65 | 72.70 | 53.48 | 49.60 | 34.65 | 56.76 | |||||||||||||
| 2010 | 35.90 | 37.43 | 42.03 | 50.63 | 57.81 | 74.80 | 79.32 | 74.71 | 73.70 | 56.77 | 43.37 | 40.61 | 55.59 | |||||||||||||
| 2011 | 37.68 | 35.86 | 44.55 | 51.57 | 57.42 | 73.03 | 76.94 | 79.03 | 69.67 | 58.81 | 43.67 | 36.71 | 55.41 | |||||||||||||
| 2012 | 42.23 | 38.62 | 48.06 | 56.07 | a | 66.23 | 78.97 | 77.42 | 77.10 | 70.10 | 60.48 | 50.27 | 36.71 | 58.52 | ||||||||||||
| 2013 | 33.97 | 37.25 | 44.21 | q | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 35.61 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 35.95 | 38.22 | 44.22 | 52.72 | 63.25 | 73.87 | 79.68 | 76.87 | 69.53 | 58.40 | 44.54 | 36.63 | 56.08 | |||||||||||||
| S.D. | 3.62 | 3.77 | 3.89 | 4.16 | 3.54 | 3.43 | 2.26 | 2.26 | 2.67 | 4.12 | 4.17 | 4.12 | 1.27 | |||||||||||||
| SKEW | 0.34 | 0.12 | 0.34 | 0.04 | 0.06 | -0.24 | -0.09 | -0.66 | -0.43 | 0.01 | -0.27 | 0.57 | 0.59 | |||||||||||||
| MAX | 44.71 | 46.32 | 54.77 | 60.57 | 70.81 | 80.13 | 84.58 | 80.65 | 75.60 | 65.81 | 52.07 | 49.35 | 59.21 | |||||||||||||
| MIN | 28.90 | 30.38 | 37.13 | 43.37 | 55.94 | 66.47 | 74.55 | 69.23 | 62.17 | 50.77 | 34.43 | 28.94 | 54.01 | |||||||||||||
| NO YRS | 52 | 53 | 51 | 52 | 50 | 52 | 52 | 53 | 54 | 54 | 53 | 52 | 45 | |||||||||||||