| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1965 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 58.03 | 49.25 | 40.27 | 49.19 | ||||
| 1966 | 41.13 | 41.68 | 45.12 | a | 51.83 | 56.24 | ----- | z | 65.85 | 68.30 | a | 63.82 | 53.97 | 46.58 | 43.92 | 52.59 | ||||||||||
| 1967 | 42.74 | 44.05 | 45.15 | 46.72 | 56.40 | 65.13 | 69.05 | a | 73.08 | 66.70 | 55.53 | 47.65 | d | 39.97 | 54.35 | |||||||||||
| 1968 | 42.40 | a | 47.74 | 49.24 | 48.33 | 54.75 | c | 61.97 | 67.84 | 66.50 | 62.48 | 54.16 | 48.57 | a | 42.24 | 53.85 | ||||||||||
| 1969 | 39.37 | 41.18 | 47.16 | 49.72 | 59.45 | 64.28 | 65.69 | 65.42 | 63.88 | 52.52 | a | 47.27 | 44.23 | 53.35 | ||||||||||||
| 1970 | 44.22 | a | 46.14 | 47.45 | 46.83 | 55.22 | a | 64.75 | 68.35 | 67.31 | 59.55 | b | 53.37 | a | 48.39 | b | 41.53 | 53.59 | ||||||||
| 1971 | 39.87 | 44.00 | 44.55 | 48.97 | a | 55.23 | a | 60.12 | 67.85 | 69.77 | a | 59.74 | a | 51.75 | a | 44.45 | b | 39.58 | 52.16 | |||||||
| 1972 | 40.36 | c | 44.90 | c | 49.54 | e | 47.27 | f | 57.31 | 62.80 | 70.48 | 70.37 | 60.67 | 51.40 | 49.07 | 36.18 | 53.92 | |||||||||
| 1973 | 40.73 | 47.17 | a | 45.76 | 52.23 | 58.02 | 63.43 | 69.59 | c | 67.48 | c | 64.59 | c | 54.00 | 45.12 | 46.00 | 54.51 | |||||||||
| 1974 | 38.37 | 42.15 | d | 46.90 | 50.57 | 55.31 | 63.43 | 68.24 | 70.35 | 68.30 | 55.11 | 48.32 | 43.63 | 54.22 | ||||||||||||
| 1975 | 43.35 | 44.09 | 44.42 | 46.38 | 56.45 | a | 61.80 | 69.24 | 66.00 | 66.22 | 54.48 | 44.42 | 42.68 | 53.29 | ||||||||||||
| 1976 | 43.48 | a | 42.98 | 44.84 | 48.55 | 56.76 | 59.47 | 68.24 | 67.55 | i | 64.87 | 56.48 | 50.33 | 38.33 | a | 52.21 | ||||||||||
| 1977 | 39.69 | 48.02 | 46.06 | 53.17 | 54.80 | c | 65.72 | 68.61 | c | 74.19 | 62.47 | 55.77 | 46.07 | a | 45.77 | 55.03 | ||||||||||
| 1978 | 46.74 | 47.29 | 51.97 | 50.50 | c | 56.82 | 65.87 | c | ----- | z | ----- | z | 61.93 | 57.89 | 41.88 | 38.73 | 51.96 | |||||||||
| 1979 | 36.03 | 44.16 | 50.76 | 52.58 | 58.98 | 64.18 | 71.05 | 68.80 | i | 67.67 | 59.63 | ----- | z | 45.35 | 55.04 | |||||||||||
| 1980 | 40.07 | h | 48.24 | 47.70 | a | 52.40 | 58.10 | a | 60.52 | 69.92 | 66.55 | 63.97 | 56.78 | a | 49.68 | 45.21 | 56.28 | |||||||||
| 1981 | 45.84 | 47.55 | 49.06 | 52.58 | 56.79 | 63.35 | 68.02 | 71.53 | a | 64.86 | a | 53.32 | 48.15 | 45.47 | 55.54 | |||||||||||
| 1982 | 40.39 | 44.12 | 46.53 | 49.05 | 57.66 | 64.97 | 67.26 | 69.27 | 63.00 | 55.21 | 44.63 | 41.52 | b | 53.63 | ||||||||||||
| 1983 | 43.74 | 46.57 | 50.53 | 50.70 | 58.63 | 61.55 | 64.68 | 68.35 | 60.35 | 55.48 | 48.95 | 40.90 | 54.20 | |||||||||||||
| 1984 | 42.66 | 44.76 | 50.56 | 50.10 | 56.23 | 60.73 | 69.08 | 68.56 | 63.10 | 52.82 | 45.43 | 39.66 | 53.64 | |||||||||||||
| 1985 | 39.13 | 41.64 | 44.42 | 54.50 | 57.56 | 65.12 | 72.92 | 67.66 | 59.90 | 53.63 | 40.58 | 36.19 | 52.77 | |||||||||||||
| 1986 | 45.15 | a | 46.39 | 51.81 | 50.80 | 56.63 | 66.97 | 66.29 | 73.21 | 60.53 | 56.73 | 48.41 | b | 41.74 | 55.39 | |||||||||||
| 1987 | 40.81 | 44.34 | 48.45 | 56.15 | 60.37 | 66.15 | 66.90 | 69.76 | 64.78 | 59.24 | 48.93 | 40.84 | 55.56 | |||||||||||||
| 1988 | 41.85 | a | 45.39 | a | 47.71 | 53.15 | 55.23 | 62.02 | 70.37 | 69.40 | 64.77 | 59.82 | 47.77 | 40.76 | 54.85 | |||||||||||
| 1989 | 41.47 | 35.86 | 46.87 | 56.15 | 56.63 | 64.60 | 65.90 | 66.74 | 64.68 | 55.23 | 48.38 | 41.56 | 53.67 | |||||||||||||
| 1990 | 44.21 | 42.48 | 50.39 | 55.82 | 57.53 | 63.25 | 72.45 | 71.77 | 67.28 | 54.94 | 47.12 | 35.23 | 55.21 | |||||||||||||
| 1991 | 38.98 | 50.75 | 46.37 | 51.15 | 54.97 | 61.55 | 72.35 | 71.39 | 68.60 | 58.42 | 50.93 | 43.11 | 55.72 | |||||||||||||
| 1992 | 45.31 | 50.12 | 52.82 | 56.52 | 64.16 | 68.03 | 70.97 | 71.98 | 65.73 | 57.61 | 48.87 | 40.98 | 57.76 | |||||||||||||
| 1993 | 39.61 | 42.07 | 53.40 | 52.00 | 60.10 | 62.40 | 65.24 | 68.50 | 66.32 | 58.56 | 42.33 | 40.77 | 54.28 | |||||||||||||
| 1994 | 44.39 | 43.02 | 50.89 | 54.82 | 60.94 | 62.97 | 72.50 | 69.31 | 66.95 | 55.03 | 42.75 | 44.24 | 55.65 | |||||||||||||
| 1995 | 44.06 | 51.27 | 49.35 | 51.22 | 59.77 | 64.08 | 71.76 | 68.37 | 68.65 | 56.02 | 52.28 | 46.47 | 56.94 | |||||||||||||
| 1996 | 44.26 | 46.19 | 50.02 | 54.50 | 56.98 | 63.82 | 74.65 | 72.48 | 63.30 | 56.69 | 49.57 | 44.52 | 56.41 | |||||||||||||
| 1997 | 44.05 | 46.30 | 49.66 | 53.15 | 63.76 | 64.30 | 70.40 | 72.23 | a | 66.22 | 55.13 | 50.68 | 41.60 | 56.46 | ||||||||||||
| 1998 | 46.63 | 46.57 | 49.32 | 52.98 | 55.63 | 64.77 | 73.27 | 72.66 | 68.22 | 55.48 | 49.40 | 40.69 | 56.30 | |||||||||||||
| 1999 | 44.52 | d | 44.71 | 46.74 | 51.65 | 55.65 | 63.07 | c | 69.77 | 70.81 | 66.93 | 56.58 | a | 52.40 | 42.22 | a | 55.42 | |||||||||
| 2000 | 42.31 | 47.64 | 47.03 | 54.84 | a | 59.90 | 67.98 | 69.68 | 70.06 | 65.63 | 56.87 | d | 43.75 | 43.64 | c | 55.78 | ||||||||||
| 2001 | 42.72 | a | 43.07 | a | 49.65 | d | 50.28 | c | 61.72 | b | 62.50 | d | 70.41 | b | 70.74 | b | 66.83 | a | 56.21 | 50.21 | d | 42.52 | b | 55.57 | ||
| 2002 | 43.03 | 46.43 | 46.10 | 53.92 | ----- | z | 65.73 | 73.48 | 71.02 | 66.58 | 54.10 | 47.52 | 46.58 | 55.86 | ||||||||||||
| 2003 | 48.26 | 45.18 | 51.21 | 50.88 | 60.26 | 69.64 | e | 74.05 | 73.73 | 68.67 | 58.97 | 46.60 | 44.35 | 57.65 | ||||||||||||
| 2004 | 44.94 | 45.67 | 52.76 | 56.07 | 61.05 | 66.42 | 73.76 | 73.61 | 64.48 | 56.65 | 47.32 | 44.98 | 57.31 | |||||||||||||
| 2005 | 43.52 | 46.02 | 52.24 | 53.84 | k | 60.60 | 62.92 | 72.53 | 74.03 | 63.17 | 57.77 | 46.02 | 43.39 | 56.56 | ||||||||||||
| 2006 | 45.18 | 44.34 | 45.71 | 53.35 | 60.95 | 67.17 | 73.13 | 70.50 | 64.75 | n | 55.47 | ----- | z | 43.50 | 55.93 | |||||||||||
| 2007 | ----- | z | 45.98 | 51.71 | 52.47 | 59.71 | 64.65 | 73.03 | 70.37 | 64.50 | 53.39 | 45.18 | 42.32 | 56.66 | ||||||||||||
| 2008 | 38.71 | 44.76 | 46.47 | 49.28 | 60.42 | 62.72 | 72.76 | 71.77 | 66.17 | 55.95 | 51.23 | 40.71 | 55.08 | |||||||||||||
| 2009 | 40.69 | 44.88 | 46.32 | 51.82 | 61.03 | 67.05 | 75.05 | 72.02 | 67.35 | 54.90 | 46.75 | 38.87 | 55.56 | |||||||||||||
| 2010 | 49.08 | 48.95 | 48.69 | 50.63 | 55.87 | 62.93 | 72.00 | 70.89 | 66.30 | 56.95 | 47.88 | 45.10 | 56.27 | |||||||||||||
| 2011 | 44.42 | 42.64 | 47.68 | a | 49.60 | 55.29 | 63.40 | 67.97 | 72.10 | 69.62 | a | 57.05 | 47.55 | b | 40.03 | 54.78 | ||||||||||
| 2012 | 43.66 | 44.52 | 46.11 | 54.82 | 58.65 | 63.17 | 69.89 | 73.10 | 67.50 | 57.89 | 51.05 | 43.23 | 56.13 | |||||||||||||
| 2013 | 39.66 | 45.16 | 49.83 | b | 57.50 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 39.00 | z | 44.88 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 42.65 | 45.19 | 48.40 | 51.86 | 58.05 | 63.99 | 70.06 | 70.30 | 64.95 | 55.81 | 47.52 | 42.11 | 55.08 | |||||||||||||
| S.D. | 2.75 | 2.71 | 2.52 | 2.61 | 2.43 | 2.19 | 2.73 | 2.34 | 2.65 | 2.03 | 2.71 | 2.70 | 1.35 | |||||||||||||
| SKEW | 0.00 | -0.44 | 0.20 | -0.11 | 0.56 | 0.31 | -0.08 | -0.28 | -0.41 | -0.02 | -0.51 | -0.48 | 0.05 | |||||||||||||
| MAX | 49.08 | 51.27 | 53.40 | 56.52 | 64.16 | 69.64 | 75.05 | 74.19 | 69.62 | 59.82 | 52.40 | 46.58 | 57.76 | |||||||||||||
| MIN | 36.03 | 35.86 | 44.42 | 46.38 | 54.75 | 59.47 | 64.68 | 65.42 | 59.55 | 51.40 | 40.58 | 35.23 | 52.16 | |||||||||||||
| NO YRS | 46 | 48 | 48 | 45 | 46 | 46 | 46 | 44 | 46 | 48 | 46 | 48 | 37 | |||||||||||||