| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1965 | ----- | z | 41.28 | c | 45.23 | 49.33 | 50.73 | 56.97 | 64.42 | 63.74 | 55.62 | 54.35 | 46.45 | 37.15 | 51.39 | |||||||||||
| 1966 | 38.40 | 40.27 | 42.31 | 48.98 | 52.73 | 56.70 | 60.79 | 61.15 | 58.72 | 48.90 | 44.28 | 40.48 | 49.48 | |||||||||||||
| 1967 | 40.98 | 40.98 | 40.47 | 43.82 | 52.29 | 60.53 | 62.98 | 66.77 | 60.73 | 50.29 | 44.13 | 35.95 | 50.00 | |||||||||||||
| 1968 | 36.55 | 46.84 | 46.74 | 45.25 | 52.82 | 57.98 | 63.52 | 60.55 | 58.15 | 49.11 | 43.75 | 34.66 | 49.66 | |||||||||||||
| 1969 | 25.34 | l | 38.11 | 44.50 | 47.73 | 55.52 | 62.65 | 61.26 | 59.74 | 58.78 | 49.58 | 45.53 | 40.18 | 51.23 | ||||||||||||
| 1970 | 37.65 | 45.57 | 43.29 | 44.23 | 52.37 | 61.67 | 63.44 | 62.98 | 55.73 | 50.00 | 44.30 | 36.65 | 49.82 | |||||||||||||
| 1971 | 37.47 | 41.54 | 39.55 | 45.60 | 53.44 | 54.98 | 63.82 | 65.53 | 56.03 | 47.92 | 41.85 | 36.95 | 48.72 | |||||||||||||
| 1972 | 35.40 | 39.81 | 46.05 | 44.37 | 55.06 | 58.02 | 65.27 | 65.00 | 55.60 | 49.94 | 45.30 | 33.53 | 49.45 | |||||||||||||
| 1973 | 35.56 | 42.41 | 43.55 | 47.93 | 55.00 | 58.12 | 63.74 | 59.53 | 58.67 | 49.44 | 39.90 | 41.32 | 49.60 | |||||||||||||
| 1974 | 34.06 | 39.59 | 42.76 | 46.68 | 50.68 | 58.67 | 61.24 | 63.34 | 62.33 | 51.77 | 44.63 | 41.34 | 49.76 | |||||||||||||
| 1975 | 38.21 | 37.93 | 41.24 | 42.75 | 52.50 | 57.05 | 63.89 | 58.90 | 61.53 | 50.02 | 41.05 | 40.24 | 48.78 | |||||||||||||
| 1976 | 40.05 | 39.10 | 40.60 | 46.28 | 52.92 | 55.28 | 60.76 | 60.53 | 59.03 | 50.65 | 46.27 | 38.71 | 49.18 | |||||||||||||
| 1977 | 34.39 | 42.38 | 40.50 | 48.60 | 49.15 | 59.67 | 61.31 | 66.84 | 55.45 | 50.02 | 40.30 | 39.23 | 48.98 | |||||||||||||
| 1978 | 37.56 | 41.21 | 45.40 | 46.50 | 50.16 | 59.50 | 62.37 | 61.21 | 55.67 | 52.44 | 38.78 | 35.24 | 48.84 | |||||||||||||
| 1979 | 28.65 | 37.43 | 46.55 | 47.98 | 53.63 | 59.95 | i | 62.89 | 61.35 | 60.23 | 52.44 | 40.65 | 40.10 | 48.35 | ||||||||||||
| 1980 | 31.67 | a | 38.52 | 41.44 | 48.40 | a | 51.03 | 53.98 | 61.55 | 59.95 | 58.08 | 51.61 | 44.43 | 41.21 | 48.49 | |||||||||||
| 1981 | 42.77 | 41.04 | 45.81 | 47.30 | 52.60 | a | 54.77 | 58.95 | 62.55 | 57.15 | 47.65 | 44.70 | 39.13 | 49.53 | ||||||||||||
| 1982 | 36.53 | 39.95 | 43.52 | 44.77 | 53.58 | 61.45 | 62.00 | 62.97 | 58.52 | 51.40 | 41.78 | 39.11 | 49.63 | |||||||||||||
| 1983 | 42.26 | 44.11 | 47.58 | 48.30 | 55.76 | 56.78 | 60.21 | 62.45 | 56.17 | 50.68 | 45.45 | 32.56 | 50.19 | |||||||||||||
| 1984 | 39.58 | 43.12 | 47.44 | 46.45 | 51.89 | 55.70 | 62.18 | 63.03 | 57.92 | 48.68 | 43.25 | 35.85 | 49.59 | |||||||||||||
| 1985 | 34.97 | 36.34 | 41.50 | 49.33 | 52.66 | 58.65 | 66.79 | 61.16 | 55.20 | 49.50 | 34.67 | 31.37 | 47.68 | |||||||||||||
| 1986 | 40.84 | 41.23 | 48.94 | 46.53 | 53.35 | 61.20 | 59.52 | 66.87 | 56.22 | 53.18 | 44.80 | 37.66 | 50.86 | |||||||||||||
| 1987 | 37.13 | 43.29 | 45.26 | 50.25 | 55.47 | 59.87 | 61.18 | 62.79 | 59.63 | 55.11 | 47.27 | 35.48 | 51.06 | |||||||||||||
| 1988 | 36.63 | 41.78 | 44.35 | 49.32 | 52.55 | 57.28 | 61.39 | 60.76 | 56.83 | 54.08 | 44.67 | 40.15 | 49.98 | |||||||||||||
| 1989 | 40.26 | 32.50 | 42.71 | 52.12 | 53.63 | 59.02 | 58.85 | 59.84 | 58.82 | 47.92 | 42.83 | 37.03 | 48.79 | |||||||||||||
| 1990 | 39.02 | 36.89 | 45.11 | 49.27 | 50.61 | 57.53 | 63.39 | 62.34 | 57.22 | 44.03 | 42.30 | 32.73 | 48.37 | |||||||||||||
| 1991 | 36.73 | 46.75 | 42.13 | 47.08 | 50.26 | 54.75 | 63.82 | 63.45 | 59.65 | 49.95 | 42.42 | 38.44 | 49.62 | |||||||||||||
| 1992 | 40.34 | 45.10 | 49.79 | 51.98 | 57.97 | 63.45 | 65.87 | 65.16 | 57.02 | 52.35 | 43.10 | 35.32 | 52.29 | |||||||||||||
| 1993 | 32.48 | 36.57 | 44.55 | 48.35 | 57.08 | 57.88 | 58.98 | 63.85 | 61.10 | 54.87 | 36.77 | 39.13 | 49.30 | |||||||||||||
| 1994 | 41.10 | 36.91 | 47.05 | 48.74 | m | 55.79 | 57.35 | 65.44 | 64.11 | 60.88 | 49.11 | 37.48 | 37.92 | 50.29 | ||||||||||||
| 1995 | 39.69 | 43.16 | 44.35 | 47.37 | 55.32 | 58.15 | 65.29 | ----- | z | 61.73 | 51.16 | 48.92 | 39.55 | 50.43 | ||||||||||||
| 1996 | 39.24 | 38.86 | 45.73 | 49.95 | 52.26 | 58.00 | 66.87 | 64.52 | 56.00 | 49.73 | 41.20 | 36.06 | 49.87 | |||||||||||||
| 1997 | 34.53 | 39.48 | 41.68 | 44.90 | 56.24 | 56.82 | 60.98 | 62.98 | 58.77 | 47.19 | 46.88 | 38.85 | 49.11 | |||||||||||||
| 1998 | 39.71 | 44.11 | a | 46.31 | 49.27 | 53.16 | 60.02 | 66.68 | 65.44 | 62.10 | 51.39 | 45.33 | 37.15 | 51.72 | ||||||||||||
| 1999 | 40.44 | 41.00 | 43.74 | 47.80 | 51.97 | 57.47 | 61.81 | 64.06 | 60.00 | 52.60 | 46.80 | 41.69 | 50.78 | |||||||||||||
| 2000 | 37.58 | 41.52 | 42.35 | 50.27 | 53.76 | 60.70 | 62.56 | 62.53 | 59.70 | 52.32 | 39.65 | 38.31 | 50.10 | |||||||||||||
| 2001 | 38.16 | 40.38 | 46.05 | 47.53 | 56.11 | 58.22 | 64.05 | 65.22 | a | 60.63 | 50.76 | 45.90 | 39.34 | 51.03 | ||||||||||||
| 2002 | 38.58 | 41.57 | 41.82 | 48.63 | 52.65 | 61.48 | 67.00 | 64.66 | 60.00 | 51.89 | 46.23 | 41.35 | 51.32 | |||||||||||||
| 2003 | 43.65 | 43.12 | 45.79 | 48.65 | 54.94 | 63.32 | 67.45 | 66.34 | 62.23 | 54.89 | 41.40 | 39.87 | 52.64 | |||||||||||||
| 2004 | 35.53 | 42.57 | 48.11 | 51.85 | 55.39 | 61.57 | 68.06 | 67.61 | 58.55 | 53.21 | 43.70 | 40.94 | 52.26 | |||||||||||||
| 2005 | 39.81 | 42.61 | 48.16 | 49.43 | 58.16 | 58.55 | 66.89 | 66.37 | 57.22 | 52.94 | 42.63 | 37.08 | 51.65 | |||||||||||||
| 2006 | 42.65 | 39.43 | 43.68 | 50.03 | ----- | z | 62.40 | 66.95 | 64.03 | 60.48 | 49.44 | 42.93 | 37.31 | 50.85 | ||||||||||||
| 2007 | 35.85 | 41.29 | 45.98 | 48.27 | 54.74 | 59.38 | 66.84 | 63.39 | 57.18 | 48.18 | 41.67 | 36.98 | 49.98 | |||||||||||||
| 2008 | 34.53 | 40.16 | 40.21 | 44.02 | 53.56 | 57.13 | 63.77 | 64.21 | 58.45 | 48.56 | 44.80 | 33.29 | 48.56 | |||||||||||||
| 2009 | 36.05 | 37.82 | 39.98 | 46.00 | 53.84 | 59.78 | 66.53 | ----- | z | 58.15 | ----- | z | 41.07 | ----- | z | 48.80 | ||||||||||
| 2010 | 42.85 | 44.23 | 46.21 | b | 47.78 | 51.02 | 56.72 | 63.94 | 64.45 | 59.78 | 52.85 | 42.30 | 40.08 | 51.02 | ||||||||||||
| 2011 | 39.44 | 37.91 | 41.69 | 44.92 | 50.71 | 57.12 | b | 61.02 | 64.24 | 62.40 | 52.15 | a | 42.29 | a | 37.65 | 49.29 | ||||||||||
| 2012 | 38.12 | a | 41.47 | 40.71 | 48.73 | 53.37 | 56.63 | 63.87 | a | 66.85 | 62.09 | a | 53.37 | 46.83 | 40.33 | a | 51.03 | |||||||||
| 2013 | 35.79 | 42.52 | 45.82 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 41.38 | ||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 37.86 | 40.85 | 44.17 | 47.68 | 53.41 | 58.53 | 63.38 | 63.38 | 58.71 | 50.84 | 43.20 | 37.89 | 49.95 | |||||||||||||
| S.D. | 3.10 | 2.84 | 2.61 | 2.20 | 2.09 | 2.34 | 2.51 | 2.25 | 2.14 | 2.30 | 2.89 | 2.60 | 1.16 | |||||||||||||
| SKEW | -0.46 | -0.24 | 0.05 | -0.15 | 0.24 | 0.28 | 0.07 | -0.11 | 0.07 | -0.28 | -0.67 | -0.62 | 0.56 | |||||||||||||
| MAX | 43.65 | 46.84 | 49.79 | 52.12 | 58.16 | 63.45 | 68.06 | 67.61 | 62.40 | 55.11 | 48.92 | 41.69 | 52.64 | |||||||||||||
| MIN | 28.65 | 32.50 | 39.55 | 42.75 | 49.15 | 53.98 | 58.85 | 58.90 | 55.20 | 44.03 | 34.67 | 31.37 | 47.68 | |||||||||||||
| NO YRS | 47 | 49 | 49 | 47 | 47 | 47 | 48 | 46 | 48 | 47 | 48 | 47 | 41 | |||||||||||||