| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1957 | ----- | z | ----- | z | 40.72 | f | 45.98 | a | 53.87 | 62.70 | 65.32 | a | 62.65 | 60.48 | 44.65 | a | 34.70 | 34.43 | a | 51.64 | ||||||
| 1958 | 32.66 | 39.70 | 35.47 | 44.32 | 58.58 | 59.87 | 68.55 | 70.35 | 57.72 | 52.68 | 39.88 | a | 41.31 | 50.09 | ||||||||||||
| 1959 | 36.98 | 34.62 | 40.26 | 48.18 | 48.40 | 62.00 | 70.13 | 64.40 | 55.12 | 50.79 | 39.92 | 30.82 | 48.47 | |||||||||||||
| 1960 | 28.06 | 32.78 | 41.73 | 45.78 | 49.65 | 62.85 | 71.74 | 64.00 | 59.72 | 48.95 | 36.22 | 33.18 | 47.89 | |||||||||||||
| 1961 | 34.76 | 38.13 | a | 39.42 | 45.12 | 51.47 | 66.17 | 69.48 | 69.69 | 54.17 | 48.24 | 35.37 | 31.55 | 48.63 | ||||||||||||
| 1962 | 24.94 | 31.18 | 36.44 | 49.27 | 50.05 | 60.52 | 66.84 | 64.81 | 62.03 | 49.05 | 41.60 | 36.52 | 47.77 | |||||||||||||
| 1963 | 28.29 | 43.05 | 39.05 | 40.50 | 53.97 | 58.57 | 63.48 | 65.69 | 63.42 | 50.82 | 39.42 | 34.73 | 48.42 | |||||||||||||
| 1964 | 31.73 | 34.03 | 37.21 | 42.33 | 50.37 | 57.97 | 68.77 | 65.02 | 56.98 | 52.08 | 36.93 | 32.73 | 47.18 | |||||||||||||
| 1965 | 32.50 | 37.23 | 39.31 | 46.65 | 50.92 | 60.33 | 66.77 | 64.94 | 54.43 | 54.13 | 40.55 | 30.92 | 48.22 | |||||||||||||
| 1966 | 32.81 | 33.93 | 40.77 | 47.30 | 56.90 | 58.45 | 64.79 | 67.05 | 62.60 | 50.31 | 41.17 | 36.02 | 49.34 | |||||||||||||
| 1967 | 35.19 | 38.80 | 37.23 | 37.98 | 52.79 | 61.37 | 71.18 | 71.92 | 63.05 | 49.63 | 41.22 | 30.16 | 49.21 | |||||||||||||
| 1968 | 32.19 | 40.74 | 42.65 | 44.22 | 52.58 | 61.82 | 71.27 | 63.50 | 59.40 | 49.03 | 38.57 | 32.16 | 49.01 | |||||||||||||
| 1969 | 30.45 | 32.16 | 38.34 | 44.05 | 57.23 | 61.50 | 67.47 | 66.52 | 59.98 | 42.44 | 38.17 | 35.23 | 47.79 | |||||||||||||
| 1970 | 34.53 | 39.21 | 39.69 | 39.97 | 53.90 | 62.90 | 70.15 | 68.66 | 54.80 | 47.02 | 39.32 | 27.82 | 48.16 | |||||||||||||
| 1971 | 34.06 | 35.59 | 34.03 | 43.88 | 51.44 | 57.73 | 69.44 | 71.16 | 54.95 | 44.73 | 38.57 | 28.18 | 46.98 | |||||||||||||
| 1972 | 30.31 | 37.05 | 44.06 | 41.85 | 55.26 | 63.22 | 69.13 | 68.16 | 55.15 | 48.08 | 37.25 | 27.19 | 48.06 | |||||||||||||
| 1973 | 30.45 | 36.77 | 37.79 | 45.85 | 57.02 | 62.05 | 69.71 | 66.35 | 58.12 | 48.27 | 38.35 | 36.81 | 48.96 | |||||||||||||
| 1974 | 28.10 | 35.48 | 39.34 | 43.28 | 51.23 | 63.75 | l | 67.34 | b | 66.37 | 62.62 | 49.34 | 40.30 | 32.92 | 46.94 | |||||||||||
| 1975 | 33.61 | 33.29 | 36.18 | 38.67 | 52.03 | 58.73 | 69.47 | 63.44 | 62.02 | 46.73 | 35.35 | 35.39 | 47.07 | |||||||||||||
| 1976 | 35.27 | 35.47 | 35.71 | 41.57 | 54.13 | 57.80 | 68.82 | 61.37 | 61.92 | 49.45 | 41.98 | 31.37 | 47.91 | |||||||||||||
| 1977 | 25.23 | 37.88 | 36.56 | 47.03 | 46.85 | 65.08 | 67.23 | 69.82 | 57.62 | 48.47 | 39.48 | 35.92 | 48.10 | |||||||||||||
| 1978 | 37.29 | 38.55 | 45.18 | 43.45 | 49.84 | 59.85 | 68.26 | 65.45 | 55.88 | 51.79 | 34.70 | 28.31 | 48.21 | |||||||||||||
| 1979 | 24.98 | 35.46 | 42.52 | 44.18 | 55.05 | 61.60 | 69.06 | 64.85 | 62.87 | 51.97 | 35.33 | 36.44 | 48.69 | |||||||||||||
| 1980 | 31.97 | 40.36 | 38.26 | 47.63 | 53.06 | 57.00 | 69.50 | 63.71 | 60.63 | 50.65 | 40.67 | 35.10 | 49.04 | |||||||||||||
| 1981 | 34.48 | 35.48 | 41.19 | 48.15 | 52.66 | 61.35 | 67.15 | 70.15 | 60.62 | 46.74 | 40.40 | 37.09 | b | 49.62 | ||||||||||||
| 1982 | 30.35 | 35.02 | 37.92 | 41.88 | 53.77 | 62.27 | 67.08 | 67.77 | 57.63 | 48.79 | 34.12 | 30.73 | 47.28 | |||||||||||||
| 1983 | 37.00 | 39.21 | 41.53 | 42.82 | 54.85 | 59.15 | 64.84 | 68.16 | 58.57 | 52.24 | 39.72 | 30.85 | 49.08 | |||||||||||||
| 1984 | 31.77 | 36.88 | 42.48 | 43.85 | 54.00 | 58.52 | 71.05 | 69.19 | 59.35 | 45.79 | 38.10 | 28.89 | 48.32 | |||||||||||||
| 1985 | 26.26 | 32.59 | 38.11 | 50.28 | 54.50 | 64.03 | ----- | z | 66.21 | 53.80 | 47.76 | 32.05 | 31.23 | 45.17 | ||||||||||||
| 1986 | 40.63 | 40.46 | 46.00 | 46.52 | 55.11 | 66.67 | 65.58 | 71.89 | 53.83 | 50.98 | 41.43 | 32.34 | 50.95 | |||||||||||||
| 1987 | 31.44 | 37.32 | 42.18 | 52.92 | 57.24 | 64.67 | 62.47 | 67.60 | 63.42 | 54.58 | 39.47 | 32.74 | 50.50 | |||||||||||||
| 1988 | 29.29 | 39.57 | 42.79 | 50.23 | 53.60 | 63.07 | 71.53 | 68.31 | 60.03 | 57.03 | 39.35 | 31.50 | 50.53 | |||||||||||||
| 1989 | 30.85 | 26.54 | 42.37 | a | 51.20 | 53.73 | 64.80 | 69.45 | 65.52 | 59.50 | 49.23 | 40.82 | 33.61 | 48.97 | ||||||||||||
| 1990 | 36.61 | 34.23 | 42.63 | 53.17 | 52.55 | 62.65 | 72.13 | 69.06 | 64.83 | 51.13 | 41.75 | 26.65 | 50.62 | |||||||||||||
| 1991 | 33.34 | 43.16 | 38.11 | 45.20 | 50.84 | 58.63 | 71.34 | 69.50 | 63.43 | 52.15 | 41.13 | 34.10 | 50.08 | |||||||||||||
| 1992 | 34.81 | 41.10 | 44.45 | 51.68 | 61.90 | 66.52 | 68.11 | 70.34 | 61.10 | 53.24 | 38.02 | 30.21 | 51.79 | |||||||||||||
| 1993 | 25.23 | 28.75 | 44.32 | 46.03 | 57.31 | 59.25 | 61.90 | 66.21 | 61.73 | 51.19 | 34.57 | 33.95 | 47.54 | |||||||||||||
| 1994 | 36.85 | 34.38 | 44.61 | 49.88 | 57.47 | 63.13 | 73.34 | 68.74 | 62.90 | 49.58 | 33.20 | 33.06 | 50.60 | |||||||||||||
| 1995 | 36.34 | 43.27 | 39.68 | 45.33 | 54.77 | 59.80 | 68.52 | 66.35 | 63.93 | 50.06 | 45.47 | 36.15 | 50.81 | |||||||||||||
| 1996 | 35.74 | 38.07 | 42.65 | 47.93 | 52.40 | 62.63 | 72.87 | 70.39 | 58.57 | 49.53 | 41.62 | 36.94 | 50.78 | |||||||||||||
| 1997 | 35.11 | 34.62 | 44.73 | 46.03 | 59.65 | 60.70 | 68.89 | 69.73 | 61.65 | 49.37 | 41.90 | 31.84 | 50.35 | |||||||||||||
| 1998 | 38.10 | 37.09 | 41.84 | 45.27 | 49.60 | 60.55 | 72.45 | 71.23 | 64.65 | 48.13 | 39.72 | 31.37 | 50.00 | |||||||||||||
| 1999 | 34.66 | 34.36 | 39.37 | 45.23 | 52.94 | 61.00 | 68.37 | 67.50 | 60.82 | 53.15 | a | 45.45 | 34.00 | 49.74 | ||||||||||||
| 2000 | 34.61 | 39.55 | 40.66 | 50.58 | 54.97 | b | 65.08 | 67.92 | 69.21 | 58.80 | 48.29 | 33.78 | 33.92 | 49.78 | ||||||||||||
| 2001 | 33.10 | 34.86 | 43.76 | 43.90 | 58.68 | 61.63 | 68.68 | ----- | z | 63.03 | 53.02 | 40.78 | 34.18 | 48.69 | ||||||||||||
| 2002 | 34.60 | 38.89 | 39.85 | 49.33 | 54.97 | 66.12 | 72.73 | 65.97 | 61.03 | 47.26 | 39.88 | 36.03 | 50.56 | |||||||||||||
| 2003 | 39.13 | 36.20 | 44.32 | 43.33 | 54.68 | 65.98 | 74.58 | 70.10 | 64.83 | 55.61 | 37.08 | 36.37 | 51.85 | |||||||||||||
| 2004 | 35.11 | 36.98 | 47.84 | 49.92 | 54.73 | 63.97 | 72.35 | 70.18 | 59.55 | 49.19 | 38.48 | 35.71 | 51.17 | |||||||||||||
| 2005 | 33.48 | 36.57 | 43.24 | 46.75 | 54.61 | 58.45 | 72.61 | 70.82 | 59.38 | 51.34 | 37.83 | 30.52 | 49.63 | |||||||||||||
| 2006 | 37.27 | 34.91 | 37.39 | 46.80 | 57.11 | 66.58 | 74.77 | 67.94 | 61.72 | 49.03 | 41.20 | 33.24 | 50.66 | |||||||||||||
| 2007 | 30.44 | 36.73 | 46.27 | 48.37 | 57.45 | 63.82 | 74.84 | 68.95 | 58.48 | 47.45 | 40.42 | 31.24 | 50.37 | |||||||||||||
| 2008 | 29.48 | 37.76 | 38.92 | 43.17 | 55.32 | 60.98 | a | 71.10 | 70.24 | 61.72 | 51.56 | 42.55 | 30.00 | 49.40 | ||||||||||||
| 2009 | 34.40 | 36.34 | 39.02 | 45.85 | 57.37 | 61.68 | 72.23 | 68.61 | 64.05 | 47.52 | 39.25 | 29.39 | 49.64 | |||||||||||||
| 2010 | 38.97 | 37.91 | 40.84 | 43.65 | 49.13 | 60.75 | 69.98 | 67.61 | 61.38 | 51.89 | 37.57 | 35.71 | 49.62 | |||||||||||||
| 2011 | 34.39 | 32.93 | 39.66 | 42.82 | 49.34 | 59.72 | 68.10 | 69.85 | 64.90 | 50.85 | 37.02 | 30.05 | 48.30 | |||||||||||||
| 2012 | 34.63 | 34.88 | 39.82 | 48.80 | 54.66 | 59.97 | 70.21 | 70.21 | 63.93 | 51.05 | a | 41.97 | 32.32 | 50.20 | ||||||||||||
| 2013 | 26.73 | 34.64 | 42.29 | 48.50 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 32.50 | z | 34.55 | ||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 32.89 | 36.48 | 40.68 | 45.82 | 53.90 | 61.71 | 69.29 | 67.70 | 60.16 | 49.89 | 38.95 | 32.88 | 49.27 | |||||||||||||
| S.D. | 3.80 | 3.26 | 3.05 | 3.40 | 3.05 | 2.59 | 2.90 | 2.57 | 3.16 | 2.71 | 2.86 | 2.96 | 1.26 | |||||||||||||
| SKEW | -0.42 | -0.30 | 0.10 | 0.04 | 0.06 | 0.25 | -0.34 | -0.41 | -0.48 | -0.01 | -0.29 | 0.11 | 0.07 | |||||||||||||
| MAX | 40.63 | 43.27 | 47.84 | 53.17 | 61.90 | 66.67 | 74.84 | 71.92 | 64.90 | 57.03 | 45.47 | 41.31 | 51.85 | |||||||||||||
| MIN | 24.94 | 26.54 | 34.03 | 37.98 | 46.85 | 57.00 | 61.90 | 61.37 | 53.80 | 42.44 | 32.05 | 26.65 | 46.98 | |||||||||||||
| NO YRS | 56 | 56 | 56 | 56 | 56 | 55 | 55 | 55 | 56 | 56 | 56 | 56 | 52 | |||||||||||||