| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1965 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 65.46 | q | 72.87 | 70.90 | 59.35 | 55.85 | 44.37 | 31.89 | 55.87 | |||||||
| 1966 | 27.42 | 27.14 | 41.40 | p | 49.02 | 61.31 | 66.83 | a | 75.26 | d | 72.87 | 63.78 | 49.58 | 40.92 | 30.86 | f | 53.41 | |||||||||
| 1967 | 28.53 | 33.89 | 43.20 | c | 45.48 | a | 57.23 | c | 63.34 | b | 75.29 | b | 73.29 | b | 64.14 | a | 54.52 | c | 43.20 | 24.20 | d | 50.53 | ||||
| 1968 | 26.67 | g | 36.35 | b | 42.60 | k | 42.17 | a | 55.92 | m | 70.21 | d | 74.18 | 66.97 | b | 63.57 | i | 54.88 | c | 37.97 | 24.56 | 50.91 | ||||
| 1969 | 31.26 | 34.14 | 34.44 | 49.85 | 61.65 | 65.58 | 74.90 | 74.53 | a | 66.47 | 45.71 | 40.02 | 33.31 | 50.99 | ||||||||||||
| 1970 | 30.55 | a | 38.17 | a | 34.00 | 41.65 | 59.29 | 68.87 | 76.27 | 74.39 | d | 61.12 | 48.85 | d | 39.53 | 31.48 | 50.35 | |||||||||
| 1971 | 31.71 | 33.00 | 39.40 | 48.20 | 55.23 | 69.63 | 77.39 | 73.18 | a | 61.43 | 47.87 | 36.63 | 26.98 | 50.06 | ||||||||||||
| 1972 | 30.79 | 37.33 | 47.92 | 50.02 | 59.45 | 68.63 | 76.40 | 72.08 | 63.13 | 49.97 | 33.93 | 26.29 | 51.33 | |||||||||||||
| 1973 | 22.58 | 32.04 | 35.23 | 44.35 | 57.87 | 67.10 | 74.27 | 72.45 | 63.17 | 53.87 | 41.48 | 31.34 | 49.65 | |||||||||||||
| 1974 | 24.21 | 30.21 | 44.42 | 47.78 | 62.84 | 74.20 | 74.23 | 71.44 | 64.70 | 53.82 | 38.97 | 28.02 | 51.24 | |||||||||||||
| 1975 | 27.39 | 31.20 | 36.65 | 41.82 | 54.16 | 65.12 | 73.03 | 71.29 | 63.68 | 52.95 | 38.43 | a | 29.89 | 48.80 | ||||||||||||
| 1976 | 29.35 | 38.95 | 37.65 | 48.65 | 59.50 | 67.95 | 75.82 | 71.18 | 63.30 | 49.23 | 39.68 | 32.81 | 51.17 | |||||||||||||
| 1977 | 26.77 | 36.07 | 36.19 | 50.98 | 53.77 | 70.85 | 74.32 | 72.79 | 65.85 | 54.29 | 42.47 | 36.32 | 51.72 | |||||||||||||
| 1978 | 31.16 | 32.23 | ----- | z | 48.13 | 55.39 | 69.37 | 74.79 | 71.93 | a | 63.83 | 56.34 | 39.72 | 23.48 | 51.49 | |||||||||||
| 1979 | 22.34 | 29.96 | 38.44 | 48.83 | 57.18 | 67.72 | 76.08 | 70.69 | 68.50 | 56.47 | 33.32 | 30.73 | 50.02 | |||||||||||||
| 1980 | 31.40 | 36.34 | 36.60 | 47.82 | 54.39 | 69.20 | 76.35 | 71.95 | 65.52 | b | 51.19 | 41.73 | 39.16 | 51.81 | ||||||||||||
| 1981 | 36.97 | 36.91 | 38.69 | 53.17 | 56.63 | 71.13 | 74.81 | 71.31 | 64.12 | 49.26 | 42.88 | 33.71 | 52.47 | |||||||||||||
| 1982 | 29.21 | b | 31.20 | 39.60 | b | 46.45 | 56.79 | 66.27 | 72.50 | 71.61 | 63.93 | 46.77 | 36.18 | 30.76 | 49.27 | |||||||||||
| 1983 | 31.10 | 34.86 | 38.23 | 40.98 | 54.16 | 63.53 | 70.34 | 71.13 | 64.80 | 50.42 | 37.98 | 29.95 | 48.96 | |||||||||||||
| 1984 | 26.63 | 30.95 | 38.48 | 42.93 | a | 61.24 | 65.03 | 73.03 | 70.50 | 64.50 | 44.95 | a | 38.60 | a | 30.43 | a | 48.94 | |||||||||
| 1985 | 28.31 | 28.25 | 38.26 | 49.98 | 58.21 | b | 69.90 | 74.65 | 72.94 | 57.09 | b | 50.82 | c | 37.32 | 32.71 | 49.87 | ||||||||||
| 1986 | 36.31 | 36.82 | 44.79 | 47.28 | 56.53 | 68.55 | 70.55 | 72.53 | 58.17 | 48.23 | 39.00 | 31.42 | 50.85 | |||||||||||||
| 1987 | 27.08 | 33.12 | 36.16 | 50.88 | 57.18 | 69.75 | 70.84 | 68.89 | 63.68 | 55.18 | 37.55 | 27.79 | 49.84 | |||||||||||||
| 1988 | 25.42 | 34.38 | 38.21 | 47.40 | 57.06 | 69.43 | 74.84 | 71.21 | 61.00 | 57.60 | 38.37 | 29.15 | 50.34 | |||||||||||||
| 1989 | 23.66 | 30.62 | 45.35 | 54.13 | 59.47 | 67.60 | 75.11 | 69.23 | 64.58 | 51.29 | 41.23 | 31.45 | 51.14 | |||||||||||||
| 1990 | 28.38 | b | 32.96 | 42.56 | 50.78 | 56.47 | 71.32 | 73.60 | 71.32 | 65.55 | 51.39 | 38.05 | 22.50 | 50.41 | ||||||||||||
| 1991 | 24.27 | 36.30 | 36.16 | 44.88 | 55.23 | 65.77 | 73.02 | 72.05 | 64.17 | 54.84 | 37.15 | 26.68 | 49.21 | |||||||||||||
| 1992 | 24.98 | 34.60 | 42.08 | 54.17 | 58.53 | 66.35 | q | 70.58 | 71.26 | 64.32 | 54.89 | 33.68 | 24.32 | 48.49 | ||||||||||||
| 1993 | 29.82 | a | 32.12 | 41.74 | 47.93 | 58.37 | 65.25 | 71.58 | 69.23 | 62.60 | 49.08 | 34.73 | 28.58 | 49.25 | ||||||||||||
| 1994 | 31.92 | 30.32 | 44.44 | 49.02 | 59.94 | 73.28 | 76.00 | 74.60 | 65.68 | 49.53 | 33.27 | 31.82 | 51.65 | |||||||||||||
| 1995 | 29.62 | b | 41.77 | 41.48 | 45.17 | 51.05 | 62.95 | 72.56 | 74.08 | 64.43 | 52.03 | 43.80 | b | 34.08 | 51.09 | |||||||||||
| 1996 | 30.68 | 37.81 | 41.21 | 48.90 | 60.94 | 70.38 | 76.92 | 73.85 | 61.08 | 51.19 | 41.02 | 33.37 | 52.28 | |||||||||||||
| 1997 | 30.89 | 33.59 | 44.58 | 43.93 | 60.16 | 67.17 | 72.08 | 70.73 | 64.87 | 49.95 | 39.62 | 29.44 | 50.58 | |||||||||||||
| 1998 | 32.92 | 31.48 | 40.98 | 44.80 | 56.84 | 63.23 | 74.73 | 73.65 | 65.67 | 49.85 | 39.15 | 31.90 | 50.43 | |||||||||||||
| 1999 | 34.50 | 37.52 | 45.48 | 42.97 | 55.89 | 66.05 | 72.55 | 68.87 | 62.03 | 54.87 | 45.62 | 30.90 | 51.44 | |||||||||||||
| 2000 | 33.29 | 36.59 | 39.32 | 52.45 | 62.27 | 70.43 | 74.61 | 75.00 | 64.80 | 50.81 | 31.38 | 32.57 | a | 51.96 | ||||||||||||
| 2001 | 28.42 | a | 33.46 | 41.52 | 48.47 | 60.71 | 69.72 | 73.90 | 71.26 | 68.08 | 55.48 | 42.12 | a | 27.92 | 51.75 | |||||||||||
| 2002 | 28.58 | 32.04 | 38.32 | 52.92 | 58.94 | 72.32 | 76.76 | 72.56 | 62.70 | 49.05 | 38.82 | 30.65 | 51.14 | |||||||||||||
| 2003 | 36.69 | 33.39 | 39.58 | 46.77 | 60.92 | 69.52 | 78.82 | 73.40 | 64.48 | 57.06 | 36.42 | 31.94 | 52.42 | |||||||||||||
| 2004 | 27.89 | 29.19 | 47.55 | 47.50 | 58.84 | 68.83 | 73.35 | 70.44 | 61.90 | 49.15 | 36.58 | 30.44 | 50.14 | |||||||||||||
| 2005 | 34.34 | 35.11 | 40.26 | 47.10 | 57.81 | 64.82 | 76.92 | 68.56 | 63.45 | 52.19 | 41.02 | 31.19 | 51.06 | |||||||||||||
| 2006 | 31.55 | 33.79 | 38.10 | 49.85 | 61.90 | 72.10 | 76.26 | 71.11 | 58.62 | 48.74 | 40.90 | 30.44 | 51.11 | |||||||||||||
| 2007 | 26.65 | 34.79 | 43.78 | b | 48.77 | 58.71 | 69.65 | 76.60 | 72.94 | 63.76 | g | 51.29 | 44.72 | 26.74 | 50.42 | |||||||||||
| 2008 | 23.13 | ----- | z | 39.76 | 45.03 | 53.26 | 65.03 | 74.61 | 70.40 | 63.33 | 50.89 | 43.12 | 27.56 | 50.56 | ||||||||||||
| 2009 | 31.89 | 35.16 | 40.63 | 44.30 | ----- | z | 64.10 | 74.41 | h | 72.03 | 64.38 | 47.08 | 41.23 | 22.76 | 46.36 | |||||||||||
| 2010 | 26.89 | 29.29 | 37.84 | 46.88 | 52.55 | 68.15 | 74.27 | 68.61 | 66.45 | 52.52 | 38.02 | 33.42 | l | 51.04 | ||||||||||||
| 2011 | 25.93 | d | 30.12 | 41.97 | b | 46.54 | d | 52.25 | a | 67.62 | 73.84 | 74.39 | 65.64 | a | 51.07 | d | 37.93 | b | 28.50 | h | 51.57 | |||||
| 2012 | 33.29 | 31.14 | 41.50 | a | 50.86 | a | 62.76 | b | 72.85 | 74.35 | a | 74.60 | 64.64 | b | 52.48 | 43.28 | 27.48 | 52.44 | ||||||||
| 2013 | 23.76 | 25.91 | 35.71 | b | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 28.46 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 29.16 | 33.46 | 40.19 | 47.62 | 57.80 | 68.18 | 74.38 | 71.80 | 63.67 | 51.57 | 39.23 | 29.80 | 50.73 | |||||||||||||
| S.D. | 3.73 | 3.28 | 3.44 | 3.30 | 2.97 | 2.84 | 1.92 | 1.84 | 2.33 | 3.08 | 3.24 | 3.51 | 1.04 | |||||||||||||
| SKEW | 0.11 | 0.03 | 0.33 | -0.05 | -0.26 | -0.04 | -0.26 | -0.32 | -0.78 | 0.07 | -0.26 | -0.10 | -0.17 | |||||||||||||
| MAX | 36.97 | 41.77 | 47.92 | 54.17 | 62.84 | 74.20 | 78.82 | 75.00 | 68.50 | 57.60 | 45.62 | 39.16 | 52.47 | |||||||||||||
| MIN | 22.34 | 25.91 | 34.00 | 40.98 | 51.05 | 62.95 | 70.34 | 66.97 | 57.09 | 44.95 | 31.38 | 22.50 | 48.80 | |||||||||||||
| NO YRS | 47 | 47 | 45 | 47 | 45 | 46 | 47 | 48 | 46 | 48 | 48 | 45 | 38 | |||||||||||||