| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1973 | ----- | z | ----- | z | ----- | z | ----- | z | 57.13 | 64.65 | 74.87 | 72.58 | 61.05 | 50.06 | 38.85 | 34.47 | 56.71 | |||||||||
| 1974 | 26.87 | 34.82 | 39.23 | 45.90 | 51.52 | 68.90 | 72.02 | 69.77 | 63.67 | 49.00 | 39.68 | 30.29 | 49.31 | |||||||||||||
| 1975 | 27.08 | 32.29 | 36.92 | 39.35 | 52.23 | 60.08 | 74.85 | 66.94 | 63.58 | 50.00 | 36.12 | 32.82 | 47.69 | |||||||||||||
| 1976 | 29.98 | 31.60 | 34.95 | 44.23 | 56.66 | 60.28 | 72.18 | 65.87 | 63.10 | 49.73 | 40.48 | 30.11 | 48.27 | |||||||||||||
| 1977 | 19.26 | f | 35.11 | 36.89 | 52.42 | 50.39 | 68.40 | 72.11 | 73.13 | a | 61.45 | 51.23 | 38.07 | 34.61 | 52.16 | |||||||||||
| 1978 | 34.45 | 35.43 | 46.06 | 45.65 | 51.74 | 62.83 | 71.35 | 69.50 | 60.20 | 52.24 | 34.85 | 24.44 | 49.06 | |||||||||||||
| 1979 | 16.87 | 33.80 | 41.18 | 46.52 | 55.06 | 64.87 | 74.11 | 70.90 | 67.27 | 53.19 | 33.40 | 35.26 | 49.37 | |||||||||||||
| 1980 | 28.16 | 37.93 | 37.77 | 50.37 | 54.00 | 60.75 | 71.39 | 66.89 | 61.15 | 50.42 | 38.33 | 32.68 | 49.15 | |||||||||||||
| 1981 | 31.48 | 34.43 | 42.03 | 47.97 | 52.47 | 61.55 | 70.15 | 75.77 | 64.10 | 48.48 | 41.72 | 34.27 | 50.37 | |||||||||||||
| 1982 | 26.31 | 29.23 | 39.37 | 43.22 | 52.71 | 64.75 | 69.79 | 72.98 | 60.58 | 48.34 | 33.28 | 29.31 | 47.49 | |||||||||||||
| 1983 | 34.50 | 37.73 | 41.94 | 43.98 | 55.32 | 62.22 | 68.66 | 74.44 | 59.98 | 52.16 | 40.45 | 23.92 | 49.61 | |||||||||||||
| 1984 | 23.32 | 28.67 | 40.66 | 44.83 | 53.58 | 60.17 | 73.45 | 75.23 | 59.38 | 46.82 | 38.57 | 25.13 | 47.48 | |||||||||||||
| 1985 | 21.11 | 26.48 | 35.69 | 51.65 | 57.23 | 65.88 | 78.68 | 68.47 | 54.70 | 47.61 | 28.72 | 16.68 | 46.07 | |||||||||||||
| 1986 | 33.24 | 38.52 | 46.32 | 45.95 | 56.97 | 69.98 | 69.60 | 76.47 | 56.25 | 51.52 | 39.58 | 28.08 | 51.04 | |||||||||||||
| 1987 | 28.39 | 36.00 | 42.97 | 54.38 | 60.56 | 68.57 | 70.63 | 71.10 | 66.60 | 55.97 | 39.98 | 31.69 | 52.24 | |||||||||||||
| 1988 | 26.90 | 36.05 | 41.15 | 50.88 | 56.24 | 68.85 | 74.60 | 72.35 | 61.98 | 60.31 | 38.28 | 26.34 | 51.16 | |||||||||||||
| 1989 | 25.08 | 23.61 | 41.53 | 51.40 | 54.71 | 66.50 | 75.74 | 69.65 | 62.92 | 49.81 | 39.75 | 32.18 | 49.41 | |||||||||||||
| 1990 | 33.03 | 32.23 | 42.79 | 52.33 | 52.97 | 63.82 | 73.74 | 72.98 | 69.63 | 50.40 | 40.12 | 18.87 | 50.24 | |||||||||||||
| 1991 | 25.89 | 39.66 | 40.15 | 44.67 | 51.32 | 59.12 | 73.68 | 75.77 | 65.00 | 51.87 | 36.48 | 31.32 | 49.58 | |||||||||||||
| 1992 | 32.84 | 41.12 | 47.13 | 52.15 | 62.35 | 67.45 | 70.05 | 73.45 | 62.17 | 53.81 | 32.73 | 27.34 | 51.88 | |||||||||||||
| 1993 | 23.53 | 26.77 | 39.53 | 46.22 | 59.82 | 58.05 | 62.11 | 66.84 | 62.30 | 51.65 | 31.73 | 32.58 | 46.76 | |||||||||||||
| 1994 | 31.68 | 32.96 | 44.10 | 49.75 | 57.34 | 64.28 | 74.35 | 73.98 | 65.48 | 49.31 | 30.30 | 29.81 | 50.28 | |||||||||||||
| 1995 | 34.44 | 40.09 | 40.48 | 44.73 | 52.66 | 59.75 | 69.00 | 67.79 | 63.38 | 47.76 | 43.43 | 31.47 | 49.58 | |||||||||||||
| 1996 | 30.71 | 32.52 | 41.79 | 46.72 | 51.48 | 61.75 | 72.29 | 70.48 | 58.73 | 50.32 | 39.90 | 34.32 | 49.25 | |||||||||||||
| 1997 | 30.37 | 34.70 | 42.85 | 45.20 | 58.65 | 60.88 | 67.79 | 71.82 | 64.80 | 49.65 | 40.83 | 29.34 | 49.74 | |||||||||||||
| 1998 | 36.77 | 36.59 | 41.06 | 46.10 | 51.97 | 58.33 | 73.52 | 72.60 | 66.82 | 49.06 | 40.78 | 28.44 | 50.17 | |||||||||||||
| 1999 | 33.79 | 34.05 | 41.10 | 43.88 | 51.10 | 61.00 | 70.00 | 72.26 | 61.28 | 53.12 | a | 46.35 | 29.53 | 49.79 | ||||||||||||
| 2000 | 32.32 | 39.53 | 40.44 | 50.95 | 54.98 | 63.05 | 72.39 | 72.35 | 59.57 | 50.16 | 31.15 | 28.55 | 49.62 | |||||||||||||
| 2001 | 25.32 | 31.91 | 43.76 | 45.47 | 57.63 | a | 62.37 | 71.24 | 76.03 | 66.47 | 52.27 | 42.43 | 28.69 | 50.30 | ||||||||||||
| 2002 | 29.90 | 31.88 | 38.18 | 47.53 | 54.98 | a | 64.73 | 76.16 | 68.03 | 63.08 | 47.66 | 39.67 | 36.26 | 49.84 | ||||||||||||
| 2003 | 38.08 | 35.09 | 44.16 | 45.62 | 54.66 | 63.72 | 77.16 | 74.39 | 64.67 | 56.53 | 35.55 | 35.58 | 52.10 | |||||||||||||
| 2004 | 26.15 | 32.09 | 46.06 | 49.88 | 54.16 | 64.45 | 73.27 | 71.06 | 60.75 | 51.97 | 36.75 | 33.95 | 50.05 | |||||||||||||
| 2005 | 30.71 | 35.11 | 43.60 | 47.08 | 54.81 | 59.33 | 73.81 | 73.34 | 61.42 | 51.89 | 36.25 | 27.94 | 49.61 | |||||||||||||
| 2006 | 34.45 | 32.86 | 39.06 | 48.40 | 56.69 | 65.87 | 76.97 | 70.39 | 62.72 | 49.05 | 41.08 | 30.10 | 50.64 | |||||||||||||
| 2007 | 27.61 | 37.23 | 45.74 | 47.50 | 57.11 | 65.22 | 79.08 | 71.56 | 61.18 | 48.84 | 39.12 | 29.66 | 50.82 | |||||||||||||
| 2008 | 25.47 | 33.09 | 37.79 | 42.70 | 55.16 | 61.43 | 72.84 | 71.55 | 62.37 | 50.27 | 41.45 | 29.45 | 48.63 | |||||||||||||
| 2009 | 28.77 | 34.05 | 37.23 | 46.93 | 56.40 | 62.22 | 73.15 | 71.26 | 67.18 | 45.42 | 38.17 | 24.26 | 48.75 | |||||||||||||
| 2010 | 34.55 | 36.36 | 41.68 | 44.68 | 48.71 | 60.27 | 69.63 | 68.69 | 63.80 | 53.52 | 35.32 | 31.73 | 49.08 | |||||||||||||
| 2011 | 28.48 | 31.80 | 39.40 | a | 41.77 | 50.32 | 58.00 | 69.74 | 73.32 | 66.67 | 50.63 | 36.16 | b | 28.93 | a | 47.94 | ||||||||||
| 2012 | 32.98 | 34.26 | 43.26 | 49.63 | 53.20 | a | 61.25 | 75.92 | 74.02 | 65.20 | 49.65 | 41.57 | 32.34 | 51.11 | ||||||||||||
| 2013 | 19.66 | 32.77 | 41.71 | 51.50 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 31.38 | ||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 29.26 | 34.01 | 41.19 | 47.14 | 54.68 | 63.14 | 72.55 | 71.65 | 62.82 | 50.79 | 37.94 | 29.82 | 49.56 | |||||||||||||
| S.D. | 4.74 | 3.73 | 2.99 | 3.35 | 2.99 | 3.26 | 3.21 | 2.76 | 3.05 | 2.76 | 3.79 | 4.22 | 1.38 | |||||||||||||
| SKEW | -0.47 | -0.52 | 0.00 | 0.15 | 0.35 | 0.37 | -0.50 | -0.29 | -0.25 | 1.12 | -0.50 | -1.07 | -0.31 | |||||||||||||
| MAX | 38.08 | 41.12 | 47.13 | 54.38 | 62.35 | 69.98 | 79.08 | 76.47 | 69.63 | 60.31 | 46.35 | 36.26 | 52.24 | |||||||||||||
| MIN | 16.87 | 23.61 | 34.95 | 39.35 | 48.71 | 58.00 | 62.11 | 65.87 | 54.70 | 45.42 | 28.72 | 16.68 | 46.07 | |||||||||||||
| NO YRS | 39 | 40 | 40 | 39 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 38 | |||||||||||||