| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1977 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 55.02 | 47.52 | 37.77 | 36.42 | 44.18 | |||||
| 1978 | 33.26 | 37.38 | 44.52 | 46.42 | 50.19 | 60.73 | 64.71 | 62.98 | 55.08 | 48.91 | c | 34.02 | 30.08 | 47.36 | ||||||||||||
| 1979 | 22.32 | 32.61 | 41.40 | 45.35 | 53.10 | 59.22 | 63.31 | 62.84 | 59.12 | 50.69 | 37.10 | 36.32 | 46.95 | |||||||||||||
| 1980 | 25.86 | b | 33.41 | 37.98 | 47.32 | 51.37 | 54.68 | 62.90 | 58.92 | 56.65 | 48.12 | a | 41.41 | a | 36.58 | a | 46.27 | |||||||||
| 1981 | 37.05 | 36.67 | b | 42.98 | 45.52 | 51.89 | 55.22 | 62.22 | a | 66.52 | a | 57.90 | 46.21 | 41.38 | 35.78 | a | 48.28 | |||||||||
| 1982 | 33.18 | 34.00 | 40.03 | 42.45 | 51.10 | 61.42 | ----- | z | 63.45 | 56.33 | 46.08 | 36.13 | 33.44 | 45.24 | ||||||||||||
| 1983 | 35.08 | 37.46 | 43.65 | 46.40 | 54.42 | 56.03 | 59.68 | 63.53 | ----- | z | 46.65 | 41.35 | 24.74 | 46.27 | ||||||||||||
| 1984 | 31.44 | 35.88 | 42.40 | 43.48 | 48.79 | 55.13 | 62.77 | 63.34 | 54.97 | 45.26 | 37.27 | 29.89 | 45.88 | |||||||||||||
| 1985 | 28.58 | 32.09 | 38.39 | 46.12 | 51.85 | 57.32 | 67.21 | 60.50 | 52.52 | 45.94 | 29.45 | 23.48 | 44.45 | |||||||||||||
| 1986 | 34.02 | 34.48 | 42.34 | 44.43 | 52.56 | 62.27 | 59.02 | 67.39 | 54.98 | 50.56 | 41.83 | 32.55 | 48.04 | |||||||||||||
| 1987 | 30.94 | 37.18 | 41.66 | 50.25 | 55.42 | 61.58 | 62.61 | 63.92 | 60.90 | 51.82 | 42.55 | 31.48 | 49.19 | |||||||||||||
| 1988 | 32.05 | 37.24 | 41.71 | ----- | z | 52.32 | 57.67 | 63.89 | 62.82 | 57.82 | 53.68 | 41.03 | 33.48 | 48.52 | ||||||||||||
| 1989 | 34.68 | 26.95 | 37.47 | 48.60 | 52.44 | 60.30 | 60.50 | 61.74 | 58.57 | 48.50 | 42.10 | 35.34 | 47.26 | |||||||||||||
| 1990 | 36.81 | 32.50 | 40.97 | 49.98 | 51.34 | 58.13 | 66.98 | 65.63 | 61.83 | 46.21 | 41.90 | 28.00 | 48.36 | |||||||||||||
| 1991 | 31.40 | 41.45 | 39.71 | 45.00 | 49.66 | 54.70 | 64.77 | 66.60 | 60.18 | 49.00 | 40.43 | 35.76 | 48.22 | |||||||||||||
| 1992 | 36.55 | 41.76 | 47.47 | 49.35 | 57.19 | 63.43 | 65.37 | 65.15 | 55.53 | 49.61 | 39.28 | 31.05 | 50.15 | |||||||||||||
| 1993 | 26.85 | 31.16 | 38.53 | 44.37 | 56.55 | 57.43 | 58.23 | 62.56 | 59.18 | 51.50 | 33.65 | 32.68 | 46.06 | |||||||||||||
| 1994 | 37.74 | 33.43 | 42.95 | 48.55 | 54.77 | 56.83 | 65.84 | 63.66 | 60.45 | 47.26 | 34.98 | 33.31 | 48.31 | |||||||||||||
| 1995 | 32.63 | 39.84 | 41.42 | 44.78 | 54.85 | 57.83 | 64.68 | 60.55 | 61.28 | 47.74 | 44.17 | 33.84 | 48.63 | |||||||||||||
| 1996 | 33.79 | 30.91 | 39.71 | 47.42 | 49.48 | 57.98 | 66.82 | 64.29 | 55.40 | 47.74 | 38.70 | 32.45 | 47.06 | |||||||||||||
| 1997 | 32.26 | 35.27 | 38.69 | 43.60 | 55.71 | 57.37 | 62.90 | 66.23 | 59.20 | 47.92 | 41.62 | 33.95 | 47.89 | |||||||||||||
| 1998 | 33.44 | 38.25 | 42.08 | 46.33 | 52.26 | 59.53 | 68.69 | 66.06 | 61.83 | 47.32 | 42.57 | 31.53 | 49.16 | |||||||||||||
| 1999 | 36.34 | 35.80 | 39.40 | 44.72 | 48.90 | 56.07 | 62.63 | 66.00 | 57.78 | 47.81 | 43.52 | 36.21 | 47.93 | |||||||||||||
| 2000 | 33.26 | 34.74 | 38.29 | 48.20 | 52.53 | 58.63 | 62.32 | 62.73 | 57.52 | a | 48.08 | 35.02 | 31.90 | a | 46.93 | |||||||||||
| 2001 | 32.97 | 34.23 | 40.87 | 44.08 | 54.16 | 55.87 | 62.19 | 64.60 | 59.82 | 47.39 | 41.85 | 34.34 | 47.70 | |||||||||||||
| 2002 | 33.82 | 36.00 | 37.82 | 44.85 | 50.69 | 59.70 | 65.24 | 62.84 | 58.62 | 46.81 | 39.37 | 35.69 | 47.62 | |||||||||||||
| 2003 | 38.16 | 38.07 | 42.48 | 45.97 | 52.71 | 60.67 | 67.06 | 65.61 | 61.00 | 52.42 | 36.35 | 33.92 | 49.54 | |||||||||||||
| 2004 | 30.35 | 35.62 | 44.06 | 49.40 | 53.06 | 59.92 | 67.37 | 67.31 | 57.43 | 50.19 | 39.77 | 35.89 | 49.20 | |||||||||||||
| 2005 | 32.50 | 36.16 | 44.94 | 46.67 | 55.03 | 56.38 | ----- | z | 65.61 | 56.20 | 49.94 | 37.63 | 29.47 | 46.41 | ||||||||||||
| 2006 | 36.82 | 33.96 | 39.76 | 46.93 | ----- | z | 61.08 | 67.35 | 64.18 | 59.22 | 48.61 | i | 38.90 | e | 32.16 | 48.04 | ||||||||||
| 2007 | 30.84 | 36.48 | 41.94 | 45.90 | 53.48 | 58.35 | 67.48 | 63.10 | 56.98 | 45.45 | 38.48 | 33.27 | 47.65 | |||||||||||||
| 2008 | 29.97 | 36.31 | 37.52 | 40.85 | 52.42 | 55.83 | 64.65 | 64.35 | 57.82 | 47.35 | 42.20 | 29.84 | 46.59 | |||||||||||||
| 2009 | 31.11 | 33.55 | 36.18 | 43.98 | 53.73 | 61.35 | 68.27 | 66.24 | 60.90 | 43.88 | w | 39.12 | 28.58 | 47.55 | ||||||||||||
| 2010 | 35.27 | 39.84 | 41.26 | 44.38 | 49.60 | 55.87 | 64.19 | 63.42 | 57.55 | 48.82 | 38.12 | 33.21 | 47.63 | |||||||||||||
| 2011 | 31.81 | 33.07 | 37.16 | 40.57 | 47.65 | 55.42 | 59.96 | e | 64.67 | h | 61.03 | 48.45 | j | 37.68 | 31.84 | 43.62 | ||||||||||
| 2012 | 33.35 | 35.66 | 36.63 | 45.63 | 50.58 | 52.81 | v | 63.60 | u | 67.15 | a | 60.88 | 48.24 | 41.17 | 35.35 | 45.46 | ||||||||||
| 2013 | 29.58 | 17.55 | 34.47 | k | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 23.57 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 32.67 | 34.92 | 40.70 | 45.82 | 52.41 | 58.23 | 64.12 | 64.17 | 58.21 | 48.39 | 39.16 | 32.61 | 47.72 | |||||||||||||
| S.D. | 3.38 | 4.21 | 2.63 | 2.35 | 2.32 | 2.42 | 2.80 | 2.05 | 2.37 | 2.06 | 3.19 | 3.13 | 1.24 | |||||||||||||
| SKEW | -0.82 | -1.91 | 0.31 | -0.10 | 0.04 | 0.30 | -0.29 | -0.42 | -0.29 | 0.73 | -0.87 | -1.04 | -0.40 | |||||||||||||
| MAX | 38.16 | 41.76 | 47.47 | 50.25 | 57.19 | 63.43 | 68.69 | 67.39 | 61.83 | 53.68 | 44.17 | 36.58 | 50.15 | |||||||||||||
| MIN | 22.32 | 17.55 | 36.18 | 40.57 | 47.65 | 54.68 | 58.23 | 58.92 | 52.52 | 45.26 | 29.45 | 23.48 | 44.45 | |||||||||||||
| NO YRS | 36 | 36 | 35 | 34 | 34 | 34 | 32 | 34 | 35 | 33 | 36 | 36 | 27 | |||||||||||||