| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1967 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 61.65 | u | 65.56 | 59.65 | 50.48 | 43.78 | 37.95 | 51.49 | ||||||
| 1968 | 37.87 | 43.93 | a | 45.66 | 45.08 | 52.24 | 56.62 | 61.98 | 59.19 | 57.47 | 48.44 | 43.40 | 35.50 | 48.95 | ||||||||||||
| 1969 | 30.58 | 37.00 | 42.74 | 46.15 | 54.23 | 62.17 | 59.45 | 58.03 | 56.83 | 48.26 | 44.42 | 40.05 | 48.33 | |||||||||||||
| 1970 | 38.11 | 43.12 | 43.23 | 43.15 | 51.16 | 58.97 | 61.13 | 60.84 | 54.05 | 48.40 | 42.78 | 37.61 | 48.55 | |||||||||||||
| 1971 | 36.77 | 39.79 | 38.95 | 45.30 | 52.63 | 53.57 | 62.72 | a | 64.66 | 54.05 | 48.21 | 42.42 | 36.18 | a | 47.94 | |||||||||||
| 1972 | 35.81 | 39.59 | 44.66 | 43.13 | 54.06 | 57.42 | 63.79 | 62.63 | 54.08 | 48.32 | 42.93 | 31.87 | 48.19 | |||||||||||||
| 1973 | 35.10 | 41.76 | a | 42.56 | 47.62 | 52.21 | c | 57.30 | 61.35 | 58.24 | 57.95 | 49.10 | 40.00 | 41.57 | a | 48.73 | ||||||||||
| 1974 | 33.65 | 39.36 | 42.23 | 45.80 | 48.84 | 56.59 | a | 59.45 | 62.66 | 60.92 | 50.18 | 43.88 | 39.97 | 48.63 | ||||||||||||
| 1975 | 38.24 | 37.34 | 40.15 | 42.17 | 51.27 | 55.38 | 61.66 | 58.32 | 57.98 | 48.82 | 41.20 | 39.61 | 47.68 | |||||||||||||
| 1976 | 39.50 | 38.66 | 40.61 | 44.98 | 52.10 | 54.68 | 59.61 | 60.16 | 58.92 | 50.60 | 44.70 | 37.76 | 48.52 | |||||||||||||
| 1977 | 34.87 | 42.25 | 41.02 | 49.20 | 48.95 | 58.40 | 59.87 | 65.31 | 56.42 | 49.60 | 39.92 | 40.35 | 48.85 | |||||||||||||
| 1978 | 39.73 | 43.73 | 46.94 | 48.50 | 50.97 | 60.33 | a | 62.87 | 61.73 | 57.43 | 51.26 | 36.10 | 33.11 | 49.39 | ||||||||||||
| 1979 | 28.79 | 37.70 | 45.16 | 47.37 | 53.60 | 57.38 | 62.68 | 61.44 | 59.35 | 52.77 | 41.72 | 42.15 | 49.17 | |||||||||||||
| 1980 | 32.69 | 41.34 | d | 43.00 | 49.48 | 51.81 | 54.20 | 61.58 | 59.29 | 56.95 | 50.50 | 43.90 | 39.84 | 48.72 | ||||||||||||
| 1981 | 40.24 | 41.82 | 45.10 | 46.80 | 50.84 | 55.37 | 60.06 | 65.29 | 57.59 | b | 49.05 | 44.13 | 38.98 | 49.61 | ||||||||||||
| 1982 | 34.27 | 38.68 | 42.55 | 44.52 | 51.48 | 59.13 | 60.52 | 61.55 | 58.35 | 50.71 | 40.50 | a | 37.85 | 48.34 | ||||||||||||
| 1983 | 40.55 | 43.84 | 46.48 | 47.88 | 55.44 | 56.32 | 60.40 | 62.02 | 55.50 | 49.69 | 44.92 | 32.44 | 49.62 | |||||||||||||
| 1984 | 39.48 | 42.43 | 47.82 | 45.90 | 50.32 | 56.60 | 61.37 | 61.10 | 57.15 | 48.06 | 42.37 | 34.63 | 48.94 | |||||||||||||
| 1985 | 34.82 | 37.12 | 41.63 | 49.22 | 52.27 | 57.75 | 64.98 | 61.16 | 54.65 | 48.11 | 33.70 | 32.50 | 47.33 | |||||||||||||
| 1986 | 40.11 | 40.89 | 47.82 | 46.33 | 52.23 | 60.35 | 59.15 | 65.58 | 56.02 | 53.18 | 44.20 | 38.37 | 50.35 | |||||||||||||
| 1987 | 37.66 | 41.61 | 44.11 | 48.53 | 54.13 | 57.80 | 59.48 | 61.21 | 58.38 | 50.65 | 43.92 | 34.82 | 49.36 | |||||||||||||
| 1988 | 36.63 | 41.28 | 42.37 | ----- | z | 50.08 | 54.83 | 59.97 | 59.87 | 56.07 | 53.92 | 42.35 | 37.23 | 48.60 | ||||||||||||
| 1989 | 38.10 | 31.04 | 41.26 | 49.42 | 51.42 | 57.85 | 57.87 | 61.00 | 58.35 | 49.13 | 43.97 | 39.15 | 48.21 | |||||||||||||
| 1990 | 39.16 | 34.88 | 45.55 | 49.80 | 51.24 | 57.43 | 64.48 | 63.27 | 62.17 | 47.48 | 43.13 | 31.32 | 49.16 | |||||||||||||
| 1991 | 35.82 | 45.93 | 41.02 | 46.18 | 49.37 | 54.38 | 62.52 | 62.61 | 58.65 | 49.10 | 43.37 | 39.06 | 49.00 | |||||||||||||
| 1992 | 39.69 | 45.34 | 48.06 | 50.22 | 55.19 | 59.28 | 63.06 | 62.34 | 55.70 | 50.39 | 42.40 | 35.79 | 50.62 | |||||||||||||
| 1993 | 32.16 | 35.68 | 44.74 | 46.80 | 56.19 | 56.30 | 57.71 | 61.34 | 58.02 | 52.47 | 37.07 | 37.08 | 47.96 | |||||||||||||
| 1994 | 41.05 | 36.50 | 45.27 | 48.85 | 52.76 | 54.80 | 62.05 | 60.58 | 59.67 | 47.15 | 37.90 | 38.00 | 48.71 | |||||||||||||
| 1995 | 39.76 | 42.68 | 42.90 | 45.95 | 53.95 | 56.65 | 62.45 | 58.71 | 61.18 | 49.42 | 45.75 | 38.61 | 49.83 | |||||||||||||
| 1996 | 38.77 | 37.79 | 43.53 | 48.78 | 49.44 | 55.55 | 63.06 | 61.84 | 54.82 | 48.23 | 41.92 | 37.92 | 48.47 | |||||||||||||
| 1997 | 37.53 | 39.70 | 42.60 | 45.98 | 55.06 | 55.85 | 60.10 | 63.56 | 59.58 | 49.03 | 44.63 | 37.10 | 49.23 | |||||||||||||
| 1998 | 39.32 | 42.21 | 44.39 | 46.32 | 51.37 | 58.12 | 64.87 | 61.79 | 59.12 | 49.15 | 44.13 | 36.21 | 49.75 | |||||||||||||
| 1999 | 38.66 | 39.05 | 41.34 | 44.07 | 48.40 | 55.23 | 59.26 | 62.11 | 55.23 | 48.27 | 45.53 | 39.98 | 48.10 | |||||||||||||
| 2000 | 36.23 | 39.78 | 41.16 | 48.58 | 51.85 | 58.17 | 59.26 | 58.66 | 55.97 | 47.95 | 38.08 | 37.92 | 47.80 | |||||||||||||
| 2001 | 37.82 | 37.23 | 43.40 | 44.37 | 52.40 | 53.73 | 58.71 | 62.18 | 57.38 | 47.27 | 44.20 | 37.60 | 48.03 | |||||||||||||
| 2002 | 38.16 | 39.46 | 40.15 | 46.95 | 49.15 | 57.27 | 62.77 | 60.74 | 55.97 | 46.60 | 42.27 | 39.10 | 48.21 | |||||||||||||
| 2003 | 41.71 | 39.46 | 45.16 | 45.77 | 51.19 | 58.37 | 61.76 | 61.63 | 58.73 | 52.94 | 38.95 | 38.29 | 49.50 | |||||||||||||
| 2004 | 35.98 | 40.79 | 45.11 | 49.23 | 52.56 | 58.37 | 63.79 | 64.24 | 55.95 | 51.26 | 41.68 | 39.52 | 49.87 | |||||||||||||
| 2005 | 39.00 | 38.89 | 45.27 | 47.27 | 54.58 | 55.62 | 60.84 | 62.08 | 54.12 | 51.06 | 40.17 | 36.82 | 48.81 | |||||||||||||
| 2006 | 41.29 | 36.27 | 41.05 | 46.38 | 52.31 | 57.10 | 61.81 | 58.74 | 57.52 | 48.52 | 42.38 | 38.34 | b | 48.48 | ||||||||||||
| 2007 | 35.26 | 41.23 | 45.06 | 46.48 | 52.06 | 55.38 | 62.84 | 60.73 | 55.38 | 47.63 | 42.50 | 37.23 | 48.48 | |||||||||||||
| 2008 | 34.81 | 40.45 | 40.73 | 42.58 | 52.92 | 55.15 | 60.82 | 62.00 | 56.93 | 48.23 | 45.10 | 33.12 | f | 49.06 | ||||||||||||
| 2009 | 35.50 | b | 38.11 | 39.42 | 45.40 | 50.98 | 57.68 | 64.40 | ----- | z | 57.73 | 48.27 | 42.32 | 32.13 | 46.54 | |||||||||||
| 2010 | 42.63 | 42.93 | 43.56 | 45.37 | 45.39 | 54.19 | a | 60.42 | 61.13 | 58.65 | 50.23 | 40.73 | 39.29 | 48.71 | ||||||||||||
| 2011 | 38.42 | 36.32 | 42.23 | 42.80 | 48.16 | 55.48 | 60.03 | 62.11 | 61.02 | 50.63 | 41.25 | 36.82 | 47.94 | |||||||||||||
| 2012 | 38.08 | 41.90 | 43.02 | 49.22 | 51.87 | 55.40 | 62.00 | 63.19 | 57.32 | 49.34 | 44.43 | 38.60 | 49.53 | |||||||||||||
| 2013 | 35.18 | 40.50 | 42.23 | g | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 37.84 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 37.30 | 39.94 | 43.35 | 46.59 | 51.79 | 56.77 | 61.35 | 61.61 | 57.41 | 49.52 | 42.20 | 37.38 | 48.80 | |||||||||||||
| S.D. | 2.92 | 2.93 | 2.30 | 2.13 | 2.14 | 1.89 | 1.84 | 1.97 | 2.00 | 1.70 | 2.58 | 2.58 | 0.73 | |||||||||||||
| SKEW | -0.71 | -0.42 | 0.20 | -0.22 | -0.39 | 0.55 | 0.10 | 0.19 | 0.21 | 0.73 | -1.26 | -0.77 | 0.41 | |||||||||||||
| MAX | 42.63 | 45.93 | 48.06 | 50.22 | 56.19 | 62.17 | 64.98 | 65.58 | 62.17 | 53.92 | 45.75 | 42.15 | 50.62 | |||||||||||||
| MIN | 28.79 | 31.04 | 38.95 | 42.17 | 45.39 | 53.57 | 57.71 | 58.03 | 54.05 | 46.60 | 33.70 | 31.32 | 47.33 | |||||||||||||
| NO YRS | 46 | 46 | 45 | 44 | 45 | 45 | 45 | 45 | 46 | 46 | 46 | 45 | 42 | |||||||||||||