| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1965 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 45.35 | 40.93 | 32.32 | 39.54 | ||||
| 1966 | 33.61 | 32.04 | 34.30 | a | 37.83 | 40.84 | ----- | z | 51.90 | 52.10 | a | 48.33 | 41.16 | 39.50 | 36.87 | 40.77 | ||||||||||
| 1967 | 34.52 | 33.54 | 35.13 | 36.37 | 41.94 | 51.27 | 52.00 | a | 54.19 | 50.03 | 44.19 | 40.12 | d | 32.84 | 42.18 | |||||||||||
| 1968 | 34.53 | a | 39.69 | 37.48 | 34.90 | 41.89 | c | 47.27 | 51.97 | 53.71 | 48.90 | 42.39 | 40.86 | a | 35.39 | 42.42 | ||||||||||
| 1969 | 32.94 | 32.61 | 33.00 | 37.03 | 45.77 | 53.77 | 51.23 | 49.77 | 49.63 | 40.73 | a | 40.07 | 38.23 | 42.06 | ||||||||||||
| 1970 | 37.97 | a | 36.71 | 36.39 | 34.60 | 41.17 | a | 50.07 | 50.97 | 49.58 | 44.36 | b | 40.07 | a | 39.75 | b | 34.71 | 41.36 | ||||||||
| 1971 | 33.19 | 35.75 | 34.87 | 37.52 | a | 42.87 | a | 47.83 | 51.52 | 54.17 | a | 44.28 | a | 39.43 | a | 37.79 | b | 32.10 | 40.94 | |||||||
| 1972 | 33.14 | c | 35.65 | c | 39.92 | e | 35.58 | f | 42.94 | 48.70 | 52.74 | 53.29 | 46.07 | 39.71 | 40.80 | 28.29 | 41.93 | |||||||||
| 1973 | 33.35 | 37.33 | a | 35.97 | 39.20 | 43.13 | 48.93 | 52.97 | b | 50.54 | c | 51.11 | c | 41.39 | 39.47 | 39.55 | 42.74 | |||||||||
| 1974 | 30.58 | 33.04 | 37.00 | 39.20 | 43.13 | 49.07 | 52.71 | 54.39 | 49.17 | 39.52 | 39.07 | 37.03 | 41.99 | |||||||||||||
| 1975 | 35.74 | 35.89 | 35.94 | 35.40 | 42.17 | a | 48.53 | 54.29 | 52.32 | 49.07 | 44.00 | 35.87 | 35.94 | 42.10 | ||||||||||||
| 1976 | 35.74 | 32.48 | 33.81 | 35.97 | 41.52 | 45.67 | 52.84 | 55.18 | i | 52.40 | 43.10 | 43.07 | 32.87 | a | 40.86 | |||||||||||
| 1977 | 30.55 | 37.21 | 36.84 | 38.67 | 44.66 | b | 52.47 | 53.30 | a | 59.00 | 52.20 | 46.39 | 37.48 | a | 39.74 | 44.04 | ||||||||||
| 1978 | 39.94 | 39.79 | 42.13 | 40.96 | c | 44.81 | 53.07 | b | ----- | z | ----- | z | 51.03 | 45.19 | 33.37 | 31.61 | 42.19 | |||||||||
| 1979 | 30.87 | 38.50 | 40.68 | 43.27 | 45.87 | 49.87 | 55.58 | 56.77 | i | 55.47 | 50.61 | ----- | z | 38.52 | 44.92 | |||||||||||
| 1980 | 34.09 | h | 41.03 | 38.73 | a | 40.67 | 49.32 | 50.03 | 56.23 | 51.16 | 48.77 | 44.10 | 42.13 | 38.16 | 45.49 | |||||||||||
| 1981 | 39.29 | 39.07 | 39.32 | 41.97 | 45.97 | 51.17 | 53.52 | 55.83 | a | 50.28 | a | 43.81 | 41.40 | 40.06 | 45.14 | |||||||||||
| 1982 | 34.29 | 34.71 | 37.19 | 36.97 | 44.61 | 53.43 | 55.13 | 54.81 | 50.83 | 45.74 | 37.40 | 36.39 | 43.46 | |||||||||||||
| 1983 | 35.97 | 39.39 | 42.81 | 39.63 | 47.10 | 49.43 | 53.26 | 56.10 | 47.53 | 44.55 | 42.43 | 35.97 | 44.51 | |||||||||||||
| 1984 | 35.87 | 37.31 | 41.03 | 40.43 | 44.77 | 48.97 | 54.23 | 54.26 | 48.47 | 43.45 | 38.77 | 33.94 | 43.46 | |||||||||||||
| 1985 | 33.84 | 34.00 | 34.94 | 43.17 | 45.03 | 51.27 | 56.74 | 52.77 | 47.63 | 41.23 | 34.27 | 30.71 | 42.13 | |||||||||||||
| 1986 | 37.68 | 39.21 | 41.10 | 39.43 | 44.29 | 53.63 | 53.23 | 57.55 | 49.30 | 46.55 | 42.10 | 36.19 | 45.02 | |||||||||||||
| 1987 | 32.45 | 35.43 | 38.13 | 41.17 | 48.23 | 51.57 | 54.77 | 53.90 | 49.47 | 43.48 | 42.83 | 35.19 | 43.89 | |||||||||||||
| 1988 | 34.48 | 36.10 | 36.45 | 42.93 | 43.87 | 49.80 | 55.52 | 54.10 | 48.37 | 49.13 | 40.20 | 33.32 | 43.69 | |||||||||||||
| 1989 | 33.97 | 26.93 | 37.84 | 43.83 | 46.06 | 51.57 | 53.77 | 53.71 | 48.43 | 43.00 | 39.83 | 35.39 | 42.86 | |||||||||||||
| 1990 | 37.52 | 33.29 | 38.71 | 43.60 | 45.52 | 49.63 | 55.32 | 57.71 | 51.73 | 41.32 | 37.87 | 27.45 | 43.31 | |||||||||||||
| 1991 | 30.13 | 41.54 | 36.52 | 40.70 | 44.23 | 48.97 | 55.94 | 55.61 | 50.00 | 41.97 | 43.07 | 37.10 | 43.81 | |||||||||||||
| 1992 | 37.52 | 39.00 | 41.06 | 44.80 | 47.39 | 54.17 | 56.42 | 54.03 | 49.17 | 44.42 | 40.57 | 34.74 | 45.27 | |||||||||||||
| 1993 | 33.03 | 34.18 | 43.45 | 43.10 | 48.77 | 50.30 | 52.48 | 54.52 | 47.90 | 45.10 | 32.53 | 33.74 | 43.26 | |||||||||||||
| 1994 | 36.10 | 34.14 | 38.13 | 42.93 | 47.90 | 49.17 | 54.77 | 52.74 | 50.57 | 41.94 | 35.47 | 37.13 | 43.42 | |||||||||||||
| 1995 | 37.42 | 40.61 | 38.74 | 39.83 | 45.94 | 50.63 | 56.94 | 51.77 | 53.87 | 43.42 | 44.83 | 40.13 | 45.34 | |||||||||||||
| 1996 | 38.00 | 37.55 | 38.23 | 43.10 | 44.90 | 49.40 | 57.90 | 54.81 | 47.77 | 45.68 | 41.97 | 38.26 | 44.80 | |||||||||||||
| 1997 | 35.61 | 36.54 | 38.81 | 41.47 | 48.65 | 51.90 | 55.74 | 56.29 | 52.10 | 45.97 | 43.37 | 34.10 | 45.04 | |||||||||||||
| 1998 | 40.26 | 38.18 | 38.48 | 41.03 | 47.19 | 51.83 | 57.29 | 55.97 | 51.63 | 44.06 | 42.53 | 34.06 | 45.21 | |||||||||||||
| 1999 | 37.89 | d | 36.64 | 37.48 | 39.70 | 42.87 | 49.00 | c | 53.77 | 56.77 | 47.93 | 40.70 | a | 44.23 | 36.90 | a | 43.66 | |||||||||
| 2000 | 36.16 | 40.62 | 36.29 | 42.28 | a | 48.06 | 53.43 | 54.94 | 53.23 | 50.30 | 44.15 | d | 36.80 | 37.07 | c | 44.44 | ||||||||||
| 2001 | 34.37 | a | 34.41 | a | 39.26 | d | 38.89 | c | 45.62 | b | 49.35 | d | 54.79 | b | 54.48 | b | 49.52 | a | 42.74 | 42.14 | b | 36.37 | a | 43.49 | ||
| 2002 | 35.90 | 35.18 | 34.45 | 41.70 | ----- | z | 49.80 | 56.19 | 52.77 | 48.70 | 39.45 | 37.20 | 40.23 | 42.87 | ||||||||||||
| 2003 | 41.68 | 34.86 | 41.48 | 41.73 | 45.10 | 53.12 | e | 56.19 | 56.29 | 50.80 | 45.58 | 40.07 | 38.23 | 45.43 | ||||||||||||
| 2004 | 38.29 | 37.00 | 38.94 | 41.60 | 47.81 | 52.77 | 56.58 | 57.55 | 51.37 | 45.90 | 39.17 | 39.42 | 45.53 | |||||||||||||
| 2005 | 36.06 | 35.18 | 40.10 | 41.63 | k | 49.32 | 51.53 | 55.58 | 55.90 | 46.20 | 46.45 | 40.10 | 37.74 | 44.92 | ||||||||||||
| 2006 | 39.00 | 32.07 | 36.23 | 41.20 | 46.84 | 55.27 | 56.90 | 53.23 | 46.56 | n | 40.48 | ----- | z | 36.10 | 43.73 | |||||||||||
| 2007 | ----- | z | 37.46 | 38.74 | 40.37 | 45.68 | 50.77 | 58.71 | 55.16 | 48.17 | 43.39 | 38.77 | 36.13 | 44.85 | ||||||||||||
| 2008 | 32.23 | 35.55 | 35.94 | 37.70 | 47.90 | 48.33 | 57.00 | 56.06 | 48.73 | 43.81 | 44.53 | 34.97 | 43.56 | |||||||||||||
| 2009 | 34.42 | 35.86 | 36.42 | 39.03 | 46.39 | 55.10 | 58.00 | 56.03 | 50.67 | 44.23 | 38.43 | 32.29 | 43.91 | |||||||||||||
| 2010 | 41.97 | 39.54 | 37.42 | 39.83 | 44.58 | 51.40 | 55.29 | 54.94 | 53.20 | 46.19 | 40.83 | 38.52 | 45.31 | |||||||||||||
| 2011 | 37.39 | 33.36 | 39.48 | 39.20 | 44.26 | 51.23 | 54.06 | 56.71 | 52.00 | a | 45.94 | 39.07 | b | 32.97 | 43.81 | |||||||||||
| 2012 | 35.26 | 35.17 | 36.55 | 44.23 | 45.23 | 50.97 | 56.03 | 56.13 | 49.33 | 44.26 | 43.67 | 37.68 | 44.54 | |||||||||||||
| 2013 | 32.97 | 37.04 | 38.52 | b | 50.50 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 32.00 | z | 36.17 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 35.51 | 36.22 | 37.93 | 40.20 | 45.26 | 50.77 | 54.72 | 54.45 | 49.63 | 43.65 | 39.93 | 35.68 | 43.71 | |||||||||||||
| S.D. | 2.85 | 2.87 | 2.38 | 2.59 | 2.25 | 2.09 | 1.96 | 2.11 | 2.23 | 2.47 | 2.86 | 2.96 | 1.24 | |||||||||||||
| SKEW | 0.22 | -0.46 | 0.23 | -0.36 | -0.07 | 0.15 | -0.09 | -0.31 | -0.02 | 0.26 | -0.56 | -0.66 | -0.34 | |||||||||||||
| MAX | 41.97 | 41.54 | 43.45 | 44.80 | 49.32 | 55.27 | 58.71 | 59.00 | 55.47 | 50.61 | 44.83 | 40.23 | 45.53 | |||||||||||||
| MIN | 30.13 | 26.93 | 33.00 | 34.60 | 40.84 | 45.67 | 50.97 | 49.58 | 44.28 | 39.43 | 32.53 | 27.45 | 40.94 | |||||||||||||
| NO YRS | 46 | 48 | 48 | 45 | 46 | 46 | 46 | 44 | 46 | 48 | 46 | 48 | 37 | |||||||||||||