| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1965 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 56.78 | 54.71 | ----- | z | 32.85 | a | 48.11 | |||
| 1966 | 34.03 | a | 33.05 | 41.02 | 48.93 | 58.76 | 61.38 | 69.97 | 71.02 | a | 66.23 | 49.53 | a | 42.88 | 36.98 | b | 51.15 | |||||||||
| 1967 | 37.66 | 38.52 | 39.74 | 43.48 | 55.19 | 65.78 | 74.96 | q | 73.79 | 66.62 | 50.39 | 39.40 | 30.10 | 49.15 | ||||||||||||
| 1968 | 31.24 | 38.90 | 43.87 | 43.80 | 53.95 | 61.62 | 69.64 | f | 64.47 | 60.50 | 47.37 | 37.30 | 28.85 | 46.53 | ||||||||||||
| 1969 | 27.66 | 32.98 | 40.66 | 48.02 | 57.97 | 63.92 | 66.68 | f | 67.42 | 60.68 | 46.10 | 40.35 | 34.82 | 47.33 | ||||||||||||
| 1970 | 35.24 | 39.46 | 39.23 | 41.87 | 54.03 | 64.20 | 69.85 | 70.85 | 54.23 | 45.69 | 38.52 | 29.98 | 48.60 | |||||||||||||
| 1971 | 33.27 | 36.79 | 37.03 | 46.02 | 56.10 | 58.45 | 68.87 | 73.68 | 55.67 | 46.50 | 38.52 | 30.24 | 48.43 | |||||||||||||
| 1972 | 28.45 | 34.91 | 43.34 | 43.08 | 56.48 | 62.52 | 68.95 | 70.50 | 55.47 | 48.98 | 38.92 | 26.32 | 48.16 | |||||||||||||
| 1973 | 28.58 | 37.34 | 42.50 | 47.12 | 56.73 | 64.40 | 72.26 | 69.05 | 59.97 | a | ----- | z | ----- | z | 37.77 | 51.57 | ||||||||||
| 1974 | 26.56 | 36.68 | 40.39 | 46.13 | 51.73 | 66.57 | 68.63 | 69.00 | 62.85 | 49.53 | 41.22 | 32.84 | 49.34 | |||||||||||||
| 1975 | 29.77 | 32.59 | 38.16 | 41.08 | 52.42 | 59.53 | 72.77 | 64.50 | 60.38 | 50.02 | 39.03 | 35.47 | 47.98 | |||||||||||||
| 1976 | 32.56 | 34.24 | 37.58 | 45.08 | 56.47 | 58.98 | 70.24 | 63.94 | 62.82 | 50.26 | 40.52 | 33.52 | 48.85 | |||||||||||||
| 1977 | 25.31 | 38.82 | 38.37 | 51.47 | 50.08 | 66.72 | 68.81 | 70.98 | 57.77 | 50.03 | 38.45 | 36.76 | 49.46 | |||||||||||||
| 1978 | 36.76 | 37.36 | 46.37 | 47.10 | 52.55 | 63.45 | 69.00 | 65.74 | 59.42 | d | 51.18 | 33.28 | 25.68 | 48.99 | ||||||||||||
| 1979 | 19.77 | a | 34.50 | 41.42 | 45.93 | 56.32 | 63.23 | 67.25 | q | 69.69 | 62.97 | 51.98 | 35.45 | 37.81 | 47.19 | |||||||||||
| 1980 | 28.23 | 38.97 | 39.61 | 49.98 | 54.42 | 58.68 | 69.06 | 64.93 | a | 61.02 | f | 50.82 | a | 41.22 | 37.00 | 48.45 | ||||||||||
| 1981 | 36.73 | a | 36.50 | 42.23 | 47.70 | 53.68 | 60.87 | 67.76 | 72.18 | 61.15 | 48.06 | 41.15 | 34.71 | 50.23 | ||||||||||||
| 1982 | 29.79 | 32.61 | 40.11 | 44.37 | 53.73 | 63.88 | 67.58 | 69.71 | 58.53 | 48.61 | 36.07 | a | 31.29 | 48.02 | ||||||||||||
| 1983 | 35.87 | 39.66 | 43.97 | 45.20 | 56.02 | 61.10 | 65.89 | 71.05 | 56.97 | 50.95 | 40.72 | 24.92 | 49.36 | |||||||||||||
| 1984 | 27.37 | 31.24 | 39.56 | 43.65 | 49.92 | 58.07 | 68.37 | a | 68.95 | 54.42 | d | 43.93 | d | 37.43 | 26.26 | 45.76 | ||||||||||
| 1985 | 23.47 | 26.00 | c | 34.91 | b | 47.58 | d | 54.26 | 62.20 | 74.42 | 64.63 | a | 51.98 | c | 45.50 | 25.87 | 22.29 | 44.43 | ||||||||
| 1986 | 35.27 | 37.79 | 44.87 | 46.18 | 54.63 | 66.97 | 64.77 | 72.40 | 54.72 | 49.63 | 38.18 | 32.37 | 49.82 | |||||||||||||
| 1987 | 29.13 | 37.52 | 42.48 | 52.02 | 56.82 | 63.68 | 66.87 | 66.00 | 62.62 | 51.66 | 40.72 | 32.05 | 50.13 | |||||||||||||
| 1988 | 29.23 | 34.53 | 40.35 | 48.55 | 53.98 | 62.43 | 69.90 | 68.61 | 60.25 | 55.86 | i | 39.63 | 29.44 | 48.81 | ||||||||||||
| 1989 | 27.98 | 23.89 | 39.18 | 49.72 | 53.98 | 64.72 | 70.25 | i | 65.05 | 59.38 | 48.55 | 40.42 | 34.02 | 46.08 | ||||||||||||
| 1990 | 35.06 | 32.91 | 41.77 | 51.47 | 52.02 | 61.07 | 71.06 | 70.23 | 66.57 | 46.81 | 40.08 | 24.19 | d | 49.44 | ||||||||||||
| 1991 | 26.56 | 41.36 | j | 38.70 | k | 44.59 | m | 50.45 | a | 57.88 | 69.05 | 71.48 | 62.45 | 49.29 | 38.68 | 36.05 | 51.32 | |||||||||
| 1992 | 35.95 | 41.67 | 45.77 | 50.08 | 59.40 | 67.42 | 67.39 | 70.00 | 57.87 | 51.98 | 35.68 | 25.40 | a | 50.72 | ||||||||||||
| 1993 | 22.75 | a | 26.61 | 39.56 | 45.20 | 58.82 | 58.67 | 60.34 | 64.05 | 59.42 | 50.53 | 32.55 | 33.71 | 46.02 | ||||||||||||
| 1994 | 36.53 | 32.25 | 43.47 | 49.70 | 56.76 | 60.78 | 71.87 | 71.27 | 62.90 | 49.03 | 33.43 | 32.31 | 50.03 | |||||||||||||
| 1995 | 34.31 | 40.04 | 41.10 | 46.00 | 55.34 | 60.33 | 69.05 | 65.65 | 63.75 | 46.73 | 42.13 | 34.63 | 49.92 | |||||||||||||
| 1996 | 33.32 | 33.03 | 42.48 | 47.48 | 51.87 | 61.23 | 70.68 | 68.05 | 57.62 | 48.48 | 39.72 | 33.37 | 48.95 | |||||||||||||
| 1997 | 31.81 | 34.03 | j | 41.68 | 43.87 | 57.02 | 61.08 | 68.10 | 71.53 | 62.92 | 48.92 | 41.27 | 32.27 | 50.95 | ||||||||||||
| 1998 | 35.32 | 38.62 | 41.74 | 46.55 | 54.00 | 60.78 | 73.85 | 71.32 | 65.75 | 48.79 | 41.13 | 30.40 | 50.69 | |||||||||||||
| 1999 | 34.76 | 33.59 | 39.65 | 44.35 | 51.68 | 61.20 | 69.74 | 71.63 | 59.70 | 50.77 | 43.97 | 30.98 | 49.33 | |||||||||||||
| 2000 | 30.35 | 37.40 | 39.05 | 49.68 | 55.73 | 63.58 | 71.23 | 70.58 | 58.60 | 48.81 | 32.48 | 30.87 | 49.03 | |||||||||||||
| 2001 | 29.16 | 32.89 | 41.89 | 44.87 | 56.37 | 60.67 | 70.21 | 72.81 | 64.13 | 49.27 | 42.88 | 31.85 | 49.75 | |||||||||||||
| 2002 | 31.65 | 32.16 | 36.77 | 46.98 | 53.06 | 63.97 | 73.98 | 66.74 | 61.42 | 45.44 | 39.98 | 34.92 | 48.92 | |||||||||||||
| 2003 | 37.11 | 33.54 | 43.29 | 46.03 | 53.97 | 64.65 | 73.69 | 71.48 | 62.52 | 52.38 | c | 33.80 | 32.97 | 50.45 | ||||||||||||
| 2004 | 29.13 | a | 33.88 | 44.90 | 47.78 | 53.60 | 62.70 | 70.48 | 68.92 | 58.17 | 47.77 | 38.23 | 33.92 | 49.12 | ||||||||||||
| 2005 | 33.11 | 34.36 | 42.34 | 46.55 | 55.56 | 58.28 | 69.40 | 70.05 | 58.02 | 49.05 | 36.10 | 27.58 | 48.37 | |||||||||||||
| 2006 | 35.37 | 32.14 | 38.74 | 46.73 | 56.02 | 62.98 | 73.47 | 67.55 | 59.65 | 47.34 | 38.70 | 30.65 | 49.11 | |||||||||||||
| 2007 | 27.13 | 36.55 | 43.47 | 47.20 | 55.52 | 62.65 | 74.58 | 67.66 | 59.53 | 48.06 | 36.77 | 30.16 | 49.11 | |||||||||||||
| 2008 | 26.39 | 35.31 | 37.00 | 42.27 | b | 54.53 | 59.02 | 69.02 | 67.32 | 58.70 | 48.48 | 42.33 | 28.50 | 47.41 | ||||||||||||
| 2009 | 28.45 | 34.61 | 35.02 | 45.32 | 55.29 | 62.18 | 69.77 | 67.92 | 63.50 | 44.71 | 38.83 | 25.58 | 47.60 | |||||||||||||
| 2010 | 36.76 | 35.55 | 41.11 | 44.57 | 49.13 | 59.08 | 67.76 | 67.05 | 59.08 | 50.13 | 36.20 | 32.42 | 48.24 | |||||||||||||
| 2011 | 29.15 | a | 32.23 | 38.40 | 41.74 | a | 48.95 | 57.97 | 65.50 | 68.76 | 62.97 | a | 48.95 | 36.92 | 30.11 | 46.80 | ||||||||||
| 2012 | 33.10 | 34.67 | 40.05 | 49.53 | 53.47 | 59.40 | a | 70.39 | 70.78 | a | 61.13 | 47.34 | 41.65 | 32.82 | 49.53 | |||||||||||
| 2013 | 24.94 | 35.76 | c | 40.66 | 55.25 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 23.50 | z | 33.79 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 31.00 | 34.88 | 40.78 | 46.48 | 54.44 | 61.93 | 69.63 | 68.96 | 60.19 | 48.89 | 38.45 | 31.46 | 48.84 | |||||||||||||
| S.D. | 4.34 | 3.60 | 2.62 | 2.67 | 2.48 | 2.59 | 2.79 | 2.71 | 3.37 | 2.16 | 3.40 | 3.78 | 1.42 | |||||||||||||
| SKEW | -0.35 | -0.83 | -0.10 | 0.08 | -0.30 | 0.24 | -0.60 | -0.28 | -0.14 | -0.01 | -1.27 | -0.43 | -1.10 | |||||||||||||
| MAX | 37.66 | 41.67 | 46.37 | 52.02 | 59.40 | 67.42 | 74.58 | 73.79 | 66.62 | 54.71 | 43.97 | 37.81 | 51.15 | |||||||||||||
| MIN | 19.77 | 23.89 | 34.91 | 41.08 | 48.95 | 57.88 | 60.34 | 63.94 | 51.98 | 43.93 | 25.87 | 22.29 | 44.43 | |||||||||||||
| NO YRS | 48 | 46 | 47 | 46 | 47 | 47 | 42 | 47 | 47 | 46 | 46 | 48 | 37 | |||||||||||||