| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1960 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 81.38 | q | ----- | z | ----- | z | 39.80 | a | 39.80 | |
| 1961 | 46.47 | a | 44.52 | a | 45.93 | a | 57.45 | a | 61.32 | 81.07 | 86.03 | 87.55 | 68.63 | 59.81 | 46.90 | 38.77 | 60.37 | |||||||||
| 1962 | 38.10 | 44.39 | 44.84 | 61.30 | 56.61 | 74.73 | 82.65 | 76.61 | 77.57 | 61.81 | 50.30 | 44.10 | 59.42 | |||||||||||||
| 1963 | 39.29 | 51.32 | ----- | z | ----- | z | 66.39 | 67.80 | 73.06 | 78.94 | 78.33 | ----- | z | 46.83 | ----- | z | 62.75 | |||||||||
| 1964 | ----- | z | 44.21 | ----- | z | ----- | z | ----- | z | ----- | z | 78.48 | 75.32 | 71.17 | 64.06 | 42.90 | 38.35 | 59.21 | ||||||||
| 1965 | 37.52 | 45.54 | 54.87 | 58.50 | 61.39 | 71.03 | 81.48 | 78.13 | 71.43 | 66.42 | 49.03 | 39.94 | 59.61 | |||||||||||||
| 1966 | 37.87 | 42.54 | 46.97 | 61.23 | 69.16 | 69.93 | 76.29 | 79.61 | 75.20 | 63.97 | 48.93 | 38.81 | 59.21 | |||||||||||||
| 1967 | 38.87 | 45.29 | 46.94 | 49.33 | 66.71 | 74.07 | 83.58 | 89.32 | 80.57 | 59.32 | 51.73 | 36.48 | 60.18 | |||||||||||||
| 1968 | 36.68 | 48.76 | 54.74 | 55.17 | 62.52 | 73.27 | ----- | z | 74.81 | 74.23 | 58.26 | 47.60 | 36.74 | 56.62 | ||||||||||||
| 1969 | 33.35 | 38.96 | 48.71 | 54.83 | 69.52 | 73.67 | 80.13 | 79.42 | 73.47 | 56.48 | 52.03 | 41.35 | 58.49 | |||||||||||||
| 1970 | 39.45 | 50.68 | 50.90 | 50.30 | 66.26 | 76.93 | 83.00 | 84.45 | 67.47 | 59.87 | 47.57 | 35.77 | 59.39 | |||||||||||||
| 1971 | 36.06 | 41.25 | 41.35 | 52.37 | 64.74 | 66.30 | 83.68 | 84.52 | 68.53 | 57.55 | 45.83 | 36.16 | 56.53 | |||||||||||||
| 1972 | 36.39 | 41.24 | 48.48 | 51.80 | 68.10 | 74.40 | 84.03 | a | 84.39 | 69.57 | 62.35 | ----- | z | 35.10 | 59.62 | |||||||||||
| 1973 | 36.16 | 48.61 | 48.16 | 58.90 | 69.16 | 71.83 | 82.81 | 80.55 | 73.43 | 60.55 | 38.83 | 38.42 | 58.95 | |||||||||||||
| 1974 | 36.42 | 41.07 | 46.90 | 54.37 | 62.00 | 76.40 | 78.61 | 82.39 | 83.60 | 69.06 | 49.50 | 41.13 | 60.12 | |||||||||||||
| 1975 | 38.87 | 40.11 | 46.23 | 49.57 | 64.16 | 70.47 | 80.13 | 75.13 | 81.33 | 55.77 | 43.40 | 40.55 | 57.14 | |||||||||||||
| 1976 | 39.45 | 41.38 | 46.84 | 52.70 | 67.58 | 68.93 | 79.10 | 73.65 | 76.27 | 66.94 | 54.77 | 43.06 | 59.22 | |||||||||||||
| 1977 | 42.26 | 53.86 | 45.65 | 62.90 | 56.94 | 77.67 | ----- | z | 83.97 | 68.00 | 63.03 | 44.27 | 42.03 | 58.23 | ||||||||||||
| 1978 | 41.06 | 47.36 | 57.65 | 54.33 | 60.29 | 73.37 | 80.45 | 76.19 | 65.43 | 68.87 | 44.60 | 37.10 | 58.89 | |||||||||||||
| 1979 | 36.48 | 38.93 | 54.74 | 53.23 | 67.84 | 74.57 | 81.00 | 76.77 | 77.53 | 65.13 | 47.93 | 42.52 | 59.72 | |||||||||||||
| 1980 | 40.23 | 48.72 | 48.29 | 58.33 | 61.71 | 65.03 | 81.35 | 77.94 | 74.70 | 65.90 | 49.53 | 41.16 | 59.41 | |||||||||||||
| 1981 | 48.71 | 46.82 | 53.13 | 55.40 | 61.19 | 68.20 | 79.39 | 85.74 | 74.57 | 59.39 | 48.87 | 40.06 | 60.12 | |||||||||||||
| 1982 | 36.00 | 40.93 | 48.48 | 54.87 | 65.90 | 72.57 | 78.00 | 79.97 | 70.33 | 59.90 | 45.60 | 40.74 | 57.77 | |||||||||||||
| 1983 | 42.94 | 46.25 | 51.71 | 56.93 | 70.65 | 70.00 | 73.45 | 80.23 | 72.57 | 65.58 | 46.53 | 34.71 | 59.30 | |||||||||||||
| 1984 | 41.87 | 46.48 | 53.29 | 51.00 | 62.42 | 69.30 | 86.16 | 82.61 | 73.20 | 56.13 | 43.27 | 36.23 | 58.50 | |||||||||||||
| 1985 | 40.26 | 43.07 | 49.58 | 61.77 | 66.39 | 77.17 | 88.03 | 78.65 | 66.87 | 59.94 | 38.27 | 37.68 | 58.97 | |||||||||||||
| 1986 | 41.87 | 42.86 | 57.16 | 57.10 | a | 65.26 | 76.97 | 74.87 | 86.97 | ----- | z | 65.74 | 53.07 | 41.90 | 60.34 | |||||||||||
| 1987 | 37.48 | 46.18 | 51.81 | 68.53 | 68.52 | 79.57 | 76.42 | 84.77 | 80.17 | ----- | z | 48.70 | 38.32 | 61.86 | ||||||||||||
| 1988 | 35.74 | 47.75 | a | 50.94 | 58.87 | 63.45 | 71.97 | 83.84 | 84.87 | 78.40 | 72.10 | 44.13 | 38.71 | 60.90 | ||||||||||||
| 1989 | 36.39 | 36.39 | 45.39 | 62.50 | 64.39 | 76.87 | 76.45 | 77.19 | 78.47 | 61.45 | 48.10 | 40.19 | 58.65 | |||||||||||||
| 1990 | 42.10 | 37.21 | 52.29 | 64.67 | 63.61 | 71.77 | 85.45 | 81.29 | 79.30 | 58.68 | 46.53 | 32.58 | 59.62 | |||||||||||||
| 1991 | 39.90 | 52.57 | 48.23 | 52.17 | 59.90 | 68.27 | 84.61 | 84.87 | 83.33 | 68.10 | 48.43 | 40.97 | 60.95 | |||||||||||||
| 1992 | 42.39 | 51.79 | 63.61 | 61.33 | 80.42 | 77.90 | 81.71 | 85.81 | 75.40 | 65.90 | 46.07 | 34.77 | 63.93 | |||||||||||||
| 1993 | 34.87 | 39.82 | 49.94 | 52.40 | 69.00 | 69.20 | 71.16 | 79.23 | 81.60 | 66.90 | 44.37 | 39.03 | 58.13 | |||||||||||||
| 1994 | 43.32 | 43.18 | 56.35 | 60.53 | 67.19 | 71.40 | 86.87 | 82.32 | 79.50 | 61.52 | 36.93 | 34.87 | 60.33 | |||||||||||||
| 1995 | 39.19 | 51.61 | 49.61 | 54.80 | 67.52 | 72.07 | 81.97 | 78.58 | 78.17 | 59.29 | 51.40 | 42.16 | 60.53 | |||||||||||||
| 1996 | 39.97 | 38.69 | 51.52 | 57.73 | 61.52 | 74.47 | 88.19 | 85.39 | 72.73 | 59.45 | 46.63 | 36.48 | 59.40 | |||||||||||||
| 1997 | 38.16 | 46.93 | 49.94 | 55.20 | 71.35 | 71.83 | 80.32 | 82.74 | 74.63 | 58.03 | 50.63 | 39.52 | 59.94 | |||||||||||||
| 1998 | 41.84 | 44.50 | 51.19 | 57.47 | 58.42 | 73.23 | 86.00 | 86.48 | 80.77 | 59.00 | 45.03 | 35.10 | 59.92 | |||||||||||||
| 1999 | 38.19 | 37.43 | 46.19 | 55.03 | 61.10 | 70.90 | 82.42 | 81.23 | 79.70 | 68.03 | 49.83 | 39.00 | 59.09 | |||||||||||||
| 2000 | 35.94 | 41.38 | 50.00 | 62.03 | 62.61 | 76.87 | 80.65 | 84.29 | 74.43 | 62.00 | 45.52 | i | 38.90 | k | 63.02 | |||||||||||
| 2001 | 40.24 | j | 46.68 | i | 56.59 | i | 56.71 | i | 72.38 | j | 74.70 | j | 84.10 | k | 84.48 | 79.88 | n | 64.19 | j | 47.30 | j | 35.57 | j | 84.48 | ||
| 2002 | 37.05 | j | 44.86 | 46.24 | j | 60.87 | 64.36 | i | 78.83 | l | 89.85 | k | 85.14 | j | 80.80 | j | 64.48 | 51.24 | i | 41.71 | j | 56.74 | ||||
| 2003 | 44.57 | j | 49.74 | i | 50.00 | j | 53.73 | h | 70.64 | i | 81.33 | i | 90.55 | i | 87.12 | f | 79.00 | 60.81 | 44.04 | g | 37.87 | 59.23 | ||||
| 2004 | 35.13 | h | 43.03 | 58.29 | 63.20 | 66.70 | h | 72.60 | e | 87.72 | m | 83.68 | 72.87 | g | 62.08 | f | 49.36 | e | 39.52 | f | 61.69 | |||||
| 2005 | 39.14 | j | 48.46 | d | 55.50 | e | 54.83 | 63.10 | 68.50 | 86.26 | 84.77 | 74.80 | 61.35 | 43.53 | 34.70 | a | 61.44 | |||||||||
| 2006 | 37.48 | 43.29 | 45.97 | 57.83 | 70.65 | ----- | z | 87.77 | 83.97 | 75.53 | 63.03 | ----- | z | ----- | z | 62.84 | ||||||||||
| 2007 | 41.04 | e | 44.12 | c | 56.26 | d | 55.73 | ----- | z | 73.17 | 84.26 | 79.90 | ----- | z | 55.35 | ----- | z | 35.84 | 58.41 | |||||||
| 2008 | 33.32 | 42.24 | 42.39 | 48.17 | 64.55 | 72.27 | 83.29 | 80.19 | 77.07 | 60.16 | 47.87 | 36.73 | a | 57.35 | ||||||||||||
| 2009 | 36.03 | 40.57 | 41.87 | 53.47 | 69.65 | 73.38 | a | 85.68 | 80.71 | 78.67 | 55.87 | 42.63 | 34.84 | 57.78 | ||||||||||||
| 2010 | 41.35 | 47.79 | 48.81 | 53.60 | 57.26 | 65.47 | 83.35 | 82.13 | 70.20 | 59.90 | 42.33 | 35.48 | 57.31 | |||||||||||||
| 2011 | 38.00 | 38.93 | 41.74 | 48.77 | 56.81 | 68.20 | 76.84 | 84.06 | 80.20 | 59.65 | 42.11 | c | 37.00 | 56.03 | ||||||||||||
| 2012 | 37.03 | 41.34 | 41.52 | 56.00 | 64.42 | 67.23 | 79.90 | 86.00 | ----- | z | 61.16 | 45.13 | 36.00 | 55.98 | ||||||||||||
| 2013 | 32.81 | 39.93 | 49.68 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 40.80 | ||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 38.83 | 44.22 | 49.80 | 56.45 | 64.77 | 72.40 | 81.50 | 81.66 | 75.35 | 61.96 | 46.62 | 38.27 | 59.20 | |||||||||||||
| S.D. | 3.23 | 4.30 | 4.84 | 4.53 | 4.62 | 3.73 | 4.11 | 3.74 | 4.62 | 3.98 | 3.79 | 2.72 | 1.44 | |||||||||||||
| SKEW | 0.64 | 0.31 | 0.41 | 0.33 | 0.56 | 0.12 | -0.49 | -0.24 | -0.28 | 0.44 | -0.39 | 0.14 | 0.43 | |||||||||||||
| MAX | 48.71 | 53.86 | 63.61 | 68.53 | 80.42 | 81.07 | 88.19 | 89.32 | 83.60 | 72.10 | 54.77 | 44.10 | 63.93 | |||||||||||||
| MIN | 32.81 | 36.39 | 41.35 | 48.17 | 56.61 | 65.03 | 71.16 | 73.65 | 65.43 | 55.35 | 36.93 | 32.58 | 56.03 | |||||||||||||
| NO YRS | 47 | 51 | 48 | 48 | 46 | 47 | 46 | 50 | 46 | 48 | 45 | 47 | 36 | |||||||||||||