| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1955 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 49.00 | t | 43.48 | 43.48 | ||
| 1956 | 41.61 | 38.83 | 54.06 | 62.30 | 70.74 | 81.10 | 90.03 | 85.97 | 82.81 | c | 62.58 | 51.87 | 44.06 | 63.83 | ||||||||||||
| 1957 | 33.65 | 47.25 | 52.94 | 58.69 | a | 66.97 | a | 81.67 | 89.74 | 87.65 | 82.30 | 59.16 | 45.87 | 44.90 | 62.56 | |||||||||||
| 1958 | 39.81 | 49.43 | 46.68 | 57.20 | 79.23 | 77.69 | a | 87.87 | 91.55 | 79.80 | 71.90 | 53.97 | 51.33 | a | 65.54 | |||||||||||
| 1959 | 45.10 | 44.46 | 54.07 | c | 67.13 | 64.65 | 83.63 | 93.68 | 87.16 | 72.54 | b | 68.00 | 57.97 | 41.61 | 65.00 | |||||||||||
| 1960 | 33.90 | 40.10 | 55.26 | 61.80 | 67.03 | 85.90 | 94.81 | 87.32 | 82.37 | 66.32 | 47.73 | 42.35 | 63.74 | |||||||||||||
| 1961 | 45.74 | 48.82 | 51.45 | 60.67 | 70.71 | 87.67 | 93.23 | 91.23 | 72.20 | 63.65 | 49.97 | 39.19 | 64.54 | |||||||||||||
| 1962 | 34.16 | 40.82 | 47.10 | a | 66.27 | 64.26 | 79.60 | 87.10 | 85.90 | 81.30 | 65.48 | 51.93 | 43.16 | 62.26 | ||||||||||||
| 1963 | 40.58 | 52.04 | 49.10 | 53.43 | 69.39 | 73.27 | 87.48 | 88.71 | 81.77 | 69.74 | 49.23 | 40.03 | 62.90 | |||||||||||||
| 1964 | 39.84 | 45.79 | 49.00 | a | 57.77 | 68.13 | 73.87 | 91.19 | 87.52 | b | 77.83 | 72.58 | 48.63 | 42.00 | 62.85 | |||||||||||
| 1965 | 39.26 | 48.93 | a | 52.16 | 61.17 | 65.32 | 76.30 | 88.77 | 83.00 | 72.13 | 73.68 | 53.07 | 41.65 | 62.95 | ||||||||||||
| 1966 | 41.42 | 41.79 | 55.90 | 65.57 | 78.61 | 78.93 | 90.90 | 89.80 | a | 82.03 | 67.84 | 53.17 | 41.16 | 65.59 | ||||||||||||
| 1967 | 43.32 | 50.86 | 51.52 | 50.57 | 73.00 | 77.00 | 93.13 | 93.97 | 83.60 | 70.35 | 53.60 | 39.42 | 65.03 | |||||||||||||
| 1968 | 43.13 | 51.83 | 57.42 | 58.87 | 70.23 | 80.50 | 93.35 | 79.90 | 78.27 | 67.77 | 48.43 | 40.26 | 64.16 | |||||||||||||
| 1969 | 42.19 | 40.86 | 51.19 | 63.90 | 75.19 | 76.77 | 91.06 | 92.42 | 82.63 | 61.13 | a | 54.03 | 44.32 | 64.64 | ||||||||||||
| 1970 | 43.00 | 52.64 | 49.87 | 54.30 | 70.48 | 79.10 | 91.10 | 94.32 | 76.20 | 63.52 | 50.20 | 36.45 | 63.43 | |||||||||||||
| 1971 | 45.42 | 48.25 | 50.68 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 49.24 | e | 36.00 | e | 45.92 | ||||
| 1972 | 38.41 | b | 47.62 | 59.07 | a | 57.40 | 73.77 | 81.27 | 91.32 | 89.68 | 73.50 | 63.87 | 46.83 | ----- | z | 65.70 | ||||||||||
| 1973 | 38.03 | 47.71 | 49.03 | 58.33 | 70.32 | 82.63 | 92.10 | 86.94 | 77.87 | 64.97 | 47.07 | 44.42 | 63.29 | |||||||||||||
| 1974 | 39.52 | 47.39 | 52.13 | 59.47 | 69.68 | 88.60 | 90.42 | 88.03 | 83.70 | 65.87 | 52.90 | 41.39 | 64.92 | |||||||||||||
| 1975 | 40.52 | 42.29 | 48.23 | 50.50 | 69.07 | a | 76.87 | 91.58 | ----- | z | ----- | z | ----- | z | 48.70 | 45.55 | 57.03 | |||||||||
| 1976 | 44.10 | 47.62 | 48.48 | 59.77 | 76.10 | 78.80 | 91.03 | 80.87 | 79.07 | 68.87 | 61.00 | 49.42 | 65.43 | |||||||||||||
| 1977 | 35.16 | 51.96 | 49.45 | 68.53 | 63.29 | 85.07 | 90.39 | 87.87 | 78.73 | 68.97 | 51.10 | 46.42 | 64.75 | |||||||||||||
| 1978 | 43.19 | 46.71 | 58.68 | 57.63 | 67.06 | 80.10 | a | 91.03 | 87.58 | 73.37 | 72.00 | 49.40 | 38.48 | 63.77 | ||||||||||||
| 1979 | 31.29 | 42.50 | 57.29 | 59.53 | 72.00 | 83.47 | 91.77 | 84.97 | 83.90 | 68.77 | 46.47 | 47.58 | 64.13 | |||||||||||||
| 1980 | 40.81 | 48.21 | 49.35 | 65.27 | 68.10 | 76.57 | 91.58 | 87.97 | 78.90 | 67.65 | 54.03 | 47.71 | 64.68 | |||||||||||||
| 1981 | 38.84 | 48.79 | 53.94 | 64.93 | a | 69.26 | 81.00 | 92.32 | 93.81 | 81.97 | 61.74 | 53.27 | 46.71 | 65.55 | ||||||||||||
| 1982 | 39.90 | 44.14 | 50.61 | 58.63 | 71.35 | 77.83 | 86.74 | 91.23 | 76.20 | 63.03 | 42.83 | 38.68 | 61.77 | |||||||||||||
| 1983 | 44.13 | 47.93 | 49.87 | 54.97 | 68.77 | 78.20 | 86.61 | 88.19 | 80.60 | 69.68 | 48.93 | 34.74 | 62.72 | |||||||||||||
| 1984 | 32.84 | 42.79 | 53.29 | 56.93 | 70.84 | 74.27 | 92.03 | 90.90 | 79.03 | 58.81 | 47.87 | 36.94 | 61.38 | |||||||||||||
| 1985 | 35.42 | 41.04 | 49.23 | 68.57 | 73.29 | 85.53 | 94.68 | 87.74 | 70.97 | 64.67 | j | 42.40 | 35.03 | 62.17 | ||||||||||||
| 1986 | 45.65 | 50.04 | 59.39 | 60.83 | 73.61 | 90.40 | 91.68 | 95.65 | 70.37 | 68.61 | 54.60 | 41.06 | 66.82 | |||||||||||||
| 1987 | 40.84 | 46.36 | 52.48 | 72.23 | 73.97 | 84.27 | 86.52 | 89.48 | 85.00 | 73.77 | 50.47 | 40.03 | 66.29 | |||||||||||||
| 1988 | 38.84 | 53.28 | 58.16 | 65.43 | 73.10 | 84.83 | 94.94 | 91.29 | 80.77 | 77.90 | 47.80 | 36.84 | 66.93 | |||||||||||||
| 1989 | 38.97 | 37.18 | 55.03 | 67.37 | 70.74 | 84.07 | 94.94 | 85.87 | 80.63 | 65.71 | 54.13 | 46.10 | 65.06 | |||||||||||||
| 1990 | 44.26 | 43.89 | 58.48 | 68.90 | 67.77 | 82.70 | 93.23 | 89.52 | 85.77 | 69.74 | 55.20 | 35.10 | 66.21 | |||||||||||||
| 1991 | 42.94 | 55.32 | 50.71 | 58.53 | 64.10 | 76.87 | 92.87 | 91.90 | 83.50 | 69.23 | 48.53 | 42.84 | 64.78 | |||||||||||||
| 1992 | 45.45 | 53.55 | 60.90 | 69.13 | 82.32 | 84.30 | 87.94 | 91.81 | 81.47 | 70.10 | 44.93 | 37.68 | 67.46 | |||||||||||||
| 1993 | 33.74 | 36.14 | 53.84 | 58.87 | 75.03 | 75.23 | 81.94 | 85.61 | 82.20 | 66.61 | 47.87 | 42.74 | 61.65 | |||||||||||||
| 1994 | 48.81 | 45.29 | 60.55 | 64.00 | 72.48 | 85.03 | 94.84 | 93.68 | 83.27 | 65.39 | 42.03 | 39.87 | 66.27 | |||||||||||||
| 1995 | 43.52 | 57.14 | 52.19 | 58.80 | 66.87 | 76.53 | 88.94 | 89.65 | 82.77 | 69.52 | 59.43 | 42.55 | 65.66 | |||||||||||||
| 1996 | 43.39 | 46.69 | 57.32 | 63.40 | 68.48 | 83.27 | 94.48 | 92.84 | 78.43 | 65.87 | 53.70 | 44.74 | 66.05 | |||||||||||||
| 1997 | 42.42 | 46.79 | 59.32 | 59.17 | 76.52 | 79.63 | 89.61 | 91.97 | 82.20 | 66.55 | 54.17 | 40.77 | 65.76 | |||||||||||||
| 1998 | 45.90 | 45.43 | 54.26 | 58.50 | 64.00 | 75.47 | 93.68 | 94.81 | 82.83 | 63.94 | 49.63 | 39.84 | 64.02 | |||||||||||||
| 1999 | 46.06 | 45.96 | 53.32 | 59.07 | 70.19 | 80.13 | 92.45 | 89.58 | 82.13 | 74.29 | 58.53 | 45.32 | 66.42 | |||||||||||||
| 2000 | 44.42 | 50.00 | 56.48 | 68.80 | 73.35 | 87.30 | 92.52 | 93.23 | 79.70 | 63.94 | 43.83 | 42.52 | 66.34 | |||||||||||||
| 2001 | 38.52 | 43.82 | 57.03 | 59.83 | 79.71 | 84.73 | 90.26 | 95.71 | 84.67 | 71.97 | 53.57 | 39.32 | 66.59 | |||||||||||||
| 2002 | 41.32 | 48.21 | 52.16 | 63.77 | 71.81 | d | 84.50 | 96.42 | 87.77 | 81.53 | 65.85 | e | 54.80 | 47.26 | 66.28 | |||||||||||
| 2003 | 49.65 | 48.14 | 57.52 | 58.12 | e | 71.16 | f | 84.78 | l | 98.38 | j | 92.22 | m | 80.45 | h | 74.96 | h | 48.15 | d | 44.48 | j | 52.32 | ||||
| 2004 | 37.74 | l | 40.11 | j | 62.71 | j | 66.04 | f | 70.68 | l | 80.39 | l | ----- | z | ----- | z | 73.71 | w | 56.75 | s | 48.62 | d | 44.94 | m | 48.62 | |
| 2005 | 39.52 | f | 46.14 | g | 57.60 | k | 60.56 | e | 67.81 | 75.65 | g | 94.06 | 92.91 | i | ----- | z | 68.05 | k | 50.31 | d | 40.67 | d | 62.68 | |||
| 2006 | 45.39 | h | 46.69 | l | 48.32 | i | 57.11 | l | ----- | z | 86.10 | i | 96.39 | 89.60 | u | ----- | z | 67.08 | r | 52.35 | g | 43.38 | g | 96.39 | ||
| 2007 | 42.96 | g | 48.86 | g | 62.00 | l | 62.90 | j | 76.26 | l | 84.05 | k | 97.35 | h | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2008 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 70.33 | y | 60.42 | r | ----- | z | 9999.00 | |
| 2009 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 94.43 | q | 86.97 | 82.23 | 60.61 | 52.90 | 36.52 | 63.85 | ||||||
| 2010 | 43.19 | 45.39 | 48.61 | 57.70 | 61.81 | 76.60 | 89.81 | 86.71 | 83.80 | 68.16 | 49.20 | 44.81 | 62.98 | |||||||||||||
| 2011 | 41.94 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 41.94 | ||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 41.08 | 46.69 | 53.36 | 61.08 | 70.64 | 80.83 | 91.32 | 89.28 | 79.98 | 67.30 | 50.66 | 41.82 | 64.61 | |||||||||||||
| S.D. | 4.16 | 4.53 | 3.87 | 4.88 | 4.48 | 4.22 | 2.89 | 3.58 | 3.97 | 4.13 | 4.19 | 3.90 | 1.57 | |||||||||||||
| SKEW | -0.45 | -0.13 | 0.24 | 0.16 | 0.38 | 0.18 | -0.71 | -0.32 | -0.97 | 0.11 | 0.16 | 0.15 | -0.30 | |||||||||||||
| MAX | 49.65 | 57.14 | 60.90 | 72.23 | 82.32 | 90.40 | 96.42 | 95.71 | 85.77 | 77.90 | 61.00 | 51.33 | 67.46 | |||||||||||||
| MIN | 31.29 | 36.14 | 46.68 | 50.50 | 61.81 | 73.27 | 81.94 | 79.90 | 70.37 | 58.81 | 42.03 | 34.74 | 61.38 | |||||||||||||
| NO YRS | 50 | 49 | 49 | 49 | 48 | 47 | 49 | 47 | 47 | 46 | 52 | 50 | 44 | |||||||||||||