| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1969 | ----- | z | ----- | z | ----- | z | ----- | z | 71.90 | u | 70.47 | 75.07 | a | 77.52 | 74.10 | 67.29 | 62.97 | 55.10 | 68.93 | |||||||
| 1970 | 55.00 | 63.07 | 60.74 | 58.43 | 67.54 | g | 73.37 | 80.00 | 76.84 | 74.87 | 69.26 | 56.17 | 49.10 | 65.17 | ||||||||||||
| 1971 | 51.16 | 55.39 | 55.10 | 59.93 | 63.45 | 67.43 | 75.94 | 77.97 | 75.27 | 65.19 | 57.27 | 48.58 | 62.72 | |||||||||||||
| 1972 | 49.74 | 56.31 | 61.23 | 58.80 | 68.13 | 74.57 | 81.48 | 81.10 | 74.77 | ----- | z | 58.77 | 48.58 | 64.86 | ||||||||||||
| 1973 | 50.74 | 59.79 | 55.19 | 65.50 | 70.13 | 73.77 | ----- | z | 75.52 | 77.00 | 67.65 | 52.87 | 54.19 | 63.85 | ||||||||||||
| 1974 | 50.65 | 54.25 | 59.52 | 61.47 | 65.69 | b | 71.52 | a | 77.26 | 78.22 | m | 84.67 | i | 72.97 | 60.43 | 53.94 | 62.77 | |||||||||
| 1975 | 54.48 | 54.89 | 55.71 | 56.90 | 67.65 | 72.97 | 76.81 | 75.74 | 80.33 | 63.65 | 55.63 | 54.26 | 64.08 | |||||||||||||
| 1976 | 55.06 | 53.62 | 56.42 | 59.97 | 70.52 | 70.43 | 77.39 | 75.06 | 78.07 | 71.52 | 63.20 | 55.52 | 65.56 | |||||||||||||
| 1977 | 56.35 | 62.00 | 55.65 | 65.03 | 61.74 | 74.57 | 76.84 | 80.39 | 70.40 | 68.16 | 55.57 | 55.29 | 65.17 | |||||||||||||
| 1978 | 56.77 | 57.46 | 64.03 | 60.37 | 67.39 | 74.30 | 78.58 | 78.68 | 73.27 | 74.55 | 57.07 | 49.06 | 65.96 | |||||||||||||
| 1979 | 51.48 | 52.18 | 63.05 | i | 61.17 | 69.68 | 75.30 | 78.87 | 77.52 | 80.63 | 71.35 | 59.33 | 57.81 | 66.85 | ||||||||||||
| 1980 | 52.94 | 60.14 | 57.45 | 64.53 | 66.32 | 67.57 | 76.81 | 76.87 | 77.60 | 73.39 | 61.20 | 57.26 | 66.01 | |||||||||||||
| 1981 | 61.45 | 61.07 | 61.90 | 63.77 | 67.00 | 73.53 | 79.26 | 80.32 | 77.67 | 68.39 | 60.47 | 54.29 | 67.43 | |||||||||||||
| 1982 | 51.32 | 56.46 | 57.26 | 61.23 | 70.00 | 71.63 | 74.19 | 78.94 | 76.90 | 68.00 | 57.20 | 53.26 | 64.70 | |||||||||||||
| 1983 | 55.77 | 57.64 | 59.29 | 63.37 | 69.16 | 72.40 | 72.97 | 77.74 | 77.20 | 70.26 | 57.73 | 51.71 | 65.44 | |||||||||||||
| 1984 | 56.13 | 57.03 | 61.23 | 59.40 | 67.19 | 70.20 | 80.45 | 79.00 | 78.90 | 64.77 | 55.60 | 50.84 | 65.06 | |||||||||||||
| 1985 | 56.77 | 56.18 | 55.87 | 65.00 | 66.94 | 76.50 | 80.32 | 81.16 | 72.53 | 68.00 | 51.00 | 53.87 | 65.35 | |||||||||||||
| 1986 | 56.58 | 57.54 | 65.90 | 60.97 | 68.42 | 75.60 | 76.42 | 81.84 | 73.80 | 71.94 | 60.07 | 55.26 | 67.03 | |||||||||||||
| 1987 | ----- | z | 56.96 | 60.87 | 67.83 | 70.50 | a | 76.43 | 74.81 | 83.39 | 78.17 | 75.23 | a | 60.33 | 50.00 | 68.59 | ||||||||||
| 1988 | 53.23 | 60.38 | 61.03 | 63.97 | 66.13 | 71.57 | 81.42 | 80.42 | 78.97 | 73.19 | 56.37 | 51.23 | 66.49 | |||||||||||||
| 1989 | 52.68 | 50.64 | 57.61 | 70.80 | 67.71 | 75.20 | 74.26 | 77.03 | 79.40 | 69.74 | ----- | z | 50.26 | 65.94 | ||||||||||||
| 1990 | 50.40 | a | 50.21 | 60.28 | b | 64.03 | 66.58 | 70.25 | j | 80.39 | 79.32 | 76.93 | c | 65.35 | 54.00 | k | 43.39 | 63.69 | ||||||||
| 1991 | ----- | z | 58.96 | 55.39 | 60.07 | o | ----- | z | ----- | z | 80.06 | m | 80.53 | p | 85.94 | n | 72.81 | 60.25 | n | ----- | z | 62.39 | ||||
| 1992 | 52.20 | p | ----- | z | 64.23 | i | ----- | z | ----- | z | ----- | z | 78.39 | m | 84.06 | o | 76.40 | 70.87 | a | ----- | z | ----- | z | 73.63 | ||
| 1993 | 48.83 | m | 53.32 | 60.50 | m | 59.93 | p | 69.94 | o | 69.25 | j | 73.77 | 77.95 | k | 76.68 | k | 68.06 | 53.13 | 49.00 | 59.46 | ||||||
| 1994 | 53.23 | 51.39 | 61.19 | 66.33 | x | 68.50 | q | 71.00 | y | 79.19 | 80.24 | n | 79.53 | o | 66.03 | 48.69 | a | 48.46 | r | 59.95 | ||||||
| 1995 | 54.94 | o | 59.14 | n | 59.80 | p | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 66.81 | 57.53 | o | 53.73 | i | 66.81 | ||
| 1996 | 48.73 | p | 56.89 | j | ----- | z | 69.20 | y | 63.93 | q | 75.11 | k | 82.37 | l | 81.32 | 75.93 | 72.19 | o | 55.93 | 51.23 | 66.10 | |||||
| 1997 | 50.47 | a | 52.93 | m | 59.55 | i | 62.35 | m | 74.35 | 73.19 | n | 79.56 | v | 81.90 | j | 74.90 | 63.42 | 56.10 | j | 49.94 | n | 65.79 | ||||
| 1998 | 52.64 | i | 52.94 | l | ----- | z | 61.95 | j | 59.50 | k | 69.60 | o | ----- | z | 79.43 | j | 78.40 | 64.62 | b | 52.60 | 46.55 | 60.54 | ||||
| 1999 | 49.39 | 50.62 | o | 56.00 | q | 64.29 | p | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 49.39 | ||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 53.56 | 56.54 | 59.04 | 62.50 | 67.84 | 72.82 | 77.50 | 78.80 | 76.50 | 69.02 | 57.07 | 51.98 | 65.46 | |||||||||||||
| S.D. | 3.02 | 3.55 | 3.07 | 3.36 | 2.67 | 2.61 | 2.57 | 2.24 | 2.51 | 3.39 | 3.67 | 3.49 | 1.23 | |||||||||||||
| SKEW | 0.62 | -0.06 | 0.37 | 0.58 | 0.04 | -0.56 | -0.09 | 0.14 | -0.45 | 0.10 | -0.34 | -0.42 | -0.53 | |||||||||||||
| MAX | 61.45 | 63.07 | 65.90 | 70.80 | 74.35 | 76.50 | 81.48 | 83.39 | 80.63 | 75.23 | 63.20 | 57.81 | 67.43 | |||||||||||||
| MIN | 49.39 | 50.21 | 55.10 | 56.90 | 61.74 | 67.43 | 72.97 | 75.06 | 70.40 | 63.42 | 48.69 | 43.39 | 62.72 | |||||||||||||
| NO YRS | 23 | 24 | 22 | 21 | 21 | 21 | 23 | 22 | 25 | 28 | 24 | 25 | 13 | |||||||||||||