| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1969 | ----- | z | ----- | z | ----- | z | 60.62 | i | 72.90 | b | 77.73 | 81.27 | a | 81.35 | e | 72.76 | a | 58.71 | 54.25 | b | 40.04 | e | 67.37 | |||
| 1970 | 39.58 | 45.82 | 51.54 | c | 52.35 | d | 70.65 | 80.47 | 84.77 | 85.58 | 70.30 | 58.29 | 46.10 | 40.03 | 60.46 | |||||||||||
| 1971 | 45.23 | 47.11 | 47.48 | 57.90 | 68.26 | 70.73 | 85.23 | a | 88.81 | 69.33 | 59.83 | a | 49.23 | 40.58 | 60.81 | |||||||||||
| 1972 | 40.19 | 45.72 | 55.65 | 54.67 | 70.87 | a | 75.13 | 83.77 | 83.58 | 69.13 | 60.26 | 48.20 | 34.55 | 60.14 | ||||||||||||
| 1973 | 37.23 | 45.04 | 52.29 | 60.00 | 69.03 | 74.23 | 85.58 | 80.90 | 72.70 | 59.61 | 42.60 | 43.77 | 60.25 | |||||||||||||
| 1974 | 32.53 | a | 47.14 | 51.06 | 55.53 | 63.81 | 79.97 | 80.55 | 82.90 | 78.67 | 63.58 | 48.37 | 43.45 | 60.63 | ||||||||||||
| 1975 | 42.68 | 41.39 | 47.32 | 52.70 | 66.19 | 70.23 | 83.42 | 77.13 | a | 76.17 | 57.68 | 46.83 | 44.06 | 58.82 | ||||||||||||
| 1976 | 43.44 | d | 44.62 | 49.26 | 55.80 | 65.41 | i | 70.04 | b | 85.41 | n | 76.10 | 75.90 | 63.48 | 49.53 | 43.81 | 57.20 | |||||||||
| 1977 | 36.23 | 47.86 | 51.10 | 66.53 | 61.42 | 79.13 | 81.16 | 86.16 | 68.30 | 60.84 | 45.13 | 39.23 | 60.26 | |||||||||||||
| 1978 | 37.00 | 44.61 | 54.39 | 57.33 | 62.96 | e | 75.93 | 82.13 | 77.97 | 67.63 | 63.61 | 42.47 | 37.16 | 58.60 | ||||||||||||
| 1979 | 24.65 | 42.50 | 54.55 | 57.47 | 70.90 | a | 76.64 | b | 85.37 | a | 81.03 | a | 78.62 | a | 64.39 | 41.80 | 44.34 | b | 60.19 | |||||||
| 1980 | 33.41 | b | 40.48 | 49.94 | 61.52 | a | 66.90 | 69.74 | c | 84.16 | 78.43 | a | 76.69 | a | 63.16 | 48.93 | 47.58 | 60.08 | ||||||||
| 1981 | 39.23 | a | 45.64 | 54.00 | 60.36 | b | 64.80 | a | 71.39 | b | 81.24 | b | 87.41 | b | 76.27 | 61.71 | 50.37 | 40.55 | 61.08 | |||||||
| 1982 | 40.87 | 43.79 | 51.39 | 56.93 | 68.13 | 76.40 | 81.61 | 82.32 | 71.07 | 59.26 | 43.63 | 38.03 | 59.45 | |||||||||||||
| 1983 | 44.94 | 45.64 | 52.39 | 57.73 | 69.65 | 71.17 | 75.94 | 81.42 | 69.87 | 63.00 | 48.17 | 29.87 | 59.15 | |||||||||||||
| 1984 | 43.61 | 46.45 | 54.13 | 54.27 | 62.84 | 70.00 | 85.06 | 82.65 | 71.10 | 55.81 | 44.97 | 37.68 | 59.05 | |||||||||||||
| 1985 | 32.97 | 44.39 | 51.65 | 63.20 | 67.42 | 76.27 | 89.87 | a | 80.45 | 66.27 | 60.29 | 35.47 | 26.87 | 57.93 | ||||||||||||
| 1986 | 41.32 | 44.29 | 56.65 | 57.63 | 68.39 | 80.23 | 77.29 | 87.61 | 66.93 | 65.84 | 51.71 | i | 39.13 | 62.30 | ||||||||||||
| 1987 | 39.58 | 45.57 | 53.10 | 66.82 | h | 72.90 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 52.61 | l | 46.07 | q | 52.79 | |||||
| 1988 | 39.41 | n | ----- | z | 52.65 | n | 63.47 | m | 70.24 | n | 68.53 | o | 89.39 | m | 86.00 | i | 77.87 | 73.00 | 50.67 | 43.90 | 61.36 | |||||
| 1989 | 46.39 | 36.46 | 50.03 | 65.17 | 69.00 | 79.13 | 83.67 | j | 79.68 | 79.25 | j | 64.55 | 54.87 | 44.65 | 58.99 | |||||||||||
| 1990 | 45.52 | 45.75 | 57.00 | 67.40 | 65.74 | 74.83 | 87.84 | 85.86 | j | 84.95 | j | 63.19 | 53.00 | j | 37.06 | 60.48 | ||||||||||
| 1991 | 44.33 | j | 54.89 | 52.03 | 60.00 | 63.82 | i | 71.43 | 87.45 | 88.87 | ----- | z | ----- | z | ----- | z | ----- | z | 69.11 | |||||||
| 1992 | ----- | z | ----- | z | ----- | z | ----- | z | 72.06 | 81.40 | 82.10 | 85.71 | 74.60 | 67.13 | 48.20 | 37.81 | 68.63 | |||||||||
| 1993 | 33.26 | 35.93 | 51.94 | 58.73 | 71.58 | 71.57 | 75.39 | 81.52 | 80.13 | 67.23 | 46.27 | 39.81 | 59.44 | |||||||||||||
| 1994 | 50.71 | 42.96 | 58.65 | 63.00 | 69.71 | 75.87 | 90.55 | 85.45 | 81.17 | 63.48 | 46.73 | 43.90 | 64.35 | |||||||||||||
| 1995 | 40.71 | 52.75 | 54.09 | i | 59.30 | 68.90 | 72.70 | 81.90 | 80.26 | 79.03 | 62.06 | 56.70 | 41.06 | 63.22 | ||||||||||||
| 1996 | 45.32 | 44.41 | 52.90 | 62.20 | 63.87 | 76.17 | 88.03 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 61.84 | ||||||||
| 1997 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 72.78 | l | 82.94 | m | 85.90 | 74.83 | ----- | z | ----- | z | 42.06 | 67.60 | ||||
| 1998 | 42.16 | 45.71 | ----- | z | 57.90 | 62.65 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 52.11 | |||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 39.95 | 44.88 | 52.52 | 59.02 | 67.75 | 74.94 | 83.40 | 82.77 | 73.56 | 62.40 | 47.37 | 40.04 | 60.04 | |||||||||||||
| S.D. | 5.65 | 3.91 | 2.80 | 3.99 | 3.39 | 3.74 | 3.94 | 3.63 | 4.51 | 3.64 | 4.63 | 4.60 | 1.40 | |||||||||||||
| SKEW | -0.65 | 0.06 | 0.20 | 0.39 | -0.27 | 0.11 | -0.23 | 0.04 | 0.01 | 0.77 | -0.24 | -1.11 | 1.54 | |||||||||||||
| MAX | 50.71 | 54.89 | 58.65 | 67.40 | 72.90 | 81.40 | 90.55 | 88.87 | 81.17 | 73.00 | 56.70 | 47.58 | 64.35 | |||||||||||||
| MIN | 24.65 | 35.93 | 47.32 | 52.35 | 61.42 | 69.74 | 75.39 | 76.10 | 66.27 | 55.81 | 35.47 | 26.87 | 57.93 | |||||||||||||
| NO YRS | 25 | 26 | 24 | 25 | 26 | 26 | 24 | 25 | 24 | 25 | 23 | 26 | 17 | |||||||||||||