| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1966 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 66.62 | 77.50 | 74.85 | a | 66.37 | 51.16 | 42.37 | 24.61 | 57.64 | e | ||||||
| 1967 | 31.24 | 37.20 | 42.34 | 41.90 | 56.61 | 61.40 | a | 78.10 | 77.11 | 64.48 | 53.13 | 43.26 | a | 27.48 | 51.19 | |||||||||||
| 1968 | 28.11 | 38.71 | 43.32 | a | 44.53 | 56.26 | 67.65 | 76.94 | 67.79 | 62.82 | 51.18 | 38.85 | 28.45 | 50.38 | ||||||||||||
| 1969 | 34.33 | a | 30.25 | 35.50 | 48.85 | 63.69 | 63.07 | 76.52 | a | 78.21 | 66.80 | 44.63 | a | 37.12 | ----- | z | 52.63 | a | ||||||||
| 1970 | ----- | z | 37.47 | l | 39.38 | c | 41.25 | p | 57.65 | 66.73 | 76.02 | 77.87 | 58.91 | a | ----- | z | ----- | z | ----- | z | 62.76 | f | ||||
| 1971 | ----- | z | ----- | z | ----- | z | ----- | z | 54.16 | 66.25 | 75.97 | 75.19 | 59.50 | 46.87 | a | 35.80 | 27.39 | 55.14 | d | |||||||
| 1972 | 29.79 | 35.79 | a | 45.94 | 46.70 | 59.76 | 68.79 | i | 76.68 | 73.50 | 60.90 | 50.65 | 35.80 | 24.69 | 49.11 | a | ||||||||||
| 1973 | 23.23 | 32.21 | 37.29 | 45.73 | 60.31 | 68.83 | a | 74.76 | 76.50 | 62.65 | 53.56 | 38.70 | 33.03 | 50.57 | ||||||||||||
| 1974 | 28.97 | 32.80 | 44.19 | 45.20 | h | 59.11 | 74.03 | 77.83 | a | 74.40 | 66.68 | 52.79 | 41.95 | j | ----- | z | 56.76 | c | ||||||||
| 1975 | 29.58 | 33.62 | 38.44 | 40.90 | 54.87 | 64.57 | 78.28 | a | 72.60 | a | 65.59 | c | 47.83 | g | 35.17 | d | 34.35 | 49.82 | a | |||||||
| 1976 | 30.88 | a | 34.88 | 35.92 | 46.07 | a | 61.37 | 68.15 | d | 78.58 | 70.98 | c | 64.82 | 50.60 | 42.24 | a | 30.97 | 51.29 | ||||||||
| 1977 | 30.13 | h | ----- | z | 36.48 | 53.28 | 51.85 | 73.43 | 78.13 | 73.71 | 66.33 | 54.88 | a | 43.02 | 38.00 | 56.91 | b | |||||||||
| 1978 | 34.58 | 37.84 | 46.44 | 49.17 | 55.97 | 67.80 | 78.21 | 74.35 | 64.33 | 56.27 | 37.20 | 26.11 | 52.36 | |||||||||||||
| 1979 | 20.40 | 33.50 | 41.15 | a | 49.33 | 60.34 | 70.70 | 78.98 | 75.40 | a | 70.95 | 57.10 | 34.65 | 34.40 | a | 52.24 | ||||||||||
| 1980 | 32.85 | 36.91 | 41.73 | 52.67 | 57.32 | 62.04 | q | 79.27 | 77.08 | 68.86 | b | 54.55 | ----- | z | 36.52 | a | 53.78 | b | ||||||||
| 1981 | 29.74 | b | 39.02 | 44.39 | 54.15 | 59.31 | 70.78 | 78.06 | 81.50 | 70.28 | 52.35 | 46.45 | h | 37.18 | i | 57.96 | b | |||||||||
| 1982 | 33.08 | g | 34.05 | h | 43.12 | f | 47.82 | h | 57.52 | e | 68.65 | g | 76.61 | i | 82.02 | f | 65.08 | f | 51.61 | i | 37.60 | d | 31.41 | i | 47.56 | j |
| 1983 | 35.88 | g | 37.82 | c | 45.48 | c | 44.38 | f | 58.67 | e | 67.00 | e | 77.29 | e | 72.98 | a | 63.88 | b | 51.77 | a | 39.30 | e | 34.29 | n | 57.13 | c |
| 1984 | 20.25 | e | 22.68 | d | 39.25 | c | 46.96 | c | 60.48 | h | 67.48 | f | 78.60 | e | 77.78 | h | 66.13 | g | 48.86 | f | 42.37 | d | 30.06 | g | 41.68 | f |
| 1985 | 25.33 | g | 31.48 | d | 40.54 | c | 56.96 | e | 65.00 | e | 75.00 | f | 81.04 | d | 80.10 | e | 62.31 | i | 51.77 | i | 33.92 | e | 20.78 | b | 51.23 | d |
| 1986 | 29.33 | e | 39.94 | c | 47.59 | d | 48.37 | c | 57.62 | e | 73.29 | a | 74.00 | b | 77.72 | b | 58.94 | d | 49.66 | ----- | z | ----- | z | 55.65 | b | |
| 1987 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 72.73 | 65.19 | a | 53.92 | 37.11 | c | 30.86 | i | 57.24 | h | ||
| 1988 | 24.11 | 33.62 | 40.60 | b | 50.15 | g | 58.29 | b | 71.95 | 79.35 | 74.02 | g | 62.88 | 58.26 | 39.72 | 25.92 | 49.47 | b | ||||||||
| 1989 | 22.50 | 24.95 | 44.11 | 53.40 | 56.62 | b | 65.80 | c | 78.34 | b | 72.72 | a | 63.68 | 51.37 | 40.31 | a | 31.67 | a | 50.46 | |||||||
| 1990 | 32.50 | b | 30.85 | a | 43.07 | a | 53.08 | 55.35 | a | 71.20 | g | 76.75 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 48.60 | f | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 28.38 | 33.90 | 41.58 | 48.94 | 58.08 | 68.23 | 77.62 | 75.11 | 64.52 | 52.35 | 38.66 | 29.63 | 51.21 | |||||||||||||
| S.D. | 4.62 | 4.59 | 3.58 | 4.49 | 3.02 | 3.57 | 1.56 | 3.15 | 3.34 | 3.30 | 2.98 | 4.97 | 0.82 | |||||||||||||
| SKEW | -0.53 | -0.92 | -0.15 | -0.06 | 0.35 | 0.02 | -0.33 | -0.08 | 0.05 | -0.40 | 0.14 | 0.08 | 0.43 | |||||||||||||
| MAX | 34.58 | 39.94 | 47.59 | 56.96 | 65.00 | 74.03 | 81.04 | 81.50 | 70.95 | 58.26 | 43.26 | 38.00 | 52.36 | |||||||||||||
| MIN | 20.25 | 22.68 | 35.50 | 40.90 | 51.85 | 61.40 | 74.00 | 67.79 | 58.91 | 44.63 | 33.92 | 20.78 | 50.38 | |||||||||||||
| YRS | 17 | 19 | 21 | 17 | 22 | 18 | 23 | 21 | 21 | 19 | 19 | 15 | 7 | |||||||||||||