| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1965 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 37.05 | b | 21.72 | f | 37.05 | k |
| 1966 | 26.26 | b | 26.12 | d | 36.32 | a | 43.47 | a | 55.77 | 58.88 | 65.68 | 65.77 | 57.15 | 45.58 | a | 38.25 | 29.40 | 45.72 | ||||||||
| 1967 | 29.90 | 34.80 | 37.32 | a | 35.33 | 50.03 | 56.42 | 68.15 | 66.89 | 58.45 | 47.81 | b | 39.38 | a | 22.35 | a | 45.57 | |||||||||
| 1968 | 27.06 | 36.52 | 37.77 | 39.37 | 50.65 | 60.38 | 67.81 | 59.76 | 53.73 | 45.27 | 34.83 | 24.52 | a | 44.81 | ||||||||||||
| 1969 | 32.50 | 26.95 | 31.16 | 44.12 | 54.60 | 57.00 | a | 66.89 | 67.37 | 59.82 | 40.88 | a | 34.97 | 29.48 | 45.48 | |||||||||||
| 1970 | 31.15 | a | 35.71 | 34.05 | 36.07 | 51.12 | a | 58.87 | 67.66 | 68.02 | 53.57 | 42.87 | a | 38.90 | 25.72 | a | 45.31 | |||||||||
| 1971 | 30.31 | 32.32 | 35.98 | 42.30 | 48.15 | 58.38 | 68.21 | 69.00 | 54.63 | 41.71 | 32.97 | 19.35 | a | 44.44 | ||||||||||||
| 1972 | 26.31 | 34.78 | 42.69 | 43.18 | 53.15 | 62.57 | 68.47 | 64.73 | 56.15 | 45.60 | 34.80 | 22.97 | 46.28 | |||||||||||||
| 1973 | 22.97 | 31.66 | 34.92 | a | 40.17 | 54.05 | 61.50 | 66.53 | 64.47 | 54.03 | 46.03 | 36.13 | 30.63 | 45.26 | ||||||||||||
| 1974 | 25.75 | a | 31.89 | a | 41.11 | 42.20 | 52.58 | 64.87 | 67.32 | 62.52 | a | 58.92 | 45.65 | 37.28 | a | 27.66 | c | 46.48 | ||||||||
| 1975 | 26.83 | a | 32.34 | 36.02 | 35.80 | 48.92 | 58.41 | a | 68.82 | 62.15 | 58.15 | 46.32 | 33.33 | 31.35 | 44.87 | |||||||||||
| 1976 | 28.35 | 33.84 | 33.61 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 31.94 | i | |||
| 1977 | 21.56 | n | 32.90 | h | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 61.17 | y | 54.65 | j | 48.54 | g | 36.97 | l | ----- | z | ----- | z |
| 1978 | 27.22 | o | 30.55 | h | 41.20 | d | 41.95 | h | ----- | z | 55.29 | b | 63.98 | g | 62.07 | b | 51.79 | d | 46.45 | i | 32.97 | l | ----- | z | 52.59 | h |
| 1979 | 24.06 | v | 34.38 | x | ----- | z | 44.09 | g | ----- | z | 59.06 | c | 65.80 | a | 62.34 | 59.00 | 49.79 | 34.52 | g | 30.62 | c | 54.43 | f | |||
| 1980 | 26.28 | a | 35.62 | a | 33.32 | 44.32 | b | 46.25 | c | 56.44 | d | 66.70 | f | 60.73 | 51.14 | l | ----- | z | 32.42 | f | 31.55 | 41.81 | d | |||
| 1981 | 30.77 | g | 31.12 | d | 35.35 | 45.14 | b | 48.41 | b | 60.45 | 65.29 | 65.15 | a | 59.06 | c | 40.57 | d | 40.33 | d | 33.17 | b | 47.64 | a | |||
| 1982 | 18.71 | b | 30.50 | c | 33.45 | b | 38.85 | c | 48.72 | b | 55.15 | c | 64.34 | b | 66.84 | b | 55.18 | e | 43.88 | f | 33.65 | c | 27.08 | e | 42.95 | a |
| 1983 | 27.07 | d | 31.80 | h | 37.39 | d | 38.13 | d | 49.24 | d | ----- | z | 62.95 | a | 64.53 | b | 58.20 | b | 47.50 | b | 33.87 | c | 32.77 | a | 45.17 | b |
| 1984 | 27.62 | b | 32.48 | 37.03 | 39.80 | 53.96 | c | 55.88 | d | 68.30 | a | 65.73 | a | 58.34 | a | 39.63 | e | 34.86 | e | 23.93 | b | 44.80 | ||||
| 1985 | 22.84 | b | 26.73 | b | 32.59 | c | 47.45 | b | 52.07 | a | 63.11 | b | 69.57 | d | 64.17 | p | 52.12 | 44.78 | a | 30.34 | a | 30.23 | k | 44.16 | b | |
| 1986 | ----- | z | ----- | z | ----- | z | ----- | z | 53.28 | b | 64.06 | f | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 53.28 | k |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 26.87 | 32.09 | 36.18 | 40.98 | 51.23 | 58.98 | 66.99 | 64.59 | 56.37 | 44.67 | 35.68 | 27.66 | 45.36 | |||||||||||||
| S.D. | 3.41 | 3.24 | 3.12 | 3.60 | 2.71 | 2.86 | 1.78 | 2.65 | 2.64 | 2.93 | 2.69 | 4.13 | 0.63 | |||||||||||||
| SKEW | -0.59 | -0.57 | 0.57 | -0.05 | -0.07 | 0.46 | -0.73 | -0.16 | -0.38 | -0.25 | 0.02 | -0.43 | 0.39 | |||||||||||||
| MAX | 32.50 | 36.52 | 42.69 | 47.45 | 55.77 | 64.87 | 69.57 | 69.00 | 59.82 | 49.79 | 40.33 | 33.17 | 46.48 | |||||||||||||
| MIN | 18.71 | 26.13 | 31.16 | 35.33 | 46.25 | 55.15 | 62.95 | 59.76 | 51.79 | 39.63 | 30.34 | 19.35 | 44.44 | |||||||||||||
| YRS | 16 | 16 | 18 | 16 | 17 | 17 | 16 | 17 | 17 | 15 | 16 | 16 | 11 | |||||||||||||