| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1965 | ----- | z | ----- | z | ----- | z | 38.04 | g | 36.55 | 44.07 | 49.00 | 48.97 | 38.20 | 39.61 | 31.92 | d | 22.52 | 38.85 | ||||||||
| 1966 | 25.74 | 23.75 | 28.74 | 31.50 | 39.03 | 41.57 | 46.16 | 49.71 | 42.78 | g | 31.23 | 29.40 | 26.16 | 33.91 | ||||||||||||
| 1967 | 25.03 | b | 26.04 | a | 26.15 | d | 25.68 | k | 36.10 | a | 44.04 | b | 49.84 | 50.81 | d | 45.40 | e | 33.35 | e | 28.14 | b | 17.58 | 34.77 | |||
| 1968 | ----- | z | 30.71 | a | 30.60 | a | 30.34 | a | 36.83 | a | 45.87 | g | 52.62 | b | ----- | z | 39.73 | d | 34.59 | d | 28.65 | d | 20.17 | g | 35.51 | |
| 1969 | 21.94 | 22.64 | 25.03 | 32.67 | i | 39.96 | e | 45.19 | d | 50.17 | b | 44.05 | j | 44.25 | b | 33.65 | e | 29.04 | c | 25.89 | d | 33.78 | ||||
| 1970 | 28.00 | 29.18 | 27.00 | 26.23 | 38.45 | b | 46.33 | c | 51.87 | 50.10 | 36.63 | 32.45 | b | 32.81 | d | 20.55 | b | 34.97 | ||||||||
| 1971 | 24.60 | a | 26.04 | d | 26.64 | f | 30.46 | d | 37.41 | d | 43.04 | g | 49.48 | h | 54.81 | j | 38.65 | g | 33.91 | i | 28.71 | m | ----- | z | 29.63 | |
| 1972 | 21.38 | g | 27.50 | e | 31.56 | f | 27.18 | h | 37.61 | 44.89 | b | 51.11 | d | 48.61 | h | 37.91 | g | 33.57 | c | 28.21 | f | 12.17 | h | 38.94 | ||
| 1973 | 22.78 | d | 27.79 | d | 26.92 | g | 28.48 | c | 39.60 | f | 43.82 | h | 48.50 | g | 50.96 | h | 42.30 | g | 34.48 | h | 29.55 | j | 28.50 | i | 26.35 | |
| 1974 | 20.16 | l | 21.14 | f | 28.23 | i | 28.53 | m | 35.45 | i | 44.71 | i | 47.80 | a | 49.00 | l | 44.13 | g | 33.05 | j | 28.41 | h | 26.37 | l | 47.80 | |
| 1975 | 24.34 | b | 25.48 | c | 26.56 | f | 27.57 | 36.93 | d | 43.77 | d | 54.72 | f | 46.33 | d | 43.40 | e | 35.04 | f | 26.14 | i | 27.67 | a | 34.44 | ||
| 1976 | 24.62 | b | 23.70 | b | 22.61 | c | 27.93 | c | 36.93 | a | 41.21 | b | 52.04 | d | 47.45 | 45.15 | d | 34.57 | h | 27.79 | k | 21.83 | a | 34.35 | ||
| 1977 | 17.16 | 26.87 | e | 23.11 | d | 33.29 | b | 34.79 | b | 49.41 | c | 52.21 | c | 53.23 | 43.80 | 37.41 | i | 28.96 | e | 27.57 | a | 35.49 | ||||
| 1978 | 29.45 | b | 29.82 | 33.68 | 32.03 | 34.47 | a | 43.93 | a | 51.48 | 49.12 | f | 42.65 | d | 36.65 | 26.65 | j | 15.33 | g | 37.13 | ||||||
| 1979 | 14.94 | 25.43 | 29.81 | 32.68 | b | 39.76 | b | 45.13 | 53.77 | 50.35 | 46.17 | 41.32 | 23.68 | h | 28.13 | 37.04 | ||||||||||
| 1980 | 23.16 | 32.41 | 26.50 | a | 33.93 | c | 38.87 | 41.07 | 53.74 | 47.39 | 43.14 | a | 36.44 | d | 30.18 | h | 27.68 | f | 37.67 | |||||||
| 1981 | 27.12 | f | 25.29 | d | 29.42 | e | 32.40 | j | 36.04 | f | ----- | z | ----- | z | ----- | z | 40.96 | f | 32.79 | g | 32.46 | f | 28.06 | 27.59 | ||
| 1982 | ----- | z | ----- | z | ----- | z | ----- | z | 37.42 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 20.57 | ----- | z | 28.99 | |||
| 1983 | ----- | z | 30.39 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 30.39 | ||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 23.48 | 27.07 | 27.51 | 30.40 | 37.41 | 44.22 | 50.91 | 49.37 | 42.59 | 35.29 | 28.69 | 24.60 | 34.97 | |||||||||||||
| S.D. | 4.08 | 2.81 | 3.33 | 2.55 | 1.62 | 2.33 | 2.25 | 2.11 | 3.09 | 3.21 | 3.67 | 3.72 | 0.00 | |||||||||||||
| SKEW | -0.78 | 0.29 | 0.18 | -0.21 | -0.14 | 0.56 | -0.68 | 0.26 | -0.81 | 0.70 | -1.33 | -0.67 | 0.00 | |||||||||||||
| MAX | 29.45 | 32.41 | 33.68 | 33.93 | 39.96 | 49.41 | 53.77 | 53.23 | 46.17 | 41.32 | 32.81 | 28.13 | 34.97 | |||||||||||||
| MIN | 14.94 | 22.64 | 22.61 | 26.23 | 34.47 | 41.07 | 46.16 | 46.33 | 36.63 | 31.23 | 20.57 | 17.58 | 34.97 | |||||||||||||
| NO YRS | 12 | 16 | 11 | 11 | 15 | 12 | 13 | 9 | 11 | 10 | 8 | 10 | 1 | |||||||||||||