| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1968 | 22.39 | 32.43 | 34.34 | 34.18 | h | 43.02 | a | 50.70 | 61.07 | a | 52.28 | h | 50.60 | a | 39.77 | c | 29.63 | 20.61 | 38.46 | |||||||
| 1969 | 19.29 | 22.91 | a | 28.28 | f | 35.40 | e | 44.42 | 54.46 | c | 56.86 | b | 57.44 | d | 51.41 | a | 37.17 | b | 33.91 | b | 28.47 | b | 40.16 | |||
| 1970 | 23.90 | j | 31.00 | e | 25.62 | j | 28.95 | h | ----- | z | 57.83 | l | 60.22 | k | 60.50 | l | 45.78 | g | 40.09 | b | 31.00 | c | 22.38 | b | 31.12 | |
| 1971 | 25.17 | e | 27.02 | 26.20 | f | 35.19 | i | 42.38 | c | 50.67 | 59.16 | 63.23 | 44.37 | 36.05 | 28.27 | 20.71 | 39.70 | |||||||||
| 1972 | 19.37 | a | 25.89 | a | 31.90 | 28.83 | c | 42.13 | a | 46.33 | i | 55.27 | 57.52 | 46.86 | a | 41.08 | 31.58 | ----- | z | 38.04 | ||||||
| 1973 | 17.61 | i | 27.30 | c | 31.72 | h | 37.28 | 46.73 | 51.37 | 59.66 | 59.40 | 50.65 | 40.68 | 28.31 | a | 28.27 | e | 42.96 | ||||||||
| 1974 | 16.88 | j | 26.29 | g | 31.61 | h | 35.25 | 38.77 | 52.36 | b | 57.45 | 58.65 | 59.78 | a | 45.87 | 32.45 | 25.77 | 45.15 | ||||||||
| 1975 | 23.02 | 23.30 | 27.03 | 29.30 | 38.90 | 47.35 | 61.63 | 56.04 | d | 54.71 | d | 38.21 | c | 30.74 | a | 30.19 | e | 38.37 | ||||||||
| 1976 | 21.71 | c | 19.75 | q | ----- | z | ----- | z | ----- | z | 53.88 | v | 60.12 | w | 54.80 | i | ----- | z | ----- | z | ----- | z | ----- | z | 21.71 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 21.82 | 27.12 | 31.09 | 33.21 | 42.34 | 51.15 | 58.73 | 58.71 | 51.20 | 39.86 | 30.74 | 25.20 | 38.37 | |||||||||||||
| S.D. | 2.25 | 3.59 | 3.72 | 3.87 | 2.85 | 2.34 | 2.31 | 2.49 | 5.03 | 3.00 | 1.96 | 3.97 | 0.00 | |||||||||||||
| SKEW | 0.16 | 0.30 | -0.38 | -0.28 | 0.07 | -0.29 | -0.17 | 0.99 | 0.39 | 0.79 | 0.14 | -0.06 | 0.00 | |||||||||||||
| MAX | 25.17 | 32.43 | 34.34 | 37.28 | 46.73 | 54.46 | 61.63 | 63.23 | 59.78 | 45.87 | 33.91 | 30.19 | 38.37 | |||||||||||||
| MIN | 19.29 | 22.91 | 27.03 | 28.83 | 38.77 | 47.35 | 55.27 | 56.04 | 44.37 | 36.05 | 28.27 | 20.61 | 38.37 | |||||||||||||
| NO YRS | 6 | 7 | 3 | 5 | 7 | 6 | 7 | 6 | 7 | 8 | 8 | 7 | 1 | |||||||||||||