| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1971 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 17.37 | 8.42 | 12.89 | j | ||
| 1972 | 12.06 | 16.21 | 22.76 | b | 20.15 | d | 31.26 | 40.93 | 43.48 | 45.06 | 36.37 | 31.45 | 21.50 | 9.03 | 27.52 | |||||||||||
| 1973 | 7.93 | b | 16.32 | 21.00 | b | 25.57 | b | ----- | z | 41.33 | 47.94 | 46.42 | 33.53 | 28.39 | 23.87 | 19.00 | 28.30 | a | ||||||||
| 1974 | 13.06 | 15.07 | 26.65 | 24.97 | a | 31.94 | 44.37 | 47.71 | 44.16 | 36.30 | 28.16 | 20.80 | e | 13.63 | a | 28.90 | ||||||||||
| 1975 | 12.60 | a | 17.54 | 21.74 | 22.40 | 29.90 | b | 38.47 | 51.19 | 44.32 | 37.53 | 31.55 | 18.47 | 19.03 | 28.73 | |||||||||||
| 1976 | 15.68 | 18.00 | 16.68 | c | 25.93 | 36.52 | b | 37.41 | h | 50.46 | g | 42.61 | 37.48 | i | 26.56 | d | 20.34 | a | 10.85 | e | 23.69 | c | ||||
| 1977 | 9.56 | d | 16.05 | i | 16.35 | k | 24.57 | g | 30.72 | b | 46.19 | c | 47.07 | d | 47.69 | b | 38.61 | b | 28.31 | b | 21.75 | b | 20.96 | f | 33.74 | d |
| 1978 | 18.19 | d | 20.73 | b | 27.42 | e | 28.27 | d | 33.03 | a | 37.86 | a | 46.18 | c | 43.48 | f | 37.85 | d | 30.73 | e | 15.71 | i | 8.45 | i | 31.14 | c |
| 1979 | 3.96 | g | 17.59 | f | 22.53 | l | 25.79 | f | 34.47 | n | 39.70 | g | 48.17 | g | 45.37 | l | 39.44 | c | 32.44 | d | ----- | z | ----- | z | 35.94 | j |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 12.73 | 17.31 | 22.71 | 24.55 | 32.23 | 41.52 | 47.26 | 45.05 | 37.09 | 29.70 | 20.58 | 13.33 | 28.38 | |||||||||||||
| S.D. | 3.47 | 1.97 | 3.95 | 2.86 | 2.36 | 3.25 | 2.51 | 1.79 | 1.93 | 2.10 | 2.16 | 4.76 | 0.75 | |||||||||||||
| SKEW | 0.20 | 0.77 | -0.21 | -0.37 | 1.05 | 0.29 | 0.08 | 0.21 | -0.72 | -0.10 | -0.09 | 0.32 | -0.67 | |||||||||||||
| MAX | 18.19 | 20.73 | 27.42 | 28.27 | 36.52 | 46.19 | 51.19 | 47.69 | 39.44 | 32.44 | 23.87 | 19.03 | 28.90 | |||||||||||||
| MIN | 7.93 | 15.07 | 16.68 | 20.15 | 29.90 | 37.86 | 43.48 | 42.61 | 33.53 | 26.56 | 17.37 | 8.42 | 27.52 | |||||||||||||
| YRS | 7 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 7 | 8 | 7 | 6 | 3 | |||||||||||||