| 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 | 30.08 | 20.18 | a | 25.13 | j | |
| 1972 | 22.89 | 29.48 | 38.50 | b | 37.50 | d | 50.21 | 59.08 | 64.71 | 64.71 | 53.43 | 45.87 | a | 31.72 | 21.02 | 43.26 | ||||||||||
| 1973 | 21.29 | b | 28.57 | 31.48 | b | 38.98 | c | ----- | z | 59.13 | 65.87 | a | 65.24 | 53.15 | 45.32 | 33.47 | 28.95 | 42.86 | a | |||||||
| 1974 | 23.47 | 26.80 | 37.37 | a | 39.97 | a | 49.44 | 64.10 | 66.97 | 64.15 | 57.22 | 45.19 | 34.30 | e | 24.85 | a | 44.48 | |||||||||
| 1975 | 24.07 | b | 27.43 | 31.69 | 33.88 | 44.79 | b | 54.82 | 68.89 | 62.87 | 57.10 | 44.47 | 31.82 | 31.44 | 42.77 | |||||||||||
| 1976 | 28.44 | 30.34 | 30.80 | d | 40.43 | b | 53.25 | c | 56.82 | h | 69.17 | h | 60.87 | 54.17 | i | 44.67 | d | 37.98 | a | 28.46 | e | 39.47 | c | |||
| 1977 | 25.04 | d | 28.58 | j | 29.75 | k | 43.09 | h | 43.36 | b | 63.04 | d | 66.67 | d | 65.64 | b | 56.38 | b | 47.16 | b | 35.06 | c | 30.94 | f | 50.29 | d |
| 1978 | 30.81 | m | 31.40 | c | 39.92 | g | 41.59 | g | 47.48 | a | 57.48 | a | 66.92 | e | 63.38 | g | 53.71 | d | 49.94 | f | 30.30 | j | 21.43 | j | 51.40 | g |
| 1979 | 18.00 | k | 28.31 | g | 34.82 | q | 41.11 | h | 53.37 | p | 57.79 | i | 67.41 | h | 62.18 | n | 60.33 | c | 48.91 | d | ----- | z | ----- | z | 54.62 | j |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 24.20 | 29.01 | 33.97 | 38.15 | 48.09 | 59.61 | 66.67 | 63.91 | 55.90 | 45.94 | 33.49 | 25.82 | 43.51 | |||||||||||||
| S.D. | 2.42 | 1.75 | 3.66 | 2.64 | 3.65 | 3.46 | 1.38 | 1.78 | 2.63 | 1.58 | 2.61 | 4.56 | 0.88 | |||||||||||||
| SKEW | 0.76 | 0.06 | 0.42 | -0.91 | 0.04 | 0.06 | 0.24 | -0.83 | 0.44 | 1.00 | 0.46 | -0.15 | 0.47 | |||||||||||||
| MAX | 28.44 | 31.40 | 38.50 | 40.43 | 53.25 | 64.10 | 68.89 | 65.64 | 60.33 | 48.91 | 37.98 | 31.44 | 44.48 | |||||||||||||
| MIN | 21.29 | 26.80 | 30.80 | 33.88 | 43.36 | 54.82 | 64.71 | 60.87 | 53.15 | 44.47 | 30.08 | 20.18 | 42.77 | |||||||||||||
| YRS | 6 | 6 | 5 | 5 | 6 | 6 | 6 | 6 | 7 | 7 | 7 | 6 | 3 | |||||||||||||