| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1959 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 37.27 | 30.97 | b | 17.04 | b | 11.45 | b | 24.18 | ||
| 1960 | 12.42 | 16.54 | a | 25.94 | 26.90 | 31.94 | 44.34 | a | 49.10 | 43.20 | a | 39.04 | b | 27.74 | 21.96 | e | 18.55 | 29.80 | ||||||||
| 1961 | 16.52 | 24.93 | 25.57 | a | 26.27 | 32.74 | 47.03 | a | 49.89 | c | 48.74 | d | 34.44 | e | 29.29 | 17.54 | b | 18.10 | 30.92 | |||||||
| 1962 | 5.38 | b | 17.39 | 19.13 | 31.53 | 33.48 | 42.29 | b | 46.17 | b | 43.55 | 39.19 | d | 31.81 | 24.96 | d | 22.52 | d | 29.78 | |||||||
| 1963 | 9.07 | b | 28.71 | 22.03 | a | 24.97 | 39.31 | e | 40.17 | 42.79 | b | 43.34 | b | 41.73 | 33.07 | c | 25.64 | b | 18.00 | 30.74 | ||||||
| 1964 | 12.90 | 11.14 | 19.13 | a | 25.96 | b | 32.23 | e | 39.41 | c | 47.03 | a | 41.24 | b | 33.04 | c | 30.84 | 18.18 | b | 22.74 | 27.82 | |||||
| 1965 | 16.77 | 19.11 | 22.10 | 31.27 | d | 31.17 | a | 41.27 | 44.11 | d | 44.06 | 33.44 | c | 30.32 | 25.14 | a | 15.73 | e | 29.54 | |||||||
| 1966 | 15.90 | 13.18 | 21.45 | 28.70 | 35.70 | d | 40.60 | 44.74 | d | 48.40 | a | 38.43 | 26.00 | b | 25.97 | 19.86 | b | 29.91 | ||||||||
| 1967 | 18.31 | b | 21.19 | a | 22.37 | d | 23.59 | a | 32.52 | d | 41.33 | 49.61 | 50.00 | 46.94 | n | 27.42 | 25.43 | 8.59 | d | 29.12 | ||||||
| 1968 | 13.19 | ----- | z | 25.58 | 24.37 | 32.32 | 41.43 | 50.45 | 42.87 | 35.90 | 29.13 | 22.70 | 18.10 | 30.55 | ||||||||||||
| 1969 | 18.61 | 15.93 | 16.26 | 27.77 | 36.68 | 46.00 | k | 47.97 | 43.45 | 38.57 | 26.32 | 20.70 | 19.77 | 28.37 | ||||||||||||
| 1970 | 20.87 | 23.75 | 22.81 | 22.77 | 33.90 | b | 43.20 | 47.61 | 43.94 | 31.50 | d | 24.90 | 27.57 | 12.32 | 29.59 | |||||||||||
| 1971 | 19.81 | 18.54 | 18.35 | 26.50 | 32.26 | 38.50 | 46.61 | 48.58 | 33.70 | 25.58 | 23.28 | a | 12.26 | 28.66 | ||||||||||||
| 1972 | 12.00 | 19.14 | 27.35 | 26.23 | 35.10 | a | 42.23 | 47.16 | 46.81 | 36.03 | 29.77 | 21.57 | 11.62 | b | 29.59 | |||||||||||
| 1973 | 12.65 | 19.14 | 22.06 | 28.77 | 38.13 | 40.97 | 49.42 | 44.35 | 38.13 | 27.32 | 28.79 | f | 22.81 | 31.25 | ||||||||||||
| 1974 | 13.46 | c | 16.25 | 21.10 | 25.33 | 33.42 | 43.97 | 46.71 | 46.00 | g | 37.40 | 24.87 | a | 23.37 | k | 12.30 | a | 27.48 | ||||||||
| 1975 | 9.96 | f | 15.95 | h | 19.57 | a | 20.86 | a | 30.30 | k | 36.15 | q | 48.97 | a | 44.00 | k | 37.61 | b | 26.56 | f | ----- | z | 13.71 | n | 31.75 | |
| 1976 | 13.83 | a | 17.59 | 13.38 | b | 23.36 | p | 32.57 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 19.34 | ||
| 1977 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1978 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1979 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 31.95 | j | 16.10 | 19.76 | f | 16.10 | ||
| 1980 | 15.39 | 26.76 | 21.70 | k | 25.63 | 35.93 | b | 35.47 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 27.84 | |||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 14.53 | 19.33 | 21.42 | 26.32 | 34.08 | 41.48 | 47.40 | 45.18 | 36.59 | 28.46 | 22.25 | 16.54 | 29.64 | |||||||||||||
| S.D. | 3.91 | 4.75 | 3.61 | 2.77 | 2.34 | 2.69 | 2.19 | 2.74 | 2.75 | 2.56 | 3.66 | 4.58 | 0.90 | |||||||||||||
| SKEW | -0.46 | 0.40 | -0.37 | 0.17 | 0.88 | -0.15 | -0.54 | 0.52 | -0.18 | 0.13 | -0.35 | -0.14 | -0.54 | |||||||||||||
| MAX | 20.87 | 28.71 | 27.35 | 31.53 | 39.31 | 47.03 | 50.45 | 50.00 | 41.73 | 33.07 | 27.57 | 22.81 | 30.92 | |||||||||||||
| MIN | 5.38 | 11.14 | 13.38 | 20.86 | 31.17 | 35.47 | 42.79 | 41.24 | 31.50 | 24.87 | 16.10 | 8.59 | 27.82 | |||||||||||||
| NO YRS | 17 | 16 | 17 | 17 | 17 | 15 | 16 | 14 | 16 | 16 | 15 | 16 | 10 | |||||||||||||