| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1959 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 64.58 | x | 68.30 | i | 63.42 | f | 52.52 | j | 49.63 | 37.62 | 30.94 | 39.39 | i | |||
| 1960 | 31.00 | a | 30.31 | b | 35.68 | 45.13 | ----- | z | 61.10 | 64.03 | a | 63.05 | 61.07 | 52.37 | 41.90 | ----- | z | 48.56 | b | |||||||
| 1961 | 34.00 | 36.30 | 31.58 | 41.86 | a | 47.40 | 66.24 | a | 68.38 | a | 63.48 | 56.86 | s | 50.75 | i | 38.34 | a | 29.24 | 45.68 | b | ||||||
| 1962 | 27.16 | 28.40 | d | 29.98 | 43.50 | n | ----- | z | 57.27 | b | 62.41 | b | 62.58 | a | 56.52 | 48.79 | b | 38.70 | b | 33.02 | b | 44.48 | b | |||
| 1963 | 28.50 | 38.65 | a | 32.47 | a | 35.21 | a | 50.13 | 51.83 | 62.78 | a | 61.81 | b | 58.46 | e | 50.37 | d | 36.74 | a | 31.55 | 44.87 | |||||
| 1964 | 29.02 | a | 28.75 | a | 31.77 | 38.20 | 46.93 | a | 55.59 | a | 65.31 | b | 63.28 | a | 53.65 | d | 51.24 | b | 30.23 | 29.57 | b | 43.63 | ||||
| 1965 | 30.97 | b | 31.66 | 34.02 | a | 39.00 | 43.93 | a | 53.38 | b | 62.16 | 61.03 | b | 50.25 | 49.69 | 36.33 | 25.35 | 43.15 | ||||||||
| 1966 | 23.60 | 25.43 | 37.21 | 44.17 | 54.10 | 58.18 | 64.31 | 64.63 | 55.70 | 46.03 | 36.25 | 29.13 | 44.89 | |||||||||||||
| 1967 | 30.58 | 31.50 | 35.21 | 30.37 | 48.77 | e | 54.21 | a | 65.42 | 64.83 | b | 56.02 | a | 48.27 | a | 38.14 | b | ----- | z | 45.76 | a | |||||
| 1968 | 27.22 | v | 35.83 | 35.06 | 38.19 | d | 47.60 | 59.35 | c | 65.55 | a | 58.44 | 54.67 | 46.45 | 34.47 | 25.57 | a | 45.56 | a | |||||||
| 1969 | 30.46 | g | 20.08 | v | 35.61 | v | 41.43 | w | 52.90 | a | 55.35 | 65.00 | 66.16 | 57.92 | 39.97 | 33.58 | 28.66 | 49.94 | d | |||||||
| 1970 | 27.56 | e | 33.07 | 33.05 | 33.89 | l | 49.62 | e | 56.61 | g | 65.17 | e | 66.90 | b | 54.43 | 43.31 | 36.40 | e | 22.48 | c | 43.20 | b | ||||
| 1971 | 29.55 | 30.98 | 35.31 | 41.43 | 44.63 | 59.17 | 67.81 | 66.45 | b | 54.00 | 39.62 | b | 32.34 | b | 20.67 | g | 45.57 | a | ||||||||
| 1972 | 24.23 | a | 32.62 | a | 42.05 | b | 40.50 | c | 50.27 | c | 59.63 | c | 66.91 | c | 62.91 | b | 52.20 | b | 40.46 | c | 30.06 | d | 24.66 | c | 43.88 | |
| 1973 | 21.11 | i | 25.10 | c | 29.35 | e | 41.35 | f | 53.13 | a | 59.60 | d | 64.92 | e | 62.91 | c | 55.06 | c | 45.08 | f | 29.12 | m | 30.42 | 47.56 | d | |
| 1974 | 23.17 | a | 30.27 | 37.43 | h | 39.56 | d | 51.56 | f | 61.96 | d | 64.84 | c | 61.38 | c | 58.79 | i | 44.00 | g | 35.15 | c | ----- | z | 45.19 | e | |
| 1975 | ----- | z | ----- | z | 27.13 | p | 32.06 | d | 46.70 | k | ----- | z | ----- | z | 61.05 | u | 58.31 | c | 43.09 | d | 35.89 | h | ----- | z | 44.49 | i |
| 1976 | 35.69 | o | 29.33 | e | 34.26 | h | 38.52 | 53.39 | d | 57.33 | a | 64.90 | b | 59.12 | w | 55.81 | c | 44.17 | g | 39.12 | d | 29.41 | c | 45.98 | d | |
| 1977 | 26.22 | a | 33.44 | b | 29.23 | c | 43.12 | b | 43.87 | 61.52 | 65.57 | b | 64.59 | d | 57.82 | b | 48.86 | c | 39.10 | a | 31.90 | e | 45.44 | |||
| 1978 | 27.16 | b | 29.80 | h | 39.40 | f | 38.92 | r | 46.74 | d | 56.44 | e | 63.85 | g | 62.41 | b | 51.83 | a | 50.65 | d | 29.59 | b | 24.61 | 43.68 | d | |
| 1979 | 23.77 | e | 28.90 | d | 34.44 | 40.97 | a | 51.67 | e | 58.42 | e | 65.67 | k | ----- | z | ----- | z | ----- | z | ----- | z | 31.33 | a | 38.50 | e | |
| 1980 | 31.00 | j | 34.39 | f | 30.41 | i | 42.83 | g | 45.50 | f | 54.56 | u | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 27.76 | 31.21 | 33.76 | 39.22 | 49.07 | 58.14 | 65.03 | 63.34 | 55.51 | 46.80 | 35.78 | 28.62 | 44.31 | |||||||||||||
| S.D. | 3.20 | 3.61 | 3.34 | 4.14 | 3.40 | 3.46 | 1.68 | 2.14 | 2.74 | 4.24 | 3.48 | 3.12 | 0.89 | |||||||||||||
| SKEW | 0.13 | 0.25 | 0.74 | -0.73 | -0.07 | 0.29 | 0.17 | -0.26 | 0.01 | -0.55 | -0.41 | -0.53 | -0.05 | |||||||||||||
| MAX | 34.00 | 38.65 | 42.05 | 45.13 | 54.10 | 66.24 | 68.38 | 66.90 | 61.07 | 52.37 | 41.90 | 33.02 | 45.44 | |||||||||||||
| MIN | 23.17 | 25.10 | 29.23 | 30.37 | 43.87 | 51.83 | 62.16 | 58.44 | 50.25 | 39.62 | 29.59 | 22.48 | 43.15 | |||||||||||||
| YRS | 15 | 17 | 15 | 15 | 16 | 18 | 17 | 17 | 17 | 16 | 18 | 16 | 6 | |||||||||||||