| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1959 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 78.83 | x | 89.05 | i | 82.84 | f | 72.40 | j | 70.00 | 58.57 | 50.42 | 59.66 | i | |||
| 1960 | 43.87 | a | 42.85 | b | 50.87 | 60.73 | ----- | z | 81.70 | 85.43 | a | 81.81 | 82.07 | 70.45 | 58.57 | ----- | z | 65.83 | b | |||||||
| 1961 | 50.03 | 54.36 | 47.61 | 52.90 | a | 61.84 | 81.28 | a | 86.53 | a | 80.71 | 76.82 | s | 68.88 | g | 54.86 | a | 44.39 | 61.45 | b | ||||||
| 1962 | 44.52 | 41.75 | d | 42.68 | 61.62 | n | ----- | z | 74.93 | b | 79.79 | b | 81.10 | a | 76.80 | 66.48 | b | 55.82 | b | 48.69 | b | 61.26 | b | |||
| 1963 | 44.77 | 52.71 | 47.13 | a | 50.66 | a | 65.84 | 66.77 | 82.37 | a | 81.00 | b | 76.40 | e | 66.63 | d | 51.52 | a | 47.45 | 61.10 | ||||||
| 1964 | 43.40 | a | 45.68 | a | 46.90 | 53.70 | 63.17 | a | 72.28 | a | 84.31 | b | 81.90 | a | 74.19 | d | 69.48 | b | 45.17 | 42.97 | b | 60.26 | ||||
| 1965 | 44.72 | b | 47.68 | 48.47 | a | 52.63 | 59.77 | a | 70.07 | b | 80.19 | 78.66 | b | 69.73 | 70.26 | 49.23 | 40.52 | 59.33 | ||||||||
| 1966 | 39.45 | 39.54 | 53.16 | 61.77 | 71.06 | 75.50 | 82.90 | 82.48 | 72.70 | 62.19 | 50.20 | 40.87 | 60.99 | |||||||||||||
| 1967 | 43.52 | 46.04 | 48.84 | 42.97 | 64.64 | c | 70.79 | a | 83.06 | 82.31 | b | 71.17 | a | 67.07 | a | 52.34 | a | 35.50 | y | 61.16 | a | |||||
| 1968 | 41.67 | v | 47.93 | 49.65 | 53.00 | d | 64.52 | 77.93 | c | 82.93 | a | 74.48 | 72.80 | 62.74 | 48.33 | 39.33 | a | 61.24 | a | |||||||
| 1969 | 43.79 | g | 37.17 | v | 48.90 | u | 59.25 | v | 71.67 | a | 71.67 | 83.39 | 85.97 | 77.20 | 58.55 | 51.80 | 44.55 | 68.10 | d | |||||||
| 1970 | 40.73 | e | 46.64 | 48.35 | 52.29 | i | 67.93 | c | 74.38 | f | 83.11 | d | 84.28 | b | 73.30 | 59.90 | 49.72 | e | 35.04 | c | 58.90 | b | ||||
| 1971 | 42.84 | 44.54 | 50.65 | 56.33 | 58.48 | 75.27 | 84.90 | 84.10 | b | 72.73 | 55.79 | b | 45.54 | b | 34.75 | g | 61.02 | a | ||||||||
| 1972 | 37.93 | a | 47.32 | a | 59.34 | b | 55.93 | c | 68.32 | c | 75.37 | c | 84.61 | c | 80.97 | b | 69.21 | b | 55.25 | c | 43.92 | d | 37.86 | b | 59.67 | |
| 1973 | 35.73 | i | 38.32 | c | 42.04 | e | 53.96 | e | 69.80 | a | 76.54 | d | 84.38 | e | 80.14 | c | 73.37 | c | 62.92 | f | 41.41 | m | 42.26 | 62.31 | c | |
| 1974 | 34.83 | a | 43.64 | 49.48 | f | 55.19 | d | 68.80 | f | 80.92 | d | 82.00 | c | 80.29 | c | 77.33 | i | 59.00 | f | 48.70 | c | ----- | z | 60.80 | e | |
| 1975 | ----- | z | ----- | z | 40.47 | p | 45.08 | d | 62.70 | k | ----- | z | ----- | z | 80.00 | t | 75.67 | c | 58.81 | d | 50.95 | h | ----- | z | 59.85 | i |
| 1976 | 51.50 | o | 44.71 | e | 48.30 | h | 53.47 | 69.85 | d | 73.21 | a | 82.21 | b | 76.00 | w | 70.44 | c | 60.80 | f | 56.85 | d | 46.93 | c | 62.21 | d | |
| 1977 | 39.42 | 49.15 | b | 44.21 | b | 59.86 | b | 57.16 | 76.30 | 82.59 | b | 80.07 | d | 73.52 | a | 65.89 | c | 55.10 | a | 45.96 | d | 60.77 | ||||
| 1978 | 38.83 | b | 42.38 | g | 52.16 | f | 53.28 | l | 64.10 | b | 74.68 | b | 81.08 | g | 80.07 | a | 68.41 | a | 68.41 | d | 43.14 | b | 37.65 | 59.41 | d | |
| 1979 | 34.35 | e | 41.84 | c | 47.19 | 57.66 | a | 68.07 | c | 77.31 | d | 85.38 | j | ----- | z | ----- | z | ----- | z | ----- | z | 46.23 | a | 53.24 | e | |
| 1980 | 41.43 | h | 46.58 | e | 45.35 | e | 59.26 | g | 60.42 | e | 72.30 | t | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 50.78 | i |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 41.55 | 45.63 | 48.28 | 54.11 | 65.10 | 75.14 | 83.22 | 81.20 | 73.51 | 64.24 | 51.08 | 43.19 | 60.35 | |||||||||||||
| S.D. | 4.16 | 4.11 | 4.17 | 5.04 | 4.50 | 3.98 | 1.73 | 2.51 | 3.41 | 5.25 | 4.85 | 4.39 | 0.73 | |||||||||||||
| SKEW | -0.03 | 0.29 | 0.94 | -0.64 | -0.21 | -0.12 | -0.17 | -0.64 | 0.71 | -0.41 | -0.01 | -0.19 | -0.37 | |||||||||||||
| MAX | 50.03 | 54.36 | 59.34 | 61.77 | 71.67 | 81.70 | 86.53 | 85.97 | 82.07 | 70.45 | 58.57 | 50.42 | 61.10 | |||||||||||||
| MIN | 34.35 | 38.32 | 42.04 | 42.97 | 57.16 | 66.77 | 79.79 | 74.48 | 68.41 | 55.25 | 43.14 | 35.04 | 59.33 | |||||||||||||
| YRS | 15 | 18 | 16 | 16 | 17 | 18 | 17 | 17 | 17 | 16 | 18 | 16 | 6 | |||||||||||||