| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1951 | 45.15 | d | 47.46 | b | 53.21 | c | 70.25 | b | 73.52 | f | ----- | z | 94.43 | c | 89.54 | e | 86.11 | b | 66.23 | e | 52.39 | b | 39.23 | 64.40 | b | |
| 1952 | 36.79 | c | 43.96 | c | 47.35 | 68.33 | 75.39 | 78.23 | 92.19 | 91.54 | e | 86.50 | h | 76.27 | a | 48.89 | b | 41.47 | a | 63.67 | a | |||||
| 1953 | 50.32 | 52.88 | b | 59.22 | d | 65.46 | f | 65.86 | b | 78.44 | c | 95.00 | a | 88.19 | d | 88.70 | c | 69.78 | d | 57.41 | a | 46.19 | 68.36 | a | ||
| 1954 | 48.03 | 56.39 | 53.31 | b | 70.53 | 81.90 | 82.14 | a | 94.77 | 87.61 | 82.80 | 71.26 | 59.14 | a | 40.55 | 69.04 | ||||||||||
| 1955 | 34.74 | 44.54 | 55.30 | a | 58.63 | 74.41 | b | 85.00 | a | 89.28 | b | 95.90 | a | 84.24 | a | 73.27 | a | 52.18 | b | 46.03 | 66.13 | |||||
| 1956 | 44.03 | 39.66 | 59.07 | c | 66.00 | b | 75.72 | b | 85.13 | 93.23 | 89.68 | 85.96 | b | 67.61 | 55.43 | 45.90 | 67.29 | |||||||||
| 1957 | 37.70 | a | 51.82 | 56.90 | b | 64.07 | 71.35 | 88.87 | 92.89 | m | 91.43 | q | 85.57 | ----- | z | ----- | z | ----- | z | 65.18 | e | |||||
| 1958 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1959 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1960 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1961 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1962 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1963 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1964 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1965 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1966 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1967 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1968 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1969 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1970 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1971 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1972 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1973 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1974 | 41.90 | b | 50.75 | 56.29 | 61.80 | 75.84 | 88.63 | 90.42 | 90.39 | 85.20 | 68.00 | 54.50 | 43.87 | 67.30 | ||||||||||||
| 1975 | 43.32 | 46.21 | 51.77 | 55.07 | 74.61 | ----- | z | ----- | z | ----- | z | ----- | z | 57.91 | t | 53.23 | 49.58 | 53.40 | e | |||||||
| 1976 | 48.65 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 48.65 | k | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 43.06 | 48.19 | 54.71 | 64.34 | 74.39 | 83.78 | 92.76 | 90.41 | 85.51 | 70.34 | 54.15 | 44.10 | 67.44 | |||||||||||||
| S.D. | 5.30 | 5.22 | 3.77 | 5.57 | 4.52 | 4.37 | 2.24 | 2.75 | 1.82 | 3.53 | 3.22 | 3.48 | 1.20 | |||||||||||||
| SKEW | -0.23 | -0.03 | -0.60 | -0.43 | -0.36 | -0.16 | -0.50 | 1.15 | 0.32 | 0.53 | 0.01 | 0.03 | 0.41 | |||||||||||||
| MAX | 50.32 | 56.39 | 59.22 | 70.53 | 81.90 | 88.87 | 95.00 | 95.90 | 88.70 | 76.27 | 59.14 | 49.58 | 69.04 | |||||||||||||
| MIN | 34.74 | 39.66 | 47.35 | 55.07 | 65.86 | 78.23 | 89.28 | 87.61 | 82.80 | 66.23 | 48.89 | 39.23 | 66.13 | |||||||||||||
| YRS | 10 | 9 | 9 | 8 | 8 | 7 | 7 | 7 | 7 | 7 | 8 | 8 | 4 | |||||||||||||