| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1953 | 76.00 | 76.00 | 77.00 | 78.00 | 81.00 | 84.00 | 88.00 | 85.00 | 85.00 | 82.00 | 80.00 | 77.00 | a | 88.00 | a | |||||||||||
| 1954 | 75.00 | 73.00 | 75.00 | 77.00 | 78.00 | a | 84.00 | 84.00 | 86.00 | b | 85.00 | 84.00 | a | 82.00 | 79.00 | 86.00 | d | |||||||||
| 1955 | 74.00 | 76.00 | 73.00 | 76.00 | 81.00 | 85.00 | 85.00 | 83.00 | 85.00 | 82.00 | a | 79.00 | 77.00 | 85.00 | a | |||||||||||
| 1956 | 73.00 | j | 72.00 | 73.00 | 75.00 | 77.00 | 87.00 | 84.00 | 85.00 | 86.00 | 82.00 | 81.00 | 74.00 | 87.00 | j | |||||||||||
| 1957 | 71.00 | j | 73.00 | 73.00 | 76.00 | 79.00 | 85.00 | 84.00 | j | 84.00 | 84.00 | 78.00 | 78.00 | 75.00 | 85.00 | t | ||||||||||
| 1958 | 74.00 | 73.00 | b | 75.00 | 76.00 | a | 79.00 | 80.00 | 81.00 | 83.00 | j | 84.00 | j | 81.00 | 78.00 | 75.00 | 84.00 | w | ||||||||
| 1959 | 70.00 | 73.00 | 77.00 | 73.00 | 79.00 | 82.00 | 83.00 | 89.00 | 85.00 | 83.00 | 78.00 | 77.00 | 89.00 | |||||||||||||
| 1960 | 76.00 | j | 73.00 | 74.00 | 78.00 | 81.00 | a | 85.00 | 85.00 | a | 86.00 | i | 86.00 | 81.00 | 77.00 | 76.00 | 86.00 | u | ||||||||
| 1961 | 74.00 | 75.00 | 75.00 | 74.00 | 80.00 | 82.00 | 83.00 | 84.00 | 85.00 | 83.00 | 80.00 | 76.00 | 85.00 | |||||||||||||
| 1962 | 73.00 | 72.00 | 74.00 | 73.00 | 79.00 | 82.00 | 82.00 | 87.00 | 88.00 | 82.00 | 80.00 | a | 77.00 | 88.00 | a | |||||||||||
| 1963 | 73.00 | 73.00 | 74.00 | 75.00 | 80.00 | 82.00 | 83.00 | 85.00 | 87.00 | 84.00 | 84.00 | 77.00 | 87.00 | |||||||||||||
| 1964 | 77.00 | 76.00 | 76.00 | 74.00 | 80.00 | 83.00 | 82.00 | 85.00 | 88.00 | 85.00 | 80.00 | 78.00 | 88.00 | |||||||||||||
| 1965 | 72.00 | 74.00 | 73.00 | 74.00 | d | 79.00 | f | 81.00 | 82.00 | 84.00 | 85.00 | j | 82.00 | j | 80.00 | h | 74.00 | b | ----- | z | ||||||
| 1966 | 75.00 | 72.00 | 75.00 | 77.00 | 76.00 | 81.00 | j | 84.00 | 86.00 | 89.00 | 84.00 | 79.00 | 76.00 | j | 89.00 | t | ||||||||||
| 1967 | 78.00 | 75.00 | 72.00 | 75.00 | 80.00 | 83.00 | 83.00 | 85.00 | 88.00 | 86.00 | 83.00 | 77.00 | a | 88.00 | a | |||||||||||
| 1968 | 74.00 | 70.00 | 75.00 | 76.00 | 82.00 | 85.00 | 85.00 | 87.00 | 86.00 | 82.00 | 80.00 | 76.00 | 87.00 | |||||||||||||
| 1969 | 71.00 | 77.00 | 74.00 | 79.00 | 83.00 | 83.00 | 88.00 | 85.00 | 85.00 | 86.00 | 80.00 | 79.00 | b | 88.00 | b | |||||||||||
| 1970 | 75.00 | 75.00 | ----- | z | 82.00 | 86.00 | 88.00 | 85.00 | 87.00 | 87.00 | 82.00 | 82.00 | 80.00 | ----- | z | |||||||||||
| 1971 | 78.00 | 76.00 | ----- | z | 79.00 | 85.00 | 82.00 | 87.00 | 87.00 | 89.00 | ----- | z | 80.00 | 77.00 | ----- | z | ||||||||||
| 1972 | 73.00 | 74.00 | 71.00 | 74.00 | 79.00 | 84.00 | 83.00 | 83.00 | 85.00 | 83.00 | 81.00 | 77.00 | 85.00 | |||||||||||||
| 1973 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1974 | 77.00 | m | 81.00 | g | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 87.00 | l | 87.00 | b | ----- | z | ----- | z | ----- | z | ----- | z |
| 1975 | ----- | z | 77.00 | d | 77.00 | p | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 84.00 | ----- | z | ----- | z | |
| 1976 | 75.00 | u | ----- | z | 79.00 | 74.00 | u | ----- | z | ----- | z | 85.00 | n | ----- | z | 88.00 | ----- | z | 80.00 | x | ----- | z | ----- | z | ||
| 1977 | 76.00 | ----- | z | 76.00 | 80.00 | 81.00 | 85.00 | 84.00 | 86.00 | 87.00 | 83.00 | 80.00 | 79.00 | ----- | z | |||||||||||
| 1978 | ----- | z | 75.00 | 77.00 | 80.00 | 81.00 | 85.00 | 89.00 | ----- | z | 89.00 | 86.00 | 80.00 | ----- | z | ----- | z | |||||||||
| 1979 | 76.00 | 77.00 | 78.00 | ----- | z | 83.00 | 85.00 | ----- | z | ----- | z | 92.00 | 89.00 | 83.00 | ----- | z | ----- | z | ||||||||
| 1980 | ----- | z | ----- | z | 77.00 | 78.00 | 80.00 | 86.00 | 87.00 | 89.00 | a | 88.00 | 89.00 | 84.00 | 78.00 | ----- | z | |||||||||
| 1981 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1982 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 85.00 | s | 84.00 | 78.00 | ----- | z | ||
| 1983 | 74.00 | 75.00 | 76.00 | a | 77.00 | 80.00 | 86.00 | 88.00 | 86.00 | 88.00 | f | 87.00 | 88.00 | d | 82.00 | 88.00 | k | |||||||||
| 1984 | 78.00 | 78.00 | a | 79.00 | 82.00 | ----- | z | 89.00 | 92.00 | 92.00 | 89.00 | 87.00 | 82.00 | n | 77.00 | ----- | z | |||||||||
| 1985 | ----- | z | ----- | z | 76.00 | 79.00 | 83.00 | 87.00 | 88.00 | 87.00 | 88.00 | ----- | z | 82.00 | 78.00 | ----- | z | |||||||||
| 1986 | 77.00 | 75.00 | 77.00 | 78.00 | 79.00 | 84.00 | 86.00 | 87.00 | 88.00 | 87.00 | 83.00 | 80.00 | 88.00 | |||||||||||||
| 1987 | 77.00 | 76.00 | 76.00 | ----- | z | 80.00 | 85.00 | 89.00 | 92.00 | 89.00 | 86.00 | 81.00 | 81.00 | ----- | z | |||||||||||
| 1988 | 77.00 | 75.00 | 79.00 | 79.00 | ----- | z | 88.00 | ----- | z | 89.00 | ----- | z | 86.00 | ----- | z | 80.00 | ----- | z | ||||||||
| 1989 | 80.00 | 75.00 | 76.00 | ----- | z | 80.00 | 85.00 | 86.00 | 89.00 | 91.00 | 83.00 | 80.00 | 78.00 | ----- | z | |||||||||||
| 1990 | 76.00 | 76.00 | 76.00 | 78.00 | 81.00 | 84.00 | 87.00 | b | ----- | z | 89.00 | 87.00 | 82.00 | ----- | z | ----- | z | |||||||||
| 1991 | 75.00 | 73.00 | 75.00 | 79.00 | 81.00 | 84.00 | ----- | z | 89.00 | a | 90.00 | ----- | z | ----- | z | ----- | z | ----- | z | |||||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 75.11 | 74.52 | 75.41 | 77.03 | 80.47 | 84.38 | 85.28 | 86.54 | 87.35 | 84.14 | 81.06 | 77.55 | 87.08 | |||||||||||||
| S.D. | 2.31 | 1.84 | 2.00 | 2.47 | 2.10 | 2.09 | 2.64 | 2.36 | 1.98 | 2.60 | 2.32 | 1.94 | 1.38 | |||||||||||||
| SKEW | -0.16 | -0.30 | -0.06 | 0.16 | 0.57 | 0.16 | 0.50 | 0.69 | 0.26 | -0.01 | 0.75 | 0.23 | -0.54 | |||||||||||||
| MAX | 80.00 | 78.00 | 79.00 | 82.00 | 86.00 | 89.00 | 92.00 | 92.00 | 92.00 | 89.00 | 88.00 | 82.00 | 89.00 | |||||||||||||
| MIN | 70.00 | 70.00 | 71.00 | 73.00 | 76.00 | 80.00 | 81.00 | 83.00 | 84.00 | 78.00 | 77.00 | 74.00 | 85.00 | |||||||||||||
| YRS | 27 | 31 | 32 | 30 | 30 | 32 | 29 | 28 | 31 | 29 | 31 | 29 | 13 | |||||||||||||