YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1955 | 76.10 | 77.30 | 75.76 | 75.53 | 80.98 | 82.62 | 82.73 | 82.60 | 82.35 | 81.37 | 80.82 | 78.53 | 79.72 | |||||||||||||
1956 | 76.63 | 76.22 | 77.42 | g | 78.83 | 79.85 | 80.82 | 82.69 | 82.27 | a | 82.32 | 81.29 | 79.62 | 78.69 | 79.93 | a | ||||||||||
1957 | 77.48 | 77.12 | 75.84 | 77.92 | 80.85 | 81.68 | 82.50 | 82.55 | 82.93 | 82.58 | 80.43 | 78.15 | 80.00 | |||||||||||||
1958 | 76.94 | 77.12 | 79.24 | 80.40 | 79.87 | 81.07 | 81.07 | b | 81.73 | 82.43 | 81.19 | 79.30 | 78.53 | 79.91 | ||||||||||||
1959 | 76.85 | 75.88 | 78.24 | 79.20 | 77.35 | 79.32 | 82.23 | 81.85 | 82.33 | 80.42 | 79.30 | 78.45 | 79.29 | |||||||||||||
1960 | 77.29 | 78.07 | 79.63 | 80.57 | 80.81 | 82.10 | 81.95 | 82.18 | a | 80.92 | 82.26 | 80.98 | 76.31 | 80.26 | ||||||||||||
1961 | 77.32 | 77.38 | 77.56 | 79.65 | 81.05 | 81.67 | 81.16 | 81.84 | 80.92 | 80.06 | 77.33 | 77.08 | 79.42 | |||||||||||||
1962 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1963 | 76.77 | 76.62 | 77.47 | 79.00 | 78.76 | 81.33 | 81.18 | 81.10 | 81.18 | 81.21 | 79.48 | 78.79 | 79.41 | |||||||||||||
1964 | 77.15 | 77.45 | 77.65 | 77.63 | 80.98 | 81.38 | 80.94 | 80.94 | 80.80 | 80.35 | 79.38 | 74.85 | 79.13 | |||||||||||||
1965 | 74.32 | 75.23 | 77.63 | 76.95 | 78.29 | 78.97 | 80.71 | 80.02 | 80.26 | a | 79.90 | 78.15 | 76.13 | 78.05 | ||||||||||||
1966 | 75.66 | 75.66 | 76.16 | 77.65 | 78.42 | 80.17 | 80.94 | 80.77 | 79.63 | 78.95 | 76.95 | 74.81 | 77.98 | |||||||||||||
1967 | 74.35 | a | 73.66 | 73.27 | 74.52 | 76.73 | 79.38 | 78.24 | 79.31 | 78.80 | 77.77 | 76.77 | 74.00 | 76.40 | ||||||||||||
1968 | 72.50 | 72.22 | 73.39 | 72.90 | 76.61 | 77.73 | 76.65 | 77.44 | 78.93 | 78.26 | 76.95 | 73.73 | 75.61 | |||||||||||||
1969 | ----- | z | ----- | z | 78.27 | 81.03 | 81.58 | 82.78 | 82.21 | 82.21 | 81.55 | 82.08 | 80.13 | 78.65 | 81.05 | b | ||||||||||
1970 | 78.00 | 76.16 | 76.18 | 78.78 | 80.66 | 81.55 | 81.39 | 82.19 | 82.23 | 80.94 | 80.62 | 78.61 | 79.78 | |||||||||||||
1971 | 77.66 | 76.21 | 75.53 | 77.48 | 78.94 | 81.35 | 81.55 | 80.88 | b | 81.43 | 79.85 | 77.38 | 74.21 | 78.54 | ||||||||||||
1972 | 72.74 | 74.09 | 77.48 | 77.42 | 81.19 | 81.38 | 79.66 | ----- | z | 80.60 | 77.31 | 79.65 | 78.84 | 78.21 | a | |||||||||||
1973 | 77.03 | 77.04 | 78.35 | 78.68 | 81.32 | 80.85 | 81.19 | 80.71 | 80.72 | 80.39 | 79.67 | 76.92 | 79.41 | |||||||||||||
1974 | 75.52 | 76.41 | 76.87 | 77.65 | 78.85 | 79.13 | 78.18 | 78.44 | 78.70 | 79.03 | 76.62 | 75.68 | 77.59 | |||||||||||||
1975 | 73.47 | 74.52 | 75.16 | 76.60 | 77.85 | 78.27 | 77.11 | 77.21 | 77.27 | 75.97 | 75.17 | 73.32 | 75.99 | |||||||||||||
1976 | 72.53 | 72.98 | 74.71 | 75.57 | 76.18 | 78.23 | 78.56 | 78.34 | 78.47 | ----- | z | ----- | z | ----- | z | 76.17 | c | |||||||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 75.82 | 75.87 | 76.72 | 77.81 | 79.39 | 80.56 | 80.61 | 80.73 | 80.70 | 80.06 | 78.74 | 76.71 | 78.62 | |||||||||||||
S.D. | 1.83 | 1.61 | 1.76 | 2.02 | 1.74 | 1.49 | 1.83 | 1.72 | 1.56 | 1.74 | 1.68 | 1.98 | 1.46 | |||||||||||||
SKEW | -0.74 | -0.83 | -0.38 | -0.58 | -0.42 | -0.44 | -0.88 | -0.84 | -0.53 | -0.69 | -0.47 | -0.38 | -0.90 | |||||||||||||
MAX | 78.00 | 78.07 | 79.63 | 81.03 | 81.58 | 82.78 | 82.73 | 82.60 | 82.93 | 82.58 | 80.98 | 78.84 | 80.26 | |||||||||||||
MIN | 72.50 | 72.22 | 73.27 | 72.90 | 76.18 | 77.73 | 76.65 | 77.21 | 77.27 | 75.97 | 75.17 | 73.32 | 75.61 | |||||||||||||
YRS | 20 | 20 | 20 | 21 | 21 | 21 | 21 | 20 | 21 | 20 | 20 | 20 | 17 |