YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1955 | 67.52 | 69.71 | 67.00 | 64.80 | 72.65 | 75.60 | 75.48 | 75.81 | 75.00 | 73.81 | 73.87 | 71.00 | 71.85 | |||||||||||||
1956 | 68.52 | 68.93 | 69.67 | g | 71.93 | 72.23 | 74.27 | 75.23 | 74.67 | a | 74.87 | 74.48 | 72.13 | 71.81 | 72.64 | a | ||||||||||
1957 | 70.32 | 70.04 | 66.81 | 68.87 | 73.42 | 74.93 | 75.48 | 75.03 | 75.43 | 73.94 | 72.87 | 71.06 | 72.35 | |||||||||||||
1958 | 69.55 | 69.07 | 69.84 | 72.00 | 71.71 | 72.23 | 72.42 | 73.23 | 74.23 | 73.52 | 71.13 | 70.03 | 71.58 | |||||||||||||
1959 | 68.23 | 66.57 | 69.48 | 69.87 | 68.16 | 69.30 | 72.94 | 72.39 | 72.80 | 70.87 | 69.73 | 69.23 | 69.96 | |||||||||||||
1960 | 67.87 | 68.07 | 71.06 | 72.73 | 73.90 | 75.33 | 74.65 | 74.61 | 73.80 | 74.19 | 71.90 | 67.68 | 72.15 | |||||||||||||
1961 | 69.39 | 68.43 | 68.58 | 72.17 | 74.06 | 74.00 | 73.06 | 73.68 | 72.63 | 72.81 | 69.60 | 69.68 | 71.51 | |||||||||||||
1962 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1963 | 68.16 | 68.43 | 69.00 | 71.23 | 70.97 | 73.50 | 72.39 | 72.97 | 73.17 | 72.97 | 70.13 | 70.13 | 71.09 | |||||||||||||
1964 | 68.16 | 69.21 | 68.87 | 69.17 | 73.10 | 73.33 | 73.10 | 73.00 | 72.97 | 71.71 | 70.03 | 65.94 | 70.71 | |||||||||||||
1965 | 65.58 | 65.96 | 68.26 | 67.77 | 70.16 | 71.10 | 71.77 | 71.16 | 71.10 | 70.52 | 68.73 | 66.74 | 69.07 | |||||||||||||
1966 | 65.90 | 65.96 | 66.23 | 67.67 | 69.32 | 70.30 | 71.74 | 71.10 | 68.97 | 68.45 | 65.83 | 64.32 | 67.98 | |||||||||||||
1967 | 63.48 | 61.79 | 61.10 | 62.37 | 65.71 | 68.00 | 67.39 | 67.71 | 67.00 | 65.87 | 64.83 | 62.06 | 64.78 | |||||||||||||
1968 | 59.84 | 57.66 | 60.48 | 59.60 | 64.00 | 65.53 | 64.26 | 65.03 | 66.27 | 64.77 | 63.33 | 60.61 | 62.62 | |||||||||||||
1969 | ----- | z | ----- | z | 68.19 | 71.60 | 74.00 | 74.70 | 73.84 | 73.87 | 72.77 | 73.13 | 72.07 | 70.19 | 72.44 | b | ||||||||||
1970 | 67.94 | 64.43 | 63.84 | 67.87 | 70.87 | 73.03 | 73.81 | 73.65 | 73.13 | 72.35 | 70.93 | 69.13 | 70.08 | |||||||||||||
1971 | 67.81 | 66.07 | 64.65 | 67.57 | 68.87 | 72.80 | 72.87 | 71.23 | 70.57 | 70.03 | 66.13 | 62.55 | 68.43 | |||||||||||||
1972 | 62.77 | 63.52 | 66.19 | 63.33 | 70.77 | 72.27 | 68.90 | ----- | z | 69.87 | 65.84 | 72.67 | 72.52 | 68.06 | a | |||||||||||
1973 | 69.81 | 68.89 | 70.19 | 69.97 | 74.19 | 72.60 | 72.97 | 72.81 | 72.77 | 71.71 | 71.90 | 70.13 | 71.49 | |||||||||||||
1974 | 69.97 | 70.21 | 68.87 | 67.37 | 67.74 | 68.43 | 67.45 | 67.71 | 69.00 | 70.06 | 67.93 | 66.55 | 68.44 | |||||||||||||
1975 | 64.45 | 64.71 | 65.19 | 66.83 | 67.42 | 67.93 | 66.81 | 66.71 | 66.90 | 66.26 | 65.10 | 64.19 | 66.04 | |||||||||||||
1976 | 63.55 | 63.97 | 65.61 | 65.53 | 65.00 | 66.93 | 67.58 | 67.48 | 67.63 | ----- | z | ----- | z | ----- | z | 65.92 | c | |||||||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 66.94 | 66.58 | 66.97 | 68.11 | 70.39 | 71.72 | 71.63 | 71.69 | 71.47 | 70.86 | 69.54 | 67.78 | 69.42 | |||||||||||||
S.D. | 2.83 | 3.21 | 2.87 | 3.51 | 3.14 | 2.98 | 3.23 | 3.12 | 2.88 | 3.10 | 3.06 | 3.49 | 2.78 | |||||||||||||
SKEW | -0.94 | -1.13 | -0.81 | -0.71 | -0.53 | -0.58 | -0.79 | -0.76 | -0.47 | -0.73 | -0.59 | -0.62 | -1.09 | |||||||||||||
MAX | 70.32 | 70.21 | 71.06 | 72.73 | 74.19 | 75.60 | 75.48 | 75.81 | 75.43 | 74.48 | 73.87 | 72.52 | 72.35 | |||||||||||||
MIN | 59.84 | 57.66 | 60.48 | 59.60 | 64.00 | 65.53 | 64.26 | 65.03 | 66.27 | 64.77 | 63.33 | 60.61 | 62.62 | |||||||||||||
YRS | 20 | 20 | 20 | 21 | 21 | 21 | 21 | 20 | 21 | 20 | 20 | 20 | 17 |