YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1968 | ----- | z | ----- | z | 75.48 | 82.47 | 94.94 | 106.17 | 105.26 | 101.58 | 102.20 | 89.35 | 73.38 | a | 62.80 | a | 89.36 | b | ||||||||
1969 | 66.73 | a | 66.04 | a | 71.13 | 84.00 | 94.23 | 99.07 | 104.83 | a | 106.03 | 100.03 | 83.83 | a | 73.85 | c | 67.32 | 84.76 | ||||||||
1970 | 65.50 | a | 74.12 | b | 72.43 | a | 78.90 | 94.06 | 102.23 | 105.44 | d | 103.13 | 94.34 | a | 83.29 | 76.23 | 66.39 | 84.67 | ||||||||
1971 | 68.71 | 72.11 | 79.70 | a | 83.03 | 90.87 | a | 102.14 | i | 106.41 | b | 100.03 | b | 99.00 | c | 81.77 | a | 74.43 | 62.52 | b | 83.51 | a | ||||
1972 | 68.53 | a | 76.78 | b | 88.30 | a | 85.77 | 94.00 | b | 100.25 | b | 107.23 | 102.79 | b | 99.23 | 82.84 | 69.50 | 65.03 | 86.69 | |||||||
1973 | 62.35 | 67.26 | a | 67.28 | b | 81.79 | a | 95.68 | ----- | z | 106.74 | 105.43 | a | ----- | z | ----- | z | 74.63 | 70.03 | b | 81.24 | c | ||||
1974 | 66.55 | b | 72.58 | b | 77.90 | b | 84.89 | c | 95.86 | j | 106.04 | f | 103.00 | d | ----- | z | 98.54 | d | 86.57 | c | 74.75 | b | 62.67 | a | 80.83 | c |
1975 | 64.55 | i | ----- | z | 72.54 | e | 77.77 | d | 90.43 | c | 100.59 | c | 104.69 | b | 105.41 | d | 99.50 | f | 88.62 | e | 77.22 | c | 69.29 | 87.39 | c | |
1976 | 70.66 | b | 74.62 | 74.54 | e | 83.41 | c | 94.63 | a | 104.48 | c | 105.14 | i | 105.14 | b | 95.31 | d | 84.48 | h | 78.00 | d | ----- | z | 86.75 | c | |
1977 | 65.55 | b | 75.93 | a | 74.04 | e | 88.17 | f | 88.17 | b | 106.08 | d | 105.90 | b | 104.74 | 98.38 | a | 92.75 | g | 78.59 | h | 72.16 | f | 89.85 | d | |
1978 | 66.00 | e | 68.52 | c | 76.42 | 82.57 | 92.84 | 105.23 | 106.57 | h | 104.16 | f | 98.83 | 91.70 | a | 72.88 | d | ----- | z | 83.89 | c | |||||
1979 | 63.10 | k | 69.54 | o | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 88.96 | d | 72.70 | 70.52 | 77.39 | i | ||
1980 | 66.97 | 72.07 | 73.42 | 84.77 | 89.48 | 103.97 | 107.58 | 103.17 | a | 99.23 | 88.00 | 78.07 | 74.68 | 86.78 | ||||||||||||
1981 | 70.68 | 74.93 | 74.94 | 88.23 | 91.97 | 105.10 | 105.06 | 105.16 | 100.17 | 85.42 | 79.30 | 70.03 | a | 87.58 | ||||||||||||
1982 | 63.82 | c | 70.07 | 74.39 | 84.23 | 92.67 | a | 100.33 | 104.23 | 104.24 | b | 98.04 | b | 87.84 | 71.60 | 64.39 | 84.65 | |||||||||
1983 | 69.40 | a | 68.57 | 73.03 | 78.93 | c | 93.93 | b | 101.38 | a | 106.47 | a | 103.79 | b | 99.60 | 87.19 | 73.80 | 66.87 | 85.25 | |||||||
1984 | 68.90 | 74.10 | 81.29 | 84.24 | a | 100.55 | 101.73 | 103.32 | 102.90 | 101.00 | a | 83.81 | 74.03 | 64.35 | 86.69 | |||||||||||
1985 | 64.70 | a | 71.04 | 76.87 | 92.61 | b | 97.87 | a | 106.67 | 106.73 | a | 105.76 | b | 97.72 | e | 85.20 | a | 68.00 | c | ----- | z | 88.47 | a | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 67.00 | 71.91 | 75.51 | 83.60 | 93.52 | 103.09 | 105.53 | 103.95 | 98.78 | 86.29 | 74.26 | 66.92 | 85.88 | |||||||||||||
S.D. | 2.45 | 3.27 | 4.63 | 3.61 | 3.08 | 2.57 | 1.37 | 1.69 | 1.98 | 2.84 | 2.97 | 3.61 | 1.17 | |||||||||||||
SKEW | -0.13 | -0.30 | 1.07 | 0.63 | 0.41 | -0.05 | -0.33 | -0.79 | -0.70 | 0.11 | -0.27 | 0.53 | 0.13 | |||||||||||||
MAX | 70.68 | 76.78 | 88.30 | 92.61 | 100.55 | 106.67 | 107.58 | 106.03 | 102.20 | 91.70 | 79.30 | 74.68 | 87.58 | |||||||||||||
MIN | 62.35 | 66.04 | 67.28 | 77.77 | 88.17 | 99.07 | 103.00 | 100.03 | 94.34 | 81.77 | 68.00 | 62.52 | 84.65 | |||||||||||||
YRS | 15 | 15 | 17 | 16 | 16 | 14 | 15 | 15 | 15 | 15 | 17 | 14 | 8 |