| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1961 | ----- | z | ----- | z | ----- | z | 94.28 | a | 97.90 | 113.73 | 117.90 | 112.74 | 102.70 | 90.87 | 72.50 | 63.32 | 96.22 | |||||||||
| 1962 | 67.39 | 71.54 | 76.65 | 97.77 | 96.45 | 109.63 | 113.84 | 114.87 | 108.73 | 94.06 | 78.60 | 66.55 | 91.34 | |||||||||||||
| 1963 | 63.00 | 79.71 | 79.71 | 85.67 | 100.16 | 104.37 | 114.03 | 111.90 | 105.70 | 94.55 | 76.63 | 66.16 | 90.13 | |||||||||||||
| 1964 | 64.58 | 72.31 | 78.42 | 88.37 | 97.00 | 106.33 | 115.45 | 112.77 | a | 105.30 | 97.90 | 71.10 | 67.16 | 89.72 | ||||||||||||
| 1965 | 69.13 | 75.96 | 79.90 | 84.07 | 96.19 | 104.77 | 112.10 | 112.06 | 100.33 | 96.35 | 77.47 | 61.17 | a | 89.13 | ||||||||||||
| 1966 | 62.90 | 68.78 | a | 83.58 | 94.47 | 102.45 | 108.53 | 113.45 | 114.23 | 106.07 | 92.33 | a | 76.20 | 66.97 | a | 90.83 | ||||||||||
| 1967 | 66.81 | 76.75 | 82.39 | 78.70 | 98.52 | 104.90 | 117.06 | 117.10 | 104.80 | 95.13 | 79.17 | 62.35 | 90.31 | |||||||||||||
| 1968 | ----- | z | 76.59 | 83.19 | 88.67 | 99.71 | 110.57 | 113.52 | 108.32 | 106.77 | 92.90 | 78.73 | 60.48 | 92.68 | ||||||||||||
| 1969 | 66.68 | 67.00 | 77.10 | 90.30 | 102.42 | 105.33 | 114.81 | 117.23 | 108.63 | 88.23 | 77.33 | 65.00 | 90.00 | |||||||||||||
| 1970 | 64.39 | 74.46 | 79.45 | 84.73 | 101.06 | 109.83 | 116.74 | 116.23 | 104.77 | 89.97 | 76.87 | 62.77 | 90.11 | |||||||||||||
| 1971 | 65.39 | 74.82 | 81.97 | 88.70 | 94.94 | 107.97 | 116.58 | 115.71 | 105.37 | 89.45 | 74.80 | 62.35 | 89.84 | |||||||||||||
| 1972 | 62.81 | 75.28 | 90.48 | 90.80 | 100.55 | 108.60 | 118.26 | 112.23 | 102.80 | 86.29 | 72.17 | 62.39 | 90.22 | |||||||||||||
| 1973 | 62.19 | 71.32 | 74.97 | 88.50 | ----- | z | 111.70 | 117.29 | 113.32 | 104.90 | 92.29 | 74.33 | 67.26 | 88.92 | ||||||||||||
| 1974 | 60.39 | 72.57 | 81.90 | 89.17 | 103.16 | 113.10 | 114.35 | 112.58 | 110.10 | 92.06 | 75.37 | 63.84 | 90.72 | |||||||||||||
| 1975 | 65.32 | 72.54 | 78.13 | 81.73 | 99.03 | 108.90 | 114.65 | 111.77 | 107.13 | 91.29 | 75.83 | 69.97 | 89.69 | |||||||||||||
| 1976 | 69.58 | 72.28 | 79.00 | 86.83 | 101.90 | 107.17 | 114.00 | 107.65 | 101.43 | 91.84 | 78.57 | 63.77 | 89.50 | |||||||||||||
| 1977 | 65.58 | 78.79 | 77.26 | 93.60 | 88.81 | 110.63 | 115.06 | 111.58 | 102.97 | 94.32 | 76.20 | 68.32 | 90.26 | |||||||||||||
| 1978 | 65.42 | 71.46 | 81.10 | 84.97 | 98.03 | 109.33 | 114.94 | 113.19 | 102.33 | 97.26 | 74.23 | 60.58 | 89.40 | |||||||||||||
| 1979 | 59.48 | 68.68 | 79.71 | 89.83 | 100.84 | 110.17 | 115.10 | 109.03 | 109.90 | 94.39 | 74.57 | 67.65 | 89.94 | |||||||||||||
| 1980 | 70.00 | 75.79 | 77.68 | 89.83 | 94.10 | 106.40 | 116.10 | 113.26 | 106.60 | 94.61 | 76.50 | 70.61 | 90.96 | |||||||||||||
| 1981 | 70.48 | 76.11 | 80.29 | 94.90 | 100.90 | 112.53 | 116.00 | 115.06 | 107.23 | 88.19 | 79.80 | 66.45 | 92.33 | |||||||||||||
| 1982 | 65.71 | 72.64 | 76.23 | 86.30 | 99.10 | 105.10 | 110.29 | 111.00 | 100.93 | 88.00 | 72.60 | 64.67 | a | 87.71 | ||||||||||||
| 1983 | 66.90 | 70.50 | 76.32 | 81.93 | 97.45 | 106.40 | 110.58 | 106.74 | 106.40 | 91.19 | 77.20 | 65.58 | 88.10 | |||||||||||||
| 1984 | 69.55 | 74.10 | 82.61 | 87.47 | 104.39 | 107.13 | 113.87 | 110.45 | 107.23 | 86.19 | 74.30 | c | 59.06 | 89.70 | ||||||||||||
| 1985 | 65.16 | 69.39 | 78.32 | 93.80 | 99.48 | 111.30 | 116.19 | 112.10 | 98.50 | 91.52 | 71.20 | 65.84 | 89.40 | |||||||||||||
| 1986 | 70.84 | 75.29 | 87.13 | 89.93 | 100.93 | a | 111.89 | b | 111.39 | 115.55 | 99.67 | 88.00 | e | 81.62 | a | 65.61 | 91.49 | |||||||||
| 1987 | 63.52 | 74.78 | a | 77.87 | 95.30 | 98.26 | 111.03 | 111.26 | 115.03 | 107.97 | 97.90 | 76.90 | 60.61 | 90.87 | ||||||||||||
| 1988 | 63.00 | 77.00 | 83.74 | 87.57 | 98.23 | 106.90 | 118.42 | 113.52 | 105.80 | 101.06 | 78.93 | 67.13 | 91.77 | |||||||||||||
| 1989 | 65.35 | 72.07 | 85.71 | 98.77 | 100.06 | 110.17 | 117.94 | 112.23 | 105.60 | 92.32 | 80.53 | 68.19 | 92.41 | |||||||||||||
| 1990 | 66.94 | 71.79 | 85.71 | 94.80 | 98.45 | 110.60 | 116.97 | 113.16 | 106.83 | 92.45 | 71.60 | 56.45 | 90.48 | |||||||||||||
| 1991 | 60.87 | 79.36 | 73.84 | 87.57 | 94.29 | 104.77 | ----- | z | 112.45 | 108.13 | 98.94 | 78.20 | 66.77 | 87.74 | ||||||||||||
| 1992 | 64.32 | 72.90 | 79.03 | 95.27 | 104.77 | 109.27 | 113.03 | 116.90 | 107.73 | 96.52 | 75.23 | 61.29 | 91.36 | |||||||||||||
| 1993 | 61.03 | 69.82 | 82.32 | 92.40 | 101.00 | 107.20 | 113.19 | 114.13 | 107.47 | 94.16 | 74.23 | 67.81 | 90.40 | |||||||||||||
| 1994 | 68.97 | 69.68 | 87.48 | 92.73 | 99.55 | 114.60 | 118.94 | 118.23 | 107.37 | 90.90 | 71.27 | 66.06 | 92.15 | |||||||||||||
| 1995 | 63.23 | 80.39 | 79.71 | 87.77 | 94.13 | 105.90 | 116.16 | 115.97 | 109.47 | 94.23 | 83.03 | 69.10 | 91.59 | |||||||||||||
| 1996 | 71.13 | 77.34 | 83.94 | 94.00 | 102.26 | 112.73 | 120.03 | 118.29 | 106.50 | 92.45 | 76.47 | 67.29 | 93.54 | |||||||||||||
| 1997 | 69.10 | 76.75 | 88.10 | 90.77 | 107.61 | 109.13 | 113.81 | 116.94 | 106.50 | 91.65 | 77.63 | 64.70 | a | 92.72 | ||||||||||||
| 1998 | 67.61 | 67.79 | 78.71 | 85.13 | 91.42 | 103.43 | 118.23 | 118.35 | 104.80 | 89.97 | 76.00 | 67.55 | b | 89.08 | ||||||||||||
| 1999 | 69.48 | 73.21 | 83.03 | 84.33 | 98.00 | 108.13 | 112.65 | 112.87 | 106.47 | 96.13 | 79.53 | 69.65 | 91.12 | |||||||||||||
| 2000 | 69.39 | 74.41 | 81.61 | 95.90 | 105.35 | 113.70 | 116.35 | 115.94 | 105.79 | a | 92.16 | 73.20 | 68.03 | 92.65 | ||||||||||||
| 2001 | 64.26 | 67.79 | 84.23 | 88.13 | 107.58 | 113.00 | 115.42 | 118.32 | 110.73 | 96.52 | 80.37 | 65.84 | 92.68 | |||||||||||||
| 2002 | 67.48 | 76.11 | 81.03 | 93.77 | 100.52 | 113.63 | 120.58 | 115.45 | 108.50 | 92.13 | 80.73 | 66.94 | 93.07 | |||||||||||||
| 2003 | 74.32 | 72.50 | 82.53 | a | 85.23 | 100.87 | 113.00 | 120.58 | 114.00 | 110.67 | 100.45 | 70.43 | 62.65 | 92.27 | ||||||||||||
| 2004 | 66.26 | 69.72 | 89.84 | 92.30 | 101.23 | 112.17 | 117.13 | 113.67 | a | 105.90 | 90.03 | 73.73 | ----- | z | 93.82 | |||||||||||
| 2005 | 66.26 | 70.21 | 80.58 | 88.03 | 100.90 | 106.80 | 120.16 | 114.97 | 102.60 | 91.74 | 79.50 | 65.26 | 90.58 | |||||||||||||
| 2006 | 68.65 | 76.36 | 77.27 | a | 87.83 | 104.90 | 114.60 | 119.90 | j | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 88.27 | ||||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 66.16 | 73.44 | 81.11 | 89.63 | 99.66 | 109.28 | 115.55 | 113.76 | 105.83 | 92.91 | 76.25 | 65.16 | 90.74 | |||||||||||||
| S.D. | 3.24 | 3.40 | 3.86 | 4.47 | 3.81 | 3.10 | 2.63 | 2.80 | 2.89 | 3.50 | 3.10 | 3.12 | 1.35 | |||||||||||||
| SKEW | 0.09 | 0.07 | 0.52 | -0.09 | -0.36 | -0.04 | 0.03 | -0.33 | -0.58 | 0.29 | -0.02 | -0.62 | 0.21 | |||||||||||||
| MAX | 74.32 | 80.39 | 90.48 | 98.77 | 107.61 | 114.60 | 120.58 | 118.35 | 110.73 | 101.06 | 83.03 | 70.61 | 93.54 | |||||||||||||
| MIN | 59.48 | 67.00 | 73.84 | 78.70 | 88.81 | 103.43 | 110.29 | 106.74 | 98.50 | 86.19 | 70.43 | 56.45 | 87.71 | |||||||||||||
| NO YRS | 44 | 45 | 45 | 46 | 45 | 46 | 44 | 45 | 45 | 45 | 45 | 44 | 40 | |||||||||||||