| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 107.84 | 107.42 | 101.90 | 87.16 | 68.59 | c | 59.74 | 88.78 | ||||||
| 1949 | 48.42 | 61.89 | 73.90 | 87.80 | 90.84 | 102.10 | 108.39 | 106.03 | 103.57 | 84.61 | 80.20 | 61.94 | 84.14 | |||||||||||||
| 1950 | 60.23 | 72.21 | 77.81 | 89.20 | 93.52 | 102.73 | 105.39 | 108.23 | 97.73 | 93.48 | 77.73 | 70.81 | 87.42 | |||||||||||||
| 1951 | 62.97 | 68.00 | a | 74.97 | 82.97 | 92.81 | 101.93 | 109.26 | 102.77 | 101.97 | 85.19 | 69.37 | 58.29 | 84.21 | ||||||||||||
| 1952 | 58.61 | 66.93 | 67.26 | 82.47 | 97.13 | 100.50 | 107.35 | 107.87 | 101.43 | 94.90 | 67.93 | 62.48 | 84.57 | |||||||||||||
| 1953 | 69.32 | 68.18 | 76.97 | 82.70 | 85.29 | 101.77 | 107.90 | 104.68 | 103.23 | 86.42 | 74.23 | 62.68 | 85.28 | |||||||||||||
| 1954 | 63.23 | 75.75 | 71.55 | 89.87 | 96.35 | 100.43 | 108.45 | 104.32 | 102.60 | 90.19 | 76.87 | 62.65 | 86.85 | |||||||||||||
| 1955 | 56.94 | 63.07 | 75.45 | 79.55 | j | 89.74 | 101.60 | 104.19 | 102.35 | 101.70 | 91.68 | 73.40 | 67.40 | a | 84.32 | |||||||||||
| 1956 | 67.65 | 65.52 | 78.90 | 83.37 | 94.13 | 104.80 | 105.77 | 105.74 | 105.13 | 86.13 | 72.40 | 66.00 | 86.29 | |||||||||||||
| 1957 | 60.42 | 73.82 | 76.90 | 82.80 | 89.61 | 105.87 | 107.81 | 101.42 | 100.23 | 80.39 | 65.53 | 64.61 | 84.12 | |||||||||||||
| 1958 | 64.55 | 69.18 | 68.48 | 82.07 | 98.90 | 103.90 | 109.26 | 108.13 | 100.33 | 90.42 | 73.23 | 70.19 | 86.55 | |||||||||||||
| 1959 | 65.52 | 66.29 | 78.87 | 89.57 | 91.71 | 107.07 | 111.39 | 104.00 | 97.83 | 88.58 | 72.93 | 62.39 | 86.34 | |||||||||||||
| 1960 | 58.23 | 62.83 | 79.81 | 86.70 | 94.94 | 108.67 | 110.97 | 107.55 | 100.90 | 86.35 | 71.77 | 63.29 | 86.00 | |||||||||||||
| 1961 | 66.26 | 71.04 | 75.94 | 86.40 | 91.71 | 107.17 | a | 109.55 | 105.13 | 96.67 | 85.84 | 68.47 | 61.74 | 85.49 | ||||||||||||
| 1962 | 63.84 | 68.43 | 71.19 | 91.60 | 90.19 | 102.67 | 108.39 | 109.58 | 102.17 | 88.84 | 77.97 | 66.58 | 86.79 | |||||||||||||
| 1963 | 61.23 | 75.39 | 75.58 | 79.80 | 96.10 | 98.43 | 109.65 | ----- | z | 101.30 | 89.71 | 73.43 | 64.84 | 84.13 | ||||||||||||
| 1964 | 61.55 | 65.79 | 72.65 | 81.10 | 90.94 | 100.97 | ----- | z | 105.58 | 99.37 | 93.84 | 68.63 | 63.77 | 82.20 | ||||||||||||
| 1965 | 65.45 | 68.89 | 71.87 | 78.83 | 88.45 | 96.50 | 107.00 | 107.10 | 94.70 | 92.32 | 72.17 | 60.10 | 83.62 | |||||||||||||
| 1966 | 59.94 | 63.43 | 77.94 | 87.93 | 97.39 | 103.63 | 108.13 | 108.19 | 101.37 | 86.52 | 74.43 | 63.77 | 86.06 | |||||||||||||
| 1967 | 64.97 | 72.21 | 77.81 | 75.50 | 93.45 | 100.63 | 109.29 | 109.55 | 98.57 | 91.29 | 77.03 | 59.10 | 85.78 | |||||||||||||
| 1968 | 65.16 | 75.03 | 78.42 | 83.13 | 95.90 | 106.67 | 108.13 | 103.06 | 101.13 | 88.71 | 73.97 | 59.97 | 86.61 | |||||||||||||
| 1969 | 65.68 | 65.64 | 74.26 | 85.13 | 97.13 | 100.73 | 108.26 | 110.71 | 101.53 | 83.00 | 73.57 | 66.65 | 86.02 | |||||||||||||
| 1970 | 63.16 | 72.96 | 74.03 | 79.47 | 96.06 | 104.57 | 110.10 | 107.16 | 97.93 | 84.03 | 74.47 | 61.06 | 85.42 | |||||||||||||
| 1971 | 65.35 | 70.36 | 78.26 | 83.27 | 87.16 | 102.63 | 110.74 | 103.84 | 98.57 | 81.35 | 70.90 | 58.68 | 84.26 | |||||||||||||
| 1972 | 62.52 | 74.28 | 86.68 | 85.83 | 94.87 | 103.47 | 111.97 | 104.71 | 97.87 | 80.29 | 68.30 | 60.10 | 85.91 | |||||||||||||
| 1973 | 59.74 | 65.71 | 67.32 | 81.40 | 96.94 | 105.33 | 109.90 | 105.68 | 99.00 | 88.29 | 71.60 | 65.32 | 84.69 | |||||||||||||
| 1974 | 58.48 | 67.86 | 77.00 | 83.27 | 94.55 | 108.40 | 105.58 | 105.81 | 101.33 | 87.23 | 72.70 | 60.26 | 85.21 | |||||||||||||
| 1975 | 63.26 | 67.14 | 71.32 | 75.40 | 91.39 | 101.77 | 108.35 | 107.48 | 100.93 | 85.77 | 72.63 | 66.29 | 84.31 | |||||||||||||
| 1976 | 67.68 | 70.83 | 73.55 | 80.67 | 95.52 | 102.70 | 106.61 | 105.10 | 93.30 | 83.39 | 74.17 | 64.29 | 84.82 | |||||||||||||
| 1977 | 62.23 | 74.32 | 70.87 | 87.53 | 85.48 | 105.70 | 108.94 | 105.74 | 99.40 | 92.50 | w | 77.73 | 68.26 | 86.02 | ||||||||||||
| 1978 | 62.55 | 68.46 | 76.53 | a | 82.20 | 94.61 | 106.93 | 110.81 | 107.94 | 99.40 | 93.52 | 71.27 | 58.94 | 86.10 | ||||||||||||
| 1979 | 55.84 | 66.96 | 73.90 | 85.93 | 94.52 | b | 104.70 | 109.23 | 103.58 | 105.93 | 91.71 | 72.43 | b | 67.86 | i | 87.70 | ||||||||||
| 1980 | 64.79 | b | 71.62 | 73.00 | 84.97 | 86.58 | 103.03 | a | 109.97 | a | 106.44 | f | ----- | z | 89.00 | b | 76.60 | 71.97 | 83.15 | |||||||
| 1981 | 69.10 | 72.75 | 75.48 | 89.50 | 92.56 | d | 107.07 | 109.03 | 108.52 | 100.07 | 83.03 | 77.90 | a | 67.76 | b | 87.73 | ||||||||||
| 1982 | 63.74 | 70.96 | 73.55 | 83.86 | a | 91.94 | 100.27 | 104.87 | 104.61 | 97.70 | 82.81 | 69.33 | 60.71 | 83.70 | ||||||||||||
| 1983 | 65.94 | 68.50 | 74.16 | 78.80 | 92.97 | 100.90 | 106.42 | 101.16 | 100.47 | 86.19 | 74.27 | 65.87 | 84.64 | |||||||||||||
| 1984 | 66.61 | 71.24 | 80.48 | 84.53 | 99.94 | 101.57 | 105.26 | 103.94 | 101.47 | 82.52 | 72.33 | 60.10 | 85.83 | |||||||||||||
| 1985 | 62.00 | 67.61 | 75.19 | 89.90 | 95.71 | 106.37 | 109.94 | 108.48 | 93.53 | 86.68 | 70.23 | 66.00 | 85.97 | |||||||||||||
| 1986 | 71.61 | 73.43 | 82.52 | 85.87 | 95.32 | 106.63 | 105.06 | 107.55 | 93.32 | k | 83.16 | l | 75.27 | 63.18 | i | 89.25 | ||||||||||
| 1987 | 62.05 | j | 70.68 | 73.50 | i | 88.25 | j | 93.16 | 106.57 | i | 106.65 | k | 107.30 | k | 101.37 | 92.19 | 71.47 | 61.19 | j | 85.77 | ||||||
| 1988 | 62.87 | 72.48 | 80.03 | 82.27 | 92.87 | 103.53 | 110.23 | 104.23 | 98.90 | 95.03 | 75.23 | 65.32 | 86.92 | |||||||||||||
| 1989 | 62.58 | 71.11 | 84.68 | 93.23 | 95.55 | 104.40 | 111.10 | 105.29 | 101.43 | 88.61 | 77.30 | 67.58 | 88.57 | |||||||||||||
| 1990 | 64.13 | 68.68 | 80.61 | 86.77 | 91.81 | 105.20 | 107.42 | 104.71 | 100.53 | 89.90 | 75.87 | 60.90 | 86.38 | |||||||||||||
| 1991 | 63.19 | 76.39 | 70.74 | ----- | z | 92.16 | 100.23 | 108.74 | 107.52 | 100.93 | 93.32 | 75.13 | 63.45 | 86.53 | ||||||||||||
| 1992 | 64.03 | 71.52 | 74.65 | 89.80 | 96.55 | 103.43 | 107.00 | 107.77 | 103.60 | 91.55 | 70.57 | 59.10 | 86.63 | |||||||||||||
| 1993 | 61.71 | 66.43 | 78.97 | 88.33 | 97.32 | 103.70 | 106.32 | 107.42 | 102.33 | 89.74 | 71.13 | 65.71 | 86.59 | |||||||||||||
| 1994 | 69.42 | 66.29 | 81.97 | 87.33 | 93.68 | 109.30 | 110.35 | 111.00 | 103.23 | 87.10 | 67.40 | 64.13 | 87.60 | |||||||||||||
| 1995 | 63.03 | 75.46 | 75.29 | 83.83 | 90.03 | 102.03 | 110.42 | 110.55 | 104.13 | 92.03 | 81.13 | 67.55 | 87.96 | |||||||||||||
| 1996 | 69.55 | 74.86 | 81.00 | 90.13 | 97.97 | 106.93 | 111.48 | 109.74 | 98.90 | 88.42 | 75.00 | 66.00 | 89.17 | |||||||||||||
| 1997 | 65.55 | 71.14 | 85.16 | 84.67 | 101.23 | 102.40 | 108.19 | 108.23 | 101.03 | 87.87 | 75.20 | 62.39 | 87.75 | |||||||||||||
| 1998 | 66.74 | 64.93 | 76.16 | 80.60 | 89.61 | 100.80 | 111.77 | 110.74 | 99.33 | 86.74 | 74.10 | 65.87 | 85.62 | |||||||||||||
| 1999 | 69.55 | 73.50 | 80.48 | 80.23 | 94.87 | 104.03 | 106.03 | 107.48 | 102.13 | 93.55 | 79.37 | 68.26 | 88.29 | |||||||||||||
| 2000 | 69.87 | 73.38 | 77.06 | 92.93 | 102.03 | 107.67 | 110.29 | 108.03 | 102.70 | 86.71 | 68.60 | 68.42 | 88.97 | |||||||||||||
| 2001 | 61.03 | 65.11 | 77.06 | 82.47 | 101.61 | 106.54 | b | 108.39 | 108.90 | 105.10 | 91.10 | 76.37 | 61.39 | 87.09 | ||||||||||||
| 2002 | 63.58 | 72.25 | 75.35 | 88.00 | 94.84 | 107.50 | 111.10 | 108.48 | 101.97 | 85.42 | 74.73 | 64.45 | 87.31 | |||||||||||||
| 2003 | 72.16 | 66.89 | 75.90 | 80.67 | 96.19 | 104.93 | 111.10 | 106.71 | 103.77 | 94.61 | 68.07 | 63.90 | 87.08 | |||||||||||||
| 2004 | 65.03 | 64.97 | 76.73 | t | 84.57 | 96.68 | 104.60 | 109.00 | 105.52 | 100.90 | 86.03 | 69.43 | 65.06 | 86.53 | ||||||||||||
| 2005 | 65.55 | 67.86 | 77.00 | 85.97 | 98.97 | 105.27 | 114.32 | 108.16 | 102.27 | 88.84 | 77.13 | 67.35 | 88.22 | |||||||||||||
| 2006 | 69.06 | 74.93 | 73.81 | 86.73 | 101.39 | 111.00 | 112.77 | 109.32 | 99.17 | 85.29 | c | 75.80 | 64.00 | 88.61 | ||||||||||||
| 2007 | 62.00 | 71.89 | 82.68 | 87.63 | 97.42 | 106.97 | 110.65 | 109.00 | 100.20 | 87.58 | 78.27 | 60.06 | 87.86 | |||||||||||||
| 2008 | 60.84 | 68.76 | 78.71 | 86.67 | 91.71 | 107.90 | 109.65 | 107.58 | 103.10 | 90.29 | 76.83 | 60.77 | 86.90 | |||||||||||||
| 2009 | 67.32 | 67.50 | 77.65 | 84.80 | 101.74 | 100.23 | 111.77 | 108.48 | 103.67 | 84.84 | 76.33 | 60.35 | 87.06 | |||||||||||||
| 2010 | 64.68 | 68.43 | 73.81 | 81.60 | 90.06 | 104.80 | 110.97 | 107.97 | 104.93 | 86.39 | 72.63 | 65.77 | 86.00 | |||||||||||||
| 2011 | 65.42 | 66.14 | 78.68 | 85.27 | 91.03 | 104.37 | 108.10 | 111.45 | 102.83 | 90.32 | 72.13 | 61.81 | 86.46 | |||||||||||||
| 2012 | 69.19 | 71.97 | 79.39 | 88.27 | 99.55 | 108.00 | 107.06 | 109.32 | 103.97 | 90.10 | 78.10 | 64.35 | 89.11 | |||||||||||||
| 2013 | 62.29 | 68.64 | 83.48 | 83.00 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 55.00 | z | 71.47 | ||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 63.99 | 69.64 | 76.52 | 84.82 | 94.26 | 104.07 | 108.88 | 106.84 | 100.87 | 88.17 | 73.53 | 63.85 | 86.35 | |||||||||||||
| S.D. | 4.02 | 3.62 | 4.10 | 3.90 | 3.95 | 2.90 | 2.12 | 2.41 | 2.60 | 3.66 | 3.47 | 3.25 | 1.44 | |||||||||||||
| SKEW | -0.76 | -0.04 | 0.09 | -0.12 | -0.10 | -0.14 | -0.13 | -0.35 | -0.72 | -0.07 | -0.11 | 0.26 | 0.13 | |||||||||||||
| MAX | 72.16 | 76.39 | 86.68 | 93.23 | 102.03 | 111.00 | 114.32 | 111.45 | 105.93 | 95.03 | 81.13 | 71.97 | 89.17 | |||||||||||||
| MIN | 48.42 | 61.89 | 67.26 | 75.40 | 85.29 | 96.50 | 104.19 | 101.16 | 93.30 | 80.29 | 65.53 | 58.29 | 83.62 | |||||||||||||
| NO YRS | 64 | 65 | 63 | 61 | 64 | 63 | 63 | 62 | 63 | 63 | 65 | 62 | 54 | |||||||||||||