YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1952 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 97.37 | 103.84 | 104.68 | 100.83 | 95.74 | 70.00 | 62.77 | 90.75 | e | |||||||
1953 | 71.39 | 69.00 | 76.39 | 79.97 | 83.29 | 98.53 | 103.39 | 102.97 | 101.80 | 87.61 | 77.57 | 67.48 | 84.95 | |||||||||||||
1954 | 67.35 | 78.07 | 71.52 | 88.60 | 92.65 | 97.90 | 102.97 | 100.90 | 99.20 | 91.13 | a | 79.77 | 67.58 | 86.47 | ||||||||||||
1955 | 58.42 | 64.89 | 75.42 | 80.34 | a | 87.45 | 98.50 | 99.87 | 98.73 | a | 99.21 | b | 91.90 | 74.93 | 70.77 | a | 83.37 | |||||||||
1956 | 70.77 | 65.17 | 79.61 | 79.93 | 91.52 | 101.30 | 100.81 | 102.61 | 102.93 | 86.10 | 76.24 | a | 68.97 | 85.50 | ||||||||||||
1957 | 62.10 | 74.93 | 75.48 | 81.14 | a | 85.61 | 101.67 | 105.90 | 100.81 | 99.33 | 81.84 | 68.90 | 69.84 | 83.96 | ||||||||||||
1958 | 68.03 | 70.96 | a | 67.65 | 81.52 | a | 95.87 | 100.43 | 105.29 | 102.32 | 97.73 | 90.10 | 75.40 | 75.58 | 85.91 | |||||||||||
1959 | 70.61 | 66.86 | 79.39 | 87.97 | 89.39 | 103.20 | 106.06 | 100.00 | 96.00 | 89.84 | 77.67 | 66.84 | 86.15 | |||||||||||||
1960 | 61.48 | 64.83 | 80.68 | 87.20 | 91.81 | 105.17 | 106.39 | 103.83 | a | 99.90 | 85.80 | a | 74.20 | 66.84 | 85.68 | |||||||||||
1961 | 69.84 | 72.14 | 74.55 | 84.53 | 88.45 | 103.13 | 103.84 | 100.71 | 94.40 | 86.00 | 70.37 | 64.26 | 84.35 | |||||||||||||
1962 | 65.35 | 67.04 | 69.71 | 89.17 | 86.87 | 98.90 | 104.39 | 106.26 | 97.63 | 88.32 | 79.30 | 69.32 | 85.19 | |||||||||||||
1963 | 63.32 | 76.86 | 73.97 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 71.38 | i | |||
1964 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 94.83 | 91.45 | 69.47 | 66.13 | 80.47 | h | ||||
1965 | 66.71 | 69.07 | 69.81 | 77.80 | 86.00 | 91.83 | 102.23 | 102.32 | 93.43 | 92.58 | 74.67 | 62.68 | 82.43 | |||||||||||||
1966 | 60.67 | a | 62.89 | 76.19 | 86.07 | 92.77 | 99.33 | 102.71 | 102.35 | 95.73 | 85.52 | 77.09 | h | ----- | z | 86.42 | b | |||||||||
1967 | 66.87 | 72.86 | 75.72 | m | 77.05 | h | 89.84 | 95.23 | 103.19 | 103.29 | 92.70 | 90.43 | a | 78.45 | a | 58.60 | f | 88.10 | c | |||||||
1968 | 66.58 | s | 72.72 | k | 75.70 | h | ----- | z | ----- | z | ----- | z | ----- | z | 97.11 | m | 98.83 | g | ----- | z | 72.35 | g | 61.65 | k | ----- | z |
1969 | ----- | z | 61.50 | r | ----- | z | 81.96 | g | 92.30 | a | 95.27 | ----- | z | 105.41 | d | 99.07 | b | 82.77 | 71.80 | 67.10 | 87.67 | e | ||||
1970 | 65.80 | a | 71.32 | 71.39 | 77.47 | 91.74 | ----- | z | 104.71 | 101.89 | c | ----- | z | 83.00 | a | 75.03 | 64.61 | 80.70 | b | |||||||
1971 | 67.35 | 70.68 | 79.16 | ----- | z | 84.40 | a | 97.67 | 105.13 | 98.13 | 96.90 | 79.19 | 72.40 | 60.35 | 82.85 | a | ||||||||||
1972 | 68.73 | a | 74.72 | 84.90 | 85.30 | 90.03 | 98.53 | 105.65 | 100.06 | 95.00 | 78.74 | 69.40 | 66.68 | 84.81 | ||||||||||||
1973 | ----- | z | ----- | z | 65.96 | d | 80.03 | ----- | z | 101.80 | 104.94 | 102.84 | 97.31 | a | 88.68 | 73.10 | 68.77 | 87.05 | c | |||||||
1974 | 63.10 | 69.29 | 76.06 | 83.27 | 91.84 | 105.40 | 101.48 | 102.65 | 97.27 | 86.73 | a | 74.53 | 64.29 | 84.66 | ||||||||||||
1975 | 66.97 | 69.68 | 72.10 | 73.00 | 89.10 | 98.37 | 102.87 | 103.52 | d | 97.29 | b | 85.81 | 76.20 | 67.13 | 83.50 | |||||||||||
1976 | 69.23 | 70.17 | 73.13 | 79.10 | 89.61 | h | ----- | z | 101.35 | 102.52 | 90.48 | a | 84.19 | 75.97 | 68.54 | c | 81.47 | b | ||||||||
1977 | 64.65 | 76.14 | ----- | z | 84.60 | 82.65 | 101.57 | 104.00 | a | 100.90 | 96.63 | ----- | z | ----- | z | ----- | z | 88.89 | d | |||||||
1978 | 63.87 | a | 66.46 | 74.16 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 68.16 | i | ||
1979 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 101.65 | 102.00 | 104.77 | 90.68 | 72.80 | 68.97 | 90.14 | f | ||||||
1980 | 64.94 | 70.24 | 71.19 | 82.40 | 87.14 | b | 105.30 | 109.40 | a | 104.80 | a | 99.70 | 89.13 | 75.83 | a | 72.35 | 86.03 | |||||||||
1981 | 69.61 | 73.46 | 73.26 | 86.47 | 90.73 | a | 108.07 | 106.90 | 108.52 | 99.52 | a | 81.61 | 77.00 | a | 69.23 | 87.03 | ||||||||||
1982 | 64.66 | b | 70.64 | 71.50 | a | 81.83 | 88.77 | 96.03 | 101.84 | 100.61 | 94.33 | 84.07 | b | 69.47 | 61.52 | 82.11 | ||||||||||
1983 | 66.71 | 66.86 | 70.33 | a | 75.62 | a | 91.45 | 97.50 | 103.39 | 98.06 | 96.43 | 85.29 | 72.30 | 65.97 | 82.49 | |||||||||||
1984 | 68.45 | 72.25 | e | 78.17 | a | 80.27 | 98.03 | 97.33 | 99.55 | 99.10 | 97.30 | 81.10 | a | 72.87 | 61.29 | 83.81 | ||||||||||
1985 | 61.97 | 66.89 | 72.74 | 87.63 | 92.23 | 103.37 | 104.58 | 103.87 | 91.03 | 85.00 | c | 69.71 | b | 68.71 | 83.98 | |||||||||||
1986 | 74.10 | 72.07 | 80.13 | 83.66 | a | 92.81 | 102.77 | 100.45 | 102.48 | 90.93 | 83.29 | 73.97 | 66.07 | a | 85.23 | |||||||||||
1987 | 64.55 | 67.36 | 72.58 | 87.83 | 89.48 | 101.47 | 102.07 | a | 101.10 | 96.40 | 88.55 | 70.70 | 60.68 | 83.56 | ||||||||||||
1988 | 63.87 | 71.72 | 76.77 | 80.90 | 90.00 | ----- | z | 103.87 | 100.52 | 95.90 | 91.42 | 73.77 | 64.52 | 83.02 | a | |||||||||||
1989 | 62.90 | 69.79 | 80.87 | 90.23 | 91.97 | a | 100.70 | 105.55 | 100.55 | 98.33 | 86.97 | a | 76.80 | 68.77 | a | 86.12 | ||||||||||
1990 | 64.68 | 66.50 | 75.97 | 83.33 | 88.42 | 102.17 | 102.06 | 98.74 | 95.67 | 88.16 | 75.00 | 62.29 | 83.58 | |||||||||||||
1991 | 64.97 | 76.14 | 67.03 | 80.90 | 87.03 | 95.43 | 101.58 | 101.06 | 96.40 | 89.74 | 74.37 | 64.81 | 83.29 | |||||||||||||
1992 | 64.77 | 68.83 | 70.00 | 85.80 | 91.26 | 97.87 | 101.87 | 101.03 | 99.33 | 87.94 | 71.24 | a | 59.55 | 83.29 | ||||||||||||
1993 | 61.48 | 63.36 | 75.65 | 84.77 | 91.74 | 99.30 | 101.35 | 100.74 | 98.03 | 86.26 | 71.23 | 66.71 | 83.39 | |||||||||||||
1994 | 69.87 | 66.39 | 76.55 | 82.83 | 87.84 | 103.73 | 104.29 | 104.32 | 98.37 | 84.23 | 67.50 | 64.61 | 84.21 | |||||||||||||
1995 | 62.65 | 74.07 | 74.35 | 79.50 | 85.00 | 97.53 | 105.48 | 105.71 | 100.27 | 90.58 | 81.77 | 69.48 | 85.53 | |||||||||||||
1996 | 69.74 | 73.21 | 77.06 | 86.27 | 93.94 | 102.63 | 105.42 | 103.77 | 94.27 | 85.55 | 76.07 | 68.23 | 86.35 | |||||||||||||
1997 | 66.13 | 68.93 | 82.84 | 81.00 | 97.06 | 96.43 | 103.26 | 103.06 | 97.20 | 84.58 | 75.43 | 61.35 | 84.77 | |||||||||||||
1998 | 66.35 | 61.54 | 71.84 | 77.03 | 85.16 | 95.67 | 105.35 | 104.71 | 96.53 | 85.23 | 75.10 | 65.00 | 82.46 | |||||||||||||
1999 | 69.74 | 72.21 | 75.13 | 75.10 | 89.52 | 97.97 | 100.77 | 102.10 | 98.47 | 92.65 | 81.53 | 67.29 | 85.21 | |||||||||||||
2000 | 71.13 | 70.79 | 74.00 | 87.53 | 96.16 | 100.97 | 104.32 | 102.16 | 99.40 | 81.71 | 67.63 | 70.19 | 85.50 | |||||||||||||
2001 | 62.26 | 66.00 | 75.55 | 80.63 | 98.00 | 102.34 | a | 102.52 | 102.94 | 101.77 | 89.26 | 76.53 | 64.07 | a | 85.16 | |||||||||||
2002 | 65.81 | 73.29 | 74.39 | 84.77 | 90.97 | a | 103.10 | 105.03 | 104.19 | 98.33 | 84.00 | 76.47 | 64.61 | 85.41 | ||||||||||||
2003 | 74.61 | 66.86 | 74.58 | 78.13 | 92.13 | 100.30 | 105.55 | 102.42 | 100.67 | 93.87 | a | 70.13 | 66.19 | 85.45 | ||||||||||||
2004 | 66.39 | 64.90 | 83.97 | 82.70 | 93.10 | 100.03 | 103.74 | 102.39 | 96.50 | 82.13 | 66.87 | 63.13 | 83.82 | |||||||||||||
2005 | 64.13 | 64.32 | 71.74 | 81.90 | 92.84 | 99.13 | 107.19 | 100.55 | ----- | z | 85.87 | 77.37 | 69.52 | 83.14 | a | |||||||||||
2006 | 68.97 | 73.54 | 69.94 | 81.80 | 95.19 | 104.50 | 105.03 | 102.32 | 95.47 | 84.26 | 78.83 | 66.81 | 85.55 | |||||||||||||
2007 | 63.35 | 71.43 | 79.90 | 83.33 | 92.87 | 101.80 | 103.71 | 103.84 | 96.67 | 87.74 | 80.33 | 62.06 | 85.59 | |||||||||||||
2008 | 62.26 | 69.66 | 78.03 | 84.34 | a | 87.58 | 103.63 | 103.26 | 102.39 | 99.67 | 89.81 | 78.50 | 63.45 | 85.21 | ||||||||||||
2009 | 69.84 | 69.11 | 77.10 | 81.83 | 96.87 | 95.20 | 106.48 | 104.65 | 99.93 | 83.81 | 78.20 | 63.10 | 85.51 | |||||||||||||
2010 | 66.84 | 66.86 | 71.71 | 78.97 | 87.71 | 100.30 | 104.45 | 101.74 | 101.63 | 85.19 | 72.40 | 69.52 | 83.94 | |||||||||||||
2011 | 68.39 | 65.25 | 77.77 | 83.03 | 87.29 | 99.93 | 103.39 | 107.00 | 100.33 | 89.65 | 71.60 | 62.55 | 84.68 | |||||||||||||
2012 | 70.29 | 70.34 | 77.35 | 85.43 | 95.13 | 102.57 | 101.58 | 102.55 | 97.47 | 89.16 | 79.50 | 65.65 | 86.42 | |||||||||||||
2013 | 63.81 | 66.79 | 81.06 | 85.03 | 91.94 | 104.60 | 102.32 | 101.94 | 95.57 | 84.32 | 74.77 | 66.16 | 84.86 | |||||||||||||
2014 | 73.48 | 74.71 | 79.71 | 84.67 | 92.71 | 102.33 | 104.16 | 99.35 | 98.10 | 90.94 | 76.87 | 65.81 | 86.90 | |||||||||||||
2015 | 68.84 | 77.79 | 81.97 | 83.13 | 84.97 | 102.67 | 101.10 | 105.55 | 99.27 | 87.55 | 72.43 | 65.16 | 85.87 | |||||||||||||
2016 | 65.81 | 78.69 | 80.84 | 83.00 | 88.23 | 104.20 | 106.29 | 102.32 | 95.27 | 91.03 | 77.87 | 66.94 | 86.71 | |||||||||||||
2017 | 62.81 | 70.46 | 81.94 | 86.00 | 91.39 | 105.57 | 105.03 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 86.17 | e | |||||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 66.40 | 69.95 | 75.47 | 82.75 | 90.49 | 100.44 | 103.72 | 102.37 | 97.51 | 86.98 | 74.44 | 66.08 | 84.82 | |||||||||||||
S.D. | 3.49 | 4.01 | 4.32 | 3.67 | 3.65 | 3.29 | 1.99 | 2.13 | 2.83 | 3.67 | 3.62 | 3.17 | 1.25 | |||||||||||||
SKEW | 0.23 | 0.18 | 0.05 | -0.29 | 0.02 | -0.16 | 0.13 | 0.30 | -0.22 | -0.01 | -0.12 | 0.20 | -0.33 | |||||||||||||
MAX | 74.61 | 78.69 | 84.90 | 90.23 | 98.03 | 108.07 | 109.40 | 108.52 | 104.77 | 95.74 | 81.77 | 75.58 | 87.03 | |||||||||||||
MIN | 58.42 | 61.54 | 65.96 | 73.00 | 82.65 | 91.83 | 99.55 | 98.06 | 90.48 | 78.74 | 66.87 | 59.55 | 82.11 | |||||||||||||
YRS | 60 | 60 | 59 | 57 | 58 | 58 | 61 | 61 | 60 | 61 | 60 | 59 | 49 |