YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1975 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 105.90 | j | 105.55 | 100.59 | a | 87.71 | 75.50 | 66.81 | 87.23 | g | ||||
1976 | 67.55 | 70.79 | 73.48 | 80.53 | 94.16 | 102.93 | 105.65 | 105.48 | 94.20 | 85.19 | 77.17 | 66.94 | 85.34 | |||||||||||||
1977 | 62.23 | 74.30 | a | 71.68 | 86.36 | b | 84.66 | b | 104.87 | 107.03 | 105.10 | 99.67 | 91.10 | 77.80 | 71.29 | 86.34 | ||||||||||
1978 | 62.52 | 67.39 | 74.77 | 80.50 | 92.90 | 105.77 | 109.03 | 105.42 | 98.80 | 92.65 | 70.07 | 59.45 | 84.94 | |||||||||||||
1979 | 55.55 | 66.25 | 71.84 | 82.83 | 90.81 | 103.97 | 107.58 | 102.61 | 105.20 | 91.77 | 72.17 | 69.39 | 85.00 | |||||||||||||
1980 | 65.13 | 70.48 | 71.00 | 82.43 | 86.65 | 103.47 | 109.16 | 105.35 | 100.60 | 90.32 | 78.30 | 72.90 | 86.32 | |||||||||||||
1981 | 70.65 | 73.39 | 73.58 | 88.10 | 92.48 | 107.20 | 108.26 | 107.94 | 99.90 | 83.84 | 78.77 | 68.73 | a | 87.74 | ||||||||||||
1982 | 63.57 | a | 70.11 | 71.39 | 82.10 | 92.19 | 100.33 | 104.45 | 102.42 | 96.53 | 85.06 | 70.20 | 61.45 | 83.32 | ||||||||||||
1983 | 65.81 | 66.79 | 70.42 | 77.50 | 93.26 | 101.83 | 107.03 | 101.70 | a | 99.67 | 84.81 | 73.40 | 66.52 | 84.06 | ||||||||||||
1984 | 67.10 | 71.38 | 79.68 | 83.23 | 100.32 | 101.33 | 105.45 | i | 103.57 | a | 101.20 | 83.94 | 73.43 | 60.39 | 84.14 | a | ||||||||||
1985 | 61.74 | 64.21 | 73.32 | 88.37 | 95.90 | 106.43 | 108.61 | 107.84 | 93.50 | 85.48 | 70.50 | 64.93 | a | 85.07 | ||||||||||||
1986 | 70.74 | 69.36 | 80.35 | 84.40 | 95.13 | 106.37 | 104.13 | 106.13 | 93.47 | 85.23 | 74.97 | 63.81 | 86.17 | |||||||||||||
1987 | 62.32 | 70.18 | 73.03 | 89.90 | 93.55 | 106.00 | 106.10 | 104.87 | 100.63 | 91.26 | 71.63 | 60.71 | 85.85 | |||||||||||||
1988 | 62.68 | 72.66 | 79.94 | 83.10 | 93.90 | 105.00 | 109.77 | 103.77 | 99.37 | 95.19 | 75.30 | 66.00 | 87.22 | |||||||||||||
1989 | 63.68 | 70.43 | 83.03 | 94.57 | 95.77 | 105.07 | 110.16 | 105.84 | 102.10 | 89.58 | 78.57 | 68.03 | 88.90 | |||||||||||||
1990 | 64.03 | 65.00 | 78.67 | a | 86.20 | 92.42 | 106.63 | 101.10 | 103.23 | 100.00 | 91.16 | 77.10 | 61.77 | 85.61 | ||||||||||||
1991 | 63.39 | 78.50 | 69.16 | 82.70 | 90.71 | 99.37 | 108.42 | 105.97 | 100.14 | a | 94.13 | 74.90 | 65.10 | 86.04 | ||||||||||||
1992 | 64.32 | 70.97 | 73.81 | 88.27 | 96.48 | 103.59 | a | 106.84 | 106.10 | 102.17 | 91.26 | 72.87 | 60.61 | 86.44 | ||||||||||||
1993 | 63.10 | 66.33 | a | 76.84 | 87.63 | 96.61 | 104.03 | 107.10 | 106.16 | 102.33 | 90.61 | 72.30 | 67.55 | 86.72 | ||||||||||||
1994 | 70.10 | 68.43 | 79.71 | 87.37 | 93.61 | 108.93 | 110.29 | 109.35 | 102.47 | 88.06 | 70.37 | 64.90 | 87.80 | |||||||||||||
1995 | 63.19 | 75.82 | 75.48 | 82.47 | 89.00 | 101.80 | 110.84 | 109.65 | 105.07 | 93.16 | 83.30 | 70.35 | 88.34 | |||||||||||||
1996 | 70.03 | 74.72 | 79.90 | 89.47 | 97.32 | 107.77 | 109.84 | 109.35 | 99.47 | 90.45 | 77.67 | 68.55 | 89.55 | |||||||||||||
1997 | 66.73 | a | 71.64 | 84.77 | 83.50 | 100.90 | 102.60 | 108.58 | 107.45 | 101.20 | 88.03 | 77.57 | 63.03 | 88.00 | ||||||||||||
1998 | 66.94 | 63.71 | 74.68 | 79.00 | 89.90 | 99.57 | 110.84 | 109.06 | 100.83 | 88.42 | 76.90 | 66.45 | 85.53 | |||||||||||||
1999 | 70.68 | 73.36 | 79.55 | 78.70 | 92.87 | 102.50 | 104.55 | 107.55 | 102.23 | 96.58 | 82.83 | 69.84 | 88.44 | |||||||||||||
2000 | 71.74 | 73.07 | 76.71 | 92.10 | 101.03 | 107.10 | 109.71 | 106.03 | 103.10 | 87.39 | 68.23 | 69.81 | 88.84 | |||||||||||||
2001 | 63.84 | 67.54 | 78.19 | 86.13 | 102.58 | 106.67 | 107.71 | 108.42 | 104.97 | 92.42 | 78.72 | a | 63.71 | 88.41 | ||||||||||||
2002 | 66.94 | 73.43 | 77.68 | 89.27 | 95.90 | 107.67 | 110.48 | 108.68 | 103.50 | 88.13 | 78.83 | 65.90 | 88.87 | |||||||||||||
2003 | 72.32 | 69.96 | 75.90 | 82.20 | 95.68 | 105.20 | 110.42 | 105.77 | 103.90 | 97.58 | 70.64 | b | 67.19 | 88.06 | ||||||||||||
2004 | 67.00 | 66.66 | 86.58 | 86.17 | 97.26 | 105.97 | 108.58 | 106.74 | 100.97 | 85.70 | a | 68.27 | 64.37 | a | 87.02 | |||||||||||
2005 | 63.61 | 67.07 | 74.10 | 83.80 | 96.19 | 103.20 | 111.74 | 104.10 | 101.80 | 87.84 | 76.90 | 66.68 | 86.42 | |||||||||||||
2006 | 68.94 | 74.96 | 72.61 | 84.80 | 99.90 | 108.83 | 110.57 | a | 106.55 | 99.50 | 88.32 | 80.43 | 65.48 | b | 88.41 | |||||||||||
2007 | 64.35 | 72.64 | 81.94 | 86.50 | 98.13 | 106.40 | 109.42 | 107.84 | 100.12 | e | 88.74 | 81.77 | 61.87 | a | 88.31 | |||||||||||
2008 | 62.35 | 67.48 | 79.83 | a | 87.23 | 91.23 | 107.53 | 108.86 | b | 108.88 | f | 102.50 | b | 92.53 | a | 79.63 | 62.71 | 85.63 | a | |||||||
2009 | 68.61 | 67.60 | h | 79.13 | 84.23 | 101.26 | 96.80 | o | 111.52 | 109.19 | 104.47 | 88.96 | c | 80.25 | b | 61.77 | 88.94 | b | ||||||||
2010 | 66.79 | b | 67.93 | 72.68 | 82.10 | 89.45 | 104.90 | 110.21 | c | 105.93 | b | 105.43 | b | 88.69 | b | 73.23 | d | 67.34 | b | 86.22 | ||||||
2011 | 65.21 | c | 66.60 | c | 78.67 | a | 85.66 | a | 90.80 | a | 104.70 | c | 107.55 | 110.97 | b | 104.00 | c | 91.62 | b | 74.21 | b | 61.31 | b | 86.77 | ||
2012 | 70.07 | a | 72.64 | a | 78.42 | g | 87.85 | d | 98.64 | c | 107.90 | a | 105.77 | a | 107.55 | 102.83 | a | 92.93 | c | 81.22 | c | 65.66 | b | 90.28 | a | |
2013 | 62.32 | 67.11 | 81.71 | g | 87.90 | 97.19 | 109.21 | a | 107.68 | 105.90 | a | 99.13 | 87.32 | 75.68 | b | 65.71 | c | 87.74 | a | |||||||
2014 | 71.96 | c | 76.96 | e | 81.72 | b | 88.43 | b | 95.87 | 106.80 | 108.29 | 103.74 | 101.80 | 92.37 | a | 78.68 | b | 65.60 | a | 89.35 | ||||||
2015 | 67.59 | b | 78.89 | 84.71 | c | 87.14 | a | 89.70 | d | 107.63 | 105.63 | a | 109.53 | a | 103.27 | d | 90.77 | a | 73.46 | b | 62.28 | f | 90.76 | a | ||
2016 | 64.44 | d | 79.35 | c | 84.86 | j | 86.93 | a | 93.26 | 110.07 | b | 110.50 | a | 106.97 | 99.78 | c | 94.30 | a | 80.14 | b | 64.83 | a | 90.05 | a | ||
2017 | 61.33 | a | 70.93 | a | 81.31 | b | 87.82 | b | 94.78 | d | 109.32 | b | 109.47 | a | 108.70 | a | 99.59 | c | 93.50 | a | 80.86 | a | 70.29 | 88.99 | ||
2018 | 70.67 | a | 71.36 | f | 77.81 | d | 90.58 | f | 96.58 | 106.67 | 108.00 | a | 107.16 | 105.79 | a | 85.87 | a | 76.17 | a | 65.07 | a | 89.98 | b | |||
2019 | 63.83 | a | 62.61 | 75.77 | a | 88.18 | b | 87.07 | a | 104.50 | 109.58 | 109.70 | a | 99.47 | 88.27 | a | 76.80 | 62.14 | c | 85.66 | ||||||
2020 | 66.30 | a | 70.64 | a | 72.80 | a | 85.86 | a | 99.61 | 105.28 | a | 111.52 | 112.76 | b | 106.07 | a | 95.84 | 78.80 | 67.53 | a | 89.42 | |||||
2021 | 66.32 | 72.04 | 75.86 | b | 89.70 | c | 96.70 | a | 108.97 | a | 106.77 | a | 106.06 | 102.04 | d | 87.15 | e | 83.40 | 66.89 | l | 90.46 | a | ||||
2022 | 67.55 | 71.19 | b | 80.58 | g | 88.97 | 97.34 | b | 107.50 | b | 108.03 | 104.18 | c | 102.00 | b | 87.71 | 70.21 | a | 64.24 | b | 88.08 | a | ||||
2023 | 62.48 | 66.39 | 69.33 | a | 86.73 | 94.79 | b | 101.17 | a | 113.38 | b | 108.06 | 100.90 | 93.19 | d | 79.42 | f | 69.10 | a | 87.78 | a | |||||
2024 | 63.48 | 70.28 | d | 74.74 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 69.50 | i | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 65.79 | 70.48 | 76.63 | 85.64 | 94.64 | 105.33 | 108.44 | 106.62 | 101.19 | 89.84 | 76.04 | 65.61 | 87.01 | |||||||||||||
S.D. | 3.48 | 3.97 | 4.30 | 3.52 | 4.03 | 2.69 | 2.32 | 2.33 | 2.84 | 3.43 | 4.06 | 3.19 | 1.61 | |||||||||||||
SKEW | -0.06 | 0.28 | 0.29 | -0.15 | -0.25 | -0.41 | -0.68 | 0.13 | -0.77 | 0.20 | -0.14 | 0.06 | -0.22 | |||||||||||||
MAX | 72.32 | 79.35 | 86.58 | 94.57 | 102.58 | 110.07 | 113.38 | 112.76 | 106.07 | 97.58 | 83.40 | 72.90 | 89.55 | |||||||||||||
MIN | 55.55 | 62.61 | 69.16 | 77.50 | 84.66 | 99.37 | 101.10 | 101.70 | 93.47 | 83.84 | 68.23 | 59.45 | 83.32 | |||||||||||||
YRS | 49 | 47 | 45 | 47 | 48 | 47 | 47 | 48 | 49 | 49 | 48 | 47 | 37 |