YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1971 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1972 | 61.23 | 73.34 | 85.87 | 85.57 | 95.74 | 103.73 | 113.70 | a | 108.20 | a | 98.70 | 81.71 | 68.07 | 59.97 | a | 86.32 | ||||||||||
1973 | 62.16 | 66.50 | 69.10 | 79.97 | 96.83 | a | 105.59 | a | 109.86 | b | 106.81 | 99.63 | 87.19 | 72.45 | a | 65.58 | 85.14 | |||||||||
1974 | 58.13 | 70.89 | a | 78.55 | 84.57 | 97.45 | 109.67 | 111.03 | a | 108.53 | a | 105.30 | 88.55 | 73.73 | 65.77 | 87.68 | ||||||||||
1975 | ----- | z | 68.75 | 74.32 | 77.13 | 94.71 | 104.63 | 111.32 | 108.87 | a | 103.17 | 87.97 | b | 73.23 | 67.42 | 88.32 | a | |||||||||
1976 | 66.81 | 69.41 | 74.94 | 82.67 | 97.45 | 103.90 | 110.63 | a | 104.71 | 96.15 | c | 86.32 | 78.60 | 63.19 | 86.23 | |||||||||||
1977 | 62.13 | a | 78.00 | 77.65 | 89.37 | 86.48 | 107.76 | a | ----- | z | 108.03 | 100.10 | ----- | z | 76.48 | a | 68.37 | a | 85.44 | b | ||||||
1978 | 60.90 | 68.50 | 75.32 | 78.73 | 94.87 | a | 106.30 | 111.65 | 109.07 | a | 92.37 | 93.07 | a | 73.30 | 59.64 | i | 87.64 | a | ||||||||
1979 | ----- | z | 68.11 | 70.13 | 81.69 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 65.68 | 71.40 | h | |||
1980 | 65.61 | 71.10 | 72.68 | 85.77 | 90.61 | c | 104.10 | 114.97 | 110.26 | 102.83 | 90.77 | 75.77 | 69.86 | b | 87.86 | |||||||||||
1981 | 66.78 | d | 69.33 | d | 75.14 | b | 92.13 | 95.44 | f | 110.40 | 112.74 | h | 110.57 | a | 102.04 | d | 84.85 | e | 78.04 | b | 66.52 | b | 85.58 | b | ||
1982 | 63.07 | a | 69.75 | h | 73.42 | 84.32 | b | 95.67 | a | 102.37 | 109.10 | 106.63 | a | 97.32 | b | 85.13 | a | 68.17 | 58.50 | a | 85.79 | a | ||||
1983 | 64.47 | a | 68.04 | 73.30 | a | 78.82 | b | 95.00 | h | 102.50 | j | ----- | z | 100.71 | c | 101.33 | 87.10 | 72.64 | b | 64.90 | a | 79.03 | c | |||
1984 | 66.61 | 70.30 | b | 77.97 | 84.57 | g | 101.27 | a | 102.13 | 106.77 | 105.39 | 102.63 | 80.94 | 69.79 | b | 55.87 | a | 85.42 | a | |||||||
1985 | 60.26 | 67.48 | a | 74.45 | i | 88.32 | h | 95.48 | d | 107.90 | 111.39 | 108.58 | 92.77 | 87.55 | 68.24 | a | 62.66 | b | 86.23 | b | ||||||
1986 | 69.26 | 72.63 | a | 81.27 | a | 84.86 | b | 97.07 | b | 107.33 | 105.90 | 108.82 | c | 93.00 | 83.93 | d | 73.50 | 59.97 | 86.46 | |||||||
1987 | 58.92 | e | 69.52 | c | 73.67 | a | 91.46 | d | 95.42 | e | 106.77 | 105.75 | c | 108.90 | 101.13 | 90.13 | 67.76 | a | 55.97 | b | 85.45 | |||||
1988 | 59.07 | c | 70.92 | d | 78.53 | a | 84.50 | b | 95.07 | b | 105.17 | a | 113.50 | a | 107.68 | 100.17 | a | 95.97 | a | 72.76 | a | 61.63 | a | 87.08 | ||
1989 | 59.58 | 67.41 | a | 81.11 | l | 94.52 | a | 97.67 | a | 107.69 | a | 115.68 | 108.93 | a | 102.17 | a | 87.29 | 76.63 | c | 64.54 | c | 89.28 | a | |||
1990 | 62.93 | b | 67.59 | a | 80.89 | c | 91.00 | c | 95.53 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 79.59 | g |
1991 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1992 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1993 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1994 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1995 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1996 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 98.93 | 85.29 | 72.80 | 63.63 | a | 80.16 | h | |||
1997 | 64.13 | a | 69.46 | 83.87 | 83.83 | 100.29 | 101.10 | 107.33 | a | 108.35 | 98.53 | 84.48 | 72.30 | 59.57 | a | 86.11 | ||||||||||
1998 | 63.26 | 63.32 | 73.35 | 78.97 | 84.47 | a | 97.13 | 110.13 | 109.87 | 96.97 | a | 83.48 | 71.30 | 62.83 | a | 82.92 | ||||||||||
1999 | 65.83 | a | 68.75 | 77.07 | a | 78.22 | c | 91.77 | 101.67 | 105.68 | 106.33 | a | 100.79 | a | 91.48 | 75.57 | 64.74 | 85.66 | ||||||||
2000 | 66.97 | 69.86 | 77.10 | b | 90.63 | 98.23 | 107.07 | 109.17 | b | 108.33 | a | 100.48 | a | 83.80 | a | 66.50 | b | 64.57 | c | 86.89 | ||||||
2001 | 58.97 | 61.96 | a | 78.58 | 81.03 | a | 100.90 | 106.32 | b | 107.52 | b | 109.84 | 103.43 | 89.84 | 74.50 | 60.38 | b | 86.11 | ||||||||
2002 | 62.53 | a | 72.41 | a | 74.64 | c | 86.75 | b | 93.52 | 106.45 | a | 111.67 | a | 108.45 | b | 100.17 | a | 85.16 | 73.28 | a | 62.00 | b | 86.42 | |||
2003 | 70.42 | 65.33 | a | 76.00 | 78.00 | d | 94.60 | a | 104.93 | 111.74 | 106.69 | b | 103.53 | 93.37 | a | 65.28 | a | 60.71 | c | 85.88 | ||||||
2004 | 62.23 | 63.39 | a | 83.17 | b | 84.28 | e | 94.70 | a | 104.60 | 108.55 | 106.57 | a | 99.80 | 83.30 | a | 67.62 | f | 61.21 | c | 86.53 | a | ||||
2005 | 60.83 | a | 65.04 | c | 73.87 | a | 80.79 | a | 93.76 | b | 100.52 | c | 110.89 | c | 106.73 | e | 97.50 | d | 89.43 | x | 75.45 | h | 65.38 | r | 87.77 | c |
2006 | 67.00 | f | 72.05 | h | 71.00 | t | 83.43 | p | 98.90 | u | 109.18 | b | 114.06 | 108.26 | d | 100.77 | 84.23 | 75.19 | n | 60.00 | p | 103.30 | g | |||
2007 | 62.75 | o | 69.90 | r | 81.71 | x | 90.00 | u | 96.65 | 105.70 | 111.50 | a | 108.52 | 98.30 | 84.97 | 76.80 | 57.63 | a | 92.51 | d | ||||||
2008 | 58.41 | b | 68.81 | b | 78.26 | 85.53 | 90.70 | a | 106.13 | 110.61 | 109.45 | 103.47 | 89.23 | 77.19 | c | 60.20 | a | 86.50 | ||||||||
2009 | 66.42 | 67.14 | 76.52 | 83.93 | b | 100.52 | 98.52 | a | 112.20 | a | 107.87 | h | 105.10 | 84.16 | 75.03 | 60.13 | 84.51 | a | ||||||||
2010 | 62.97 | 66.54 | 74.32 | 80.33 | 87.23 | 103.70 | 111.23 | 107.27 | a | 102.70 | 85.90 | 71.37 | 62.70 | a | 84.69 | |||||||||||
2011 | 62.10 | 66.57 | 74.71 | 83.83 | 87.16 | 101.50 | 106.71 | 109.35 | 101.77 | 89.35 | 68.57 | 60.52 | 84.35 | |||||||||||||
2012 | 66.32 | 70.22 | b | 77.26 | 86.69 | a | 98.39 | 105.41 | a | 106.87 | 108.03 | 102.50 | b | 88.52 | 75.50 | d | 62.77 | 87.37 | ||||||||
2013 | 60.23 | 67.86 | 80.90 | b | 87.36 | b | 94.77 | a | 106.60 | 109.55 | 105.48 | ----- | z | ----- | z | ----- | z | ----- | z | 89.09 | d | |||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 63.11 | 68.62 | 76.64 | 84.29 | 94.84 | 104.91 | 110.21 | 107.82 | 100.16 | 87.03 | 72.75 | 62.50 | 86.06 | |||||||||||||
S.D. | 3.25 | 3.12 | 3.79 | 4.54 | 4.18 | 3.05 | 2.73 | 1.91 | 3.26 | 3.50 | 3.54 | 3.38 | 1.20 | |||||||||||||
SKEW | 0.35 | 0.42 | 0.46 | 0.39 | -0.79 | -0.58 | -0.01 | -1.65 | -0.82 | 0.59 | -0.36 | 0.06 | -0.83 | |||||||||||||
MAX | 70.42 | 78.00 | 85.87 | 94.52 | 101.27 | 110.40 | 115.68 | 110.57 | 105.30 | 95.97 | 78.60 | 69.86 | 87.86 | |||||||||||||
MIN | 58.13 | 61.96 | 69.10 | 77.13 | 84.47 | 97.13 | 105.68 | 100.71 | 92.37 | 80.94 | 65.28 | 55.87 | 82.92 | |||||||||||||
YRS | 32 | 33 | 32 | 32 | 32 | 33 | 31 | 33 | 34 | 32 | 31 | 32 | 19 |