YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1979 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 91.32 | c | 72.47 | 70.42 | 78.07 | i | ||
1980 | 65.84 | 70.83 | 70.74 | 83.33 | 87.77 | 103.50 | 107.16 | 103.06 | 100.07 | ----- | z | 78.97 | 75.19 | 86.04 | a | |||||||||||
1981 | 70.71 | 74.64 | 74.87 | 90.53 | 94.45 | 107.37 | 107.52 | 105.13 | h | 94.78 | g | 87.00 | 80.50 | 70.65 | 85.82 | b | ||||||||||
1982 | 63.94 | 70.36 | 72.52 | 85.93 | 93.65 | 102.87 | 106.16 | 106.90 | 100.70 | 88.06 | 71.66 | a | 63.19 | 85.49 | ||||||||||||
1983 | 66.74 | 67.46 | 71.58 | 78.87 | 94.39 | 103.23 | 108.65 | 105.10 | 102.37 | 87.16 | 73.67 | 64.32 | 85.29 | |||||||||||||
1984 | 66.97 | 71.69 | 80.77 | 82.83 | 100.90 | 104.80 | 105.13 | 104.00 | a | 100.59 | a | 82.87 | 73.23 | 61.52 | 86.28 | |||||||||||
1985 | 63.35 | 67.57 | 74.06 | 87.57 | 96.32 | 107.43 | 108.06 | 106.94 | 95.53 | 86.42 | 71.23 | 66.13 | 85.89 | |||||||||||||
1986 | 72.65 | 70.93 | 80.58 | 86.70 | 96.61 | 106.00 | 103.52 | 106.58 | 96.10 | 85.45 | 74.80 | 64.23 | 87.01 | |||||||||||||
1987 | 64.77 | 67.75 | 73.53 | a | 90.13 | 94.60 | a | 106.43 | 104.06 | 103.87 | 99.40 | 93.23 | 71.17 | 61.48 | 85.87 | |||||||||||
1988 | 64.45 | 74.59 | 80.13 | 83.50 | 94.97 | 106.37 | 107.35 | 104.45 | 100.23 | 94.32 | 76.57 | 66.42 | 87.78 | |||||||||||||
1989 | 65.43 | c | 73.00 | a | 83.45 | 94.57 | 97.28 | b | 104.97 | 109.26 | 105.71 | 103.83 | 90.58 | 80.80 | 69.71 | 89.88 | ||||||||||
1990 | 67.10 | 67.21 | 79.23 | 88.03 | 93.94 | 108.07 | 105.29 | 102.97 | 100.13 | 92.42 | 78.67 | 63.94 | 87.25 | |||||||||||||
1991 | 65.90 | 78.68 | 69.00 | 84.30 | 93.29 | 100.87 | 106.58 | 106.90 | 100.07 | 93.94 | 74.53 | 64.84 | 86.57 | |||||||||||||
1992 | 65.00 | 71.79 | 75.55 | 90.03 | 95.68 | 103.87 | 105.45 | 104.97 | a | 104.10 | 94.35 | 74.03 | 63.03 | 87.32 | ||||||||||||
1993 | 66.03 | 67.43 | 78.35 | 88.47 | 98.77 | 105.23 | 106.90 | 105.35 | 103.31 | a | 90.13 | 73.57 | 67.94 | 87.62 | ||||||||||||
1994 | 71.10 | 69.96 | 79.71 | 88.07 | 94.90 | 109.37 | 109.06 | 109.29 | 103.20 | 88.23 | 71.13 | 66.90 | 88.41 | |||||||||||||
1995 | 63.87 | 76.96 | 78.61 | 83.33 | 90.65 | 104.30 | 111.06 | 110.39 | 105.37 | 95.39 | 81.70 | 72.26 | 89.49 | |||||||||||||
1996 | 71.29 | 75.41 | 79.81 | 90.37 | 100.00 | 109.13 | 108.71 | 109.61 | 98.27 | 91.57 | a | 79.10 | 70.03 | 90.27 | ||||||||||||
1997 | 65.16 | 72.96 | 86.23 | 84.47 | 96.48 | 98.73 | 103.45 | 102.07 | a | 98.70 | 85.00 | 74.80 | 60.55 | 85.72 | ||||||||||||
1998 | 66.06 | 60.86 | 70.48 | 76.03 | 87.14 | b | 96.23 | 104.77 | 104.26 | 97.57 | 85.61 | 74.17 | 65.94 | 82.43 | ||||||||||||
1999 | 68.79 | g | 71.54 | 77.19 | 76.93 | 90.42 | 98.47 | 101.07 | a | 104.03 | 98.37 | 92.43 | a | 81.90 | 67.43 | a | 87.25 | a | ||||||||
2000 | 69.66 | b | 72.86 | 74.35 | 88.00 | 97.90 | 104.63 | 107.13 | 103.35 | 102.26 | c | 85.80 | p | 64.06 | l | 67.31 | e | 88.75 | b | |||||||
2001 | 62.68 | c | 66.61 | 74.84 | 82.39 | b | 98.52 | 104.17 | 103.58 | 104.10 | 102.61 | b | 91.26 | 77.83 | 62.54 | c | 85.93 | |||||||||
2002 | 66.45 | 72.04 | 78.69 | b | 87.95 | h | 93.16 | 105.30 | 105.03 | 103.52 | 99.10 | 84.97 | 74.93 | 61.94 | 85.92 | a | ||||||||||
2003 | 70.87 | 67.29 | 72.58 | 80.83 | 94.65 | 103.03 | 106.94 | 104.42 | 99.77 | 94.06 | 72.73 | 67.06 | 86.19 | |||||||||||||
2004 | 66.61 | 65.34 | 81.87 | 84.07 | 95.87 | 102.43 | 104.84 | 102.74 | 98.10 | 85.35 | 68.97 | 64.52 | 85.06 | |||||||||||||
2005 | 64.74 | 65.75 | 72.48 | 83.40 | 93.32 | 100.80 | 107.52 | 101.39 | 100.67 | 89.29 | 78.90 | 68.45 | 85.56 | |||||||||||||
2006 | 70.03 | a | 73.58 | b | 72.71 | 82.77 | d | 97.41 | d | 106.00 | g | 106.32 | i | 102.71 | 94.90 | 85.40 | a | 78.56 | l | 64.81 | o | 84.94 | d | |||
2007 | 62.41 | b | 69.79 | 79.81 | 83.53 | 94.61 | 102.87 | 104.06 | 103.90 | a | 98.50 | 88.80 | a | 79.68 | k | 61.23 | a | 86.32 | a | |||||||
2008 | 61.65 | 66.38 | 75.71 | j | 84.50 | 88.97 | b | 103.37 | 102.29 | 101.52 | 98.43 | 89.26 | h | 78.12 | m | 62.63 | d | 85.53 | c | |||||||
2009 | 67.71 | c | 68.78 | a | 76.66 | b | 81.30 | c | 95.68 | c | 97.37 | 107.03 | 104.48 | 99.37 | 84.32 | 78.73 | 61.03 | a | 85.21 | |||||||
2010 | 64.23 | e | 66.50 | 70.36 | c | 80.60 | 88.13 | 101.62 | a | 104.97 | 102.16 | 101.43 | 86.74 | 72.93 | a | 69.86 | b | 84.13 | ||||||||
2011 | 65.81 | d | 64.50 | 77.14 | b | 84.03 | 88.53 | a | 100.46 | d | 103.08 | e | 106.03 | 100.55 | a | 88.71 | c | 71.62 | a | 60.26 | d | 84.23 | ||||
2012 | 68.28 | b | 69.90 | 75.97 | 85.60 | 95.23 | 104.53 | 102.53 | a | 104.26 | 95.85 | d | 89.37 | a | 79.87 | 65.27 | a | 86.39 | ||||||||
2013 | 61.21 | c | 65.04 | 77.46 | c | 84.45 | a | 92.84 | 104.40 | 103.18 | c | 102.52 | b | 96.00 | h | 85.39 | c | 74.61 | b | 64.69 | e | 83.25 | a | |||
2014 | 70.21 | g | 73.18 | 77.77 | 84.63 | c | 91.83 | a | 100.96 | c | 102.34 | b | 97.07 | b | 93.17 | a | 87.65 | 75.77 | 64.97 | 86.30 | a | |||||
2015 | 65.53 | a | 74.18 | 80.67 | d | 83.22 | c | 86.31 | b | 102.54 | d | 101.97 | b | 104.50 | c | 97.26 | c | 87.73 | i | 71.37 | c | 63.73 | i | 86.75 | b | |
2016 | 62.22 | m | 79.47 | n | 81.41 | n | 85.32 | k | 90.83 | s | 105.55 | j | 106.94 | n | 101.00 | m | 95.00 | o | 91.53 | p | 76.07 | p | 66.67 | m | ----- | z |
2017 | 62.06 | m | 71.12 | l | 78.67 | m | 85.71 | m | 90.61 | 103.13 | g | 102.79 | b | 101.40 | f | 95.87 | g | 91.21 | b | 81.52 | a | 69.37 | d | 87.10 | g | |
2018 | 70.48 | f | 69.27 | b | 74.70 | d | 87.63 | c | 93.24 | j | 103.05 | i | 103.31 | b | 100.74 | d | 100.45 | a | 79.92 | e | 73.46 | f | 64.03 | a | 85.01 | d |
2019 | 63.70 | a | 59.21 | d | 73.10 | 84.07 | a | 84.27 | a | 99.96 | b | 104.48 | d | 103.08 | r | 95.74 | c | 85.34 | b | 73.68 | e | 61.30 | a | 80.44 | a | |
2020 | 65.43 | c | 66.58 | c | 71.00 | a | 83.24 | a | 96.07 | a | 101.83 | a | 105.84 | 107.50 | a | 100.85 | c | 92.67 | a | 79.07 | b | 66.46 | c | 86.38 | ||
2021 | 65.87 | a | 69.38 | b | 72.50 | a | 84.14 | b | 92.57 | c | 104.46 | d | 100.52 | 99.75 | c | 97.21 | b | 84.30 | a | 80.52 | g | 68.41 | b | 85.37 | a | |
2022 | 65.93 | c | 68.15 | a | 75.67 | a | 85.96 | c | 92.91 | i | 102.73 | 103.77 | 99.45 | b | 98.57 | b | 84.97 | b | 69.77 | 63.00 | b | 83.45 | a | |||
2023 | 60.07 | a | 64.75 | 67.77 | 84.18 | b | 92.17 | a | 97.77 | 108.81 | 104.58 | 99.00 | 91.16 | f | 77.50 | 68.31 | b | 84.08 | a | |||||||
2024 | 61.97 | b | 68.41 | b | 71.36 | c | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 67.24 | i |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 65.93 | 69.51 | 75.85 | 84.79 | 93.68 | 103.31 | 105.36 | 104.18 | 99.54 | 88.60 | 75.49 | 65.68 | 86.45 | |||||||||||||
S.D. | 2.93 | 4.04 | 4.18 | 3.65 | 3.79 | 3.11 | 2.47 | 2.69 | 2.68 | 3.75 | 3.65 | 3.50 | 1.78 | |||||||||||||
SKEW | 0.40 | -0.11 | 0.23 | 0.10 | -0.50 | -0.25 | 0.15 | -0.01 | -0.07 | 0.01 | 0.20 | 0.48 | 0.30 | |||||||||||||
MAX | 72.65 | 78.68 | 86.23 | 94.57 | 100.90 | 109.37 | 111.06 | 110.39 | 105.37 | 95.39 | 81.90 | 75.19 | 90.27 | |||||||||||||
MIN | 60.07 | 59.21 | 67.77 | 76.03 | 84.27 | 96.23 | 100.52 | 97.07 | 93.17 | 79.92 | 68.97 | 60.26 | 82.43 | |||||||||||||
YRS | 40 | 43 | 42 | 41 | 41 | 40 | 42 | 40 | 40 | 39 | 38 | 42 | 26 |