YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1980 | ----- | z | ----- | z | ----- | z | ----- | z | 80.42 | 91.50 | ----- | z | 98.23 | 93.17 | 83.55 | 71.57 | 67.23 | 83.66 | e | |||||||
1981 | 62.58 | 66.61 | 67.45 | 80.67 | 86.19 | 99.83 | 102.26 | 102.35 | 94.23 | 75.97 | 71.03 | a | 63.81 | 81.08 | ||||||||||||
1982 | 56.52 | 65.73 | b | 65.87 | a | 74.17 | 86.33 | a | 91.55 | a | 97.77 | 98.77 | 89.34 | a | 78.03 | a | 63.04 | b | 56.13 | 76.94 | ||||||
1983 | 60.87 | 63.52 | a | 66.39 | c | 69.04 | b | 84.90 | 92.69 | a | 97.58 | 96.10 | 95.38 | a | 81.13 | 68.28 | a | 60.70 | a | 78.05 | ||||||
1984 | 63.68 | 67.26 | b | 73.68 | 76.17 | 93.00 | 93.47 | 100.10 | a | 99.29 | 95.13 | 76.10 | b | 65.23 | 52.50 | a | 79.63 | |||||||||
1985 | 58.39 | 65.07 | a | 68.60 | a | 83.10 | a | ----- | z | 99.63 | 102.26 | 99.48 | 88.14 | b | 81.90 | a | 65.03 | 61.70 | a | 79.39 | a | |||||
1986 | 68.47 | a | 67.04 | 75.14 | b | 78.68 | b | 88.34 | b | 98.53 | 98.17 | a | 102.20 | a | 85.04 | b | 80.03 | a | 70.24 | a | 59.26 | 80.93 | ||||
1987 | 57.68 | 64.21 | 68.19 | 85.83 | a | 85.86 | b | 97.77 | 97.71 | 100.45 | 94.43 | b | 84.30 | a | 65.37 | 55.29 | 79.76 | |||||||||
1988 | 58.48 | 69.34 | 74.77 | a | 77.14 | a | 86.07 | a | 95.55 | a | 103.41 | b | 99.48 | 93.55 | a | 90.93 | c | 70.41 | c | 59.57 | a | 81.56 | ||||
1989 | 59.10 | a | 62.36 | 75.82 | c | 86.17 | f | 86.77 | 96.45 | a | 104.10 | 98.10 | b | 93.27 | 81.48 | b | 73.79 | a | 64.36 | i | 83.12 | b | ||||
1990 | ----- | z | 63.41 | a | 76.37 | a | 81.83 | a | 85.57 | a | 98.21 | a | 103.79 | b | 99.13 | a | 95.54 | b | 85.37 | d | 70.70 | 56.73 | a | 83.33 | a | |
1991 | 59.41 | b | 74.30 | a | 64.63 | a | 75.26 | c | 78.34 | b | 89.76 | m | 101.93 | a | 100.03 | b | 96.41 | a | 87.96 | c | 72.64 | b | 59.36 | c | 79.12 | a |
1992 | ----- | z | 69.06 | m | 67.85 | d | 82.41 | c | 90.77 | 93.61 | b | 98.77 | a | 101.61 | c | 95.11 | b | 84.00 | d | 68.64 | b | 58.04 | d | 84.08 | b | |
1993 | 56.88 | f | 62.79 | d | 74.14 | c | 80.50 | d | 87.04 | e | 94.00 | c | 98.52 | d | 99.68 | i | 96.16 | e | 82.68 | c | 67.46 | d | 62.92 | f | 82.59 | c |
1994 | 66.62 | g | 63.71 | g | ----- | z | 82.14 | h | 85.59 | d | 100.44 | c | 105.16 | f | 103.33 | d | 95.62 | a | 81.58 | 63.31 | a | 63.33 | a | 84.75 | e | |
1995 | 64.00 | b | 75.26 | e | 70.48 | 73.96 | d | 84.06 | 98.10 | a | 101.77 | 102.60 | a | 98.13 | 88.46 | c | 79.23 | 65.42 | 83.46 | |||||||
1996 | 66.62 | b | 68.03 | 73.26 | d | 81.70 | 88.52 | f | 98.23 | 105.50 | a | 104.21 | b | 94.74 | c | 82.45 | b | 71.38 | a | 62.37 | a | 82.59 | a | |||
1997 | 62.03 | a | 66.81 | a | 80.03 | a | 77.79 | a | 93.48 | 95.45 | a | 101.00 | c | 101.38 | b | 94.66 | a | 82.07 | a | 70.00 | b | 58.03 | a | 81.90 | ||
1998 | 61.63 | a | 57.72 | c | 67.87 | 72.35 | j | 78.08 | e | 91.85 | q | 103.08 | f | 103.83 | g | 90.68 | e | 79.61 | 68.03 | a | 57.61 | 70.16 | d | |||
1999 | 63.33 | g | 63.42 | d | 71.70 | a | 72.21 | a | 84.79 | b | 94.86 | a | 102.37 | a | 102.87 | 96.07 | 88.82 | c | 72.00 | 63.06 | 82.92 | a | ||||
2000 | ----- | z | 64.52 | 71.44 | d | 84.40 | 94.19 | 99.89 | b | 101.61 | 101.45 | b | 96.21 | a | 83.74 | 66.76 | i | ----- | z | 88.61 | c | |||||
2001 | 56.57 | c | 57.65 | b | 73.13 | 82.56 | l | ----- | z | ----- | z | ----- | z | 103.74 | 97.23 | 85.90 | b | 68.93 | 56.06 | 74.90 | d | |||||
2002 | 59.35 | 68.22 | a | 69.29 | c | 80.97 | a | 87.68 | 98.97 | 104.74 | 101.47 | a | 93.63 | 78.73 | a | 68.47 | 56.87 | 80.70 | ||||||||
2003 | 65.94 | 60.07 | 69.87 | a | 69.80 | 86.87 | a | 97.80 | 104.34 | b | 100.84 | 96.83 | 87.67 | a | 60.97 | 56.71 | 79.81 | |||||||||
2004 | 58.16 | 58.17 | 77.00 | 78.72 | a | 88.19 | 97.59 | a | 102.55 | 99.73 | e | 90.78 | g | 76.29 | 61.93 | a | 57.45 | 77.80 | a | |||||||
2005 | 57.53 | a | 59.41 | a | 67.23 | 74.74 | c | 88.13 | 93.66 | a | 104.03 | 99.93 | a | 89.83 | 78.50 | a | 69.48 | a | 60.50 | a | 78.58 | |||||
2006 | 59.84 | 65.78 | a | 62.68 | 74.64 | b | 90.52 | 99.86 | a | 104.63 | a | 100.10 | 92.47 | 77.67 | a | 70.07 | a | 58.45 | 79.72 | |||||||
2007 | 57.40 | a | 64.25 | 76.84 | 80.17 | 89.32 | 99.03 | 104.57 | a | 102.33 | a | 90.33 | 78.77 | a | 71.23 | 54.19 | 80.70 | |||||||||
2008 | 54.23 | 64.73 | c | 71.46 | c | 78.19 | c | 83.86 | c | 98.43 | 103.67 | a | 102.53 | a | 95.30 | 81.81 | 70.13 | 53.90 | 79.85 | |||||||
2009 | 62.23 | 60.46 | 69.74 | 76.67 | 92.61 | 90.33 | 104.87 | 99.77 | 96.80 | 77.97 | 68.87 | 55.35 | 79.64 | |||||||||||||
2010 | 57.87 | 60.75 | 67.35 | 72.77 | 79.31 | b | 96.00 | 103.81 | 99.97 | 94.53 | 78.94 | 64.90 | 58.81 | 77.92 | ||||||||||||
2011 | 58.61 | 58.89 | 67.90 | 76.93 | 79.06 | 92.70 | 99.90 | 101.58 | 94.17 | 82.48 | 62.47 | 56.61 | 77.61 | |||||||||||||
2012 | 63.13 | 63.79 | 69.87 | 78.17 | 89.03 | 97.57 | 100.39 | 102.03 | 95.47 | 82.32 | 70.20 | 58.13 | 80.84 | |||||||||||||
2013 | 54.52 | 61.96 | 74.45 | 79.87 | 85.90 | 99.27 | 102.97 | 99.16 | 92.30 | 77.65 | 65.83 | 57.77 | 79.30 | |||||||||||||
2014 | 65.23 | 68.32 | 71.77 | 79.00 | 86.61 | 97.83 | 102.90 | 98.00 | 94.70 | 84.90 | 70.10 | 57.52 | 81.41 | |||||||||||||
2015 | 60.32 | 70.93 | 75.87 | 77.66 | a | 82.60 | a | 99.47 | 96.77 | 103.13 | 94.73 | 81.90 | 64.37 | 56.29 | 80.34 | |||||||||||
2016 | 56.81 | 68.69 | 72.90 | 77.53 | 83.16 | 101.10 | 104.55 | 101.68 | 91.27 | 80.77 | 69.63 | 58.00 | 80.51 | |||||||||||||
2017 | 54.07 | a | 63.61 | 73.77 | 77.50 | 86.71 | 99.73 | 105.19 | 101.26 | 90.00 | 82.81 | 71.90 | 62.55 | 80.76 | ||||||||||||
2018 | 63.90 | 64.50 | 66.90 | 82.00 | 86.29 | 98.63 | 105.10 | 102.74 | 96.92 | e | 79.03 | b | 69.03 | a | 57.65 | 81.06 | ||||||||||
2019 | 57.55 | 55.00 | 68.06 | 80.30 | 77.19 | 96.47 | 101.68 | 102.97 | 93.00 | 78.62 | b | 69.47 | 53.23 | a | 77.79 | |||||||||||
2020 | 60.19 | 66.97 | 64.58 | 74.40 | 89.26 | 96.17 | 103.10 | 105.03 | 97.27 | 88.52 | 69.00 | 60.52 | 81.25 | |||||||||||||
2021 | 59.94 | 65.14 | 65.26 | h | 79.68 | h | 88.37 | a | 101.83 | 105.13 | 102.97 | 96.17 | 77.63 | a | 74.25 | b | 59.19 | 83.06 | b | |||||||
2022 | 59.94 | 63.26 | a | 72.13 | 78.86 | a | 87.16 | 97.93 | c | 102.97 | 101.94 | 95.77 | 83.71 | 62.28 | a | 56.71 | 80.22 | |||||||||
2023 | 54.35 | 56.93 | a | 60.07 | c | 76.87 | 85.23 | 89.93 | 106.19 | 98.70 | a | 91.10 | 80.84 | 66.80 | 60.35 | 77.28 | ||||||||||
2024 | 58.23 | 59.24 | 64.42 | 71.00 | l | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 60.63 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 59.88 | 64.15 | 70.50 | 77.91 | 86.17 | 96.83 | 102.32 | 101.02 | 93.97 | 81.90 | 68.55 | 58.61 | 79.95 | |||||||||||||
S.D. | 3.52 | 4.42 | 4.36 | 3.75 | 4.10 | 3.04 | 2.55 | 1.93 | 2.78 | 3.74 | 3.73 | 3.23 | 1.53 | |||||||||||||
SKEW | 0.44 | 0.24 | -0.10 | -0.27 | -0.33 | -0.65 | -0.66 | -0.23 | -1.11 | 0.49 | 0.02 | 0.55 | -0.22 | |||||||||||||
MAX | 68.47 | 75.26 | 80.03 | 85.83 | 94.19 | 101.83 | 106.19 | 105.03 | 98.13 | 90.93 | 79.23 | 67.23 | 83.46 | |||||||||||||
MIN | 54.07 | 55.00 | 60.07 | 69.04 | 77.19 | 89.93 | 96.77 | 96.10 | 85.04 | 75.97 | 60.97 | 52.50 | 76.94 | |||||||||||||
YRS | 38 | 42 | 42 | 38 | 41 | 41 | 40 | 42 | 43 | 44 | 43 | 41 | 29 |