YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1972 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 50.23 | a | 50.23 | k |
1973 | 49.71 | 58.50 | 61.06 | 75.70 | 91.27 | a | 101.00 | 108.54 | c | 104.94 | 95.89 | b | 83.71 | 64.66 | a | 57.97 | b | 79.41 | ||||||||
1974 | 49.53 | a | 60.73 | b | 72.00 | c | 78.36 | b | 93.03 | 106.40 | 105.40 | a | 104.77 | 98.82 | b | 82.83 | a | 64.63 | c | 53.14 | b | 80.80 | ||||
1975 | 54.27 | a | 58.72 | c | 65.03 | a | 70.28 | a | 86.41 | d | 98.80 | 105.59 | i | 103.81 | d | 97.11 | b | 81.07 | a | 65.70 | 58.55 | b | 76.34 | a | ||
1976 | 58.45 | b | 63.59 | 66.97 | a | 76.00 | a | 92.90 | 99.34 | a | 105.68 | 101.52 | 91.54 | b | 78.21 | b | 68.57 | 57.58 | 80.03 | |||||||
1977 | 54.70 | d | 67.00 | a | 65.00 | c | 81.96 | c | 80.66 | b | 102.43 | 106.77 | 104.40 | a | 95.73 | 85.52 | 68.27 | 60.67 | a | 81.09 | ||||||
1978 | 55.07 | a | 60.96 | 70.03 | 75.28 | a | 87.13 | 101.64 | b | 107.19 | 104.16 | 92.40 | 86.42 | 62.47 | 50.26 | 79.42 | ||||||||||
1979 | 47.00 | 56.36 | 67.87 | 78.93 | 89.29 | 100.80 | 106.87 | 100.42 | 101.37 | 86.42 | 63.97 | 58.47 | a | 79.81 | ||||||||||||
1980 | 57.58 | 62.97 | 65.48 | 78.20 | 83.61 | 99.97 | a | 106.61 | 104.35 | 96.23 | 83.81 | 68.77 | 63.87 | a | 80.95 | |||||||||||
1981 | 61.67 | a | 63.39 | 67.16 | 83.57 | 87.74 | 104.57 | 107.94 | 105.68 | 96.27 | 78.61 | 69.57 | 59.73 | a | 82.16 | |||||||||||
1982 | 55.13 | a | 61.36 | 67.13 | 77.30 | 88.16 | 98.40 | 103.39 | 102.42 | 92.77 | 76.48 | 61.83 | 53.13 | a | 78.13 | |||||||||||
1983 | 56.30 | a | 61.00 | 67.06 | 71.43 | 87.65 | 99.07 | 104.58 | 99.16 | 97.17 | 80.97 | 66.47 | 55.74 | 78.88 | ||||||||||||
1984 | 57.90 | a | 62.07 | 71.97 | 76.77 | 96.31 | b | 98.40 | 101.81 | 99.35 | 97.45 | a | 76.03 | a | 66.71 | b | 53.10 | a | 79.82 | |||||||
1985 | 55.84 | 57.70 | a | 68.10 | a | 84.30 | 91.70 | a | 102.97 | a | 106.06 | 104.32 | 88.97 | 80.27 | a | 63.14 | a | 60.17 | a | 80.29 | ||||||
1986 | 65.83 | a | 65.61 | 75.42 | 79.60 | 90.87 | a | 102.87 | 101.52 | 104.94 | 88.43 | 78.71 | c | 67.83 | 57.90 | b | 81.63 | |||||||||
1987 | 54.90 | 61.64 | 65.52 | 82.43 | 87.97 | 101.70 | 101.55 | 103.33 | a | 96.81 | d | 86.82 | c | 64.60 | 52.50 | a | 79.98 | |||||||||
1988 | 53.75 | c | 65.73 | c | 70.14 | b | 78.56 | e | 87.30 | h | 99.29 | f | 107.52 | b | 101.00 | b | 93.55 | a | 89.89 | d | 66.78 | g | 58.39 | c | 79.84 | c |
1989 | 54.17 | b | 60.50 | d | 75.77 | i | 88.86 | h | 89.81 | e | 99.21 | b | 107.03 | b | 100.61 | c | 96.28 | e | 87.72 | m | 71.43 | g | 61.00 | 83.58 | d | |
1990 | 56.65 | 57.60 | c | 72.22 | d | 81.28 | a | 86.15 | d | 101.67 | f | 104.19 | 101.46 | e | 96.68 | h | 83.18 | c | 68.07 | a | 51.82 | i | 78.98 | c | ||
1991 | 55.83 | h | 69.17 | j | 61.96 | f | 77.04 | g | 84.09 | h | 95.17 | g | 104.36 | f | 102.52 | f | 93.81 | i | 85.75 | c | 65.48 | c | 56.50 | c | 69.24 | i |
1992 | 56.45 | i | 62.76 | d | 66.86 | i | 82.71 | f | 91.21 | g | 96.83 | a | 101.21 | c | 103.34 | b | 96.85 | d | 84.00 | d | 63.17 | f | 51.88 | f | 90.83 | f |
1993 | 52.89 | d | 57.83 | j | 71.35 | h | 80.24 | i | 90.22 | h | 98.07 | c | 102.67 | a | 102.17 | b | 96.25 | b | 83.14 | j | 62.25 | f | 57.11 | d | 84.86 | f |
1994 | 61.04 | g | 58.25 | h | 75.30 | d | 83.00 | j | 89.79 | c | 105.03 | a | 107.75 | c | 106.09 | h | 97.32 | b | 79.44 | d | 60.03 | a | 57.68 | l | 87.81 | e |
1995 | 56.68 | i | 71.32 | c | 68.78 | h | 77.93 | a | 83.71 | c | 94.00 | b | 106.57 | c | 106.52 | 98.77 | d | 84.12 | f | 74.00 | a | 61.72 | b | 86.06 | c | |
1996 | 59.71 | c | 67.25 | a | 71.72 | b | 84.07 | c | 95.12 | f | 103.83 | a | 107.27 | a | 106.36 | c | 94.61 | b | 82.50 | a | 69.48 | i | 57.40 | f | 86.37 | c |
1997 | 58.12 | e | 65.48 | c | 75.92 | e | 76.79 | f | 97.04 | f | 98.79 | b | 103.60 | f | 104.03 | a | 95.41 | c | 82.07 | c | 68.66 | a | 56.79 | c | 78.36 | c |
1998 | 59.63 | a | 58.60 | c | 69.71 | 74.62 | a | 84.68 | c | 94.37 | c | 105.32 | c | 105.87 | a | 93.92 | f | 79.75 | c | 66.60 | e | 58.89 | c | 78.00 | a | |
1999 | 62.08 | g | 64.45 | f | 74.64 | f | 71.32 | b | 86.45 | b | 97.17 | a | ----- | z | 101.62 | b | 96.19 | c | 86.57 | a | 72.92 | d | 61.12 | e | 84.17 | d |
2000 | 60.37 | a | 64.54 | a | 69.81 | d | 84.68 | b | 93.68 | c | 101.35 | d | 105.80 | a | 103.77 | a | 96.03 | 79.62 | b | 60.56 | c | 61.63 | d | 81.82 | ||
2001 | 57.11 | c | 60.65 | b | 70.15 | e | 78.15 | c | 94.85 | d | 101.69 | a | 104.35 | 105.03 | a | 99.38 | a | 86.26 | 71.38 | a | 55.10 | a | 82.01 | |||
2002 | 56.70 | a | 64.42 | b | 68.79 | b | 82.75 | b | 88.83 | b | 102.57 | 107.57 | a | 103.73 | a | 96.63 | 79.70 | a | 68.37 | 56.28 | b | 81.36 | ||||
2003 | 65.96 | c | 61.79 | d | 68.93 | d | 76.65 | d | 90.54 | c | 100.67 | 109.41 | d | 103.23 | e | 98.19 | c | 88.59 | d | 62.62 | d | 57.84 | 82.03 | |||
2004 | 57.52 | b | 56.64 | d | 77.19 | d | 79.52 | a | 91.24 | f | 101.39 | g | 105.04 | c | 102.47 | a | 95.36 | b | 78.96 | e | 62.72 | e | 58.25 | c | 77.37 | b |
2005 | 59.13 | a | 62.04 | b | 69.77 | e | 76.27 | d | 82.38 | o | 97.25 | f | 107.60 | f | 99.18 | c | 94.62 | a | 81.47 | a | 69.77 | d | 59.43 | c | 74.63 | c |
2006 | 61.81 | e | 65.04 | b | 65.63 | a | 78.62 | d | 93.34 | b | 103.60 | 106.31 | b | 103.88 | e | 92.72 | a | 78.00 | b | 69.85 | d | 57.46 | e | 81.36 | ||
2007 | 54.05 | i | 64.20 | c | 76.81 | d | 81.03 | 93.48 | d | 103.22 | c | 107.83 | a | 104.32 | 96.39 | b | 81.57 | a | 72.31 | a | 52.81 | 84.91 | a | |||
2008 | 54.39 | c | 60.72 | 71.59 | d | 79.93 | 86.39 | 101.87 | 105.83 | a | 105.68 | 97.66 | a | 83.96 | c | 71.04 | c | 54.10 | 81.10 | |||||||
2009 | 60.69 | e | 61.29 | 71.58 | e | 77.52 | a | 95.19 | 95.28 | a | 107.97 | a | 104.33 | a | 99.50 | 78.35 | 70.63 | 54.27 | a | 81.38 | ||||||
2010 | 56.90 | 59.86 | 67.16 | 74.70 | 82.53 | a | 99.47 | 108.16 | 103.42 | 99.17 | 82.77 | 67.93 | 59.35 | 80.12 | ||||||||||||
2011 | 58.13 | 60.32 | 69.00 | 77.80 | 83.13 | 98.27 | 103.55 | 107.06 | 99.07 | 82.47 | a | 66.00 | 56.67 | a | 80.12 | |||||||||||
2012 | 62.65 | 64.93 | a | 72.13 | 80.87 | 93.03 | 102.77 | 104.70 | a | 104.97 | b | 97.77 | 84.67 | a | 72.93 | 58.07 | b | 83.29 | ||||||||
2013 | 57.13 | 62.75 | 75.65 | 81.77 | 90.65 | 104.04 | c | 106.14 | b | 100.82 | c | 92.53 | 79.57 | a | 68.67 | 57.10 | a | 81.40 | ||||||||
2014 | 63.93 | b | 66.26 | a | 73.17 | a | 80.97 | 90.64 | f | 102.72 | e | 104.90 | 99.16 | 98.80 | 87.70 | a | 70.20 | 57.65 | 82.31 | a | ||||||
2015 | 61.06 | 70.18 | 77.74 | 81.14 | a | 84.90 | 103.77 | 101.87 | 104.55 | 99.47 | 85.93 | a | 65.73 | 55.19 | 82.63 | |||||||||||
2016 | 55.13 | 69.03 | 74.61 | 78.37 | 85.65 | 105.13 | 106.81 | 102.61 | 95.00 | 85.81 | 73.44 | e | 56.17 | b | 82.31 | |||||||||||
2017 | 55.57 | a | 63.64 | 77.14 | b | 80.62 | f | 88.44 | f | 104.47 | 106.61 | 104.06 | 93.53 | 85.42 | 75.21 | b | 63.17 | a | 82.88 | b | ||||||
2018 | 62.44 | d | 63.71 | 68.87 | 86.77 | d | 90.48 | d | 103.27 | 107.27 | e | 105.50 | a | 99.79 | p | 80.34 | b | 68.00 | c | 58.93 | c | 81.42 | a | |||
2019 | 56.93 | q | 54.50 | d | 68.61 | c | 82.04 | b | 81.19 | 98.71 | b | 106.00 | d | 106.90 | a | 102.20 | t | ----- | z | 70.07 | a | 55.67 | g | 83.50 | d | |
2020 | 58.48 | h | 63.30 | f | 67.36 | i | 79.70 | g | 93.79 | c | 100.43 | b | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 62.82 | n | 97.11 | j |
2021 | 60.07 | c | 65.08 | d | 68.85 | e | 84.25 | j | 93.83 | h | 105.59 | h | 107.68 | 105.72 | b | ----- | z | ----- | z | ----- | z | 60.50 | c | 77.98 | f | |
2022 | ----- | z | ----- | z | ----- | z | ----- | z | 91.10 | b | 102.67 | 107.19 | 102.97 | 100.83 | f | 87.13 | a | 59.40 | ----- | z | 91.74 | f | ||||
2023 | 50.97 | 56.04 | 60.94 | 79.43 | 90.03 | 94.60 | 110.03 | 101.10 | a | 93.43 | 85.13 | 69.93 | 63.68 | 79.61 | ||||||||||||
2024 | 58.06 | 62.21 | 68.44 | m | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 60.14 | j | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 57.31 | 62.41 | 70.11 | 78.95 | 88.95 | 100.80 | 105.88 | 103.44 | 95.99 | 82.72 | 67.49 | 57.51 | 80.82 | |||||||||||||
S.D. | 4.10 | 3.67 | 4.14 | 3.65 | 4.03 | 3.04 | 2.16 | 2.11 | 2.78 | 3.45 | 3.87 | 3.27 | 1.22 | |||||||||||||
SKEW | -0.13 | 0.14 | 0.01 | -0.29 | -0.22 | -0.47 | -0.60 | -0.46 | -0.71 | 0.01 | -0.17 | -0.23 | -0.12 | |||||||||||||
MAX | 65.96 | 71.32 | 77.74 | 86.77 | 96.31 | 106.40 | 110.03 | 107.06 | 101.37 | 89.89 | 75.21 | 63.87 | 83.29 | |||||||||||||
MIN | 47.00 | 54.50 | 60.94 | 70.28 | 80.66 | 94.00 | 101.21 | 99.16 | 88.43 | 76.03 | 59.40 | 50.23 | 78.13 | |||||||||||||
YRS | 43 | 46 | 43 | 41 | 40 | 45 | 45 | 48 | 43 | 45 | 44 | 45 | 28 |