YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1955 | ----- | z | 61.04 | 69.03 | 72.20 | 83.42 | 92.50 | 97.77 | 102.90 | 95.37 | 83.03 | 66.00 | 58.74 | 80.18 | a | |||||||||||
1956 | 58.06 | 58.72 | 69.29 | 73.90 | 84.77 | 95.03 | 100.61 | 96.74 | 94.13 | 78.55 | 70.33 | 58.29 | 78.20 | |||||||||||||
1957 | 52.90 | 61.71 | 67.60 | a | 75.20 | 81.06 | 98.00 | 101.87 | 97.68 | 92.13 | 76.52 | 64.77 | 54.06 | 76.96 | ||||||||||||
1958 | 57.32 | 64.00 | 62.06 | 73.57 | 88.23 | 91.30 | 98.65 | 101.67 | g | 92.47 | 87.16 | 69.87 | 64.77 | 77.22 | a | |||||||||||
1959 | 60.16 | 61.54 | 73.00 | 83.23 | 83.16 | 97.87 | 105.32 | 98.26 | 89.77 | 83.23 | 73.13 | 62.00 | 80.89 | |||||||||||||
1960 | 57.19 | 60.90 | 71.52 | b | 76.13 | 83.55 | 102.53 | 104.42 | 100.13 | 96.17 | 80.03 | 63.97 | 54.06 | 79.22 | ||||||||||||
1961 | 52.06 | 64.46 | 67.74 | 79.23 | 81.39 | 99.87 | 104.52 | 100.52 | 90.73 | 82.42 | 66.37 | 52.13 | 78.45 | |||||||||||||
1962 | 49.84 | 56.00 | 63.58 | 81.30 | 81.39 | 94.97 | 101.74 | 99.61 | 93.63 | 78.55 | 70.60 | 59.48 | 77.56 | |||||||||||||
1963 | 54.61 | 66.50 | 67.35 | 68.30 | 83.03 | 90.57 | 98.16 | 97.65 | 91.70 | 79.26 | 63.77 | 47.42 | 75.69 | |||||||||||||
1964 | 55.00 | 62.72 | 67.19 | 74.93 | 81.29 | 92.00 | 100.55 | 98.94 | 88.87 | 85.10 | 62.27 | 59.58 | 77.37 | |||||||||||||
1965 | 54.03 | 62.14 | 68.87 | 71.80 | 83.37 | a | 85.93 | 96.39 | 97.62 | b | 85.97 | 83.97 | 66.30 | 48.81 | 75.43 | |||||||||||
1966 | 55.03 | a | 58.89 | 68.26 | 79.40 | 87.45 | 91.93 | 96.23 | 101.13 | 89.53 | 79.65 | 65.67 | 49.70 | a | 76.91 | |||||||||||
1967 | 51.58 | ----- | z | ----- | z | 63.30 | 83.63 | a | 84.63 | ----- | z | 104.68 | 94.30 | 83.48 | 70.40 | 53.94 | 76.66 | c | ||||||||
1968 | 55.13 | a | 64.34 | 70.19 | 77.59 | a | 84.71 | 95.23 | d | 102.00 | 95.32 | 92.67 | f | 79.87 | 62.60 | j | 55.06 | 77.95 | b | |||||||
1969 | 52.03 | 58.25 | 66.71 | 74.47 | 87.16 | 89.87 | 100.61 | 100.65 | 94.77 | 78.71 | 70.73 | 62.00 | 78.00 | |||||||||||||
1970 | 62.06 | 64.79 | 68.68 | 73.61 | b | 87.83 | a | 92.60 | 102.06 | 99.48 | 92.73 | 81.58 | 70.17 | 60.00 | p | 81.42 | a | |||||||||
1971 | 55.41 | b | 58.86 | 68.87 | 73.83 | 80.63 | a | 92.90 | 100.93 | a | 100.81 | 92.00 | a | 78.14 | b | 66.11 | b | 54.67 | a | 76.93 | ||||||
1972 | 48.13 | 64.62 | 75.93 | a | 76.57 | 87.81 | 94.90 | a | 101.27 | a | 97.32 | 88.67 | 77.03 | 59.97 | a | 49.10 | a | 76.78 | ||||||||
1973 | 55.42 | 62.04 | 60.81 | 75.83 | 90.03 | 96.13 | 99.42 | 97.57 | a | 90.21 | a | 80.45 | b | 66.31 | a | 58.55 | b | 77.73 | ||||||||
1974 | 56.93 | c | 63.07 | a | 68.73 | a | 75.19 | d | 86.87 | a | 94.70 | 95.33 | m | 98.24 | f | 98.62 | a | 70.86 | x | 67.79 | b | 57.27 | t | 76.49 | d | |
1975 | 53.27 | i | 61.14 | 64.42 | 69.54 | d | 85.58 | 91.34 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 74.41 | g | |||
1976 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1977 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1978 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1979 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1980 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1981 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1982 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1983 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1984 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1985 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1986 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1987 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1988 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1989 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1990 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1997 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1998 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1999 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2000 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2001 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 81.79 | g | 69.44 | c | 56.61 | 63.03 | j | |
2002 | 53.89 | m | 65.64 | c | 67.89 | c | 77.05 | i | 85.45 | 94.92 | d | 100.22 | d | 97.30 | k | 93.52 | e | 79.76 | f | 68.21 | a | 62.54 | g | 82.27 | e | |
2003 | 56.40 | a | 59.71 | g | 71.28 | b | 71.13 | 82.68 | 93.81 | d | 99.64 | f | 94.97 | 94.12 | f | 86.60 | a | 62.04 | c | 59.46 | c | 75.37 | c | |||
2004 | 54.59 | i | 49.60 | x | 77.85 | e | 79.52 | g | 86.03 | b | 93.32 | b | 99.03 | 97.00 | 92.86 | a | 79.23 | a | 61.31 | d | 54.93 | b | 82.40 | c | ||
2005 | 53.20 | a | 63.12 | b | 68.53 | a | 73.23 | 82.84 | 88.34 | a | 101.41 | b | 99.13 | 88.57 | 79.81 | d | 70.15 | c | 61.17 | a | 77.46 | |||||
2006 | 58.13 | 65.42 | b | 62.38 | b | 69.61 | b | 87.14 | b | 95.48 | a | 101.52 | 94.68 | c | 90.96 | d | 77.93 | c | 67.07 | a | 58.63 | a | 77.41 | |||
2007 | 57.35 | 64.22 | a | 74.79 | b | 77.50 | d | 87.42 | 92.93 | b | 96.97 | 97.03 | 87.13 | 77.39 | 70.31 | a | 55.97 | 78.25 | ||||||||
2008 | 56.39 | 62.45 | 70.90 | 76.10 | 84.23 | a | 94.27 | 98.76 | b | 101.29 | c | 93.77 | 82.97 | b | 69.23 | 53.30 | a | 78.64 | ||||||||
2009 | 57.33 | d | 61.96 | b | 69.26 | d | 76.62 | a | 90.54 | c | 90.67 | c | 101.43 | a | 98.19 | 96.21 | a | 76.24 | b | 67.10 | a | 55.87 | a | 78.45 | ||
2010 | 55.55 | 61.04 | a | 68.45 | 69.33 | c | 78.43 | a | 92.21 | a | 98.47 | a | 96.64 | c | 91.47 | 80.47 | a | 66.00 | 59.45 | 76.46 | ||||||
2011 | 52.00 | a | 59.89 | 64.74 | 74.47 | 78.87 | 87.47 | 96.19 | 96.87 | 93.83 | 80.81 | 62.87 | 57.52 | 75.46 | ||||||||||||
2012 | 60.84 | 63.90 | 67.68 | 74.83 | 86.26 | 91.30 | 96.87 | 100.74 | 94.83 | 80.87 | 68.83 | 58.16 | 78.76 | |||||||||||||
2013 | 56.71 | 62.64 | 72.94 | 79.67 | 85.13 | a | 93.93 | 101.71 | 96.68 | 89.97 | 79.61 | 69.30 | 59.39 | 78.97 | ||||||||||||
2014 | 66.16 | 66.04 | 73.10 | 77.87 | 88.07 | a | 94.87 | 101.03 | 98.94 | 94.50 | 84.26 | 69.53 | 60.71 | 81.26 | ||||||||||||
2015 | 56.87 | 69.86 | 77.68 | 79.00 | 82.29 | 96.63 | 96.87 | 98.35 | 94.00 | 84.03 | 64.80 | 57.10 | 79.79 | |||||||||||||
2016 | 59.10 | 67.34 | 71.16 | 79.13 | 84.03 | 96.32 | b | 100.61 | 99.55 | 92.87 | 80.77 | 69.97 | a | 58.61 | 79.96 | |||||||||||
2017 | 56.13 | 63.18 | 70.03 | 74.59 | a | 85.23 | 94.71 | b | 101.20 | a | 100.07 | c | 92.65 | d | 82.86 | c | 69.96 | f | 60.24 | j | 82.06 | b | ||||
2018 | 60.22 | h | 64.09 | e | 67.57 | h | 80.05 | i | 84.38 | e | 94.41 | h | 101.15 | e | 98.67 | m | 93.28 | e | 82.79 | c | 69.80 | e | 58.62 | g | 82.58 | f |
2019 | 61.15 | e | 58.12 | d | 68.79 | g | 85.73 | o | 78.86 | i | 93.89 | b | 99.03 | a | 100.12 | g | 90.79 | k | 80.08 | f | 70.48 | c | 57.68 | i | 76.54 | g |
2020 | 57.92 | e | 68.36 | o | 68.00 | n | 74.96 | g | 86.63 | d | 92.70 | 99.24 | b | 101.04 | c | 96.62 | q | 86.72 | f | 67.80 | e | 60.21 | c | 80.79 | e | |
2021 | 62.07 | c | 65.50 | 70.10 | j | 80.33 | c | 86.93 | d | 96.23 | d | 103.04 | d | 98.52 | h | 93.89 | b | 78.38 | g | 67.70 | 56.61 | 79.14 | c | |||
2022 | 60.11 | c | 65.85 | a | 72.88 | e | 77.07 | b | 83.87 | h | 96.04 | f | 100.14 | c | 102.22 | h | 92.35 | j | 87.00 | i | 67.54 | q | 58.12 | o | 75.21 | g |
2023 | 60.38 | r | 60.41 | f | 62.56 | f | 75.58 | f | 82.38 | g | 86.70 | g | 100.54 | e | 99.47 | l | 89.70 | t | 83.88 | n | 70.61 | l | 64.25 | o | 100.54 | k |
2024 | 60.70 | k | 64.95 | h | 70.70 | k | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 56.39 | 62.79 | 69.23 | 75.12 | 84.72 | 93.47 | 100.20 | 98.77 | 92.39 | 80.95 | 67.34 | 56.75 | 77.96 | |||||||||||||
S.D. | 3.65 | 2.88 | 3.96 | 4.01 | 2.84 | 3.46 | 2.27 | 2.22 | 2.69 | 2.78 | 3.08 | 4.02 | 1.51 | |||||||||||||
SKEW | 0.19 | -0.11 | 0.11 | -0.58 | -0.16 | -0.18 | 0.03 | 0.37 | -0.28 | 0.33 | -0.56 | -0.55 | 0.32 | |||||||||||||
MAX | 66.16 | 69.86 | 77.85 | 83.23 | 90.54 | 102.53 | 105.32 | 104.68 | 98.62 | 87.16 | 73.13 | 64.77 | 81.26 | |||||||||||||
MIN | 48.13 | 56.00 | 60.81 | 63.30 | 78.43 | 84.63 | 96.19 | 94.68 | 85.97 | 76.24 | 59.97 | 47.42 | 75.43 | |||||||||||||
YRS | 37 | 38 | 37 | 37 | 40 | 40 | 39 | 34 | 36 | 35 | 39 | 35 | 26 |