YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1944 | 66.93 | c | 64.07 | 71.90 | 81.38 | i | 90.06 | 94.93 | 102.55 | 103.06 | 97.20 | 89.42 | 69.33 | 68.71 | 83.47 | a | ||||||||||
1945 | 65.35 | 70.82 | 70.23 | a | 82.17 | 89.94 | 96.37 | 102.35 | 100.43 | a | 97.03 | 88.32 | 77.17 | 67.90 | 84.01 | |||||||||||
1946 | 65.32 | 71.29 | 77.87 | 88.50 | 89.87 | 102.13 | 101.19 | 101.35 | 98.37 | 80.77 | a | 70.87 | 70.81 | 84.86 | ||||||||||||
1947 | 65.71 | 76.82 | 77.29 | 83.13 | 92.39 | 96.13 | 105.52 | 99.10 | 99.53 | 88.42 | 69.90 | 63.94 | 84.82 | |||||||||||||
1948 | 71.00 | 67.59 | 69.48 | 85.67 | 92.10 | 97.57 | 102.00 | 102.58 | 99.50 | 86.35 | 72.63 | 64.48 | 84.25 | |||||||||||||
1949 | 54.97 | 66.54 | 75.48 | 85.93 | 89.10 | 98.80 | 101.06 | 102.10 | 99.40 | 84.58 | 86.00 | 66.77 | 84.23 | |||||||||||||
1950 | 66.39 | 75.79 | 79.90 | 87.23 | 89.35 | 99.30 | 98.71 | 103.65 | 95.70 | 95.13 | 83.23 | 76.63 | d | 87.58 | ||||||||||||
1951 | 67.90 | 70.36 | 76.39 | 81.37 | 91.43 | a | 97.57 | 103.55 | 99.50 | i | 100.13 | 89.42 | 74.07 | 65.87 | 83.46 | a | ||||||||||
1952 | 65.10 | 69.69 | 66.87 | 80.93 | a | 95.90 | 98.27 | 103.65 | 104.19 | 101.80 | 97.48 | 70.87 | 64.65 | 84.95 | ||||||||||||
1953 | 73.23 | 71.29 | 77.13 | a | 81.03 | 85.58 | 99.67 | 102.32 | 103.13 | 102.80 | 89.39 | 79.72 | a | 67.97 | 86.10 | |||||||||||
1954 | 69.16 | 79.25 | 74.32 | 88.73 | 92.16 | 98.13 | 101.77 | 100.35 | 100.20 | 91.35 | 81.47 | 70.50 | a | 87.28 | ||||||||||||
1955 | 60.61 | 67.25 | 77.61 | 83.10 | 88.29 | 98.66 | a | 99.13 | 97.32 | 99.90 | 92.97 | 75.67 | 73.13 | 84.47 | ||||||||||||
1956 | 73.06 | 66.07 | 81.58 | 81.40 | 94.13 | 102.27 | 100.90 | a | 101.71 | 103.23 | 87.83 | a | 79.40 | 71.61 | 86.93 | |||||||||||
1957 | 66.06 | 77.39 | 75.71 | 81.69 | a | 85.71 | 101.10 | 105.26 | 101.16 | 100.30 | 82.32 | 69.80 | 72.06 | 84.88 | ||||||||||||
1958 | 69.29 | 72.68 | 69.03 | a | 82.73 | 96.94 | 100.77 | 103.97 | 100.06 | 96.77 | 89.26 | 77.00 | 76.32 | 86.23 | ||||||||||||
1959 | 73.81 | 67.96 | 80.03 | 88.43 | 88.26 | 102.27 | 103.74 | 96.77 | 95.13 | 87.97 | 77.07 | 65.81 | 85.60 | |||||||||||||
1960 | 62.84 | 67.50 | a | 81.52 | 86.03 | 91.87 | 104.87 | 104.71 | 102.10 | 100.20 | 86.10 | 77.87 | 67.00 | 86.05 | ||||||||||||
1961 | 68.97 | 73.61 | 76.58 | 85.83 | 91.00 | 101.87 | 102.52 | 99.00 | 94.37 | 88.00 | 71.87 | 65.61 | 84.93 | |||||||||||||
1962 | 65.29 | 70.79 | 71.33 | a | 90.00 | 89.06 | 98.93 | 102.90 | 105.77 | 96.67 | 87.74 | 80.17 | 70.16 | 85.74 | ||||||||||||
1963 | 65.16 | 77.18 | 75.35 | 81.47 | 94.00 | 95.40 | 104.71 | 98.87 | 100.30 | 90.81 | 75.00 | 70.74 | 85.75 | |||||||||||||
1964 | 65.55 | 68.55 | 72.26 | 80.53 | 90.71 | 98.07 | a | 104.68 | 98.81 | 95.23 | 91.03 | 70.70 | 67.23 | 83.61 | ||||||||||||
1965 | 68.74 | 69.74 | a | 72.19 | 82.04 | b | 89.13 | 93.14 | a | 103.03 | 101.26 | 93.60 | 93.00 | 77.00 | 65.87 | 84.06 | ||||||||||
1966 | 62.37 | a | 63.68 | 77.06 | 84.77 | 93.52 | 100.07 | 102.97 | 101.35 | 95.63 | 86.77 | 77.57 | 69.42 | 84.60 | ||||||||||||
1967 | 70.03 | 74.46 | 79.35 | 77.30 | 90.42 | 95.60 | 103.03 | 103.29 | 94.63 | 91.23 | 80.83 | 60.71 | 85.07 | |||||||||||||
1968 | 66.77 | 73.93 | 74.90 | 82.00 | 91.23 | 101.10 | 101.42 | 97.55 | 98.97 | 90.13 | 76.23 | 67.84 | 85.17 | |||||||||||||
1969 | 70.68 | 67.36 | 73.97 | 85.00 | 93.26 | 95.80 | 102.45 | 104.87 | 99.13 | 84.42 | 74.00 | 70.29 | 85.10 | |||||||||||||
1970 | 69.06 | 74.71 | 73.68 | 78.87 | 93.61 | 100.10 | 103.68 | 101.68 | 95.37 | 84.84 | 78.93 | 68.03 | 85.21 | |||||||||||||
1971 | 70.55 | 72.46 | 81.03 | a | 83.23 | 87.13 | 98.53 | 104.03 | a | 97.35 | 97.57 | 82.77 | a | 76.17 | 64.03 | 84.57 | ||||||||||
1972 | 70.68 | 76.93 | 86.52 | 87.60 | 91.90 | 99.57 | 105.13 | 99.30 | a | 97.17 | 81.45 | 70.67 | 65.71 | 86.05 | ||||||||||||
1973 | 65.58 | 69.86 | 67.37 | a | 81.03 | 93.58 | 101.17 | 103.94 | 102.42 | 98.87 | 91.74 | 76.97 | 72.58 | 85.42 | ||||||||||||
1974 | 67.29 | 73.14 | 78.32 | 85.57 | 92.58 | 104.70 | 101.10 | 102.24 | b | 96.87 | 85.74 | 76.40 | 65.48 | 85.79 | ||||||||||||
1975 | 68.94 | 71.29 | 75.53 | a | 76.23 | 90.07 | c | 99.50 | b | 102.71 | 104.10 | 99.53 | 88.61 | 78.07 | 69.63 | a | 85.35 | |||||||||
1976 | 73.06 | 75.00 | a | 75.77 | 80.60 | 92.35 | 100.87 | 100.10 | 102.42 | 92.93 | 86.06 | 77.41 | a | 70.35 | 85.58 | |||||||||||
1977 | 66.06 | 76.86 | 72.81 | 85.50 | 85.37 | a | 101.93 | 103.03 | 102.94 | 98.30 | 89.52 | 80.23 | 73.74 | 86.36 | ||||||||||||
1978 | 66.84 | 68.36 | 76.61 | 81.80 | 91.68 | 104.30 | 105.13 | 102.77 | 95.73 | 90.16 | 70.50 | 62.19 | 84.67 | |||||||||||||
1979 | 58.87 | 69.29 | 71.77 | 83.80 | 89.55 | 101.33 | 104.61 | 99.55 | 103.24 | a | 91.87 | 75.60 | 73.10 | 85.22 | ||||||||||||
1980 | 68.94 | 73.41 | 72.10 | a | 82.63 | 86.13 | a | 103.00 | a | 106.23 | 102.29 | 99.50 | 89.61 | ----- | z | 76.32 | 87.29 | a | ||||||||
1981 | 72.03 | 75.96 | 74.26 | 86.40 | 89.26 | 103.30 | 103.23 | 104.61 | 99.30 | 84.39 | 81.07 | 74.06 | 87.32 | |||||||||||||
1982 | 67.50 | e | 72.70 | e | 74.35 | e | 85.77 | d | 89.40 | f | 97.72 | a | 101.43 | a | 101.66 | b | 96.92 | f | 87.43 | c | 72.18 | b | 64.67 | g | 84.53 | c |
1983 | 69.03 | b | 69.48 | a | 72.21 | c | 78.10 | i | 92.48 | b | 99.00 | b | 103.63 | d | 98.56 | f | 97.61 | b | 84.72 | b | 74.04 | e | 69.96 | g | 84.69 | c |
1984 | 68.46 | c | 73.71 | e | 82.50 | g | 85.62 | f | 99.84 | 97.28 | a | 99.03 | b | 98.25 | g | 97.68 | b | 81.97 | b | 75.08 | d | 64.04 | e | 84.12 | c | |
1985 | 64.80 | f | 69.21 | d | 76.48 | j | 90.04 | f | 93.70 | d | 104.71 | b | 104.97 | a | 104.13 | 94.30 | 87.48 | 72.69 | a | 69.41 | b | 88.96 | c | |||
1986 | 76.33 | a | 74.57 | 83.58 | 86.71 | b | 95.59 | b | 103.53 | 102.06 | 102.36 | c | 95.00 | 86.67 | a | 77.17 | 68.94 | 87.71 | ||||||||
1987 | 69.16 | 71.14 | 76.32 | 90.37 | 91.10 | 103.43 | 103.74 | 101.68 | 98.20 | 93.13 | a | 75.83 | a | 65.70 | a | 86.65 | ||||||||||
1988 | 68.29 | 76.64 | a | 79.97 | 84.63 | 94.59 | b | 101.93 | a | 103.26 | 101.56 | d | 98.90 | a | 92.73 | a | 77.77 | 69.48 | 87.48 | |||||||
1989 | 66.10 | a | 73.86 | 84.48 | 93.77 | 94.70 | a | 102.76 | a | 105.84 | 100.93 | a | 101.33 | 89.35 | 79.40 | 71.48 | 88.67 | |||||||||
1990 | 68.10 | a | 70.64 | 79.81 | 86.33 | 90.97 | 104.10 | 101.60 | a | 99.48 | 96.53 | 91.39 | 79.17 | 65.61 | 86.14 | |||||||||||
1991 | 68.03 | 78.19 | b | 71.80 | a | 83.52 | a | 90.94 | 98.37 | 102.77 | a | 102.81 | 96.89 | b | 92.43 | a | 77.78 | c | 66.59 | b | 85.84 | |||||
1992 | 67.16 | 72.41 | 74.20 | a | 87.70 | 93.43 | a | 100.93 | 103.48 | b | 99.60 | a | 102.43 | 92.30 | a | 74.34 | a | 64.17 | a | 86.01 | ||||||
1993 | 66.87 | a | 68.23 | b | 79.10 | 88.63 | 95.52 | 102.23 | 102.48 | 101.57 | a | 98.39 | b | 90.30 | a | 75.37 | 70.37 | a | 86.59 | |||||||
1994 | 73.43 | a | 71.18 | 79.33 | a | 86.96 | b | 91.76 | b | 105.30 | 106.63 | d | 104.89 | c | 100.93 | 87.10 | a | 71.44 | c | 67.61 | c | 87.21 | ||||
1995 | 66.93 | b | 76.50 | b | 77.31 | b | 82.43 | b | 88.07 | c | 99.85 | c | 107.70 | d | 105.81 | 101.00 | 93.89 | c | 82.41 | h | 80.14 | q | 89.95 | b | ||
1996 | 76.25 | g | 75.82 | g | 80.74 | d | 89.31 | a | 96.60 | a | 103.89 | b | 105.20 | f | 103.48 | d | 95.82 | b | 90.24 | b | 80.64 | b | 73.28 | b | 90.45 | c |
1997 | 69.38 | b | 73.78 | a | 85.48 | 84.32 | b | 98.68 | 99.19 | d | 104.55 | 104.48 | 100.17 | a | 87.94 | 79.89 | b | 64.93 | a | 87.73 | ||||||
1998 | 70.77 | 66.39 | 75.00 | 81.23 | 88.67 | a | 99.27 | 106.40 | a | 105.35 | 99.40 | 88.74 | 79.68 | b | 68.97 | a | 85.82 | |||||||||
1999 | 74.97 | 78.14 | 80.38 | g | 80.10 | 91.67 | a | 99.93 | 101.10 | 102.45 | 99.55 | a | 96.17 | a | 85.70 | 71.21 | b | 89.18 | a | |||||||
2000 | 75.27 | a | 76.07 | 77.46 | c | 90.13 | g | 97.62 | b | 101.77 | 104.39 | 101.33 | a | 101.72 | a | 84.33 | a | 70.10 | 73.97 | 87.64 | a | |||||
2001 | 66.77 | 69.36 | 77.87 | 83.13 | 98.87 | 102.87 | 102.03 | 102.87 | 102.15 | d | 91.29 | 80.21 | a | 67.00 | d | 87.04 | ||||||||||
2002 | 70.16 | 76.43 | 77.69 | e | 87.26 | c | 92.90 | 103.32 | e | 102.50 | c | 103.32 | c | 99.08 | e | 85.54 | e | 79.10 | 68.90 | b | 87.18 | |||||
2003 | 77.57 | a | 70.68 | 77.20 | a | 81.79 | b | 94.93 | a | 99.60 | 104.33 | d | 102.10 | 99.41 | a | 92.10 | 73.66 | a | 70.50 | c | 86.99 | |||||
2004 | 68.94 | 68.71 | a | 84.79 | b | 83.27 | d | 93.93 | a | 99.40 | 102.86 | c | 101.76 | f | 97.04 | b | 84.23 | a | 70.93 | b | 67.39 | 83.77 | a | |||
2005 | 67.84 | 66.59 | a | 75.65 | e | 85.34 | a | 94.10 | b | 99.23 | 105.03 | 100.65 | 99.50 | 87.65 | 81.00 | b | 72.39 | c | 86.25 | |||||||
2006 | 73.07 | a | 75.96 | 73.23 | 83.71 | b | 94.58 | 103.70 | 103.34 | b | 100.77 | 95.00 | 86.30 | a | 81.69 | d | 69.92 | f | 88.31 | a | ||||||
2007 | 64.76 | b | 73.25 | 82.55 | b | 84.70 | 93.18 | c | 101.17 | 101.00 | a | 102.19 | 97.10 | a | 89.76 | b | 82.46 | d | 64.53 | a | 86.39 | |||||
2008 | 66.60 | a | 71.18 | a | 80.26 | 87.23 | 89.53 | a | 103.30 | 100.93 | a | 98.97 | 97.43 | b | 91.57 | a | 80.90 | a | 67.67 | a | 86.30 | |||||
2009 | 73.39 | 74.32 | 79.60 | a | 83.03 | a | 95.87 | 95.00 | 105.35 | 103.72 | b | 99.47 | 85.31 | b | 81.86 | a | 66.52 | b | 86.95 | |||||||
2010 | 69.90 | a | 70.29 | 75.00 | 82.08 | d | 89.00 | d | 100.17 | f | 103.04 | e | 102.73 | a | 102.54 | f | 87.67 | a | 76.50 | b | 73.15 | d | 82.93 | b | ||
2011 | 70.30 | a | 68.41 | a | 81.82 | n | 86.46 | b | 90.39 | c | 100.79 | a | 104.77 | r | 104.74 | d | 100.29 | b | 91.19 | 72.75 | j | 63.42 | 86.22 | c | ||
2012 | 72.97 | 72.32 | a | 80.84 | f | 88.83 | g | 96.23 | e | 102.24 | i | 102.29 | 103.17 | a | 97.00 | c | 89.38 | j | 81.67 | c | 68.79 | c | 86.80 | d | ||
2013 | 66.71 | 69.04 | 83.07 | a | 85.89 | b | 92.37 | a | 103.31 | d | 102.17 | b | 101.76 | f | 97.21 | a | 86.55 | 77.53 | 68.20 | a | 84.73 | a | ||||
2014 | 75.65 | 78.25 | 81.68 | 87.36 | b | 94.80 | a | 102.70 | 102.94 | 100.32 | 98.53 | 91.13 | 78.93 | b | 70.23 | a | 88.54 | |||||||||
2015 | 71.19 | 78.73 | b | 84.71 | c | 85.26 | c | 88.28 | b | 103.32 | b | 102.81 | d | 104.93 | c | 101.00 | h | 91.06 | 79.10 | j | 71.96 | c | 88.23 | b | ||
2016 | 69.83 | b | 83.73 | c | 85.17 | b | 85.40 | 90.81 | d | 106.29 | f | 104.76 | j | 102.81 | 99.90 | j | 95.24 | j | 84.89 | l | 72.92 | e | 84.38 | e | ||
2017 | 67.47 | n | 75.76 | c | 85.04 | f | 89.27 | h | 93.41 | d | 104.78 | c | 103.71 | 103.94 | 96.47 | 94.39 | 85.45 | a | 74.83 | a | 92.53 | c | ||||
2018 | 78.74 | d | 72.04 | 80.16 | 90.50 | b | 93.13 | 102.07 | 104.70 | a | 102.97 | a | 101.81 | c | 82.66 | b | 76.59 | c | 68.16 | 87.79 | ||||||
2019 | 69.52 | b | 65.52 | a | 76.10 | a | 87.47 | 86.23 | a | 101.40 | 105.06 | 107.30 | a | 98.37 | 90.29 | 81.10 | a | 67.26 | 86.30 | |||||||
2020 | 69.68 | 71.85 | c | 73.71 | c | 86.40 | 98.00 | i | 102.36 | h | 106.39 | h | 108.65 | k | 103.00 | i | 96.32 | 84.54 | f | 72.96 | d | 78.49 | f | |||
2021 | 70.32 | c | 75.36 | f | 77.73 | e | 89.72 | e | 93.55 | k | 105.45 | j | 99.41 | n | 102.41 | b | 99.10 | 87.23 | a | 85.60 | 71.37 | a | 85.44 | d | ||
2022 | 71.46 | c | 74.71 | 81.58 | 89.27 | 94.74 | 103.34 | a | 103.84 | 100.52 | 99.07 | 88.92 | f | 73.90 | a | 67.87 | a | 87.30 | a | |||||||
2023 | 65.10 | 67.62 | b | 74.42 | 88.57 | 91.58 | 98.33 | 108.57 | c | 104.58 | 99.90 | 92.87 | 80.69 | a | 73.79 | b | 87.17 | |||||||||
2024 | 67.94 | 71.76 | 74.12 | o | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 69.85 | j | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 68.75 | 72.13 | 76.95 | 84.74 | 91.99 | 100.53 | 103.26 | 102.03 | 98.40 | 88.84 | 77.10 | 68.98 | 85.98 | |||||||||||||
S.D. | 3.95 | 3.97 | 4.39 | 3.31 | 3.16 | 2.77 | 1.86 | 2.17 | 2.35 | 3.62 | 4.19 | 3.53 | 1.19 | |||||||||||||
SKEW | -0.28 | 0.19 | 0.06 | 0.01 | 0.08 | -0.40 | 0.10 | -0.27 | -0.09 | -0.03 | -0.01 | 0.10 | 0.18 | |||||||||||||
MAX | 78.74 | 83.73 | 86.52 | 93.77 | 99.84 | 105.30 | 108.57 | 107.30 | 103.24 | 97.48 | 86.00 | 76.63 | 88.67 | |||||||||||||
MIN | 54.97 | 63.68 | 66.87 | 76.23 | 85.37 | 93.14 | 98.71 | 96.77 | 92.93 | 80.77 | 69.33 | 60.71 | 83.61 | |||||||||||||
YRS | 78 | 79 | 74 | 73 | 77 | 75 | 75 | 74 | 75 | 77 | 74 | 76 | 57 |