YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 105.90 | a | 104.52 | 101.67 | 89.45 | 72.73 | 63.94 | 89.70 | f | |||||
1949 | 52.81 | 65.57 | 74.42 | 84.83 | 92.26 | 100.83 | 103.71 | 103.68 | 100.72 | a | 84.39 | 82.27 | 65.84 | 84.28 | ||||||||||||
1950 | 63.81 | 72.61 | 76.81 | 88.24 | a | 92.32 | 101.73 | 102.06 | 103.97 | 96.83 | 95.48 | 81.53 | 74.97 | 87.53 | ||||||||||||
1951 | 66.35 | 68.43 | 75.19 | 81.43 | 91.90 | 100.47 | 106.29 | 100.19 | 99.73 | 89.16 | 72.63 | 64.42 | 84.68 | |||||||||||||
1952 | 63.29 | 68.92 | c | 67.52 | 80.53 | 95.43 | a | 101.23 | 103.10 | 102.13 | 100.17 | 95.58 | 70.57 | 63.93 | b | 84.37 | ||||||||||
1953 | 69.58 | 70.14 | 76.03 | 82.30 | 86.13 | 101.47 | 103.03 | 103.58 | 102.93 | 89.65 | 78.83 | 66.58 | 85.85 | |||||||||||||
1954 | 67.65 | 78.89 | 73.81 | 90.47 | 94.84 | 100.50 | 103.59 | b | 101.42 | 101.00 | 92.19 | 81.80 | 69.16 | 87.94 | ||||||||||||
1955 | 59.84 | 66.96 | 77.23 | 83.43 | 90.84 | 100.83 | 101.55 | 99.19 | 101.13 | 94.94 | 76.57 | 72.23 | 85.39 | |||||||||||||
1956 | 71.19 | 65.45 | 80.42 | 83.60 | 95.39 | 104.80 | 103.68 | 102.55 | 103.63 | 89.48 | 76.43 | 70.29 | 87.24 | |||||||||||||
1957 | 63.74 | 74.18 | 76.16 | 82.60 | 88.90 | 103.57 | 105.23 | 101.74 | 100.57 | 83.74 | 70.37 | 69.67 | a | 85.04 | ||||||||||||
1958 | 68.84 | 71.61 | 69.00 | 82.93 | 98.39 | 102.60 | 106.61 | 102.87 | 99.13 | 89.52 | 75.80 | 74.42 | 86.81 | |||||||||||||
1959 | 70.32 | 67.61 | 79.42 | 89.47 | 91.87 | 105.63 | 106.10 | b | 100.35 | 99.37 | 88.84 | 75.37 | 65.71 | 86.67 | ||||||||||||
1960 | 60.77 | 65.55 | 80.55 | 86.93 | 94.68 | 105.63 | 106.81 | 102.87 | 102.77 | 84.97 | 76.77 | 67.23 | 86.29 | |||||||||||||
1961 | 69.58 | 73.25 | 76.52 | 86.30 | 93.68 | 104.53 | 104.71 | 102.13 | 96.47 | 88.42 | 71.50 | 65.10 | 86.01 | |||||||||||||
1962 | 64.55 | 69.64 | 71.65 | 91.33 | 91.35 | 102.07 | 105.58 | 108.29 | 98.80 | 90.71 | 80.47 | 70.26 | 87.06 | |||||||||||||
1963 | 64.00 | 76.57 | 76.74 | 82.33 | 97.81 | 100.24 | a | 107.39 | 101.16 | 101.97 | 92.23 | 75.77 | 69.97 | 87.18 | ||||||||||||
1964 | 64.42 | 67.86 | 72.90 | 84.00 | a | 92.90 | 101.73 | 106.03 | 100.42 | 97.07 | 92.77 | 71.80 | 67.48 | 84.95 | ||||||||||||
1965 | 66.39 | 69.50 | 73.45 | 82.13 | 91.71 | 98.17 | 107.00 | 106.84 | 97.77 | 93.52 | 76.93 | 65.13 | 85.71 | |||||||||||||
1966 | 63.55 | 65.43 | 79.32 | 90.03 | ----- | z | 105.23 | 108.32 | 105.90 | 98.07 | 89.65 | 78.67 | 68.45 | 86.60 | a | |||||||||||
1967 | 67.90 | 75.54 | 80.90 | 80.57 | 94.65 | 99.07 | 106.35 | 105.61 | 100.30 | 92.16 | 80.43 | 61.29 | 87.06 | |||||||||||||
1968 | 66.97 | 74.00 | 76.90 | a | 84.60 | 95.97 | 105.93 | 104.42 | 101.00 | a | 100.73 | 90.19 | 74.40 | 64.48 | 86.63 | |||||||||||
1969 | 67.19 | 67.82 | 73.71 | 87.47 | 97.03 | 101.47 | 107.32 | 108.16 | 100.40 | 85.94 | 74.80 | 67.45 | 86.56 | |||||||||||||
1970 | 66.26 | 74.64 | 74.61 | c | 82.07 | 97.42 | 104.90 | 108.81 | 104.94 | 96.77 | 85.06 | 77.13 | 65.81 | 86.53 | ||||||||||||
1971 | 67.97 | 72.61 | 81.71 | 85.27 | 91.68 | 103.33 | 109.39 | 102.42 | 100.43 | 82.55 | 75.13 | 62.65 | 86.26 | |||||||||||||
1972 | 67.42 | 76.79 | 89.23 | 88.33 | 95.87 | 102.77 | 109.84 | 104.65 | 99.83 | 82.39 | 69.63 | 63.68 | 87.54 | |||||||||||||
1973 | 62.87 | 67.82 | 67.29 | 83.13 | 96.13 | 103.50 | 107.16 | 106.84 | 101.83 | 92.19 | 74.57 | 70.39 | 86.14 | |||||||||||||
1974 | 66.19 | 72.32 | 78.55 | 87.20 | 97.10 | 109.38 | a | 104.87 | 105.84 | 99.10 | 87.23 | 75.30 | 63.77 | 87.24 | ||||||||||||
1975 | 67.00 | 69.43 | 73.71 | 78.53 | 93.10 | 103.53 | 106.03 | 108.10 | 100.90 | 90.00 | 78.20 | 68.77 | 86.44 | |||||||||||||
1976 | 69.94 | 74.21 | 76.74 | 83.87 | 96.10 | 106.03 | 106.23 | 106.26 | 96.00 | 85.39 | 78.23 | 70.13 | 87.43 | |||||||||||||
1977 | 65.06 | 77.29 | 75.23 | 88.50 | 89.97 | 107.10 | 107.19 | 105.87 | 99.00 | 91.23 | 78.67 | 70.23 | 87.94 | |||||||||||||
1978 | 64.48 | 67.93 | 77.32 | 84.77 | 95.29 | 108.73 | 108.58 | 104.77 | 99.07 | 91.00 | 71.80 | 61.84 | 86.30 | |||||||||||||
1979 | 58.29 | 69.39 | 73.42 | 87.07 | 92.10 | 104.67 | 108.77 | 103.13 | 104.24 | a | 92.16 | 73.90 | 70.32 | 86.46 | ||||||||||||
1980 | 65.84 | 70.93 | 73.39 | 85.40 | 89.68 | 106.07 | 108.48 | 104.65 | 100.90 | 89.81 | 78.60 | 74.29 | 87.34 | |||||||||||||
1981 | 70.19 | 73.79 | 75.87 | 90.77 | 94.39 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 81.00 | g | |||||
1982 | 65.55 | 71.96 | 73.72 | b | 84.40 | 91.81 | 99.82 | b | 103.52 | 103.19 | 98.07 | 87.10 | 72.62 | a | 65.23 | 84.75 | ||||||||||
1983 | 69.35 | 69.11 | 73.03 | 79.47 | 92.87 | 100.70 | 105.00 | 101.90 | 99.73 | 87.23 | 74.57 | 67.61 | 85.05 | |||||||||||||
1984 | 69.26 | 73.59 | 81.10 | 83.67 | 99.90 | 101.57 | 101.81 | 101.74 | 99.50 | 83.57 | a | 75.48 | a | 64.23 | 86.28 | |||||||||||
1985 | 64.97 | a | 70.36 | 75.71 | 89.47 | 95.65 | 105.77 | 105.83 | a | 104.87 | 94.30 | 87.13 | 73.03 | 69.23 | 86.36 | |||||||||||
1986 | 75.87 | 72.07 | a | 81.52 | 87.07 | 95.35 | 104.57 | 102.48 | 103.87 | 94.60 | 87.39 | 77.33 | 68.55 | 87.56 | ||||||||||||
1987 | 68.45 | 70.89 | a | 75.65 | 90.93 | 93.67 | a | 104.57 | 104.57 | a | 102.03 | 97.90 | 92.23 | 74.63 | 64.57 | a | 86.67 | |||||||||
1988 | 67.03 | a | 75.75 | a | 80.73 | a | 84.66 | a | 95.11 | c | 103.80 | 104.06 | 101.97 | 98.73 | 94.58 | 78.68 | b | 68.29 | 87.78 | |||||||
1989 | 67.52 | 74.39 | 83.48 | 93.17 | 95.90 | 102.87 | 106.13 | 101.90 | 100.67 | 89.68 | 80.53 | 70.48 | 88.89 | |||||||||||||
1990 | 68.52 | 70.39 | 78.48 | 86.97 | 91.79 | c | 104.53 | 102.45 | 100.00 | 97.83 | 91.19 | 79.57 | 65.74 | 86.46 | ||||||||||||
1991 | 67.90 | 79.32 | 70.74 | 83.73 | 91.61 | 98.52 | c | 103.70 | a | 102.45 | 98.33 | 91.30 | a | 75.50 | 67.88 | f | 87.56 | a | ||||||||
1992 | 67.60 | a | 72.71 | a | 74.71 | 88.47 | 93.37 | a | 101.17 | 103.03 | a | 99.90 | 99.73 | 90.45 | 73.63 | 63.10 | a | 85.66 | ||||||||
1993 | 66.87 | 67.68 | 77.97 | 86.00 | 95.55 | 100.70 | 102.45 | 101.43 | a | 98.87 | 87.93 | a | 72.57 | 68.00 | 85.50 | |||||||||||
1994 | 69.81 | 70.11 | 78.29 | 83.00 | 91.32 | 105.67 | 105.77 | a | 106.73 | a | 100.10 | a | 86.86 | c | 72.74 | c | 67.70 | a | 86.51 | |||||||
1995 | 66.26 | 77.96 | c | 79.97 | b | 82.21 | b | 88.31 | b | 100.72 | a | 105.97 | b | 106.23 | a | 101.33 | 93.03 | a | 82.30 | 71.83 | a | 88.01 | ||||
1996 | 72.30 | a | 75.69 | 79.45 | 88.38 | a | 95.83 | a | 104.23 | 106.07 | d | 104.59 | b | 95.53 | 88.03 | 80.71 | f | 73.12 | e | 89.38 | a | |||||
1997 | 68.10 | a | 73.37 | a | 84.77 | 84.04 | c | 98.30 | a | 99.46 | b | 104.66 | b | 102.82 | n | 100.45 | h | 88.48 | 79.71 | i | 66.60 | p | 87.65 | d | ||
1998 | 69.29 | g | 65.54 | b | 75.28 | b | 80.47 | 88.55 | 98.53 | 105.07 | a | 104.61 | c | 100.11 | c | 88.23 | a | 77.69 | a | 68.21 | c | 86.57 | a | |||
1999 | 72.40 | a | 76.22 | e | 81.00 | i | 84.19 | n | 91.86 | c | 100.07 | b | 100.83 | a | 103.07 | a | 99.39 | b | 94.83 | b | 84.78 | g | 70.68 | 89.93 | c | |
2000 | 74.12 | e | 74.43 | f | 76.93 | d | 89.61 | g | 99.04 | h | 102.17 | 105.29 | 102.45 | 101.93 | 91.50 | o | 69.03 | a | 71.97 | a | 87.99 | d | ||||
2001 | 67.57 | a | 71.19 | b | 81.65 | h | 85.46 | b | 99.13 | a | 103.79 | a | 103.41 | b | 103.97 | b | 104.34 | a | 92.21 | b | 80.62 | d | 65.32 | f | 91.17 | b |
2002 | 68.16 | 75.39 | 77.50 | a | 89.00 | 94.67 | a | 106.40 | 105.35 | 104.39 | 100.15 | c | 87.89 | d | 80.55 | j | 67.54 | c | 88.77 | a | ||||||
2003 | 76.70 | a | 68.89 | 76.39 | 84.00 | c | 94.94 | 102.43 | 106.19 | 103.79 | c | 100.61 | b | 93.81 | 73.93 | a | 70.00 | a | 87.64 | |||||||
2004 | 69.23 | a | 68.08 | c | 85.87 | 86.24 | a | 95.90 | b | 103.43 | b | 105.65 | 103.00 | 98.80 | 87.34 | b | 73.70 | c | 69.32 | 87.21 | ||||||
2005 | 69.43 | a | 70.21 | 75.07 | a | 85.57 | g | 94.43 | a | 101.50 | 107.23 | 102.10 | b | 102.52 | e | 89.63 | d | 82.60 | e | 72.06 | 87.89 | a | ||||
2006 | 72.97 | 77.29 | 74.81 | 87.95 | j | 100.16 | 108.93 | 108.65 | 104.48 | 98.83 | 89.71 | 81.38 | a | 67.57 | c | 89.53 | a | |||||||||
2007 | 66.42 | e | 73.38 | d | 82.19 | 87.19 | c | 97.25 | c | 104.61 | b | 105.68 | 105.32 | c | 100.70 | 91.30 | a | 82.97 | a | 64.60 | a | 88.47 | ||||
2008 | 66.32 | 70.71 | a | 80.82 | c | 87.25 | b | 90.13 | a | 105.43 | 105.47 | a | 102.14 | b | 99.80 | 90.97 | a | 80.03 | a | 67.03 | b | 87.18 | ||||
2009 | 72.48 | b | 74.91 | f | 80.54 | c | 84.43 | b | 98.00 | b | 99.15 | c | 107.03 | b | 105.00 | 100.45 | a | 86.66 | b | 81.89 | k | 65.66 | b | 89.94 | b | |
2010 | 69.47 | a | 71.33 | a | 75.93 | b | 82.68 | b | 90.96 | c | 102.15 | d | 104.87 | a | 103.73 | e | 103.31 | d | 89.83 | a | 76.87 | 73.20 | f | 88.28 | a | |
2011 | 68.43 | a | 67.59 | f | 81.76 | b | 86.52 | e | 91.00 | a | 101.33 | c | 104.72 | b | 106.65 | 101.07 | a | 91.64 | c | 74.96 | d | 65.23 | a | 88.48 | a | |
2012 | 72.70 | a | 73.56 | b | 80.93 | c | 88.52 | c | 97.16 | f | 104.14 | b | 103.44 | d | 103.85 | d | 98.85 | c | 91.41 | b | 82.73 | d | 69.38 | g | 90.01 | b |
2013 | 66.79 | b | 70.04 | d | 83.26 | d | 87.42 | d | 94.96 | e | 104.93 | 104.00 | f | 104.38 | e | 98.31 | a | 86.90 | b | 78.41 | a | 69.07 | c | 85.86 | a | |
2014 | 73.47 | l | 77.52 | a | 81.70 | d | 87.88 | f | 94.41 | i | 103.88 | f | 104.11 | d | 100.53 | a | 99.04 | d | 91.50 | a | 78.82 | b | 69.85 | e | 87.88 | d |
2015 | 71.72 | b | 79.41 | a | 85.63 | a | 87.79 | f | 91.08 | f | 104.04 | f | 102.74 | d | 105.57 | c | 99.50 | d | 90.03 | a | 74.69 | a | 66.12 | f | 88.66 | d |
2016 | 68.57 | c | 82.96 | e | 84.12 | f | 86.48 | e | 91.25 | g | 106.23 | d | 106.68 | f | 102.63 | d | 97.91 | h | 94.36 | c | 79.55 | a | 71.67 | d | 86.56 | d |
2017 | 66.03 | b | 74.48 | c | 85.38 | b | 88.80 | e | 94.95 | i | 106.19 | d | 104.67 | d | 104.07 | a | 98.68 | b | 94.85 | d | 84.47 | 74.30 | d | 89.26 | a | |
2018 | 77.35 | e | 74.22 | e | 80.80 | f | 92.52 | i | 96.69 | e | 104.71 | m | 105.95 | j | 104.21 | g | 103.46 | d | 85.42 | e | 77.96 | c | 69.70 | h | 85.85 | f |
2019 | 69.45 | b | 67.48 | c | 79.20 | f | 90.80 | j | 88.17 | h | 102.52 | g | 106.82 | n | 106.38 | e | 99.57 | b | 90.92 | f | 80.36 | e | 67.76 | b | 81.83 | f |
2020 | 70.79 | c | 73.17 | 76.79 | b | 87.57 | b | 99.19 | e | 104.14 | b | 108.52 | d | 109.25 | c | 103.46 | d | 95.46 | c | 82.48 | c | 69.86 | c | 90.06 | ||
2021 | 70.93 | d | 75.09 | e | 79.87 | h | 91.08 | d | 96.30 | d | 108.07 | b | 104.52 | b | 104.58 | 101.64 | e | 90.00 | f | 83.48 | g | 72.89 | d | 91.68 | c | |
2022 | 72.10 | 75.62 | d | 82.12 | g | 90.71 | i | 97.86 | c | 106.07 | a | 107.15 | e | 104.14 | c | 102.88 | e | 90.28 | f | 74.59 | c | 67.37 | d | 89.75 | c | |
2023 | 66.52 | h | 71.12 | d | 74.62 | e | 89.58 | f | 96.62 | e | 101.68 | e | 113.10 | b | 109.64 | f | 102.76 | e | 94.25 | k | 82.71 | f | 73.00 | e | 90.41 | e |
2024 | 67.50 | c | 73.25 | a | 77.09 | h | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 70.38 | j |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 67.77 | 72.11 | 77.45 | 85.68 | 94.21 | 103.25 | 105.51 | 103.74 | 99.93 | 89.74 | 76.74 | 68.13 | 86.63 | |||||||||||||
S.D. | 3.94 | 3.83 | 4.30 | 3.20 | 3.03 | 2.65 | 2.21 | 2.19 | 2.15 | 3.24 | 3.68 | 3.28 | 1.17 | |||||||||||||
SKEW | -0.56 | 0.27 | 0.18 | 0.04 | -0.26 | 0.15 | 0.47 | 0.22 | -0.22 | -0.21 | 0.03 | 0.07 | 0.19 | |||||||||||||
MAX | 77.35 | 82.96 | 89.23 | 93.17 | 100.16 | 109.38 | 113.10 | 109.25 | 104.34 | 95.58 | 84.47 | 74.97 | 90.06 | |||||||||||||
MIN | 52.81 | 65.43 | 67.29 | 78.53 | 86.13 | 98.17 | 100.83 | 99.19 | 94.30 | 82.39 | 69.03 | 61.29 | 84.28 | |||||||||||||
YRS | 73 | 73 | 68 | 65 | 67 | 70 | 71 | 72 | 73 | 70 | 68 | 68 | 49 |