YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1939 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1940 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 103.43 | 106.29 | 103.19 | 96.67 | 87.16 | 72.50 | 67.19 | 90.92 | e | |||||||
1941 | 63.74 | 68.25 | 70.45 | 73.27 | 89.06 | 98.03 | 103.19 | 101.39 | 95.43 | b | 80.97 | 76.90 | 65.45 | 82.18 | ||||||||||||
1942 | 67.48 | 65.21 | 72.45 | 80.17 | 90.39 | 101.07 | 107.81 | 102.35 | 99.67 | 87.19 | 79.63 | 69.97 | a | 85.28 | ||||||||||||
1943 | 64.71 | 73.89 | 75.94 | 86.57 | 94.39 | 98.93 | 105.35 | 98.52 | 100.33 | 87.45 | 79.33 | 65.42 | 85.90 | |||||||||||||
1944 | 64.61 | 63.34 | 69.55 | 77.20 | 89.19 | 96.60 | 104.65 | 105.29 | 97.00 | 90.84 | 70.33 | 66.87 | 82.96 | |||||||||||||
1945 | 62.83 | a | 65.44 | a | 63.97 | 76.20 | 90.87 | 96.13 | 105.16 | 102.58 | 101.00 | 89.58 | 76.37 | 64.19 | 82.86 | |||||||||||
1946 | 62.81 | 68.04 | 74.39 | 87.30 | 87.39 | 100.13 | 101.27 | a | 101.13 | 96.60 | 80.45 | 69.41 | a | 70.32 | 83.27 | |||||||||||
1947 | 63.16 | 75.54 | 76.16 | 81.83 | 94.23 | 98.50 | 107.16 | 100.30 | k | 102.03 | 88.32 | 69.67 | 64.03 | 83.69 | a | |||||||||||
1948 | 68.68 | 65.10 | 67.26 | 84.87 | 93.39 | 100.87 | 105.68 | 104.77 | 101.37 | 88.81 | 72.07 | 64.45 | 84.78 | |||||||||||||
1949 | 51.68 | 63.71 | 72.35 | 84.90 | 90.97 | 99.40 | 103.29 | 104.29 | 100.00 | 83.94 | 83.57 | 65.87 | 83.66 | |||||||||||||
1950 | 64.29 | 72.39 | 75.74 | 88.40 | 91.00 | 100.90 | 101.10 | 104.23 | 96.90 | 96.45 | 81.93 | 76.13 | 87.46 | |||||||||||||
1951 | 66.13 | 66.52 | c | 73.16 | 79.53 | 90.00 | 98.97 | 106.97 | 100.84 | 99.97 | 87.97 | 70.83 | 62.48 | 83.61 | ||||||||||||
1952 | 61.81 | 66.59 | 64.39 | 79.00 | 93.77 | 100.90 | 104.94 | 104.29 | 101.50 | 96.68 | 70.17 | 62.97 | 83.92 | |||||||||||||
1953 | 69.48 | 69.04 | 74.35 | 81.00 | 85.71 | 101.33 | 104.65 | 104.26 | 103.33 | 90.45 | 78.70 | 65.90 | 85.68 | |||||||||||||
1954 | 67.39 | 78.14 | 71.35 | 88.13 | 93.42 | 99.70 | 104.35 | 100.00 | 100.00 | 91.10 | 81.87 | 69.32 | 87.06 | |||||||||||||
1955 | 60.10 | 66.25 | 75.32 | 81.77 | 89.58 | 98.90 | 100.68 | 97.87 | 100.37 | 93.43 | a | 75.83 | 71.43 | a | 84.29 | |||||||||||
1956 | 70.26 | 62.62 | 79.00 | 80.47 | 93.81 | 104.52 | a | 104.00 | 101.68 | 104.10 | 89.00 | 75.63 | 69.00 | 86.17 | ||||||||||||
1957 | 64.03 | 74.14 | 74.52 | 82.23 | 86.52 | 102.57 | 105.87 | 102.58 | 99.90 | 83.58 | 69.30 | 70.23 | 84.62 | |||||||||||||
1958 | 68.35 | 71.00 | 66.23 | 79.73 | 96.94 | 103.50 | 106.58 | 104.29 | 97.67 | 88.06 | 74.27 | 75.35 | 86.00 | |||||||||||||
1959 | 70.84 | 67.39 | 77.87 | 87.83 | 90.65 | 105.47 | 107.10 | 99.48 | 97.57 | 87.81 | 74.63 | 65.94 | 86.05 | |||||||||||||
1960 | 59.61 | 62.97 | 79.39 | 85.00 | 92.06 | 105.83 | 107.55 | 103.77 | 101.77 | 85.35 | 77.70 | 68.45 | 85.79 | |||||||||||||
1961 | 70.29 | 73.14 | 74.19 | 85.37 | 91.68 | 104.10 | 105.81 | 101.87 | 94.83 | 90.32 | 71.03 | 63.71 | 85.53 | |||||||||||||
1962 | 63.45 | 67.50 | 67.84 | 88.97 | 88.00 | c | 100.33 | 105.10 | 107.39 | 98.80 | 88.94 | 80.03 | 70.84 | 85.60 | ||||||||||||
1963 | 62.55 | 74.64 | 73.84 | 79.10 | 95.03 | 97.17 | 106.74 | 99.19 | 99.70 | 92.03 | 74.57 | 69.71 | 85.36 | |||||||||||||
1964 | 63.52 | 67.03 | 70.03 | 79.87 | 90.29 | 99.27 | 105.97 | 97.87 | 95.30 | 93.06 | 70.90 | 66.71 | 83.32 | |||||||||||||
1965 | 65.90 | 67.43 | 69.68 | 77.10 | 87.58 | 94.47 | 104.90 | 104.39 | 94.77 | 91.94 | 77.40 | 63.45 | 83.25 | |||||||||||||
1966 | 61.87 | 61.86 | 76.48 | 85.43 | 95.00 | 101.43 | 106.06 | 103.45 | 96.07 | 87.81 | 78.15 | d | 66.71 | 85.03 | ||||||||||||
1967 | 67.00 | 73.93 | 78.29 | 75.07 | a | 90.19 | 96.87 | 103.29 | 102.97 | 97.60 | 90.68 | 78.31 | a | 60.48 | 84.56 | |||||||||||
1968 | 66.65 | 74.29 | a | 73.94 | 80.43 | 91.06 | 104.60 | 102.28 | b | 98.32 | 99.03 | 88.45 | 73.43 | 63.26 | 84.64 | |||||||||||
1969 | 66.03 | 65.11 | 71.23 | 83.40 | 94.23 | a | 98.23 | 105.40 | a | 106.97 | 99.40 | 83.23 | 73.90 | 67.63 | a | 84.56 | ||||||||||
1970 | 65.13 | 72.43 | 70.23 | 77.50 | 93.45 | 101.41 | a | 106.52 | 104.52 | 94.07 | 82.74 | 75.69 | a | 64.71 | 84.03 | |||||||||||
1971 | 67.81 | 70.04 | 77.74 | 80.43 | 87.00 | 99.73 | 107.00 | a | 100.32 | 98.50 | 79.52 | 73.33 | 60.65 | 83.51 | ||||||||||||
1972 | 67.39 | 74.59 | 85.68 | 84.73 | 92.65 | 100.20 | 106.32 | 102.52 | 97.34 | a | 81.10 | 67.60 | 62.32 | 85.20 | ||||||||||||
1973 | 60.58 | 65.32 | 62.61 | 77.68 | b | 92.77 | 101.90 | 104.61 | 104.39 | 98.57 | 90.68 | 73.37 | 68.81 | 83.44 | ||||||||||||
1974 | 64.10 | 70.46 | 75.93 | a | 84.20 | 93.48 | 107.47 | 103.58 | 103.26 | 97.67 | 85.55 | 73.87 | 61.65 | 85.10 | ||||||||||||
1975 | 65.29 | 66.64 | 69.94 | 74.07 | 89.52 | 99.70 | 104.45 | 105.10 | 97.73 | 87.45 | 76.67 | 67.71 | 83.69 | |||||||||||||
1976 | 69.10 | 70.69 | 72.71 | 79.67 | 92.16 | 102.10 | 103.19 | 103.55 | 93.90 | 83.06 | 76.77 | ----- | z | 86.08 | a | |||||||||||
1977 | 63.47 | a | 74.82 | 71.26 | 85.03 | 86.74 | 103.87 | 105.48 | 103.45 | 96.97 | 89.10 | 78.13 | 70.42 | 85.73 | ||||||||||||
1978 | 64.13 | a | 65.75 | 74.77 | 79.23 | 91.16 | 104.30 | 106.74 | 102.52 | 97.37 | 90.68 | 71.03 | 61.10 | 84.07 | ||||||||||||
1979 | 56.68 | 67.39 | 69.94 | 82.80 | 88.65 | 102.23 | 106.06 | 101.42 | 102.67 | 90.87 | 71.67 | 70.06 | 84.20 | |||||||||||||
1980 | 64.35 | 68.46 | a | 68.55 | 81.33 | 86.35 | 103.77 | 107.84 | 102.42 | 99.73 | 88.19 | 78.43 | 75.13 | 85.38 | ||||||||||||
1981 | 69.77 | 74.79 | 74.84 | f | 86.80 | 89.94 | 104.90 | 104.45 | 104.81 | 98.23 | 82.74 | 78.20 | 69.45 | 87.64 | a | |||||||||||
1982 | 62.23 | 68.29 | 69.13 | 81.93 | 89.29 | 98.57 | 103.06 | 102.45 | 95.70 | 86.10 | 69.27 | 61.60 | a | 82.30 | ||||||||||||
1983 | ----- | z | 65.79 | 67.45 | 73.93 | 91.42 | 98.67 | 104.80 | a | 101.19 | 98.53 | 84.32 | 71.07 | 63.55 | 83.70 | a | ||||||||||
1984 | 67.50 | a | 71.54 | a | 78.10 | 79.31 | a | 98.52 | 99.40 | 101.87 | 100.32 | 97.28 | a | 79.61 | 72.87 | 60.77 | 83.92 | |||||||||
1985 | 62.32 | 66.86 | 71.71 | 86.57 | 93.13 | 104.73 | 106.26 | 104.52 | 91.50 | 84.74 | 70.97 | 67.71 | 84.25 | |||||||||||||
1986 | 73.94 | 69.86 | 77.42 | 83.77 | 93.10 | 103.23 | 101.35 | 103.48 | 92.03 | 83.87 | 74.80 | 65.52 | 85.20 | |||||||||||||
1987 | 64.94 | 67.32 | 71.55 | 88.47 | 91.42 | 103.73 | 103.81 | 101.94 | 97.60 | 91.33 | a | 72.00 | a | 61.71 | 84.65 | |||||||||||
1988 | 64.07 | a | 73.10 | 77.84 | 81.77 | 92.61 | 102.97 | 105.87 | 101.16 | 97.43 | 92.35 | 74.83 | 66.29 | 85.86 | ||||||||||||
1989 | 65.03 | 71.29 | 80.97 | 91.40 | 93.65 | 102.03 | 106.90 | 102.16 | 100.07 | 87.52 | 79.10 | 69.16 | 87.44 | |||||||||||||
1990 | 66.03 | 65.39 | 75.52 | 83.63 | 89.87 | 105.07 | 102.23 | 99.52 | 97.13 | 85.52 | 77.62 | f | 62.61 | 84.77 | a | |||||||||||
1991 | 64.39 | 76.71 | 65.81 | 81.03 | 89.97 | 97.30 | 104.68 | 103.87 | 97.33 | 91.48 | 73.27 | 64.03 | 84.16 | |||||||||||||
1992 | 63.77 | 70.28 | 71.58 | 85.83 | 91.74 | 99.93 | 102.03 | 100.63 | a | 99.13 | 90.90 | 72.47 | 61.77 | 84.17 | ||||||||||||
1993 | 64.03 | 64.50 | 74.77 | 84.10 | 94.84 | 101.60 | 103.19 | 101.87 | 98.70 | 86.77 | 71.07 | 67.68 | c | 84.43 | ||||||||||||
1994 | 70.30 | a | 67.21 | 76.61 | 84.10 | 90.57 | a | 105.87 | 105.63 | a | 107.00 | 99.86 | a | 85.40 | a | 69.80 | e | 68.69 | e | 85.92 | ||||||
1995 | 63.17 | a | 73.88 | b | 74.61 | 80.75 | b | 86.73 | a | 99.42 | f | 107.33 | a | 107.03 | 101.23 | d | 91.83 | b | 80.92 | e | 72.96 | g | 86.75 | b | ||
1996 | 70.80 | k | 74.52 | h | 78.19 | j | 89.09 | s | 96.60 | k | 106.42 | k | 105.06 | n | 106.71 | j | 94.63 | k | 89.00 | n | 80.09 | g | 70.82 | i | ----- | z |
1997 | 63.77 | i | 69.83 | d | 82.00 | g | 82.23 | h | 98.59 | n | 101.10 | j | 106.53 | l | 104.74 | l | 101.76 | i | 88.43 | j | 78.56 | n | 64.00 | p | 69.83 | k |
1998 | 68.62 | o | 62.00 | l | 73.68 | l | 76.50 | h | 89.41 | i | 96.96 | c | 107.15 | d | 106.68 | i | 99.85 | c | 88.35 | e | 76.00 | g | 67.65 | e | 91.99 | g |
1999 | 71.42 | e | 73.37 | i | 78.05 | j | 77.40 | e | 90.92 | g | 100.84 | e | 102.84 | l | 104.50 | i | 99.05 | j | 94.12 | o | 89.67 | u | 71.73 | t | 83.22 | i |
2000 | 73.62 | o | 75.87 | n | 75.41 | n | 91.93 | p | 98.12 | n | 105.00 | n | 108.40 | p | 105.07 | p | 104.29 | p | 84.53 | n | 67.83 | r | 70.50 | u | ----- | z |
2001 | 67.57 | q | 68.17 | p | 73.93 | q | 84.13 | o | 100.72 | m | 105.31 | n | 106.56 | m | 104.94 | m | 104.43 | p | 92.67 | s | 77.85 | q | 64.87 | p | ----- | z |
2002 | 68.21 | q | 75.31 | o | 80.07 | q | 90.00 | m | 94.24 | n | 106.13 | o | 107.53 | n | 104.93 | q | 103.19 | n | 88.13 | p | 79.54 | q | 68.60 | u | ----- | z |
2003 | 75.64 | q | 68.75 | l | 73.31 | o | 79.47 | o | 99.78 | v | 104.44 | n | 108.60 | p | 105.67 | p | 102.38 | n | 98.92 | r | 73.15 | q | 71.10 | u | ----- | z |
2004 | 67.50 | o | 67.31 | p | 85.93 | p | 86.43 | p | 95.67 | p | 102.71 | m | 107.00 | r | 105.13 | p | 98.62 | q | 87.27 | p | 69.87 | o | 65.73 | p | ----- | z |
2005 | 64.21 | l | 66.15 | h | 72.47 | l | ----- | z | 94.67 | p | 104.87 | o | 112.38 | w | 103.75 | o | 103.27 | s | 88.50 | q | 81.21 | p | 70.50 | s | ----- | z |
2006 | 73.87 | p | 76.14 | n | 75.38 | o | 86.75 | r | 99.69 | r | 107.64 | p | 108.33 | s | 103.42 | l | 97.43 | p | 88.47 | p | 81.36 | p | 70.43 | x | ----- | z |
2007 | 69.00 | q | 72.64 | n | 80.33 | p | 85.35 | m | 96.47 | p | 105.00 | o | 110.55 | t | 106.41 | n | 100.57 | p | 92.88 | n | 86.87 | o | 64.00 | u | ----- | z |
2008 | 63.07 | p | 68.21 | o | 80.53 | p | 87.21 | p | 90.80 | u | 106.85 | q | 106.20 | p | 105.64 | q | 102.15 | q | 94.29 | n | 83.82 | s | 70.36 | t | ----- | z |
2009 | 70.81 | o | 71.93 | n | 81.31 | o | 86.41 | m | 99.69 | r | 100.78 | l | 109.67 | p | ----- | z | 105.00 | r | 88.17 | s | 85.23 | q | 63.83 | s | ----- | z |
2010 | 67.21 | q | 70.17 | p | 73.47 | n | 84.27 | o | 89.69 | r | 103.88 | v | 108.71 | q | 106.75 | s | 103.90 | t | 88.53 | p | 77.19 | n | 77.30 | u | ----- | z |
2011 | 69.00 | q | 71.00 | q | 80.21 | q | 88.42 | r | 89.59 | n | 104.86 | p | ----- | z | ----- | z | ----- | z | 94.43 | q | 75.93 | o | 60.00 | x | ----- | z |
2012 | 68.22 | v | 70.36 | r | 76.83 | s | ----- | z | 99.67 | v | 106.12 | v | 106.20 | u | 106.50 | u | ----- | z | 96.12 | w | 81.86 | w | ----- | z | ----- | z |
2013 | 72.33 | y | 65.22 | s | 81.45 | t | 86.10 | t | 95.09 | t | 106.00 | s | 104.92 | r | 103.50 | y | ----- | z | 89.00 | v | 80.50 | t | 68.88 | w | ----- | z |
2014 | 71.50 | y | 76.00 | q | 79.58 | s | 88.10 | t | 92.90 | u | 105.27 | s | 106.56 | v | 98.20 | u | 96.71 | w | 91.00 | v | ----- | z | ----- | z | ----- | z |
2015 | 71.25 | w | 73.90 | r | 80.70 | u | 89.33 | r | ----- | z | 107.64 | s | 105.82 | t | ----- | z | 95.86 | w | 85.75 | w | 72.67 | x | ----- | z | ----- | z |
2016 | ----- | z | ----- | z | 80.60 | u | 85.27 | s | 90.80 | u | ----- | z | 109.62 | w | 105.00 | u | ----- | z | ----- | z | 83.50 | x | 71.00 | y | ----- | z |
2017 | 65.57 | x | 72.25 | t | 81.50 | s | ----- | z | 92.50 | s | 111.83 | x | 106.40 | p | 107.50 | m | 102.00 | o | 96.31 | o | 85.21 | p | 76.83 | s | ----- | z |
2018 | 77.06 | n | 73.08 | o | 78.85 | r | 94.20 | o | 95.83 | m | 107.62 | n | 109.67 | s | 105.11 | m | 103.86 | p | 85.31 | o | 77.14 | p | 71.00 | u | ----- | z |
2019 | 69.19 | o | 65.19 | l | 78.40 | p | 87.81 | n | 87.12 | n | 103.88 | n | 110.85 | r | 109.35 | n | 99.38 | n | 90.27 | p | 82.77 | q | 68.08 | s | ----- | z |
2020 | 69.69 | o | 69.81 | m | 73.80 | k | 87.44 | l | 99.93 | p | 106.81 | n | 111.14 | x | 113.82 | n | 104.38 | n | 96.59 | n | 83.80 | t | 75.80 | u | ----- | z |
2021 | 68.47 | p | 75.17 | p | 76.84 | l | 88.54 | q | 96.69 | o | 108.00 | l | 104.64 | t | 102.67 | m | 100.35 | m | 85.12 | w | ----- | z | ----- | z | ----- | z |
2022 | ----- | z | 72.50 | l | 83.60 | u | 90.88 | n | 96.87 | p | 107.17 | l | 109.57 | q | 106.12 | w | 102.40 | o | 91.88 | o | 75.71 | p | 64.22 | v | ----- | z |
2023 | 67.75 | s | 67.12 | l | 71.44 | m | 86.62 | q | 96.27 | p | 102.31 | n | ----- | z | 108.43 | q | 101.30 | t | 91.12 | w | 82.71 | w | 76.36 | t | ----- | z |
2024 | 65.30 | u | 72.62 | p | 75.80 | p | 82.58 | r | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 65.09 | 69.17 | 73.00 | 82.10 | 91.22 | 101.13 | 104.94 | 102.63 | 98.33 | 87.77 | 74.65 | 66.44 | 84.69 | |||||||||||||
S.D. | 3.75 | 4.02 | 4.56 | 4.15 | 2.78 | 2.87 | 1.87 | 2.30 | 2.58 | 3.94 | 3.84 | 3.78 | 1.22 | |||||||||||||
SKEW | -0.57 | 0.26 | -0.01 | -0.07 | 0.08 | -0.00 | -0.52 | -0.11 | -0.29 | -0.15 | 0.31 | 0.47 | 0.18 | |||||||||||||
MAX | 73.94 | 78.14 | 85.68 | 91.40 | 98.52 | 107.47 | 107.84 | 107.39 | 104.10 | 96.68 | 83.57 | 76.13 | 87.46 | |||||||||||||
MIN | 51.68 | 61.86 | 62.61 | 73.27 | 85.71 | 94.47 | 100.68 | 97.87 | 91.50 | 79.52 | 67.60 | 60.48 | 82.18 | |||||||||||||
YRS | 55 | 56 | 54 | 56 | 55 | 57 | 57 | 55 | 57 | 57 | 55 | 55 | 49 |