YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1935 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 103.40 | 103.97 | 100.57 | a | 95.43 | 80.79 | g | 64.77 | 56.52 | 87.44 | f | |||||
1936 | 58.39 | 60.31 | 72.10 | a | 86.70 | c | 94.37 | a | 102.93 | 104.23 | a | 101.29 | c | 92.52 | a | 81.26 | 66.10 | a | 55.60 | a | 81.32 | |||||
1937 | 41.81 | 57.50 | 68.06 | 80.39 | b | 94.33 | a | 99.97 | 104.97 | a | 105.23 | 97.97 | 83.55 | 71.20 | 58.90 | 80.32 | ||||||||||
1938 | 56.74 | 58.54 | 66.29 | 81.43 | 88.00 | 101.00 | 104.94 | 102.35 | 97.27 | 81.90 | 62.55 | a | 56.63 | a | 79.80 | |||||||||||
1939 | 54.77 | 52.07 | 71.68 | 83.63 | 92.77 | 102.47 | 107.87 | a | 105.90 | 91.86 | a | 82.13 | a | 69.21 | a | 59.66 | b | 81.17 | ||||||||
1940 | 56.23 | a | 61.85 | c | 75.75 | c | 80.93 | c | 94.20 | a | 104.25 | b | 107.80 | a | 104.69 | b | 90.52 | a | 82.34 | b | 64.46 | b | 54.21 | b | 81.44 | |
1941 | 56.79 | b | 64.18 | 71.10 | a | 72.97 | 89.32 | 96.50 | b | 105.03 | 100.30 | a | 94.82 | b | 77.03 | a | 73.57 | p | 56.21 | b | 80.39 | a | ||||
1942 | 57.10 | 57.39 | 66.90 | 80.03 | a | 89.41 | b | 102.17 | a | 107.57 | a | 102.75 | c | 98.04 | b | 82.54 | c | 76.16 | k | 61.38 | b | 82.30 | a | |||
1943 | 59.10 | 66.14 | 72.87 | 86.17 | 93.55 | 98.63 | 106.23 | 100.00 | 98.10 | 85.48 | 71.70 | 56.65 | 82.88 | |||||||||||||
1944 | 55.71 | 59.55 | 68.71 | 75.97 | a | 88.63 | a | 98.86 | a | 105.10 | 106.32 | 99.07 | 87.29 | 66.53 | 58.45 | 80.85 | ||||||||||
1945 | 58.94 | 65.82 | 66.39 | 78.70 | 90.77 | 98.33 | 103.94 | 98.71 | 97.38 | a | 83.59 | d | ----- | z | 51.81 | 81.31 | a | |||||||||
1946 | 54.48 | 62.68 | 73.13 | 83.79 | a | 89.69 | b | 104.28 | a | 103.48 | 100.07 | b | ----- | z | 78.03 | 62.53 | 58.26 | 79.13 | a | |||||||
1947 | 55.77 | 67.22 | a | 76.83 | a | 82.17 | 95.20 | a | 100.00 | a | 106.35 | 99.77 | 100.37 | 84.10 | a | 62.93 | 54.07 | a | 82.07 | |||||||
1948 | 56.97 | 59.24 | 64.65 | 82.87 | 93.65 | 100.17 | a | 106.19 | 101.81 | 99.90 | 83.26 | 66.70 | 59.32 | 81.23 | ||||||||||||
1949 | 46.74 | 56.81 | b | 70.28 | b | 83.93 | 88.35 | 97.23 | 105.77 | a | 104.26 | 97.33 | c | 79.52 | 71.57 | 55.48 | 79.77 | |||||||||
1950 | 55.84 | 65.18 | 73.65 | 84.80 | 91.82 | c | 101.57 | 103.03 | 102.87 | 96.03 | 92.19 | 73.80 | 65.52 | 83.86 | ||||||||||||
1951 | 58.81 | 62.96 | 71.16 | 81.10 | 90.07 | a | 99.05 | h | 108.97 | 101.61 | 100.37 | 82.94 | 63.87 | 54.19 | 79.64 | a | ||||||||||
1952 | 53.81 | 61.38 | 63.90 | 79.97 | 92.45 | 100.57 | 105.03 | 103.16 | 97.67 | f | 90.55 | 63.13 | 54.81 | 78.98 | a | |||||||||||
1953 | 61.81 | 63.36 | 73.29 | 80.60 | 84.32 | 102.40 | 105.00 | 101.68 | 98.97 | 83.61 | 68.80 | 53.84 | 81.47 | |||||||||||||
1954 | 55.20 | f | 68.93 | 67.77 | 87.40 | 94.55 | 100.60 | 106.69 | b | 102.61 | 97.40 | e | 86.03 | 71.96 | b | 54.93 | d | 85.35 | a | |||||||
1955 | 51.66 | b | 55.85 | b | 71.55 | 80.50 | b | 88.81 | d | 98.00 | 105.29 | 103.45 | b | 100.21 | b | 89.68 | 68.61 | b | 62.11 | d | 81.31 | |||||
1956 | 60.77 | a | 61.54 | a | 75.43 | a | 80.17 | a | 93.53 | a | 104.97 | 105.54 | g | 103.39 | c | 103.05 | j | 84.89 | d | 64.07 | a | 56.21 | l | 80.97 | c | |
1957 | 54.83 | a | 66.36 | 71.42 | 78.20 | 82.93 | b | 102.23 | 104.31 | b | 97.74 | d | 98.00 | 77.97 | a | 61.14 | b | 56.64 | c | 79.31 | ||||||
1958 | 56.50 | c | 65.42 | d | 63.57 | h | 78.19 | i | 95.36 | c | 102.66 | a | 109.08 | f | 105.04 | c | 94.54 | d | 85.86 | j | ----- | z | ----- | z | 86.58 | f |
1959 | ----- | z | 60.33 | d | ----- | z | 86.56 | u | 89.96 | c | 103.26 | c | 108.84 | 99.78 | d | 94.54 | f | 84.96 | e | ----- | z | 58.19 | j | 91.19 | f | |
1960 | 50.20 | a | 58.83 | f | 76.07 | c | 84.62 | i | 93.46 | e | 106.67 | i | 108.13 | p | 103.38 | r | 94.09 | h | 90.11 | v | ----- | z | 55.90 | a | 68.91 | h |
1961 | 58.61 | 68.36 | 72.94 | 82.53 | 92.52 | 106.67 | 107.83 | a | 101.48 | 93.43 | 84.65 | 67.53 | 51.52 | 82.34 | ||||||||||||
1962 | 57.26 | 60.93 | a | 69.06 | 90.23 | ----- | z | ----- | z | 107.35 | 106.39 | 98.73 | 86.52 | 72.47 | 61.38 | b | 81.03 | b | ||||||||
1963 | 55.81 | 72.64 | 66.63 | l | 79.00 | m | 96.81 | 99.70 | 108.61 | 98.23 | 97.73 | 85.03 | 66.03 | 54.48 | 83.51 | b | ||||||||||
1964 | 54.52 | 58.41 | ----- | z | 84.72 | a | ----- | z | 100.70 | ----- | z | 104.90 | ----- | z | ----- | z | ----- | z | ----- | z | 80.65 | g | ||||
1965 | ----- | z | ----- | z | 68.74 | 77.50 | 88.87 | 96.34 | a | 104.13 | a | 105.06 | 93.73 | 91.23 | ----- | z | ----- | z | 90.70 | d | ||||||
1966 | ----- | z | 59.36 | 77.23 | 88.40 | 97.39 | 103.87 | 106.43 | a | 106.97 | 100.30 | 86.16 | 73.43 | 60.74 | 87.30 | a | ||||||||||
1967 | 58.68 | 69.96 | 78.03 | 79.17 | 92.03 | 97.87 | 107.03 | 106.16 | 96.73 | 89.55 | 75.90 | 52.68 | 83.65 | |||||||||||||
1968 | 53.26 | ----- | z | 76.87 | 82.17 | 92.84 | 110.55 | j | 105.19 | 98.61 | 99.07 | a | 86.03 | 71.34 | a | 53.59 | i | 85.04 | c | |||||||
1969 | 59.71 | 60.52 | a | 68.97 | 88.59 | a | 95.74 | 100.55 | a | ----- | z | 101.50 | w | 95.70 | ----- | z | ----- | z | ----- | z | 81.40 | e | ||||
1970 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 75.00 | s | 70.42 | d | ----- | z | 70.42 | k |
1971 | 45.33 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 45.33 | k |
1972 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 107.42 | 102.52 | 94.67 | 74.81 | 60.93 | 52.35 | 82.12 | f | ||||||
1973 | 48.65 | 57.79 | 61.37 | a | 74.72 | a | 92.97 | 99.88 | f | 106.16 | 102.87 | 96.63 | ----- | z | 67.80 | 59.97 | 76.89 | b | ||||||||
1974 | 51.47 | a | 61.46 | 75.13 | a | 80.29 | w | 93.84 | 107.17 | 106.13 | a | 105.33 | a | 96.07 | 82.87 | 65.10 | 54.74 | 81.76 | a | |||||||
1975 | 53.59 | b | 59.82 | 65.41 | b | 73.50 | 87.45 | 100.93 | 106.33 | a | 106.10 | 94.57 | 84.32 | 67.87 | 56.42 | 79.69 | ||||||||||
1976 | 57.71 | 65.48 | 68.81 | 79.90 | 93.33 | a | 101.65 | d | 104.74 | 103.00 | 91.57 | 81.35 | 69.38 | a | 58.00 | 81.24 | ||||||||||
1977 | 53.06 | 66.93 | 69.53 | a | 84.73 | 86.67 | a | 104.93 | b | 105.30 | a | 105.00 | c | 98.30 | 86.81 | 71.03 | a | 63.14 | b | 82.95 | ||||||
1978 | 56.13 | 60.39 | 73.00 | 79.43 | 89.15 | e | 104.67 | 108.13 | 103.74 | 94.97 | a | 87.45 | 65.81 | c | 49.00 | 80.99 | ||||||||||
1979 | 49.10 | 59.32 | ----- | z | 83.96 | e | 88.39 | 102.21 | a | 108.35 | 101.87 | a | 101.60 | 87.53 | a | ----- | z | 56.23 | 83.86 | b | ||||||
1980 | 58.32 | 64.62 | 67.97 | a | 81.10 | a | 87.77 | 104.63 | ----- | z | 105.61 | 99.03 | 84.45 | 70.87 | 63.10 | 80.68 | a | |||||||||
1981 | 62.74 | 67.86 | 70.71 | 87.57 | 91.90 | 107.30 | 107.71 | 103.16 | 94.47 | 77.97 | 70.67 | 59.58 | 83.47 | |||||||||||||
1982 | 54.55 | 60.25 | 68.50 | a | 79.27 | 88.17 | a | 99.69 | a | 102.35 | 97.94 | 92.60 | 77.61 | c | 63.00 | 54.43 | a | 78.20 | ||||||||
1983 | 56.63 | a | 62.39 | 67.10 | a | 73.90 | 89.53 | a | 100.00 | b | 102.77 | 98.48 | 97.62 | a | 82.19 | 67.27 | 59.42 | 79.78 | ||||||||
1984 | 57.06 | 63.48 | 73.93 | a | 79.93 | 98.26 | 100.40 | 102.27 | a | 99.53 | a | 97.21 | a | 76.61 | 67.90 | 56.13 | a | 81.06 | ||||||||
1985 | 54.16 | 60.04 | 69.07 | a | 84.63 | 92.87 | a | 105.57 | 106.77 | 105.68 | 90.60 | 82.94 | 65.52 | a | 56.42 | 81.19 | ||||||||||
1986 | 64.00 | 66.68 | 77.39 | 81.10 | 93.06 | 103.46 | b | 103.90 | 105.14 | b | 91.40 | 77.34 | b | 66.00 | a | 56.10 | 82.13 | |||||||||
1987 | 54.03 | a | 62.12 | c | 69.75 | c | 85.84 | e | 90.30 | a | 104.66 | a | 105.69 | b | 102.30 | a | 97.38 | a | 84.45 | 64.24 | a | 52.97 | 81.14 | |||
1988 | 55.17 | a | 67.04 | b | 75.46 | c | 82.19 | c | 92.48 | b | 101.11 | b | 108.23 | 101.52 | 94.07 | 87.23 | 68.40 | 57.26 | 82.51 | |||||||
1989 | 54.13 | 62.56 | a | 81.33 | a | 92.45 | a | 94.61 | 103.70 | 108.30 | a | 101.61 | 95.53 | 82.07 | a | 70.47 | 59.20 | a | 83.83 | |||||||
1990 | 58.06 | 63.25 | 75.55 | 83.62 | a | 91.32 | 106.53 | 106.10 | 100.84 | 93.90 | a | 83.27 | a | 67.23 | 50.39 | 81.67 | ||||||||||
1991 | 54.27 | a | 68.96 | 66.81 | 81.17 | 90.37 | a | 100.52 | c | 108.03 | 105.03 | a | 96.30 | 86.67 | a | 66.34 | a | 54.32 | 81.57 | |||||||
1992 | 54.65 | 66.00 | 71.42 | 89.17 | 92.24 | b | 101.43 | 104.68 | 104.13 | a | 97.38 | a | 86.13 | 64.07 | 49.71 | 81.75 | ||||||||||
1993 | 56.42 | 60.79 | 73.66 | b | 84.33 | 93.97 | 102.53 | 106.80 | a | 101.81 | ----- | z | 80.73 | a | 64.44 | c | 56.32 | 80.16 | a | |||||||
1994 | 58.23 | a | 61.50 | 76.97 | a | 82.10 | 91.20 | a | 107.18 | b | 106.81 | 103.35 | 95.00 | 79.87 | 62.63 | 56.60 | a | 81.79 | ||||||||
1995 | 56.17 | a | 70.22 | a | 72.26 | 80.24 | a | 86.93 | a | 99.04 | b | 106.83 | a | 104.13 | 95.40 | 84.70 | d | 72.11 | c | 60.33 | a | 82.36 | ||||
1996 | 61.94 | 68.56 | b | 77.00 | d | 86.40 | 97.42 | 106.90 | a | 106.67 | a | 104.00 | a | 92.30 | 80.64 | c | 67.31 | a | 59.13 | 84.02 | ||||||
1997 | 57.03 | 64.81 | b | 80.90 | a | 78.07 | a | 96.03 | 100.43 | 105.61 | 100.06 | 92.43 | 80.56 | d | ----- | z | 54.00 | a | 82.72 | a | ||||||
1998 | 59.87 | 59.00 | b | 72.36 | c | 76.11 | c | 89.07 | a | 98.67 | c | 106.62 | e | 103.54 | c | 93.42 | d | 81.41 | d | 67.48 | a | 58.59 | d | 80.51 | ||
1999 | 62.86 | c | 68.16 | c | 79.41 | b | 76.74 | g | 89.88 | e | 101.88 | d | 99.96 | e | 98.38 | b | 93.24 | e | 87.90 | a | 74.67 | 59.68 | 83.28 | a | ||
2000 | 61.97 | 67.33 | b | 72.24 | f | 88.63 | c | 98.00 | c | 102.78 | c | 105.93 | c | 100.19 | d | 97.37 | c | 80.28 | b | 60.25 | b | 60.26 | d | 83.91 | a | |
2001 | 56.07 | a | 63.95 | f | 73.28 | b | 81.00 | d | 96.84 | f | 106.08 | f | 103.43 | c | 101.89 | c | 99.76 | a | 88.53 | l | 70.57 | 54.93 | d | 80.11 | d | |
2002 | 57.46 | e | 66.54 | b | 71.11 | d | 87.81 | d | 93.45 | b | 105.61 | b | 108.48 | h | 105.61 | c | 93.85 | c | 80.12 | e | 68.38 | d | 56.43 | c | 80.58 | a |
2003 | 63.47 | a | 61.43 | g | 72.12 | e | 79.12 | f | 93.93 | b | 103.33 | 109.81 | d | 102.68 | f | 98.54 | b | 88.00 | f | 66.65 | d | 59.00 | d | 83.36 | d | |
2004 | 57.26 | 57.52 | b | 80.77 | a | 80.00 | c | 93.79 | c | 102.11 | c | 104.69 | b | 100.21 | b | 94.00 | b | 77.97 | a | 63.30 | c | 55.76 | b | 80.61 | ||
2005 | 58.59 | b | 61.57 | 69.00 | e | 79.64 | e | 93.73 | e | 98.55 | a | 107.36 | c | 97.81 | d | 95.19 | c | 82.61 | c | 71.10 | a | 60.26 | d | 81.28 | ||
2006 | 61.50 | c | 68.14 | f | 67.04 | d | 83.64 | b | 97.04 | e | 106.00 | c | 104.38 | b | 99.21 | g | 91.47 | 79.15 | e | 70.39 | b | 55.96 | g | 84.51 | c | |
2007 | 56.14 | c | 66.08 | c | 76.97 | a | 83.67 | c | 94.50 | e | 105.14 | b | 106.84 | 103.55 | b | 96.93 | a | 84.14 | b | 73.80 | 54.97 | 83.56 | ||||
2008 | 54.00 | b | 62.73 | c | 73.73 | a | 81.90 | a | 88.88 | f | 104.44 | c | ----- | z | ----- | z | ----- | z | 84.12 | o | 73.47 | k | 55.80 | k | 75.36 | g |
2009 | 59.97 | a | 64.07 | a | 74.07 | b | 79.74 | c | 95.73 | a | 95.46 | b | 106.93 | b | 104.47 | a | 97.22 | c | 81.15 | d | 72.04 | c | 52.62 | b | 81.96 | |
2010 | 55.00 | d | 59.54 | d | 70.30 | h | 78.60 | e | 88.06 | 103.03 | 106.64 | f | 100.45 | 101.34 | a | 78.06 | 65.20 | 59.00 | a | 78.83 | b | |||||
2011 | 57.62 | b | 60.33 | a | 72.77 | 80.20 | 86.10 | j | 101.20 | 102.61 | 105.23 | 94.50 | 82.55 | 66.31 | a | 53.32 | 79.70 | a | ||||||||
2012 | 60.26 | 63.03 | 74.65 | 83.23 | 95.48 | 106.17 | 100.68 | 99.48 | 94.53 | 85.32 | 71.40 | 57.17 | a | 82.62 | ||||||||||||
2013 | 53.61 | 60.07 | 76.42 | 82.87 | 91.26 | 105.73 | 102.90 | 97.27 | a | 90.14 | a | 78.23 | 66.93 | 54.77 | 80.02 | |||||||||||
2014 | 62.19 | 69.11 | 75.32 | 81.87 | 90.87 | 103.87 | 104.90 | 97.68 | 96.83 | 86.13 | 72.24 | a | 58.10 | 83.26 | ||||||||||||
2015 | 57.42 | 70.11 | 77.23 | 81.50 | 83.94 | 103.83 | 101.61 | 100.10 | 96.40 | 81.71 | 65.70 | 56.65 | 81.35 | |||||||||||||
2016 | 55.77 | 68.97 | 76.94 | 80.48 | a | 87.39 | 106.83 | 107.19 | 98.29 | 92.50 | 85.65 | 70.33 | 57.84 | 82.35 | ||||||||||||
2017 | 55.61 | 64.89 | 77.23 | 81.63 | 90.29 | 106.47 | 105.00 | a | 102.06 | 93.90 | 87.39 | c | 75.54 | d | 62.16 | 83.51 | ||||||||||
2018 | 63.13 | 64.82 | 73.26 | 87.41 | a | 92.94 | 105.03 | 104.81 | 102.70 | a | 98.23 | 75.32 | 67.27 | 56.68 | 82.63 | |||||||||||
2019 | 54.71 | 56.29 | 70.68 | 82.82 | b | 81.68 | 99.13 | ----- | z | 104.65 | e | 95.73 | 82.45 | b | 68.63 | 54.61 | 77.40 | a | ||||||||
2020 | 60.03 | 65.14 | a | 70.71 | 83.91 | g | 95.94 | 103.61 | b | 108.06 | 109.13 | 101.23 | 91.79 | b | 72.93 | 58.37 | a | 85.18 | a | |||||||
2021 | 57.77 | 65.58 | b | 69.31 | e | 86.03 | a | 94.19 | 106.90 | 104.97 | 104.53 | a | 99.13 | 80.23 | 74.20 | 59.45 | 83.52 | |||||||||
2022 | 59.43 | c | 64.21 | 73.16 | 86.20 | 94.56 | d | 104.33 | c | 106.10 | a | 102.13 | 99.22 | c | 83.23 | 64.87 | 57.94 | 82.95 | ||||||||
2023 | 55.38 | b | 59.89 | a | 64.65 | 81.90 | a | 91.10 | 98.30 | 111.27 | a | 100.97 | a | 96.10 | 86.10 | a | 71.07 | 62.14 | c | 81.57 | ||||||
2024 | 59.13 | 65.32 | a | 71.57 | c | 80.45 | j | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 65.34 | i | |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 56.51 | 63.17 | 72.20 | 82.23 | 91.78 | 102.34 | 105.78 | 102.42 | 96.12 | 83.25 | 68.03 | 56.89 | 81.72 | |||||||||||||
S.D. | 3.93 | 4.03 | 4.21 | 3.87 | 3.47 | 2.93 | 2.08 | 2.64 | 2.80 | 3.85 | 3.75 | 3.24 | 1.33 | |||||||||||||
SKEW | -0.89 | -0.04 | -0.08 | 0.06 | -0.53 | -0.18 | -0.29 | -0.06 | -0.14 | 0.07 | 0.05 | 0.04 | -0.23 | |||||||||||||
MAX | 64.00 | 72.64 | 81.33 | 92.45 | 98.26 | 107.30 | 111.27 | 109.13 | 101.60 | 92.19 | 75.90 | 65.52 | 84.02 | |||||||||||||
MIN | 41.81 | 52.07 | 61.37 | 72.97 | 81.68 | 95.46 | 99.96 | 97.27 | 90.14 | 74.81 | 60.25 | 49.00 | 78.20 | |||||||||||||
YRS | 83 | 80 | 79 | 77 | 80 | 80 | 77 | 82 | 79 | 78 | 76 | 78 | 50 |