YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1935 | ----- | z | ----- | z | ----- | z | ----- | z | 87.48 | d | 101.93 | 102.23 | 100.94 | 96.73 | 81.94 | 67.80 | 63.16 | 87.78 | d | |||||||
1936 | 63.26 | 65.41 | 76.45 | 84.87 | 92.68 | 101.30 | 103.52 | 102.19 | 94.97 | 82.90 | 70.67 | 60.32 | 83.21 | |||||||||||||
1937 | 47.97 | 62.75 | 71.07 | a | 79.00 | 91.77 | 98.97 | 104.23 | 105.10 | 99.47 | 87.94 | 74.87 | 65.77 | 82.41 | ||||||||||||
1938 | 66.19 | 63.79 | 67.94 | 81.27 | 89.71 | 98.87 | 103.68 | 102.16 | 98.33 | 82.29 | 67.97 | 64.00 | 82.18 | |||||||||||||
1939 | 60.87 | 59.86 | 73.84 | 84.90 | 92.42 | 99.80 | 105.84 | 105.23 | 87.67 | 82.29 | 72.07 | 68.19 | 82.75 | |||||||||||||
1940 | 63.97 | 64.34 | 72.39 | 77.53 | 85.47 | a | 99.10 | a | 103.81 | 104.94 | 93.50 | 83.03 | 64.90 | 57.84 | 80.90 | |||||||||||
1941 | 59.84 | 67.54 | 71.10 | 74.13 | 91.87 | 97.47 | 106.55 | 99.55 | 92.57 | 78.81 | 72.90 | 62.61 | 81.24 | |||||||||||||
1942 | 64.23 | 64.14 | 73.74 | 79.67 | 87.13 | 98.77 | 107.23 | 104.06 | 97.37 | 86.61 | 78.80 | 67.42 | 84.10 | |||||||||||||
1943 | 63.03 | a | 68.36 | 74.77 | 83.07 | a | 91.23 | 94.63 | 104.16 | 100.58 | 98.57 | 83.42 | 71.57 | 58.90 | 82.69 | |||||||||||
1944 | 59.74 | 59.48 | 69.27 | a | 75.73 | 86.77 | 91.40 | 102.42 | 104.39 | 96.63 | 85.16 | 65.53 | 66.17 | g | 81.50 | a | ||||||||||
1945 | 62.19 | d | 64.64 | 66.16 | 82.25 | b | 88.13 | 95.93 | 105.26 | 99.10 | 96.27 | 82.83 | a | 70.40 | 61.65 | 81.23 | ||||||||||
1946 | 62.68 | 66.25 | 71.58 | 85.63 | 90.29 | 101.20 | 101.81 | 103.03 | 97.83 | 79.45 | 66.31 | a | 64.84 | 82.58 | ||||||||||||
1947 | 63.39 | 73.18 | 76.29 | 82.20 | 94.40 | a | 96.47 | 105.71 | 99.80 | a | 100.17 | 84.68 | 66.47 | 60.48 | 83.60 | |||||||||||
1948 | 66.39 | 65.07 | b | 67.77 | 81.60 | 82.38 | o | ----- | z | 104.16 | 104.23 | 99.03 | 84.55 | 69.10 | 59.13 | 80.10 | b | |||||||||
1949 | 45.23 | 60.50 | 70.58 | 83.67 | 88.10 | 99.70 | 104.79 | b | 102.97 | 100.60 | 83.55 | 80.17 | 62.48 | 81.86 | ||||||||||||
1950 | 59.73 | a | 68.89 | 76.03 | 86.52 | a | 88.97 | 98.30 | 103.35 | 104.26 | 94.60 | 90.74 | 78.20 | 71.94 | 85.13 | |||||||||||
1951 | 64.38 | g | 65.89 | 74.71 | 80.83 | 89.19 | 97.60 | 105.13 | 102.16 | 100.37 | 83.58 | g | 69.97 | 58.74 | 84.46 | b | ||||||||||
1952 | 57.55 | 65.79 | 66.19 | 79.57 | 93.97 | 95.27 | 102.87 | 105.20 | a | 97.47 | 94.32 | 67.30 | 60.93 | a | 82.20 | |||||||||||
1953 | 68.39 | 67.11 | 75.10 | 81.93 | 83.74 | 98.83 | 106.48 | 103.32 | 100.83 | 85.94 | 74.77 | 65.87 | 84.36 | |||||||||||||
1954 | 62.65 | 76.96 | 70.37 | a | 89.00 | a | 94.48 | d | 98.70 | 105.73 | a | 101.76 | j | 99.79 | a | 89.94 | 77.70 | 64.73 | a | 84.55 | a | |||||
1955 | 58.50 | a | 64.39 | 76.10 | 79.52 | a | 88.10 | 99.69 | a | 102.42 | 101.10 | b | 99.54 | b | 90.13 | 74.17 | 67.77 | 83.45 | ||||||||
1956 | 68.65 | 66.39 | a | 79.07 | a | 81.45 | a | 91.13 | 102.07 | 103.87 | 103.33 | a | 102.07 | b | 83.68 | 74.83 | 64.39 | h | 86.96 | a | ||||||
1957 | 58.23 | 73.32 | 75.29 | 81.41 | a | 86.55 | 102.37 | 104.52 | 102.26 | 98.47 | 79.61 | 69.33 | 66.68 | 83.17 | ||||||||||||
1958 | 65.29 | 69.29 | 66.70 | a | 80.47 | 94.42 | 99.97 | 104.77 | 105.32 | 98.40 | 88.45 | 72.33 | 69.48 | 84.57 | ||||||||||||
1959 | 67.94 | 64.56 | a | 78.06 | 86.76 | a | 88.73 | a | 102.62 | a | 108.27 | a | 101.48 | 94.31 | a | 86.52 | b | 72.77 | 61.71 | 84.48 | ||||||
1960 | 56.87 | 63.69 | 78.42 | 83.67 | 91.68 | 104.37 | 106.48 | b | 104.87 | a | 97.93 | a | 83.39 | 68.79 | a | 61.87 | 83.50 | |||||||||
1961 | 65.90 | 69.18 | 74.94 | 84.13 | 89.40 | a | 103.90 | 106.83 | a | 101.45 | b | 93.59 | a | 83.45 | 67.27 | 60.10 | 83.34 | |||||||||
1962 | 63.77 | 66.29 | 67.20 | a | 88.76 | a | 87.57 | a | 99.23 | 104.32 | 106.28 | b | 98.77 | 86.17 | b | 75.00 | 65.16 | 84.04 | ||||||||
1963 | 59.58 | 74.75 | 72.19 | 76.63 | 91.61 | 94.67 | 105.13 | 101.58 | 97.17 | 85.74 | 70.10 | 64.87 | 82.84 | |||||||||||||
1964 | 59.84 | 66.17 | 70.35 | 78.54 | b | 87.84 | 96.97 | 105.57 | a | 102.80 | a | 96.00 | 90.00 | 65.57 | 63.84 | 81.96 | ||||||||||
1965 | 64.84 | 69.07 | a | 69.81 | 76.73 | 87.50 | a | 94.00 | b | 103.58 | 102.53 | a | 92.59 | a | 91.00 | 70.18 | b | 58.87 | a | 81.72 | ||||||
1966 | 58.90 | a | 62.11 | a | 74.90 | 86.67 | 93.00 | 99.63 | 104.57 | a | ----- | z | 97.28 | a | 85.29 | c | 72.57 | 63.10 | 81.64 | a | ||||||
1967 | 65.45 | 72.07 | 77.03 | 72.43 | 89.81 | 96.00 | 105.97 | 104.26 | 93.13 | 89.42 | 75.57 | 57.42 | 83.21 | |||||||||||||
1968 | 63.32 | ----- | z | 74.26 | 79.57 | 88.22 | h | 101.03 | a | 101.94 | 98.23 | 97.07 | ----- | z | 72.30 | 58.77 | 82.94 | c | ||||||||
1969 | 67.47 | a | 64.11 | 72.90 | 82.20 | 92.71 | 96.67 | 104.16 | 107.68 | 99.03 | 81.58 | 70.63 | 64.74 | 83.66 | ||||||||||||
1970 | 63.39 | 69.32 | 72.26 | 76.87 | 91.90 | 100.31 | a | 106.16 | 104.83 | a | 95.13 | 82.77 | 72.53 | 60.97 | b | 83.04 | ||||||||||
1971 | 64.61 | 69.43 | 76.65 | 80.37 | 85.53 | a | 98.97 | 106.77 | 102.84 | 97.60 | 80.97 | a | 69.17 | 58.52 | 82.62 | |||||||||||
1972 | 64.65 | 73.24 | 83.58 | 83.30 | 90.76 | b | 98.90 | 108.45 | 102.00 | 94.50 | 77.81 | 65.90 | 60.48 | b | 83.63 | |||||||||||
1973 | 59.06 | 64.39 | 67.10 | a | 79.13 | 94.16 | 102.40 | 107.23 | 102.77 | 96.53 | 86.29 | 70.43 | 65.53 | a | 82.92 | |||||||||||
1974 | 60.13 | 69.07 | 76.13 | 81.38 | a | 93.42 | 105.13 | 103.68 | 103.32 | 99.50 | 84.97 | 71.72 | a | 61.10 | 84.13 | |||||||||||
1975 | 65.58 | 66.57 | 70.32 | 72.72 | a | 89.68 | 99.83 | a | 105.52 | 103.94 | 98.03 | 84.23 | 71.83 | 66.40 | a | 82.89 | ||||||||||
1976 | 66.80 | a | 68.31 | 71.58 | 79.10 | 93.35 | 99.86 | a | 104.68 | 101.10 | 90.37 | 83.37 | a | 75.50 | 64.81 | 83.24 | ||||||||||
1977 | 61.06 | 73.25 | 70.16 | 85.46 | b | 83.42 | 103.30 | 106.55 | 102.03 | 95.83 | 88.58 | 76.13 | 67.58 | 84.45 | ||||||||||||
1978 | 59.94 | 66.04 | 73.97 | 78.20 | 91.48 | 102.67 | 106.48 | 103.97 | 95.37 | 90.13 | 69.80 | 58.29 | 83.03 | |||||||||||||
1979 | 55.29 | 64.68 | 71.35 | 82.73 | 91.26 | 102.70 | 105.84 | 99.39 | 101.45 | a | 87.48 | 70.57 | 67.13 | 83.32 | ||||||||||||
1980 | 65.29 | 70.21 | 71.03 | 81.24 | a | 85.32 | 100.07 | 107.03 | 103.97 | 97.60 | 87.94 | 75.47 | 71.35 | 84.71 | ||||||||||||
1981 | 67.10 | 71.64 | 72.48 | 86.50 | 91.26 | 106.23 | 107.13 | 107.26 | 99.30 | 83.71 | 75.07 | 67.97 | 86.30 | |||||||||||||
1982 | 62.57 | a | 69.00 | a | 71.26 | 82.00 | 91.13 | a | 97.62 | a | 103.00 | 103.17 | a | 95.50 | 82.32 | 66.89 | b | 59.29 | 81.98 | |||||||
1983 | 65.37 | a | 66.44 | a | 71.16 | 75.33 | 91.20 | a | 99.37 | 105.23 | 97.71 | 97.30 | 83.13 | 71.10 | 65.61 | 82.41 | ||||||||||
1984 | 65.90 | 69.24 | 78.23 | 81.83 | 98.03 | a | 99.63 | 102.65 | 101.80 | a | 99.17 | a | 80.97 | 69.77 | 58.77 | 83.83 | ||||||||||
1985 | 61.53 | a | 66.78 | a | 72.93 | a | 88.10 | a | 93.97 | b | 105.07 | 107.14 | b | 105.29 | 91.67 | 84.64 | c | 68.24 | a | 65.13 | a | 84.21 | ||||
1986 | 70.90 | a | 70.85 | a | 79.06 | 82.53 | 93.32 | 104.23 | 103.03 | 105.06 | 90.60 | 82.83 | b | 72.79 | a | 63.24 | b | 84.87 | ||||||||
1987 | 62.70 | d | 66.37 | a | 72.71 | c | 89.97 | a | 91.10 | a | 103.10 | 103.00 | a | 103.55 | 98.23 | d | 87.93 | b | 67.83 | a | 56.70 | h | 86.04 | a | ||
1988 | 62.63 | a | 70.71 | a | 76.34 | b | 81.96 | f | 92.14 | c | 101.00 | e | 108.23 | a | 103.38 | b | 97.47 | 92.94 | 72.61 | g | 63.93 | c | 86.88 | b | ||
1989 | 60.27 | a | 67.86 | 82.30 | a | 90.77 | 92.94 | 101.83 | 108.87 | 102.65 | 97.97 | 84.92 | f | 75.17 | a | 66.33 | a | 86.09 | a | |||||||
1990 | 63.40 | a | 66.92 | c | 77.48 | 85.14 | b | 90.45 | 102.76 | a | 105.87 | 101.90 | 97.60 | 88.30 | d | 72.60 | 59.00 | b | 84.29 | |||||||
1991 | 61.90 | 74.14 | 67.53 | a | 81.66 | a | 88.03 | b | 97.00 | e | 105.03 | b | 102.88 | f | 97.33 | 90.27 | a | 73.33 | 61.55 | b | 81.62 | a | ||||
1992 | 62.39 | 68.07 | a | 70.83 | a | 85.59 | a | 92.65 | 100.77 | h | 103.23 | a | 102.83 | a | 99.90 | a | 87.37 | a | 68.11 | b | ----- | z | 84.10 | b | ||
1993 | 59.73 | a | 63.54 | 77.42 | 85.34 | a | 93.29 | 99.10 | a | 103.68 | 103.37 | a | 98.55 | a | 86.42 | 69.85 | c | 62.97 | 83.61 | |||||||
1994 | 67.26 | 64.42 | b | 77.60 | f | 84.37 | 90.32 | 105.67 | 107.58 | 105.90 | 98.83 | 84.13 | 64.87 | 62.43 | c | 85.07 | a | |||||||||
1995 | 60.35 | 74.70 | a | 72.65 | 81.30 | 86.52 | 98.23 | 106.87 | 107.65 | 101.20 | 89.87 | 79.70 | g | 72.87 | p | 87.93 | b | |||||||||
1996 | 69.48 | f | 72.48 | 78.20 | a | 86.68 | b | 95.13 | 103.57 | 108.79 | b | 106.32 | 96.90 | a | 86.13 | a | 73.07 | 65.70 | a | 88.45 | a | |||||
1997 | 64.19 | 68.62 | b | ----- | z | 82.39 | b | 97.61 | 98.83 | 104.03 | a | 104.81 | 96.40 | 83.93 | b | 72.50 | 59.77 | 84.83 | a | |||||||
1998 | 64.77 | 62.81 | a | 74.03 | a | 77.11 | b | 85.52 | 96.30 | 107.07 | a | 107.13 | 96.43 | 83.68 | 73.07 | 64.74 | 82.72 | |||||||||
1999 | ----- | z | 69.82 | 76.35 | 77.03 | 91.00 | 99.87 | 103.32 | 104.32 | 99.10 | a | 91.97 | 77.67 | 66.94 | 87.04 | a | ||||||||||
2000 | 68.87 | 69.62 | 75.68 | 88.37 | 97.81 | 103.80 | 106.90 | 103.90 | 98.60 | 82.71 | 67.86 | a | 68.71 | 86.07 | ||||||||||||
2001 | 61.65 | 65.32 | 76.84 | 81.63 | 100.10 | a | 104.40 | 104.65 | 106.55 | 101.40 | 90.65 | 75.03 | 62.29 | 85.88 | ||||||||||||
2002 | 64.93 | a | 73.30 | a | 74.90 | a | 86.20 | 92.23 | 104.62 | a | 108.71 | 106.42 | 100.07 | a | 85.35 | 74.63 | 63.13 | 86.21 | ||||||||
2003 | 73.06 | 66.36 | 75.80 | a | 79.38 | a | 93.73 | a | 102.97 | 109.45 | 103.58 | 101.30 | 93.90 | 66.77 | 63.68 | 85.83 | ||||||||||
2004 | 64.45 | 63.71 | a | 83.10 | 84.47 | 94.65 | 102.83 | 107.03 | 103.61 | 97.72 | a | 83.23 | a | 67.83 | a | 63.32 | 84.66 | |||||||||
2005 | 61.54 | c | 62.14 | 71.60 | a | 78.79 | b | 89.94 | 96.00 | 104.70 | d | 98.93 | d | 93.07 | b | 81.89 | d | 74.29 | f | 64.79 | b | 82.13 | a | |||
2006 | 63.83 | a | 70.48 | e | 65.44 | f | 78.46 | b | 93.63 | a | 100.20 | e | 104.23 | 100.62 | b | 93.67 | 82.07 | a | 74.07 | 62.47 | a | 83.97 | a | |||
2007 | 60.52 | d | 68.37 | a | 78.23 | 81.73 | 90.58 | 99.03 | 104.07 | a | 102.29 | 93.07 | 82.96 | f | 74.66 | a | 57.23 | a | 82.71 | a | ||||||
2008 | 58.10 | 66.87 | f | 75.86 | j | 80.17 | g | 85.00 | g | 100.96 | e | 102.28 | f | 101.81 | 95.83 | 85.90 | 75.77 | 59.45 | 82.55 | e | ||||||
2009 | 65.61 | 63.96 | 75.19 | o | 78.63 | 94.10 | 92.13 | 105.07 | a | 101.74 | 98.03 | 79.84 | 73.40 | 59.00 | 82.87 | a | ||||||||||
2010 | 62.27 | a | 65.29 | 70.27 | a | 75.67 | 84.52 | 97.20 | 103.60 | a | 100.55 | 97.53 | 81.21 | b | 69.52 | a | 63.90 | 80.96 | ||||||||
2011 | 64.03 | 63.25 | 73.45 | 79.97 | 84.32 | 95.27 | 100.19 | 103.42 | 96.17 | 84.71 | 68.00 | 60.84 | 81.13 | |||||||||||||
2012 | 67.42 | 67.41 | 73.81 | 81.80 | 92.10 | 99.00 | 100.32 | 101.13 | ----- | z | ----- | z | 76.03 | 64.03 | 82.31 | b | ||||||||||
2013 | 61.16 | 67.54 | 80.68 | 85.93 | 91.77 | 103.67 | 105.45 | 102.06 | 95.20 | 81.23 | 72.43 | 65.52 | 84.39 | |||||||||||||
2014 | 72.29 | 75.43 | 78.74 | 84.03 | 92.71 | 101.20 | 105.32 | 100.13 | 98.37 | 89.52 | 75.27 | 64.52 | 86.46 | |||||||||||||
2015 | 67.71 | 75.54 | 79.74 | 82.03 | 86.87 | 102.87 | 100.29 | 105.29 | 98.63 | 86.97 | 70.20 | 60.74 | 84.74 | |||||||||||||
2016 | 62.84 | 75.83 | 79.55 | 82.30 | 88.06 | 104.70 | 106.52 | 104.23 | 93.40 | 87.52 | 74.87 | 63.74 | 85.30 | |||||||||||||
2017 | 58.87 | 69.50 | 80.26 | 84.27 | 92.06 | 104.30 | 106.61 | 103.52 | 95.10 | 88.68 | 77.53 | 69.23 | 85.83 | |||||||||||||
2018 | 69.03 | 69.54 | 73.61 | 87.90 | 91.21 | c | 102.13 | 105.97 | 104.16 | 99.79 | a | 80.42 | 71.93 | 62.42 | l | 86.88 | a | |||||||||
2019 | 63.41 | d | 59.36 | 70.90 | 83.77 | 82.19 | 98.97 | 104.45 | 104.94 | 94.83 | 81.87 | 73.37 | 58.81 | 81.40 | ||||||||||||
2020 | 65.10 | 71.07 | 68.23 | 79.53 | 93.00 | 99.43 | 105.58 | 107.23 | 100.73 | 91.03 | 73.27 | 64.23 | 84.87 | |||||||||||||
2021 | 63.74 | 68.11 | 70.94 | 85.23 | 91.52 | 104.13 | 105.19 | 105.10 | 98.40 | 80.87 | 79.20 | 62.32 | 84.56 | |||||||||||||
2022 | 65.42 | 67.50 | 76.06 | 86.60 | 91.55 | 101.27 | 104.42 | 103.45 | 97.43 | 85.16 | 66.50 | 62.52 | 83.99 | |||||||||||||
2023 | 59.94 | 62.29 | 67.10 | 82.53 | 88.77 | 94.10 | 108.68 | 102.33 | a | 94.67 | 85.84 | 71.40 | 66.42 | 82.01 | ||||||||||||
2024 | 63.10 | 65.90 | 69.71 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 66.23 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 63.02 | 67.60 | 73.77 | 82.04 | 90.71 | 100.07 | 105.12 | 103.23 | 97.07 | 85.36 | 71.74 | 63.25 | 83.54 | |||||||||||||
S.D. | 4.26 | 3.95 | 4.06 | 3.89 | 3.42 | 3.21 | 1.99 | 2.17 | 2.76 | 3.66 | 3.63 | 3.35 | 1.42 | |||||||||||||
SKEW | -1.05 | 0.26 | 0.17 | -0.14 | -0.12 | -0.33 | -0.14 | -0.18 | -0.76 | 0.35 | 0.08 | 0.25 | 0.13 | |||||||||||||
MAX | 73.06 | 76.96 | 83.58 | 90.77 | 100.10 | 106.23 | 109.45 | 107.68 | 102.07 | 94.32 | 80.17 | 71.94 | 86.46 | |||||||||||||
MIN | 45.23 | 59.36 | 66.16 | 72.43 | 82.19 | 91.40 | 100.19 | 97.71 | 87.67 | 77.81 | 64.87 | 57.23 | 80.90 | |||||||||||||
YRS | 86 | 87 | 84 | 86 | 86 | 87 | 88 | 86 | 88 | 84 | 86 | 83 | 64 |