YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1915 | ----- | z | 64.93 | 71.19 | 80.23 | 86.32 | 99.93 | 101.39 | 104.26 | 95.90 | 91.06 | 75.00 | 64.03 | 84.93 | a | |||||||||||
1916 | 60.16 | 73.21 | 78.58 | 83.87 | 90.35 | 100.80 | 102.71 | 100.68 | 94.93 | 82.48 | 74.53 | 62.81 | 83.76 | |||||||||||||
1917 | 60.83 | a | 66.25 | 70.07 | c | 77.97 | ----- | z | 100.77 | 102.19 | 100.10 | 96.57 | 91.13 | 78.97 | 72.55 | b | 83.40 | a | ||||||||
1918 | 64.52 | b | 69.93 | a | 74.48 | 81.63 | 87.81 | 102.00 | 101.69 | e | 96.84 | 98.60 | 90.35 | 69.62 | d | 62.94 | 83.37 | |||||||||
1919 | 66.65 | 64.46 | 73.04 | f | 86.70 | 93.68 | 103.53 | 100.03 | a | 103.27 | e | 96.42 | k | 82.19 | 71.77 | 68.32 | 84.06 | b | ||||||||
1920 | 64.48 | d | 67.41 | 70.94 | 79.67 | 94.10 | 100.20 | 107.32 | 102.10 | 98.60 | 85.81 | 73.40 | 63.68 | 83.97 | ||||||||||||
1921 | 67.90 | 74.68 | 80.42 | 84.50 | 91.23 | 105.67 | o | 104.87 | 101.45 | 98.87 | 89.58 | g | ----- | z | 68.57 | h | 87.99 | d | ||||||||
1922 | 62.00 | 70.68 | 73.00 | 78.77 | 95.90 | 105.57 | 107.68 | 106.10 | 103.70 | 92.83 | a | 74.08 | r | 70.00 | 87.84 | a | ||||||||||
1923 | 72.13 | ----- | z | ----- | z | ----- | z | ----- | z | 98.83 | 99.97 | 99.13 | 87.90 | a | 75.00 | a | 73.00 | q | 58.19 | 84.45 | e | |||||
1924 | 62.53 | a | 72.76 | 58.14 | q | 78.10 | a | 94.40 | a | 103.37 | 101.74 | 103.03 | 101.20 | ----- | z | 76.10 | 65.39 | h | 88.14 | c | ||||||
1925 | 67.10 | 76.46 | 83.32 | 86.93 | 96.87 | 97.14 | i | 107.03 | a | 100.72 | m | 96.33 | 82.20 | a | 73.52 | g | 65.35 | h | 87.03 | d | ||||||
1926 | 63.26 | 72.25 | 76.13 | 81.60 | 92.52 | 103.43 | 102.61 | 102.48 | 98.63 | 89.10 | 79.64 | p | 62.56 | v | 88.20 | b | ||||||||||
1927 | ----- | z | 66.68 | 70.87 | 80.70 | ----- | z | 99.80 | 105.32 | 99.45 | 95.87 | 90.19 | 80.50 | 65.32 | f | 87.71 | c | |||||||||
1928 | 66.20 | p | 70.21 | e | 79.53 | l | 84.68 | e | 95.94 | 101.47 | 106.96 | g | 103.16 | 99.67 | 91.65 | 75.66 | a | 67.77 | a | 87.80 | c | |||||
1929 | 64.77 | a | 68.85 | b | 75.64 | f | 82.13 | o | 96.27 | e | 104.79 | f | 104.07 | c | 102.13 | a | 98.10 | a | 89.38 | b | 77.10 | a | 75.68 | 86.26 | c | |
1930 | 64.77 | 77.68 | 73.83 | m | 89.00 | d | 86.72 | b | 103.04 | b | 101.24 | b | 94.42 | s | 96.88 | f | 89.68 | 75.31 | d | 69.43 | c | 84.10 | c | |||
1931 | 71.10 | a | ----- | z | 83.00 | d | 87.79 | k | 96.29 | g | 102.33 | l | 107.66 | b | 101.55 | 99.67 | 90.47 | a | 72.52 | g | 64.37 | a | 88.26 | e | ||
1932 | 63.13 | 70.38 | 84.22 | v | 86.93 | b | 93.39 | 101.53 | 104.29 | 105.66 | b | 101.59 | c | 86.40 | a | 81.69 | a | 63.10 | 87.10 | a | ||||||
1933 | 64.07 | b | 67.46 | 79.48 | 81.17 | a | 90.23 | 103.77 | 107.68 | 105.57 | a | 101.10 | 93.23 | 82.55 | a | 73.00 | 87.44 | |||||||||
1934 | 72.76 | b | 77.54 | 87.55 | 91.07 | ----- | z | 100.50 | 106.87 | a | 98.87 | a | 97.34 | a | 92.79 | c | 77.07 | a | 69.08 | f | 90.23 | b | ||||
1935 | 68.41 | d | 71.81 | b | 73.11 | d | 84.87 | 88.79 | l | 105.11 | c | ----- | z | 99.80 | a | 100.28 | e | ----- | z | 75.81 | c | 69.84 | 83.23 | c | ||
1936 | 69.07 | a | 69.83 | 80.48 | b | 92.26 | g | 97.93 | a | 103.21 | f | 104.42 | g | 103.70 | a | 98.50 | 90.24 | b | 78.03 | 69.67 | a | 84.16 | c | |||
1937 | 58.07 | b | 71.14 | 77.59 | b | 87.26 | c | 98.34 | b | 103.21 | b | 106.10 | 106.27 | a | 101.47 | 93.52 | 81.83 | a | 72.97 | b | 88.15 | |||||
1938 | 72.66 | b | 72.22 | a | 76.37 | a | 87.52 | a | 95.61 | c | 103.70 | 106.32 | 100.81 | j | 103.86 | b | 89.58 | 76.23 | 73.81 | e | 87.08 | a | ||||
1939 | 68.97 | 65.58 | b | 81.77 | 91.59 | c | 98.50 | a | 104.70 | 107.55 | 104.10 | 95.41 | a | 88.50 | a | 79.53 | 74.07 | b | 88.36 | |||||||
1940 | 70.52 | b | 71.76 | 81.67 | a | 87.29 | b | 99.48 | 106.47 | 108.19 | 106.16 | 99.69 | a | 89.10 | a | 74.76 | a | 68.48 | 88.63 | |||||||
1941 | 66.77 | a | 71.32 | 73.35 | 78.23 | 93.14 | b | 100.23 | 104.27 | a | 101.65 | 97.54 | b | 83.65 | 78.22 | g | 67.87 | 85.27 | a | |||||||
1942 | 69.14 | b | 68.86 | 77.42 | 83.96 | e | 94.97 | b | 104.47 | 109.16 | 103.69 | b | 102.87 | 88.19 | 81.27 | 71.48 | 87.96 | |||||||||
1943 | 67.23 | 76.11 | 80.29 | 89.90 | a | 97.88 | f | 101.59 | a | 108.30 | a | 102.21 | b | 101.46 | d | 89.23 | 82.87 | g | 66.32 | c | 88.26 | b | ||||
1944 | 67.03 | 65.93 | 73.97 | 81.50 | 93.19 | 99.43 | 106.03 | 107.60 | a | 99.40 | 91.13 | 71.73 | 67.87 | 85.40 | ||||||||||||
1945 | 65.55 | 70.25 | 72.31 | b | 85.37 | 94.32 | 100.97 | 106.76 | b | 103.74 | 101.30 | 90.52 | 77.80 | 66.00 | 86.24 | |||||||||||
1946 | 65.32 | 71.57 | 79.31 | b | 90.87 | 94.42 | 106.37 | 105.21 | g | 103.26 | 100.00 | 84.25 | c | 71.63 | 69.16 | f | 86.70 | b | ||||||||
1947 | 65.40 | f | 77.82 | 80.03 | 86.53 | 97.39 | 102.63 | 109.00 | 102.16 | 103.76 | a | 91.39 | 71.87 | 67.61 | h | 92.26 | b | |||||||||
1948 | 72.23 | a | 69.31 | 72.21 | b | 88.93 | 95.83 | a | 103.10 | 107.37 | a | 106.39 | 102.87 | 89.58 | 74.53 | 65.03 | 87.28 | |||||||||
1949 | 55.29 | 68.29 | 77.45 | 88.70 | 94.32 | 102.63 | 103.77 | a | 105.84 | 101.83 | 84.90 | 82.67 | 66.93 | b | 86.05 | |||||||||||
1950 | 66.48 | 75.82 | 80.33 | a | 90.90 | 94.23 | 103.27 | 102.23 | 105.39 | 98.13 | 97.00 | 82.40 | 75.19 | d | 89.28 | |||||||||||
1951 | 67.71 | 71.32 | 77.10 | 84.97 | a | 95.52 | 104.20 | 108.55 | 101.35 | 101.17 | 89.16 | 74.37 | 64.71 | 86.68 | ||||||||||||
1952 | 65.32 | 70.24 | 69.80 | a | 83.67 | 98.87 | a | 104.33 | 106.10 | 105.23 | a | 102.33 | 96.84 | 71.83 | 64.81 | 86.61 | ||||||||||
1953 | 72.48 | 72.50 | 78.90 | 84.14 | a | 89.23 | a | 105.00 | 104.70 | a | 105.97 | 105.10 | 90.81 | 78.97 | 66.97 | 87.90 | ||||||||||
1954 | 68.87 | 79.14 | 76.33 | j | 91.43 | 97.55 | 103.03 | 105.29 | 102.16 | 102.56 | e | 92.81 | 81.97 | 68.87 | 90.33 | a | ||||||||||
1955 | 60.74 | 67.93 | 78.97 | a | 84.40 | 93.68 | 102.73 | 102.48 | 100.03 | 101.20 | 94.42 | 76.50 | 72.42 | 86.29 | ||||||||||||
1956 | 70.77 | 66.76 | 82.71 | 84.80 | 97.74 | 107.07 | 105.19 | 103.39 | 104.97 | 90.19 | 77.00 | 70.84 | 88.45 | |||||||||||||
1957 | 64.61 | 75.54 | 77.39 | 84.60 | 89.55 | 104.97 | 106.68 | 102.42 | 99.93 | 83.81 | 72.10 | a | 70.32 | c | 85.99 | |||||||||||
1958 | 69.90 | 73.25 | 71.60 | a | 84.90 | 100.57 | c | 104.00 | q | ----- | z | 104.72 | m | 101.14 | a | 90.35 | e | 76.23 | d | 76.61 | h | 83.49 | d | |||
1959 | 71.58 | 69.39 | 82.00 | 91.59 | a | 92.65 | e | 109.47 | m | 109.13 | a | ----- | z | 99.07 | 91.45 | b | 76.96 | c | 66.86 | c | 85.07 | b | ||||
1960 | 61.77 | 65.52 | b | ----- | z | 85.87 | 97.72 | f | 110.80 | e | ----- | z | 104.64 | f | ----- | z | ----- | z | ----- | z | ----- | z | 80.99 | h | ||
1961 | 69.89 | m | 72.50 | 75.48 | 85.38 | a | 91.68 | 102.27 | 103.03 | a | 100.45 | b | 93.73 | 86.13 | 71.40 | 64.65 | 86.06 | a | ||||||||
1962 | 64.74 | 68.93 | a | 72.13 | a | 88.50 | 89.81 | 98.63 | 102.42 | 105.00 | 96.31 | a | 87.71 | 78.20 | 69.39 | 85.15 | ||||||||||
1963 | 63.23 | 76.25 | 75.23 | 80.73 | 94.90 | 97.17 | 105.74 | 99.52 | 98.20 | 89.06 | 73.67 | 66.84 | 85.04 | |||||||||||||
1964 | 63.45 | 65.69 | 70.45 | 80.47 | 89.03 | 96.67 | 102.00 | ----- | z | ----- | z | ----- | z | 69.73 | 65.19 | 78.08 | c | |||||||||
1965 | 66.13 | 68.29 | 70.87 | 78.13 | 86.97 | b | 93.17 | a | 99.42 | 98.55 | ----- | z | 88.97 | 76.03 | a | 65.16 | 81.06 | a | ||||||||
1966 | 63.39 | 64.93 | 78.55 | 86.67 | 95.48 | 100.47 | 102.71 | 100.52 | 95.77 | 87.42 | 76.90 | 67.52 | 85.03 | |||||||||||||
1967 | 67.16 | 74.57 | 79.35 | 78.33 | 90.52 | 96.20 | 101.03 | 101.13 | 97.23 | 89.32 | 78.80 | 60.50 | a | 84.51 | ||||||||||||
1968 | 66.58 | 73.59 | 75.42 | 81.63 | 91.10 | 99.83 | 100.03 | 97.19 | 97.40 | 87.45 | 72.57 | 64.13 | 83.91 | |||||||||||||
1969 | 67.52 | 67.79 | 73.61 | 85.60 | 94.23 | 97.37 | 103.00 | 103.71 | 98.00 | 83.94 | 73.77 | 67.67 | a | 84.68 | ||||||||||||
1970 | 66.29 | 74.50 | 74.13 | 80.57 | 94.00 | 100.47 | 103.71 | 101.29 | 93.47 | 83.35 | 75.60 | 66.06 | 84.45 | |||||||||||||
1971 | 68.35 | 71.79 | 80.29 | 82.86 | a | 87.52 | 99.13 | 103.48 | 98.16 | 97.03 | 81.48 | 73.80 | 62.71 | 83.88 | ||||||||||||
1972 | 67.55 | 75.93 | 86.52 | 86.66 | a | 91.87 | 99.83 | 105.43 | a | 100.39 | 96.43 | 80.58 | ----- | z | 62.97 | 86.74 | a | |||||||||
1973 | 62.40 | a | 67.57 | 67.65 | 81.57 | 93.84 | 101.00 | 102.74 | 102.35 | 97.50 | 89.00 | 72.67 | 68.06 | 83.86 | ||||||||||||
1974 | 64.55 | 71.21 | 77.81 | 84.80 | 93.48 | 103.77 | 99.94 | 100.68 | 96.17 | 84.84 | 72.97 | 61.35 | 84.30 | |||||||||||||
1975 | 65.03 | 68.71 | 73.13 | 77.90 | 90.55 | 99.03 | 101.84 | 102.74 | 97.23 | 86.26 | 74.67 | 66.84 | 83.66 | |||||||||||||
1976 | 68.48 | 72.66 | 75.45 | 82.97 | 92.16 | 100.77 | 99.30 | a | 99.61 | 93.23 | 82.71 | 75.57 | 67.58 | 84.21 | ||||||||||||
1977 | 64.97 | 75.25 | 74.29 | 86.40 | 87.87 | 101.97 | 101.90 | 101.68 | 97.28 | a | 89.19 | 77.20 | 69.26 | 85.60 | ||||||||||||
1978 | 64.55 | 68.43 | 77.35 | 82.83 | 92.13 | 103.70 | 104.23 | 101.13 | 97.07 | 91.71 | 73.20 | 63.90 | 85.02 | |||||||||||||
1979 | 59.71 | 70.21 | 73.90 | 85.00 | a | 90.00 | 101.13 | 104.33 | a | 100.55 | 101.73 | 90.52 | 74.37 | 71.13 | 85.22 | |||||||||||
1980 | 68.03 | 72.72 | 73.32 | 83.97 | 87.90 | 102.00 | 104.32 | 100.45 | 97.97 | 87.58 | 76.83 | 73.61 | 85.73 | |||||||||||||
1981 | 69.74 | 74.25 | 75.26 | 88.07 | 90.87 | 102.83 | 102.06 | 102.32 | 97.00 | 84.65 | 78.23 | 69.55 | 86.24 | |||||||||||||
1982 | 64.45 | 71.89 | a | 73.48 | 85.39 | b | 90.90 | b | 98.23 | 100.81 | 100.75 | c | 96.73 | d | 86.27 | a | 71.55 | a | 63.97 | 83.70 | ||||||
1983 | 69.00 | a | 68.96 | 74.00 | b | 80.04 | e | 94.59 | b | 100.69 | a | 105.63 | a | 103.00 | c | 101.26 | c | 87.50 | a | 73.93 | a | 67.17 | a | 85.48 | ||
1984 | 68.55 | 73.82 | a | 82.31 | b | 84.70 | c | 100.45 | b | 100.60 | 100.90 | a | 102.41 | b | 97.52 | a | 83.13 | a | 73.50 | 62.50 | a | 85.87 | ||||
1985 | 63.73 | a | 69.44 | a | 75.81 | d | 89.33 | c | 93.93 | b | 102.57 | 102.67 | a | 102.26 | d | 91.23 | d | 84.50 | c | 71.18 | b | 66.47 | a | 84.43 | ||
1986 | 73.13 | 72.07 | a | 81.82 | c | 85.72 | a | 93.81 | d | 101.63 | c | 99.79 | b | 100.94 | 92.75 | b | 83.40 | a | 73.79 | a | 65.13 | 85.33 | ||||
1987 | 65.57 | a | 70.31 | b | 74.83 | b | 89.62 | d | 91.46 | c | 101.24 | a | 102.71 | c | 100.68 | c | 95.50 | b | 89.97 | a | 71.66 | a | 61.14 | b | 84.56 | |
1988 | 64.37 | a | 73.96 | b | 79.85 | e | 83.24 | e | 92.15 | d | 101.38 | d | 102.82 | c | 100.71 | c | 96.10 | 91.40 | a | 73.47 | 64.63 | a | 85.34 | |||
1989 | 64.60 | a | 73.08 | b | 83.69 | e | 91.88 | e | 94.22 | d | 100.34 | a | 104.15 | d | 100.63 | a | 98.41 | a | 86.00 | b | 76.97 | 68.50 | a | 86.87 | ||
1990 | 66.06 | 69.82 | f | 78.93 | d | 87.15 | d | 91.44 | d | 103.00 | b | 100.25 | c | 98.29 | c | 95.50 | b | 89.00 | a | 76.14 | b | 62.60 | a | 86.22 | a | |
1991 | 65.06 | 77.42 | b | 70.08 | f | 83.35 | d | 92.04 | d | 96.34 | a | 102.12 | e | 100.71 | c | 95.70 | c | 89.24 | b | 72.38 | a | 65.19 | 85.41 | a | ||
1992 | 65.20 | a | 71.41 | b | 74.15 | d | 87.76 | a | 91.38 | b | 98.75 | b | 101.04 | d | 100.38 | e | 98.07 | 88.61 | 70.24 | a | 61.77 | 84.06 | ||||
1993 | 65.13 | 67.11 | a | 77.83 | a | 86.75 | b | 94.42 | 100.04 | b | 100.70 | a | 100.18 | c | 97.69 | a | 86.00 | c | 71.57 | 68.10 | 84.63 | |||||
1994 | 70.00 | a | 70.39 | 79.67 | a | 85.07 | a | 90.96 | c | 102.81 | c | 102.90 | b | 103.00 | b | 97.74 | c | 84.80 | a | 69.70 | 66.81 | 85.32 | ||||
1995 | 64.62 | b | 77.27 | b | 77.62 | b | 82.79 | b | 87.52 | b | 98.78 | c | 103.83 | a | 103.17 | b | 98.71 | b | 89.45 | 79.03 | 68.90 | 85.97 | ||||
1996 | 70.35 | 74.57 | a | 80.72 | b | 88.52 | c | 96.86 | c | 104.31 | a | 104.97 | b | 103.72 | b | 94.68 | b | 87.33 | a | 77.83 | 69.57 | a | 87.79 | |||
1997 | 66.81 | 71.58 | b | 84.07 | c | 84.37 | c | 97.71 | c | 99.67 | c | 103.39 | c | 102.43 | h | 98.22 | c | 86.41 | b | 75.23 | 63.33 | a | 84.62 | a | ||
1998 | 67.36 | c | 64.38 | d | 74.00 | e | 80.21 | f | 88.63 | d | 97.88 | d | 104.00 | e | 102.96 | d | 96.73 | d | 84.94 | 74.90 | a | 67.13 | 83.90 | a | ||
1999 | 70.40 | a | 75.07 | a | 79.04 | c | 80.08 | d | 91.68 | 98.14 | a | 99.66 | b | 100.43 | a | 97.83 | 93.61 | 79.77 | 67.33 | a | 86.09 | |||||
2000 | 70.06 | 74.00 | c | 75.54 | c | 88.36 | b | 96.82 | c | 98.71 | b | 102.18 | c | 98.96 | c | 97.96 | b | 80.76 | b | 65.13 | 67.94 | 84.70 | ||||
2001 | 64.42 | e | 67.72 | c | 76.72 | b | 82.04 | c | 97.56 | d | 100.38 | a | 100.48 | d | 100.21 | c | 99.10 | a | 87.69 | b | 74.79 | a | 62.55 | b | 84.47 | |
2002 | 65.38 | b | 73.38 | b | 76.07 | d | 86.36 | e | 92.36 | c | 102.72 | e | 102.69 | e | 101.63 | a | 96.89 | c | 83.30 | a | 75.27 | 63.33 | a | 84.95 | ||
2003 | 72.48 | b | 67.37 | a | 75.14 | b | 82.17 | g | 92.72 | b | 99.96 | b | 104.04 | e | 100.62 | e | 98.37 | c | 90.77 | a | 70.04 | b | 65.90 | b | 85.22 | a |
2004 | 67.43 | c | 66.26 | b | 83.48 | 83.63 | 94.23 | a | 101.14 | a | 102.64 | c | 100.55 | b | 95.65 | d | 83.66 | b | 69.07 | a | 64.74 | 84.37 | ||||
2005 | 66.03 | 66.54 | 72.87 | a | 83.48 | c | 93.13 | a | 99.76 | a | 105.61 | 99.90 | 96.83 | 86.42 | 75.70 | 68.23 | 84.54 | |||||||||
2006 | 69.65 | 74.38 | b | 72.39 | 84.57 | b | 95.65 | 103.62 | a | 103.26 | d | 99.84 | 93.86 | a | 84.52 | 78.07 | b | 64.07 | a | 85.32 | ||||||
2007 | 64.12 | f | 71.54 | b | 80.24 | b | 85.37 | c | 94.60 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 82.94 | h |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 66.44 | 71.12 | 76.86 | 84.78 | 93.29 | 101.51 | 103.78 | 101.92 | 98.26 | 87.90 | 75.27 | 66.93 | 85.57 | |||||||||||||
S.D. | 3.47 | 3.58 | 4.15 | 3.59 | 3.30 | 2.74 | 2.60 | 2.27 | 3.04 | 3.84 | 3.53 | 3.59 | 1.47 | |||||||||||||
SKEW | -0.29 | 0.08 | 0.22 | -0.03 | -0.03 | 0.11 | 0.29 | 0.33 | -0.19 | -0.34 | 0.05 | 0.29 | 0.73 | |||||||||||||
MAX | 73.13 | 79.14 | 87.55 | 91.88 | 100.57 | 110.80 | 109.16 | 107.60 | 105.10 | 97.00 | 82.67 | 75.68 | 89.28 | |||||||||||||
MIN | 55.29 | 64.38 | 67.65 | 77.90 | 86.32 | 93.17 | 99.30 | 96.84 | 87.90 | 75.00 | 65.13 | 58.19 | 83.37 | |||||||||||||
YRS | 87 | 90 | 83 | 87 | 85 | 85 | 86 | 84 | 87 | 87 | 82 | 82 | 56 |