YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1916 | 59.31 | o | 78.24 | 81.13 | 83.60 | 94.61 | 102.97 | a | ----- | z | 101.65 | 96.93 | 83.36 | c | 75.53 | ----- | z | 88.67 | c | |||||||
1917 | ----- | z | 69.65 | k | 71.13 | h | 83.28 | e | 84.97 | b | 101.93 | 105.28 | b | 101.29 | 96.97 | 92.71 | 80.00 | 75.84 | 91.36 | c | ||||||
1918 | 66.06 | 72.29 | 75.81 | 84.63 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 74.70 | h | ||||
1919 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1920 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1921 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1922 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1923 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1924 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1925 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1926 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1927 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1928 | ----- | z | 69.81 | b | 76.84 | 77.31 | q | 94.29 | 101.77 | 105.81 | 100.87 | 98.63 | 85.42 | ----- | z | 64.26 | 88.63 | c | ||||||||
1929 | 62.26 | 66.89 | 75.03 | 80.30 | 91.35 | 101.43 | 102.77 | a | 99.74 | 93.07 | 85.19 | 72.90 | 71.29 | 83.52 | ||||||||||||
1930 | 58.00 | a | 73.37 | a | 72.20 | a | 85.14 | a | 83.29 | 101.13 | 100.94 | 98.71 | 93.33 | 84.47 | a | 67.52 | a | 64.23 | 81.86 | |||||||
1931 | 65.35 | 63.07 | 75.48 | 81.37 | c | 93.58 | 99.03 | 106.00 | 98.58 | 95.47 | 84.65 | 64.27 | d | 58.65 | 82.13 | |||||||||||
1932 | 56.52 | 64.44 | b | 72.77 | 83.17 | a | 90.23 | 98.53 | 102.42 | 102.06 | 97.97 | 82.45 | 77.40 | 58.43 | a | 82.20 | ||||||||||
1933 | 57.63 | a | 61.85 | a | 72.94 | 79.00 | a | 84.94 | 100.60 | 105.42 | 102.42 | 96.20 | 86.77 | 77.07 | a | 65.20 | a | 82.50 | ||||||||
1934 | 66.39 | ----- | z | 82.63 | a | 86.87 | 95.61 | 95.97 | a | 105.87 | 98.80 | a | 96.72 | a | 87.81 | 70.77 | 65.71 | 86.65 | a | |||||||
1935 | 64.29 | 67.29 | 68.03 | b | 81.27 | 88.90 | 104.50 | 104.81 | 98.68 | 95.40 | 86.39 | 69.90 | ----- | z | 84.50 | a | ||||||||||
1936 | ----- | z | ----- | z | ----- | z | 95.07 | a | 97.45 | 105.63 | 105.10 | 101.81 | ----- | z | ----- | z | ----- | z | ----- | z | 101.01 | g | ||||
1937 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1938 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1939 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1940 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1941 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1942 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1943 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1944 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1945 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1946 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1947 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1949 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1950 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1951 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1952 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1953 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1954 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1955 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1956 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1957 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1958 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1959 | ----- | z | 68.44 | c | 79.06 | 85.70 | c | 88.03 | a | 101.83 | 104.03 | 97.26 | 94.72 | a | 86.97 | 75.62 | a | 65.32 | 86.09 | a | ||||||
1960 | 60.84 | 64.18 | a | 79.03 | 84.03 | 90.00 | a | 102.60 | 103.65 | 100.71 | 98.67 | 83.74 | 76.10 | 67.48 | 84.25 | |||||||||||
1961 | 71.45 | 72.32 | 73.70 | a | 83.66 | a | 89.23 | 102.79 | a | 102.55 | 99.19 | 91.77 | 85.90 | 70.83 | 64.32 | 83.98 | ||||||||||
1962 | 64.26 | 65.68 | 67.87 | 86.77 | 86.73 | a | 97.33 | 100.81 | 103.42 | 96.00 | 86.94 | 78.30 | 69.81 | 83.66 | ||||||||||||
1963 | 63.37 | a | 74.71 | 72.39 | 77.31 | a | 91.97 | 94.10 | 103.19 | 96.97 | 97.73 | 88.90 | 74.57 | 70.45 | 83.81 | |||||||||||
1964 | 64.97 | 65.07 | 70.00 | 78.47 | 87.87 | 96.07 | 102.73 | a | 97.06 | 94.43 | 91.45 | 71.60 | 66.45 | 82.18 | ||||||||||||
1965 | 67.48 | 67.04 | 69.19 | 76.33 | 85.94 | 92.30 | 102.13 | 101.71 | 92.20 | 92.32 | 76.27 | 65.29 | 82.35 | |||||||||||||
1966 | 62.77 | a | 64.07 | a | 77.61 | 86.40 | 94.97 | 101.37 | 105.13 | 101.71 | 94.03 | 87.50 | a | 79.20 | 69.29 | 85.34 | ||||||||||
1967 | 68.42 | 73.82 | 76.06 | 73.10 | 89.74 | 94.73 | 102.74 | 101.94 | 95.43 | 90.81 | 77.73 | 59.35 | 83.66 | |||||||||||||
1968 | 67.03 | 72.97 | 72.29 | 78.70 | 91.03 | 102.70 | 102.55 | 96.65 | ----- | z | 88.23 | a | ----- | z | 63.45 | 83.56 | b | |||||||||
1969 | 65.16 | 64.26 | a | 68.58 | 81.07 | a | 93.94 | 97.93 | 103.71 | 106.13 | 97.97 | 83.29 | 73.60 | 68.13 | 83.65 | |||||||||||
1970 | 64.84 | 72.04 | 70.65 | 76.33 | 93.58 | 101.53 | 106.48 | 102.61 | 93.47 | 83.29 | 76.10 | 64.74 | 83.81 | |||||||||||||
1971 | 68.53 | a | 69.71 | 76.61 | 79.57 | 85.71 | 99.70 | 105.87 | 97.65 | 96.80 | 79.55 | 73.80 | 61.45 | 82.91 | ||||||||||||
1972 | 66.65 | 73.03 | 82.58 | 82.30 | 92.10 | a | 100.03 | 106.55 | 100.45 | 96.37 | 79.19 | 66.90 | 63.57 | a | 84.14 | |||||||||||
1973 | 61.87 | 64.68 | 61.40 | a | 76.83 | a | 93.90 | a | 102.23 | 104.71 | 103.87 | 98.60 | 89.29 | 72.77 | 69.52 | 83.31 | ||||||||||
1974 | 63.61 | 69.43 | 73.58 | 81.50 | 91.68 | 106.23 | 101.37 | a | 100.77 | 96.53 | 85.16 | 74.63 | 63.42 | 83.99 | ||||||||||||
1975 | 65.81 | 66.43 | 68.77 | 72.70 | 89.45 | 98.03 | 101.10 | 103.35 | 97.20 | 84.94 | 76.67 | 69.42 | 82.82 | |||||||||||||
1976 | 69.06 | 70.00 | 72.55 | 76.87 | 90.00 | 101.00 | 103.27 | a | 102.10 | ----- | z | 82.84 | 77.93 | ----- | z | 84.56 | b | |||||||||
1977 | ----- | z | 72.29 | 69.29 | 81.63 | 83.19 | 103.33 | 104.13 | 102.87 | 96.80 | 88.00 | 77.50 | 69.90 | 86.27 | a | |||||||||||
1978 | 63.71 | 65.11 | 73.71 | 76.93 | 88.58 | 103.63 | 106.13 | 101.32 | 95.67 | 90.19 | 69.80 | 60.61 | 82.95 | |||||||||||||
1979 | 56.55 | 66.32 | 69.52 | 79.37 | 85.90 | 99.27 | 103.10 | 99.97 | ----- | z | ----- | z | 73.37 | 71.16 | 80.45 | b | ||||||||||
1980 | 64.39 | 69.24 | 68.39 | 79.50 | 83.61 | 99.77 | 104.74 | 101.03 | a | 96.73 | 86.81 | 77.53 | 74.23 | 83.83 | ||||||||||||
1981 | 68.94 | 72.25 | 70.87 | a | 83.90 | 87.55 | 102.27 | 104.13 | 102.87 | 96.80 | 82.24 | f | 77.17 | g | 69.68 | 85.92 | b | |||||||||
1982 | 63.46 | c | 71.92 | b | 69.52 | d | 76.97 | 85.67 | a | 95.86 | a | 101.26 | 99.61 | 93.03 | 84.58 | 69.63 | 62.23 | 81.15 | ||||||||
1983 | 66.19 | 64.85 | a | 67.73 | a | 73.23 | 89.90 | a | 96.43 | 101.81 | 97.68 | 95.68 | b | 83.13 | 69.83 | 64.13 | 80.88 | |||||||||
1984 | 67.26 | 70.86 | a | 76.84 | 78.85 | c | 95.68 | 95.43 | 98.83 | a | 97.33 | a | 94.97 | a | 78.61 | 71.86 | a | 61.69 | b | 82.35 | ||||||
1985 | 61.94 | 66.22 | a | 71.07 | d | 84.33 | 90.86 | b | 100.73 | 102.16 | 101.32 | 89.13 | 82.74 | 69.10 | 68.13 | 82.31 | ||||||||||
1986 | 73.55 | 69.29 | 77.23 | 81.87 | 90.94 | 99.43 | 98.26 | 100.13 | 89.37 | 81.94 | 74.30 | 65.81 | 83.51 | |||||||||||||
1987 | 65.26 | 67.21 | 71.32 | 85.93 | 88.23 | 99.93 | 99.84 | 99.10 | 94.47 | 88.42 | 71.40 | 61.39 | 82.71 | |||||||||||||
1988 | 64.45 | 72.14 | 75.39 | 79.70 | 89.67 | a | 100.93 | 102.81 | 98.32 | 94.40 | 90.74 | 73.10 | 65.16 | 83.90 | ||||||||||||
1989 | 64.52 | 69.89 | 79.19 | 88.23 | 91.97 | 99.57 | 104.39 | 99.13 | 96.47 | 84.97 | 77.24 | a | 69.23 | 85.40 | ||||||||||||
1990 | 65.48 | 65.93 | 74.53 | a | 82.20 | 87.19 | 102.00 | 100.03 | 97.74 | 95.27 | 88.23 | 76.60 | 63.52 | 83.23 | ||||||||||||
1991 | 65.35 | 76.68 | 65.55 | 79.80 | 86.61 | 94.83 | 102.10 | a | 100.74 | 94.93 | 88.77 | 72.73 | 64.74 | 82.74 | ||||||||||||
1992 | 65.71 | 68.72 | 69.74 | 84.73 | 89.55 | 96.87 | 100.03 | 98.42 | 96.10 | 87.71 | 71.38 | a | 61.74 | 82.56 | ||||||||||||
1993 | 63.00 | 63.21 | 74.13 | 82.67 | 91.19 | 98.17 | 99.90 | 99.10 | 96.23 | 84.90 | 71.03 | a | 67.68 | 82.60 | ||||||||||||
1994 | 69.94 | 66.89 | 75.77 | 81.62 | a | 87.00 | 102.97 | 102.39 | 102.77 | 96.20 | 83.42 | 68.53 | 66.29 | 83.65 | ||||||||||||
1995 | 62.74 | 73.64 | 72.68 | 77.53 | 83.87 | 95.93 | a | 104.03 | 103.10 | 96.90 | 89.58 | 80.17 | 69.94 | 84.18 | ||||||||||||
1996 | 69.35 | 73.31 | 76.39 | 83.54 | f | 92.63 | a | 102.20 | ----- | z | ----- | z | ----- | z | ----- | z | 76.90 | ----- | z | 81.80 | f | |||||
1997 | ----- | z | ----- | z | ----- | z | ----- | z | 95.61 | 96.10 | 102.33 | a | 101.10 | 96.90 | 85.00 | 74.17 | 62.65 | 89.23 | d | |||||||
1998 | 65.58 | 60.89 | 69.84 | 75.00 | b | 84.72 | b | 94.66 | a | 102.71 | 103.07 | p | 94.77 | 83.70 | a | 74.67 | 66.90 | a | 79.40 | a | ||||||
1999 | 70.16 | 72.68 | 75.96 | c | ----- | z | 91.11 | m | 99.11 | c | 99.22 | h | 101.08 | r | 97.03 | a | 92.31 | b | 81.87 | 68.27 | a | 82.17 | d | |||
2000 | 70.06 | 71.41 | 74.03 | b | 86.57 | 96.21 | b | 100.46 | d | 103.52 | 100.30 | a | 97.84 | k | 82.17 | b | 67.81 | c | 70.30 | a | 83.90 | a | ||||
2001 | 64.96 | d | 66.54 | 75.67 | g | 83.07 | b | 98.69 | b | 104.63 | 102.70 | d | 102.58 | 102.46 | b | 91.13 | 78.17 | a | 66.40 | a | 87.39 | a | ||||
2002 | 69.07 | b | 75.04 | 77.62 | b | 86.45 | a | 93.20 | a | 105.07 | a | 105.77 | a | 103.53 | a | 97.27 | 84.03 | b | 78.38 | d | 64.48 | 86.66 | ||||
2003 | 75.00 | b | 65.50 | b | 71.77 | a | 77.70 | 90.27 | a | 99.28 | a | 105.64 | c | 101.39 | c | 98.14 | b | 91.60 | a | 70.13 | 66.81 | 84.44 | ||||
2004 | 65.87 | 63.62 | 80.90 | 80.21 | b | 91.29 | 99.21 | a | 102.50 | c | 100.04 | c | 95.03 | 82.82 | c | 67.18 | b | 64.87 | 82.80 | |||||||
2005 | 64.93 | b | 64.39 | 71.15 | e | 80.97 | a | 90.89 | c | 97.54 | b | 104.60 | a | 97.86 | i | 95.79 | b | 85.45 | b | 77.17 | 69.23 | a | 82.01 | a | ||
2006 | 69.26 | 73.00 | b | 69.68 | c | 81.18 | b | 93.54 | c | 102.60 | 103.93 | c | 99.96 | c | 93.04 | b | 84.37 | a | 77.87 | 65.00 | 84.45 | |||||
2007 | 63.17 | a | 69.14 | 77.93 | a | 81.39 | b | 94.65 | h | 101.45 | a | 103.10 | a | 102.87 | a | 96.27 | 87.37 | d | 80.17 | 61.39 | 84.02 | a | ||||
2008 | 61.76 | b | 66.52 | b | 76.16 | 82.69 | a | 87.40 | f | 102.43 | b | 102.34 | b | 102.25 | c | 97.93 | ----- | z | 79.20 | 64.21 | b | 83.55 | b | |||
2009 | 70.53 | a | 70.30 | a | 76.57 | a | 80.14 | a | 93.61 | 93.93 | 104.89 | c | 103.83 | b | 97.66 | a | 83.06 | 78.20 | 61.39 | 84.51 | ||||||
2010 | 65.48 | 65.00 | a | 70.06 | 78.57 | 86.35 | 98.23 | 102.06 | 99.94 | 99.85 | j | 84.42 | 72.03 | 68.45 | 80.96 | a | ||||||||||
2011 | 67.32 | 64.18 | 76.32 | 81.87 | 86.68 | 98.37 | 102.39 | 105.48 | 98.63 | 88.65 | 71.13 | 61.74 | 83.56 | |||||||||||||
2012 | 69.65 | 68.69 | 75.81 | 84.50 | 93.19 | 100.77 | 100.48 | 101.84 | 96.63 | 89.13 | 80.70 | 63.65 | 85.42 | |||||||||||||
2013 | 63.58 | 65.50 | 77.39 | 82.60 | 89.35 | 101.40 | 98.54 | c | 100.59 | b | 92.60 | e | 82.65 | 74.17 | 65.45 | 82.82 | ||||||||||
2014 | 71.45 | 72.71 | 76.94 | 83.30 | 89.84 | 99.23 | 101.81 | 97.86 | b | 95.13 | 88.52 | 75.63 | 64.03 | 84.70 | ||||||||||||
2015 | 68.52 | 75.14 | 80.52 | 81.73 | 85.16 | 101.33 | 99.84 | 103.32 | 97.27 | 86.00 | 70.37 | 63.84 | 84.42 | |||||||||||||
2016 | 64.23 | 76.88 | e | 81.32 | 84.37 | 89.19 | 105.93 | 107.03 | 101.00 | 94.83 | 91.13 | 77.57 | 68.52 | 86.83 | ||||||||||||
2017 | 64.16 | 71.07 | 82.03 | 87.00 | 94.58 | 108.25 | b | 106.16 | 104.61 | 97.83 | 92.95 | k | 82.97 | 74.13 | 88.44 | a | ||||||||||
2018 | 75.55 | 71.54 | 78.90 | 90.63 | 95.77 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 82.48 | g | ||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 65.76 | 68.98 | 74.04 | 81.62 | 90.19 | 100.08 | 103.12 | 100.81 | 95.83 | 86.18 | 74.39 | 65.91 | 83.50 | |||||||||||||
S.D. | 3.84 | 4.05 | 4.43 | 4.08 | 3.75 | 3.27 | 2.11 | 2.18 | 2.21 | 3.34 | 4.08 | 3.72 | 1.23 | |||||||||||||
SKEW | 0.04 | 0.15 | -0.13 | 0.29 | 0.04 | -0.10 | -0.25 | 0.05 | -0.55 | 0.04 | -0.21 | 0.34 | 0.50 | |||||||||||||
MAX | 75.55 | 78.24 | 82.63 | 95.07 | 98.69 | 108.25 | 107.03 | 106.13 | 102.46 | 92.71 | 82.97 | 75.84 | 86.83 | |||||||||||||
MIN | 56.52 | 60.89 | 61.40 | 72.70 | 83.19 | 92.30 | 98.26 | 96.65 | 89.13 | 78.61 | 64.27 | 58.43 | 80.88 | |||||||||||||
YRS | 65 | 68 | 68 | 68 | 68 | 70 | 67 | 66 | 63 | 64 | 66 | 65 | 47 |