YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1929 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1930 | 58.70 | a | 73.86 | 70.90 | 84.83 | a | 84.42 | 101.17 | 103.77 | 103.57 | a | 96.17 | 83.90 | 71.10 | 64.13 | 83.04 | ||||||||||
1931 | 63.58 | 64.07 | 73.35 | 82.10 | 91.65 | 99.07 | 105.48 | 98.68 | 94.83 | 83.97 | 66.30 | 59.03 | 81.84 | |||||||||||||
1932 | 55.65 | 62.72 | 71.35 | 80.73 | 89.10 | 98.63 | 103.55 | 104.58 | 100.97 | 84.58 | 79.73 | 59.94 | 82.63 | |||||||||||||
1933 | 60.03 | 60.82 | 75.61 | 77.90 | 84.23 | 102.23 | 108.06 | 104.74 | 99.90 | 91.39 | 80.40 | 67.52 | 84.40 | |||||||||||||
1934 | 68.35 | 73.29 | 84.74 | 88.90 | 97.58 | 96.93 | 106.74 | 102.26 | 97.67 | 89.45 | 75.70 | 67.16 | 87.40 | |||||||||||||
1935 | 63.39 | 67.75 | 67.97 | 81.53 | 85.68 | 104.17 | 104.97 | 99.84 | 96.47 | 86.71 | 71.20 | 66.94 | 83.05 | |||||||||||||
1936 | 66.77 | a | 64.76 | 78.19 | 87.90 | 97.32 | 104.47 | 106.52 | 102.81 | 96.80 | 86.03 | 75.37 | 64.06 | 85.92 | ||||||||||||
1937 | 51.26 | 65.07 | 70.81 | 82.83 | 94.61 | 101.20 | 106.26 | 106.10 | 101.03 | 91.65 | 78.63 | 69.77 | 84.94 | |||||||||||||
1938 | 68.87 | a | 66.64 | 70.71 | 84.13 | 91.29 | 101.87 | 103.87 | 103.48 | 101.13 | 87.71 | 71.43 | 69.03 | 85.01 | ||||||||||||
1939 | 62.97 | 58.25 | 75.32 | 86.57 | 94.42 | 102.07 | 106.45 | 102.74 | 92.50 | 85.23 | 76.73 | 71.55 | 84.57 | |||||||||||||
1940 | 67.10 | 67.79 | 78.68 | 83.47 | 97.19 | 104.83 | 105.58 | 103.81 | 95.20 | 85.27 | a | 69.87 | 65.39 | 85.35 | ||||||||||||
1941 | 61.32 | 66.07 | a | 69.26 | 72.93 | 90.26 | 98.47 | 104.13 | 100.71 | 95.57 | 81.77 | 76.87 | 65.65 | 81.92 | ||||||||||||
1942 | 66.03 | 64.75 | 71.06 | 80.17 | 90.84 | 100.93 | 107.60 | a | 101.83 | a | 99.27 | 86.32 | 79.03 | 69.97 | 84.82 | |||||||||||
1943 | 65.42 | 71.79 | 77.11 | d | 84.60 | 94.00 | a | 97.28 | a | 104.90 | a | 98.35 | 99.00 | 85.61 | 77.20 | 63.81 | 84.92 | |||||||||
1944 | 63.63 | a | 61.59 | 68.16 | 75.57 | 88.16 | 95.77 | 104.77 | a | 105.45 | 97.50 | 89.03 | 71.50 | 68.30 | a | 82.45 | ||||||||||
1945 | 63.68 | 68.14 | 67.81 | 78.07 | 88.16 | f | 94.00 | a | 104.00 | 100.29 | 98.67 | 86.35 | 74.10 | 62.55 | 81.60 | a | ||||||||||
1946 | 61.39 | 66.68 | 74.32 | 86.20 | 90.26 | 102.80 | 102.53 | a | 102.19 | 96.80 | 79.74 | 67.40 | 68.61 | 83.24 | ||||||||||||
1947 | 62.26 | 76.21 | 76.77 | 83.17 | 93.61 | 100.13 | o | 107.06 | 100.26 | 101.17 | 87.23 | 68.03 | 61.10 | 83.35 | a | |||||||||||
1948 | 67.74 | 66.76 | h | 68.19 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 67.97 | j | ||
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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1960 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1961 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 66.15 | r | ----- | z |
1962 | 65.41 | b | 67.21 | 69.07 | a | 90.55 | a | 89.94 | 101.03 | 105.61 | 107.84 | 98.43 | 88.26 | 78.38 | a | 69.29 | 85.92 | |||||||||
1963 | 62.81 | 75.70 | a | 74.61 | 80.59 | a | 95.84 | 98.70 | 107.14 | b | 99.97 | 101.43 | w | 89.27 | a | 72.67 | 67.87 | 84.11 | a | |||||||
1964 | 61.39 | 66.38 | 70.68 | 81.90 | 91.00 | 99.80 | 106.57 | a | 100.39 | 95.96 | b | 91.16 | 69.77 | 63.71 | 83.22 | |||||||||||
1965 | 65.39 | 67.75 | 69.16 | 78.50 | 89.00 | 95.57 | 105.42 | 104.67 | a | 94.53 | 92.84 | 75.20 | 62.73 | a | 83.40 | |||||||||||
1966 | 61.23 | 62.65 | b | 77.07 | d | 87.57 | 96.65 | 102.68 | h | 106.74 | 105.13 | 97.23 | 87.70 | a | 75.37 | ----- | z | 85.73 | b | |||||||
1967 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1968 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1969 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1970 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1971 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1972 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1973 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1974 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1975 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1976 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1977 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1978 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1979 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1980 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1981 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1982 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1983 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1984 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1985 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1986 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1987 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1988 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1989 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1990 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1991 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1992 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1993 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1994 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1995 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1996 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1997 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1998 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1999 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2000 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2001 | ----- | z | ----- | z | 74.74 | 81.52 | a | 98.55 | 103.37 | 102.90 | 103.39 | 101.40 | 89.00 | 75.33 | 62.03 | 89.22 | b | |||||||||
2002 | 65.45 | 72.25 | 74.58 | 85.97 | 92.26 | 104.50 | 105.03 | 104.00 | a | 97.57 | 82.39 | 75.63 | 62.74 | 85.20 | ||||||||||||
2003 | 73.39 | 65.82 | 72.17 | a | 77.73 | 92.35 | 100.82 | h | 106.93 | a | 101.60 | a | 98.50 | 91.97 | 69.03 | 65.42 | 83.17 | a | ||||||||
2004 | 64.97 | 64.00 | 83.42 | 81.67 | 93.00 | 100.57 | 104.00 | 101.74 | 96.60 | 81.11 | c | 66.47 | 62.58 | 83.34 | ||||||||||||
2005 | 62.58 | 63.79 | 70.23 | 81.37 | 92.52 | 99.80 | 107.35 | 101.13 | 98.27 | 86.32 | 77.03 | 68.29 | 84.06 | |||||||||||||
2006 | 68.67 | a | 72.96 | 69.39 | 82.27 | 95.48 | 105.47 | 105.97 | 101.39 | 90.63 | 81.84 | 75.50 | 63.52 | 84.42 | ||||||||||||
2007 | 61.03 | 67.46 | 77.23 | 81.27 | 90.13 | 99.53 | 103.94 | 102.48 | 95.47 | 84.10 | 76.30 | 57.03 | 83.00 | |||||||||||||
2008 | 57.48 | 63.55 | 74.29 | 82.80 | 87.53 | a | 103.30 | 103.39 | 103.03 | 97.47 | 86.29 | 74.17 | 59.77 | 82.76 | ||||||||||||
2009 | 65.52 | 67.07 | 76.74 | 81.83 | 97.35 | 97.70 | 109.29 | 105.87 | 100.17 | 83.84 | 77.87 | 61.87 | 85.43 | |||||||||||||
2010 | 65.26 | 65.71 | 70.58 | 79.50 | 88.71 | 101.47 | 104.65 | 102.00 | 101.47 | 85.61 | 71.43 | 67.16 | 83.63 | |||||||||||||
2011 | 65.58 | 63.61 | 77.48 | 83.10 | 88.29 | 100.87 | 104.52 | 106.87 | 100.50 | 89.52 | 71.17 | 60.10 | 84.30 | |||||||||||||
2012 | 69.00 | 69.10 | 75.94 | 84.97 | 95.23 | 103.37 | 101.48 | 103.29 | 97.17 | 88.81 | 79.57 | 63.77 | 85.97 | |||||||||||||
2013 | 62.61 | 65.18 | 79.06 | 85.23 | 93.06 | 105.93 | 104.32 | 103.19 | 96.23 | 84.61 | 74.93 | 64.19 | 84.88 | |||||||||||||
2014 | 70.52 | 73.75 | 78.68 | 85.23 | 92.87 | 103.60 | 105.23 | 98.87 | 95.90 | 89.03 | 75.83 | 64.26 | 86.15 | |||||||||||||
2015 | 67.45 | 75.29 | 81.48 | 83.63 | 86.03 | 103.43 | 101.94 | 105.19 | 98.00 | 86.45 | 70.73 | 63.52 | 85.26 | |||||||||||||
2016 | 64.03 | 77.69 | 80.35 | 83.33 | 88.84 | 105.20 | 106.58 | 101.23 | 95.03 | 90.74 | 75.90 | 66.26 | 86.27 | |||||||||||||
2017 | 60.97 | 68.81 | a | 80.32 | 86.57 | 92.00 | 105.67 | 104.65 | 103.58 | 96.20 | 91.81 | 80.93 | 71.03 | 86.88 | ||||||||||||
2018 | 72.06 | 68.86 | 75.94 | 87.40 | 92.35 | 102.33 | 105.77 | 103.00 | 101.57 | 79.87 | 73.33 | 64.81 | 85.61 | |||||||||||||
2019 | 65.16 | 60.30 | a | 73.94 | 85.00 | 84.81 | 101.17 | 105.87 | 106.45 | 96.30 | 86.19 | 75.80 | 62.55 | 83.63 | ||||||||||||
2020 | 66.94 | 68.10 | 70.13 | 81.81 | c | 101.32 | 103.88 | v | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 77.66 | g | ||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 64.26 | 67.46 | 74.26 | 82.86 | 91.90 | 101.24 | 105.27 | 102.81 | 97.59 | 86.68 | 74.26 | 64.85 | 84.41 | |||||||||||||
S.D. | 4.17 | 4.60 | 4.40 | 3.55 | 4.06 | 3.00 | 1.67 | 2.28 | 2.51 | 3.35 | 3.85 | 3.45 | 1.40 | |||||||||||||
SKEW | -0.53 | 0.42 | 0.37 | -0.37 | 0.04 | -0.45 | -0.07 | 0.07 | -0.29 | -0.15 | -0.35 | -0.02 | 0.05 | |||||||||||||
MAX | 73.39 | 77.69 | 84.74 | 90.55 | 101.32 | 105.93 | 109.29 | 107.84 | 101.57 | 92.84 | 80.93 | 71.55 | 87.40 | |||||||||||||
MIN | 51.26 | 58.25 | 67.81 | 72.93 | 84.23 | 94.00 | 101.48 | 98.35 | 90.63 | 79.74 | 66.30 | 57.03 | 81.84 | |||||||||||||
YRS | 43 | 42 | 44 | 43 | 42 | 39 | 42 | 42 | 41 | 42 | 42 | 41 | 36 |