YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 105.45 | 104.74 | 101.93 | 88.84 | 73.20 | 64.35 | 89.75 | f | ||||||
1949 | 54.61 | 66.89 | 75.52 | 86.50 | 92.32 | 100.43 | 102.48 | 102.61 | 99.67 | 84.65 | 83.30 | 67.29 | 84.69 | |||||||||||||
1950 | 65.19 | 74.46 | 79.39 | 90.10 | 93.16 | 102.53 | 101.65 | 105.19 | 97.50 | 94.77 | 81.20 | 74.58 | 88.31 | |||||||||||||
1951 | 66.87 | 69.82 | 75.00 | 82.47 | 93.29 | 100.63 | 106.61 | 99.03 | 101.23 | 89.06 | 73.67 | 64.97 | 85.22 | |||||||||||||
1952 | 64.77 | 69.52 | 68.97 | 82.10 | 96.87 | 102.43 | 104.03 | 104.52 | 101.30 | 96.48 | 70.93 | 64.81 | 85.56 | |||||||||||||
1953 | 71.55 | 70.93 | 78.00 | 82.97 | 86.90 | 102.40 | 104.23 | 104.06 | 104.17 | 89.55 | 78.73 | 66.42 | 86.66 | |||||||||||||
1954 | 67.97 | 79.04 | 74.61 | 90.60 | 96.13 | 100.87 | 104.19 | 101.00 | 100.57 | 91.68 | 81.17 | 68.35 | 88.01 | |||||||||||||
1955 | 60.23 | 66.68 | 77.77 | 82.97 | 91.29 | 100.77 | 100.48 | 98.94 | 101.13 | 93.35 | 75.87 | 71.74 | 85.10 | |||||||||||||
1956 | 71.26 | 66.41 | 81.84 | 83.25 | b | 96.84 | 105.37 | 104.58 | 103.71 | 104.03 | 88.81 | 76.53 | 69.94 | 87.71 | ||||||||||||
1957 | 63.81 | 74.96 | 77.29 | 83.47 | 88.74 | 104.33 | 106.03 | 102.13 | 100.53 | 83.35 | 70.10 | 70.10 | 85.40 | |||||||||||||
1958 | 68.94 | 72.25 | 70.10 | 83.80 | 99.52 | 103.57 | 107.77 | 103.77 | 98.77 | 89.58 | 76.33 | 74.39 | 87.40 | |||||||||||||
1959 | 71.16 | 68.32 | 80.45 | 90.00 | 92.29 | 105.73 | 108.16 | 100.55 | 98.87 | 88.97 | 76.87 | 65.77 | 87.26 | |||||||||||||
1960 | 61.84 | 66.03 | 81.26 | 88.03 | 95.06 | 107.70 | 107.48 | 104.29 | 101.97 | 84.84 | 77.97 | 67.19 | 86.97 | |||||||||||||
1961 | 70.61 | 74.68 | 77.45 | 87.67 | 93.77 | 106.17 | 105.52 | 102.29 | 95.93 | 88.10 | 72.53 | 65.42 | 86.68 | |||||||||||||
1962 | 65.55 | 69.75 | 72.81 | 91.63 | 91.81 | 102.57 | 105.16 | 107.26 | 98.67 | 90.13 | 80.63 | 70.39 | 87.20 | |||||||||||||
1963 | 64.39 | 77.25 | 77.48 | 81.73 | 97.16 | 99.60 | 107.19 | 100.48 | 100.57 | 91.74 | 76.07 | 70.13 | 86.98 | |||||||||||||
1964 | 64.52 | 68.31 | 73.48 | 83.20 | 93.03 | 101.87 | 106.61 | 100.90 | 96.23 | 92.32 | 71.83 | 66.58 | 84.91 | |||||||||||||
1965 | 67.94 | 70.43 | 72.68 | 81.50 | 90.55 | 96.90 | 105.68 | 105.00 | 95.83 | 93.32 | 76.90 | 65.42 | 85.18 | |||||||||||||
1966 | 62.94 | 65.00 | 79.35 | 88.27 | 97.65 | 103.67 | 106.74 | 104.23 | 97.30 | 89.19 | 78.33 | 68.35 | 86.75 | |||||||||||||
1967 | 68.61 | 75.04 | 80.29 | 79.10 | 93.10 | 99.10 | 104.93 | a | 104.48 | 99.33 | 92.65 | 80.62 | a | 61.00 | 86.52 | |||||||||||
1968 | 67.42 | 74.21 | 75.52 | 82.87 | 93.77 | 103.73 | 103.77 | 100.00 | 100.63 | 90.16 | 74.87 | 65.35 | 86.03 | |||||||||||||
1969 | 68.10 | 68.79 | 74.26 | 86.93 | 97.87 | 101.10 | 106.55 | 106.73 | a | 99.93 | 84.58 | 74.60 | 66.94 | 86.36 | ||||||||||||
1970 | 67.06 | 75.36 | 74.10 | 81.50 | 97.55 | 104.31 | a | 107.94 | 104.57 | a | 95.33 | 84.90 | a | 77.53 | 66.71 | 86.40 | ||||||||||
1971 | 69.16 | 72.07 | 81.23 | 84.17 | 89.48 | 102.77 | 108.13 | 100.94 | 99.00 | 82.35 | 75.36 | b | 63.13 | a | 85.65 | |||||||||||
1972 | 68.74 | 77.41 | 88.61 | 87.90 | 95.14 | b | 101.97 | 108.39 | 103.30 | a | 99.70 | c | 82.70 | a | 69.44 | e | 63.42 | 87.23 | ||||||||
1973 | 62.26 | 69.08 | c | 66.78 | d | 81.96 | b | 96.58 | 104.78 | c | 105.10 | 104.75 | c | 99.30 | 91.29 | 75.37 | 69.84 | 85.59 | ||||||||
1974 | 66.03 | a | 72.04 | a | 78.16 | 86.30 | 96.33 | a | 108.53 | 103.42 | 103.97 | 98.00 | 87.26 | 74.93 | 63.19 | 86.51 | ||||||||||
1975 | 66.13 | 69.57 | 72.55 | 76.87 | 91.48 | 101.63 | 104.65 | 104.77 | 99.10 | a | 87.97 | 76.70 | 67.87 | a | 84.94 | |||||||||||
1976 | 68.44 | d | 73.07 | 75.06 | 82.10 | 94.06 | 102.93 | 102.81 | 103.94 | 94.03 | 83.55 | 76.57 | 68.48 | 85.42 | ||||||||||||
1977 | 65.13 | 75.68 | 72.84 | 86.97 | 87.68 | 103.93 | 104.87 | 102.77 | 97.37 | 90.32 | 78.70 | 70.45 | 86.39 | |||||||||||||
1978 | 64.29 | 67.46 | 75.74 | 81.67 | 92.97 | 104.53 | 105.26 | 102.42 | 96.37 | 90.81 | 71.77 | 62.10 | 84.61 | |||||||||||||
1979 | 58.58 | 68.32 | 71.77 | 84.57 | 90.03 | 102.47 | 105.77 | 100.26 | 101.67 | 90.81 | 73.17 | 70.39 | 84.82 | |||||||||||||
1980 | 66.33 | a | 71.34 | 71.74 | 83.30 | 87.58 | 103.63 | 106.48 | 101.23 | 98.53 | 88.55 | 78.30 | 74.81 | 85.99 | ||||||||||||
1981 | 70.53 | a | 73.89 | 74.29 | 87.70 | 90.93 | a | 103.77 | 103.48 | 103.94 | 98.97 | 84.58 | 78.67 | 70.42 | 86.76 | |||||||||||
1982 | 64.87 | 71.14 | 72.96 | c | 83.00 | 90.65 | 98.60 | 101.90 | 101.16 | 95.20 | 86.13 | 71.13 | 63.32 | 83.34 | ||||||||||||
1983 | 67.60 | a | 68.11 | 71.87 | 77.20 | 92.52 | 99.53 | 103.48 | 99.71 | 98.35 | d | 85.71 | 73.17 | 66.52 | 83.65 | |||||||||||
1984 | 67.58 | 72.03 | 79.97 | 80.70 | 97.74 | 98.70 | 99.00 | 100.58 | 96.15 | c | 81.97 | 73.13 | 61.81 | 84.11 | ||||||||||||
1985 | 62.74 | 68.30 | a | 72.81 | 87.93 | a | 93.89 | c | 103.10 | 103.35 | 102.45 | 92.33 | 85.42 | 71.87 | 66.94 | 84.26 | ||||||||||
1986 | 73.42 | 71.39 | 80.35 | 86.03 | 94.23 | 103.73 | 101.13 | 104.13 | 94.53 | 85.10 | 75.67 | 66.97 | 86.39 | |||||||||||||
1987 | 65.47 | a | 68.68 | 73.00 | 88.87 | g | 91.27 | a | 102.57 | 102.55 | 99.58 | 95.40 | 90.00 | 73.20 | 62.03 | 83.98 | a | |||||||||
1988 | 64.55 | 73.48 | 78.03 | 83.20 | 91.29 | 102.87 | 103.90 | 99.97 | 96.87 | 92.52 | 74.47 | 66.39 | 85.63 | |||||||||||||
1989 | 65.42 | 73.82 | 82.48 | 93.90 | 97.65 | 106.13 | 109.55 | 105.03 | 102.40 | 89.71 | 79.37 | 69.94 | 89.62 | |||||||||||||
1990 | 67.42 | 69.04 | 79.84 | 88.80 | 94.06 | 107.93 | 104.52 | 100.97 | 97.80 | 91.29 | 77.70 | 64.32 | 86.97 | |||||||||||||
1991 | 65.84 | 78.36 | 70.19 | 85.57 | 93.68 | 101.40 | 106.58 | 105.70 | a | 99.90 | 92.48 | 74.63 | 66.23 | 86.71 | ||||||||||||
1992 | 65.71 | 71.45 | 74.39 | 90.57 | 95.45 | 102.73 | 102.81 | 101.68 | 100.20 | 89.77 | 71.70 | 61.39 | 85.65 | |||||||||||||
1993 | 65.13 | 66.39 | 77.45 | 88.13 | 98.29 | 103.60 | 102.97 | 101.13 | 98.77 | 86.90 | 71.60 | 66.50 | a | 85.57 | ||||||||||||
1994 | 68.81 | 69.96 | 79.42 | 88.60 | 95.84 | 110.33 | 109.84 | 110.13 | 102.50 | 88.00 | 71.07 | 66.35 | 88.40 | |||||||||||||
1995 | 64.83 | a | 76.00 | 78.90 | 85.10 | 92.55 | 103.80 | 111.26 | 109.26 | 103.93 | 93.55 | 80.23 | 70.35 | 89.15 | ||||||||||||
1996 | 70.84 | 76.21 | 80.48 | 90.53 | 100.13 | 109.20 | 109.52 | 108.35 | 97.47 | 88.84 | 78.57 | 70.06 | 90.02 | |||||||||||||
1997 | 66.37 | a | 71.54 | 85.97 | 84.90 | a | 102.00 | 103.30 | 108.90 | 105.81 | 102.27 | 88.84 | 77.50 | 64.06 | 88.45 | |||||||||||
1998 | 68.13 | 64.18 | 74.74 | 80.83 | 93.48 | 104.33 | 109.70 | a | 109.03 | b | 102.00 | 89.67 | a | 75.90 | 66.77 | 86.56 | ||||||||||
1999 | 71.00 | 75.46 | 81.58 | 82.17 | a | 96.61 | 104.27 | 104.10 | 106.71 | 101.20 | 94.45 | 83.30 | 68.63 | a | 89.12 | |||||||||||
2000 | 71.00 | a | 74.28 | 77.90 | b | 92.47 | 102.33 | a | 106.47 | 109.94 | 106.57 | a | 104.73 | 84.83 | b | 67.23 | 69.52 | 88.94 | ||||||||
2001 | 64.65 | 68.39 | 79.48 | 87.00 | 103.61 | 108.10 | 107.58 | 108.00 | 105.70 | 92.23 | 78.50 | 63.68 | 88.91 | |||||||||||||
2002 | 66.84 | 74.89 | 78.61 | 91.03 | a | 97.42 | 109.13 | 109.07 | a | 107.94 | 102.27 | 86.42 | 77.60 | 65.33 | a | 88.88 | ||||||||||
2003 | 74.19 | 69.07 | a | 76.19 | 84.89 | b | 97.81 | 106.60 | 109.87 | a | 105.31 | b | 102.70 | 95.37 | a | 72.60 | 68.13 | 88.56 | ||||||||
2004 | 67.61 | 67.79 | 86.16 | 87.37 | 99.23 | 107.07 | 107.94 | 106.00 | 100.97 | 86.68 | 70.13 | 65.39 | 87.69 | |||||||||||||
2005 | 65.94 | 66.57 | 74.55 | 87.57 | 98.03 | 106.33 | 111.74 | 104.77 | a | ----- | z | 90.06 | 78.47 | 69.23 | 86.66 | a | ||||||||||
2006 | 70.65 | 75.68 | 73.16 | 87.33 | 101.45 | 111.34 | a | 109.42 | 106.42 | 98.73 | 87.90 | 79.23 | 64.81 | 88.84 | ||||||||||||
2007 | 64.40 | a | 72.52 | a | 82.71 | 87.90 | 98.29 | 108.21 | a | 108.06 | 108.03 | 103.13 | 90.16 | 81.43 | 61.42 | 88.86 | ||||||||||
2008 | 63.32 | 69.03 | 80.65 | 88.53 | 92.43 | a | 107.80 | 105.73 | e | 103.94 | 101.21 | b | 91.90 | a | 78.57 | 64.30 | d | 87.28 | ||||||||
2009 | 69.13 | a | 72.50 | 80.88 | e | 85.73 | 99.90 | a | 101.83 | a | 110.23 | 107.26 | 101.73 | 86.23 | 79.40 | 62.90 | 88.14 | |||||||||
2010 | 67.10 | 68.36 | 73.70 | a | 84.47 | 93.06 | 105.37 | 107.29 | 105.03 | 104.40 | 88.13 | a | 75.07 | 70.39 | 86.86 | |||||||||||
2011 | 66.74 | 67.78 | a | 80.84 | 86.63 | 93.29 | 105.33 | 107.23 | 109.19 | 103.30 | 91.10 | 73.23 | 61.74 | 87.20 | ||||||||||||
2012 | 70.00 | 72.17 | 79.87 | 88.93 | 99.26 | 107.23 | 105.45 | 105.52 | 99.57 | 91.10 | 80.10 | 65.32 | 88.71 | |||||||||||||
2013 | 63.32 | 67.33 | a | 82.26 | 88.17 | 96.55 | 108.60 | 106.03 | 105.90 | 99.00 | 86.32 | 75.83 | 65.53 | a | 87.07 | |||||||||||
2014 | 71.16 | 76.21 | 80.52 | 87.77 | 94.45 | 106.10 | 106.84 | 101.31 | b | 98.18 | b | 88.00 | e | 76.63 | 65.68 | 87.74 | ||||||||||
2015 | 67.90 | a | 76.64 | 84.00 | 87.79 | b | 90.57 | c | 106.30 | 105.89 | c | 108.03 | b | 100.77 | 88.87 | 71.90 | 63.69 | b | 87.70 | |||||||
2016 | 65.27 | a | 78.24 | 83.16 | 87.03 | 94.20 | a | 108.97 | 109.10 | 104.29 | 98.57 | 94.26 | 77.20 | 67.83 | a | 89.01 | ||||||||||
2017 | 63.54 | c | 73.20 | c | 85.93 | b | 90.70 | 96.16 | 108.67 | 105.48 | 105.84 | 99.40 | 92.93 | c | 83.70 | 72.26 | d | 89.82 | ||||||||
2018 | 72.87 | a | 70.92 | b | 77.74 | h | 90.35 | d | 97.96 | c | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 83.03 | h |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 66.75 | 71.45 | 77.41 | 85.84 | 94.83 | 104.24 | 105.99 | 104.05 | 99.64 | 89.06 | 76.00 | 66.80 | 86.85 | |||||||||||||
S.D. | 3.41 | 3.62 | 4.46 | 3.60 | 3.64 | 3.09 | 2.69 | 2.79 | 2.79 | 3.34 | 3.60 | 3.25 | 1.58 | |||||||||||||
SKEW | -0.50 | 0.17 | 0.10 | -0.21 | 0.10 | 0.07 | -0.11 | 0.08 | -0.17 | -0.10 | -0.03 | 0.36 | -0.03 | |||||||||||||
MAX | 74.19 | 79.04 | 88.61 | 93.90 | 103.61 | 111.34 | 111.74 | 110.13 | 105.70 | 96.48 | 83.70 | 74.81 | 90.02 | |||||||||||||
MIN | 54.61 | 64.18 | 66.78 | 76.87 | 86.90 | 96.90 | 99.00 | 98.94 | 92.33 | 81.97 | 67.23 | 61.00 | 83.34 | |||||||||||||
YRS | 70 | 70 | 69 | 69 | 70 | 69 | 70 | 70 | 69 | 70 | 70 | 70 | 67 |