YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1958 | ----- | z | ----- | z | ----- | z | ----- | z | 71.13 | 73.47 | 70.97 | 73.97 | 81.83 | 75.94 | 70.87 | 70.71 | 73.61 | d | ||||||||
1959 | 63.39 | 62.29 | 70.03 | 69.40 | 68.84 | 70.80 | 71.83 | a | 75.06 | 72.50 | 77.94 | 74.69 | a | 67.68 | 70.37 | |||||||||||
1960 | 58.19 | 62.48 | 67.10 | 68.97 | 69.23 | 71.86 | a | 71.52 | 70.61 | 72.87 | 72.55 | 65.73 | 63.77 | 67.91 | ||||||||||||
1961 | 68.87 | 64.86 | 63.19 | 68.62 | a | 66.16 | 71.93 | 73.35 | 72.19 | 75.97 | 74.16 | 66.73 | 60.94 | 68.92 | ||||||||||||
1962 | 64.23 | a | 59.25 | 60.97 | a | 68.50 | 67.03 | 68.77 | 66.45 | 75.06 | 70.03 | 74.81 | 71.13 | 65.52 | 67.65 | |||||||||||
1963 | 60.77 | 67.82 | 63.19 | 63.37 | 66.58 | 68.47 | 72.23 | 72.90 | 77.93 | 74.06 | 66.63 | 65.65 | 68.30 | |||||||||||||
1964 | 60.80 | a | 67.45 | 63.42 | 64.83 | a | 64.68 | 70.03 | 71.84 | 72.74 | 74.27 | 75.35 | 64.27 | 60.29 | 67.50 | |||||||||||
1965 | 62.48 | 62.89 | 63.39 | 66.57 | 66.58 | 67.10 | 70.00 | 75.26 | 73.77 | 78.43 | a | 66.43 | 58.32 | 67.60 | ||||||||||||
1966 | 60.74 | 59.96 | 64.77 | 69.93 | 66.84 | 72.03 | 71.17 | a | 72.35 | 76.50 | 76.19 | 66.73 | 62.00 | 68.27 | ||||||||||||
1967 | 64.06 | 67.11 | 63.29 | 59.37 | 71.19 | 66.30 | 72.67 | a | 72.13 | 77.20 | 80.35 | 70.23 | 60.84 | 68.73 | ||||||||||||
1968 | 62.58 | 66.38 | 67.55 | 68.40 | 68.68 | 71.60 | 71.37 | a | 80.00 | l | 76.63 | 71.84 | 64.00 | 57.84 | 67.90 | a | ||||||||||
1969 | 60.29 | 57.68 | 66.16 | 66.00 | 68.87 | 70.33 | 71.26 | 73.03 | 73.60 | 73.35 | 73.13 | 63.35 | 68.09 | |||||||||||||
1970 | 61.81 | 68.50 | 69.19 | 66.10 | 70.53 | a | 70.30 | 75.43 | x | ----- | z | 80.10 | a | 71.03 | 67.63 | 59.16 | 68.44 | b | ||||||||
1971 | 63.79 | b | 63.00 | 65.61 | 63.20 | 64.74 | 71.32 | b | 70.35 | 74.41 | b | 78.37 | 70.58 | 65.53 | 56.81 | 67.31 | ||||||||||
1972 | 61.13 | 65.72 | 68.43 | a | 67.57 | 68.71 | 69.25 | j | 73.26 | 72.87 | 72.70 | 71.45 | 63.90 | 57.74 | 67.59 | a | ||||||||||
1973 | 58.32 | 63.82 | 60.03 | 67.37 | 67.16 | 73.10 | a | 69.43 | a | 68.94 | 72.63 | 72.13 | 61.72 | a | 60.68 | 66.28 | ||||||||||
1974 | 58.84 | 63.79 | 62.87 | 66.03 | 65.35 | 67.77 | 70.19 | 70.00 | 71.23 | 74.07 | b | 67.40 | 60.68 | 66.52 | ||||||||||||
1975 | 64.65 | 62.86 | 63.53 | a | 62.13 | 68.83 | a | 67.70 | j | 71.55 | 72.68 | 72.83 | 70.35 | 67.20 | 65.86 | b | 67.50 | a | ||||||||
1976 | 69.10 | 63.90 | 64.19 | 65.17 | 67.16 | 72.22 | c | 70.23 | a | 74.16 | 73.33 | 75.20 | a | 73.60 | 68.94 | 69.77 | ||||||||||
1977 | 62.06 | 67.86 | 62.55 | 68.43 | 64.42 | 68.79 | b | 72.29 | j | 72.21 | c | 72.69 | a | 70.84 | 68.10 | 62.32 | 67.30 | a | ||||||||
1978 | 58.71 | 60.11 | a | 65.33 | a | 61.76 | a | 72.08 | e | ----- | z | 71.74 | 71.97 | 78.20 | 72.35 | 63.87 | ----- | z | 67.61 | b | ||||||
1979 | 57.50 | e | 58.47 | k | 63.77 | i | 66.54 | b | 69.55 | 70.07 | b | 71.42 | 71.39 | 77.20 | 73.34 | b | 65.80 | 64.79 | c | 68.76 | b | |||||
1980 | 62.50 | a | 65.89 | a | 64.32 | 67.97 | 64.58 | 68.93 | 71.81 | 69.84 | 73.83 | 73.58 | 70.80 | 67.39 | 68.45 | |||||||||||
1981 | 65.94 | 65.30 | a | 62.84 | 67.79 | a | 66.13 | 77.85 | j | 69.71 | j | 71.68 | 72.66 | a | 71.77 | 68.07 | 62.33 | a | 67.45 | b | ||||||
1982 | 58.60 | a | 65.50 | d | 61.45 | b | 67.20 | ----- | z | 66.22 | c | 69.71 | 71.93 | d | 74.69 | d | 74.80 | a | 65.14 | b | 60.97 | b | 66.93 | a | ||
1983 | 63.52 | 63.81 | a | 63.45 | b | 66.87 | 69.69 | b | 71.07 | b | 74.73 | e | 76.86 | b | 80.56 | c | 77.28 | b | 68.08 | d | 63.27 | a | 69.93 | |||
1984 | 64.86 | b | 66.76 | d | 70.41 | b | 66.50 | b | 71.76 | f | 67.11 | c | 71.23 | a | 74.42 | 81.71 | b | 70.59 | b | 63.67 | c | 59.45 | 68.79 | a | ||
1985 | 60.62 | b | 64.31 | b | 60.00 | c | 68.07 | c | 64.48 | 71.68 | b | 70.96 | f | 71.70 | a | 73.79 | a | 72.67 | g | 60.08 | f | 66.31 | b | 66.77 | c | |
1986 | 67.19 | e | 66.00 | d | 69.77 | e | 66.96 | b | 70.54 | e | 70.90 | a | 70.76 | b | 72.07 | a | 69.54 | b | 73.17 | b | 72.79 | b | 66.24 | b | 69.66 | |
1987 | 62.12 | f | 67.12 | d | 68.18 | c | ----- | z | 70.17 | b | ----- | z | 70.10 | b | 72.03 | a | 74.50 | b | 75.07 | c | 67.70 | 60.75 | c | 69.51 | c | |
1988 | 63.48 | d | 71.43 | a | 70.97 | 71.00 | f | 69.85 | d | 71.00 | b | 73.32 | 73.16 | 74.10 | a | 72.67 | a | 67.72 | a | 66.44 | d | 70.38 | a | |||
1989 | 64.06 | 62.46 | 67.10 | a | 70.26 | c | 68.39 | c | 71.13 | 69.13 | ----- | z | 71.04 | c | 71.50 | a | 70.17 | 66.84 | 68.37 | a | ||||||
1990 | 60.50 | a | 59.92 | b | 62.87 | 69.57 | b | ----- | z | 71.00 | 69.64 | c | 71.26 | 72.87 | 74.28 | b | 69.27 | 59.61 | 67.34 | a | ||||||
1991 | 61.77 | 67.21 | 59.86 | c | 65.00 | 63.74 | 65.33 | 68.19 | 72.29 | 72.66 | a | 73.27 | a | 70.23 | 64.53 | a | 67.01 | |||||||||
1992 | 63.90 | 66.36 | a | 65.42 | 72.37 | 70.03 | 69.50 | 73.21 | b | 73.17 | a | 73.50 | 75.58 | 69.77 | 60.61 | c | 69.45 | |||||||||
1993 | 59.48 | 60.74 | a | 67.84 | 68.17 | a | 72.31 | b | 73.97 | a | 70.68 | c | 75.36 | c | 73.47 | 76.58 | 70.00 | 64.10 | 69.39 | |||||||
1994 | 66.57 | a | 62.62 | b | 68.83 | a | 66.59 | a | 66.62 | b | 71.00 | 68.19 | 73.48 | d | 73.55 | a | 74.23 | a | 63.37 | c | 59.94 | 67.92 | ||||
1995 | 60.77 | a | 66.07 | a | 66.07 | b | 67.67 | 65.55 | 71.39 | b | 75.53 | a | 74.32 | c | 75.79 | a | 76.25 | c | 74.00 | 64.26 | 69.81 | |||||
1996 | 64.50 | a | 65.56 | d | 69.07 | c | 73.63 | 73.19 | d | 72.67 | 74.33 | a | 73.03 | a | 75.07 | b | 75.70 | a | 67.64 | b | 63.17 | b | 70.63 | |||
1997 | 62.32 | c | 64.85 | b | 70.43 | c | 70.78 | c | 76.38 | b | 73.44 | c | 73.61 | c | 77.93 | c | 80.79 | b | 76.13 | a | 70.73 | d | 61.83 | a | 71.60 | |
1998 | 62.55 | b | 61.05 | h | 66.54 | e | 66.93 | a | 68.59 | d | 71.04 | b | 73.04 | d | 74.47 | a | 73.31 | d | 71.28 | b | 65.11 | b | 59.82 | c | 68.42 | a |
1999 | 64.04 | f | 62.08 | d | 60.68 | c | 65.04 | e | 63.60 | a | 66.62 | a | 69.48 | b | 71.79 | b | 71.50 | b | 74.33 | a | 66.93 | a | 65.50 | a | 67.05 | a |
2000 | 61.04 | d | 63.67 | e | 64.17 | a | 68.72 | a | 69.67 | d | 71.77 | d | 69.29 | 71.30 | a | 75.77 | d | 68.39 | c | 63.90 | 65.96 | c | 67.80 | |||
2001 | 60.86 | b | 61.35 | b | 64.63 | a | 62.70 | c | 72.90 | b | 72.85 | d | 69.06 | 70.90 | b | 71.37 | c | 71.75 | c | 66.79 | b | 59.54 | e | 67.06 | ||
2002 | 59.65 | e | 67.65 | b | 65.75 | c | 64.92 | d | 67.30 | d | 70.77 | d | 72.93 | a | 72.89 | d | 76.44 | e | 72.21 | b | 72.38 | d | 62.81 | d | 68.81 | |
2003 | 68.83 | b | 65.16 | c | 68.89 | d | 66.00 | b | 70.93 | b | 72.71 | f | 74.07 | a | 77.39 | c | 79.04 | b | 78.52 | d | 67.32 | b | 63.03 | b | 70.83 | a |
2004 | 61.03 | a | 61.57 | a | 72.72 | b | 69.93 | b | 70.10 | a | 70.03 | a | 72.28 | b | 73.83 | b | 78.36 | b | 70.86 | c | 65.79 | a | 63.93 | b | 69.20 | |
2005 | 62.07 | b | 65.42 | d | 69.35 | e | 66.96 | b | 70.10 | b | 69.36 | b | 71.45 | b | 70.57 | a | 71.62 | a | 72.17 | b | 71.00 | 63.37 | d | 68.62 | ||
2006 | 62.97 | b | 67.27 | b | 60.68 | c | 64.74 | c | 68.63 | a | 71.62 | a | 73.67 | a | 71.42 | 72.93 | b | 74.44 | d | 67.45 | a | 64.59 | d | 68.37 | ||
2007 | 61.76 | b | 62.80 | c | 69.04 | c | 66.16 | e | 67.10 | a | 69.26 | c | 71.17 | a | 72.77 | a | 75.08 | d | 71.60 | a | 68.55 | a | 59.53 | a | 67.90 | |
2008 | 59.81 | e | 62.24 | 65.25 | c | 67.00 | d | 67.52 | 70.85 | c | 70.96 | d | 72.41 | b | 75.83 | a | 77.39 | c | 70.69 | d | 61.29 | c | 68.44 | |||
2009 | 69.52 | d | 63.50 | b | 64.18 | c | 67.78 | c | 67.36 | c | 71.14 | b | 70.28 | b | 74.30 | d | 74.86 | a | 71.92 | e | 69.50 | b | 60.86 | c | 68.77 | |
2010 | 63.89 | c | 64.04 | c | 65.28 | b | 65.16 | e | 65.83 | a | 69.33 | c | 67.97 | 69.33 | a | 76.04 | d | 71.71 | 66.90 | 62.70 | a | 67.35 | ||||
2011 | 66.30 | a | 63.52 | c | 63.62 | r | 67.62 | d | 66.90 | b | 67.96 | b | 70.28 | b | 68.68 | 73.64 | e | 75.64 | c | 64.96 | b | 64.97 | 68.22 | a | ||
2012 | 66.55 | 65.43 | a | 66.73 | a | 67.33 | 67.61 | 69.97 | 68.38 | g | 70.59 | b | 69.28 | e | 74.24 | n | 70.56 | c | 59.65 | 67.37 | b | |||||
2013 | 64.16 | 62.93 | a | 67.03 | 68.73 | 70.97 | 74.00 | r | 70.52 | 72.87 | 76.10 | 72.10 | 69.20 | 67.16 | 69.25 | a | ||||||||||
2014 | 71.74 | 64.07 | 70.40 | a | 69.80 | 73.42 | 68.57 | 73.06 | 73.65 | 74.47 | 78.84 | 69.93 | 63.23 | 70.93 | ||||||||||||
2015 | 69.68 | 70.32 | 73.68 | 68.40 | 65.97 | 70.57 | 75.16 | 77.94 | 79.93 | 78.52 | 65.37 | 60.10 | 71.30 | |||||||||||||
2016 | 61.48 | 72.41 | 67.42 | 71.43 | 68.26 | 71.87 | 69.48 | 69.42 | 75.37 | 73.58 | e | 68.89 | c | 61.33 | v | 69.96 | a | |||||||||
2017 | 59.45 | 63.29 | 68.53 | a | 69.63 | 69.73 | a | 70.61 | b | 71.10 | k | 71.80 | f | 80.37 | 77.77 | a | 70.33 | 67.84 | 69.75 | b | ||||||
2018 | 64.52 | h | 67.36 | 66.31 | b | 67.00 | 65.96 | c | 70.60 | t | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 66.66 | h | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 62.92 | 64.58 | 65.88 | 67.17 | 68.35 | 70.32 | 71.32 | 72.77 | 74.96 | 74.00 | 68.07 | 62.89 | 68.66 | |||||||||||||
S.D. | 3.24 | 2.90 | 3.31 | 2.57 | 2.68 | 1.97 | 1.92 | 2.08 | 3.03 | 2.60 | 2.94 | 3.10 | 1.31 | |||||||||||||
SKEW | 0.72 | 0.23 | 0.12 | -0.37 | 0.44 | -0.58 | 0.03 | 0.46 | 0.50 | 0.36 | 0.16 | 0.25 | 0.43 | |||||||||||||
MAX | 71.74 | 72.41 | 73.68 | 73.63 | 76.38 | 73.97 | 75.53 | 77.94 | 81.83 | 80.35 | 74.69 | 70.71 | 71.60 | |||||||||||||
MIN | 57.50 | 57.68 | 59.86 | 59.37 | 63.60 | 65.33 | 66.45 | 68.68 | 69.28 | 68.39 | 61.72 | 56.81 | 66.28 | |||||||||||||
YRS | 57 | 58 | 58 | 58 | 58 | 53 | 54 | 56 | 60 | 58 | 59 | 58 | 36 |