YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1967 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 68.48 | 70.53 | 61.45 | 56.10 | 46.94 | 60.70 | g | |||||
1968 | 48.19 | 57.14 | 54.19 | 53.63 | 59.97 | 62.80 | 65.90 | b | 66.39 | 66.23 | 58.94 | 54.13 | 46.74 | 57.85 | ||||||||||||
1969 | 41.61 | 48.39 | 53.71 | 54.30 | 59.86 | c | 64.31 | a | 63.48 | 66.35 | 63.80 | 60.35 | 55.87 | 50.71 | 56.90 | |||||||||||
1970 | 47.68 | 56.46 | 53.48 | 51.70 | 58.23 | a | 60.54 | b | 63.29 | 63.65 | 64.30 | 59.94 | 53.60 | 47.45 | 56.69 | |||||||||||
1971 | 45.77 | 49.75 | 48.71 | 54.40 | 57.77 | 59.59 | a | 62.58 | 67.77 | 66.13 | 58.00 | 51.53 | 45.26 | 55.61 | ||||||||||||
1972 | 43.65 | 48.24 | 51.00 | 51.21 | a | 58.94 | 61.50 | 66.03 | b | 66.30 | a | 63.24 | a | 59.58 | 53.67 | 44.23 | 55.63 | |||||||||
1973 | 46.23 | a | 52.50 | 50.71 | 55.23 | 59.42 | 60.93 | 63.61 | 61.71 | 65.90 | 58.68 | 50.67 | 51.23 | 56.40 | ||||||||||||
1974 | 45.48 | 47.46 | 50.52 | 54.03 | 56.00 | 61.23 | 63.83 | a | 65.29 | 71.10 | 62.29 | 54.17 | 50.68 | 56.84 | ||||||||||||
1975 | 47.39 | 48.25 | 50.26 | 50.80 | 56.57 | a | 59.97 | 64.71 | 63.19 | 68.79 | a | 57.19 | 51.30 | 49.58 | 55.67 | |||||||||||
1976 | 49.61 | 49.52 | 48.71 | 54.40 | 58.39 | 59.27 | 64.87 | 65.06 | 67.00 | 62.68 | 58.60 | 52.03 | 57.51 | |||||||||||||
1977 | 50.03 | 54.11 | 50.39 | 55.50 | 56.97 | 60.90 | 64.06 | 66.48 | 63.53 | 60.32 | 51.13 | 49.84 | 56.94 | |||||||||||||
1978 | 50.42 | 51.18 | 54.52 | 55.10 | 57.97 | 65.38 | a | 65.06 | 64.50 | a | 64.00 | 64.45 | 50.77 | 45.48 | 57.40 | |||||||||||
1979 | 43.06 | 47.04 | 54.65 | 55.43 | 60.10 | 61.90 | 66.33 | a | 67.03 | 70.23 | 62.42 | 54.70 | 52.55 | 57.95 | ||||||||||||
1980 | 46.48 | 52.21 | 51.42 | 57.63 | 57.65 | 61.28 | a | 64.77 | a | 63.10 | 65.13 | 63.90 | 55.73 | 51.45 | 57.56 | |||||||||||
1981 | 55.74 | 53.00 | 56.94 | 55.60 | 59.16 | 62.90 | 64.58 | 67.77 | a | 67.10 | 60.58 | 55.53 | 50.65 | 59.13 | ||||||||||||
1982 | 45.90 | 48.68 | 51.61 | 53.90 | a | 57.81 | 60.28 | a | 64.10 | 66.48 | 67.73 | 62.68 | 52.86 | a | 49.81 | 56.82 | ||||||||||
1983 | 53.06 | 54.89 | 56.84 | 59.23 | 61.06 | 63.60 | 67.13 | 68.58 | 66.43 | 60.61 | 54.17 | 45.16 | 59.23 | |||||||||||||
1984 | 50.74 | 52.90 | 56.10 | 54.70 | 58.77 | 60.70 | 65.90 | 67.94 | 67.40 | 57.45 | 53.17 | 46.32 | 57.67 | |||||||||||||
1985 | 50.42 | 48.32 | 50.74 | 54.83 | 58.97 | a | 62.66 | a | 66.42 | 67.77 | 64.83 | 58.90 | 45.87 | 49.81 | 56.63 | |||||||||||
1986 | 52.81 | 50.36 | 56.58 | 55.20 | 59.45 | 64.43 | 63.65 | 66.29 | 63.60 | 62.13 | 53.77 | 50.81 | 58.26 | |||||||||||||
1987 | 49.58 | 54.14 | 55.26 | 58.63 | 61.35 | 63.17 | 64.19 | 66.45 | 66.70 | 65.71 | 56.23 | 47.32 | 59.06 | |||||||||||||
1988 | 48.71 | 52.93 | 53.90 | 56.40 | 59.52 | 62.27 | 65.20 | a | 65.83 | a | 64.30 | 61.71 | 52.97 | 50.29 | 57.84 | |||||||||||
1989 | 47.77 | 43.21 | 50.61 | 59.33 | 60.55 | 63.07 | c | 66.10 | 66.65 | 72.00 | 60.10 | a | 54.23 | 50.65 | 57.86 | |||||||||||
1990 | 50.10 | 48.07 | 54.77 | 56.50 | 58.94 | 62.18 | b | 67.32 | 68.47 | a | 68.77 | 59.17 | a | 53.50 | 43.06 | 57.57 | ||||||||||
1991 | 47.97 | 55.57 | 51.26 | 53.77 | 56.97 | 60.13 | 65.48 | 64.71 | 71.63 | 62.03 | a | 53.47 | 50.65 | 57.80 | ||||||||||||
1992 | 51.52 | 56.93 | 59.48 | 59.03 | 64.10 | 64.47 | 68.03 | 69.37 | a | 65.77 | 61.84 | 53.90 | 46.10 | 60.04 | ||||||||||||
1993 | 44.43 | c | 51.18 | 55.19 | 56.27 | 63.97 | a | 65.57 | 66.06 | 68.37 | a | 67.10 | 61.74 | 51.07 | 50.19 | 58.43 | ||||||||||
1994 | 53.03 | 49.32 | 57.16 | 57.50 | 62.71 | 63.97 | 66.13 | 70.39 | 68.70 | 60.52 | 50.20 | 49.13 | a | 59.06 | ||||||||||||
1995 | 52.90 | 54.04 | a | 55.61 | 56.63 | 60.52 | 62.61 | b | 68.73 | a | 67.42 | 70.50 | 62.32 | 57.13 | 52.27 | a | 60.06 | |||||||||
1996 | 49.17 | a | 52.83 | 56.81 | 57.60 | 60.23 | 62.83 | 67.90 | a | 67.87 | 67.13 | 61.55 | 51.60 | 48.31 | b | 58.65 | ||||||||||
1997 | 48.68 | 50.82 | 51.55 | 55.83 | 64.17 | a | 64.87 | 67.87 | 70.10 | 69.67 | 59.71 | 56.79 | a | 51.19 | 59.27 | |||||||||||
1998 | 50.47 | a | 52.50 | 54.43 | a | 56.97 | 59.03 | 61.53 | 65.39 | 68.16 | 66.43 | 61.61 | 52.33 | 46.23 | 57.92 | |||||||||||
1999 | 48.87 | 49.19 | a | 51.10 | 54.10 | a | 56.63 | a | 61.83 | 63.68 | 65.77 | 65.60 | 60.19 | 55.33 | 52.23 | 57.04 | ||||||||||
2000 | 47.42 | 51.31 | 52.26 | 58.20 | 58.87 | 63.53 | 65.03 | 65.97 | 66.13 | 60.61 | 51.60 | 50.55 | 57.62 | |||||||||||||
2001 | 50.87 | 51.50 | 53.45 | 53.87 | 58.59 | b | 61.77 | 63.80 | a | 65.94 | 63.57 | 59.17 | a | 54.33 | 49.03 | 57.16 | ||||||||||
2002 | 48.06 | 50.46 | 50.65 | 55.70 | 57.48 | 62.38 | a | 66.19 | 65.76 | b | 66.97 | 59.71 | 57.90 | 51.16 | 57.70 | |||||||||||
2003 | 55.19 | 52.54 | 53.42 | 55.23 | 59.19 | 63.11 | b | 67.61 | 67.35 | 67.53 | 62.97 | 51.53 | 50.23 | 58.83 | ||||||||||||
2004 | 49.45 | 53.00 | 55.35 | 61.13 | 61.71 | 64.68 | b | 68.97 | a | 68.61 | 66.10 | 60.52 | 53.93 | 51.42 | 59.57 | |||||||||||
2005 | 50.67 | a | 55.32 | 55.71 | 53.87 | 59.10 | b | 61.70 | 65.06 | 64.94 | 62.30 | 57.90 | 52.20 | 48.45 | 57.27 | |||||||||||
2006 | 49.45 | 49.46 | 49.71 | 54.10 | 58.83 | a | 61.93 | a | 64.87 | 61.41 | b | 65.83 | 58.87 | 50.97 | 49.45 | 56.24 | ||||||||||
2007 | 46.65 | 49.50 | 51.00 | 54.70 | 58.10 | 61.30 | 66.23 | a | 66.48 | 63.87 | 57.31 | b | 51.93 | 46.71 | 56.15 | |||||||||||
2008 | 45.48 | 49.17 | 49.13 | 51.93 | 56.50 | a | 58.27 | 62.48 | 64.35 | 65.27 | 58.81 | 55.03 | 44.61 | 55.09 | ||||||||||||
2009 | 48.87 | 49.68 | 48.94 | 53.57 | 61.71 | x | 63.20 | 65.21 | b | 66.10 | 67.90 | 58.23 | 52.30 | 46.13 | 56.37 | a | ||||||||||
2010 | 51.60 | a | 53.43 | 54.35 | 53.57 | 56.74 | 60.73 | 62.13 | a | 63.97 | a | 63.80 | 60.52 | 50.10 | 47.84 | 56.57 | ||||||||||
2011 | 47.23 | 45.96 | 50.16 | 51.77 | 56.65 | 61.57 | 64.03 | 66.16 | 65.93 | 59.03 | 50.93 | 47.58 | 55.58 | |||||||||||||
2012 | 47.48 | 49.00 | 48.32 | 54.83 | 57.77 | 60.70 | 63.13 | 66.50 | a | 65.57 | 59.00 | 53.03 | 46.90 | 56.02 | ||||||||||||
2013 | 45.81 | 48.46 | 50.94 | 54.17 | 58.67 | a | 63.70 | 64.10 | 65.97 | 65.87 | 60.26 | 53.57 | 43.90 | 56.28 | ||||||||||||
2014 | 50.71 | 46.64 | 53.03 | 56.03 | 62.03 | b | 62.10 | 65.60 | a | 66.45 | 69.43 | 62.97 | 53.70 | 51.10 | 58.32 | |||||||||||
2015 | 53.06 | 56.75 | 56.90 | 56.97 | 58.39 | 63.70 | 69.55 | 69.71 | 66.00 | 64.00 | 53.43 | 49.00 | 59.79 | |||||||||||||
2016 | 50.48 | 54.97 | 54.33 | a | 59.61 | b | 61.71 | 64.66 | a | 65.71 | 67.60 | a | 65.63 | 58.81 | 55.67 | 45.42 | 58.72 | |||||||||
2017 | 42.81 | 47.86 | 50.81 | 56.11 | l | 57.90 | a | 63.28 | a | 65.55 | 67.13 | a | 66.43 | 60.19 | 51.43 | b | 48.42 | 56.53 | a | |||||||
2018 | 51.13 | a | 45.54 | b | 53.23 | 55.00 | b | 60.87 | 64.73 | 66.94 | 68.32 | 67.33 | 63.16 | 57.30 | 51.81 | 58.78 | ||||||||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 48.82 | 51.01 | 52.94 | 55.39 | 59.22 | 62.35 | 65.38 | 66.51 | 66.59 | 60.63 | 53.40 | 48.73 | 57.61 | |||||||||||||
S.D. | 3.07 | 3.21 | 2.72 | 2.24 | 1.99 | 1.67 | 1.71 | 1.94 | 2.29 | 1.95 | 2.34 | 2.51 | 1.27 | |||||||||||||
SKEW | -0.12 | 0.04 | 0.21 | 0.32 | 0.78 | -0.11 | 0.38 | -0.46 | 0.52 | 0.35 | -0.23 | -0.43 | 0.06 | |||||||||||||
MAX | 55.74 | 57.14 | 59.48 | 61.13 | 64.17 | 65.57 | 69.55 | 70.39 | 72.00 | 65.71 | 58.60 | 52.55 | 60.06 | |||||||||||||
MIN | 41.61 | 43.21 | 48.32 | 50.80 | 56.00 | 58.27 | 62.13 | 61.41 | 62.30 | 57.19 | 45.87 | 43.06 | 55.09 | |||||||||||||
YRS | 51 | 51 | 51 | 50 | 50 | 51 | 51 | 52 | 52 | 52 | 52 | 52 | 49 |