YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1967 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 60.50 | 59.50 | a | 52.90 | a | 48.27 | 41.75 | a | 52.58 | g | ||
1968 | 42.15 | 48.26 | 47.27 | 46.25 | 52.71 | 55.62 | 58.71 | b | 58.65 | 57.81 | a | 50.95 | a | 47.55 | 40.47 | 50.53 | ||||||||||
1969 | 35.73 | 41.23 | 45.06 | 47.25 | 52.70 | c | 58.88 | a | 57.47 | 57.66 | 56.20 | 50.63 | a | 46.20 | 44.92 | 49.49 | ||||||||||
1970 | 42.48 | 46.52 | a | 45.11 | 45.50 | 50.75 | a | 54.14 | b | 56.37 | 57.23 | a | 54.48 | a | 51.07 | b | 46.89 | b | 41.08 | a | 49.30 | |||||
1971 | 41.13 | a | 42.54 | b | 42.32 | a | 46.75 | 51.29 | 53.34 | a | 56.76 | 59.56 | 55.12 | a | 49.10 | 45.53 | a | 39.81 | 48.60 | |||||||
1972 | 38.56 | 42.12 | 45.16 | 44.78 | a | 51.95 | 55.20 | 58.53 | b | 58.03 | a | 53.14 | b | 49.15 | 46.58 | 38.05 | a | 48.44 | ||||||||
1973 | 39.97 | a | 44.25 | 44.02 | 47.95 | 51.48 | 54.53 | a | 56.42 | 54.87 | 56.70 | 50.57 | a | 44.08 | 45.81 | 49.22 | ||||||||||
1974 | 39.03 | 42.09 | 44.13 | a | 47.83 | 49.60 | 54.53 | 56.75 | a | 58.71 | 59.33 | 50.08 | 46.85 | 45.40 | 49.53 | |||||||||||
1975 | 41.85 | 41.67 | a | 43.32 | 43.50 | 50.12 | a | 53.55 | 57.85 | a | 57.87 | 58.12 | a | 50.58 | a | 46.16 | a | 43.53 | 49.01 | |||||||
1976 | 42.82 | 42.60 | 42.28 | a | 46.67 | 51.03 | 53.07 | 57.94 | 57.66 | 58.17 | 52.45 | a | 46.85 | f | 43.65 | a | 49.85 | a | ||||||||
1977 | 40.17 | a | 46.27 | 44.23 | 47.80 | 50.10 | 54.93 | a | 56.77 | 60.10 | a | 55.37 | 50.29 | 44.87 | 43.46 | c | 49.53 | |||||||||
1978 | 44.90 | 45.61 | 46.31 | 48.25 | 50.74 | 57.81 | a | 58.21 | 58.48 | a | 56.62 | 53.27 | 41.30 | 37.87 | 49.95 | |||||||||||
1979 | 35.50 | 41.16 | 46.71 | 48.60 | 52.52 | 54.57 | 58.87 | a | 59.60 | 60.15 | 53.79 | 45.83 | 46.53 | 50.32 | ||||||||||||
1980 | 37.94 | 45.05 | 45.08 | 49.08 | 50.29 | c | 54.57 | a | 58.27 | a | 56.42 | 56.23 | 52.58 | a | 47.53 | a | 44.98 | 49.84 | ||||||||
1981 | 46.58 | 44.25 | 47.55 | a | 48.16 | a | 52.08 | 56.30 | 58.13 | 60.03 | a | 57.28 | 50.32 | 47.75 | 43.84 | 51.02 | ||||||||||
1982 | 39.13 | h | 41.87 | b | 44.17 | a | 45.91 | c | 51.30 | c | 55.09 | h | 58.64 | c | 58.47 | b | 58.24 | a | 53.76 | h | 44.39 | c | 41.46 | e | 49.38 | c |
1983 | 46.98 | i | 47.90 | g | 48.85 | g | 48.89 | b | 53.48 | 56.81 | a | 59.62 | b | 59.85 | a | 54.91 | b | 48.68 | c | 48.24 | c | 38.05 | b | 52.06 | c | |
1984 | 43.41 | c | 44.85 | b | 48.00 | c | 46.45 | 50.18 | a | 54.40 | 57.24 | 57.37 | 56.65 | 49.35 | 46.19 | a | 39.18 | 49.44 | ||||||||
1985 | 40.15 | 39.88 | 42.44 | 47.45 | 50.98 | a | 54.03 | a | 58.24 | 57.89 | 54.48 | 49.45 | 38.98 | 39.79 | 47.81 | |||||||||||
1986 | 46.65 | 43.75 | 49.37 | 47.63 | 51.94 | 57.05 | 58.02 | 58.87 | 54.78 | 53.69 | 47.03 | 44.34 | 51.09 | |||||||||||||
1987 | 43.37 | 46.96 | 47.76 | 49.98 | 53.77 | 55.60 | 58.00 | 59.13 | 57.18 | 53.42 | 50.00 | 40.66 | 51.32 | |||||||||||||
1988 | 42.26 | 45.12 | a | 45.81 | 49.32 | 51.61 | 54.67 | 57.83 | a | 58.23 | a | 55.00 | 54.40 | 47.43 | 43.60 | 50.44 | ||||||||||
1989 | 41.69 | 36.54 | 44.58 | a | 50.57 | 52.82 | a | 56.78 | c | 58.69 | 59.34 | 58.88 | 52.43 | a | 47.73 | 43.86 | b | 50.33 | ||||||||
1990 | 44.47 | a | 41.61 | a | 47.11 | 50.05 | 52.38 | a | 55.70 | b | 60.17 | a | 61.15 | a | 60.24 | a | 51.43 | a | 47.53 | a | 37.02 | 50.74 | ||||
1991 | 40.77 | a | 48.11 | 43.87 | 47.40 | 51.32 | 54.40 | a | 58.63 | 59.08 | 60.48 | 50.57 | a | 47.52 | a | 44.95 | 50.59 | |||||||||
1992 | 45.60 | 48.41 | 49.52 | a | 51.20 | 54.48 | 57.93 | 60.68 | 60.15 | a | 55.45 | 52.89 | 46.38 | a | 40.27 | a | 51.91 | |||||||||
1993 | 37.52 | e | 42.41 | 47.68 | 49.62 | b | 56.17 | b | 57.87 | 59.74 | 59.71 | c | 56.93 | a | 52.73 | c | 41.38 | b | 43.45 | c | 50.43 | |||||
1994 | 45.35 | d | 42.11 | a | 48.81 | b | 50.45 | 53.72 | a | 56.17 | a | 59.18 | 61.05 | a | 59.63 | 49.58 | g | 42.91 | a | 42.81 | b | 51.11 | a | |||
1995 | 47.84 | b | 46.31 | a | 46.55 | 49.17 | c | 53.95 | b | 56.31 | d | 61.43 | c | 58.27 | a | 61.80 | c | 53.11 | d | 50.69 | a | 46.30 | a | 52.64 | ||
1996 | 42.82 | c | 44.07 | a | 47.60 | b | 51.14 | a | 52.44 | 55.55 | a | 59.45 | a | 59.17 | b | 57.67 | a | 51.84 | b | 45.48 | a | 42.05 | c | 50.77 | ||
1997 | 42.98 | 44.02 | 44.73 | a | 47.48 | 55.58 | a | 57.05 | 60.35 | 62.37 | a | 60.93 | b | 52.39 | 49.57 | c | 44.13 | a | 51.80 | |||||||
1998 | 44.84 | c | 46.37 | a | 47.05 | b | 48.05 | a | 53.52 | a | 56.65 | 60.35 | 60.52 | a | 57.12 | a | 52.64 | c | 47.88 | 40.90 | a | 51.32 | ||||
1999 | 43.07 | b | 43.25 | b | 43.82 | a | 46.12 | a | 50.10 | a | 55.84 | a | 57.11 | 59.90 | b | 55.98 | c | 50.98 | b | 49.38 | 45.52 | a | 50.09 | |||
2000 | 40.98 | b | 44.12 | a | 44.52 | 49.90 | 52.47 | b | 56.42 | 58.76 | 59.11 | 57.34 | a | 52.72 | a | 43.33 | d | 43.32 | a | 50.25 | ||||||
2001 | 43.98 | 41.63 | a | 45.27 | 46.34 | b | 51.16 | b | 54.15 | 57.26 | b | 58.84 | 55.95 | 50.53 | b | 47.46 | c | 43.27 | a | 49.65 | ||||||
2002 | 42.39 | c | 43.26 | c | 43.33 | a | 48.25 | 50.47 | b | 56.23 | d | 59.77 | a | 58.63 | d | 57.93 | 51.03 | a | 48.58 | e | 45.52 | 50.45 | ||||
2003 | 48.35 | 44.02 | 47.71 | 48.40 | a | 52.03 | b | 56.93 | b | 60.08 | 59.69 | 57.93 | 55.60 | a | 43.98 | a | 44.53 | a | 51.61 | |||||||
2004 | 43.90 | 45.72 | 47.58 | 51.18 | 54.69 | 58.02 | b | 61.87 | a | 62.47 | a | 57.80 | 53.56 | 45.90 | 44.87 | 52.30 | ||||||||||
2005 | 44.73 | a | 44.94 | a | 47.68 | c | 48.53 | 53.84 | b | 55.48 | b | 58.53 | 58.24 | 52.97 | 51.71 | 43.84 | a | 41.93 | a | 50.20 | ||||||
2006 | 44.33 | b | 41.62 | 43.10 | 47.30 | 50.85 | a | 56.12 | d | 57.89 | 55.59 | b | 56.68 | 50.10 | a | 45.38 | b | 43.40 | 49.36 | |||||||
2007 | 39.94 | 44.24 | a | 45.29 | b | 48.10 | a | 51.67 | b | 54.77 | 60.47 | b | 59.58 | a | 56.60 | a | 49.38 | c | 43.82 | 41.73 | 49.63 | |||||
2008 | 39.47 | b | 42.74 | 42.58 | 44.53 | 51.60 | a | 53.08 | 56.71 | 58.66 | 55.88 | 50.05 | 49.22 | 39.00 | 48.63 | |||||||||||
2009 | 41.31 | 41.12 | 42.31 | 46.10 | 53.14 | x | 57.13 | 58.83 | b | 59.98 | 58.23 | 51.02 | 46.83 | 38.85 | 49.25 | a | ||||||||||
2010 | 47.12 | a | 46.18 | 46.69 | 47.70 | 50.98 | 54.78 | 56.70 | a | 57.83 | a | 57.87 | 52.10 | 44.55 | 43.71 | 50.52 | ||||||||||
2011 | 41.92 | 39.70 | 44.47 | 44.93 | 50.15 | 56.08 | 58.34 | 59.61 | 57.33 | 51.47 | 42.13 | 39.74 | 48.82 | |||||||||||||
2012 | 41.37 | 43.86 | 42.89 | 48.37 | 50.90 | 54.77 | 58.32 | 59.65 | a | 56.52 | 51.16 | 47.27 | 42.92 | 49.83 | ||||||||||||
2013 | 38.97 | 43.14 | 45.21 | 47.92 | 52.90 | a | 57.67 | 58.65 | 60.06 | 59.42 | 50.39 | 46.00 | 37.47 | 49.82 | ||||||||||||
2014 | 43.13 | 41.00 | 47.08 | 49.55 | 55.43 | b | 56.97 | 59.48 | a | 60.42 | 60.93 | 56.44 | 47.03 | 46.08 | 51.96 | |||||||||||
2015 | 45.63 | 49.66 | 48.45 | 48.75 | 53.47 | 57.25 | 62.29 | 62.10 | 57.03 | 56.27 | 45.68 | 44.27 | 52.57 | |||||||||||||
2016 | 46.29 | 49.34 | 48.38 | a | 52.16 | b | 55.03 | 57.38 | a | 60.68 | 60.38 | a | 57.08 | 53.05 | 51.48 | 39.00 | 52.52 | |||||||||
2017 | 35.94 | 40.46 | 45.74 | 49.86 | l | 52.47 | a | 57.36 | a | 58.90 | 59.77 | a | 56.42 | 49.56 | g | 45.41 | c | 41.54 | e | 49.40 | b | |||||
2018 | 46.68 | c | 40.63 | e | 44.25 | a | 47.95 | b | 53.94 | 56.98 | 59.74 | 61.26 | 56.70 | 52.53 | 48.48 | 44.82 | 51.16 | |||||||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 42.41 | 43.73 | 45.60 | 48.02 | 52.22 | 55.83 | 58.70 | 59.19 | 57.25 | 51.77 | 46.28 | 42.41 | 50.33 | |||||||||||||
S.D. | 3.15 | 2.68 | 2.03 | 1.85 | 1.63 | 1.44 | 1.41 | 1.51 | 1.95 | 1.81 | 2.45 | 2.60 | 1.17 | |||||||||||||
SKEW | -0.28 | 0.12 | 0.07 | -0.09 | 0.54 | -0.07 | 0.44 | -0.31 | 0.18 | 0.59 | -0.56 | -0.40 | 0.20 | |||||||||||||
MAX | 48.35 | 49.66 | 49.52 | 52.16 | 56.17 | 58.88 | 62.29 | 62.47 | 61.80 | 56.44 | 51.48 | 46.53 | 52.64 | |||||||||||||
MIN | 35.50 | 36.54 | 42.28 | 43.50 | 49.60 | 53.07 | 56.37 | 54.87 | 52.97 | 48.68 | 38.98 | 37.02 | 47.81 | |||||||||||||
YRS | 49 | 50 | 50 | 50 | 50 | 50 | 51 | 52 | 52 | 49 | 51 | 52 | 45 |