YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1949 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 52.81 | 49.53 | 51.52 | 51.29 | i | |||
1950 | 50.07 | c | 51.32 | 49.61 | 51.43 | 51.83 | a | 53.87 | 53.97 | 55.10 | 53.76 | a | 53.26 | 52.83 | 50.77 | 52.32 | ||||||||||
1951 | 49.65 | 50.29 | 52.65 | 49.67 | 50.20 | k | 52.27 | 54.13 | 54.39 | 52.80 | 54.39 | 51.23 | 50.00 | 51.95 | a | |||||||||||
1952 | 49.19 | 49.21 | 50.68 | 49.62 | a | 51.58 | 53.80 | 54.61 | 54.65 | 53.40 | 54.71 | 53.77 | 50.45 | 52.14 | ||||||||||||
1953 | 48.16 | 49.64 | 50.03 | 50.87 | 53.10 | 53.67 | 54.35 | 54.74 | 53.60 | 53.35 | 52.17 | 51.06 | 52.06 | |||||||||||||
1954 | 48.61 | 49.79 | 49.74 | 52.33 | 54.73 | a | 54.70 | 55.03 | 56.87 | 55.23 | 54.29 | 52.43 | 51.58 | 52.95 | ||||||||||||
1955 | 49.16 | 50.29 | 48.77 | 50.83 | 52.23 | 52.10 | 52.26 | 53.10 | 52.63 | 53.06 | 52.67 | 51.23 | 51.53 | |||||||||||||
1956 | 51.84 | 50.48 | ----- | z | 51.27 | 52.87 | 53.17 | 53.81 | 55.97 | 54.10 | 55.10 | 53.30 | 51.68 | 53.05 | a | |||||||||||
1957 | 50.97 | 47.61 | 47.32 | 51.33 | 51.87 | 53.27 | 55.52 | 56.42 | 56.13 | 55.10 | 54.30 | 53.03 | 52.74 | |||||||||||||
1958 | 46.68 | 47.82 | 49.29 | 50.93 | 52.58 | 53.63 | 55.61 | 57.35 | 55.13 | 54.55 | 54.37 | 49.45 | 52.28 | |||||||||||||
1959 | 52.68 | 50.43 | 50.58 | 53.23 | 53.19 | 53.93 | 55.35 | 56.48 | 56.13 | 54.29 | 53.46 | b | 50.86 | c | 53.39 | |||||||||||
1960 | 47.94 | 48.55 | 50.81 | 52.30 | 52.77 | 54.20 | 54.48 | 55.84 | 54.69 | a | 54.45 | 52.23 | 49.63 | a | 52.32 | |||||||||||
1961 | 49.35 | 50.57 | 48.94 | 50.07 | 51.94 | 52.27 | 53.06 | 53.84 | 52.77 | 54.42 | 52.33 | 49.32 | 51.57 | |||||||||||||
1962 | 49.10 | 47.57 | 49.26 | 51.27 | 52.29 | 52.17 | 53.52 | 52.65 | 53.20 | 51.68 | 51.13 | 48.93 | a | 51.06 | ||||||||||||
1963 | 50.72 | b | 53.44 | c | 54.00 | 53.63 | 52.90 | 53.76 | a | 54.81 | 55.21 | b | 55.97 | 54.68 | 52.37 | 51.55 | 53.59 | |||||||||
1964 | 50.80 | a | 49.66 | 51.39 | 51.50 | 52.35 | 54.43 | 54.87 | 54.71 | 55.10 | 54.23 | 52.60 | 53.61 | 52.94 | ||||||||||||
1965 | 51.29 | 46.25 | 48.65 | 52.67 | 54.94 | 53.77 | 54.61 | 54.84 | 54.90 | 54.16 | 55.33 | 50.90 | 52.69 | |||||||||||||
1966 | 49.58 | 50.36 | 50.74 | 50.40 | 53.52 | 53.97 | 54.87 | a | 55.71 | 55.90 | 55.32 | 53.73 | 52.65 | 53.06 | ||||||||||||
1967 | 48.06 | 50.36 | 52.10 | 51.80 | 53.71 | 54.63 | 56.29 | 55.84 | 55.50 | 55.23 | 53.52 | a | 52.61 | 53.30 | ||||||||||||
1968 | 49.52 | b | 51.68 | a | 52.40 | a | 52.67 | 53.61 | 55.33 | 56.00 | 55.77 | 56.53 | 55.61 | 53.93 | 53.16 | 53.85 | ||||||||||
1969 | 50.10 | 52.04 | 50.52 | 52.10 | 53.00 | a | 54.10 | 56.10 | 56.20 | a | 55.13 | 54.29 | 52.70 | 50.77 | 53.09 | |||||||||||
1970 | 51.42 | 48.36 | 49.23 | 52.00 | a | 53.96 | c | 54.60 | 55.06 | 55.62 | b | 54.66 | a | 54.94 | 54.23 | 51.65 | 52.98 | |||||||||
1971 | 51.35 | 50.04 | 50.74 | 52.87 | 51.16 | 52.97 | 54.42 | 53.19 | 54.11 | b | 52.97 | 53.07 | 50.35 | 52.27 | ||||||||||||
1972 | 49.47 | a | 49.26 | f | 50.83 | b | 52.28 | a | 51.52 | b | 53.64 | b | 54.52 | 55.94 | 55.10 | a | 55.13 | 53.33 | 51.55 | 53.03 | a | |||||
1973 | 50.65 | 47.61 | 50.94 | 50.53 | 50.94 | 53.13 | 54.94 | 54.73 | a | 53.75 | b | 54.13 | a | 53.39 | b | 50.87 | a | 52.13 | ||||||||
1974 | 52.61 | 50.56 | a | 52.20 | a | 53.00 | a | 52.81 | 54.00 | b | 53.73 | a | 55.45 | 53.83 | a | 54.58 | 51.97 | 51.27 | a | 53.00 | ||||||
1975 | 49.76 | b | 49.96 | 49.61 | 50.30 | 49.65 | 51.67 | 52.39 | c | 53.67 | a | 52.57 | b | 53.48 | 52.14 | a | 50.16 | 51.28 | ||||||||
1976 | 49.90 | 49.52 | 50.97 | 49.47 | 50.52 | 51.37 | 52.63 | a | 53.20 | a | 54.10 | 53.07 | a | 51.60 | 49.96 | c | 51.36 | |||||||||
1977 | 47.84 | 49.11 | a | 51.06 | 52.77 | 51.60 | a | 52.97 | a | 55.00 | j | 50.73 | a | ----- | z | 54.77 | a | 50.87 | 47.87 | a | 50.96 | b | ||||
1978 | 47.55 | b | 45.50 | f | 50.03 | 51.92 | d | 54.29 | 54.83 | 56.39 | 57.35 | 55.45 | a | 55.30 | a | 54.21 | b | 50.43 | a | 53.43 | a | |||||
1979 | 48.71 | g | 51.60 | c | 49.54 | e | 52.40 | e | 52.54 | c | 53.66 | a | 54.55 | b | 55.03 | 54.67 | 56.06 | 53.23 | 50.93 | a | 53.11 | a | ||||
1980 | 48.26 | 51.70 | b | 52.68 | 52.77 | d | 53.81 | 54.57 | 56.06 | 54.48 | 55.63 | 54.00 | 51.97 | 51.77 | 53.14 | |||||||||||
1981 | 48.48 | 48.93 | 47.97 | 49.67 | 52.17 | a | 53.50 | 53.48 | 55.87 | 53.77 | 52.53 | a | 52.13 | 50.43 | a | 51.58 | ||||||||||
1982 | 49.58 | 49.00 | a | 49.76 | b | 50.57 | 50.97 | a | 54.87 | 56.19 | 56.55 | 54.83 | 53.58 | 53.90 | 50.97 | 52.56 | ||||||||||
1983 | 46.39 | c | 46.04 | b | 45.13 | a | 49.41 | a | 49.48 | 50.26 | c | 52.65 | 53.67 | a | 53.97 | 52.52 | 50.41 | a | 49.29 | 49.94 | ||||||
1984 | 48.63 | a | 49.31 | 50.53 | a | 52.40 | 52.65 | 54.10 | 54.39 | 54.32 | 53.86 | a | 55.16 | 53.77 | 50.71 | 52.49 | ||||||||||
1985 | 47.57 | c | 50.46 | d | 49.31 | b | 50.62 | a | 50.00 | n | 52.83 | a | 55.61 | 55.93 | a | 54.90 | 55.29 | 51.73 | 50.26 | 52.23 | a | |||||
1986 | 49.63 | a | 50.15 | b | 52.14 | b | 52.89 | b | 52.86 | c | 54.08 | d | 56.83 | b | 57.14 | b | 57.11 | c | 54.93 | a | 55.41 | a | 51.23 | a | 53.70 | |
1987 | 49.71 | c | 45.78 | a | 47.00 | f | 50.71 | b | 50.56 | d | 53.76 | a | 55.87 | 55.62 | b | 56.85 | c | 55.65 | 54.00 | c | 53.55 | 52.91 | a | |||
1988 | 51.35 | 50.93 | a | 50.14 | b | 50.85 | d | 54.43 | c | 54.53 | 54.29 | 54.63 | a | 55.38 | a | 54.97 | 55.23 | d | 52.26 | 53.25 | ||||||
1989 | 51.03 | a | 50.15 | a | 51.90 | a | 51.60 | 54.55 | 54.73 | d | 56.41 | b | 54.77 | 54.77 | 56.61 | c | 52.36 | b | 49.00 | c | 53.16 | |||||
1990 | 52.74 | 49.50 | d | 50.03 | b | 51.50 | b | 52.86 | c | 55.07 | a | 56.06 | 56.26 | 56.90 | 56.06 | 56.79 | a | 51.90 | a | 53.81 | ||||||
1991 | 48.71 | 50.00 | 50.71 | 51.13 | 52.32 | 53.14 | a | 54.86 | b | 57.58 | 55.50 | 54.17 | a | 54.93 | c | 52.26 | 52.94 | |||||||||
1992 | 47.68 | 48.17 | 48.97 | 49.82 | h | 53.95 | i | 55.41 | a | 56.16 | 57.27 | a | 58.40 | 56.38 | e | 55.48 | i | 53.32 | 53.53 | c | ||||||
1993 | 49.32 | c | 47.81 | a | 49.74 | 51.70 | 51.52 | 54.37 | 55.61 | 55.90 | a | 55.23 | d | 55.77 | a | 52.48 | a | 50.90 | a | 52.53 | ||||||
1994 | 47.84 | 52.18 | 49.94 | 52.10 | 52.45 | 55.03 | 57.48 | 57.26 | 56.73 | 54.97 | 55.41 | a | 50.48 | 53.49 | ||||||||||||
1995 | 46.94 | 48.18 | 50.52 | 52.10 | 53.10 | 54.10 | 55.61 | 56.00 | a | 54.17 | 55.19 | 54.40 | 51.52 | 52.65 | ||||||||||||
1996 | 52.07 | a | 50.11 | a | 51.03 | 53.50 | 55.42 | 55.83 | 56.39 | 55.55 | 56.13 | 55.58 | 56.17 | 52.71 | 54.21 | |||||||||||
1997 | 50.77 | a | 50.00 | a | 53.42 | 50.80 | 54.65 | 56.60 | 57.03 | a | 54.65 | 56.27 | 55.32 | 53.20 | 50.55 | 53.60 | ||||||||||
1998 | 47.29 | 47.46 | 49.58 | 51.50 | 52.19 | 54.43 | 54.03 | 55.19 | 55.00 | 54.77 | 53.97 | 50.61 | 52.17 | |||||||||||||
1999 | 49.33 | a | 49.82 | 50.16 | 50.40 | 52.17 | a | 53.00 | 52.81 | 54.50 | c | 53.66 | a | 53.61 | 52.10 | 51.43 | a | 51.92 | ||||||||
2000 | 48.68 | 47.76 | 49.20 | a | 50.67 | 51.77 | 52.48 | a | 55.96 | c | 56.50 | a | 55.03 | 55.32 | 53.55 | a | 50.40 | a | 52.28 | |||||||
2001 | 48.93 | a | 49.16 | c | 49.70 | a | 52.43 | 52.16 | 53.87 | 54.70 | a | 56.06 | 55.62 | a | 54.77 | a | 55.00 | a | 51.67 | a | 52.84 | |||||
2002 | 50.97 | 48.85 | a | 49.38 | b | 53.26 | c | 53.46 | c | 52.71 | b | 56.74 | d | 56.79 | b | 55.62 | a | 55.79 | c | 52.24 | m | 46.29 | x | 53.36 | b | |
2003 | 48.93 | q | 49.08 | o | 50.46 | c | 52.71 | b | 52.32 | 54.62 | a | 56.84 | 56.58 | 55.20 | 54.00 | 53.87 | 52.60 | a | 53.92 | b | ||||||
2004 | 51.59 | i | 52.19 | c | 52.75 | c | 52.60 | 54.96 | c | 55.30 | 55.03 | b | 56.42 | 54.87 | 56.19 | 54.38 | a | 51.67 | a | 54.22 | a | |||||
2005 | 50.79 | c | 49.44 | c | 51.90 | 52.50 | 54.07 | b | 55.03 | a | 56.84 | 55.31 | b | 57.45 | a | 54.81 | 53.67 | 50.03 | a | 53.49 | ||||||
2006 | 51.57 | a | 49.00 | b | 53.42 | 50.69 | a | 51.87 | 53.33 | 55.23 | 56.06 | 55.37 | 55.57 | a | 55.03 | 51.97 | a | 53.26 | ||||||||
2007 | 50.55 | 49.42 | b | 50.77 | 50.11 | b | 51.45 | 54.07 | 55.42 | 54.61 | 55.82 | b | 54.10 | a | 53.10 | 52.97 | b | 52.70 | ||||||||
2008 | 48.10 | b | 49.31 | 50.83 | a | 51.82 | b | 54.97 | a | 53.67 | 54.66 | b | 54.39 | 53.57 | b | 53.90 | 53.43 | b | 52.45 | b | 52.59 | |||||
2009 | 49.23 | a | 49.10 | g | 50.53 | a | 51.32 | b | 53.03 | b | 54.41 | a | 55.77 | a | 57.10 | 54.73 | 56.89 | d | 54.22 | c | 50.90 | a | 53.47 | a | ||
2010 | 48.62 | e | 47.89 | a | 49.66 | b | 50.92 | d | 53.00 | a | 53.78 | c | 53.76 | b | 54.55 | 52.96 | e | 53.48 | b | 52.50 | 51.83 | b | 51.91 | |||
2011 | 51.57 | h | 51.15 | a | 51.45 | b | 50.41 | a | 54.10 | a | 53.76 | a | 52.58 | e | 55.00 | b | 52.52 | a | 52.19 | 52.54 | d | 51.45 | b | 52.47 | a | |
2012 | 49.31 | e | 49.15 | c | 47.97 | a | 46.33 | r | 50.36 | c | 52.62 | f | 52.90 | a | 53.41 | b | 52.25 | b | 52.18 | c | 50.25 | f | 50.26 | d | 50.87 | c |
2013 | 48.69 | b | 48.19 | b | 47.77 | 49.56 | c | 53.61 | c | 52.34 | a | 54.30 | d | 54.21 | c | 53.81 | c | 53.75 | s | 51.62 | f | 48.90 | k | 51.39 | c | |
2014 | 45.44 | o | 49.92 | o | 49.63 | l | 51.65 | m | 51.35 | n | 52.06 | m | 54.82 | n | 54.12 | n | 53.76 | m | 55.15 | r | ----- | z | ----- | z | ----- | z |
2015 | ----- | z | 47.00 | s | 48.50 | o | 50.85 | q | 51.20 | u | 52.43 | w | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 49.55 | 49.52 | 50.36 | 51.49 | 52.68 | 53.80 | 54.93 | 55.32 | 54.84 | 54.53 | 53.27 | 51.16 | 52.63 | |||||||||||||
S.D. | 1.53 | 1.54 | 1.56 | 1.11 | 1.33 | 1.11 | 1.28 | 1.32 | 1.31 | 1.13 | 1.39 | 1.19 | 0.83 | |||||||||||||
SKEW | 0.16 | -0.12 | -0.26 | -0.08 | -0.11 | -0.48 | -0.25 | -0.69 | 0.15 | -0.38 | -0.03 | -0.09 | -0.72 | |||||||||||||
MAX | 52.74 | 53.44 | 54.00 | 53.63 | 55.42 | 56.60 | 57.48 | 57.58 | 58.40 | 56.89 | 56.79 | 53.61 | 54.21 | |||||||||||||
MIN | 46.39 | 45.78 | 45.13 | 49.41 | 49.48 | 50.26 | 52.26 | 50.73 | 52.25 | 51.68 | 49.53 | 47.87 | 49.94 | |||||||||||||
YRS | 60 | 60 | 62 | 62 | 61 | 63 | 63 | 64 | 63 | 64 | 61 | 63 | 48 |