| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1930 | 42.00 | p | 52.82 | 54.84 | 57.03 | 56.90 | 63.17 | 64.48 | 69.39 | 65.73 | 63.29 | 59.30 | 54.00 | 60.09 | ||||||||||||
| 1931 | 55.61 | 59.21 | 59.74 | 62.47 | 64.81 | 66.90 | 70.71 | 67.87 | 68.67 | 63.23 | 56.37 | 51.29 | 62.24 | |||||||||||||
| 1932 | 50.23 | 51.41 | 56.13 | 58.00 | 58.68 | 69.20 | 66.19 | 67.45 | 70.43 | 64.81 | 57.87 | 51.16 | 60.13 | |||||||||||||
| 1933 | 50.35 | 52.64 | 54.16 | 60.07 | 57.68 | 67.63 | 67.68 | 70.13 | 64.20 | ----- | z | ----- | z | 53.97 | 59.85 | |||||||||||
| 1934 | 53.45 | 60.82 | 60.68 | 61.03 | 64.97 | 64.20 | 65.84 | 66.23 | 66.37 | 62.97 | 56.50 | 53.10 | 61.35 | |||||||||||||
| 1935 | 49.39 | 56.29 | 50.10 | 57.47 | 58.52 | 66.13 | 65.71 | 68.13 | 67.77 | 59.10 | 52.27 | 53.52 | 58.70 | |||||||||||||
| 1936 | 52.10 | 48.07 | 50.87 | 57.63 | 62.52 | 66.37 | 68.97 | 70.52 | 68.07 | 65.97 | 58.13 | 50.65 | 59.99 | |||||||||||||
| 1937 | 40.52 | 48.64 | 55.10 | 53.40 | 59.26 | 64.70 | 65.45 | 66.97 | 65.60 | 66.94 | 56.33 | 52.55 | 57.95 | |||||||||||||
| 1938 | 52.13 | 52.11 | 53.26 | 58.17 | 59.06 | 61.27 | 64.52 | 64.97 | 66.93 | 63.58 | 55.23 | 51.84 | 58.59 | |||||||||||||
| 1939 | 49.23 | 46.68 | 52.45 | 57.67 | 61.68 | 60.83 | 64.84 | 70.77 | 67.30 | 61.87 | 58.87 | 55.29 | 58.96 | |||||||||||||
| 1940 | 54.68 | 54.00 | 55.58 | 60.00 | 64.13 | 65.37 | 67.90 | 69.65 | 68.80 | 64.68 | 54.90 | 54.42 | 61.17 | |||||||||||||
| 1941 | 55.10 | 58.29 | 61.19 | 60.73 | 64.55 | 66.47 | 70.29 | 66.03 | 66.17 | 62.71 | 58.97 | 51.81 | 61.86 | |||||||||||||
| 1942 | 52.97 | 52.57 | 54.65 | 57.83 | 61.35 | 64.23 | 71.84 | 71.39 | 69.70 | 65.48 | 55.90 | 53.10 | 60.92 | |||||||||||||
| 1943 | 49.19 | 58.43 | 54.97 | 58.90 | 58.87 | 63.27 | 65.39 | 67.84 | 68.13 | 63.55 | 59.13 | 54.19 | 60.16 | |||||||||||||
| 1944 | 54.65 | 53.03 | 54.42 | 57.93 | 62.81 | 64.23 | 66.77 | 69.03 | 68.27 | 67.23 | 56.63 | 54.61 | 60.80 | |||||||||||||
| 1945 | 53.90 | 52.36 | 51.97 | 54.30 | 60.74 | 63.93 | 67.19 | 65.42 | 66.03 | 61.77 | 52.53 | 51.81 | 58.50 | |||||||||||||
| 1946 | 51.19 | 51.11 | 52.29 | 54.53 | 62.42 | 63.10 | 69.13 | 66.48 | 68.63 | 59.19 | 55.50 | 52.52 | 58.84 | |||||||||||||
| 1947 | 48.81 | 56.82 | 58.68 | 61.37 | 64.29 | 65.83 | 69.77 | 69.23 | 70.37 | 62.65 | 55.83 | 56.00 | 61.64 | |||||||||||||
| 1948 | 55.52 | 49.62 | 54.52 | 54.07 | 61.87 | 67.87 | 67.97 | 68.77 | 70.73 | 64.87 | 53.13 | 47.87 | 59.73 | |||||||||||||
| 1949 | 44.77 | a | 49.07 | 55.70 | a | 58.77 | 63.67 | a | 63.27 | 66.16 | 69.65 | 71.20 | 60.87 | 61.60 | 50.74 | 59.62 | ||||||||||
| 1950 | 41.81 | 50.79 | 52.16 | 56.03 | a | 58.48 | 66.83 | 66.97 | 69.45 | 67.67 | 60.60 | a | 55.63 | 55.97 | 58.53 | |||||||||||
| 1951 | 50.23 | 52.30 | a | 51.87 | 59.13 | 61.48 | 64.53 | 68.03 | 67.87 | 68.63 | 62.55 | b | 58.90 | 49.32 | 59.57 | |||||||||||
| 1952 | 47.10 | 50.52 | 50.71 | 57.33 | 61.77 | 61.53 | 66.94 | 66.53 | a | 69.17 | 67.35 | 57.43 | 51.55 | 58.99 | ||||||||||||
| 1953 | 52.52 | 51.43 | 53.90 | 55.73 | 61.23 | 61.60 | 66.42 | 67.65 | 69.73 | 63.97 | a | 57.27 | 53.52 | 59.58 | ||||||||||||
| 1954 | 47.13 | 54.07 | 52.87 | 54.38 | a | 60.67 | a | 61.37 | 64.00 | 65.42 | 66.66 | a | 64.55 | 58.97 | 52.45 | 58.54 | ||||||||||
| 1955 | 49.77 | 50.00 | 48.37 | a | 52.73 | 57.77 | a | 63.00 | 63.87 | 66.71 | 67.34 | a | 61.59 | b | 50.38 | a | 49.97 | 56.79 | ||||||||
| 1956 | 50.00 | a | 46.55 | 51.03 | 57.87 | 62.13 | 62.97 | 68.06 | 67.77 | 68.17 | 60.32 | 56.77 | 50.74 | 58.53 | ||||||||||||
| 1957 | 45.23 | 52.64 | 55.23 | 57.33 | 62.35 | 66.57 | 68.45 | 69.37 | a | 75.63 | 65.39 | 58.97 | 53.42 | 60.88 | ||||||||||||
| 1958 | 54.58 | 58.07 | 55.29 | 58.40 | 63.26 | 68.33 | 69.35 | 69.48 | 69.50 | 65.16 | 54.40 | 56.19 | 61.84 | |||||||||||||
| 1959 | 50.71 | 50.57 | 53.23 | 58.77 | 62.97 | 64.73 | 67.84 | 66.23 | 64.77 | 63.00 | 57.70 | 52.26 | 59.40 | |||||||||||||
| 1960 | 48.81 | 52.17 | 53.26 | 56.90 | 59.29 | 62.53 | 64.90 | a | 66.19 | 68.00 | 62.74 | 54.83 | 53.19 | 58.57 | ||||||||||||
| 1961 | 56.61 | 53.57 | 53.52 | 55.07 | 60.35 | 66.37 | 70.06 | 67.48 | 65.53 | 62.10 | a | 54.73 | 50.00 | b | 59.62 | |||||||||||
| 1962 | 49.77 | 52.79 | 52.26 | 56.63 | 56.71 | 62.37 | 64.58 | 68.45 | 67.19 | c | 63.48 | 56.90 | a | 55.00 | 58.84 | |||||||||||
| 1963 | 48.55 | 59.68 | 54.10 | 56.60 | 62.81 | 62.63 | 66.41 | b | 66.45 | 70.03 | 62.65 | 55.30 | 54.26 | 59.96 | ||||||||||||
| 1964 | 50.29 | 52.03 | 51.71 | 54.40 | 58.71 | 63.03 | 65.55 | 66.90 | 66.54 | b | 66.48 | 53.87 | 47.65 | 58.10 | ||||||||||||
| 1965 | 50.77 | 51.25 | 59.42 | 57.27 | 57.68 | 62.17 | 66.58 | 68.65 | 66.70 | 64.68 | 57.53 | 49.45 | 59.35 | |||||||||||||
| 1966 | 50.61 | c | 51.96 | 53.06 | 58.53 | 59.10 | 66.23 | 65.68 | 68.10 | 69.33 | 63.06 | 56.87 | 52.32 | 59.57 | ||||||||||||
| 1967 | 50.77 | 52.46 | 51.65 | 54.57 | 60.29 | 64.23 | 69.00 | 69.84 | 73.17 | 63.81 | 58.17 | 48.42 | 59.70 | |||||||||||||
| 1968 | 50.35 | 59.83 | 56.19 | 55.37 | 61.10 | 64.37 | 67.52 | 67.71 | 68.53 | 61.55 | 56.27 | 47.87 | 59.72 | |||||||||||||
| 1969 | 43.52 | 50.54 | 56.06 | 56.00 | 65.16 | 65.73 | 65.87 | 67.55 | 65.50 | 63.10 | 59.03 | 53.61 | 59.31 | |||||||||||||
| 1970 | 51.03 | 60.18 | 56.48 | 54.53 | 60.90 | 65.23 | 65.68 | 65.74 | 67.50 | 64.03 | 56.97 | 49.61 | 59.82 | |||||||||||||
| 1971 | 48.10 | 52.39 | 51.45 | 56.93 | 59.77 | 62.67 | 65.55 | 70.77 | 69.43 | 61.81 | 53.83 | 48.29 | 58.42 | |||||||||||||
| 1972 | 45.87 | 51.59 | 54.81 | 54.57 | 62.10 | 64.87 | 71.13 | 69.61 | 66.50 | 64.45 | 55.50 | 46.61 | 58.97 | |||||||||||||
| 1973 | 48.84 | 57.25 | 53.68 | 57.83 | 62.16 | 63.90 | 66.29 | 64.84 | 70.30 | 61.35 | 51.87 | 53.52 | 59.32 | |||||||||||||
| 1974 | 47.23 | 50.36 | 54.03 | 56.83 | 58.52 | 63.03 | 65.81 | 66.94 | 74.07 | 63.65 | 55.93 | 53.19 | 59.13 | |||||||||||||
| 1975 | 48.87 | 50.61 | 52.35 | 53.93 | c | 60.94 | 61.67 | 67.55 | 65.97 | b | 75.03 | a | 58.71 | c | 52.96 | c | 51.42 | 58.33 | ||||||||
| 1976 | 52.87 | a | 51.07 | a | 51.07 | b | 57.43 | b | 62.64 | f | 63.09 | g | 68.00 | f | 67.56 | d | 70.79 | b | 65.48 | 61.21 | b | 54.82 | c | 59.14 | ||
| 1977 | 53.45 | b | 57.25 | 52.48 | 58.24 | a | 59.00 | b | 65.24 | a | 67.46 | c | 68.34 | b | 66.90 | 63.40 | a | 53.00 | b | 51.50 | a | 59.69 | ||||
| 1978 | 52.90 | 54.96 | b | 57.74 | l | 58.12 | f | 63.31 | b | 70.48 | c | 70.62 | g | 71.12 | e | 69.86 | i | 70.15 | d | 53.59 | c | 47.40 | a | 60.49 | ||
| 1979 | 46.83 | b | 50.74 | a | 59.70 | d | 59.33 | 64.10 | 65.70 | 71.24 | b | 70.20 | a | 73.31 | a | 65.64 | c | 58.18 | b | 53.34 | b | 61.53 | ||||
| 1980 | 48.33 | a | 55.68 | a | 55.04 | f | 61.07 | 61.52 | 63.75 | b | 70.06 | ----- | z | 69.92 | d | 69.19 | 57.79 | a | 54.42 | 61.17 | ||||||
| 1981 | 59.00 | b | 56.96 | e | 59.00 | a | 59.39 | b | 62.64 | c | 66.38 | a | 68.96 | e | 73.14 | b | 70.96 | b | 64.07 | a | 58.36 | b | 53.03 | a | 62.66 | |
| 1982 | 48.39 | 51.61 | 55.87 | 57.00 | 61.81 | 63.63 | 67.87 | 70.65 | ----- | z | 66.16 | 55.73 | 52.32 | 59.19 | ||||||||||||
| 1983 | 55.35 | 56.32 | 58.23 | 63.10 | 64.87 | 66.37 | 70.77 | 72.94 | 70.60 | 64.29 | 56.50 | 47.61 | 62.25 | |||||||||||||
| 1984 | 54.48 | 57.34 | 59.03 | 58.23 | 62.06 | 64.70 | 69.68 | 71.16 | 70.90 | 60.42 | 55.27 | 49.65 | 61.08 | |||||||||||||
| 1985 | 55.65 | 51.25 | 54.52 | 57.43 | 64.16 | 69.00 | 70.81 | 72.90 | 68.47 | 60.61 | 48.27 | 53.68 | 60.56 | |||||||||||||
| 1986 | 56.90 | 53.57 | 60.10 | 56.43 | 61.90 | 66.83 | 66.84 | 69.52 | 64.73 | 63.35 | 56.23 | 54.87 | 60.94 | |||||||||||||
| 1987 | 53.03 | 56.46 | 59.19 | 62.10 | 66.00 | 67.27 | 66.23 | 67.74 | 68.57 | 68.87 | 58.40 | 50.52 | 62.03 | |||||||||||||
| 1988 | 51.58 | 55.45 | 56.06 | 58.33 | 62.19 | 65.27 | 70.13 | 69.35 | 69.00 | a | 64.03 | 55.07 | 53.29 | 60.81 | ||||||||||||
| 1989 | 49.81 | 46.46 | 53.00 | 63.77 | 62.45 | 68.10 | 68.84 | 68.74 | 74.67 | 62.29 | 56.77 | 54.32 | 60.77 | |||||||||||||
| 1990 | 51.48 | 51.75 | 56.77 | 58.40 | 60.48 | 65.73 | 69.87 | 70.32 | 71.30 | 61.19 | 55.47 | 45.77 | 59.88 | |||||||||||||
| 1991 | 51.06 | 59.04 | 53.68 | 55.73 | 59.32 | 60.50 | 65.55 | 65.16 | 72.20 | 62.58 | 55.77 | 53.06 | 59.47 | |||||||||||||
| 1992 | 54.35 | 59.24 | 58.61 | 60.13 | 63.10 | 64.87 | 66.61 | 68.26 | 64.90 | 62.48 | 54.83 | 48.48 | 60.49 | |||||||||||||
| 1993 | 47.97 | 53.14 | 55.94 | 56.70 | 64.58 | 64.10 | 64.48 | 69.42 | 64.77 | 63.58 | 52.87 | 53.00 | 59.21 | |||||||||||||
| 1994 | 53.97 | 50.29 | 57.97 | 56.13 | 61.35 | 62.60 | 64.13 | 69.16 | 68.17 | 60.71 | 50.53 | 50.06 | 58.76 | |||||||||||||
| 1995 | 53.71 | 55.29 | 57.00 | 57.17 | 58.61 | 64.90 | 68.10 | 66.48 | 69.10 | 62.00 | 58.47 | 52.94 | 60.31 | |||||||||||||
| 1996 | 50.19 | 53.07 | 56.00 | 57.73 | 57.77 | 62.07 | 65.19 | 66.13 | 64.60 | 60.97 | 54.10 | 51.39 | 58.27 | |||||||||||||
| 1997 | 51.87 | 52.71 | 52.84 | 57.40 | 67.06 | 64.87 | 67.16 | 70.52 | 70.67 | 60.13 | ----- | z | 52.90 | 60.74 | ||||||||||||
| 1998 | 52.26 | 54.46 | 55.45 | 56.43 | 58.39 | 60.43 | 64.68 | 65.94 | 65.03 | 62.74 | 53.90 | 48.16 | 58.16 | |||||||||||||
| 1999 | 50.68 | 50.39 | 53.16 | 55.70 | 57.52 | 60.60 | 62.68 | 65.16 | 66.27 | 62.55 | 56.77 | 53.87 | 57.94 | |||||||||||||
| 2000 | 49.23 | 53.62 | 51.90 | 58.27 | 59.52 | 62.53 | 64.58 | 64.97 | 66.80 | 61.84 | 52.87 | 52.71 | 58.24 | |||||||||||||
| 2001 | 53.52 | 53.57 | 53.68 | 53.30 | 59.10 | 60.40 | 62.00 | 65.84 | 63.23 | 61.13 | 55.10 | 47.00 | z | 58.26 | ||||||||||||
| 2002 | 46.21 | l | 52.57 | 50.71 | 54.33 | 57.19 | 62.79 | a | 66.77 | 65.23 | 66.20 | 60.94 | 59.10 | 52.58 | 58.95 | |||||||||||
| 2003 | 56.00 | 52.79 | 53.08 | g | 55.10 | 59.35 | 64.75 | f | 65.71 | 65.37 | d | 66.43 | 62.65 | 52.87 | 51.84 | 58.81 | ||||||||||
| 2004 | 49.71 | 54.66 | 55.32 | 60.90 | 60.61 | 65.03 | 68.35 | 67.71 | 64.90 | 60.96 | g | 54.33 | 52.53 | n | 60.15 | |||||||||||
| 2005 | ----- | z | 56.18 | 57.71 | 56.17 | 62.97 | 63.10 | 65.62 | g | 66.59 | n | 63.10 | j | 59.40 | f | 54.09 | g | 52.00 | 58.02 | |||||||
| 2006 | 52.26 | 51.96 | 52.26 | 56.77 | ----- | z | 60.63 | 63.23 | 61.70 | k | 66.92 | e | 58.48 | 51.23 | h | 51.33 | g | 57.81 | ||||||||
| 2007 | 50.07 | d | 51.14 | 52.76 | j | 55.00 | e | 57.52 | 58.88 | e | 67.65 | k | 64.62 | e | 63.83 | f | 60.08 | g | 52.79 | f | 47.63 | l | 56.20 | |||
| 2008 | 45.95 | l | 51.50 | g | 49.04 | e | 52.57 | 58.33 | d | 57.36 | h | 61.87 | p | 63.23 | e | 62.96 | g | 60.45 | 57.00 | 45.29 | 55.13 | |||||
| 2009 | 50.65 | 51.86 | g | 48.87 | 52.12 | e | 57.45 | 61.70 | 62.67 | m | 64.32 | 66.43 | 58.17 | h | 53.53 | 47.12 | g | 56.88 | ||||||||
| 2010 | 54.39 | h | 56.39 | 56.80 | f | 55.00 | 55.50 | e | 59.57 | g | 63.30 | h | 64.61 | m | ----- | z | 61.38 | g | 52.43 | 50.90 | 54.05 | |||||
| 2011 | 50.55 | 47.58 | b | 51.44 | f | 52.00 | e | 55.70 | h | 62.76 | m | 64.21 | l | 65.26 | l | 67.11 | l | 61.37 | l | 54.18 | m | 49.33 | d | 49.86 | ||
| 2012 | 51.71 | g | 50.00 | e | 49.61 | 56.04 | d | 56.74 | d | 60.93 | c | ----- | z | 63.00 | z | 65.70 | j | 60.38 | e | 55.60 | 49.58 | e | 54.86 | |||
| 2013 | 48.32 | 49.84 | c | 51.54 | g | 59.00 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 49.08 | ||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 50.89 | 53.22 | 54.48 | 57.15 | 60.94 | 64.23 | 67.07 | 67.98 | 68.35 | 63.15 | 55.87 | 51.78 | 59.74 | |||||||||||||
| S.D. | 3.38 | 3.35 | 2.97 | 2.49 | 2.54 | 2.37 | 2.22 | 2.17 | 2.68 | 2.36 | 2.49 | 2.49 | 1.27 | |||||||||||||
| SKEW | -0.41 | 0.35 | 0.27 | 0.29 | 0.09 | 0.20 | 0.13 | 0.21 | 0.62 | 0.56 | -0.36 | -0.57 | 0.37 | |||||||||||||
| MAX | 59.00 | 60.82 | 61.19 | 63.77 | 67.06 | 70.48 | 71.84 | 73.14 | 75.63 | 70.15 | 61.60 | 56.19 | 62.66 | |||||||||||||
| MIN | 40.52 | 46.46 | 48.37 | 52.00 | 55.50 | 58.88 | 62.00 | 63.23 | 63.23 | 58.48 | 48.27 | 45.29 | 56.79 | |||||||||||||
| NO YRS | 78 | 82 | 77 | 82 | 80 | 78 | 74 | 77 | 75 | 76 | 77 | 78 | 64 | |||||||||||||