| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1930 | 35.63 | p | 46.55 | 47.05 | 50.63 | 50.85 | 56.08 | 57.98 | 61.53 | 57.88 | 51.97 | 50.52 | 47.66 | 52.61 | ||||||||||||
| 1931 | 50.44 | 48.29 | 49.87 | 51.93 | 55.63 | 58.45 | 62.08 | 62.16 | 63.80 | 59.32 | 50.75 | 44.16 | 54.74 | |||||||||||||
| 1932 | 43.24 | 42.97 | 48.55 | 50.12 | 52.11 | 59.43 | 58.60 | 60.31 | 58.15 | 54.94 | 50.00 | 42.08 | 51.71 | |||||||||||||
| 1933 | 42.85 | 42.68 | 45.60 | 49.20 | 50.24 | 57.60 | 58.50 | 60.89 | 57.20 | ----- | z | ----- | z | 47.00 | 51.18 | |||||||||||
| 1934 | 47.34 | 52.52 | 52.44 | 52.15 | 55.79 | 55.75 | 58.66 | 60.05 | 57.95 | 54.19 | 50.52 | 46.18 | 53.63 | |||||||||||||
| 1935 | 42.76 | 46.80 | 42.45 | 47.60 | 50.65 | 57.05 | 57.95 | 58.21 | 57.97 | 50.61 | 43.80 | 45.50 | 50.11 | |||||||||||||
| 1936 | 45.37 | 40.47 | 43.74 | 50.33 | 54.48 | 59.08 | 60.92 | 62.31 | 55.63 | 54.13 | 47.12 | 44.90 | 51.54 | |||||||||||||
| 1937 | 34.11 | 42.34 | 47.37 | 47.10 | 51.60 | 56.83 | 58.19 | 58.92 | 57.93 | 56.40 | 50.18 | 46.05 | 50.59 | |||||||||||||
| 1938 | 45.03 | 44.25 | 45.79 | 50.13 | 51.00 | 54.95 | 57.24 | 57.82 | 59.03 | 54.57 | a | 47.15 | 44.65 | 50.97 | ||||||||||||
| 1939 | 43.97 | 41.12 | 45.06 | 49.02 | 51.82 | a | 55.02 | 57.60 | 60.87 | 57.12 | 53.45 | 50.67 | 48.37 | 51.17 | ||||||||||||
| 1940 | 46.77 | 47.53 | 48.23 | 51.28 | 54.27 | 56.72 | 59.73 | 61.19 | 60.67 | 56.76 | 46.00 | 46.89 | 53.00 | |||||||||||||
| 1941 | 47.06 | 49.70 | 50.85 | 51.88 | 55.31 | 59.22 | 62.63 | 59.77 | 58.30 | 54.84 | 50.43 | 45.58 | 53.80 | |||||||||||||
| 1942 | 44.11 | 44.79 | 45.79 | 50.40 | 53.40 | 57.25 | 64.87 | 63.29 | 59.42 | 55.71 | 48.33 | 46.35 | 52.81 | |||||||||||||
| 1943 | 40.19 | 48.32 | 46.02 | 50.62 | 51.45 | 56.43 | 58.79 | 60.24 | 58.30 | 55.15 | 49.88 | 45.37 | 51.73 | |||||||||||||
| 1944 | 45.58 | 45.02 | 45.31 | 49.43 | 53.61 | 56.02 | 59.13 | 60.56 | 58.35 | 56.77 | 48.98 | 44.95 | 51.98 | |||||||||||||
| 1945 | 46.06 | 45.88 | 44.69 | 47.68 | 53.89 | 55.20 | 58.47 | 57.90 | 56.92 | 52.63 | 47.32 | 44.98 | 50.97 | |||||||||||||
| 1946 | 45.10 | 44.61 | 45.27 | 47.33 | 54.61 | 56.03 | 60.73 | 58.95 | 59.17 | 50.68 | 46.67 | 45.27 | 51.20 | |||||||||||||
| 1947 | 41.37 | 47.95 | 49.44 | 52.00 | 55.05 | 58.20 | 61.18 | 60.87 | 59.67 | 55.05 | 49.03 | 48.24 | 53.17 | |||||||||||||
| 1948 | 45.29 | 42.60 | 45.74 | 46.73 | 53.85 | 59.82 | 59.73 | 61.27 | 59.57 | 55.55 | 42.28 | 36.60 | 50.75 | |||||||||||||
| 1949 | 35.18 | a | 41.86 | 47.23 | a | 50.43 | 54.52 | a | 54.72 | 57.81 | 60.77 | 60.67 | 50.61 | 53.30 | 44.08 | 50.93 | ||||||||||
| 1950 | 34.97 | 43.82 | 45.23 | 47.57 | a | 50.31 | 58.17 | 58.73 | 60.74 | 57.20 | 52.03 | a | 48.68 | 49.98 | 50.62 | |||||||||||
| 1951 | 43.15 | 44.93 | a | 43.53 | 48.93 | 52.94 | 57.08 | 60.34 | 59.15 | 58.08 | 54.26 | b | 49.80 | 42.55 | 51.23 | |||||||||||
| 1952 | 41.45 | 43.81 | 43.39 | 47.82 | 52.23 | 55.15 | 58.81 | 59.62 | a | 58.25 | 56.77 | 46.05 | 44.89 | 50.69 | ||||||||||||
| 1953 | 47.82 | 44.72 | a | 45.87 | 48.05 | 52.52 | 54.50 | 58.85 | 60.48 | 59.50 | 54.78 | a | 50.57 | 46.66 | 52.03 | |||||||||||
| 1954 | 40.85 | 45.93 | 43.00 | 46.81 | a | 51.98 | a | 54.03 | 56.71 | 58.42 | 57.71 | a | 53.13 | 51.67 | 45.27 | 50.46 | ||||||||||
| 1955 | 43.06 | 42.88 | 41.75 | a | 44.55 | a | 50.63 | a | 56.00 | 58.16 | 58.08 | 57.36 | a | 53.26 | b | 44.50 | a | 43.24 | 49.46 | |||||||
| 1956 | 43.68 | a | 40.39 | a | 43.92 | 49.10 | 53.85 | 55.97 | 60.34 | 60.35 | a | 58.57 | 52.95 | a | 47.07 | 44.39 | 50.88 | |||||||||
| 1957 | 38.08 | 44.64 | 47.61 | 49.77 | 54.73 | 58.53 | 59.77 | 60.80 | a | 62.97 | 55.15 | 48.72 | 46.68 | 52.29 | ||||||||||||
| 1958 | 48.23 | 51.18 | 45.92 | 50.32 | 55.74 | 61.67 | 62.32 | 61.31 | 59.74 | a | 55.73 | 47.58 | 50.37 | 54.17 | ||||||||||||
| 1959 | 45.56 | 44.30 | 46.74 | 51.27 | 53.95 | 58.32 | 59.76 | 59.19 | 57.40 | 54.97 | 47.77 | 43.81 | 51.92 | |||||||||||||
| 1960 | 42.53 | 44.67 | 45.84 | 49.52 | 51.87 | 56.10 | 56.75 | a | 59.47 | 57.60 | 55.02 | 47.55 | 45.60 | 51.04 | ||||||||||||
| 1961 | 48.48 | 47.88 | 46.50 | 48.10 | 52.45 | 57.45 | 61.63 | 60.21 | 56.98 | 52.93 | a | 44.93 | 43.26 | b | 51.73 | |||||||||||
| 1962 | 42.03 | 45.14 | 44.21 | 48.87 | 50.94 | 54.62 | 57.66 | 60.45 | 58.37 | c | 54.13 | 49.16 | a | 46.21 | 50.98 | |||||||||||
| 1963 | 39.55 | 51.34 | 45.27 | 48.17 | 54.89 | 56.22 | 59.71 | b | 59.92 | 61.18 | 54.71 | 48.98 | 47.10 | 52.25 | ||||||||||||
| 1964 | 44.82 | 43.84 | 45.06 | 47.02 | 50.77 | 56.22 | 59.21 | 59.42 | 57.45 | b | 56.26 | 45.53 | 41.76 | 50.61 | ||||||||||||
| 1965 | 43.50 | 45.29 | 48.39 | 49.52 | 50.95 | 54.90 | 59.16 | 61.45 | 58.18 | 56.37 | 51.35 | 42.90 | 51.83 | |||||||||||||
| 1966 | 44.00 | f | 44.77 | 45.02 | 50.73 | 50.90 | 57.37 | 59.31 | 59.35 | 60.28 | 53.92 | 49.80 | 47.52 | 52.63 | ||||||||||||
| 1967 | 45.68 | 45.39 | 44.32 | 45.47 | 52.37 | 57.93 | 60.66 | 61.47 | 62.05 | 56.13 | 50.52 | 43.32 | 52.11 | |||||||||||||
| 1968 | 44.21 | 50.98 | 48.95 | 47.93 | 53.31 | 57.12 | 60.55 | 60.24 | 59.62 | 53.44 | 49.70 | 42.27 | 52.36 | |||||||||||||
| 1969 | 38.08 | 43.23 | 46.95 | 48.87 | 55.74 | 59.87 | 58.90 | 59.40 | 58.17 | 53.85 | 49.62 | 46.87 | 51.63 | |||||||||||||
| 1970 | 44.84 | 50.25 | 47.37 | 47.13 | 52.40 | 57.02 | 58.71 | 58.44 | 57.48 | 54.10 | 49.78 | 43.29 | 51.73 | |||||||||||||
| 1971 | 42.81 | 44.95 | 43.74 | 48.27 | 52.18 | 55.43 | 57.97 | 62.32 | 58.55 | 52.18 | 47.73 | 42.32 | 50.70 | |||||||||||||
| 1972 | 40.27 | 43.67 | 47.42 | 46.35 | 53.82 | 56.88 | 61.37 | 60.34 | 56.33 | 53.13 | 48.67 | 40.48 | 50.73 | |||||||||||||
| 1973 | 42.61 | 47.68 | 46.29 | 49.65 | 53.58 | 56.80 | 58.23 | 57.32 | 59.58 | 52.74 | 45.25 | 46.89 | 51.39 | |||||||||||||
| 1974 | 41.00 | 44.12 | 46.73 | 49.33 | 51.44 | 54.90 | 57.10 | 59.08 | 61.17 | 52.31 | 48.22 | a | 46.37 | 50.98 | ||||||||||||
| 1975 | 43.04 | d | 43.29 | 44.35 | 45.58 | d | 52.35 | 55.00 | 59.92 | 59.22 | b | 62.12 | a | 52.80 | c | 46.41 | c | 45.44 | 50.79 | |||||||
| 1976 | 45.40 | a | 43.68 | a | 43.59 | b | 48.71 | b | 53.16 | f | 55.09 | g | 59.06 | g | 59.83 | d | 61.46 | b | 55.13 | 50.50 | b | 46.46 | d | 50.53 | ||
| 1977 | 43.72 | b | 48.88 | 45.23 | 49.81 | a | 51.53 | b | 57.22 | a | 58.80 | c | 60.90 | b | 58.05 | 53.48 | b | 46.38 | b | 45.80 | a | 51.65 | ||||
| 1978 | 46.66 | 48.22 | c | 48.74 | l | 49.16 | h | 53.67 | b | 60.54 | d | 61.29 | g | 62.04 | f | 59.72 | l | 57.02 | d | 43.87 | c | 40.00 | a | 50.00 | ||
| 1979 | 39.60 | b | 44.86 | c | 49.38 | g | 50.58 | 54.76 | 56.35 | 61.90 | b | 61.50 | a | 62.34 | a | 56.84 | c | 47.71 | d | 47.89 | c | 53.12 | ||||
| 1980 | 40.33 | a | 48.09 | a | 47.74 | f | 50.93 | 53.23 | 56.07 | b | 61.15 | ----- | z | 59.14 | e | 56.52 | 50.26 | a | 47.27 | 52.30 | ||||||
| 1981 | 49.53 | b | 47.30 | e | 48.97 | a | 50.02 | d | 53.94 | d | 57.98 | a | 59.79 | e | 62.66 | c | 58.10 | i | 51.80 | c | 48.46 | b | 44.18 | a | 52.24 | |
| 1982 | 41.00 | 44.16 | 46.32 | 46.93 | 52.10 | 56.52 | 59.45 | 60.85 | ----- | z | 56.15 | 46.50 | 44.47 | 50.40 | ||||||||||||
| 1983 | 47.85 | 48.84 | 48.94 | 50.47 | 55.32 | 57.27 | 62.06 | 62.60 | 58.33 | a | 52.27 | 49.82 | 39.21 | 52.75 | ||||||||||||
| 1984 | 46.08 | 48.16 | 50.31 | 49.20 | 53.02 | 56.40 | 59.13 | 60.03 | 59.12 | 52.16 | 47.68 | 42.02 | 51.94 | |||||||||||||
| 1985 | 43.29 | 41.71 | 43.85 | 48.90 | 53.74 | 57.85 | 60.52 | 61.10 | 57.47 | 52.31 | 40.93 | 42.39 | 50.34 | |||||||||||||
| 1986 | 48.60 | 45.66 | 51.02 | 48.22 | 53.37 | 57.72 | 59.26 | 60.27 | 56.30 | 54.61 | 49.15 | 46.45 | 52.55 | |||||||||||||
| 1987 | 44.97 | 47.98 | 49.24 | b | 51.85 | 56.32 | 56.97 | 58.97 | 59.31 | 58.33 | 55.81 | 51.05 | 42.95 | 52.81 | ||||||||||||
| 1988 | 44.42 | 47.24 | 47.82 | 50.47 | 53.82 | 56.38 | 60.55 | 60.15 | 58.07 | a | 56.61 | 49.65 | 46.10 | 52.61 | ||||||||||||
| 1989 | 44.40 | 39.02 | 46.29 | 53.52 | 53.85 | 59.88 | 60.66 | 61.29 | 61.57 | 53.60 | 49.83 | 46.34 | 52.52 | |||||||||||||
| 1990 | 45.71 | 44.20 | 48.45 | 51.50 | 53.42 | 58.33 | 61.63 | 62.45 | 61.52 | 53.06 | 49.60 | 38.69 | 52.38 | |||||||||||||
| 1991 | 43.50 | 50.36 | 45.24 | 48.67 | 52.71 | 54.85 | 58.89 | 59.76 | 60.92 | 52.89 | 49.83 | 47.11 | 52.06 | |||||||||||||
| 1992 | 47.76 | 50.53 | 50.11 | 52.60 | 54.40 | 58.35 | 59.87 | 60.66 | 57.02 | 54.52 | 48.90 | 42.44 | 53.10 | |||||||||||||
| 1993 | 41.06 | 43.84 | 48.73 | 50.53 | 56.74 | 57.55 | 59.42 | 61.40 | 56.42 | 55.27 | 44.22 | 45.56 | 51.73 | |||||||||||||
| 1994 | 47.21 | 43.79 | 49.34 | 50.40 | 53.66 | 56.07 | 58.40 | 61.66 | 59.85 | 52.35 | 44.23 | 44.53 | 51.79 | |||||||||||||
| 1995 | 48.39 | 47.91 | 47.32 | 49.17 | 52.94 | 57.47 | 61.39 | 58.68 | 61.77 | 54.02 | 51.60 | 47.05 | 53.14 | |||||||||||||
| 1996 | 44.56 | 45.14 | 48.32 | 51.37 | 51.60 | 55.47 | 58.42 | 58.58 | 56.28 | 52.73 | 48.30 | 44.73 | 51.29 | |||||||||||||
| 1997 | 45.76 | 45.57 | 46.65 | 49.55 | 57.66 | 58.20 | 60.63 | 63.10 | 62.23 | 53.87 | ----- | z | 45.69 | 53.54 | ||||||||||||
| 1998 | 46.71 | 47.75 | 48.32 | 48.03 | 52.73 | 56.38 | 59.77 | 59.53 | a | 57.00 | 54.16 | 48.80 | 42.68 | 51.82 | ||||||||||||
| 1999 | 44.87 | a | 45.02 | 45.48 | a | 47.00 | 50.32 | 54.87 | 56.97 | b | 59.38 | b | 55.77 | b | 53.13 | 50.43 | a | 47.20 | a | 50.87 | ||||||
| 2000 | 43.07 | a | 46.40 | 44.97 | a | 49.87 | c | 52.92 | 55.96 | b | 58.25 | e | 58.79 | b | 58.53 | a | 53.92 | a | 45.13 | 45.66 | 51.12 | |||||
| 2001 | 45.90 | 44.12 | 46.80 | a | 46.81 | a | 51.37 | 53.97 | 57.00 | c | 59.81 | b | 56.41 | b | 53.16 | 48.76 | k | 40.75 | z | 51.54 | ||||||
| 2002 | 40.88 | o | 45.07 | 44.06 | 47.42 | 50.06 | 56.34 | a | 59.55 | 58.06 | 56.82 | 51.97 | 50.28 | 46.42 | 51.46 | |||||||||||
| 2003 | 49.47 | 44.34 | 47.40 | g | 48.42 | 51.26 | 56.90 | f | 59.08 | 58.70 | d | 57.73 | 55.81 | 45.82 | 45.55 | 51.62 | ||||||||||
| 2004 | 44.63 | 46.91 | 47.98 | 50.70 | 54.34 | 57.97 | 61.32 | 61.97 | 57.55 | 53.38 | g | 46.81 | d | 46.38 | n | 53.02 | ||||||||||
| 2005 | ----- | z | 45.79 | 48.61 | 49.73 | 56.16 | 56.65 | 58.98 | g | 59.03 | n | 53.68 | k | 53.12 | f | 46.39 | g | 45.06 | 50.33 | |||||||
| 2006 | 46.82 | 43.88 | 44.63 | 48.52 | ----- | z | 55.65 | 57.65 | 56.40 | k | 56.91 | g | 50.02 | 46.95 | i | 44.87 | h | 49.59 | ||||||||
| 2007 | 41.65 | d | 44.79 | 46.64 | j | 47.30 | e | 50.53 | 53.34 | e | 63.19 | m | 58.56 | e | 55.77 | f | 51.48 | g | 46.02 | f | 42.87 | l | 49.36 | |||
| 2008 | 41.97 | l | 45.48 | g | 43.13 | e | 44.75 | 52.74 | d | 53.09 | h | 57.00 | p | 58.71 | e | 56.28 | g | 52.31 | 50.75 | 40.40 | 48.97 | |||||
| 2009 | 44.25 | g | 43.29 | g | 43.35 | 46.28 | e | 50.87 | 56.43 | 56.47 | m | 59.42 | 58.73 | 52.30 | h | 49.28 | 39.67 | g | 52.05 | |||||||
| 2010 | 49.20 | i | 48.82 | 48.28 | f | 48.45 | 49.58 | e | 53.89 | g | 57.07 | h | 57.97 | m | ----- | z | 52.54 | g | 46.52 | 45.77 | 47.83 | |||||
| 2011 | 44.74 | 41.21 | b | 45.00 | f | 44.96 | e | 49.67 | h | 56.47 | m | 57.03 | l | 59.84 | l | 57.58 | l | 53.68 | l | 45.06 | m | 41.54 | f | 43.64 | ||
| 2012 | 44.77 | g | 43.56 | e | 43.55 | 49.08 | e | 50.57 | d | 55.20 | c | ----- | z | 58.50 | z | 56.38 | j | 52.23 | e | 49.70 | 44.60 | e | 48.56 | |||
| 2013 | 41.97 | 44.78 | e | 45.75 | g | 51.00 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 43.38 | ||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 43.97 | 45.57 | 46.40 | 49.04 | 52.98 | 56.79 | 59.48 | 60.18 | 58.77 | 54.08 | 48.30 | 44.87 | 51.74 | |||||||||||||
| S.D. | 3.28 | 2.74 | 2.26 | 1.89 | 1.79 | 1.61 | 1.57 | 1.35 | 1.85 | 1.79 | 2.36 | 2.47 | 1.04 | |||||||||||||
| SKEW | -0.72 | 0.30 | 0.29 | -0.19 | 0.25 | 0.44 | 0.64 | 0.16 | 0.70 | 0.14 | -0.76 | -0.77 | 0.49 | |||||||||||||
| MAX | 50.44 | 52.52 | 52.44 | 53.52 | 57.66 | 61.67 | 64.87 | 63.29 | 63.80 | 59.32 | 53.30 | 50.37 | 54.74 | |||||||||||||
| MIN | 34.11 | 39.02 | 41.75 | 44.55 | 49.58 | 53.34 | 56.71 | 57.32 | 55.63 | 50.02 | 40.93 | 36.60 | 49.46 | |||||||||||||
| NO YRS | 76 | 82 | 76 | 82 | 80 | 78 | 74 | 76 | 73 | 76 | 76 | 77 | 61 | |||||||||||||