| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1940 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 46.53 | k | 9999.00 | |
| 1941 | 47.21 | 49.27 | 51.73 | 51.12 | 54.42 | 58.28 | 62.11 | 60.08 | 57.67 | 54.48 | 49.68 | 44.71 | 53.40 | |||||||||||||
| 1942 | 42.84 | 44.75 | 45.23 | a | 49.97 | 53.26 | 57.76 | a | 62.79 | 62.23 | 57.55 | 55.69 | 47.25 | 44.82 | a | 52.01 | ||||||||||
| 1943 | 39.50 | a | 47.70 | 45.69 | 50.35 | 51.70 | a | 55.63 | 59.26 | 59.02 | 57.92 | x | 54.39 | 50.38 | 44.29 | 50.72 | ||||||||||
| 1944 | 44.05 | 44.33 | 45.56 | 49.13 | c | 53.48 | a | 56.32 | 60.71 | 62.13 | 59.63 | 57.74 | 48.17 | 43.95 | 52.10 | |||||||||||
| 1945 | 45.90 | 45.80 | 44.79 | 47.57 | 54.06 | 57.02 | 59.76 | 58.19 | 57.42 | 53.50 | 46.18 | 44.53 | 51.23 | |||||||||||||
| 1946 | 43.95 | 44.20 | 45.71 | 47.22 | 54.31 | 55.95 | 60.13 | 59.19 | 57.88 | 50.24 | 45.15 | 45.19 | 50.76 | |||||||||||||
| 1947 | 40.97 | 47.98 | 49.55 | b | 52.98 | 55.35 | 57.20 | 60.38 | a | 60.02 | 59.05 | 54.15 | 47.97 | 45.63 | 52.60 | |||||||||||
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 59.66 | b | 59.82 | 58.58 | 51.53 | 44.35 | 39.26 | 52.20 | ||||||
| 1949 | 34.00 | 41.20 | 46.56 | 49.86 | a | 54.85 | d | ----- | z | ----- | z | 60.71 | s | 58.84 | a | 49.11 | 52.83 | 42.89 | 47.79 | |||||||
| 1950 | 34.89 | 42.89 | 44.11 | 47.68 | 49.55 | 56.87 | 58.65 | 60.10 | 57.13 | 51.92 | 47.32 | 49.23 | 50.03 | |||||||||||||
| 1951 | 41.15 | 44.55 | 43.15 | 49.30 | 53.08 | 56.30 | 60.48 | 59.40 | 58.65 | 54.53 | 48.83 | 40.76 | 50.85 | |||||||||||||
| 1952 | 40.03 | 42.55 | 44.44 | 47.80 | 52.08 | 55.13 | 59.74 | 60.48 | 58.58 | 56.84 | 46.25 | 44.24 | 50.68 | |||||||||||||
| 1953 | 48.29 | 45.32 | 45.66 | 48.65 | 53.26 | 56.18 | 59.90 | 61.69 | 60.22 | 56.00 | 50.75 | 46.15 | a | 52.67 | ||||||||||||
| 1954 | 42.02 | 46.32 | 44.19 | 47.78 | 53.34 | 55.12 | 57.92 | 60.40 | 59.20 | 55.13 | 52.30 | 44.85 | 51.55 | |||||||||||||
| 1955 | 42.61 | 42.46 | 42.35 | 44.55 | 50.40 | b | 56.65 | 58.32 | a | 57.73 | 58.35 | 53.81 | 47.00 | b | 43.47 | 49.81 | ||||||||||
| 1956 | 42.77 | 39.36 | 43.85 | 49.08 | 54.84 | 55.90 | 61.06 | 61.19 | 58.87 | 52.11 | 47.73 | 44.94 | 50.98 | |||||||||||||
| 1957 | 37.50 | 45.41 | 47.13 | 49.68 | 55.00 | 58.98 | 59.85 | 59.98 | 63.48 | 54.85 | 47.88 | 46.26 | 52.17 | |||||||||||||
| 1958 | 47.26 | 50.23 | 45.60 | 50.90 | 56.08 | 61.47 | 64.15 | 61.60 | 59.67 | 55.65 | 47.02 | 48.53 | 54.01 | |||||||||||||
| 1959 | 44.50 | 44.09 | 47.27 | 50.47 | 54.31 | 58.42 | 60.85 | 59.02 | 58.23 | 55.65 | 48.90 | 44.74 | 52.20 | |||||||||||||
| 1960 | 41.65 | 45.43 | 46.56 | 50.28 | 52.45 | 57.07 | 58.69 | 60.23 | 59.17 | 55.08 | 48.00 | 45.37 | 51.66 | |||||||||||||
| 1961 | 48.76 | 47.68 | 47.06 | 48.03 | 53.44 | 58.45 | 62.35 | 61.60 | 56.91 | c | 53.53 | 45.85 | 43.81 | 52.29 | ||||||||||||
| 1962 | 41.90 | 45.73 | 44.61 | 49.38 | 50.27 | 55.27 | 59.24 | 61.11 | 59.38 | 55.52 | 50.05 | 46.65 | 51.59 | |||||||||||||
| 1963 | 39.21 | 52.34 | 45.31 | 48.02 | 52.55 | 55.47 | 59.05 | 60.79 | 61.85 | 56.21 | 49.12 | 47.08 | 52.25 | |||||||||||||
| 1964 | 44.82 | 44.17 | 44.50 | 46.82 | 50.48 | 55.75 | 59.52 | 59.65 | 58.40 | 55.48 | 45.38 | 41.52 | 50.54 | |||||||||||||
| 1965 | 43.48 | 45.55 | 48.06 | 49.28 | 50.37 | 54.75 | 59.76 | 61.85 | 58.43 | 57.65 | 50.95 | 42.41 | c | 51.88 | ||||||||||||
| 1966 | 44.13 | 44.71 | 45.53 | 49.88 | 51.45 | 57.20 | 59.37 | 60.37 | 61.48 | 54.47 | 49.43 | 46.92 | 52.08 | |||||||||||||
| 1967 | 45.47 | 44.96 | 43.81 | 45.03 | 52.90 | 58.98 | 59.89 | 61.40 | 61.77 | 54.69 | 49.40 | 42.29 | 51.72 | |||||||||||||
| 1968 | 42.69 | 51.43 | 48.66 | 46.77 | 53.19 | 57.33 | 60.15 | 60.95 | 60.08 | 52.95 | 49.28 | 41.84 | 52.11 | |||||||||||||
| 1969 | 37.92 | 43.20 | 47.08 | 48.33 | 56.48 | 60.18 | 58.65 | 58.92 | 58.97 | 53.50 | 49.55 | 46.42 | 51.60 | |||||||||||||
| 1970 | 44.10 | 49.93 | 47.32 | 45.90 | 52.35 | 56.72 | 58.82 | 59.87 | 57.08 | 53.03 | 48.82 | 41.95 | 51.32 | |||||||||||||
| 1971 | 43.08 | 44.07 | 43.79 | 47.37 | 52.23 | a | 54.38 | 58.11 | 62.24 | 58.32 | 52.00 | 47.32 | 41.50 | 50.37 | ||||||||||||
| 1972 | 40.19 | 44.24 | 48.34 | 45.77 | 53.50 | a | 57.18 | 61.40 | 61.06 | 57.12 | 52.97 | 49.10 | 39.79 | 50.89 | ||||||||||||
| 1973 | 41.71 | 47.93 | 45.71 | 49.58 | 53.40 | 56.30 | 59.34 | 57.98 | 60.25 | 53.29 | 45.10 | 46.95 | 51.46 | |||||||||||||
| 1974 | 41.10 | 43.61 | 46.73 | 49.10 | 50.95 | 56.52 | 59.35 | 60.48 | 61.40 | 54.47 | 49.45 | 46.45 | 51.63 | |||||||||||||
| 1975 | 44.69 | 44.34 | 44.58 | 45.40 | 52.81 | 55.97 | 60.21 | 59.11 | 60.45 | 52.50 | 46.55 | 45.65 | 51.02 | |||||||||||||
| 1976 | 45.11 | 43.93 | 43.76 | 47.95 | 52.82 | 54.33 | 59.98 | 60.24 | 60.82 | 55.44 | 51.97 | 45.73 | 51.84 | |||||||||||||
| 1977 | 44.82 | 48.95 | 44.98 | 49.40 | 50.52 | 57.62 | 58.94 | 62.37 | 58.28 | 54.44 | 46.33 | 45.98 | 51.89 | |||||||||||||
| 1978 | 46.11 | 48.29 | 49.82 | 48.88 | 53.16 | 59.67 | 61.39 | 61.69 | 59.68 | 56.87 | 44.42 | 39.56 | 52.46 | |||||||||||||
| 1979 | 37.47 | 43.62 | 49.50 | 49.95 | 54.30 | a | 56.08 | 61.84 | 61.21 | 62.68 | 56.37 | 48.05 | 47.95 | 52.42 | ||||||||||||
| 1980 | 40.66 | 47.71 | 45.89 | 50.70 | 52.72 | a | 55.20 | 60.27 | 59.10 | 59.88 | 55.90 | 50.08 | 47.95 | 52.17 | ||||||||||||
| 1981 | 49.19 | 47.61 | 48.52 | 50.10 | 53.98 | 57.40 | 60.73 | 62.05 | 61.88 | j | 53.95 | 50.08 | 46.06 | 52.70 | ||||||||||||
| 1982 | 42.32 | 45.50 | 46.44 | 47.98 | 53.05 | 57.13 | 59.79 | 61.16 | 60.77 | 56.27 | 46.98 | 44.74 | 51.85 | |||||||||||||
| 1983 | 48.11 | 49.23 | 50.65 | 51.63 | 56.50 | 58.83 | 61.92 | 63.08 | 59.87 | 55.00 | 49.95 | 40.24 | 53.75 | |||||||||||||
| 1984 | 46.77 | 48.66 | 50.84 | 48.72 | 53.32 | 56.22 | 59.50 | 61.31 | 60.00 | 51.58 | 47.52 | 40.47 | 52.07 | |||||||||||||
| 1985 | 43.53 | 42.61 | 43.61 | 49.43 | 53.06 | 57.82 | 61.06 | 60.50 | 57.02 | 51.77 | 39.18 | 43.71 | 50.28 | |||||||||||||
| 1986 | 48.26 | 45.82 | 50.45 | 47.93 | 52.89 | 58.08 | 58.82 | 59.26 | 56.62 | 53.68 | 49.08 | 45.34 | 52.19 | |||||||||||||
| 1987 | 44.81 | 47.71 | 48.02 | 51.15 | 53.95 | a | 56.25 | 58.65 | a | ----- | z | 57.78 | a | 56.08 | 50.48 | 42.94 | 51.62 | |||||||||
| 1988 | 43.69 | 46.29 | 46.47 | 48.57 | 52.90 | 55.45 | 59.24 | 58.66 | 57.07 | 56.71 | 49.67 | 44.92 | 51.64 | |||||||||||||
| 1989 | 43.05 | 39.09 | 46.18 | 52.15 | 52.94 | 58.27 | 58.34 | 59.95 | 60.75 | 53.23 | 48.85 | 44.66 | 51.45 | |||||||||||||
| 1990 | 45.10 | 42.55 | 48.65 | 50.72 | 52.42 | 57.22 | 61.08 | 62.05 | 60.87 | 52.23 | 48.62 | 37.35 | 51.57 | |||||||||||||
| 1991 | 42.82 | 50.68 | 44.29 | ----- | z | ----- | z | 54.55 | ----- | z | ----- | z | ----- | z | 54.32 | 48.65 | 45.32 | 48.66 | ||||||||
| 1992 | 46.61 | 51.45 | ----- | z | 52.20 | 54.89 | 57.58 | ----- | z | 61.29 | 57.83 | 54.18 | 47.57 | 41.65 | 52.52 | |||||||||||
| 1993 | 40.06 | 43.41 | 48.40 | 50.33 | 55.94 | 57.27 | 59.24 | 61.02 | 56.73 | 54.85 | 43.62 | 43.95 | 51.24 | |||||||||||||
| 1994 | 46.65 | 43.50 | 48.58 | 49.20 | 52.90 | 55.37 | 58.48 | 60.73 | a | 60.42 | 51.31 | 43.27 | 44.23 | 51.22 | ||||||||||||
| 1995 | 47.08 | 48.59 | 47.63 | 48.62 | 52.55 | 56.72 | 60.95 | 59.53 | 61.57 | 53.58 | 52.03 | 45.97 | 52.90 | |||||||||||||
| 1996 | 44.42 | 44.90 | 47.39 | 50.37 | 51.10 | 55.73 | 59.29 | 59.31 | 56.78 | 52.76 | 47.32 | 44.97 | a | 51.19 | ||||||||||||
| 1997 | 44.48 | 45.50 | 46.15 | 49.20 | 57.16 | 58.30 | 60.18 | 62.34 | 61.45 | 52.90 | 51.27 | 44.03 | 52.75 | |||||||||||||
| 1998 | 47.16 | 47.27 | 47.44 | 48.05 | 52.81 | 56.78 | 61.03 | 60.13 | 58.07 | 53.66 | 49.22 | 42.08 | 51.97 | |||||||||||||
| 1999 | 44.76 | 44.75 | 44.71 | 47.60 | 50.13 | 55.42 | 58.44 | 61.08 | 57.20 | 53.53 | 51.20 | 47.16 | 51.33 | |||||||||||||
| 2000 | 43.21 | 46.60 | 45.44 | 50.52 | 52.81 | 58.05 | a | 59.97 | 59.76 | 59.78 | 54.08 | 45.22 | 45.55 | 51.75 | ||||||||||||
| 2001 | 45.73 | 44.32 | 47.08 | 46.12 | 52.84 | 54.80 | 57.82 | 60.37 | 57.47 | 52.18 | 49.85 | 45.34 | 51.16 | |||||||||||||
| 2002 | 43.92 | 45.88 | 44.26 | 49.02 | 50.35 | 57.15 | 60.05 | 60.24 | 58.23 | 53.47 | 51.30 | 47.35 | 51.77 | |||||||||||||
| 2003 | 50.40 | 45.98 | 49.11 | 48.43 | 51.84 | 58.62 | 60.39 | 60.77 | 59.53 | 57.42 | 46.68 | 45.97 | 52.93 | |||||||||||||
| 2004 | 44.53 | 47.60 | 49.37 | 52.35 | 55.11 | 58.55 | 62.13 | 63.11 | 59.02 | 54.79 | 47.67 | 46.35 | 53.38 | |||||||||||||
| 2005 | 46.23 | 47.34 | 49.97 | 50.12 | 56.69 | 56.98 | 60.16 | 60.39 | 55.70 | 54.50 | 47.20 | 45.27 | 52.55 | |||||||||||||
| 2006 | 47.02 | 44.68 | 45.42 | 49.25 | 53.69 | 56.92 | 60.00 | 58.32 | 58.13 | 51.87 | 48.57 | 44.82 | 51.56 | |||||||||||||
| 2007 | 42.23 | 46.45 | 47.57 | c | 48.55 | 51.40 | 55.45 | 61.82 | 60.55 | 57.78 | 53.44 | 48.28 | 44.48 | 51.50 | ||||||||||||
| 2008 | 42.68 | 46.43 | 45.58 | 46.85 | 53.94 | 53.72 | 58.32 | 59.94 | 58.52 | 54.35 | 52.25 | 43.00 | 51.30 | |||||||||||||
| 2009 | 45.94 | 45.82 | 45.27 | 48.27 | 52.85 | 57.62 | 60.02 | 60.74 | 60.72 | 54.47 | 49.70 | 43.69 | 52.09 | |||||||||||||
| 2010 | 49.76 | 49.70 | 48.71 | 49.08 | 51.32 | 55.35 | 58.89 | 58.89 | 60.22 | 55.13 | 47.90 | 47.13 | 52.67 | |||||||||||||
| 2011 | 46.85 | 43.68 | 47.55 | 46.40 | 50.87 | 56.92 | 59.24 | 60.18 | 59.68 | 55.21 | 47.20 | 43.98 | 51.48 | |||||||||||||
| 2012 | 45.66 | 46.38 | 45.40 | 50.47 | 51.84 | 55.67 | 59.98 | 60.19 | 57.50 | 53.95 | 50.83 | 45.40 | 51.94 | |||||||||||||
| 2013 | 43.55 | 46.52 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 45.03 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 43.82 | 45.87 | 46.56 | 48.93 | 53.05 | 56.80 | 59.97 | 60.46 | 59.05 | 54.17 | 48.30 | 44.45 | 51.78 | |||||||||||||
| S.D. | 3.26 | 2.65 | 2.09 | 1.76 | 1.70 | 1.47 | 1.25 | 1.20 | 1.63 | 1.72 | 2.38 | 2.32 | 0.83 | |||||||||||||
| SKEW | -0.60 | 0.12 | 0.38 | -0.21 | 0.23 | 0.48 | 0.75 | -0.11 | 0.40 | -0.23 | -0.82 | -0.68 | 0.28 | |||||||||||||
| MAX | 50.40 | 52.34 | 51.73 | 52.98 | 57.16 | 61.47 | 64.15 | 63.11 | 63.48 | 57.74 | 52.83 | 49.23 | 54.01 | |||||||||||||
| MIN | 34.00 | 39.09 | 42.35 | 44.55 | 49.55 | 53.72 | 57.82 | 57.73 | 55.70 | 49.11 | 39.18 | 37.35 | 49.81 | |||||||||||||
| NO YRS | 72 | 72 | 70 | 70 | 70 | 70 | 69 | 69 | 69 | 72 | 72 | 72 | 65 | |||||||||||||