| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1925 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 64.16 | 63.26 | 60.48 | 53.21 | 45.23 | 44.29 | 55.11 | |||||||
| 1926 | 40.97 | 46.30 | 50.06 | 55.65 | 54.71 | 61.90 | 64.61 | 64.21 | 57.27 | 55.82 | 48.03 | 41.16 | 53.39 | |||||||||||||
| 1927 | 39.61 | 43.93 | 45.44 | 50.90 | 56.29 | 64.65 | 63.65 | 65.02 | 59.38 | 53.35 | 46.40 | a | 36.21 | 52.07 | ||||||||||||
| 1928 | 38.08 | 42.40 | 48.95 | 49.18 | 59.13 | e | 59.50 | g | 65.50 | 62.31 | 60.33 | 52.85 | 44.88 | 37.75 | c | 51.03 | ||||||||||
| 1929 | 33.48 | c | 34.00 | 45.45 | 46.93 | 54.06 | 59.10 | 63.00 | 64.55 | 59.94 | c | 54.68 | 41.90 | 42.58 | 49.97 | |||||||||||
| 1930 | 25.58 | 44.09 | 46.95 | 52.87 | 51.68 | 58.53 | 61.58 | 64.63 | 60.10 | 50.13 | 43.83 | 38.47 | 49.87 | |||||||||||||
| 1931 | 42.45 | 41.89 | 46.50 | 50.73 | 57.55 | 58.25 | 63.69 | 62.42 | 58.98 | 51.84 | 40.93 | 38.50 | 51.15 | |||||||||||||
| 1932 | 37.33 | a | 39.98 | 45.74 | 50.20 | 53.32 | 60.58 | 60.03 | a | 63.73 | 59.98 | 53.60 | 47.13 | 34.03 | 50.47 | |||||||||||
| 1933 | 38.47 | 37.48 | 45.03 | 48.95 | 51.53 | 57.98 | 62.63 | 65.47 | a | 56.98 | 56.96 | r | 44.82 | 44.18 | 50.32 | |||||||||||
| 1934 | 44.39 | 47.14 | 51.15 | 55.60 | 58.10 | 59.43 | 62.16 | 65.44 | 60.13 | 54.40 | 48.18 | 42.25 | a | 54.03 | ||||||||||||
| 1935 | 38.06 | 43.36 | 41.39 | 48.98 | 54.42 | 60.07 | 63.24 | 64.03 | 61.62 | 49.94 | 39.95 | 38.65 | 50.31 | |||||||||||||
| 1936 | 41.52 | a | 34.05 | 42.71 | 52.53 | 57.23 | 60.80 | 62.37 | 64.10 | 59.48 | a | 54.37 | 42.65 | 41.56 | 51.11 | |||||||||||
| 1937 | 28.81 | 39.18 | 47.08 | 46.67 | 54.10 | 61.63 | 63.68 | 62.55 | 61.60 | 55.31 | 48.02 | 41.68 | 50.86 | |||||||||||||
| 1938 | 39.52 | 40.88 | 44.16 | 50.43 | 54.58 | 60.85 | 65.58 | 61.50 | 63.43 | 52.68 | 41.20 | 39.65 | 51.20 | |||||||||||||
| 1939 | 41.08 | 37.71 | 44.90 | 50.25 | 54.73 | 57.60 | 63.00 | 64.94 | 60.87 | 52.68 | 45.82 | 44.02 | 51.47 | |||||||||||||
| 1940 | 39.84 | 43.86 | 47.39 | 50.47 | 57.16 | 61.17 | 64.26 | 65.00 | 62.00 | 54.97 | 41.10 | 41.61 | 52.40 | |||||||||||||
| 1941 | 41.13 | 44.27 | 50.24 | 51.48 | 55.29 | 59.68 | 67.92 | 65.13 | 57.72 | 51.85 | 46.67 | 41.16 | 52.71 | |||||||||||||
| 1942 | 36.00 | 41.52 | 43.34 | 50.67 | 54.68 | 58.67 | 65.42 | a | 65.94 | 60.83 | 52.82 | 43.62 | 42.10 | 51.30 | ||||||||||||
| 1943 | 33.19 | 42.84 | 42.61 | 51.62 | 52.63 | 59.03 | 64.35 | 62.77 | 63.00 | 53.15 | 45.95 | 39.56 | 50.89 | |||||||||||||
| 1944 | 38.42 | 40.93 | 43.69 | 49.60 | 53.87 | 59.60 | 65.32 | 63.47 | 63.13 | 56.58 | 44.53 | 37.00 | 51.35 | |||||||||||||
| 1945 | 40.61 | 42.14 | 42.29 | 47.17 | 56.71 | 58.03 | 65.87 | 64.37 | 56.00 | 52.48 | 43.85 | 40.27 | 50.82 | |||||||||||||
| 1946 | 40.10 | 40.77 | 44.74 | 49.20 | 57.45 | 58.40 | 64.66 | 64.81 | 59.42 | 49.00 | 41.10 | 39.85 | 50.79 | |||||||||||||
| 1947 | 34.45 | 43.61 | 47.85 | 52.47 | 57.56 | 60.27 | 64.48 | 63.39 | 61.08 | 53.45 | 46.02 | 42.61 | 52.27 | |||||||||||||
| 1948 | 39.21 | 39.05 | 43.16 | 47.40 | 54.44 | 63.05 | 63.52 | 63.39 | 59.37 | 52.32 | 42.63 | 36.87 | 50.37 | |||||||||||||
| 1949 | 28.71 | 37.91 | 45.50 | 49.78 | 57.65 | 58.83 | a | 62.26 | 63.87 | 62.60 | 49.50 | 50.25 | 39.85 | 50.56 | ||||||||||||
| 1950 | 28.21 | 39.07 | 43.30 | a | 47.72 | 52.71 | 60.33 | 63.60 | 66.30 | a | 61.05 | a | 50.26 | 45.68 | 45.23 | 50.29 | ||||||||||
| 1951 | 38.74 | 41.73 | 40.53 | 52.27 | 54.98 | 62.43 | 64.76 | 63.15 | 61.80 | 52.60 | 44.70 | 37.47 | 51.26 | |||||||||||||
| 1952 | 34.61 | 40.60 | 42.34 | 49.38 | 53.73 | 57.88 | 65.65 | 65.37 | 63.38 | 57.24 | 40.72 | 41.32 | 51.02 | |||||||||||||
| 1953 | 46.18 | 42.66 | 44.73 | 48.32 | 54.00 | 57.40 | 64.06 | 64.53 | 61.27 | 53.27 | 47.92 | 42.39 | 52.23 | |||||||||||||
| 1954 | 37.10 | 42.61 | 42.23 | 47.38 | 55.20 | c | 56.30 | 60.45 | 62.47 | 60.05 | 51.77 | 48.92 | 39.98 | 50.37 | ||||||||||||
| 1955 | 39.08 | 39.93 | 39.66 | 45.12 | 52.11 | 59.52 | 60.73 | 62.92 | 59.30 | 53.89 | 40.27 | 39.87 | 49.37 | |||||||||||||
| 1956 | 40.11 | 35.48 | 43.39 | 53.54 | c | 58.82 | 57.52 | 65.10 | 63.98 | 60.33 | 51.58 | 42.72 | 40.60 | 51.10 | ||||||||||||
| 1957 | 32.24 | 40.57 | 45.55 | a | 51.00 | 57.89 | 60.77 | 63.23 | 62.44 | 64.83 | a | 52.66 | 42.77 | 43.02 | 51.41 | |||||||||||
| 1958 | 43.26 | 47.95 | 45.03 | 49.72 | 59.81 | 63.82 | 68.89 | 67.42 | 61.03 | 55.60 | 46.18 | 45.16 | 54.49 | |||||||||||||
| 1959 | 42.27 | 42.38 | 46.48 | 51.47 | 53.56 | 60.00 | 65.50 | 62.94 | 58.77 | 54.48 | 45.12 | 41.00 | 52.00 | |||||||||||||
| 1960 | 37.48 | 42.76 | 45.60 | 49.65 | 52.94 | 59.75 | 65.85 | a | 63.48 | 59.97 | 53.95 | 45.38 | 39.94 | 51.40 | ||||||||||||
| 1961 | 44.10 | 46.77 | 47.15 | 48.32 | 55.21 | 63.30 | 65.92 | 67.63 | 58.35 | 51.55 | 41.92 | 40.92 | 52.59 | |||||||||||||
| 1962 | 38.50 | 43.96 | 44.47 | 50.97 | 51.42 | 58.55 | 62.42 | 63.06 | 60.93 | 54.48 | 47.37 | 42.35 | 51.54 | |||||||||||||
| 1963 | 35.39 | 48.52 | 45.37 | 48.87 | 55.77 | 58.25 | 61.39 | 63.90 | 63.82 | 54.39 | 46.62 | 40.40 | 51.89 | |||||||||||||
| 1964 | 41.53 | 41.66 | 43.84 | 47.15 | 52.16 | 57.60 | 62.79 | 62.03 | 59.27 | 53.52 | 42.85 | 37.32 | 50.14 | |||||||||||||
| 1965 | 40.31 | 42.89 | 46.29 | 50.80 | 52.44 | 57.78 | 65.45 | 65.73 | 58.35 | 55.45 | 48.13 | 39.29 | 51.91 | |||||||||||||
| 1966 | 39.65 | 41.54 | 44.74 | 50.80 | 54.68 | 59.32 | 62.61 | 64.52 | 62.47 | 52.42 | 46.50 | 44.08 | 51.94 | |||||||||||||
| 1967 | 43.24 | 42.86 | 43.32 | 46.18 | 55.18 | 63.03 | 65.34 | 69.56 | 64.73 | 53.84 | 46.52 | 40.39 | 52.85 | |||||||||||||
| 1968 | 39.81 | 45.64 | 47.90 | 47.55 | 54.63 | 59.35 | 64.92 | 62.66 | 59.97 | 51.15 | 46.13 | 37.32 | 51.42 | |||||||||||||
| 1969 | 31.71 | 39.80 | 46.16 | 49.05 | 56.98 | 64.20 | 63.08 | 61.79 | 60.22 | 50.82 | 46.48 | 41.97 | 51.02 | |||||||||||||
| 1970 | 39.66 | 45.41 | 45.47 | 46.50 | 53.87 | 61.87 | 63.90 | 64.15 | 57.50 | 50.52 | 45.40 | 39.34 | 51.13 | |||||||||||||
| 1971 | 39.50 | 42.11 | 41.68 | 47.70 | 54.98 | 56.70 | 63.98 | 67.13 | 58.03 | 50.03 | 44.82 | 38.00 | 50.39 | |||||||||||||
| 1972 | 36.87 | 40.93 | 46.44 | 45.67 | 56.66 | 59.50 | 65.47 | 66.23 | 57.58 | 51.08 | 45.93 | 36.32 | 50.72 | |||||||||||||
| 1973 | 38.47 | 43.04 | 45.97 | 49.82 | 55.95 | 59.02 | 64.52 | 60.95 | 60.67 | 52.18 | 42.93 | 43.50 | 51.42 | |||||||||||||
| 1974 | 36.24 | 41.93 | 44.50 | 48.97 | 51.73 | 59.78 | a | 62.52 | 65.27 | 64.22 | 53.39 | ----- | z | 43.00 | 51.96 | |||||||||||
| 1975 | 40.15 | 40.66 | 43.39 | 45.03 | 54.27 | 58.40 | 64.21 | 61.23 | 62.30 | 52.31 | 44.52 | 41.45 | 50.66 | |||||||||||||
| 1976 | 41.18 | 40.91 | 42.18 | 47.80 | 54.39 | 57.15 | 62.53 | 61.92 | 60.98 | 52.89 | 46.42 | 39.95 | 50.69 | |||||||||||||
| 1977 | 36.61 | 44.38 | 43.18 | 50.50 | 52.18 | 60.15 | 61.45 | 67.84 | 58.80 | 52.45 | 43.42 | 42.03 | 51.08 | |||||||||||||
| 1978 | 41.98 | 44.70 | 48.76 | 50.08 | 53.44 | 62.67 | 64.68 | 64.50 | 59.57 | 54.37 | 39.53 | 36.55 | 51.74 | |||||||||||||
| 1979 | 31.77 | 40.82 | 47.97 | 50.45 | 56.24 | 60.67 | 65.34 | 64.40 | 63.65 | 55.69 | 44.12 | 44.13 | 52.10 | |||||||||||||
| 1980 | 34.89 | 42.29 | 45.05 | 52.00 | 54.74 | 58.08 | 65.11 | 62.60 | 60.58 | 54.60 | 46.97 | 43.44 | 51.70 | |||||||||||||
| 1981 | 43.37 | 43.54 | 48.13 | 50.17 | 54.79 | 58.77 | 63.97 | 68.26 | 62.32 | 52.13 | 47.03 | 41.81 | 52.86 | |||||||||||||
| 1982 | 37.81 | 41.75 | 44.77 | 46.95 | 55.08 | 62.08 | 63.26 | 64.60 | 61.58 | 53.56 | 42.62 | 40.32 | 51.20 | |||||||||||||
| 1983 | 42.94 | 46.32 | 49.03 | 50.60 | 57.98 | 59.57 | 63.03 | 65.42 | 58.43 | 51.79 | 48.18 | 35.18 | 52.37 | |||||||||||||
| 1984 | 41.71 | 43.78 | 48.63 | 48.27 | 53.03 | 57.97 | ----- | z | 64.29 | 60.33 | 50.65 | 45.02 | 36.92 | 50.05 | ||||||||||||
| 1985 | 35.89 | 38.86 | 43.55 | 51.15 | 55.31 | 59.52 | 67.73 | 64.55 | 58.23 | 51.71 | 36.58 | 34.35 | 49.79 | |||||||||||||
| 1986 | 42.71 | 43.02 | 50.13 | 48.98 | 55.02 | 63.08 | 61.92 | 67.71 | 59.57 | 55.35 | 46.33 | 40.44 | 52.85 | |||||||||||||
| 1987 | 39.77 | 45.12 | 47.71 | 52.25 | 57.82 | 61.48 | 63.40 | 65.48 | 63.23 | 56.03 | 48.03 | 38.76 | 53.26 | |||||||||||||
| 1988 | 39.24 | 44.05 | 46.16 | 50.70 | 54.60 | 59.10 | 64.08 | 63.94 | 60.07 | 56.47 | 46.48 | 41.00 | 52.16 | |||||||||||||
| 1989 | 41.10 | 35.16 | 44.00 | 53.47 | 56.08 | 61.87 | 62.50 | 63.65 | 63.05 | 53.76 | 47.23 | 41.44 | 51.94 | |||||||||||||
| 1990 | 42.02 | 39.71 | 48.29 | 52.87 | 54.94 | 59.90 | 66.74 | 66.37 | 63.85 | 51.37 | 46.42 | 33.94 | 52.20 | |||||||||||||
| 1991 | 38.58 | 48.07 | 44.21 | 49.42 | 53.16 | 57.75 | 65.48 | 66.10 | 63.10 | 53.53 | 46.43 | 41.68 | 52.29 | |||||||||||||
| 1992 | 43.45 | 48.00 | 51.23 | 52.62 | 58.63 | 63.62 | 66.65 | 66.02 | 59.63 | 54.81 | 45.18 | 39.34 | 54.10 | |||||||||||||
| 1993 | 35.71 | 39.98 | 47.26 | 50.38 | 59.60 | 60.50 | 61.61 | 65.15 | 62.10 | 55.66 | 40.30 | 40.45 | 51.56 | |||||||||||||
| 1994 | 44.39 | 39.43 | 49.50 | 51.92 | 57.10 | 59.32 | 65.34 | 65.32 | 63.60 | 51.61 | 41.50 | 41.45 | 52.54 | |||||||||||||
| 1995 | 43.24 | 45.62 | 47.03 | 49.10 | 57.97 | 60.98 | 66.32 | 63.18 | 64.52 | 53.16 | 49.13 | 42.02 | 53.52 | |||||||||||||
| 1996 | 41.81 | 41.91 | 46.71 | 51.67 | ----- | z | 59.03 | 67.13 | 65.52 | 58.63 | 51.77 | 44.68 | 41.42 | 51.84 | ||||||||||||
| 1997 | 40.53 | 43.02 | 45.65 | 49.48 | 58.76 | ----- | z | 64.47 | 67.63 | ----- | z | 52.76 | 48.93 | 40.60 | 51.18 | |||||||||||
| 1998 | 42.76 | 46.29 | 47.87 | 49.95 | 54.85 | 61.00 | 67.74 | 65.87 | 63.68 | 53.31 | 48.18 | 39.95 | 53.45 | |||||||||||||
| 1999 | 41.54 | r | ----- | z | 44.43 | x | 49.00 | 52.58 | a | 57.98 | a | 63.11 | 66.32 | 62.07 | 53.60 | 48.85 | 43.06 | 55.18 | ||||||||
| 2000 | 39.81 | 43.53 | 45.05 | 52.60 | 56.23 | 61.70 | 65.40 | 64.66 | 61.37 | 53.44 | 42.15 | 39.68 | 52.13 | |||||||||||||
| 2001 | 40.87 | 41.46 | 46.47 | 47.83 | 56.92 | 58.75 | ----- | z | 66.15 | a | 61.74 | a | ----- | z | 47.57 | 40.98 | 50.87 | |||||||||
| 2002 | 41.03 | 43.50 | 43.44 | 50.88 | 53.81 | ----- | z | 66.79 | 66.11 | 62.70 | 53.95 | 47.50 | 43.29 | 52.09 | ||||||||||||
| 2003 | 45.11 | ----- | z | 48.06 | 50.73 | 55.92 | 63.67 | 67.74 | 66.79 | 64.10 | 57.31 | 43.33 | 42.08 | 54.99 | ||||||||||||
| 2004 | 38.68 | 45.10 | 49.45 | 54.03 | 58.37 | 63.32 | 68.87 | 68.77 | 61.25 | 55.76 | 45.48 | 42.85 | 54.33 | |||||||||||||
| 2005 | 42.61 | 43.02 | 50.81 | 51.70 | 59.68 | 60.67 | 67.50 | 67.79 | 60.00 | 55.35 | 44.15 | 40.81 | 53.67 | |||||||||||||
| 2006 | 45.42 | 42.29 | 47.21 | 53.37 | 58.53 | 63.93 | 68.23 | 66.15 | 63.72 | 54.00 | 45.82 | 40.37 | 54.09 | |||||||||||||
| 2007 | 38.54 | f | 44.59 | 50.56 | 51.88 | 57.32 | 61.77 | 68.31 | 66.45 | 61.48 | 52.52 | 45.42 | 44.50 | z | 56.03 | |||||||||||
| 2008 | 36.95 | k | 44.55 | 44.79 | 48.43 | 58.24 | 59.52 | 66.40 | 67.35 | 63.53 | 53.82 | 49.20 | 37.76 | 53.96 | ||||||||||||
| 2009 | 39.65 | 41.68 | 44.40 | 51.17 | 57.66 | 63.47 | 70.23 | 67.44 | 64.13 | 53.69 | 47.12 | 36.16 | 53.07 | |||||||||||||
| 2010 | 45.95 | 47.43 | 48.74 | 50.63 | 54.44 | 59.60 | 65.39 | 66.48 | 63.25 | 55.11 | 45.17 | 42.92 | 53.76 | |||||||||||||
| 2011 | 41.90 | 40.23 | 46.16 | 46.98 | 53.58 | 60.27 | 64.44 | 67.18 | 65.68 | 54.26 | 44.43 | 39.40 | 52.04 | |||||||||||||
| 2012 | 40.60 | 43.33 | 44.84 | 53.25 | 56.61 | 60.22 | 65.66 | 68.24 | 64.07 | 54.12 | a | 47.88 | b | 42.13 | a | 53.41 | ||||||||||
| 2013 | 37.78 | a | 43.63 | a | 47.83 | a | 57.00 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 43.08 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 39.16 | 42.37 | 45.82 | 50.02 | 55.42 | 60.11 | 64.56 | 64.86 | 61.09 | 53.28 | 45.10 | 40.42 | 51.78 | |||||||||||||
| S.D. | 4.06 | 3.00 | 2.53 | 2.22 | 2.14 | 1.97 | 2.05 | 1.88 | 2.12 | 1.79 | 2.65 | 2.52 | 1.19 | |||||||||||||
| SKEW | -1.03 | -0.43 | 0.11 | 0.04 | 0.15 | 0.44 | 0.30 | 0.17 | -0.03 | -0.04 | -0.61 | -0.55 | 0.43 | |||||||||||||
| MAX | 46.18 | 48.52 | 51.23 | 55.65 | 59.81 | 64.65 | 70.23 | 69.56 | 65.68 | 57.31 | 50.25 | 45.23 | 54.49 | |||||||||||||
| MIN | 25.58 | 34.00 | 39.66 | 45.03 | 51.42 | 56.30 | 60.03 | 60.95 | 56.00 | 49.00 | 36.58 | 33.94 | 49.37 | |||||||||||||
| NO YRS | 85 | 86 | 87 | 87 | 86 | 84 | 86 | 88 | 87 | 86 | 87 | 87 | 75 | |||||||||||||