| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1928 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 61.50 | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1929 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1930 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1931 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1932 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1933 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1934 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1935 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 40.75 | a | 40.75 | |
| 1936 | 44.29 | 36.59 | 45.40 | 53.73 | 59.44 | 62.62 | 65.48 | 64.63 | 59.68 | 54.44 | 41.23 | 41.18 | 52.39 | |||||||||||||
| 1937 | 29.34 | 38.30 | 45.98 | 46.27 | 54.13 | 60.80 | 64.32 | a | 63.08 | 60.20 | 54.94 | 47.27 | 41.76 | 50.53 | ||||||||||||
| 1938 | 39.16 | 40.29 | 43.89 | 49.57 | 54.98 | 60.93 | 67.00 | 62.05 | a | 64.05 | 53.40 | 42.03 | 40.24 | 51.47 | ||||||||||||
| 1939 | 41.13 | 38.70 | 45.34 | 50.73 | 55.61 | 57.57 | 65.68 | 65.47 | 61.68 | 53.08 | 45.17 | 43.23 | 51.95 | |||||||||||||
| 1940 | 39.42 | 44.71 | 47.60 | 51.02 | 57.16 | 61.78 | 64.32 | 66.05 | 62.82 | 55.03 | 42.85 | 41.94 | 52.89 | |||||||||||||
| 1941 | 40.92 | 44.32 | 49.03 | 50.78 | 54.90 | 59.10 | 68.23 | 65.19 | 58.17 | 51.65 | 45.30 | 41.39 | 52.41 | |||||||||||||
| 1942 | 35.58 | 41.27 | 43.29 | 48.93 | 53.55 | 57.30 | 65.89 | 66.53 | 61.48 | 53.65 | 44.15 | 42.73 | 51.20 | |||||||||||||
| 1943 | 33.24 | 42.29 | 43.68 | 50.77 | 52.31 | 57.93 | 64.10 | 63.05 | 63.03 | 53.26 | 44.20 | 38.66 | 50.54 | |||||||||||||
| 1944 | 37.26 | 40.69 | 43.24 | 47.62 | 53.26 | 58.45 | 64.69 | 63.84 | 62.82 | 55.34 | 43.37 | 37.95 | 50.71 | |||||||||||||
| 1945 | 41.02 | 42.75 | 41.53 | 47.38 | 56.40 | 58.83 | 65.39 | 64.76 | 58.52 | 52.34 | 44.43 | 40.52 | 51.16 | |||||||||||||
| 1946 | 38.53 | 41.36 | 44.10 | 48.70 | 56.00 | 57.88 | 65.06 | 65.71 | 59.60 | 49.21 | 42.20 | 41.27 | 50.80 | |||||||||||||
| 1947 | 35.68 | 44.23 | 47.55 | 51.78 | 58.29 | 59.00 | a | 62.97 | 61.92 | 61.83 | 53.61 | 46.12 | 41.10 | 52.01 | ||||||||||||
| 1948 | 41.00 | z | 39.41 | 41.48 | 45.42 | 53.98 | ----- | z | 60.78 | b | 60.31 | 58.36 | a | 50.16 | 42.15 | 35.56 | 48.76 | |||||||||
| 1949 | 28.92 | a | 39.25 | 46.93 | a | 52.95 | 57.65 | 63.65 | 65.95 | 64.16 | c | 61.71 | b | 49.34 | 45.30 | 39.76 | 51.30 | |||||||||
| 1950 | 28.92 | 41.13 | a | 43.33 | a | 47.38 | 54.47 | a | 59.33 | 63.82 | 65.56 | 60.82 | 50.15 | 45.03 | 45.56 | 50.46 | ||||||||||
| 1951 | 37.87 | 41.98 | 40.47 | a | 52.15 | 55.24 | 62.84 | a | 64.97 | b | 63.76 | 63.30 | 52.89 | 44.72 | 37.65 | a | 51.49 | |||||||||
| 1952 | 36.34 | 39.09 | 43.24 | 50.68 | 54.87 | 58.22 | c | 67.43 | d | 66.50 | h | 65.48 | 59.06 | 38.26 | k | 39.65 | 51.41 | |||||||||
| 1953 | 44.81 | 42.09 | 43.43 | a | 47.53 | 52.85 | 55.48 | 64.35 | 64.27 | 62.95 | 53.93 | c | 46.72 | 41.82 | 51.69 | |||||||||||
| 1954 | 38.77 | 42.73 | 43.27 | 49.17 | 56.05 | a | 57.13 | 61.76 | 61.97 | 59.24 | a | 51.65 | 48.48 | 40.11 | 50.86 | |||||||||||
| 1955 | 38.06 | 40.31 | a | 41.43 | a | 44.50 | 51.95 | a | 59.50 | 61.34 | b | 63.81 | 60.84 | a | 52.58 | 42.45 | 40.02 | 49.73 | ||||||||
| 1956 | 40.29 | 35.88 | 43.30 | a | 51.02 | 58.52 | a | 57.57 | b | 66.76 | 64.24 | 61.40 | 51.13 | 42.40 | 39.45 | 51.00 | ||||||||||
| 1957 | 32.31 | 42.52 | a | 46.29 | 50.15 | 57.02 | b | 61.13 | 63.32 | 62.82 | 65.80 | 52.40 | 43.22 | 43.06 | 51.67 | |||||||||||
| 1958 | 42.50 | 47.96 | 44.18 | 49.35 | 59.34 | 63.30 | 69.81 | 68.81 | 61.97 | 55.10 | 46.08 | 44.95 | 54.45 | |||||||||||||
| 1959 | 41.82 | 41.62 | 45.18 | a | 50.60 | 53.05 | 60.37 | 66.84 | 63.34 | 58.98 | 54.16 | 44.88 | 39.56 | 51.70 | ||||||||||||
| 1960 | 35.84 | 41.98 | 44.87 | 49.93 | 53.26 | 62.08 | 66.89 | 63.35 | 62.15 | 54.26 | 45.08 | 39.44 | 51.59 | |||||||||||||
| 1961 | 43.78 | a | 45.80 | 46.23 | 49.47 | 54.95 | 64.13 | 66.52 | 68.56 | 58.93 | 53.35 | 42.18 | 40.26 | 52.85 | ||||||||||||
| 1962 | 36.68 | 41.45 | 42.85 | 51.23 | 51.18 | 59.35 | 63.95 | 63.23 | 59.03 | 50.62 | a | 47.05 | 43.73 | 50.86 | ||||||||||||
| 1963 | 34.32 | 47.96 | 44.84 | 48.15 | 55.56 | 59.47 | 62.58 | 65.92 | 64.22 | 53.32 | ----- | z | 39.66 | 52.36 | ||||||||||||
| 1964 | ----- | z | ----- | z | 42.85 | 48.50 | ----- | z | ----- | z | ----- | z | ----- | z | 60.20 | ----- | z | 42.47 | 41.11 | 47.03 | ||||||
| 1965 | 39.60 | 43.82 | 48.37 | 51.53 | 53.29 | 60.12 | 66.66 | 67.10 | 61.15 | 56.10 | 48.08 | 37.39 | 52.77 | |||||||||||||
| 1966 | 41.06 | 41.80 | 44.69 | 50.28 | 56.40 | 61.12 | 64.52 | 65.77 | 62.37 | 53.02 | 47.73 | 43.39 | 52.68 | |||||||||||||
| 1967 | 43.35 | 43.59 | 44.03 | 45.13 | 55.16 | 63.98 | 66.10 | 70.92 | 65.57 | 53.17 | b | 43.98 | ----- | z | 54.09 | |||||||||||
| 1968 | 39.68 | 47.91 | 47.56 | 47.77 | 54.29 | 60.67 | 66.05 | 63.40 | 60.88 | 51.16 | c | 45.50 | 38.39 | 51.94 | ||||||||||||
| 1969 | 34.56 | 39.36 | 46.66 | 48.60 | 58.84 | b | 64.90 | 64.00 | 62.95 | 61.17 | 51.53 | 44.55 | 41.39 | 51.54 | ||||||||||||
| 1970 | 41.58 | 45.71 | 46.19 | 46.70 | 55.45 | 63.27 | 66.19 | 64.61 | 58.93 | 51.92 | 45.25 | 38.79 | 52.05 | |||||||||||||
| 1971 | 39.16 | 40.68 | 42.29 | 48.55 | 56.77 | 56.27 | 66.10 | 68.06 | 59.35 | 50.81 | 44.62 | 39.05 | 50.98 | |||||||||||||
| 1972 | 38.58 | 43.17 | 48.11 | 46.08 | 57.23 | 61.18 | 68.50 | 68.27 | 58.83 | 52.45 | 45.77 | 34.48 | 51.89 | |||||||||||||
| 1973 | 37.13 | 44.54 | 44.81 | 49.88 | 57.00 | 62.03 | 66.95 | 62.87 | 62.45 | 52.29 | 42.50 | 43.08 | 52.13 | |||||||||||||
| 1974 | 37.32 | 40.98 | 46.13 | 49.37 | 53.18 | 62.40 | a | 66.00 | 66.63 | a | 66.25 | 54.06 | 45.08 | 43.31 | 52.56 | |||||||||||
| 1975 | 42.00 | 42.02 | 43.98 | 46.03 | 55.60 | 59.32 | 64.90 | 62.66 | 64.13 | 53.13 | 44.30 | 42.76 | 51.74 | |||||||||||||
| 1976 | 41.74 | 41.43 | 44.37 | 48.20 | 55.42 | 58.60 | 64.18 | a | 62.82 | 63.45 | 53.34 | 46.85 | 38.37 | 51.56 | ||||||||||||
| 1977 | 37.97 | 44.52 | 44.13 | 50.98 | 52.10 | 61.87 | 65.10 | b | 69.81 | 59.58 | 52.47 | 42.20 | 41.58 | 51.86 | ||||||||||||
| 1978 | 39.94 | 44.11 | 49.15 | 49.85 | 54.32 | 63.03 | a | 65.74 | 65.06 | 58.75 | 54.21 | 38.87 | 34.82 | 51.49 | ||||||||||||
| 1979 | 32.76 | 42.82 | 48.79 | 51.63 | 57.60 | a | 62.92 | 70.76 | l | 65.45 | 63.33 | a | 56.22 | b | 43.12 | 42.72 | b | 51.58 | ||||||||
| 1980 | 35.79 | 42.86 | a | 44.98 | a | 51.67 | 54.84 | 56.98 | 66.26 | 62.45 | a | 61.75 | b | 53.77 | e | 46.35 | 41.85 | 51.63 | ||||||||
| 1981 | 41.06 | 42.59 | 46.39 | i | 49.50 | m | 53.90 | p | 58.73 | 65.05 | c | 64.35 | g | 61.79 | b | 51.11 | m | 45.30 | g | 41.60 | 51.80 | |||||
| 1982 | 37.05 | 41.09 | 44.65 | 46.82 | 56.00 | 63.27 | 64.32 | 64.65 | 62.03 | 54.29 | 42.80 | 40.82 | 51.48 | |||||||||||||
| 1983 | 43.58 | 46.18 | 48.95 | 50.73 | 57.52 | 59.98 | 62.98 | 66.89 | 59.43 | 53.05 | 48.18 | 35.03 | 52.71 | |||||||||||||
| 1984 | 42.68 | 44.67 | 49.58 | 48.23 | 54.06 | 59.08 | 66.60 | 65.52 | 60.98 | 51.29 | 45.52 | 38.16 | 52.20 | |||||||||||||
| 1985 | 37.31 | 39.18 | 42.95 | 52.13 | ----- | z | 61.68 | 69.87 | 64.92 | 59.05 | 52.18 | 38.08 | 34.13 | 50.13 | ||||||||||||
| 1986 | 43.69 | 43.70 | 50.44 | 48.85 | 56.50 | 65.10 | 63.40 | 69.71 | 58.87 | 55.00 | 44.80 | 40.23 | 53.36 | |||||||||||||
| 1987 | 39.37 | 43.89 | 47.34 | 53.60 | 58.23 | 64.37 | 64.37 | 67.63 | 63.85 | 58.47 | 46.45 | 38.10 | 53.80 | |||||||||||||
| 1988 | 38.47 | 44.40 | 46.45 | 51.25 | 53.79 | 59.30 | 66.39 | 65.90 | 62.10 | 57.21 | 45.33 | 39.29 | 52.49 | |||||||||||||
| 1989 | 41.21 | 36.02 | 44.73 | 53.85 | 55.39 | 62.45 | 64.23 | 64.42 | 65.32 | 52.85 | 45.70 | 37.55 | 51.98 | |||||||||||||
| 1990 | 41.34 | 39.82 | 47.03 | 52.00 | 54.47 | 61.35 | 68.40 | 67.79 | 65.08 | 51.16 | 46.68 | 34.58 | 52.48 | |||||||||||||
| 1991 | 39.05 | 47.30 | 44.26 | 49.05 | 52.50 | 58.08 | 66.94 | 67.06 | 66.15 | 55.44 | 46.80 | 40.81 | 52.79 | |||||||||||||
| 1992 | 42.92 | 48.45 | 51.58 | 53.37 | 59.97 | 64.38 | 67.56 | 68.95 | 61.80 | 55.76 | 45.13 | 38.30 | a | 54.85 | ||||||||||||
| 1993 | 36.02 | 39.43 | 48.60 | 50.48 | 59.21 | 59.93 | 62.37 | 67.05 | 63.75 | 56.71 | 39.63 | 39.89 | 51.92 | |||||||||||||
| 1994 | 43.77 | 42.30 | 49.73 | 52.47 | 57.82 | 58.88 | 68.48 | 65.61 | 65.23 | 52.24 | 40.58 | 41.94 | 53.26 | |||||||||||||
| 1995 | 43.74 | 46.25 | 47.21 | 50.27 | 58.18 | 63.17 | 68.61 | 64.97 | 65.50 | 53.35 | 50.73 | 41.66 | 54.47 | |||||||||||||
| 1996 | 40.97 | 42.91 | 49.13 | 53.02 | 52.97 | 59.65 | 69.55 | 67.45 | 59.65 | 52.52 | 44.13 | 40.50 | 52.70 | |||||||||||||
| 1997 | 40.23 | a | 42.93 | 46.13 | 49.67 | 60.26 | 60.08 | 65.63 | 69.44 | 63.95 | 51.81 | 47.45 | 38.50 | 53.01 | ||||||||||||
| 1998 | 42.34 | 44.61 | 46.53 | 49.42 | 54.29 | 60.63 | 68.90 | 67.90 | 64.28 | 52.48 | 46.60 | 38.44 | 53.04 | |||||||||||||
| 1999 | 40.53 | 41.93 | 43.94 | 50.08 | 53.68 | 59.02 | 64.69 | 66.97 | 63.27 | 54.39 | 48.32 | 41.85 | 52.39 | |||||||||||||
| 2000 | 40.08 | 43.26 | 44.45 | 52.75 | 55.92 | 63.07 | 65.55 | 65.24 | 63.03 | 54.37 | 41.26 | a | 39.87 | 52.40 | ||||||||||||
| 2001 | 40.73 | 42.57 | 47.62 | a | 48.10 | 57.60 | 58.98 | 64.77 | 66.90 | 63.48 | 53.37 | 46.76 | c | 41.15 | a | 52.67 | ||||||||||
| 2002 | 40.40 | 43.88 | 43.56 | 50.37 | 54.31 | 61.22 | 67.45 | 66.16 | 62.95 | 53.29 | 47.05 | 42.74 | 52.78 | |||||||||||||
| 2003 | 45.03 | 43.71 | 48.73 | 49.25 | 56.35 | 64.23 | 68.79 | 68.39 | 65.52 | 58.18 | 43.85 | 42.08 | 54.51 | |||||||||||||
| 2004 | 38.71 | 44.14 | 50.08 | 53.47 | 57.63 | 63.32 | 69.40 | 69.37 | 61.88 | 55.55 | 44.03 | 42.89 | 54.21 | |||||||||||||
| 2005 | 42.53 | 43.68 | 48.98 | 51.57 | 59.10 | 59.72 | 68.56 | 69.13 | 61.55 | 54.69 | 42.48 | 38.92 | 53.41 | |||||||||||||
| 2006 | 43.19 | 42.14 | 45.16 | 51.45 | 58.05 | 64.13 | 69.37 | 66.74 | 63.38 | 53.31 | 45.67 | 39.60 | 53.52 | |||||||||||||
| 2007 | 38.15 | 44.41 | 49.24 | 49.73 | 56.10 | 60.35 | 68.81 | 67.11 | 61.55 | 51.52 | 43.07 | 39.97 | 52.50 | |||||||||||||
| 2008 | 36.90 | 42.91 | 43.31 | 46.75 | 57.68 | 59.47 | 67.05 | 67.95 | 63.78 | 53.15 | 47.72 | 36.58 | 51.94 | |||||||||||||
| 2009 | 39.44 | 40.55 | 43.76 | 49.87 | 56.48 | 61.88 | 68.56 | 65.77 | 62.88 | 52.40 | 45.03 | 35.77 | 51.87 | |||||||||||||
| 2010 | 44.52 | 45.61 | 46.56 | 48.42 | 52.68 | 57.80 | 64.79 | 65.26 | 62.12 | 52.97 | 44.12 | 41.92 | 52.23 | |||||||||||||
| 2011 | 39.84 | 39.09 | 45.03 | 45.60 | 51.45 | 58.38 | 63.61 | 66.65 | 65.35 | 53.34 | 42.98 | 36.77 | 50.67 | |||||||||||||
| 2012 | 40.15 | 42.60 | 42.77 | 51.18 | 55.18 | 57.97 | 64.05 | 66.76 | 63.38 | 55.50 | 46.92 | 41.50 | 52.33 | |||||||||||||
| 2013 | 36.87 | 43.04 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 39.95 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 39.22 | 42.54 | 45.63 | 49.76 | 55.63 | 60.59 | 65.82 | 65.67 | 62.08 | 53.41 | 44.66 | 40.09 | 52.15 | |||||||||||||
| S.D. | 3.59 | 2.64 | 2.47 | 2.20 | 2.19 | 2.31 | 2.11 | 2.25 | 2.20 | 1.95 | 2.34 | 2.48 | 1.05 | |||||||||||||
| SKEW | -0.85 | -0.12 | 0.29 | -0.25 | 0.09 | 0.10 | 0.02 | 0.07 | 0.00 | 0.52 | -0.31 | -0.47 | 0.44 | |||||||||||||
| MAX | 45.03 | 48.45 | 51.58 | 53.85 | 60.26 | 65.10 | 69.87 | 70.92 | 66.25 | 59.06 | 50.73 | 45.56 | 54.85 | |||||||||||||
| MIN | 28.92 | 35.88 | 40.47 | 44.50 | 51.18 | 55.48 | 60.78 | 60.31 | 58.17 | 49.21 | 38.08 | 34.13 | 49.73 | |||||||||||||
| NO YRS | 76 | 77 | 76 | 76 | 74 | 75 | 75 | 74 | 77 | 75 | 74 | 77 | 69 | |||||||||||||