| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1928 | 40.98 | 49.88 | 57.60 | 59.32 | 71.71 | 75.35 | 76.68 | 74.66 | 70.05 | 60.37 | 51.17 | 42.85 | 60.88 | |||||||||||||
| 1929 | 41.84 | c | 47.62 | d | 50.77 | e | 55.13 | d | 67.20 | d | 73.16 | e | 78.81 | d | 79.93 | d | 72.69 | d | 67.26 | d | 52.88 | d | 48.33 | e | 61.30 | |
| 1930 | 43.05 | c | 52.72 | c | 53.90 | e | 58.52 | d | 61.48 | c | 74.48 | e | 79.07 | c | 78.94 | e | 69.13 | d | 62.20 | d | 53.20 | e | 42.90 | e | 60.80 | |
| 1931 | 45.98 | d | 57.52 | c | 54.50 | e | 62.45 | j | 71.46 | e | 69.85 | d | 83.20 | c | 81.65 | d | 68.63 | d | 63.26 | d | 51.29 | d | 45.14 | c | 62.95 | |
| 1932 | 42.85 | d | 47.96 | d | 54.86 | c | 57.73 | d | 67.77 | e | 75.44 | d | 77.67 | b | 77.28 | b | 75.52 | d | 62.87 | d | 55.96 | d | 40.20 | d | 61.34 | |
| 1933 | 40.69 | d | 45.73 | d | 53.48 | d | 59.00 | c | 60.22 | d | 70.25 | d | 82.63 | e | 80.19 | d | 70.12 | d | 69.69 | e | 54.56 | c | 45.25 | c | 60.98 | |
| 1934 | 44.09 | d | 52.30 | c | 60.88 | b | 67.29 | d | 70.47 | b | 73.35 | d | 79.27 | a | 80.64 | b | 74.43 | b | 64.78 | a | 53.48 | 45.48 | a | 63.87 | ||
| 1935 | 45.00 | a | 48.70 | a | 49.16 | 58.63 | 67.84 | i | 76.04 | b | 76.86 | b | 79.84 | f | 73.87 | 60.60 | 48.53 | 45.45 | a | 58.28 | ||||||
| 1936 | 48.10 | e | 48.71 | a | 54.30 | c | 59.70 | 68.37 | 75.13 | 82.15 | 79.74 | 73.55 | 64.11 | 53.08 | 43.08 | 62.50 | ||||||||||
| 1937 | 39.18 | 49.12 | 53.08 | 56.42 | 67.73 | 74.02 | 81.29 | 78.42 | 71.22 | 63.95 | 54.27 | 48.61 | 61.44 | |||||||||||||
| 1938 | 44.71 | 51.20 | 52.11 | 59.47 | 68.05 | 76.18 | 80.77 | 77.98 | 74.88 | 62.45 | 50.73 | 48.65 | 62.27 | |||||||||||||
| 1939 | 46.10 | 47.12 | 55.34 | 65.07 | 67.84 | 74.40 | 80.71 | 79.37 | 75.30 | 64.27 | 56.02 | 50.94 | 63.54 | |||||||||||||
| 1940 | 49.10 | 54.67 | 58.74 | 63.33 | 71.23 | 78.05 | 77.92 | 77.61 | 70.10 | 64.66 | 52.50 | 51.79 | 64.14 | |||||||||||||
| 1941 | 51.08 | 54.73 | 57.85 | 58.10 | 67.55 | 71.58 | 81.53 | 75.26 | 69.38 | 61.13 | 55.30 | 49.35 | 62.74 | |||||||||||||
| 1942 | 48.37 | 49.46 | 54.82 | 59.43 | 63.53 | 73.20 | 80.52 | 78.26 | 71.13 | 64.71 | 53.20 | 46.55 | 61.93 | |||||||||||||
| 1943 | 46.71 | 52.64 | 57.12 | a | 61.73 | 67.60 | 69.22 | 77.56 | 74.02 | 74.08 | 63.42 | 54.60 | 49.10 | 62.32 | ||||||||||||
| 1944 | 48.10 | 50.07 | 55.23 | 57.43 | 67.15 | 69.42 | 76.81 | 75.85 | 73.93 | 66.17 | a | 52.22 | 47.33 | b | 61.64 | |||||||||||
| 1945 | 44.10 | 50.71 | 51.10 | 59.37 | 65.27 | 73.43 | 81.77 | c | 76.47 | 73.38 | 64.05 | b | 52.30 | 47.37 | 61.61 | |||||||||||
| 1946 | 43.77 | 46.98 | 53.50 | 62.28 | 67.21 | 72.80 | 79.26 | 78.23 | 72.82 | 60.92 | 49.38 | 45.53 | 61.06 | |||||||||||||
| 1947 | 40.56 | 50.71 | 57.34 | 63.50 | a | 71.98 | a | 75.00 | 77.02 | 75.58 | 74.83 | 62.85 | 49.00 | 43.94 | 61.86 | |||||||||||
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 78.87 | 76.82 | 70.73 | h | 63.89 | 51.47 | 43.06 | 62.82 | ||||||
| 1949 | 38.39 | 46.12 | 52.68 | 63.67 | 67.11 | 77.54 | d | 79.56 | f | 73.79 | 72.58 | 62.85 | 57.00 | 43.97 | 59.61 | |||||||||||
| 1950 | 41.82 | 51.00 | 52.60 | 62.67 | 67.50 | 72.72 | 81.39 | 77.06 | 72.25 | 58.38 | z | 57.60 | 50.40 | 62.46 | ||||||||||||
| 1951 | 45.03 | 48.84 | 52.19 | 60.22 | 66.33 | b | 71.95 | a | 77.54 | f | 76.77 | p | ----- | z | ----- | z | 55.05 | a | 45.94 | 55.69 | ||||||
| 1952 | 45.74 | 51.33 | 52.28 | b | 60.90 | 71.58 | a | 71.02 | 80.05 | j | 76.50 | e | 75.38 | a | 67.40 | 52.07 | 47.79 | 61.09 | ||||||||
| 1953 | 50.60 | k | 49.09 | 53.92 | 59.53 | ----- | z | 69.73 | 80.92 | 74.77 | 74.85 | 62.89 | 54.60 | 46.27 | 62.66 | |||||||||||
| 1954 | 47.31 | 50.16 | 53.03 | 64.88 | 70.98 | 72.93 | a | 81.69 | 75.21 | 71.58 | 64.05 | a | 52.48 | 44.63 | 62.41 | |||||||||||
| 1955 | 42.35 | 48.11 | 54.21 | 55.88 | 67.48 | 74.46 | e | 77.40 | 80.63 | 74.40 | 65.95 | 51.10 | 49.30 | a | 61.77 | |||||||||||
| 1956 | 48.74 | 46.83 | 55.15 | 60.68 | 67.63 | 76.31 | a | 79.76 | 76.73 | c | 74.67 | 62.60 | 53.20 | 45.11 | 62.28 | |||||||||||
| 1957 | 43.11 | 54.61 | 56.03 | 61.18 | 66.14 | c | 77.78 | 80.97 | 76.66 | 74.08 | 61.76 | 52.25 | 45.26 | 62.49 | ||||||||||||
| 1958 | 45.94 | f | 53.98 | 52.53 | 60.12 | 71.06 | 74.08 | 80.23 | 83.58 | 76.68 | 70.39 | 55.17 | 50.55 | 66.22 | ||||||||||||
| 1959 | 49.76 | 49.50 | 58.53 | 65.68 | 67.31 | 77.42 | 83.44 | 78.95 | a | 71.22 | 67.61 | 55.82 | 47.11 | 64.36 | ||||||||||||
| 1960 | 45.61 | 49.72 | 56.87 | 61.07 | 66.47 | 81.53 | 84.76 | 80.08 | 75.70 | 63.90 | 52.22 | 44.45 | 63.53 | |||||||||||||
| 1961 | 41.66 | 51.96 | a | 54.50 | 63.13 | 64.56 | 78.82 | 83.52 | 81.29 | 72.73 | 65.39 | 52.15 | 44.31 | 62.84 | ||||||||||||
| 1962 | 40.85 | 46.54 | 51.37 | 63.80 | 64.58 | 74.57 | 79.85 | 77.73 | 72.90 | 63.18 | 55.53 | 47.26 | 61.51 | |||||||||||||
| 1963 | 41.94 | 56.22 | a | 53.29 | 55.67 | 66.92 | 71.30 | 76.29 | 77.35 | 73.68 | 66.46 | q | 46.30 | t | 39.53 | 61.22 | ||||||||||
| 1964 | 43.97 | 48.29 | 52.02 | 59.32 | 63.95 | 72.12 | 79.65 | 78.87 | a | 70.05 | 68.24 | 50.62 | a | 49.58 | 61.39 | |||||||||||
| 1965 | 45.84 | 48.76 | a | 54.65 | 59.07 | 66.18 | 70.15 | ----- | z | 78.84 | 68.68 | 66.66 | 55.27 | 41.74 | 59.62 | |||||||||||
| 1966 | 44.39 | 47.45 | 55.58 | 64.27 | ----- | z | 74.77 | 76.82 | 80.66 | 72.58 | 65.08 | 55.91 | a | 45.05 | a | 62.05 | ||||||||||
| 1967 | 45.34 | 48.38 | 53.69 | 51.67 | 67.84 | 71.77 | 83.29 | 83.65 | 76.47 | 65.66 | 57.72 | 43.10 | 62.38 | |||||||||||||
| 1968 | 43.66 | 54.88 | 56.02 | 61.33 | 66.52 | 76.35 | 81.30 | a | 75.27 | 73.05 | 63.68 | 52.38 | 43.65 | 62.34 | ||||||||||||
| 1969 | 45.23 | 47.89 | 53.19 | 59.35 | 69.31 | 71.77 | 80.95 | 80.74 | 76.83 | 61.05 | 55.07 | 47.55 | 62.41 | |||||||||||||
| 1970 | 49.50 | 52.41 | 55.11 | 56.55 | 69.47 | b | 74.85 | 82.63 | 79.00 | 73.45 | 63.53 | 55.43 | a | 46.85 | 63.23 | |||||||||||
| 1971 | 45.06 | 46.75 | 52.95 | 57.73 | 63.58 | 72.93 | 81.23 | 81.18 | 73.63 | 61.69 | 51.25 | b | 42.58 | g | 62.54 | |||||||||||
| 1972 | 40.23 | e | 50.46 | b | 59.79 | b | 60.42 | 69.15 | a | 77.02 | 81.05 | 78.00 | 70.90 | 63.74 | 50.83 | 41.10 | 61.89 | |||||||||
| 1973 | 45.47 | 51.79 | 51.15 | a | 61.07 | 71.85 | 78.38 | 79.86 | b | 78.48 | 72.00 | 63.45 | 51.75 | 45.69 | g | 64.11 | ||||||||||
| 1974 | 46.35 | 48.12 | 54.55 | 58.23 | 68.39 | 76.20 | 79.56 | 78.95 | a | 76.68 | 66.40 | 51.89 | b | 44.37 | 62.48 | |||||||||||
| 1975 | 42.82 | 49.02 | 51.68 | 53.52 | b | 67.10 | 74.00 | 77.27 | 75.19 | 73.17 | 59.84 | b | 47.75 | 43.21 | 59.55 | |||||||||||
| 1976 | 43.71 | 49.64 | a | 50.93 | c | 55.52 | 69.22 | b | 72.23 | 79.42 | 72.27 | 71.22 | a | 63.60 | 53.52 | 44.02 | 60.44 | |||||||||
| 1977 | 42.05 | 51.88 | 51.45 | 62.32 | b | 60.79 | 75.93 | 77.92 | 75.58 | 70.92 | 63.94 | 53.08 | 49.82 | 61.31 | ||||||||||||
| 1978 | 49.98 | 50.46 | 58.16 | 58.86 | a | 66.52 | 72.93 | 78.37 | a | 75.40 | a | 68.96 | e | 66.47 | 50.38 | 40.77 | 61.44 | |||||||||
| 1979 | 45.58 | a | 47.71 | 54.90 | 59.63 | 69.37 | 75.80 | 78.56 | 76.61 | 75.90 | 66.02 | 51.98 | 47.03 | 62.43 | ||||||||||||
| 1980 | 49.97 | b | ----- | z | 53.37 | a | ----- | z | 62.74 | n | ----- | z | 80.19 | ----- | z | 71.77 | 65.18 | 53.17 | 46.44 | e | 60.01 | |||||
| 1981 | 49.34 | 51.41 | f | 53.48 | 61.33 | 69.35 | 80.78 | 79.63 | h | 79.87 | e | 75.74 | m | 58.61 | 54.97 | 47.47 | a | 61.69 | ||||||||
| 1982 | 42.27 | 50.36 | 52.77 | 58.28 | 66.79 | 71.15 | 78.60 | 78.10 | 69.82 | 62.34 | 49.25 | 44.66 | 60.37 | |||||||||||||
| 1983 | 43.19 | 51.62 | 54.79 | 56.78 | 67.06 | 72.83 | 75.74 | 79.13 | 75.23 | 65.58 | 53.15 | 49.24 | 62.03 | |||||||||||||
| 1984 | 46.11 | 49.03 | 57.76 | 58.68 | 71.87 | 73.88 | 82.37 | 78.85 | 76.52 | 58.73 | 51.87 | 43.76 | 62.45 | |||||||||||||
| 1985 | 39.90 | 47.96 | 50.61 | 63.92 | 65.26 | 76.08 | 80.32 | 74.65 | 69.57 | 61.10 | 50.63 | 41.21 | 60.10 | |||||||||||||
| 1986 | 50.42 | ----- | z | 58.24 | 60.82 | 68.21 | 76.10 | 78.69 | 80.16 | c | 67.68 | 63.31 | 53.85 | 44.23 | 63.79 | |||||||||||
| 1987 | 42.63 | 50.12 | 54.24 | 65.48 | 70.60 | 75.93 | 74.89 | 77.40 | 73.42 | 68.37 | 52.37 | 44.47 | 62.49 | |||||||||||||
| 1988 | 45.77 | 51.50 | 55.97 | 60.83 | 65.85 | 73.62 | 82.81 | 78.48 | 73.82 | 67.10 | 53.12 | 43.56 | 62.70 | |||||||||||||
| 1989 | 41.76 | 47.27 | 56.65 | 64.83 | 67.85 | 74.30 | 79.32 | 76.15 | 71.87 | 63.05 | 52.53 | 41.90 | 61.46 | |||||||||||||
| 1990 | 44.60 | 46.61 | 55.61 | 63.90 | 66.35 | 74.32 | 81.50 | 78.76 | 73.78 | 65.94 | 52.08 | 40.32 | 61.98 | |||||||||||||
| 1991 | 45.74 | 53.98 | 51.19 | 58.25 | 65.68 | 72.20 | 80.90 | 76.03 | 77.15 | 68.94 | 54.28 | 44.42 | 62.40 | |||||||||||||
| 1992 | 40.45 | 53.97 | 57.48 | 64.08 | 72.90 | 74.58 | 78.31 | 80.76 | 74.47 | 66.87 | 52.65 | 43.18 | 63.31 | |||||||||||||
| 1993 | 44.85 | 50.34 | 57.92 | 59.38 | 67.90 | 73.37 | 77.19 | 77.13 | 73.13 | 65.84 | 52.85 | 44.16 | 62.01 | |||||||||||||
| 1994 | 45.10 | 48.23 | 57.58 | 61.32 | 66.63 | 74.87 | 79.87 | 79.35 | 73.62 | 62.68 | 46.72 | a | 43.08 | 61.59 | ||||||||||||
| 1995 | 50.63 | 51.54 | 54.55 | 58.58 | 64.92 | 71.55 | 78.15 | 78.85 | 74.68 | 65.32 | 57.92 | 49.47 | 63.01 | |||||||||||||
| 1996 | 47.16 | 53.67 | 55.77 | 61.70 | 68.34 | 75.03 | 82.35 | 80.97 | 71.75 | 62.32 | 52.60 | 47.72 | a | 63.28 | ||||||||||||
| 1997 | 48.66 | 50.59 | 57.61 | q | 61.90 | 73.05 | 74.82 | k | 78.97 | 79.31 | 75.78 | 63.16 | 56.17 | 43.90 | 63.15 | |||||||||||
| 1998 | 47.97 | 48.96 | 55.05 | 57.43 | 61.48 | 71.05 | 80.39 | 81.05 | 74.18 | 61.03 | 51.40 | 41.92 | 60.99 | |||||||||||||
| 1999 | 44.20 | f | 48.52 | 52.24 | 56.14 | a | 65.73 | i | 72.18 | 76.97 | 75.58 | a | 73.95 | 66.52 | 54.57 | 44.65 | 62.13 | |||||||||
| 2000 | 48.33 | k | 52.84 | 53.45 | j | 62.17 | 68.61 | 77.59 | a | 76.11 | 78.74 | 72.87 | 62.98 | 48.17 | 46.23 | a | 64.63 | |||||||||
| 2001 | 44.15 | a | 48.45 | 56.55 | l | 57.38 | i | 74.18 | a | 77.23 | 78.48 | a | ----- | z | 73.94 | n | 67.22 | m | 53.22 | n | 45.50 | n | 64.50 | |||
| 2002 | 43.47 | l | 49.07 | m | 53.10 | k | 61.36 | h | 65.18 | i | 77.17 | l | 80.68 | l | ----- | z | 74.75 | n | 62.59 | i | 54.97 | l | 47.05 | j | 9999.00 | |
| 2003 | 48.30 | k | 47.87 | i | ----- | z | 57.52 | h | 66.77 | 74.98 | 83.10 | 77.61 | 75.68 | 66.95 | 48.78 | 47.42 | 67.66 | |||||||||
| 2004 | 44.76 | 48.95 | 59.29 | 62.38 | 67.97 | 74.53 | 79.82 | 77.63 | 72.42 | 61.50 | 50.07 | 43.53 | 61.90 | |||||||||||||
| 2005 | 45.55 | 52.05 | 55.45 | 57.68 | 67.26 | ----- | z | 82.58 | 79.55 | 69.63 | 62.68 | 54.60 | ----- | z | 62.70 | |||||||||||
| 2006 | 47.44 | 49.66 | 48.66 | 58.37 | 69.16 | 75.00 | l | 83.98 | 76.13 | 72.17 | 60.55 | 53.27 | 44.21 | g | 61.94 | |||||||||||
| 2007 | 41.58 | 49.57 | ----- | z | 60.78 | 68.69 | 74.90 | 79.18 | 79.55 | 71.35 | 60.89 | d | 53.82 | 43.48 | 62.16 | |||||||||||
| 2008 | 45.47 | 48.36 | 54.29 | 58.46 | p | 67.55 | 75.18 | 79.94 | 80.21 | 73.48 | 64.25 | s | 54.70 | h | 43.74 | 63.14 | ||||||||||
| 2009 | 45.53 | 51.16 | 53.65 | 59.68 | 71.97 | 73.22 | l | 81.61 | i | 79.05 | 77.00 | a | 60.69 | 50.93 | 45.02 | 59.47 | ||||||||||
| 2010 | 47.27 | 50.77 | 53.63 | a | 55.97 | 62.68 | 76.67 | o | 80.19 | 77.03 | 73.70 | 65.77 | 51.52 | 49.45 | 60.73 | |||||||||||
| 2011 | 45.19 | 47.91 | a | 53.89 | 59.30 | 63.88 | a | 72.36 | b | 80.21 | s | 78.81 | 76.54 | c | 65.24 | 51.12 | 42.90 | 59.74 | ||||||||
| 2012 | 46.55 | 50.67 | 54.74 | 60.90 | 68.48 | g | 74.52 | h | 77.74 | 81.08 | e | 74.78 | l | 65.16 | 55.43 | 48.68 | 60.11 | |||||||||
| 2013 | 44.08 | 48.07 | 58.61 | 61.25 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 40.00 | z | 50.25 | ||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 44.94 | 50.12 | 54.53 | 60.13 | 67.63 | 74.21 | 79.83 | 78.15 | 73.08 | 64.04 | 52.84 | 45.45 | 62.05 | |||||||||||||
| S.D. | 2.93 | 2.48 | 2.52 | 2.97 | 2.86 | 2.53 | 2.19 | 2.24 | 2.29 | 2.48 | 2.34 | 2.79 | 0.99 | |||||||||||||
| SKEW | 0.06 | 0.67 | 0.19 | -0.09 | -0.24 | 0.29 | 0.02 | -0.10 | -0.27 | 0.17 | -0.13 | 0.18 | -0.03 | |||||||||||||
| MAX | 51.08 | 57.52 | 60.88 | 67.29 | 74.18 | 81.53 | 84.76 | 83.65 | 77.15 | 70.39 | 57.92 | 51.79 | 64.36 | |||||||||||||
| MIN | 38.39 | 45.73 | 48.66 | 51.67 | 60.22 | 69.22 | 74.89 | 72.27 | 67.68 | 58.61 | 46.72 | 39.53 | 59.55 | |||||||||||||
| NO YRS | 79 | 80 | 79 | 78 | 77 | 76 | 77 | 80 | 79 | 79 | 81 | 79 | 54 | |||||||||||||