| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1936 | ----- | z | ----- | z | ----- | z | 55.50 | s | 56.23 | 59.52 | g | 62.11 | 63.77 | 58.33 | 52.68 | 42.17 | 43.11 | 54.06 | ||||||||
| 1937 | 32.03 | 39.29 | d | 48.11 | 46.92 | 57.36 | j | 64.23 | h | 67.16 | 66.55 | 63.33 | 58.81 | 50.93 | 45.69 | 51.88 | ||||||||||
| 1938 | 42.89 | 44.71 | 46.82 | 53.45 | a | 57.50 | 63.48 | 68.98 | 65.21 | 65.69 | a | 56.05 | 44.33 | 43.06 | 54.35 | |||||||||||
| 1939 | 42.95 | 42.62 | 50.19 | 54.82 | 58.23 | 60.92 | 67.87 | 68.11 | 65.53 | 56.58 | 49.70 | 47.25 | a | 55.40 | ||||||||||||
| 1940 | 42.81 | 48.21 | 52.08 | 54.37 | 59.87 | 65.45 | 66.66 | 69.21 | 64.32 | 58.74 | 45.93 | 43.37 | 55.92 | |||||||||||||
| 1941 | 44.34 | 47.38 | 51.89 | 52.70 | 56.77 | 60.42 | 70.02 | 66.08 | 60.28 | 55.39 | 49.34 | a | 43.25 | a | 54.82 | |||||||||||
| 1942 | 41.50 | 44.23 | 47.53 | 51.95 | 55.56 | 59.77 | 67.73 | 67.55 | 62.24 | a | 56.60 | 47.62 | 45.00 | a | 53.94 | |||||||||||
| 1943 | 37.77 | 47.00 | 48.00 | 54.03 | 54.61 | 60.13 | 66.61 | 65.32 | 64.79 | i | 55.81 | 48.68 | 41.77 | e | 52.70 | |||||||||||
| 1944 | 42.00 | 44.55 | 47.82 | 50.79 | a | 56.65 | 61.18 | 68.92 | 67.10 | 66.52 | 59.81 | 46.31 | a | 42.00 | 54.47 | |||||||||||
| 1945 | 44.55 | 46.71 | 45.90 | 50.92 | 58.16 | 61.88 | 69.71 | 67.81 | 63.47 | 55.66 | 47.62 | 44.85 | 54.77 | |||||||||||||
| 1946 | 42.90 | 44.88 | ----- | z | 51.11 | c | 59.17 | a | ----- | z | ----- | z | ----- | z | 58.94 | n | 51.32 | 44.66 | b | 42.44 | 48.07 | |||||
| 1947 | 38.65 | 47.41 | 50.48 | 53.95 | 59.95 | 60.28 | 64.52 | a | ----- | z | 61.50 | 56.37 | 47.93 | 42.00 | 53.00 | |||||||||||
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 65.85 | k | 66.93 | a | 63.23 | 59.04 | s | 45.95 | k | 39.10 | 56.42 | |||
| 1949 | 32.97 | 43.61 | 49.23 | 55.07 | 59.77 | 63.81 | a | 66.87 | 67.50 | 63.67 | 51.40 | 51.48 | a | 42.00 | 53.95 | |||||||||||
| 1950 | 33.56 | 43.27 | 46.23 | 49.90 | 55.61 | 62.23 | 68.42 | 70.89 | 64.40 | 53.65 | 49.53 | 50.00 | 53.97 | |||||||||||||
| 1951 | 43.06 | 46.04 | 44.53 | 55.27 | 58.23 | g | 65.15 | 67.68 | 66.79 | 65.23 | 55.56 | 48.63 | 41.32 | 54.48 | ||||||||||||
| 1952 | 40.82 | 45.05 | 46.06 | 52.87 | 56.77 | 59.47 | 67.71 | 66.69 | 65.15 | 58.56 | e | 41.28 | 43.06 | 53.63 | ||||||||||||
| 1953 | 47.66 | 45.25 | 47.03 | 51.43 | 54.55 | 57.72 | 66.40 | 66.10 | 64.53 | 57.34 | o | 51.00 | 44.76 | 54.22 | ||||||||||||
| 1954 | 43.23 | a | 47.52 | 45.31 | 52.45 | 57.00 | 58.60 | 64.18 | 64.10 | 62.32 | 55.18 | ----- | z | 45.81 | 54.15 | |||||||||||
| 1955 | 41.56 | ----- | z | ----- | z | 45.84 | e | 54.34 | 60.62 | 62.89 | 65.55 | 62.10 | 55.03 | 46.12 | 43.55 | 53.76 | ||||||||||
| 1956 | 42.23 | 39.17 | 45.61 | 52.22 | 58.66 | 59.88 | 68.00 | 65.90 | 62.65 | 52.65 | 44.10 | 43.06 | 52.84 | |||||||||||||
| 1957 | 38.16 | 45.36 | 47.98 | 52.82 | 59.21 | 63.28 | 64.10 | 63.92 | 65.08 | 54.06 | 44.00 | 44.11 | 53.51 | |||||||||||||
| 1958 | 44.47 | 49.02 | 46.35 | 51.47 | 61.52 | 64.62 | 71.21 | ----- | z | 62.73 | 56.56 | 49.17 | 47.60 | 54.97 | ||||||||||||
| 1959 | 45.10 | 43.84 | 47.82 | 53.45 | 55.68 | 61.98 | 68.66 | 66.39 | 60.12 | 56.71 | 46.25 | 42.60 | 54.05 | |||||||||||||
| 1960 | 40.31 | 44.05 | 49.37 | 52.20 | 54.63 | 64.43 | 68.65 | 65.47 | 63.80 | 55.47 | 46.45 | 42.37 | 53.93 | |||||||||||||
| 1961 | 44.26 | 47.95 | 47.87 | 51.22 | 55.48 | 65.48 | 68.06 | 70.34 | 59.68 | 54.06 | 43.87 | 42.89 | 54.26 | |||||||||||||
| 1962 | 38.85 | 44.25 | 46.66 | 54.43 | 53.37 | 61.58 | 66.76 | 66.16 | 64.72 | 54.95 | 49.25 | 43.69 | 53.72 | |||||||||||||
| 1963 | 36.58 | a | 51.54 | 47.31 | 49.40 | 57.29 | 61.32 | 63.95 | 67.21 | 66.77 | 56.32 | 47.42 | 42.18 | 53.94 | ||||||||||||
| 1964 | 42.81 | 43.55 | 46.50 | 49.63 | 53.71 | 59.72 | a | 66.44 | e | 64.92 | 60.87 | 57.82 | 44.48 | 42.40 | a | 52.74 | ||||||||||
| 1965 | 42.42 | 44.91 | 48.79 | 52.92 | 55.26 | 61.27 | 67.45 | 67.73 | 61.60 | 58.63 | 49.95 | 40.40 | 54.28 | |||||||||||||
| 1966 | 42.87 | 43.02 | 47.76 | 54.32 | 56.87 | 62.33 | 65.02 | 66.50 | 65.58 | 55.48 | 48.15 | 44.79 | 54.39 | |||||||||||||
| 1967 | 44.18 | 46.18 | 46.02 | 47.03 | 57.11 | 65.25 | 67.71 | 71.60 | 66.15 | 56.23 | 48.80 | 41.44 | 54.81 | |||||||||||||
| 1968 | 42.71 | 50.43 | 50.94 | 50.40 | 56.76 | 63.55 | 68.58 | 67.42 | g | 64.25 | 54.58 | 49.55 | 42.21 | 54.00 | ||||||||||||
| 1969 | 39.42 | 41.34 | 48.67 | a | 51.62 | 60.77 | a | 64.63 | 66.63 | a | 65.77 | 63.83 | a | 54.21 | 47.95 | 44.17 | a | 54.08 | ||||||||
| 1970 | 45.39 | 48.68 | 49.92 | 48.41 | a | 58.47 | a | 65.50 | 68.15 | a | 67.27 | 60.65 | 54.26 | 48.33 | 41.40 | 54.70 | ||||||||||
| 1971 | 40.81 | 44.11 | 45.55 | 50.23 | 56.16 | 59.45 | 67.60 | 68.95 | 61.12 | 53.40 | a | 46.42 | 40.82 | 52.88 | ||||||||||||
| 1972 | 40.63 | 46.33 | 51.56 | 48.90 | 58.13 | 63.15 | 70.73 | 69.71 | 61.30 | 53.97 | k | 49.38 | 38.58 | 54.40 | ||||||||||||
| 1973 | 41.02 | 48.38 | 46.63 | 52.80 | 58.50 | 64.12 | 68.52 | 65.65 | 66.19 | n | 55.71 | j | 45.28 | j | 46.88 | a | 54.72 | |||||||||
| 1974 | 41.71 | c | 44.64 | 49.10 | 51.85 | c | 59.38 | o | 65.50 | h | 69.10 | f | 70.55 | c | 70.73 | h | 56.00 | m | 47.78 | l | 46.65 | d | 50.75 | |||
| 1975 | 45.50 | c | 45.19 | b | 47.35 | a | 49.43 | p | 58.68 | l | 63.43 | g | 68.57 | b | 67.86 | f | 67.04 | f | 56.12 | n | 47.00 | u | 44.77 | g | 51.65 | |
| 1976 | 43.52 | e | 43.93 | g | 46.93 | c | 50.57 | b | 58.67 | a | 60.98 | c | 66.81 | d | 66.50 | d | 65.29 | k | 53.62 | n | 51.02 | e | 38.64 | b | 53.74 | |
| 1977 | 41.31 | b | 48.33 | b | 46.47 | b | 54.33 | c | 55.03 | b | 65.39 | c | 65.93 | h | 71.91 | c | 61.55 | i | 58.54 | r | 48.21 | d | 47.11 | 53.12 | ||
| 1978 | 46.27 | 47.46 | b | 52.34 | 53.28 | a | 56.98 | c | 67.50 | k | 67.73 | g | 67.88 | k | 60.10 | t | 61.80 | u | 41.73 | q | 37.38 | o | 51.27 | |||
| 1979 | 36.81 | m | 43.96 | o | 52.63 | 52.97 | 60.02 | 63.18 | 67.97 | 67.47 | 67.15 | 60.35 | 46.38 | 44.66 | 58.28 | |||||||||||
| 1980 | 40.13 | 48.03 | 47.69 | e | 53.93 | 56.35 | 59.62 | 68.60 | 66.40 | 65.18 | 55.53 | 48.66 | a | 44.63 | 54.56 | |||||||||||
| 1981 | 45.24 | 47.34 | 49.79 | 52.72 | 57.15 | 61.75 | 67.26 | 69.40 | 65.08 | 54.81 | 47.96 | c | 45.78 | f | 56.23 | |||||||||||
| 1982 | 40.59 | i | 44.84 | 47.44 | 49.75 | 57.79 | 64.80 | 65.65 | 67.19 | 63.50 | 56.29 | 47.03 | o | 40.72 | k | 57.47 | ||||||||||
| 1983 | 43.48 | 47.05 | 49.55 | 51.42 | 57.95 | b | 62.23 | 64.40 | 67.34 | 62.32 | 56.31 | 49.33 | 40.37 | 54.31 | ||||||||||||
| 1984 | 43.31 | 46.41 | 51.58 | 49.97 | a | 56.87 | 60.87 | 68.90 | 67.71 | 63.43 | 53.70 | a | 47.30 | 39.98 | 54.17 | |||||||||||
| 1985 | 39.89 | 43.54 | 45.37 | 54.45 | 56.39 | 64.13 | 70.24 | 67.26 | 60.70 | 54.02 | 41.23 | 37.50 | 52.89 | |||||||||||||
| 1986 | 45.89 | 47.98 | 54.02 | 52.12 | a | 59.06 | 66.77 | 65.53 | 70.65 | 61.37 | 59.18 | 49.87 | 43.92 | 56.36 | ||||||||||||
| 1987 | 42.76 | 46.62 | 49.82 | 55.85 | 59.90 | 64.45 | 65.17 | a | 69.15 | 64.62 | b | 59.13 | 50.05 | 42.19 | 55.81 | |||||||||||
| 1988 | 42.84 | 47.24 | 51.31 | 56.85 | 58.69 | 64.00 | 69.29 | 67.28 | a | 64.05 | 60.69 | 47.83 | 41.47 | 55.96 | ||||||||||||
| 1989 | 43.21 | 38.04 | 47.52 | 56.50 | 57.58 | 62.95 | 64.21 | 65.81 | 65.33 | 56.03 | 49.07 | 42.85 | 54.09 | |||||||||||||
| 1990 | 44.32 | 43.96 | 51.24 | 55.98 | 56.19 | 61.78 | 69.29 | 69.26 | 66.47 | 55.90 | 48.37 | 35.21 | 54.83 | |||||||||||||
| 1991 | 41.29 | 50.71 | 47.26 | 50.80 | 54.53 | 59.15 | 69.71 | 68.66 | 66.55 | 56.61 | 50.02 | 43.26 | 54.88 | |||||||||||||
| 1992 | 44.94 | 50.38 | 54.95 | 57.98 | 64.94 | 65.93 | 69.90 | 69.44 | 64.88 | 58.71 | 49.47 | 42.02 | 57.79 | |||||||||||||
| 1993 | 40.44 | 43.88 | 53.19 | 52.68 | 61.29 | 62.82 | 64.94 | 68.77 | 66.98 | 60.29 | 42.30 | 41.66 | 54.94 | |||||||||||||
| 1994 | 45.94 | 44.61 | 51.63 | 53.72 | 59.26 | 61.77 | 69.66 | 66.85 | 66.87 | 54.90 | 43.55 | 43.42 | 55.18 | |||||||||||||
| 1995 | 44.97 | 50.21 | 47.94 | 52.20 | 59.42 | 61.82 | 69.18 | 66.71 | 67.08 | 56.15 | 51.57 | 45.26 | 56.04 | |||||||||||||
| 1996 | 43.08 | 46.50 | 50.42 | 54.18 | 57.24 | 63.85 | 71.73 | 69.50 | 63.02 | 57.39 | 50.30 | 45.10 | 56.03 | |||||||||||||
| 1997 | 44.08 | 46.11 | 49.18 | 52.32 | 61.61 | 61.18 | 67.95 | 68.48 | 64.52 | 53.34 | 49.82 | 41.27 | 54.99 | |||||||||||||
| 1998 | 45.98 | 47.45 | 48.89 | 51.70 | 54.52 | 61.25 | 70.06 | 71.95 | 65.92 | 54.39 | 47.90 | 40.24 | 55.02 | |||||||||||||
| 1999 | 43.30 | a | 45.00 | 46.19 | 50.00 | 53.27 | 59.08 | 65.48 | 67.50 | 62.38 | 53.81 | 50.32 | 43.13 | a | 53.29 | |||||||||||
| 2000 | 42.42 | 46.98 | 48.37 | 55.53 | 57.52 | 64.30 | 66.65 | 67.40 | b | 64.33 | 55.63 | 44.90 | 44.79 | 54.90 | ||||||||||||
| 2001 | 44.13 | 44.43 | 49.02 | 50.52 | 59.71 | 61.09 | c | 66.26 | 66.69 | 63.25 | 55.19 | j | 49.20 | 42.87 | 54.29 | |||||||||||
| 2002 | 43.35 | 45.80 | 45.47 | 53.00 | 56.53 | 63.60 | 69.08 | 67.50 | 64.82 | k | 53.05 | 47.95 | 45.32 | 53.70 | ||||||||||||
| 2003 | 48.65 | 45.21 | 51.13 | 50.10 | 58.31 | 65.52 | 70.42 | 68.59 | h | 65.24 | c | 59.58 | 45.03 | 44.37 | 54.87 | |||||||||||
| 2004 | 44.31 | 47.17 | 53.84 | 54.92 | 59.34 | 63.73 | 70.32 | 69.65 | 62.84 | a | 56.45 | 47.15 | 44.97 | 56.22 | ||||||||||||
| 2005 | 43.44 | 46.46 | 51.23 | 53.08 | 60.60 | 62.83 | 70.53 | 69.92 | 62.77 | 57.55 | 46.73 | 43.61 | 55.73 | |||||||||||||
| 2006 | 45.97 | 46.23 | 46.34 | 53.27 | 59.42 | 65.45 | 69.90 | 67.61 | 65.03 | 55.58 | 48.72 | 42.84 | 55.53 | |||||||||||||
| 2007 | 40.18 | 45.48 | 52.79 | 52.93 | 58.08 | 61.57 | 69.34 | 67.34 | 62.42 | 54.92 | 46.68 | 42.52 | 54.52 | |||||||||||||
| 2008 | 39.61 | 46.14 | 47.06 | 50.08 | 59.61 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 48.50 | ||||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 42.36 | 45.81 | 48.75 | 52.33 | 57.62 | 62.47 | 67.67 | 67.58 | 63.75 | 55.95 | 47.60 | 43.04 | 54.63 | |||||||||||||
| S.D. | 3.10 | 2.56 | 2.46 | 2.35 | 2.23 | 2.13 | 2.12 | 1.88 | 2.06 | 2.17 | 2.50 | 2.44 | 1.04 | |||||||||||||
| SKEW | -1.17 | -0.48 | 0.53 | -0.26 | 0.34 | -0.06 | -0.45 | 0.41 | -0.35 | 0.28 | -0.76 | -0.23 | 0.43 | |||||||||||||
| MAX | 48.65 | 51.54 | 54.95 | 57.98 | 64.94 | 66.77 | 71.73 | 71.95 | 67.15 | 60.69 | 51.57 | 50.00 | 57.79 | |||||||||||||
| MIN | 32.03 | 38.04 | 44.53 | 45.84 | 53.27 | 57.72 | 62.11 | 63.77 | 58.33 | 51.32 | 41.23 | 35.21 | 52.74 | |||||||||||||
| NO YRS | 69 | 68 | 69 | 70 | 68 | 65 | 67 | 65 | 63 | 62 | 65 | 68 | 47 | |||||||||||||