| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1956 | 43.31 | e | 39.10 | 44.68 | 56.97 | 62.81 | 61.77 | 75.13 | a | 70.61 | 68.07 | 54.23 | a | 52.50 | x | ----- | z | 57.67 | ||||||||
| 1957 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 69.75 | s | 68.06 | 73.40 | 56.26 | 51.20 | 47.35 | 59.26 | ||||||
| 1958 | 49.32 | 51.63 | a | 47.16 | 52.10 | 66.00 | 66.63 | 77.32 | 76.94 | 66.90 | 64.87 | 49.87 | 51.16 | 59.99 | ||||||||||||
| 1959 | 44.94 | 43.00 | 47.68 | 53.67 | 57.03 | 63.97 | 73.23 | 70.29 | 61.37 | 58.97 | 54.03 | 46.42 | 56.22 | |||||||||||||
| 1960 | 41.32 | 43.97 | 49.29 | 52.63 | 54.58 | 66.93 | 75.68 | 67.58 | 68.50 | 60.06 | 47.97 | 48.84 | 56.45 | |||||||||||||
| 1961 | 50.87 | 46.07 | 46.45 | 51.00 | 56.84 | 70.63 | 74.32 | 76.61 | 62.27 | 57.90 | 47.97 | 42.61 | 56.96 | |||||||||||||
| 1962 | 45.26 | 46.18 | 44.90 | 54.69 | a | 51.42 | 64.67 | 71.23 | a | 68.42 | 67.76 | a | 59.58 | 50.23 | 51.26 | 56.30 | ||||||||||
| 1963 | 41.74 | 54.11 | 46.90 | 47.66 | a | 60.66 | b | 59.76 | a | 64.35 | 69.74 | 71.27 | 57.97 | 48.77 | 49.81 | 56.06 | ||||||||||
| 1964 | 41.81 | 46.97 | 44.65 | 49.40 | 55.87 | 62.63 | 68.58 | 66.94 | 63.20 | 62.19 | 46.59 | a | 39.87 | 54.06 | ||||||||||||
| 1965 | 44.97 | 45.96 | 53.16 | 54.77 | 55.55 | 64.63 | 74.68 | 71.26 | 65.50 | 64.39 | 51.23 | 42.26 | 57.36 | |||||||||||||
| 1966 | 43.00 | 43.54 | 48.19 | 54.77 | 60.45 | 64.73 | 67.87 | 71.65 | 68.23 | 59.16 | 50.73 | 44.19 | 56.38 | |||||||||||||
| 1967 | 43.55 | 47.25 | 44.06 | 46.80 | 60.35 | 68.73 | 74.42 | 80.71 | 72.87 | 58.58 | 51.97 | 40.20 | a | 57.46 | ||||||||||||
| 1968 | 43.48 | 53.07 | 51.61 | 50.10 | 58.29 | 63.87 | 72.58 | 68.43 | c | 65.90 | 56.26 | 50.21 | b | 40.29 | 56.17 | |||||||||||
| 1969 | 35.82 | c | 42.00 | 50.74 | 52.87 | 63.61 | 65.60 | 67.87 | 68.94 | 65.50 | 55.48 | 52.10 | 45.81 | 55.53 | ||||||||||||
| 1970 | 44.23 | 52.07 | 48.81 | 46.67 | 59.97 | 68.30 | 74.03 | 73.03 | 63.00 | 57.55 | 47.60 | 39.97 | 56.27 | |||||||||||||
| 1971 | 41.74 | 43.86 | 42.97 | 50.97 | 58.39 | 59.63 | 71.77 | 73.42 | 62.97 | 54.43 | a | 47.10 | 38.87 | 53.84 | ||||||||||||
| 1972 | 38.90 | 45.59 | 50.77 | 47.13 | 60.73 | a | 64.10 | 75.74 | 75.77 | 63.93 | 58.03 | 48.53 | 39.39 | 55.72 | ||||||||||||
| 1973 | 41.39 | 49.75 | 45.13 | 53.40 | 61.71 | 64.40 | 73.58 | 68.58 | 66.27 | 56.23 | 42.10 | 45.97 | 55.71 | |||||||||||||
| 1974 | 38.35 | 43.21 | 47.42 | 50.93 | 54.23 | 66.00 | 68.84 | 71.90 | 76.17 | 62.53 | a | 50.20 | 44.03 | 56.15 | ||||||||||||
| 1975 | 43.55 | 43.79 | 43.00 | 47.13 | 59.29 | 62.07 | 70.87 | 65.97 | 72.97 | 52.97 | 45.57 | 46.19 | 54.45 | |||||||||||||
| 1976 | 47.03 | 44.28 | 45.10 | 51.37 | 59.59 | b | 60.97 | 70.45 | 66.61 | 68.00 | 61.03 | 56.10 | 49.55 | 56.67 | ||||||||||||
| 1977 | 48.03 | 52.18 | 45.10 | 57.57 | 52.77 | 67.17 | 68.94 | 75.90 | 61.13 | 57.74 | 45.87 | 44.32 | 56.39 | |||||||||||||
| 1978 | 46.26 | 47.89 | 53.39 | 51.00 | 56.55 | 66.60 | 70.19 | 68.81 | 61.90 | 61.68 | c | 45.76 | a | 38.32 | 55.70 | |||||||||||
| 1979 | 38.65 | 41.32 | 51.77 | 51.07 | 61.13 | 66.03 | a | 73.83 | a | 69.42 | 69.97 | 60.61 | 49.97 | 49.16 | 56.91 | |||||||||||
| 1980 | 41.52 | 50.48 | 44.77 | 56.10 | 55.80 | a | 59.47 | 70.58 | 68.19 | 67.43 | 62.50 | a | 51.20 | 49.74 | 56.48 | |||||||||||
| 1981 | 51.13 | 48.89 | 50.26 | 53.00 | 56.23 | 62.03 | 70.42 | 77.48 | 68.76 | a | 57.71 | 50.80 | 44.13 | 57.57 | ||||||||||||
| 1982 | 39.16 | 43.36 | 47.19 | 49.73 | 59.94 | 66.40 | 69.23 | 72.10 | 65.33 | 58.16 | 46.79 | a | 43.32 | 55.06 | ||||||||||||
| 1983 | 48.58 | 48.71 | 49.23 | 53.83 | 62.87 | 62.03 | 66.19 | 70.35 | 64.23 | 59.00 | 46.33 | 37.53 | a | 55.74 | ||||||||||||
| 1984 | 47.77 | 48.31 | 50.81 | 49.07 | 57.03 | 62.37 | 72.68 | 72.29 | 65.97 | 52.68 | 45.33 | 39.13 | 55.29 | |||||||||||||
| 1985 | 47.45 | 42.61 | 45.97 | 55.47 | 58.74 | 67.87 | 78.29 | 72.03 | 62.03 | 55.61 | 38.43 | 47.37 | a | 55.99 | ||||||||||||
| 1986 | 50.53 | a | 45.64 | 54.94 | 51.70 | 59.84 | 69.97 | 66.74 | 77.71 | 61.03 | 63.26 | 48.87 | 46.19 | 58.04 | ||||||||||||
| 1987 | 44.52 | 48.07 | 50.65 | 59.33 | 62.58 | 70.60 | 68.06 | 74.97 | 70.93 | 66.55 | 50.53 | 39.90 | 58.89 | |||||||||||||
| 1988 | 42.00 | 51.41 | 49.23 | 54.47 | 57.87 | 64.67 | 73.45 | 74.81 | 71.33 | 64.03 | 45.47 | 44.55 | 57.77 | |||||||||||||
| 1989 | 42.29 | 38.75 | 46.90 | 58.90 | 59.81 | 68.53 | 67.06 | 67.94 | 71.80 | 56.87 | 49.27 | 48.16 | 56.36 | |||||||||||||
| 1990 | 42.58 | 42.54 | 51.94 | 57.63 | 57.35 | 64.53 | 75.58 | 73.13 | 70.70 | 54.61 | 46.77 | 35.35 | 56.06 | |||||||||||||
| 1991 | 43.58 | 53.75 | 45.87 | 50.07 | 53.48 | 60.23 | 75.42 | 73.55 | 74.43 | 62.71 | 48.37 | 45.45 | 57.24 | |||||||||||||
| 1992 | 48.39 | 53.72 | 56.77 | 56.80 | 69.29 | 71.23 | 73.97 | 76.61 | 68.27 | 59.32 | 47.37 | 38.90 | 60.05 | |||||||||||||
| 1993 | 38.55 | 43.61 | 51.65 | 50.97 | 63.19 | 62.87 | 64.19 | 70.90 | 72.80 | 62.10 | 44.07 | 43.03 | 55.66 | |||||||||||||
| 1994 | 46.90 | 43.64 | 53.45 | 54.83 | 61.71 | 63.23 | 76.13 | 72.81 | 71.10 | 56.42 | 40.33 | 41.61 | 56.85 | |||||||||||||
| 1995 | 45.29 | 50.25 | 49.45 | 53.23 | 62.06 | 65.03 | 73.26 | 69.90 | 68.30 | 55.55 | 51.47 | 43.29 | 57.26 | |||||||||||||
| 1996 | 41.74 | 46.66 | 50.81 | 54.47 | 56.39 | 66.03 | 77.58 | 76.29 | 65.80 | 56.48 | 47.80 | 42.48 | 56.88 | |||||||||||||
| 1997 | 43.13 | 45.36 | 47.55 | 52.63 | 66.74 | 64.23 | 71.58 | 75.77 | 69.07 | 53.90 | 50.33 | 42.68 | 56.91 | |||||||||||||
| 1998 | 44.84 | 45.79 | 48.90 | 54.50 | 55.65 | 65.83 | 75.19 | 76.58 | 71.80 | 55.84 | 46.00 | 40.29 | 56.77 | |||||||||||||
| 1999 | 42.87 | 42.50 | 45.26 | 53.60 | 56.48 | b | 62.97 | 72.58 | 73.06 | 72.90 | 60.81 | 51.53 | 44.26 | 56.57 | ||||||||||||
| 2000 | 39.81 | 45.52 | 48.39 | 58.30 | 57.90 | 70.07 | 72.10 | 73.13 | 67.70 | 56.32 | 43.67 | 44.71 | 56.47 | |||||||||||||
| 2001 | 45.84 | 45.25 | 49.77 | 51.30 | 65.81 | 63.97 | 71.35 | 74.10 | 71.33 | 57.35 | ----- | z | ----- | z | 59.61 | |||||||||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 43.91 | 46.48 | 48.50 | 52.77 | 59.21 | 64.98 | 71.94 | 72.16 | 67.83 | 58.62 | 48.24 | 43.82 | 56.53 | |||||||||||||
| S.D. | 3.57 | 3.93 | 3.25 | 3.28 | 3.81 | 3.05 | 3.48 | 3.52 | 3.98 | 3.35 | 3.42 | 3.95 | 1.25 | |||||||||||||
| SKEW | 0.10 | 0.30 | 0.35 | 0.02 | 0.39 | 0.21 | -0.35 | 0.24 | -0.01 | 0.37 | -0.55 | 0.06 | 0.65 | |||||||||||||
| MAX | 51.13 | 54.11 | 56.77 | 59.33 | 69.29 | 71.23 | 78.29 | 80.71 | 76.17 | 66.55 | 56.10 | 51.26 | 60.05 | |||||||||||||
| MIN | 35.82 | 38.75 | 42.97 | 46.67 | 51.42 | 59.47 | 64.19 | 65.97 | 61.03 | 52.68 | 38.43 | 35.35 | 53.84 | |||||||||||||
| NO YRS | 45 | 45 | 45 | 45 | 45 | 45 | 45 | 46 | 46 | 46 | 44 | 44 | 43 | |||||||||||||