| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 62.90 | 63.23 | 64.20 | 61.71 | 58.16 | b | 52.63 | 60.47 | ||||||
| 1949 | 47.67 | a | 50.34 | 53.72 | a | 57.63 | 60.62 | a | 64.78 | a | 64.98 | c | 65.85 | 65.80 | 61.27 | 60.50 | 53.00 | 58.85 | ||||||||
| 1950 | 49.48 | 51.45 | 54.15 | 57.40 | 58.13 | a | 60.43 | a | 66.31 | 64.21 | 63.38 | 61.60 | 59.12 | 56.71 | 58.53 | |||||||||||
| 1951 | 53.24 | 51.80 | 54.05 | 56.84 | a | 57.52 | a | 61.37 | 64.98 | 64.79 | 64.55 | 64.00 | 58.98 | d | 53.24 | 58.78 | ||||||||||
| 1952 | 51.15 | 54.88 | 52.68 | 56.10 | 59.39 | 60.07 | 62.24 | 64.71 | b | 65.88 | a | 61.08 | 56.75 | 53.44 | 58.20 | |||||||||||
| 1953 | 56.80 | a | 56.43 | 54.03 | 55.27 | 59.78 | a | 60.33 | 66.52 | a | 64.52 | c | 63.27 | 62.92 | 59.27 | 55.73 | a | 59.57 | ||||||||
| 1954 | 52.63 | 57.25 | 54.35 | 55.29 | a | 58.44 | 61.75 | 68.24 | 67.18 | 63.85 | 60.47 | a | 59.19 | a | 54.50 | a | 59.43 | |||||||||
| 1955 | 50.84 | 51.93 | 55.53 | a | 57.48 | f | 57.05 | a | 60.14 | e | 62.79 | 66.24 | 66.03 | 58.44 | 56.14 | a | 52.73 | a | 57.99 | |||||||
| 1956 | 52.16 | 49.43 | 53.18 | 53.52 | 59.08 | 60.45 | 64.03 | 64.37 | 64.18 | 60.21 | 59.03 | 54.92 | 57.88 | |||||||||||||
| 1957 | 48.16 | 52.38 | 53.16 | 53.78 | 56.66 | 61.52 | 63.16 | 66.95 | 64.13 | 61.44 | 57.12 | 56.95 | 57.95 | |||||||||||||
| 1958 | 55.74 | 55.98 | 54.08 | 58.82 | 59.97 | 63.62 | 64.52 | 67.44 | 66.85 | 66.26 | 57.32 | 57.66 | 60.69 | |||||||||||||
| 1959 | 55.95 | 54.39 | 58.94 | 59.95 | 61.73 | 65.05 | 70.13 | 69.94 | 68.68 | 64.87 | 62.07 | 57.73 | 62.45 | |||||||||||||
| 1960 | 52.27 | 54.09 | 56.35 | 59.22 | 61.60 | 63.12 | 66.65 | 67.37 | 67.63 | 63.66 | 57.32 | 54.34 | 60.30 | |||||||||||||
| 1961 | 57.37 | 57.61 | 56.95 | 58.08 | 59.65 | a | 62.25 | 67.63 | 68.11 | 65.22 | 63.11 | 57.48 | 52.32 | 60.48 | ||||||||||||
| 1962 | 54.79 | 53.02 | c | 52.89 | ----- | z | 58.31 | d | 60.88 | 62.64 | c | 65.29 | 63.30 | 60.44 | 58.22 | 54.77 | 58.60 | |||||||||
| 1963 | 53.60 | 57.11 | 55.73 | 55.63 | 60.90 | 62.15 | 64.16 | 67.55 | 71.75 | b | 66.58 | 58.53 | 56.15 | 60.82 | ||||||||||||
| 1964 | 54.98 | 55.11 | a | 55.11 | 56.67 | 57.11 | 59.98 | 65.89 | 70.27 | 68.48 | 66.88 | b | 58.07 | 56.81 | 60.45 | |||||||||||
| 1965 | 55.11 | 54.61 | 57.29 | 58.18 | 60.16 | 60.95 | 64.02 | a | ----- | z | 66.37 | 67.45 | ----- | z | 54.92 | 59.91 | ||||||||||
| 1966 | 54.03 | a | 54.62 | 57.03 | 62.50 | ----- | z | 64.35 | 65.84 | 69.00 | 67.55 | 66.63 | 60.53 | 57.53 | 61.78 | |||||||||||
| 1967 | 55.94 | 56.96 | b | 57.40 | 55.27 | 62.23 | 64.17 | 70.18 | 73.39 | 71.92 | 67.32 | 65.07 | a | 56.43 | b | 63.02 | ||||||||||
| 1968 | ----- | z | 57.66 | ----- | z | 61.92 | d | 63.71 | b | 65.10 | 68.06 | 68.40 | 67.57 | 62.97 | 61.28 | 54.10 | 63.08 | |||||||||
| 1969 | 56.47 | 52.02 | 54.89 | 60.47 | 61.03 | 64.57 | ----- | z | 68.87 | 64.75 | 62.02 | ----- | z | 55.15 | 60.02 | |||||||||||
| 1970 | 56.69 | 58.55 | 52.55 | 56.92 | 58.60 | 60.17 | 64.05 | 63.94 | 61.83 | 59.56 | 54.92 | 51.08 | 58.24 | |||||||||||||
| 1971 | 50.21 | 52.30 | 53.19 | 54.75 | 56.81 | 59.10 | 65.34 | 70.42 | 67.55 | 61.08 | 56.20 | 51.32 | 58.19 | |||||||||||||
| 1972 | 50.82 | 53.31 | 57.02 | 57.75 | 60.55 | 64.65 | 68.05 | 68.37 | 65.68 | 63.97 | 57.13 | 53.84 | 60.09 | |||||||||||||
| 1973 | 52.74 | 55.57 | 53.79 | 56.37 | 58.24 | 61.48 | ----- | z | 66.35 | 64.82 | 61.35 | 56.15 | 55.50 | 58.40 | ||||||||||||
| 1974 | 52.23 | 54.59 | 54.32 | 57.30 | 59.18 | 63.20 | 66.03 | 65.63 | 65.66 | a | 62.40 | 58.73 | 53.74 | 59.42 | ||||||||||||
| 1975 | 52.73 | 52.59 | 53.33 | j | 55.00 | v | 58.40 | 60.87 | 64.32 | 65.02 | 66.28 | 62.08 | 58.52 | 53.24 | 59.40 | |||||||||||
| 1976 | 55.90 | 55.66 | 56.61 | 57.78 | 62.52 | 68.10 | 69.42 | 68.69 | 69.12 | 67.48 | 63.40 | 59.15 | 62.82 | |||||||||||||
| 1977 | 57.15 | 59.00 | 56.75 | a | 61.88 | 63.29 | 65.60 | 68.71 | b | 71.48 | 69.37 | 65.95 | 62.17 | 60.35 | 63.47 | |||||||||||
| 1978 | 58.68 | 58.07 | 61.90 | 61.78 | 67.24 | 70.17 | 69.74 | 70.95 | 71.15 | 66.71 | 58.42 | 53.69 | 64.04 | |||||||||||||
| 1979 | 55.31 | 54.64 | 58.68 | 62.35 | 64.87 | a | 69.65 | 68.82 | 70.95 | 71.91 | a | 66.47 | b | 61.13 | 58.97 | 63.65 | ||||||||||
| 1980 | 59.79 | 61.40 | 60.50 | 63.93 | 63.90 | 67.05 | 71.32 | a | 71.12 | c | ----- | z | ----- | z | ----- | z | 58.27 | 64.14 | ||||||||
| 1981 | 59.42 | 60.34 | 59.16 | 60.55 | 64.45 | 68.87 | 70.13 | 70.39 | 68.75 | 65.82 | 62.93 | 58.85 | 64.14 | |||||||||||||
| 1982 | 56.27 | 58.89 | 58.27 | 60.15 | 61.65 | 61.77 | 65.74 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 60.39 | ||||||||
| 1983 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1984 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1985 | ----- | z | ----- | z | 53.23 | 57.73 | 58.90 | 62.42 | 68.63 | 67.34 | 66.53 | 66.47 | 57.10 | a | 56.23 | 61.46 | ||||||||||
| 1986 | 58.56 | 56.96 | 57.77 | 60.20 | 61.40 | 63.32 | 65.23 | 66.56 | 63.55 | 63.42 | 63.15 | 57.68 | 61.48 | |||||||||||||
| 1987 | 54.90 | 56.64 | 57.39 | 59.25 | 61.06 | 62.43 | 63.21 | 65.81 | 66.50 | 65.10 | ----- | z | 49.67 | m | 61.23 | |||||||||||
| 1988 | 53.77 | 56.12 | 57.90 | 57.58 | 58.47 | 59.98 | 65.40 | 65.50 | 64.22 | 62.48 | 57.40 | 54.02 | 59.40 | |||||||||||||
| 1989 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1990 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1991 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1992 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1993 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1994 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1995 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1996 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1997 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1998 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1999 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2000 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2001 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2002 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2003 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2004 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2005 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2006 | ----- | z | ----- | z | ----- | z | 55.80 | b | 59.87 | a | 63.83 | c | 66.66 | l | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 59.83 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 54.27 | 55.23 | 55.85 | 58.18 | 60.33 | 63.07 | 66.22 | 67.46 | 66.44 | 63.56 | 59.04 | 55.34 | 60.47 | |||||||||||||
| S.D. | 3.04 | 2.80 | 2.38 | 2.62 | 2.46 | 2.83 | 2.51 | 2.52 | 2.61 | 2.57 | 2.42 | 2.32 | 2.04 | |||||||||||||
| SKEW | -0.26 | 0.02 | 0.50 | 0.29 | 0.71 | 0.91 | 0.30 | 0.36 | 0.59 | 0.03 | 0.69 | 0.21 | 0.48 | |||||||||||||
| MAX | 59.79 | 61.40 | 61.90 | 63.93 | 67.24 | 70.17 | 71.32 | 73.39 | 71.92 | 67.48 | 65.07 | 60.35 | 64.14 | |||||||||||||
| MIN | 47.67 | 49.43 | 52.55 | 53.52 | 56.66 | 59.10 | 62.24 | 63.23 | 61.83 | 58.44 | 54.92 | 51.08 | 57.88 | |||||||||||||
| NO YRS | 36 | 37 | 36 | 36 | 38 | 39 | 37 | 37 | 37 | 37 | 34 | 37 | 26 | |||||||||||||