| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1937 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 59.78 | 61.82 | 62.81 | 59.68 | 57.40 | 48.78 | 44.85 | 56.45 | ||||||||
| 1938 | 43.35 | a | 44.57 | 47.54 | d | 56.77 | ----- | z | ----- | z | 60.79 | 60.92 | 62.80 | 57.02 | 47.31 | a | 46.45 | 52.75 | ||||||||
| 1939 | 45.21 | 43.87 | a | 48.65 | 52.80 | 57.08 | 57.60 | 61.33 | a | ----- | z | ----- | z | 56.81 | 51.27 | 48.66 | 52.33 | |||||||||
| 1940 | 44.95 | b | 47.80 | b | 48.98 | c | 51.67 | 54.41 | c | 57.03 | 59.66 | 61.08 | 59.55 | 55.66 | 46.12 | a | 44.08 | 52.58 | ||||||||
| 1941 | 45.40 | 46.43 | 48.21 | 48.05 | a | 53.76 | 56.18 | 61.77 | 58.15 | 60.00 | i | 56.87 | 51.18 | 45.73 | a | 51.98 | ||||||||||
| 1942 | 44.10 | 46.21 | 47.60 | b | 51.67 | 54.27 | 58.24 | a | 63.71 | 63.23 | 60.05 | 57.76 | 49.18 | 47.19 | d | 53.60 | ||||||||||
| 1943 | 41.53 | 49.48 | 47.89 | 51.38 | 52.19 | 56.32 | 58.82 | 60.19 | b | ----- | z | 54.81 | b | 49.90 | a | 43.17 | b | 51.43 | ||||||||
| 1944 | 44.15 | a | 44.07 | 46.40 | 48.65 | 53.24 | 56.33 | 59.48 | b | 61.28 | b | 60.10 | 57.42 | 47.60 | 43.68 | 51.87 | ||||||||||
| 1945 | 45.48 | a | 46.18 | 45.21 | 47.80 | 53.82 | 56.63 | 58.47 | b | 58.52 | 57.62 | 53.03 | 48.18 | 45.10 | 51.34 | |||||||||||
| 1946 | 43.40 | 44.29 | 45.73 | 48.37 | 54.37 | 56.42 | 59.82 | 58.97 | 57.85 | 50.94 | 45.68 | 43.98 | 50.82 | |||||||||||||
| 1947 | 40.98 | 47.30 | 49.10 | 52.13 | 54.24 | 56.83 | 60.68 | 59.37 | 58.58 | 55.35 | 48.87 | 45.32 | 52.40 | |||||||||||||
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 60.16 | 62.07 | c | 59.48 | a | 53.15 | a | 46.52 | ----- | z | 56.28 | |||
| 1949 | ----- | z | ----- | z | ----- | z | ----- | z | 54.89 | m | 57.22 | 57.94 | 60.47 | 59.50 | 50.58 | 52.80 | 43.69 | 54.60 | ||||||||
| 1950 | 40.27 | 48.39 | 47.81 | 49.08 | 49.94 | 57.05 | ----- | z | ----- | z | ----- | z | ----- | z | 52.33 | a | 52.61 | 49.69 | ||||||||
| 1951 | 46.19 | 47.07 | 45.27 | 50.85 | 55.40 | 59.23 | 62.00 | 61.38 | a | 58.98 | 56.48 | a | 50.27 | 42.66 | 52.98 | |||||||||||
| 1952 | 42.00 | 45.31 | 45.07 | a | 50.07 | 53.76 | 55.00 | 59.61 | 60.69 | 59.78 | 57.08 | 45.30 | 45.40 | 51.59 | ||||||||||||
| 1953 | 49.37 | 45.61 | 46.35 | 48.87 | 52.79 | 54.80 | 59.87 | 61.73 | 61.92 | 56.48 | 51.63 | 46.44 | 52.99 | |||||||||||||
| 1954 | 44.45 | 48.14 | 45.24 | 48.60 | 53.66 | 55.35 | 58.02 | 59.79 | 59.55 | a | 54.66 | 52.25 | 44.60 | 52.03 | ||||||||||||
| 1955 | 42.97 | 42.68 | 44.35 | 45.65 | 50.23 | a | 55.45 | 57.85 | 58.44 | 59.05 | 55.31 | 48.38 | 45.52 | 50.49 | ||||||||||||
| 1956 | 44.16 | 40.95 | 45.58 | 49.63 | 54.87 | 55.68 | 60.73 | 60.81 | 59.37 | 53.56 | 46.70 | 44.53 | 51.38 | |||||||||||||
| 1957 | 38.58 | 47.07 | 48.26 | 50.59 | a | 55.27 | 59.00 | 59.92 | 60.77 | 62.15 | 54.97 | 47.62 | 46.85 | 52.59 | ||||||||||||
| 1958 | 47.39 | 50.82 | 45.23 | 50.62 | 55.68 | 60.65 | 62.18 | 61.61 | 60.37 | 56.03 | 49.25 | 48.97 | 54.07 | |||||||||||||
| 1959 | 46.81 | 45.00 | 47.23 | 50.30 | 53.26 | 58.08 | 59.32 | 59.45 | 56.85 | 55.66 | 49.33 | 45.05 | 52.20 | |||||||||||||
| 1960 | 42.92 | 45.03 | 48.42 | 50.98 | 52.47 | 56.88 | 57.68 | 58.08 | 58.23 | 55.15 | 48.58 | 45.15 | 51.63 | |||||||||||||
| 1961 | 47.56 | 47.61 | 47.66 | 48.95 | 52.06 | 59.23 | 60.97 | 61.77 | 57.13 | 53.85 | 45.33 | 44.26 | 52.20 | |||||||||||||
| 1962 | 40.90 | 45.79 | 46.05 | 51.08 | 51.15 | 55.85 | 58.48 | 61.69 | 60.38 | 55.26 | 50.23 | 45.82 | 51.89 | |||||||||||||
| 1963 | 39.65 | 52.11 | 46.60 | 48.02 | 53.16 | 57.07 | 59.63 | 60.77 | 62.13 | 56.42 | 49.65 | 45.32 | 52.54 | |||||||||||||
| 1964 | 44.08 | 44.84 | 45.58 | 47.43 | 51.03 | 56.87 | 60.11 | 60.65 | 58.22 | 56.52 | 46.30 | 44.34 | 51.33 | |||||||||||||
| 1965 | 44.23 | 45.18 | 47.15 | 50.60 | 50.79 | 54.67 | 59.10 | 63.31 | 58.80 | 57.82 | 50.70 | 41.98 | 52.03 | |||||||||||||
| 1966 | 44.60 | 43.43 | 45.50 | 50.57 | 52.35 | 58.77 | 59.89 | 60.98 | 62.03 | 54.98 | 49.50 | 46.19 | 52.40 | |||||||||||||
| 1967 | 45.24 | 46.29 | 45.19 | 46.40 | 53.87 | 59.05 | 61.23 | 63.34 | 63.58 | 56.35 | 50.62 | 43.29 | 52.87 | |||||||||||||
| 1968 | 43.74 | 51.53 | 49.63 | 48.02 | 53.56 | 58.85 | 61.29 | 62.32 | 60.68 | 54.76 | 49.37 | 43.68 | 53.12 | |||||||||||||
| 1969 | 39.73 | 42.16 | 47.60 | 49.23 | 56.21 | 59.65 | 59.85 | 60.72 | a | 60.18 | 54.76 | 49.45 | 46.05 | 52.13 | ||||||||||||
| 1970 | 46.50 | 48.64 | 49.15 | 47.40 | 54.06 | 57.95 | 60.11 | 59.76 | 57.32 | 53.52 | 48.62 | 43.61 | 52.22 | |||||||||||||
| 1971 | 42.02 | 44.96 | 44.95 | 48.47 | 52.35 | 55.98 | 59.27 | 62.90 | 58.77 | 51.81 | 47.20 | 41.77 | 50.87 | |||||||||||||
| 1972 | 41.06 | 45.78 | 49.21 | 47.28 | 53.87 | 58.03 | 61.85 | 61.52 | 57.53 | 53.00 | 49.20 | 40.81 | 51.60 | |||||||||||||
| 1973 | 41.48 | 48.14 | 45.55 | 50.31 | a | 55.00 | 57.97 | 59.94 | 58.87 | 57.07 | 53.92 | a | 47.15 | 47.63 | 51.92 | |||||||||||
| 1974 | 41.44 | 43.75 | 46.95 | 49.53 | 52.79 | 57.00 | a | 60.23 | 61.00 | a | 60.67 | 53.81 | 49.68 | 45.90 | a | 51.90 | ||||||||||
| 1975 | 45.60 | 44.75 | 45.34 | 45.18 | 53.13 | 56.48 | 60.11 | 59.44 | 59.48 | a | 53.45 | 46.48 | 45.24 | 51.22 | ||||||||||||
| 1976 | 44.55 | 44.21 | a | 44.78 | a | 47.28 | 53.10 | 55.43 | 60.32 | 60.37 | a | 59.81 | c | 54.98 | 51.73 | 42.73 | 51.61 | |||||||||
| 1977 | 43.55 | 50.05 | 46.06 | 50.57 | 51.30 | a | 58.18 | 59.48 | 62.34 | 58.68 | 55.61 | 47.73 | 47.15 | 52.56 | ||||||||||||
| 1978 | 46.85 | 48.29 | 51.24 | 50.38 | b | 53.60 | 60.42 | 60.84 | 62.02 | 60.10 | 56.79 | 44.95 | 40.53 | 53.00 | ||||||||||||
| 1979 | 38.19 | 44.95 | 50.50 | 51.17 | 54.77 | 58.00 | 62.34 | 62.50 | 63.67 | d | 57.31 | 48.05 | 47.35 | 53.23 | ||||||||||||
| 1980 | 41.82 | 48.59 | 47.60 | g | 50.68 | b | 53.55 | 56.45 | 61.10 | a | 58.89 | 59.86 | a | 55.92 | 50.15 | 46.71 | b | 53.06 | ||||||||
| 1981 | 48.94 | o | 47.82 | 48.89 | 50.47 | 54.23 | 58.53 | 59.62 | a | 60.81 | 59.19 | a | 53.47 | 48.63 | 45.34 | 53.36 | ||||||||||
| 1982 | 39.48 | 42.96 | 45.16 | 46.08 | 52.82 | 56.97 | 59.94 | 61.06 | 60.05 | 56.03 | 46.60 | 43.95 | 50.93 | |||||||||||||
| 1983 | 46.21 | n | 49.34 | i | 51.31 | r | 51.12 | j | 53.87 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 53.87 | ||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 43.47 | 46.24 | 46.97 | 49.53 | 53.43 | 57.34 | 60.16 | 60.84 | 59.69 | 55.17 | 48.75 | 45.10 | 52.11 | |||||||||||||
| S.D. | 2.60 | 2.50 | 1.74 | 2.13 | 1.53 | 1.51 | 1.29 | 1.42 | 1.68 | 1.75 | 2.01 | 2.18 | 0.81 | |||||||||||||
| SKEW | -0.07 | 0.34 | 0.51 | 0.51 | -0.18 | 0.26 | 0.28 | -0.12 | 0.50 | -0.68 | 0.03 | 0.65 | 0.24 | |||||||||||||
| MAX | 49.37 | 52.11 | 51.24 | 56.77 | 57.08 | 60.65 | 63.71 | 63.34 | 63.67 | 57.82 | 52.80 | 52.61 | 54.07 | |||||||||||||
| MIN | 38.19 | 40.95 | 44.35 | 45.18 | 49.94 | 54.67 | 57.68 | 58.08 | 56.85 | 50.58 | 44.95 | 40.53 | 50.49 | |||||||||||||
| NO YRS | 42 | 43 | 42 | 43 | 43 | 44 | 45 | 44 | 42 | 45 | 46 | 45 | 36 | |||||||||||||