| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1949 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1950 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 73.23 | 73.18 | a | ----- | z | ----- | z | ----- | z | ----- | z | 73.20 | ||
| 1951 | ----- | z | ----- | z | ----- | z | ----- | z | 56.42 | 65.85 | 71.77 | 70.50 | 66.37 | 52.34 | 38.92 | 31.05 | 56.65 | |||||||||
| 1952 | 26.82 | 37.40 | 41.44 | 51.32 | 58.45 | 61.60 | 72.02 | 70.37 | 65.98 | 58.73 | 32.75 | 33.66 | 50.88 | |||||||||||||
| 1953 | 43.47 | 40.84 | 44.53 | 47.90 | 53.37 | 58.02 | 70.63 | 68.76 | b | 64.67 | 53.40 | 43.50 | 40.18 | 52.44 | ||||||||||||
| 1954 | 32.10 | 37.14 | 39.42 | a | 47.70 | 56.40 | 58.70 | 67.44 | 64.65 | 60.30 | 48.24 | 44.65 | 32.39 | 49.09 | ||||||||||||
| 1955 | 32.15 | 35.77 | 37.48 | 42.82 | 53.47 | 64.60 | 67.38 | a | 71.89 | 62.35 | 52.23 | 34.13 | 33.12 | a | 48.95 | |||||||||||
| 1956 | 33.58 | 28.60 | 43.45 | 52.82 | 60.43 | a | 61.80 | 73.69 | 70.69 | 64.31 | a | 50.43 | a | 37.53 | 36.45 | 51.15 | ||||||||||
| 1957 | 19.02 | 36.30 | 41.94 | 51.68 | 62.11 | 68.33 | 69.55 | 68.13 | a | 66.33 | 49.31 | 41.95 | 40.16 | 51.23 | ||||||||||||
| 1958 | 36.37 | 43.25 | 41.69 | 47.62 | 62.32 | 68.17 | 75.39 | 75.60 | 63.70 | 54.90 | 43.55 | 36.40 | 54.08 | |||||||||||||
| 1959 | 34.48 | 37.09 | 40.81 | 50.45 | 53.44 | 65.18 | 74.61 | 68.21 | 59.87 | 52.84 | 37.88 | 34.52 | 50.78 | |||||||||||||
| 1960 | 26.15 | 36.28 | 42.26 | 50.20 | 54.16 | 65.98 | 75.87 | 68.34 | 63.57 | 53.65 | 41.62 | 30.03 | 50.67 | |||||||||||||
| 1961 | 35.26 | 44.25 | 45.42 | 48.97 | 55.66 | 69.17 | 74.89 | 76.10 | 58.90 | 50.40 | 35.17 | 36.23 | a | 52.53 | ||||||||||||
| 1962 | 32.56 | 37.23 | 40.71 | 52.83 | 52.21 | 63.10 | 70.32 | 68.37 | 64.52 | ----- | z | ----- | z | ----- | z | 53.54 | ||||||||||
| 1963 | 20.44 | w | 41.30 | 44.21 | 46.33 | 57.50 | 63.55 | 66.84 | 71.40 | 68.40 | 55.94 | 43.48 | 31.07 | a | 53.64 | |||||||||||
| 1964 | 38.56 | 40.90 | 42.35 | 46.92 | 54.68 | 62.10 | 70.08 | ----- | z | ----- | z | ----- | z | 37.21 | f | 30.40 | k | 50.80 | ||||||||
| 1965 | 32.67 | h | 47.20 | c | 46.64 | i | 52.19 | c | 55.56 | d | 64.89 | b | 73.40 | a | 71.58 | 60.80 | c | 57.65 | 45.87 | c | 35.89 | c | 56.50 | |||
| 1966 | 36.89 | c | 39.59 | 44.48 | a | 51.02 | d | 58.94 | f | 62.45 | a | 69.76 | b | 71.25 | c | 66.81 | i | 53.42 | a | 43.63 | d | 39.52 | f | 52.50 | ||
| 1967 | 41.40 | b | 43.17 | a | 42.94 | e | 45.47 | 59.34 | b | 68.72 | a | 74.45 | a | 80.72 | h | 70.60 | a | 55.74 | 42.42 | d | 36.10 | f | 54.43 | |||
| 1968 | 36.96 | c | 42.40 | 47.89 | 50.42 | d | 57.48 | c | 66.37 | 81.09 | o | 70.12 | r | ----- | z | 51.27 | 41.21 | i | 31.83 | h | 50.40 | |||||
| 1969 | 22.96 | d | 35.34 | f | 42.92 | 50.62 | 60.77 | a | ----- | z | ----- | z | ----- | z | 61.98 | a | 49.83 | e | ----- | z | ----- | z | 48.18 | |||
| 1970 | ----- | z | 40.76 | c | 43.43 | c | 47.83 | j | 57.46 | c | 74.32 | m | 75.57 | d | 71.85 | r | 59.60 | e | 48.98 | c | 39.90 | d | 35.66 | i | 52.24 | |
| 1971 | ----- | z | 39.98 | g | 40.44 | 47.17 | 57.50 | 59.43 | 73.63 | 76.63 | 59.48 | 51.31 | 41.90 | 36.10 | 54.36 | |||||||||||
| 1972 | 34.94 | 38.59 | 47.40 | 44.26 | a | 60.44 | 65.73 | 73.84 | 74.34 | 61.02 | 53.73 | 43.50 | 27.79 | 52.13 | ||||||||||||
| 1973 | 30.53 | 36.50 | 44.13 | 50.77 | 59.58 | 64.43 | 72.95 | 69.32 | 63.67 | 52.19 | 39.27 | 37.47 | 51.73 | |||||||||||||
| 1974 | 29.03 | 41.39 | 44.05 | 48.53 | 54.27 | 68.33 | 69.81 | 72.47 | a | 66.97 | 52.76 | f | 42.27 | 39.18 | 52.39 | |||||||||||
| 1975 | 34.73 | 35.27 | 40.95 | 44.62 | 56.55 | 62.78 | 73.34 | 66.26 | 64.02 | 53.05 | 41.65 | 37.92 | 50.93 | |||||||||||||
| 1976 | 37.73 | 39.00 | 41.27 | 46.98 | 56.95 | 61.77 | 70.27 | 67.44 | 65.62 | 53.95 | 41.45 | 36.76 | 51.60 | |||||||||||||
| 1977 | 26.06 | 39.32 | 42.81 | 53.13 | 52.19 | 67.22 | 69.90 | 75.00 | 58.13 | ----- | z | 40.37 | 35.16 | 50.85 | ||||||||||||
| 1978 | 32.03 | 38.73 | 46.39 | 48.90 | 53.96 | c | 67.03 | 72.02 | 68.89 | 60.45 | 53.52 | 31.93 | 32.03 | 50.49 | ||||||||||||
| 1979 | 16.15 | 37.98 | 45.11 | 48.42 | 61.02 | 66.00 | 71.76 | 68.79 | 66.03 | 55.66 | 35.53 | 37.79 | 50.85 | |||||||||||||
| 1980 | 27.74 | 34.24 | 42.89 | 51.50 | 55.59 | b | 61.37 | 71.53 | 68.13 | 65.10 | 53.02 | d | 43.35 | 38.18 | 51.05 | |||||||||||
| 1981 | 37.05 | 38.73 | 44.39 | 50.38 | 55.26 | 63.27 | 71.02 | 75.05 | 62.98 | 51.00 | 44.68 | 35.47 | 52.44 | |||||||||||||
| 1982 | 33.45 | a | 38.12 | 43.00 | 46.27 | 55.55 | 67.55 | 69.19 | 71.29 | 60.75 | 49.69 | 36.68 | 33.13 | 50.39 | ||||||||||||
| 1983 | 41.08 | 40.79 | 45.90 | 49.18 | 59.81 | 61.48 | 67.21 | 70.84 | 60.65 | c | 52.11 | 43.48 | 23.59 | b | 51.34 | |||||||||||
| 1984 | 34.74 | 39.33 | 46.74 | 47.27 | 55.69 | 62.67 | 72.79 | 70.05 | 61.02 | 49.73 | 40.72 | 30.50 | b | 50.94 | ||||||||||||
| 1985 | 25.32 | 33.82 | 43.55 | 53.82 | 58.45 | 66.78 | 76.73 | 68.31 | 58.28 | 50.55 | 25.34 | a | 20.89 | 48.49 | ||||||||||||
| 1986 | 34.63 | a | 40.04 | 49.13 | 49.18 | 57.74 | 68.38 | 66.82 | 75.89 | 59.27 | 55.06 | 41.68 | 31.90 | 52.48 | ||||||||||||
| 1987 | 34.53 | 38.96 | 48.03 | 53.03 | a | 59.53 | 68.83 | 69.10 | 71.22 | a | 66.45 | 55.56 | 42.85 | 32.58 | a | 53.39 | ||||||||||
| 1988 | 32.50 | 41.48 | 44.97 | 50.60 | 53.32 | 61.02 | 69.98 | 66.94 | 60.47 | 57.31 | 41.22 | 35.79 | 51.30 | |||||||||||||
| 1989 | 36.89 | 26.61 | 41.52 | 52.02 | 52.98 | 63.00 | 66.11 | 64.00 | 59.67 | 47.52 | 44.10 | 32.37 | 48.90 | |||||||||||||
| 1990 | 37.44 | 36.82 | 45.48 | 52.58 | 53.65 | 61.40 | 75.29 | 72.52 | 65.72 | 47.48 | 44.72 | 25.29 | 51.53 | |||||||||||||
| 1991 | 31.31 | 43.09 | 38.42 | 45.88 | 50.40 | 57.72 | 70.94 | 71.39 | 63.82 | 51.10 | 41.85 | 36.61 | 50.21 | |||||||||||||
| 1992 | 36.13 | 42.97 | 45.85 | 52.07 | 60.26 | 69.30 | 72.47 | ----- | z | 62.23 | 54.56 | 39.78 | 35.18 | a | 51.89 | |||||||||||
| 1993 | 29.30 | c | 28.95 | 41.94 | 52.50 | ----- | z | 64.48 | 64.47 | 69.35 | 65.63 | ----- | z | ----- | z | ----- | z | 52.08 | ||||||||
| 1994 | ----- | z | ----- | z | ----- | z | ----- | z | 60.12 | n | ----- | z | 76.77 | a | 75.29 | x | 65.50 | z | 47.00 | z | 38.97 | ----- | z | 57.87 | ||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 32.69 | 38.50 | 43.46 | 49.42 | 56.63 | 64.36 | 71.51 | 70.61 | 62.99 | 52.56 | 40.37 | 33.79 | 51.14 | |||||||||||||
| S.D. | 5.84 | 4.16 | 2.59 | 2.77 | 2.99 | 3.21 | 3.03 | 3.12 | 3.03 | 2.79 | 4.21 | 4.42 | 1.31 | |||||||||||||
| SKEW | -0.82 | -0.86 | 0.01 | -0.42 | 0.09 | -0.22 | -0.25 | 0.13 | 0.30 | 0.15 | -1.53 | -1.07 | -0.07 | |||||||||||||
| MAX | 43.47 | 47.20 | 49.13 | 53.82 | 62.32 | 69.30 | 76.77 | 76.63 | 70.60 | 58.73 | 45.87 | 40.18 | 54.08 | |||||||||||||
| MIN | 16.15 | 26.61 | 37.48 | 42.82 | 50.40 | 57.72 | 64.47 | 64.00 | 58.13 | 47.48 | 25.34 | 20.89 | 48.49 | |||||||||||||
| NO YRS | 38 | 40 | 41 | 41 | 41 | 41 | 43 | 38 | 40 | 38 | 39 | 35 | 28 | |||||||||||||