| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1961 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 35.22 | u | 26.39 | c | 26.39 | |
| 1962 | 19.35 | d | 27.93 | a | 33.44 | 46.69 | a | 46.82 | a | 56.63 | 61.89 | 60.55 | a | 57.08 | 45.84 | ----- | z | 26.62 | r | 45.62 | ||||||
| 1963 | 23.29 | 39.73 | 36.81 | 39.69 | a | 51.00 | e | 54.86 | a | ----- | z | 64.40 | f | 60.48 | c | 46.80 | h | 36.14 | i | 27.10 | 41.62 | |||||
| 1964 | 23.10 | 23.74 | 29.45 | c | 39.29 | d | 46.65 | 56.12 | 63.12 | a | 60.63 | 54.70 | b | 47.60 | 35.15 | g | 28.55 | 42.99 | ||||||||
| 1965 | 25.78 | f | 34.17 | b | 35.14 | c | 44.50 | 46.53 | b | 56.78 | 62.61 | 60.72 | a | 49.87 | d | 48.63 | 36.88 | b | 24.79 | e | 45.51 | |||||
| 1966 | 25.65 | d | 26.77 | 37.19 | m | 45.02 | 53.66 | 56.41 | c | 63.15 | 63.61 | 59.16 | a | 45.79 | 37.22 | 28.63 | 45.91 | |||||||||
| 1967 | 29.72 | b | 33.70 | a | 34.77 | 35.87 | 49.15 | a | 57.83 | a | 66.26 | 68.74 | 60.57 | a | 44.92 | 36.07 | b | 25.50 | 45.26 | |||||||
| 1968 | 25.97 | a | 37.81 | c | 38.03 | a | 39.05 | a | 48.84 | b | 58.22 | a | ----- | z | 61.63 | 55.90 | a | 44.57 | a | 36.33 | a | 26.32 | a | 42.97 | ||
| 1969 | 25.24 | 24.79 | 31.20 | a | 43.97 | a | 53.70 | a | 58.55 | a | 63.52 | d | 63.97 | b | 58.00 | 41.55 | 35.15 | 29.47 | a | 44.09 | ||||||
| 1970 | 28.81 | 35.09 | a | 35.27 | a | 36.36 | a | 50.12 | a | 60.77 | 66.76 | b | 65.66 | c | 53.70 | j | 39.33 | m | 36.81 | a | 22.92 | 43.86 | ||||
| 1971 | 28.40 | a | 32.27 | d | 32.40 | a | 41.31 | d | 51.48 | d | 55.19 | a | 65.42 | 67.47 | 50.32 | b | 42.27 | 34.71 | a | 23.27 | a | 43.71 | ||||
| 1972 | 22.31 | b | 30.59 | a | 40.52 | a | 40.05 | b | 51.57 | b | 58.64 | a | 65.07 | b | 65.69 | b | 49.73 | b | 45.57 | a | 34.78 | c | 19.82 | 43.69 | ||
| 1973 | 26.00 | 34.12 | 36.80 | a | 43.63 | c | 53.87 | d | 57.45 | b | 66.38 | b | 64.24 | 55.70 | h | 44.92 | a | 33.00 | b | 31.74 | 44.74 | |||||
| 1974 | 24.83 | b | 32.02 | 36.65 | 42.85 | 48.58 | 61.40 | 63.35 | 63.15 | 57.98 | 44.48 | 34.50 | 27.05 | 44.74 | ||||||||||||
| 1975 | 23.08 | 27.52 | 33.85 | 36.40 | a | 49.17 | a | 54.88 | 67.76 | 59.31 | 57.93 | a | 45.13 | 33.23 | 29.58 | 43.15 | ||||||||||
| 1976 | 25.90 | a | 28.72 | 34.35 | 42.60 | a | 52.90 | 54.71 | d | 65.40 | a | 59.56 | 57.88 | 45.93 | a | 38.43 | c | 27.97 | a | 44.53 | ||||||
| 1977 | 17.43 | b | 33.07 | 34.69 | 47.12 | 45.50 | b | 61.69 | a | 63.33 | a | 65.84 | b | 54.57 | b | 46.55 | 34.38 | b | 29.48 | 44.47 | ||||||
| 1978 | 28.47 | b | 31.21 | 43.23 | 43.03 | 48.29 | 57.36 | a | 65.17 | b | 62.43 | a | 53.48 | a | 47.82 | a | 29.45 | 21.87 | a | 44.32 | ||||||
| 1979 | 14.18 | 30.27 | 37.62 | a | 43.35 | c | 52.31 | e | 58.71 | a | 64.42 | a | 63.68 | 58.71 | a | 50.30 | a | 29.91 | a | 29.23 | 44.39 | |||||
| 1980 | 26.15 | 36.19 | 36.31 | 46.74 | a | 52.66 | 55.48 | a | 65.55 | a | 60.72 | d | 57.57 | 45.77 | 36.65 | 30.10 | 45.82 | |||||||||
| 1981 | 30.38 | a | 28.89 | 38.82 | 45.71 | a | 50.87 | d | 56.47 | 62.55 | b | 65.87 | 56.32 | 44.05 | a | 37.13 | 30.52 | d | 45.63 | |||||||
| 1982 | 20.40 | 27.73 | 36.13 | ----- | z | 41.63 | 58.95 | 63.02 | 64.48 | 53.37 | 44.84 | 29.68 | 24.82 | 42.28 | ||||||||||||
| 1983 | 29.71 | 33.95 | 39.06 | 40.02 | 51.05 | 54.97 | 61.47 | 64.84 | 54.37 | 46.84 | 35.75 | 21.63 | 44.47 | |||||||||||||
| 1984 | 18.06 | 25.28 | 36.13 | 40.72 | 50.94 | 54.68 | 66.60 | 64.40 | 53.68 | 41.21 | 34.32 | 20.29 | 42.19 | |||||||||||||
| 1985 | 18.79 | 23.48 | 32.87 | 46.38 | 51.60 | 59.23 | 69.13 | 60.65 | 48.62 | 42.76 | 23.78 | 13.94 | 40.94 | |||||||||||||
| 1986 | 28.21 | 34.25 | 42.13 | 43.25 | 51.53 | a | 62.52 | 61.50 | 67.90 | 50.13 | 46.79 | 37.43 | 27.35 | 46.08 | ||||||||||||
| 1987 | 23.44 | 32.96 | 38.97 | 49.45 | a | 53.87 | a | 60.37 | 60.81 | 62.16 | 58.85 | 49.63 | 33.82 | b | 26.07 | b | 45.87 | |||||||||
| 1988 | 22.79 | 32.83 | 38.06 | 46.82 | 49.50 | 58.73 | 66.34 | 63.58 | 55.85 | 52.53 | 33.12 | 24.24 | 45.37 | |||||||||||||
| 1989 | 20.82 | 19.34 | 38.97 | a | 47.23 | 49.65 | 59.88 | 64.61 | 61.32 | 55.18 | 44.47 | 33.82 | 28.82 | 43.68 | ||||||||||||
| 1990 | 31.48 | a | 28.28 | a | 39.81 | 50.52 | 50.35 | 61.65 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 43.68 | |||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 24.36 | 30.58 | 36.48 | 43.13 | 50.13 | 57.90 | 64.43 | 63.44 | 55.40 | 45.80 | 34.25 | 25.98 | 44.34 | |||||||||||||
| S.D. | 4.36 | 4.65 | 3.18 | 3.88 | 2.82 | 2.37 | 2.10 | 2.58 | 3.46 | 2.61 | 3.24 | 3.96 | 1.30 | |||||||||||||
| SKEW | -0.39 | -0.33 | -0.03 | -0.16 | -0.97 | 0.29 | 0.23 | 0.24 | -0.47 | 0.53 | -1.52 | -1.08 | -0.93 | |||||||||||||
| MAX | 31.48 | 39.73 | 43.23 | 50.52 | 53.87 | 62.52 | 69.13 | 68.74 | 60.57 | 52.53 | 38.43 | 31.74 | 46.08 | |||||||||||||
| MIN | 14.18 | 19.34 | 29.45 | 35.87 | 41.63 | 54.68 | 60.81 | 59.31 | 48.62 | 41.21 | 23.78 | 13.94 | 40.94 | |||||||||||||
| NO YRS | 28 | 29 | 28 | 28 | 29 | 29 | 26 | 27 | 26 | 26 | 25 | 28 | 19 | |||||||||||||