| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1966 | ----- | z | ----- | z | ----- | z | ----- | z | 49.19 | 49.40 | 60.84 | 59.68 | 51.27 | 37.97 | 32.23 | 16.06 | 44.58 | d | ||||||||
| 1967 | 20.52 | 26.82 | 30.94 | 29.30 | 44.42 | 48.67 | 63.35 | 62.23 | 49.30 | 38.48 | 32.07 | 17.58 | 38.64 | |||||||||||||
| 1968 | 17.65 | 29.93 | 31.87 | a | 32.03 | 42.87 | 52.70 | 61.71 | 54.39 | 48.17 | 38.48 | 29.23 | 18.52 | 38.13 | ||||||||||||
| 1969 | 23.10 | a | 20.75 | 23.81 | 35.93 | 48.58 | 49.70 | 60.81 | 64.45 | 53.23 | 33.58 | 26.73 | ----- | z | 40.06 | a | ||||||||||
| 1970 | ----- | z | 26.75 | l | 26.89 | c | 29.93 | p | 43.87 | 52.03 | 60.94 | 63.61 | 43.83 | a | ----- | z | ----- | z | ----- | z | 48.53 | f | ||||
| 1971 | ----- | z | ----- | z | ----- | z | ----- | z | 41.61 | 51.27 | 60.32 | 60.16 | 43.67 | 34.90 | a | 26.33 | 17.48 | 41.97 | d | |||||||
| 1972 | 17.71 | 23.00 | 31.77 | 31.93 | 45.87 | 54.33 | i | 60.19 | 57.58 | 46.83 | 38.90 | 26.07 | 15.06 | 35.90 | a | |||||||||||
| 1973 | 14.19 | 23.86 | 28.55 | 34.33 | 46.42 | 53.90 | 60.06 | 62.65 | 48.10 | 40.71 | 29.10 | 24.06 | 38.83 | |||||||||||||
| 1974 | 18.81 | 22.14 | 32.39 | 32.78 | g | 43.68 | 58.93 | 63.03 | 58.74 | 51.83 | 41.42 | 32.05 | j | ----- | z | 43.44 | c | |||||||||
| 1975 | 18.87 | 23.14 | 27.81 | 30.17 | 41.65 | 50.13 | 63.87 | 57.40 | a | 51.30 | c | 35.56 | f | 25.35 | d | 24.61 | 37.66 | a | ||||||||
| 1976 | 20.07 | a | 24.03 | 23.42 | 34.03 | a | 47.81 | 53.42 | d | 64.13 | 56.64 | c | 52.43 | 39.06 | 31.43 | 20.23 | 38.89 | |||||||||
| 1977 | 20.57 | h | ----- | z | 25.19 | 39.37 | 40.84 | 58.97 | 63.58 | 60.65 | 52.30 | 42.63 | a | 30.87 | 28.19 | 44.26 | b | |||||||||
| 1978 | 27.03 | 28.96 | 36.52 | 37.77 | 42.10 | 52.10 | 62.84 | 59.32 | 50.63 | 44.00 | 28.97 | 16.55 | 40.57 | |||||||||||||
| 1979 | 10.65 | 24.32 | 31.20 | a | 36.77 | 47.06 | 55.93 | 63.94 | 62.81 | 57.93 | 45.55 | 26.20 | 24.77 | 40.59 | ||||||||||||
| 1980 | 24.35 | 28.97 | 31.42 | 39.83 | 45.29 | 49.92 | q | 66.00 | 64.16 | 56.39 | b | 44.00 | ----- | z | 27.50 | a | 42.79 | b | ||||||||
| 1981 | 23.72 | b | 29.04 | 34.48 | 42.27 | 47.84 | 56.70 | 62.10 | 68.06 | 57.67 | 42.06 | 37.52 | g | 28.23 | i | 46.39 | b | |||||||||
| 1982 | 24.89 | c | 24.36 | c | 34.71 | 35.36 | b | 45.62 | b | 56.30 | 64.52 | 68.94 | 53.33 | c | 40.53 | a | 29.37 | 24.77 | e | 41.89 | ||||||
| 1983 | 28.22 | d | 29.81 | a | 36.83 | a | 35.97 | 45.13 | a | 54.72 | a | 62.33 | a | 60.74 | 50.70 | 40.65 | 30.54 | d | 26.91 | i | 43.24 | a | ||||
| 1984 | 11.58 | e | 12.38 | 31.10 | a | 36.03 | 49.23 | 54.32 | b | 65.29 | 66.17 | b | 52.90 | a | 39.90 | a | 34.57 | 21.18 | c | 39.55 | ||||||
| 1985 | 18.23 | 21.58 | b | 30.13 | a | 43.76 | a | 51.97 | 60.17 | a | 68.06 | 66.06 | 50.69 | a | 40.41 | b | 25.45 | a | 13.10 | a | 40.80 | |||||
| 1986 | 20.87 | a | 30.57 | 36.53 | a | 37.18 | b | 43.65 | 58.43 | 59.42 | 65.16 | 46.68 | b | 38.81 | ----- | z | ----- | z | 43.73 | b | ||||||
| 1987 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 59.52 | 52.30 | 43.35 | 28.83 | a | 22.35 | h | 46.00 | h | |||
| 1988 | 14.77 | 24.17 | 29.72 | b | 37.96 | g | 44.47 | a | 58.07 | 66.45 | 61.00 | g | 50.73 | 46.03 | 30.60 | 16.94 | 38.20 | b | ||||||||
| 1989 | 12.61 | 16.11 | 32.61 | 41.27 | 44.29 | 53.00 | c | 64.13 | a | 58.29 | 50.83 | 40.06 | 28.66 | a | 22.20 | a | 38.67 | |||||||||
| 1990 | 22.72 | b | 21.11 | a | 32.90 | 41.43 | 42.52 | 57.30 | g | 63.03 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 37.29 | f | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 19.53 | 24.25 | 30.95 | 36.56 | 45.25 | 54.23 | 62.96 | 61.63 | 50.96 | 40.52 | 29.08 | 20.52 | 39.66 | |||||||||||||
| S.D. | 5.02 | 4.71 | 3.84 | 4.08 | 2.83 | 3.47 | 2.21 | 3.80 | 3.63 | 3.07 | 2.58 | 4.55 | 1.23 | |||||||||||||
| SKEW | -0.13 | -0.71 | -0.37 | -0.03 | 0.49 | 0.10 | 0.36 | 0.16 | -0.10 | -0.24 | 0.21 | 0.16 | 0.48 | |||||||||||||
| MAX | 28.22 | 30.57 | 36.83 | 43.76 | 51.97 | 60.17 | 68.06 | 68.94 | 57.93 | 46.03 | 34.57 | 28.19 | 41.89 | |||||||||||||
| MIN | 10.65 | 12.38 | 23.42 | 29.30 | 40.84 | 48.67 | 59.42 | 54.39 | 43.67 | 33.58 | 25.35 | 13.10 | 38.13 | |||||||||||||
| YRS | 20 | 20 | 22 | 19 | 24 | 21 | 24 | 23 | 24 | 22 | 19 | 17 | 10 | |||||||||||||