| 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 | 43.00 | u | 35.87 | a | 35.87 | |
| 1962 | 33.00 | c | 38.48 | a | 45.35 | 64.50 | 61.00 | a | 75.50 | 82.42 | 81.06 | 78.93 | 62.61 | ----- | z | 40.38 | r | 62.29 | ||||||||
| 1963 | 38.97 | 49.82 | 48.32 | 51.62 | a | 64.69 | e | 70.62 | a | ----- | z | 85.88 | f | 80.37 | c | 64.91 | h | 47.00 | i | 37.19 | 55.20 | |||||
| 1964 | 34.35 | 39.10 | 43.52 | 56.10 | 63.90 | 71.17 | 82.67 | a | 80.77 | 77.32 | b | 68.32 | 46.78 | g | 36.68 | 59.45 | ||||||||||
| 1965 | 35.76 | f | 45.35 | b | 48.71 | c | 57.87 | 63.23 | a | 73.37 | 82.13 | 79.37 | a | 69.26 | c | 69.10 | 47.34 | a | 35.73 | e | 61.04 | |||||
| 1966 | 37.00 | d | 38.14 | 52.50 | m | 62.43 | 72.52 | 71.93 | b | 83.19 | 83.52 | 77.47 | 63.90 | 46.53 | 36.16 | 61.16 | ||||||||||
| 1967 | 38.13 | a | 45.00 | a | 46.10 | 47.53 | 66.52 | 74.52 | a | 86.77 | 90.35 | 81.28 | a | 62.16 | 48.97 | a | 36.58 | 60.33 | ||||||||
| 1968 | 36.27 | a | 49.54 | c | 54.23 | 56.00 | a | 65.40 | a | 76.45 | a | ----- | z | 77.65 | 75.00 | a | 60.47 | a | 44.72 | a | 35.03 | 57.34 | ||||
| 1969 | 34.13 | 36.07 | 44.60 | a | 57.00 | a | 69.83 | a | 72.90 | a | 83.19 | d | 85.83 | b | 76.90 | 55.42 | 50.53 | 38.80 | a | 58.77 | ||||||
| 1970 | 36.65 | 46.63 | a | 47.47 | a | 50.76 | a | 67.77 | a | 76.53 | 87.47 | a | 88.38 | b | 73.24 | i | 56.40 | k | 45.38 | a | 33.06 | 58.01 | ||||
| 1971 | 38.37 | a | 44.46 | d | 43.20 | a | 55.33 | c | 66.43 | c | 70.07 | 84.52 | 87.94 | 69.62 | a | 58.29 | 45.34 | a | 33.20 | a | 58.06 | |||||
| 1972 | 33.31 | b | 41.11 | a | 53.37 | a | 53.20 | 70.20 | a | 76.17 | a | 84.57 | a | 85.72 | b | 68.14 | b | 62.70 | a | 44.26 | c | 29.52 | 58.52 | |||
| 1973 | 34.55 | 42.86 | 48.23 | a | 58.71 | b | 70.90 | a | 74.76 | a | 86.86 | b | 83.97 | 72.54 | f | 60.37 | a | 41.66 | a | 39.23 | 58.37 | |||||
| 1974 | 34.76 | b | 42.18 | 46.55 | 55.23 | 63.39 | 81.57 | 82.87 | 83.68 | 80.97 | 64.77 | 48.50 | 36.81 | 60.11 | ||||||||||||
| 1975 | 34.42 | 38.14 | 44.19 | 47.90 | a | 65.57 | a | 71.70 | 84.65 | 78.23 | 79.97 | a | 58.42 | 44.60 | 39.81 | 57.30 | ||||||||||
| 1976 | 36.63 | a | 38.66 | 45.65 | 55.13 | 70.32 | 70.96 | b | 84.07 | a | 74.10 | 75.80 | 64.60 | a | 54.96 | c | 43.07 | a | 59.50 | |||||||
| 1977 | 30.60 | a | 45.79 | 46.71 | 65.53 | 58.00 | a | 79.76 | a | 82.27 | a | 84.62 | b | 70.32 | b | 63.13 | 44.62 | a | 38.97 | 59.19 | ||||||
| 1978 | 36.20 | a | 39.39 | 56.00 | 53.20 | 62.39 | 73.97 | 82.83 | b | 80.52 | 71.03 | a | 69.37 | a | 43.27 | 32.47 | a | 58.39 | ||||||||
| 1979 | 26.10 | 38.61 | 49.17 | a | 56.14 | b | 67.79 | c | 77.76 | a | 85.30 | a | 79.94 | 78.72 | a | 64.60 | a | 42.83 | a | 38.19 | 58.76 | |||||
| 1980 | 35.19 | 44.24 | 47.52 | 61.48 | a | 65.48 | 70.83 | 83.81 | 80.74 | d | 76.23 | 62.71 | 48.10 | 40.74 | 59.76 | |||||||||||
| 1981 | 38.65 | 42.18 | 51.55 | 58.90 | a | 64.16 | 73.50 | 82.39 | 87.87 | 76.23 | 58.90 | a | 47.60 | 39.43 | c | 60.11 | ||||||||||
| 1982 | 31.35 | 37.36 | 46.90 | ----- | z | 56.71 | 74.03 | 80.26 | 84.29 | 70.37 | 59.90 | 40.47 | 33.74 | 55.94 | ||||||||||||
| 1983 | 37.58 | 41.43 | 46.71 | 52.13 | 66.87 | 71.47 | 78.52 | 82.81 | 73.33 | 64.23 | 43.97 | 30.03 | 57.42 | |||||||||||||
| 1984 | 28.45 | 35.52 | 46.29 | 52.40 | 65.68 | 69.33 | 85.45 | 83.84 | 71.20 | 53.77 | 41.97 | 31.29 | 55.43 | |||||||||||||
| 1985 | 28.87 | 36.79 | 44.55 | 62.50 | 66.71 | 77.70 | 88.48 | 81.13 | 64.83 | 59.84 | 35.63 | 26.19 | 56.10 | |||||||||||||
| 1986 | 37.55 | 43.43 | 54.97 | 58.13 | 67.29 | 80.67 | 80.74 | 88.03 | 65.43 | 64.74 | 48.37 | 36.23 | 60.46 | |||||||||||||
| 1987 | 34.68 | 42.46 | 49.61 | 67.30 | 70.13 | a | 77.77 | 78.45 | 83.10 | 80.77 | 70.71 | 44.43 | b | 33.67 | a | 61.09 | ||||||||||
| 1988 | 32.94 | 45.34 | 53.10 | 60.97 | 65.87 | 75.27 | 86.84 | 84.90 | 77.07 | 72.90 | 41.80 | 35.03 | 61.00 | |||||||||||||
| 1989 | 32.10 | 30.54 | 48.10 | 62.13 | 64.45 | 76.83 | 85.03 | 79.23 | 74.90 | 60.19 | 47.53 | 43.16 | 58.68 | |||||||||||||
| 1990 | 41.48 | 42.59 | a | 56.35 | 67.83 | 64.68 | 78.90 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 58.64 | ||||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 34.72 | 41.42 | 48.46 | 57.43 | 65.79 | 74.69 | 83.68 | 83.02 | 74.67 | 62.93 | 45.34 | 35.92 | 58.89 | |||||||||||||
| S.D. | 3.49 | 4.34 | 3.82 | 5.46 | 3.59 | 3.33 | 2.55 | 3.79 | 4.86 | 4.57 | 3.80 | 3.95 | 1.56 | |||||||||||||
| SKEW | -0.55 | -0.17 | 0.72 | 0.15 | -0.50 | 0.28 | -0.21 | -0.14 | -0.44 | 0.25 | 0.00 | -0.33 | -0.59 | |||||||||||||
| MAX | 41.48 | 49.82 | 56.35 | 67.83 | 72.52 | 81.57 | 88.48 | 90.35 | 81.28 | 72.90 | 54.96 | 43.16 | 61.09 | |||||||||||||
| MIN | 26.10 | 30.54 | 43.20 | 47.53 | 56.71 | 69.33 | 78.45 | 74.10 | 64.83 | 53.77 | 35.63 | 26.19 | 55.43 | |||||||||||||
| NO YRS | 28 | 29 | 28 | 28 | 29 | 29 | 26 | 27 | 26 | 26 | 25 | 28 | 19 | |||||||||||||