| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1956 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 41.33 | o | 34.48 | d | 34.48 | |
| 1957 | 29.33 | a | 42.08 | b | 51.29 | 57.46 | b | 68.68 | 79.33 | 88.97 | a | 87.52 | 78.24 | a | 61.24 | b | 41.28 | a | 40.03 | 60.45 | ||||||
| 1958 | 31.29 | 44.00 | 46.19 | 56.62 | d | 78.73 | e | 82.03 | 88.03 | a | 91.35 | 79.93 | a | 69.26 | 45.28 | a | 43.55 | 63.02 | ||||||||
| 1959 | 40.10 | a | 39.52 | a | 50.77 | 61.77 | 66.37 | a | 83.90 | 91.32 | 86.48 | 72.79 | a | 63.16 | 51.74 | c | 39.30 | a | 62.27 | |||||||
| 1960 | 28.75 | c | 30.50 | k | 50.30 | a | 61.57 | 72.03 | b | 84.37 | 95.00 | b | 88.03 | 82.80 | 65.39 | 48.40 | 31.90 | 64.41 | ||||||||
| 1961 | 38.13 | 43.18 | 51.84 | 60.29 | b | 72.07 | a | 86.45 | a | 92.19 | 90.90 | a | 71.03 | 61.65 | 43.43 | 35.23 | 62.20 | |||||||||
| 1962 | 27.97 | 37.25 | 45.32 | 66.69 | d | 68.52 | 81.03 | 88.10 | 86.32 | 82.47 | 71.07 | c | 52.97 | 40.59 | d | 62.36 | ||||||||||
| 1963 | 32.71 | 50.52 | c | 51.81 | d | 54.29 | f | 75.07 | c | 76.68 | b | 90.73 | a | 90.52 | 81.93 | 70.29 | 43.93 | 27.74 | 62.90 | |||||||
| 1964 | 26.33 | a | 27.79 | a | 37.62 | b | 56.20 | 69.58 | 75.30 | ----- | z | 87.74 | 78.93 | 70.23 | 45.83 | 38.71 | 55.84 | |||||||||
| 1965 | 35.84 | 42.00 | 48.06 | 59.77 | 66.71 | 77.60 | 87.35 | 83.32 | 67.73 | 70.13 | 49.97 | a | 29.55 | 59.84 | ||||||||||||
| 1966 | 34.42 | 32.75 | 49.14 | b | 62.47 | 75.65 | 81.13 | 91.71 | 88.32 | 79.10 | 62.97 | 50.23 | 30.13 | a | 61.50 | |||||||||||
| 1967 | 37.13 | a | 42.82 | 49.23 | 53.53 | 67.19 | 73.34 | a | 89.45 | b | 91.03 | 80.79 | a | 64.19 | 51.59 | a | 28.32 | 60.72 | ||||||||
| 1968 | 26.90 | 35.52 | 51.45 | 54.62 | a | 67.48 | 79.17 | 90.55 | 80.68 | 74.28 | a | ----- | z | 42.73 | 33.87 | 57.93 | ||||||||||
| 1969 | ----- | z | 35.11 | a | 38.03 | 61.70 | 78.13 | 75.03 | a | 89.94 | 92.13 | 81.17 | 55.69 | b | 50.14 | b | 39.42 | 63.32 | ||||||||
| 1970 | 37.32 | 48.21 | 48.13 | 52.90 | 70.16 | 81.03 | 89.06 | 92.26 | 74.28 | a | 58.32 | 47.27 | 33.87 | 61.07 | ||||||||||||
| 1971 | 33.71 | 39.25 | 47.13 | 58.03 | 68.77 | 78.21 | b | 89.77 | a | 91.69 | b | 74.36 | b | 57.00 | b | 44.36 | b | 31.84 | 59.51 | |||||||
| 1972 | 34.16 | 41.66 | 56.52 | 58.30 | 73.83 | a | 82.30 | 89.17 | a | 89.58 | 73.80 | 61.90 | 43.73 | ----- | z | 64.09 | ||||||||||
| 1973 | 26.19 | 32.18 | 43.63 | a | 55.80 | 71.45 | 80.57 | 88.41 | d | 87.33 | d | 71.58 | d | 63.74 | 45.47 | 37.16 | 58.63 | |||||||||
| 1974 | 29.39 | 33.82 | 50.23 | 56.93 | 69.35 | 84.00 | 90.20 | a | 86.29 | c | 79.50 | b | 65.29 | 48.93 | b | 32.81 | 60.56 | |||||||||
| 1975 | 29.62 | b | 34.85 | a | 44.35 | 49.67 | c | 62.52 | 73.00 | 90.19 | 84.28 | b | 78.10 | 62.06 | 43.24 | a | 37.10 | b | 57.42 | |||||||
| 1976 | 29.43 | a | 32.59 | 36.94 | 56.03 | 72.29 | 76.90 | a | 90.23 | 83.16 | 78.57 | 63.90 | 51.87 | 40.58 | 59.37 | |||||||||||
| 1977 | 30.39 | 37.89 | 44.77 | 65.45 | a | 63.81 | 86.00 | 88.67 | d | 85.66 | b | 75.10 | 64.97 | 48.00 | 40.63 | a | 60.94 | |||||||||
| 1978 | 37.32 | 42.32 | 54.42 | 57.87 | 64.55 | 79.47 | 90.16 | 85.32 | 72.72 | a | 68.27 | a | 40.93 | a | 31.53 | a | 60.41 | |||||||||
| 1979 | 21.84 | 33.93 | 43.34 | b | 57.79 | a | 69.74 | 79.83 | 89.13 | 87.06 | 83.59 | a | 68.00 | a | 42.10 | 38.13 | a | 59.54 | ||||||||
| 1980 | 35.80 | a | 40.93 | 47.27 | a | 62.33 | 66.00 | a | 78.60 | 90.74 | 86.50 | a | 78.20 | 63.43 | a | 49.43 | 34.71 | 61.16 | ||||||||
| 1981 | 33.29 | 39.79 | 52.65 | 62.10 | 65.97 | 79.07 | a | 90.66 | b | 92.32 | 81.67 | 60.47 | a | 51.50 | 42.03 | 62.63 | ||||||||||
| 1982 | 31.26 | 32.00 | 48.74 | 54.37 | 66.58 | 77.77 | 86.13 | 89.58 | 72.57 | 57.68 | 43.27 | 33.23 | 57.76 | |||||||||||||
| 1983 | 38.48 | 41.75 | 49.52 | 51.27 | 63.65 | 76.47 | 87.97 | 86.48 | 77.40 | 62.94 | 44.47 | 31.97 | 59.36 | |||||||||||||
| 1984 | 25.03 | a | 28.72 | 43.74 | 57.13 | 71.52 | 76.10 | 89.06 | 85.81 | 74.27 | 54.32 | 43.79 | a | 30.13 | 56.64 | |||||||||||
| 1985 | 21.90 | 26.29 | d | 35.32 | 62.67 | 71.83 | a | 80.00 | 88.52 | 84.32 | 69.43 | 61.65 | 36.23 | 22.16 | 55.03 | |||||||||||
| 1986 | 28.06 | 43.71 | 56.94 | 55.53 | 66.10 | 84.77 | 84.19 | 88.74 | 69.27 | 61.19 | 47.30 | 35.90 | 60.14 | |||||||||||||
| 1987 | 24.00 | 39.61 | 50.32 | 66.73 | 71.10 | 80.57 | 84.29 | 86.52 | 81.77 | 69.13 | 45.00 | 33.45 | 61.04 | |||||||||||||
| 1988 | 26.87 | 36.59 | 48.65 | 62.80 | 70.23 | a | 85.03 | 91.68 | 88.32 | 74.33 | 72.00 | 45.50 | 27.00 | 60.75 | ||||||||||||
| 1989 | 23.42 | 27.07 | 47.90 | 63.57 | 69.58 | 78.20 | 92.35 | 87.32 | 78.13 | 64.29 | 48.70 | 33.16 | 59.48 | |||||||||||||
| 1990 | 37.45 | 35.86 | 52.35 | 64.13 | 66.32 | 79.87 | 89.81 | 87.55 | 82.33 | 62.74 | 47.50 | 24.52 | 60.87 | |||||||||||||
| 1991 | 23.58 | 35.18 | 48.42 | 54.63 | 62.87 | 77.10 | 88.81 | 87.77 | 74.90 | 65.10 | 42.97 | 27.10 | 57.37 | |||||||||||||
| 1992 | 24.61 | 40.59 | 57.74 | 67.33 | 75.29 | 81.20 | 84.48 | 88.87 | 76.63 | 66.65 | 38.57 | 29.58 | 60.96 | |||||||||||||
| 1993 | 24.23 | 28.14 | 44.81 | 55.47 | 70.94 | 72.57 | 77.84 | 82.16 | 75.17 | 61.23 | 41.77 | 33.13 | 55.62 | |||||||||||||
| 1994 | 39.42 | 38.79 | 54.55 | 62.30 | 74.35 | 83.43 | 90.87 | 89.97 | 80.67 | 59.61 | 37.80 | 35.39 | 62.26 | |||||||||||||
| 1995 | 35.16 | 46.57 | 49.42 | 56.90 | 62.45 | 74.07 | 86.23 | 87.74 | 77.73 | 62.23 | 52.63 | 42.58 | 61.14 | |||||||||||||
| 1996 | 37.35 | 35.38 | 50.81 | 58.27 | 66.61 | 81.63 | 89.48 | 87.29 | 72.07 | 62.94 | 49.53 | 38.84 | 60.85 | |||||||||||||
| 1997 | 34.77 | 35.71 | 52.68 | 55.70 | 71.06 | 78.73 | 83.71 | 85.03 | 75.27 | 60.94 | 46.77 | 28.74 | 59.09 | |||||||||||||
| 1998 | 38.35 | 40.71 | 45.42 | 56.17 | 67.06 | 70.70 | 89.48 | 87.06 | 77.63 | 61.10 | 49.70 | 31.00 | a | 59.53 | ||||||||||||
| 1999 | 39.81 | 40.57 | 54.23 | 54.77 | 64.61 | 76.70 | 87.90 | 86.42 | 76.07 | 68.84 | 56.77 | 36.06 | 61.90 | |||||||||||||
| 2000 | 39.58 | 44.69 | 50.84 | 64.07 | 70.68 | 81.67 | 91.35 | 90.29 | 75.50 | 62.77 | 38.30 | 34.87 | 62.05 | |||||||||||||
| 2001 | 24.26 | 33.79 | 50.35 | 57.80 | 73.52 | 80.17 | 90.32 | 90.35 | 82.47 | 67.06 | 49.87 | 26.39 | 60.53 | |||||||||||||
| 2002 | 28.90 | 24.93 | 41.13 | 60.03 | 68.90 | 81.10 | 92.74 | 86.74 | 76.30 | 59.71 | 44.63 | 39.48 | 58.72 | |||||||||||||
| 2003 | 42.61 | 37.46 | 51.87 | 59.63 | 69.42 | 80.17 | 94.48 | 89.23 | 76.73 | 69.87 | 39.53 | 38.61 | 62.47 | |||||||||||||
| 2004 | 22.45 | 29.17 | 52.06 | ----- | z | 67.87 | 79.10 | 87.42 | 83.90 | 74.97 | 61.84 | 45.37 | 37.32 | 58.32 | ||||||||||||
| 2005 | 31.81 | 28.64 | 42.68 | 57.73 | 67.68 | 74.40 | 90.84 | 86.52 | 75.50 | 64.39 | 48.30 | 33.19 | 58.47 | |||||||||||||
| 2006 | 36.35 | 35.25 | 46.00 | a | 61.13 | 72.29 | 84.71 | i | 91.78 | m | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 50.21 | |||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 31.57 | 37.08 | 48.34 | 58.88 | 69.34 | 79.30 | 89.16 | 87.55 | 76.73 | 63.81 | 46.09 | 34.23 | 60.13 | |||||||||||||
| S.D. | 5.80 | 5.94 | 5.04 | 4.11 | 3.87 | 3.61 | 2.91 | 2.68 | 3.89 | 4.14 | 4.43 | 4.99 | 1.88 | |||||||||||||
| SKEW | -0.04 | -0.09 | -0.63 | 0.14 | 0.29 | -0.18 | -1.30 | -0.22 | -0.17 | 0.06 | -0.08 | -0.22 | -0.87 | |||||||||||||
| MAX | 42.61 | 50.52 | 57.74 | 67.33 | 78.73 | 86.45 | 95.00 | 92.32 | 83.59 | 72.00 | 56.77 | 43.55 | 63.02 | |||||||||||||
| MIN | 21.84 | 24.93 | 35.32 | 49.67 | 62.45 | 70.70 | 77.84 | 80.68 | 67.73 | 54.32 | 36.23 | 22.16 | 55.03 | |||||||||||||
| NO YRS | 49 | 49 | 50 | 48 | 50 | 49 | 48 | 49 | 49 | 48 | 49 | 49 | 42 | |||||||||||||