| 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 | 28.17 | o | 23.70 | d | 23.70 | |
| 1957 | 19.03 | a | 31.83 | b | 40.37 | 45.54 | c | 55.52 | 63.87 | 70.85 | a | 70.23 | 59.16 | a | 47.24 | b | 31.29 | a | 28.89 | 46.98 | ||||||
| 1958 | 21.05 | 35.14 | 36.19 | 44.92 | e | 62.44 | e | 65.87 | 70.23 | a | 73.56 | 61.16 | a | 50.61 | 33.88 | a | 33.45 | 49.04 | ||||||||
| 1959 | 30.75 | a | 30.35 | a | 38.52 | 47.77 | 51.28 | a | 66.12 | 71.32 | 68.65 | 57.52 | a | 47.74 | 34.93 | c | 25.17 | a | 47.51 | |||||||
| 1960 | 18.09 | c | 18.97 | l | 37.60 | a | 47.23 | 54.47 | b | 65.60 | 75.22 | b | 67.73 | 63.72 | 48.50 | 36.88 | 20.26 | 48.66 | ||||||||
| 1961 | 24.68 | 33.36 | 38.95 | 44.93 | b | 56.86 | b | 68.79 | a | 74.34 | 73.82 | a | 56.25 | 47.02 | 33.83 | 27.11 | 48.33 | |||||||||
| 1962 | 17.97 | 28.50 | 34.85 | 51.13 | d | 55.58 | 64.45 | 70.69 | 68.76 | 63.17 | 54.07 | c | 39.80 | 29.74 | d | 48.23 | ||||||||||
| 1963 | 21.18 | 39.56 | c | 39.37 | d | 44.33 | f | 61.25 | c | 61.52 | b | 73.15 | a | 72.34 | 65.07 | 54.95 | 35.38 | 20.76 | 49.50 | |||||||
| 1964 | 16.32 | a | 15.18 | a | 25.36 | b | 45.03 | 55.66 | 61.70 | ----- | z | 69.63 | 59.48 | 51.18 | 36.45 | b | 30.77 | 42.43 | ||||||||
| 1965 | 27.73 | 31.20 | 34.87 | 49.25 | 53.35 | 62.85 | 70.48 | 67.39 | 53.55 | 51.00 | 39.19 | a | 20.37 | 46.77 | ||||||||||||
| 1966 | 24.52 | 22.46 | 35.60 | b | 46.12 | 58.53 | 63.20 | 73.44 | 68.53 | 62.03 | a | 45.69 | 38.02 | a | 20.73 | a | 46.57 | |||||||||
| 1967 | 26.93 | a | 32.52 | 37.00 | 40.97 | 53.32 | 60.74 | a | 71.09 | b | 71.84 | 62.95 | a | 48.65 | 38.59 | a | 18.66 | 46.94 | ||||||||
| 1968 | 14.82 | 24.57 | 39.61 | 42.59 | a | 52.48 | 63.32 | 73.16 | 65.82 | 57.93 | a | ----- | z | 33.72 | 24.81 | 44.80 | ||||||||||
| 1969 | ----- | z | 23.74 | a | 25.97 | 48.05 | 61.27 | 60.91 | c | 71.90 | 73.37 | 64.33 | 43.62 | c | 36.43 | b | 29.62 | a | 49.02 | |||||||
| 1970 | 28.89 | 36.55 | 36.68 | 40.82 | 54.52 | 63.87 | 70.84 | 73.45 | 56.40 | a | 43.13 | 38.32 | 25.00 | 47.37 | ||||||||||||
| 1971 | 25.90 | 30.00 | 35.60 | 45.45 | 54.81 | b | 62.30 | b | 72.02 | a | 73.28 | b | 57.02 | b | 44.41 | b | 33.68 | b | 22.37 | 46.40 | ||||||
| 1972 | 25.50 | a | 31.50 | 43.23 | 45.17 | 57.95 | c | 66.83 | 71.33 | a | 71.26 | b | 57.63 | 49.52 | 35.98 | ----- | z | 50.54 | ||||||||
| 1973 | 16.10 | 22.64 | 35.08 | a | 43.98 | 57.50 | 64.82 | 72.12 | e | 70.15 | d | 57.04 | d | 48.76 | 36.48 | 27.61 | 46.02 | |||||||||
| 1974 | 20.19 | 21.02 | 39.37 | 44.85 | 54.94 | 67.10 | 72.88 | a | 67.95 | c | 60.50 | b | 49.63 | 36.54 | c | 23.19 | 46.51 | |||||||||
| 1975 | 18.82 | c | 25.93 | a | 34.44 | 39.06 | d | 48.73 | 58.30 | 73.44 | 66.64 | b | 58.33 | 46.55 | 31.71 | a | 27.64 | b | 44.13 | |||||||
| 1976 | 19.30 | a | 19.91 | 24.90 | 44.28 | 57.66 | 60.90 | a | 72.26 | 66.24 | 61.40 | 46.24 | 36.78 | 25.94 | 44.65 | |||||||||||
| 1977 | 17.94 | 24.98 | 33.60 | 48.84 | b | 51.13 | 68.93 | 70.90 | f | 69.76 | b | 59.02 | 49.06 | 36.93 | 32.53 | a | 44.79 | |||||||||
| 1978 | 30.13 | 33.55 | 42.40 | 45.43 | 50.73 | 61.68 | 70.65 | 66.68 | a | 57.43 | a | 50.30 | a | 29.95 | a | 20.88 | a | 46.65 | ||||||||
| 1979 | 10.27 | 21.82 | 32.98 | b | 44.89 | c | 54.15 | 62.53 | 71.05 | 70.48 | 63.76 | a | 51.17 | a | 29.98 | 25.55 | b | 44.89 | ||||||||
| 1980 | 26.57 | a | 30.55 | 36.97 | a | 47.88 | 52.98 | a | 60.85 | 70.37 | 65.80 | a | 61.40 | 47.45 | a | 36.02 | 24.66 | 46.79 | ||||||||
| 1981 | 26.11 | 26.75 | 40.31 | 47.32 | 52.29 | 61.29 | a | 71.50 | b | 73.06 | 64.35 | 47.10 | a | 40.27 | 32.50 | 48.57 | ||||||||||
| 1982 | 21.08 | 21.23 | 39.10 | 43.10 | 53.48 | 63.42 | 71.32 | 75.35 | 60.68 | 46.84 | 34.43 | 26.52 | 46.38 | |||||||||||||
| 1983 | 31.15 | 34.02 | 40.90 | 41.80 | 52.92 | 63.77 | 72.66 | 73.34 | 63.20 | 51.16 | 36.43 | 24.03 | 48.78 | |||||||||||||
| 1984 | 18.65 | a | 19.52 | 34.50 | 44.97 | 58.35 | 62.62 | 73.23 | 70.26 | 58.68 | 42.55 | 34.86 | a | 19.73 | 44.83 | |||||||||||
| 1985 | 11.40 | 13.81 | d | 23.77 | 48.07 | 56.80 | a | 63.17 | 72.65 | 65.98 | 55.45 | 46.15 | 27.65 | 15.47 | 41.70 | |||||||||||
| 1986 | 18.15 | 35.89 | 44.84 | 44.75 | 52.60 | 68.33 | 67.85 | 71.85 | 54.88 | 47.31 | 36.03 | 26.48 | 47.41 | |||||||||||||
| 1987 | 14.31 | 31.38 | 38.48 | 49.98 | 57.71 | 64.55 | 68.13 | 68.03 | 61.82 | 51.32 | 35.03 | 22.90 | 46.97 | |||||||||||||
| 1988 | 16.68 | 25.86 | 36.71 | 47.91 | a | 55.32 | a | 68.27 | 73.63 | 69.66 | 57.58 | 54.06 | 35.92 | 18.68 | 46.69 | |||||||||||
| 1989 | 12.48 | 16.79 | 38.39 | 50.13 | 54.52 | 62.28 | 74.69 | 69.82 | 60.52 | 48.94 | 36.47 | 23.69 | 45.73 | |||||||||||||
| 1990 | 26.94 | 25.27 | 40.66 | 51.10 | 52.61 | 63.62 | 72.56 | 69.85 | 65.73 | 47.47 | 36.65 | 14.00 | 47.21 | |||||||||||||
| 1991 | 14.95 | 25.91 | 38.32 | 43.42 | 50.79 | 62.18 | 71.40 | 71.37 | 59.43 | 48.58 | 34.35 | 18.42 | 44.93 | |||||||||||||
| 1992 | 14.11 | 30.43 | 44.65 | 52.18 | 59.66 | 65.48 | 68.35 | 71.15 | 59.35 | 50.82 | 28.28 | 18.79 | 46.94 | |||||||||||||
| 1993 | 15.89 | 20.11 | 35.02 | 44.45 | 57.92 | 58.93 | 62.21 | 65.97 | 58.00 | 47.19 | 28.47 | 23.98 | 43.18 | |||||||||||||
| 1994 | 30.85 | 28.43 | 41.53 | 49.17 | 58.95 | 66.07 | 72.42 | 72.31 | 62.72 | 47.19 | 28.95 | 27.27 | 48.82 | |||||||||||||
| 1995 | 27.87 | 35.32 | 39.58 | 44.63 | 52.00 | 59.92 | 69.26 | 69.32 | 61.10 | 45.87 | 40.92 | 33.35 | 48.26 | |||||||||||||
| 1996 | 28.56 | 25.22 | 38.87 | 45.77 | 54.11 | 65.47 | 72.11 | 69.19 | 56.93 | 48.45 | 38.62 | 30.73 | 47.84 | |||||||||||||
| 1997 | 26.50 | 27.14 | 40.03 | 43.93 | 57.58 | 64.50 | 68.18 | 70.10 | 61.98 | 47.10 | 36.08 | 18.66 | 46.82 | |||||||||||||
| 1998 | 29.81 | 33.86 | 35.82 | 45.40 | 54.27 | 58.17 | 73.31 | 70.97 | 63.43 | 47.92 | 39.45 | 21.50 | a | 47.83 | ||||||||||||
| 1999 | 30.87 | 30.36 | 41.02 | 43.40 | 52.24 | 62.60 | 70.76 | 69.95 | 58.62 | 49.18 | 40.87 | 25.92 | 47.98 | |||||||||||||
| 2000 | 31.13 | 35.59 | 38.77 | 49.58 | 56.55 | 64.53 | 72.42 | 72.81 | 59.00 | 48.94 | 29.48 | b | 25.56 | 48.70 | ||||||||||||
| 2001 | 14.10 | 24.48 | 38.95 | 45.83 | 57.68 | 63.83 | 72.76 | 71.95 | 63.52 | 49.47 | 38.38 | 17.92 | 46.57 | |||||||||||||
| 2002 | 19.77 | 12.59 | 30.63 | 47.32 | 54.48 | 64.87 | 75.00 | 68.16 | 61.15 | 45.26 | 33.62 | 30.89 | 45.31 | |||||||||||||
| 2003 | 33.95 | 28.12 | 40.48 | 46.98 | 55.29 | 64.73 | 75.56 | 73.35 | 59.78 | 52.18 | 31.73 | 31.16 | 49.45 | |||||||||||||
| 2004 | 13.79 | 20.59 | 40.15 | ----- | z | 54.68 | 64.22 | 71.55 | 67.95 | 58.98 | 48.87 | 34.60 | 27.82 | 45.74 | ||||||||||||
| 2005 | 24.50 | 18.48 | 33.11 | 46.18 | 55.23 | 60.40 | 72.98 | 70.16 | 58.58 | 49.31 | 37.58 | 24.87 | 45.95 | |||||||||||||
| 2006 | 28.26 | 25.27 | 36.97 | a | 48.40 | 57.35 | 67.98 | i | 74.75 | m | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 39.25 | |||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 22.13 | 26.92 | 37.02 | 46.04 | 55.25 | 63.56 | 71.69 | 70.11 | 60.04 | 48.45 | 35.22 | 24.70 | 46.75 | |||||||||||||
| S.D. | 6.39 | 6.39 | 4.64 | 2.82 | 2.94 | 2.58 | 2.28 | 2.48 | 2.86 | 2.67 | 3.40 | 4.80 | 1.62 | |||||||||||||
| SKEW | -0.01 | -0.25 | -1.17 | -0.02 | 0.28 | 0.09 | -1.52 | -0.05 | 0.01 | 0.18 | -0.56 | -0.06 | -0.87 | |||||||||||||
| MAX | 33.95 | 39.56 | 44.84 | 52.18 | 62.44 | 68.93 | 75.56 | 75.35 | 65.73 | 54.95 | 40.92 | 33.45 | 49.45 | |||||||||||||
| MIN | 10.27 | 12.59 | 23.77 | 39.06 | 48.73 | 58.17 | 62.21 | 65.80 | 53.55 | 42.55 | 27.65 | 14.00 | 41.70 | |||||||||||||
| NO YRS | 49 | 49 | 50 | 48 | 50 | 49 | 47 | 49 | 49 | 48 | 49 | 49 | 41 | |||||||||||||