| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 73.41 | o | 71.58 | 64.21 | b | 50.52 | 34.18 | 26.84 | 49.47 | |||||
| 1949 | 11.61 | 21.77 | 37.56 | 50.97 | a | 55.94 | 64.50 | 72.84 | 70.82 | 65.07 | 47.47 | 45.18 | 27.00 | 47.56 | ||||||||||||
| 1950 | 26.61 | 36.45 | 40.19 | 49.50 | 54.11 | 64.57 | 71.94 | 71.10 | 62.05 | 57.13 | 42.90 | 35.24 | 50.98 | |||||||||||||
| 1951 | 28.05 | a | 33.48 | 37.23 | 47.67 | 55.87 | 64.73 | 74.81 | 70.05 | 64.92 | 49.47 | 35.93 | 24.65 | 48.90 | ||||||||||||
| 1952 | 27.15 | 31.48 | 33.37 | 48.17 | 58.05 | 64.87 | 72.16 | 73.66 | 64.82 | 57.15 | 33.12 | 30.45 | 49.54 | |||||||||||||
| 1953 | 38.15 | 32.52 | 40.42 | 45.88 | 49.56 | 65.65 | 74.95 | 70.61 | 66.25 | 50.19 | 42.31 | a | 26.84 | 50.28 | ||||||||||||
| 1954 | 32.23 | 36.61 | 36.82 | 51.65 | 59.73 | 64.68 | 74.37 | 70.34 | 63.90 | 52.56 | 41.27 | 30.06 | 51.19 | |||||||||||||
| 1955 | 22.97 | 23.09 | 37.73 | 44.52 | 54.74 | 64.23 | 71.79 | 71.81 | 64.38 | 53.61 | 38.73 | 36.98 | 48.72 | |||||||||||||
| 1956 | 37.19 | 27.41 | 40.11 | 46.90 | 58.03 | 68.50 | 72.71 | 70.00 | 67.10 | 51.21 | 33.20 | 29.94 | 50.19 | |||||||||||||
| 1957 | 27.13 | 38.34 | 40.71 | 45.38 | 52.11 | 66.73 | 73.10 | a | 71.50 | 62.80 | 49.27 | 32.63 | 34.98 | 49.56 | ||||||||||||
| 1958 | 29.40 | 38.98 | 35.65 | 44.67 | 60.71 | 68.12 | 72.74 | 75.29 | 63.43 | 53.66 | 38.53 | 38.21 | 51.62 | |||||||||||||
| 1959 | 33.03 | 31.21 | 40.31 | 50.47 | 55.55 | 70.05 | 75.92 | 72.02 | 61.13 | 51.69 | 39.35 | 31.76 | 51.04 | |||||||||||||
| 1960 | 25.63 | 30.97 | 43.78 | a | 49.22 | 57.69 | 70.23 | 76.29 | 72.68 | 66.98 | 50.89 | 40.97 | 28.58 | 51.16 | ||||||||||||
| 1961 | 32.00 | 37.14 | 37.87 | 47.95 | 56.82 | 70.30 | 75.06 | 71.45 | 58.13 | 49.68 | 35.12 | 28.44 | 50.00 | |||||||||||||
| 1962 | 24.19 | 34.27 | 34.56 | 51.98 | 53.98 | 65.02 | 71.15 | 72.71 | 65.63 | 53.27 | 43.47 | 31.31 | 50.13 | |||||||||||||
| 1963 | 24.66 | 39.09 | 38.40 | 43.98 | 60.40 | 63.13 | 74.66 | 71.61 | 65.83 | 56.42 | 40.20 | 29.23 | 50.64 | |||||||||||||
| 1964 | 26.89 | 27.53 | 33.40 | 44.25 | 54.52 | 64.13 | 75.68 | 71.06 | 61.70 | 56.08 | 34.03 | 33.02 | 48.52 | |||||||||||||
| 1965 | 32.98 | 30.20 | 37.35 | 47.17 | 52.82 | 61.45 | 71.19 | 69.97 | 57.20 | 54.44 | 42.98 | 32.08 | 49.15 | |||||||||||||
| 1966 | 28.06 | 28.77 | 41.55 | 48.10 | 59.68 | 66.57 | 74.97 | 73.48 | 65.37 | 51.52 | 43.58 | 29.00 | 50.89 | |||||||||||||
| 1967 | 27.05 | 36.41 | 44.40 | 42.45 | 54.27 | 61.65 | 73.53 | 72.56 | 62.47 | 53.10 | 43.37 | 20.97 | 49.35 | |||||||||||||
| 1968 | 26.95 | 40.24 | 42.00 | 43.65 | 55.02 | 66.67 | 71.50 | 66.03 | 60.20 | 50.21 | 38.07 | 27.10 | 48.97 | |||||||||||||
| 1969 | 35.76 | 33.00 | 34.82 | 48.25 | 59.71 | 62.30 | 72.40 | 74.74 | 64.93 | 45.08 | 38.07 | 33.52 | 50.22 | |||||||||||||
| 1970 | 32.58 | 38.96 | 37.19 | 42.47 | 57.32 | 66.42 | 73.26 | 73.13 | 59.75 | 47.85 | 41.93 | 32.95 | 50.32 | |||||||||||||
| 1971 | 32.60 | 31.25 | 39.82 | 47.05 | 51.87 | 65.55 | 74.19 | 71.52 | 60.20 | 47.66 | 37.40 | 27.37 | 48.87 | |||||||||||||
| 1972 | 33.48 | 39.86 | 47.26 | 49.97 | 58.66 | 67.33 | 75.45 | 69.21 | 60.53 | 48.76 | 34.30 | 23.56 | 50.70 | |||||||||||||
| 1973 | 20.34 | 33.66 | 35.31 | 42.53 | 55.44 | 64.02 | 72.97 | 72.60 | 60.33 | 51.00 | 38.13 | 32.47 | 48.23 | |||||||||||||
| 1974 | 24.71 | 31.23 | 44.82 | 45.33 | 60.18 | 70.28 | 73.66 | 72.85 | 66.20 | 53.56 | 42.28 | 30.44 | 51.30 | |||||||||||||
| 1975 | 29.50 | 33.91 | 38.76 | 42.22 | 53.60 | 65.43 | 75.18 | 72.47 | 65.58 | 52.44 | 39.70 | 34.50 | 50.27 | |||||||||||||
| 1976 | 33.66 | 39.14 | 38.87 | 48.87 | 62.16 | 67.90 | 77.11 | 72.58 | 66.05 | 52.26 | 43.78 | 34.98 | 53.11 | |||||||||||||
| 1977 | 31.15 | 37.86 | 36.89 | 51.75 | 54.06 | 70.58 | 74.31 | 73.19 | 64.57 | 54.85 | 42.80 | 39.27 | 52.61 | |||||||||||||
| 1978 | 34.81 | 38.21 | 46.37 | 48.30 | 53.97 | 67.58 | 74.31 | 71.90 | 61.40 | 55.19 | 37.73 | 27.06 | 51.40 | |||||||||||||
| 1979 | 24.06 | 30.71 | 40.76 | 49.03 | 57.21 | 67.10 | 75.29 | 70.85 | 68.87 | 56.13 | 36.95 | 34.81 | 50.98 | |||||||||||||
| 1980 | 35.42 | 39.88 | 37.42 | 48.83 | 53.53 | 66.92 | 75.65 | 72.35 | 64.10 | 51.21 | 41.98 | 39.06 | 52.20 | |||||||||||||
| 1981 | 33.95 | 37.88 | 40.50 | 52.12 | 56.95 | 71.27 | 78.32 | 74.21 | 66.20 | 49.45 | 44.30 | 38.81 | 53.66 | |||||||||||||
| 1982 | 27.81 | 33.77 | 41.76 | 47.27 | 56.42 | 64.97 | 72.05 | 73.82 | 62.82 | 48.77 | 39.45 | 29.24 | 49.84 | |||||||||||||
| 1983 | 36.31 | 40.16 | 42.94 | 44.12 | 54.06 | 65.38 | 73.15 | 72.05 | 66.53 | 52.53 | 40.23 | 34.89 | 51.86 | |||||||||||||
| 1984 | 28.30 | a | 31.93 | 39.84 | 44.40 | 62.47 | 66.13 | 74.23 | 72.69 | 64.93 | 45.89 | 40.42 | 29.73 | 50.08 | ||||||||||||
| 1985 | 29.29 | 31.11 | 39.77 | 52.15 | 59.29 | 69.63 | 75.21 | 73.08 | 58.75 | 49.92 | 36.43 | 28.87 | 50.29 | |||||||||||||
| 1986 | 37.24 | 37.32 | 45.16 | 47.37 | 56.95 | 69.90 | 71.69 | 72.87 | 57.70 | 47.89 | 39.07 | 32.10 | 51.27 | |||||||||||||
| 1987 | 26.08 | 34.23 | 37.26 | 51.80 | 56.44 | 68.62 | 70.98 | 71.24 | 64.45 | 54.81 | 37.68 | 26.45 | 50.00 | |||||||||||||
| 1988 | 25.40 | 33.78 | 38.29 | 47.85 | 54.18 | 69.35 | 75.60 | 71.77 | 61.07 | 57.56 | 38.90 | 26.87 | 50.05 | |||||||||||||
| 1989 | 20.77 | 27.88 | 45.74 | 53.93 | 57.76 | 65.90 | 76.02 | 70.84 | 64.02 | 50.81 | 40.18 | 31.53 | 50.45 | |||||||||||||
| 1990 | 30.42 | 28.52 | 43.47 | 51.10 | 56.00 | 69.12 | 74.94 | 71.00 | 65.77 | 52.19 | 38.93 | 20.81 | 50.19 | |||||||||||||
| 1991 | 25.27 | 38.18 | 37.29 | 45.02 | 52.90 | 65.28 | 73.94 | 72.85 | 64.20 | 52.32 | 37.12 | 31.06 | 49.62 | |||||||||||||
| 1992 | 29.47 | 38.78 | 43.08 | 53.93 | 59.06 | 65.65 | 71.35 | 71.92 | 64.38 | 55.05 | 35.05 | 25.79 | 51.13 | |||||||||||||
| 1993 | 31.60 | 32.84 | 43.65 | 47.52 | 58.82 | 62.90 | 70.94 | 71.21 | 63.03 | 50.48 | 36.35 | 30.13 | 49.96 | |||||||||||||
| 1994 | 35.18 | 32.62 | 44.97 | 49.13 | 58.81 | 72.88 | 76.16 | 75.13 | 66.22 | 50.06 | 30.92 | 32.44 | 52.04 | |||||||||||||
| 1995 | 33.89 | 43.64 | 42.35 | 45.57 | 51.98 | 60.77 | 72.53 | 74.65 | 66.40 | 52.55 | 45.53 | 35.76 | 52.13 | |||||||||||||
| 1996 | 34.00 | 39.69 | 42.77 | 49.07 | 60.26 | 71.30 | 77.06 | 74.61 | 62.72 | 49.60 | 40.80 | 34.53 | 53.03 | |||||||||||||
| 1997 | 30.65 | 32.68 | 45.42 | 45.13 | 60.81 | 67.15 | 72.24 | 73.84 | 64.95 | 51.19 | 42.17 | 29.35 | 51.30 | |||||||||||||
| 1998 | 35.69 | 34.50 | 40.53 | 44.47 | 54.40 | 60.35 | 72.74 | 72.34 | 62.22 | 47.37 | 38.20 | 27.05 | 49.16 | |||||||||||||
| 1999 | 34.26 | 34.77 | 42.45 | 41.17 | 53.63 | 65.07 | 71.69 | 69.55 | 61.18 | 51.73 | 43.68 | 28.89 | 49.84 | |||||||||||||
| 2000 | 33.26 | 36.67 | 40.06 | 51.30 | 60.42 | 67.35 | 73.29 | 72.10 | 63.67 | 49.27 | 27.60 | 33.27 | 50.69 | |||||||||||||
| 2001 | 26.81 | 33.25 | 42.31 | 47.47 | 59.60 | 67.07 | 72.84 | 72.23 | 64.75 | 53.06 | 39.42 | 25.89 | 50.39 | |||||||||||||
| 2002 | 28.34 | 32.64 | 36.77 | 50.57 | 55.60 | 68.27 | 75.98 | 70.85 | 61.68 | 47.15 | 36.58 | 29.71 | 49.51 | |||||||||||||
| 2003 | 37.71 | 31.50 | 40.79 | 46.08 | 57.90 | 66.28 | 76.58 | 73.11 | 63.30 | 55.58 | 36.50 | 31.82 | 51.43 | |||||||||||||
| 2004 | 25.98 | 29.17 | 46.84 | 48.43 | 58.73 | 67.75 | 72.50 | 69.95 | 61.02 | 49.27 | 35.12 | 31.40 | 49.68 | |||||||||||||
| 2005 | 35.55 | 35.39 | 39.23 | 45.50 | 55.71 | 63.13 | 73.61 | 68.95 | 61.05 | 50.90 | 39.95 | 31.65 | 50.05 | |||||||||||||
| 2006 | 31.58 | 32.91 | 35.56 | 48.30 | 58.76 | 69.12 | 74.45 | k | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 46.04 | |||||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 29.91 | 34.13 | 40.18 | 47.58 | 56.64 | 66.51 | 73.87 | 71.98 | 63.43 | 51.57 | 38.88 | 30.70 | 50.46 | |||||||||||||
| S.D. | 5.07 | 4.38 | 3.48 | 3.10 | 2.88 | 2.79 | 1.80 | 1.67 | 2.57 | 2.93 | 3.75 | 4.13 | 1.23 | |||||||||||||
| SKEW | -0.78 | -0.41 | 0.10 | 0.02 | -0.07 | -0.05 | 0.21 | -0.59 | -0.47 | 0.11 | -0.50 | -0.03 | 0.29 | |||||||||||||
| MAX | 38.15 | 43.64 | 47.26 | 53.93 | 62.47 | 72.88 | 78.32 | 75.29 | 68.87 | 57.56 | 45.53 | 39.27 | 53.66 | |||||||||||||
| MIN | 11.61 | 21.77 | 33.37 | 41.17 | 49.56 | 60.35 | 70.94 | 66.03 | 57.20 | 45.08 | 27.60 | 20.81 | 47.56 | |||||||||||||
| NO YRS | 58 | 58 | 58 | 58 | 58 | 58 | 57 | 58 | 58 | 58 | 58 | 58 | 57 | |||||||||||||