| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1949 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 50.17 | a | 41.11 | 34.63 | 21.23 | 36.79 | ||||
| 1950 | 25.60 | 19.73 | 34.47 | 37.18 | 42.97 | 50.88 | 54.73 | 57.90 | 48.72 | 39.23 | 24.43 | 24.44 | 38.36 | |||||||||||||
| 1951 | 18.35 | 26.23 | 23.97 | 37.42 | 44.44 | 49.20 | 59.98 | 55.69 | 50.05 | 38.18 | 33.30 | 23.85 | 38.39 | |||||||||||||
| 1952 | 18.87 | 28.84 | 30.94 | 35.35 | 43.44 | 51.62 | 54.79 | 56.68 | 50.50 | 42.20 | c | 36.47 | 28.37 | 39.84 | ||||||||||||
| 1953 | 21.40 | 27.80 | 29.31 | 38.60 | 44.58 | 55.41 | a | 58.16 | 55.95 | 48.63 | 38.08 | 32.00 | 29.58 | 39.96 | ||||||||||||
| 1954 | 24.68 | 18.09 | 31.35 | 36.83 | 45.10 | 51.63 | 56.48 | 55.35 | 51.88 | 41.87 | 34.78 | 18.05 | 38.84 | |||||||||||||
| 1955 | 29.48 | 27.34 | 30.65 | 34.67 | 42.79 | 47.27 | 56.37 | 54.24 | 48.68 | 36.45 | 24.13 | 21.71 | 37.82 | |||||||||||||
| 1956 | 19.50 | 21.22 | 27.35 | 36.22 | 41.44 | 49.07 | 55.81 | 54.92 | 48.17 | 36.81 | 27.10 | 20.76 | 36.53 | |||||||||||||
| 1957 | 24.89 | 28.32 | 35.45 | 40.32 | 47.71 | 55.93 | 57.45 | 59.44 | 50.83 | 43.89 | 37.65 | 20.97 | 41.90 | |||||||||||||
| 1958 | 29.18 | 31.73 | 34.82 | 41.83 | 45.77 | 52.62 | 54.44 | 54.35 | 48.72 | 36.74 | 29.92 | 29.18 | 40.77 | |||||||||||||
| 1959 | 22.97 | 31.59 | 24.34 | 37.53 | 47.39 | 56.13 | 53.87 | 57.63 | 50.00 | 39.92 | 34.05 | 27.05 | 40.21 | |||||||||||||
| 1960 | 26.16 | 34.10 | 29.66 | 36.45 | 47.37 | 53.63 | 56.32 | 55.26 | 48.18 | 41.74 | 32.23 | 34.05 | 41.26 | |||||||||||||
| 1961 | 29.63 | 26.55 | 25.06 | 38.12 | 46.90 | b | 53.28 | 55.39 | 53.98 | 50.10 | 36.55 | 28.08 | 16.85 | 38.38 | ||||||||||||
| 1962 | 26.37 | 30.09 | 28.35 | 40.58 | 44.08 | 51.23 | 56.05 | 56.97 | 48.47 | 41.13 | 32.20 | 27.55 | 40.26 | |||||||||||||
| 1963 | 28.68 | 31.62 | 30.97 | 37.63 | 47.48 | 50.90 | 57.74 | 57.44 | 53.07 | 42.26 | 23.70 | 34.29 | 41.31 | |||||||||||||
| 1964 | 28.36 | i | 26.62 | 26.87 | 37.12 | 44.16 | 53.15 | 55.98 | 55.13 | 50.90 | 40.97 | 31.23 | 17.19 | 39.94 | ||||||||||||
| 1965 | 23.03 | 22.30 | 36.92 | 41.40 | 42.29 | 47.40 | 54.24 | 55.13 | 51.80 | 37.10 | 30.87 | 23.45 | 38.83 | |||||||||||||
| 1966 | 24.60 | 25.79 | 23.90 | 39.03 | 43.73 | 52.50 | 56.35 | 53.50 | 49.78 | 35.90 | 30.70 | 25.53 | 38.44 | |||||||||||||
| 1967 | 22.98 | 25.52 | 31.95 | 39.53 | 47.81 | 52.95 | 57.69 | 55.76 | 48.93 | 40.97 | 33.77 | 24.03 | 40.16 | |||||||||||||
| 1968 | 21.81 | 28.86 | 33.52 | 37.07 | 48.00 | 53.80 | 58.32 | 59.06 | 50.10 | 38.47 | 32.95 | 19.87 | 40.15 | |||||||||||||
| 1969 | 16.63 | 26.59 | 32.68 | 39.78 | 45.87 | 52.88 | 56.89 | 54.65 | 50.30 | 43.00 | 31.00 | 35.24 | 40.46 | |||||||||||||
| 1970 | 19.18 | 34.71 | 36.85 | 36.35 | 46.10 | 50.53 | a | 54.18 | 53.02 | 48.07 | 36.47 | 34.12 | 23.28 | a | 39.40 | |||||||||||
| 1971 | 13.60 | e | 26.86 | 22.63 | 35.37 | 39.97 | 48.47 | 54.03 | 55.56 | 48.69 | a | 37.74 | b | 28.24 | a | 27.83 | z | 37.38 | ||||||||
| 1972 | 18.72 | d | 23.29 | a | 21.87 | 31.23 | 42.79 | 47.88 | 59.16 | 55.23 | 47.58 | 38.92 | 31.70 | 23.77 | 36.85 | |||||||||||
| 1973 | 14.19 | 23.79 | 30.76 | 37.98 | 43.03 | 50.00 | 53.68 | 53.65 | 46.92 | 38.19 | 26.65 | 28.05 | 37.24 | |||||||||||||
| 1974 | 19.32 | 23.36 | 28.02 | 38.60 | 46.52 | 52.45 | 55.76 | 58.29 | 50.48 | 39.85 | 32.48 | 26.55 | 39.31 | |||||||||||||
| 1975 | 21.98 | 21.21 | 28.55 | 35.60 | 43.35 | 49.27 | 56.37 | a | 54.02 | g | 48.90 | 39.16 | 25.20 | 23.02 | 35.69 | |||||||||||
| 1976 | 26.18 | 23.31 | 30.23 | 37.05 | 43.84 | 51.95 | 55.29 | 54.42 | 46.87 | 37.40 | 37.08 | 32.19 | 39.65 | |||||||||||||
| 1977 | 37.42 | 36.04 | 29.73 | 35.63 | 44.19 | 52.73 | 57.40 | 55.53 | 49.35 | 39.87 | 23.72 | 21.11 | 40.23 | |||||||||||||
| 1978 | 30.92 | 32.41 | 33.97 | 38.97 | 45.24 | 50.00 | 53.37 | 56.90 | 49.23 | 39.90 | 32.05 | 28.79 | 40.98 | |||||||||||||
| 1979 | 29.56 | 15.93 | 35.03 | 39.47 | 45.06 | 51.38 | ----- | z | 55.97 | 51.70 | 42.81 | 37.13 | 19.35 | 38.49 | ||||||||||||
| 1980 | 22.92 | 32.60 | 32.25 | a | 38.98 | 43.21 | 51.38 | 55.48 | 53.73 | 48.98 | 40.97 | a | 33.74 | a | 13.87 | 39.01 | ||||||||||
| 1981 | 37.06 | 30.09 | 36.23 | 38.78 | a | 48.45 | 52.42 | 54.42 | 53.58 | a | 48.18 | 39.90 | 29.42 | 26.87 | 41.28 | |||||||||||
| 1982 | 21.40 | 22.30 | a | 32.06 | 35.53 | 43.27 | a | 50.23 | 54.83 | a | 55.23 | 48.75 | 34.77 | 32.38 | 32.08 | 38.57 | ||||||||||
| 1983 | 26.37 | 31.20 | 36.56 | 39.68 | 46.26 | 53.23 | 57.44 | 55.63 | 47.77 | 39.89 | 35.18 | 28.92 | 41.51 | |||||||||||||
| 1984 | 28.18 | 26.48 | 37.65 | 38.07 | 46.21 | 53.62 | 56.52 | 56.87 | 49.95 | 39.79 | 29.73 | 31.35 | 41.20 | |||||||||||||
| 1985 | 36.92 | 23.34 | 31.98 | 31.92 | 44.21 | 50.08 | 55.44 | 54.34 | 50.00 | 35.16 | 26.28 | 35.37 | 39.59 | |||||||||||||
| 1986 | 33.73 | 28.00 | 30.35 | 35.03 | 46.53 | 51.26 | a | 56.15 | 52.66 | 50.97 | 42.79 | 33.62 | 34.92 | 41.33 | ||||||||||||
| 1987 | 32.80 | a | 34.43 | 33.38 | a | 40.22 | 46.53 | 49.88 | 56.55 | 56.63 | 49.88 | 41.74 | 34.28 | 27.57 | a | 41.99 | ||||||||||
| 1988 | 30.06 | 32.88 | 36.13 | 38.68 | 46.05 | 52.45 | 55.95 | 54.58 | 48.35 | 40.29 | 31.59 | a | 28.85 | 41.32 | ||||||||||||
| 1989 | 15.53 | 26.96 | 32.11 | 40.30 | 47.21 | 51.42 | 57.90 | 56.13 | 50.79 | a | 39.40 | 27.84 | a | 33.42 | 39.92 | |||||||||||
| 1990 | 23.85 | 17.88 | 35.00 | a | 42.20 | 46.58 | 54.15 | 55.55 | 57.50 | 50.43 | a | 38.53 | 24.29 | a | 27.82 | 39.48 | ||||||||||
| 1991 | ----- | z | 28.70 | a | 32.28 | a | 37.90 | 43.40 | 50.37 | 53.66 | 54.29 | 49.33 | 39.66 | 34.67 | 28.73 | 41.18 | ||||||||||
| 1992 | 30.39 | 24.12 | 29.76 | 39.23 | 46.44 | 51.47 | 55.35 | 52.77 | 44.59 | a | 36.44 | 33.77 | 26.47 | 39.23 | ||||||||||||
| 1993 | 25.10 | 30.18 | 35.05 | 41.47 | 48.27 | c | 52.97 | a | 59.27 | 57.57 | d | 49.62 | b | 42.95 | 33.80 | 33.23 | 42.46 | |||||||||
| 1994 | 30.73 | a | 22.98 | c | 29.61 | 39.62 | 44.27 | 53.31 | a | 55.15 | 58.31 | 49.02 | 38.24 | 26.48 | a | 27.00 | a | 39.56 | ||||||||
| 1995 | 27.50 | 27.20 | 25.82 | a | 41.68 | 44.76 | 51.85 | 55.26 | b | 56.35 | 51.65 | 41.82 | 29.37 | 29.89 | 40.26 | |||||||||||
| 1996 | 19.73 | 25.00 | 35.53 | 39.12 | 49.65 | 53.82 | 56.00 | c | 55.77 | 48.13 | 34.92 | 30.22 | 25.58 | 39.46 | ||||||||||||
| 1997 | 26.35 | 35.57 | 31.16 | ----- | z | 49.43 | a | 55.90 | a | ----- | z | ----- | z | 53.15 | d | 41.18 | l | ----- | z | ----- | z | 41.93 | ||||
| 1998 | 28.87 | ----- | z | 35.52 | 39.52 | a | 43.65 | 52.25 | ----- | z | 53.03 | ----- | z | 40.56 | ----- | z | 25.43 | a | 39.85 | |||||||
| 1999 | 21.50 | a | 18.33 | a | 29.50 | 37.05 | 45.65 | 52.14 | a | 58.93 | c | ----- | z | ----- | z | ----- | z | 30.53 | a | 25.21 | 35.43 | |||||
| 2000 | 21.93 | b | 33.11 | a | 35.08 | 40.25 | 47.34 | 50.52 | 54.37 | a | 56.87 | a | 50.16 | b | 40.02 | 36.74 | a | 34.70 | a | 41.76 | ||||||
| 2001 | 34.60 | b | 32.62 | b | 34.00 | a | 38.95 | a | 44.74 | 56.16 | b | 55.40 | a | 57.06 | 49.55 | b | 35.48 | 30.33 | 21.58 | a | 40.87 | |||||
| 2002 | 29.81 | e | 29.45 | 29.29 | 35.37 | 47.69 | 51.22 | 56.11 | 55.63 | 49.82 | 44.40 | 40.00 | 32.09 | c | 41.74 | |||||||||||
| 2003 | 31.84 | 35.34 | ----- | z | 41.18 | b | 46.64 | b | 49.25 | r | 58.83 | b | ----- | z | 50.02 | i | 42.61 | d | 28.64 | a | 28.35 | d | 39.18 | |||
| 2004 | 21.13 | 33.88 | a | 29.82 | a | 38.77 | f | 50.64 | b | 54.12 | f | 58.11 | d | 60.87 | a | 48.33 | a | 41.97 | a | ----- | z | 29.02 | g | 43.09 | ||
| 2005 | 29.87 | a | 29.16 | ----- | z | ----- | z | ----- | z | 55.11 | c | 58.16 | c | ----- | z | ----- | z | ----- | z | ----- | z | 37.46 | r | 43.07 | ||
| 2006 | 20.37 | d | 28.73 | 30.02 | 37.42 | d | 47.96 | c | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 32.90 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 25.35 | 27.51 | 31.21 | 38.09 | 45.51 | 51.91 | 56.17 | 55.75 | 49.49 | 39.54 | 31.25 | 26.58 | 39.91 | |||||||||||||
| S.D. | 5.75 | 4.95 | 3.89 | 2.32 | 2.17 | 2.14 | 1.62 | 1.79 | 1.54 | 2.46 | 3.92 | 5.23 | 1.41 | |||||||||||||
| SKEW | 0.12 | -0.28 | -0.48 | -0.61 | -0.01 | -0.02 | 0.33 | 0.48 | -0.16 | -0.14 | -0.21 | -0.21 | -0.37 | |||||||||||||
| MAX | 37.42 | 36.04 | 37.65 | 42.20 | 50.64 | 56.16 | 59.98 | 60.87 | 53.15 | 44.40 | 40.00 | 35.37 | 42.46 | |||||||||||||
| MIN | 13.60 | 15.93 | 21.87 | 31.23 | 39.97 | 47.27 | 53.37 | 52.66 | 44.59 | 34.77 | 23.70 | 13.87 | 36.53 | |||||||||||||
| NO YRS | 55 | 56 | 55 | 54 | 56 | 54 | 53 | 51 | 53 | 54 | 53 | 53 | 45 | |||||||||||||