| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 56.00 | 48.48 | 38.68 | 20.17 | 10.04 | f | 40.83 | |||||
| 1949 | 2.14 | f | 13.62 | d | 26.12 | g | 35.11 | b | 44.83 | a | 50.52 | 57.69 | 59.38 | n | 49.38 | 35.46 | f | 31.60 | 16.34 | 37.39 | ||||||
| 1950 | 12.89 | h | 21.84 | l | 24.15 | g | 32.22 | 36.86 | c | 49.00 | c | 55.19 | 56.74 | 47.78 | a | 39.88 | b | 25.75 | b | 22.97 | 40.71 | |||||
| 1951 | 12.84 | 19.07 | 16.81 | o | 37.32 | p | 44.87 | h | 46.05 | 58.10 | a | 55.35 | 46.59 | b | 35.71 | 19.97 | 15.05 | 34.30 | ||||||||
| 1952 | 14.00 | 13.78 | 18.73 | a | 35.75 | 43.95 | a | 51.47 | 56.40 | 56.63 | 50.50 | b | 40.03 | 18.57 | a | 17.00 | 34.73 | |||||||||
| 1953 | 25.72 | m | 17.44 | a | 24.84 | 29.10 | 38.81 | 50.43 | 60.29 | 56.85 | 49.35 | 41.70 | a | 30.47 | 15.95 | 37.75 | ||||||||||
| 1954 | 19.53 | 22.75 | 20.42 | 34.88 | 44.21 | 48.22 | 59.89 | 54.68 | 47.89 | b | 35.56 | 30.00 | 10.71 | 35.73 | ||||||||||||
| 1955 | 8.69 | 11.52 | 14.95 | 30.23 | 41.37 | a | 49.17 | 58.02 | a | 58.42 | 47.88 | 38.03 | 19.98 | 17.74 | 33.00 | |||||||||||
| 1956 | 15.95 | 9.83 | 20.11 | 33.77 | 44.84 | 51.79 | a | 58.47 | 54.90 | 47.92 | 37.29 | 18.33 | 16.53 | 34.14 | ||||||||||||
| 1957 | 5.69 | 22.00 | 23.48 | 33.17 | 43.89 | 50.03 | a | 57.69 | 56.73 | 47.50 | 37.60 | 28.77 | q | ----- | z | 37.78 | ||||||||||
| 1958 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1959 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1960 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1961 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1962 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1963 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1964 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1965 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1966 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1967 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1968 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1969 | 16.68 | 15.50 | 16.87 | 36.33 | 45.73 | 50.35 | 57.34 | 58.23 | 50.28 | 33.89 | 24.60 | 16.85 | 35.22 | |||||||||||||
| 1970 | 16.85 | 18.50 | 21.19 | 27.43 | i | 41.48 | 50.86 | i | 59.16 | 58.90 | 44.13 | 32.19 | 26.03 | 14.16 | 33.26 | |||||||||||
| 1971 | 16.42 | 15.75 | 20.29 | 28.28 | l | 42.68 | 49.97 | 57.79 | 62.18 | 44.10 | 36.40 | 22.85 | 12.05 | 34.59 | ||||||||||||
| 1972 | 13.92 | 18.95 | 28.13 | 32.80 | 42.40 | 52.05 | 56.37 | 58.40 | 44.85 | 37.21 | 23.88 | 9.76 | 34.89 | |||||||||||||
| 1973 | 11.40 | 17.61 | 22.52 | 28.83 | g | 42.66 | 51.03 | 58.23 | 57.40 | ----- | z | 38.40 | 24.81 | f | 18.21 | 35.27 | ||||||||||
| 1974 | 14.23 | 16.44 | c | 23.46 | e | 30.93 | c | 39.40 | k | 53.17 | 60.18 | 54.98 | 46.48 | 39.92 | 22.65 | 11.23 | 33.97 | |||||||||
| 1975 | 10.21 | 13.57 | a | 20.44 | 26.10 | d | 36.24 | 47.77 | 59.65 | 51.42 | 45.40 | 33.85 | a | 17.85 | 18.03 | 31.71 | ||||||||||
| 1976 | 13.76 | 13.91 | 15.63 | 31.80 | c | 42.67 | d | 48.22 | e | 58.06 | 52.27 | g | 47.95 | 35.69 | e | 24.56 | c | 11.60 | 31.26 | |||||||
| 1977 | 9.65 | 16.12 | 18.06 | 34.98 | e | 41.70 | h | 55.38 | 57.53 | 55.16 | 44.32 | b | 36.58 | 24.17 | c | 16.48 | a | 33.49 | ||||||||
| 1978 | 17.39 | 17.71 | 26.08 | 34.17 | 39.67 | b | 50.25 | 57.83 | e | 52.84 | 45.48 | b | 35.93 | b | 22.55 | 2.92 | a | 33.57 | ||||||||
| 1979 | 1.29 | 15.82 | 22.58 | 31.00 | 40.59 | b | 50.62 | f | 58.00 | a | 56.25 | a | 50.08 | 37.02 | h | 16.08 | 16.18 | 30.79 | ||||||||
| 1980 | 12.11 | 20.45 | 21.73 | 32.70 | 43.40 | a | 50.32 | 56.89 | 52.79 | 46.62 | b | 35.47 | 24.78 | 20.39 | 34.80 | |||||||||||
| 1981 | 17.66 | 17.80 | 27.81 | 35.34 | a | 42.11 | 49.37 | 55.87 | 58.26 | 49.68 | 34.42 | 27.38 | 17.35 | 36.09 | ||||||||||||
| 1982 | 9.90 | 11.43 | 23.89 | 26.33 | 38.27 | 49.62 | 56.02 | 57.73 | e | 46.12 | j | 33.87 | 17.53 | a | 14.36 | c | 30.81 | |||||||||
| 1983 | 14.69 | 17.61 | 25.19 | 28.50 | a | 38.52 | 47.22 | 56.15 | 58.76 | 45.48 | 38.00 | 24.02 | 8.81 | 33.58 | ||||||||||||
| 1984 | 11.71 | 13.07 | 23.84 | ----- | z | 40.26 | 47.67 | 57.73 | 57.05 | 43.54 | b | 29.34 | 20.19 | c | 6.60 | 31.91 | ||||||||||
| 1985 | 6.81 | 5.18 | 17.47 | 34.22 | 44.47 | 52.05 | 59.60 | 52.50 | ----- | z | ----- | z | ----- | z | ----- | z | 34.04 | |||||||||
| 1986 | 15.15 | 21.39 | 28.02 | 32.66 | a | 39.85 | 54.77 | 53.60 | a | 55.89 | c | 42.32 | ----- | z | 21.50 | 8.03 | 33.92 | |||||||||
| 1987 | 9.65 | 18.12 | ----- | z | 37.58 | 46.83 | a | 52.25 | 55.06 | 52.52 | 48.33 | 36.24 | 23.92 | 12.68 | 35.74 | |||||||||||
| 1988 | 7.98 | a | 13.67 | 18.60 | 33.78 | 43.44 | 55.83 | 58.00 | a | 53.62 | a | 43.40 | 40.97 | 20.83 | 10.23 | 33.36 | ||||||||||
| 1989 | 10.34 | 11.57 | 25.16 | 32.88 | 41.66 | 50.42 | 59.29 | 53.95 | 45.93 | 36.13 | 22.38 | 11.32 | 33.42 | |||||||||||||
| 1990 | 16.76 | 12.36 | 25.05 | 36.57 | 39.73 | 50.80 | 58.35 | 56.16 | 52.43 | 33.42 | 24.92 | 1.77 | 34.03 | |||||||||||||
| 1991 | 8.15 | 20.80 | 21.18 | 30.27 | 40.23 | 50.82 | 56.69 | 57.79 | 46.85 | 34.13 | 19.22 | 9.03 | 32.93 | |||||||||||||
| 1992 | 9.77 | 21.86 | 31.21 | 36.63 | 47.19 | 51.15 | 52.95 | 54.74 | 44.12 | 38.21 | 18.15 | 10.29 | 34.69 | |||||||||||||
| 1993 | 9.27 | 11.55 | 24.85 | 31.18 | 44.19 | 48.27 | 48.85 | 52.02 | 44.97 | 35.15 | 15.27 | 14.16 | 31.64 | |||||||||||||
| 1994 | 17.10 | 12.46 | 24.77 | 33.87 | 45.08 | 50.95 | 57.29 | 56.82 | 47.95 | 34.47 | 14.40 | 14.98 | 34.18 | |||||||||||||
| 1995 | 10.76 | 22.77 | 22.55 | 30.85 | 39.08 | 47.87 | 54.18 | 53.13 | 45.30 | 31.15 | 27.95 | 15.69 | 33.44 | |||||||||||||
| 1996 | 12.13 | 14.45 | 22.65 | 31.03 | 39.06 | 51.09 | b | 59.15 | 55.52 | 44.27 | 34.95 | 24.95 | 16.98 | 33.85 | ||||||||||||
| 1997 | 12.74 | 11.77 | 21.48 | 27.63 | 41.97 | 53.08 | 55.32 | 56.18 | ----- | z | 35.11 | 24.23 | 8.42 | 31.63 | ||||||||||||
| 1998 | 18.35 | 17.38 | 22.76 | 32.57 | 43.34 | 45.33 | 57.97 | 52.16 | 52.77 | 38.15 | 27.30 | 13.70 | a | 35.15 | ||||||||||||
| 1999 | 17.32 | 15.54 | 24.02 | 30.55 | 38.92 | 48.67 | 55.48 | 57.06 | 44.32 | 37.18 | 31.10 | 15.23 | 34.61 | |||||||||||||
| 2000 | 17.45 | 21.09 | 24.95 | 36.18 | 43.30 | a | 50.00 | 58.23 | 57.15 | 45.50 | 37.05 | 14.96 | f | 11.25 | c | 36.56 | ||||||||||
| 2001 | 10.26 | 15.16 | 26.66 | 31.79 | d | 44.39 | 50.98 | 59.34 | 58.53 | 49.55 | 35.33 | a | 28.86 | e | 12.55 | a | 35.28 | |||||||||
| 2002 | 12.68 | 10.34 | 20.52 | 33.03 | 41.08 | 52.02 | 61.19 | 53.72 | a | 46.90 | 32.74 | 19.95 | 15.48 | 33.30 | ||||||||||||
| 2003 | 21.50 | ----- | z | ----- | z | 35.62 | m | 43.06 | 50.37 | 61.37 | 59.32 | 45.90 | 40.18 | a | 16.88 | 16.34 | c | 39.44 | ||||||||
| 2004 | 12.24 | 16.36 | 29.42 | 36.63 | 41.56 | 50.45 | 56.82 | 53.89 | 45.73 | 37.31 | 23.18 | 18.35 | a | 35.16 | ||||||||||||
| 2005 | 18.16 | 14.21 | 25.98 | d | 32.38 | q | 42.61 | 48.20 | 57.94 | 55.35 | 45.48 | 38.48 | 23.40 | e | 12.98 | 34.80 | ||||||||||
| 2006 | 15.85 | 12.71 | 20.93 | a | 35.20 | e | 43.72 | b | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 25.69 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 13.07 | 15.80 | 22.82 | 32.76 | 42.05 | 50.33 | 57.42 | 55.88 | 46.83 | 36.33 | 22.85 | 13.56 | 34.10 | |||||||||||||
| S.D. | 4.13 | 3.89 | 3.64 | 2.84 | 2.55 | 2.20 | 2.25 | 2.33 | 2.44 | 2.62 | 4.32 | 4.31 | 1.13 | |||||||||||||
| SKEW | -0.37 | -0.12 | -0.04 | -0.48 | -0.22 | 0.27 | -1.25 | 0.09 | 0.48 | -0.24 | 0.12 | -0.60 | -0.43 | |||||||||||||
| MAX | 21.50 | 22.77 | 31.21 | 37.58 | 47.19 | 55.83 | 61.37 | 62.18 | 52.77 | 41.70 | 31.60 | 22.97 | 36.09 | |||||||||||||
| MIN | 1.29 | 5.18 | 14.95 | 26.10 | 36.24 | 45.33 | 48.85 | 51.42 | 42.32 | 29.34 | 14.40 | 1.77 | 31.64 | |||||||||||||
| NO YRS | 44 | 45 | 42 | 40 | 44 | 44 | 46 | 45 | 43 | 43 | 43 | 44 | 25 | |||||||||||||