| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1955 | ----- | z | 20.68 | k | 30.06 | n | 36.44 | l | 44.02 | j | 53.07 | g | 59.40 | e | 62.42 | e | 52.08 | 43.62 | a | 31.12 | f | 26.61 | c | 48.83 | ||
| 1956 | 28.58 | 20.24 | d | 29.61 | h | 42.98 | h | 49.12 | j | 54.38 | b | 62.20 | c | 58.50 | o | 53.68 | e | 45.03 | n | 28.10 | i | 26.40 | b | 40.91 | ||
| 1957 | 17.18 | 29.76 | e | 33.19 | b | 38.72 | l | 46.87 | h | 55.34 | e | 60.79 | 59.61 | 53.54 | f | 41.52 | g | 26.96 | g | 27.26 | h | 42.65 | ||||
| 1958 | 21.47 | 30.55 | 26.89 | 40.05 | 59.03 | 58.67 | 61.31 | 63.53 | 52.87 | 40.58 | 32.72 | 29.90 | 43.13 | |||||||||||||
| 1959 | 27.76 | 25.88 | 33.90 | 47.10 | 44.68 | 58.62 | 64.82 | 60.83 | b | 49.67 | 41.08 | 31.82 | 21.08 | 42.27 | ||||||||||||
| 1960 | 19.47 | 20.28 | 33.66 | 42.18 | 46.35 | 61.07 | 65.69 | 58.23 | 51.78 | g | 44.46 | e | 30.60 | 23.34 | 40.48 | |||||||||||
| 1961 | 25.69 | g | 32.98 | 32.87 | 41.43 | 49.53 | 59.98 | 65.26 | 63.58 | ----- | z | 38.45 | 27.33 | f | 22.43 | a | 45.17 | |||||||||
| 1962 | 18.27 | 28.80 | 26.40 | 41.58 | 46.16 | b | 53.17 | a | 58.45 | ----- | z | 53.70 | h | 45.71 | s | 29.88 | q | 25.82 | 37.33 | |||||||
| 1963 | 18.73 | c | 33.31 | b | 29.02 | d | 31.64 | i | 47.33 | h | 50.21 | f | 58.16 | l | 61.27 | c | 56.47 | j | 46.91 | h | 31.97 | l | 26.39 | l | 35.58 | |
| 1964 | 20.20 | c | 19.00 | a | 24.15 | d | 39.71 | r | 46.96 | c | 51.98 | 62.63 | 58.79 | 47.52 | d | 44.52 | b | 28.90 | e | 26.29 | 39.18 | |||||
| 1965 | 26.50 | 27.48 | a | 27.88 | b | 40.30 | c | 42.86 | b | 52.43 | 61.13 | e | 58.38 | c | 46.94 | m | 44.84 | 36.76 | c | 23.71 | 40.21 | |||||
| 1966 | 22.35 | 20.38 | b | 31.92 | 37.88 | 50.60 | 54.28 | a | 62.37 | 60.85 | 55.27 | 41.21 | 35.57 | 22.38 | a | 41.26 | ||||||||||
| 1967 | 28.52 | 29.84 | 34.29 | 35.18 | 46.85 | 52.68 | 64.29 | 64.29 | 57.12 | e | 44.71 | 36.58 | 21.73 | c | 43.01 | |||||||||||
| 1968 | ----- | z | 34.84 | a | 35.14 | b | 35.93 | 46.05 | 55.48 | f | ----- | z | 56.65 | 51.80 | 43.08 | e | 32.62 | j | 24.48 | b | 41.00 | |||||
| 1969 | 27.27 | 22.52 | e | 25.27 | a | 41.25 | d | 52.77 | c | 55.89 | h | 62.68 | a | 62.41 | b | 54.93 | 38.13 | 32.04 | d | 26.33 | a | 40.51 | ||||
| 1970 | 26.94 | 32.31 | a | 31.74 | 33.65 | 47.83 | a | 55.68 | 63.13 | 63.37 | 46.78 | c | 38.77 | a | 34.95 | b | 23.79 | 41.58 | ||||||||
| 1971 | 28.02 | a | 28.50 | 30.06 | 38.97 | 46.94 | 54.04 | b | 62.52 | 65.02 | b | 48.55 | a | 39.16 | 31.02 | h | 19.10 | a | 41.90 | |||||||
| 1972 | 21.34 | b | 28.88 | 37.73 | 38.13 | 48.45 | 57.63 | 61.23 | 61.94 | 49.50 | b | 42.68 | 30.32 | 20.76 | 41.55 | |||||||||||
| 1973 | 20.87 | 27.45 | 31.45 | 38.71 | a | ----- | z | ----- | z | 62.67 | a | ----- | z | 52.03 | a | 42.75 | g | 35.52 | f | ----- | z | 38.86 | ||||
| 1974 | 23.14 | c | 25.42 | b | 35.60 | b | 39.78 | 47.58 | 59.75 | 63.73 | 59.19 | 53.17 | 44.23 | 35.09 | h | 23.42 | e | 43.18 | ||||||||
| 1975 | 21.07 | h | 25.07 | 30.75 | a | 32.89 | b | 43.93 | h | 53.00 | 64.63 | a | 58.29 | 52.52 | 44.22 | b | 30.23 | b | 30.72 | b | 42.23 | |||||
| 1976 | 24.35 | 30.61 | a | 26.84 | c | 39.48 | 51.40 | 54.95 | 64.18 | ----- | z | 54.07 | 41.76 | ----- | z | 25.68 | 41.33 | |||||||||
| 1977 | 20.42 | a | 30.24 | c | 28.87 | 42.50 | 43.57 | d | 60.16 | a | 61.18 | 61.85 | 52.38 | 44.45 | 34.54 | e | 32.46 | d | 42.72 | |||||||
| 1978 | 29.29 | g | 30.97 | l | ----- | z | 40.27 | o | 42.90 | k | 54.78 | g | 61.73 | 59.15 | e | 51.35 | 43.74 | 31.28 | 21.67 | a | 44.82 | |||||
| 1979 | 17.60 | a | 27.85 | a | 33.16 | 39.20 | c | 47.31 | 55.72 | 62.52 | 61.08 | 55.42 | 46.11 | 27.90 | 28.16 | 41.84 | ||||||||||
| 1980 | 26.50 | a | 33.69 | 31.33 | e | 38.94 | m | 47.42 | 53.00 | a | 63.38 | a | 59.05 | c | 54.07 | 44.22 | b | 33.32 | b | 30.07 | c | 43.28 | ||||
| 1981 | 31.71 | 29.95 | 34.53 | 42.40 | 45.29 | 56.30 | 61.05 | 62.34 | 54.64 | a | 39.12 | g | 36.95 | 30.62 | g | 45.52 | ||||||||||
| 1982 | 20.27 | 20.71 | k | 32.35 | 34.97 | 45.16 | 53.52 | 60.13 | 61.21 | 52.22 | 40.76 | 28.70 | 25.40 | 41.34 | ||||||||||||
| 1983 | 30.58 | 29.43 | 36.13 | 35.57 | 45.05 | 53.15 | 58.73 | 63.24 | 54.07 | 44.84 | 34.67 | a | 24.67 | b | 42.51 | |||||||||||
| 1984 | 21.02 | 23.81 | 31.55 | 36.67 | 48.47 | 53.02 | 63.35 | 63.50 | a | 53.53 | 38.48 | a | 33.97 | 18.48 | 40.49 | |||||||||||
| 1985 | 15.97 | 19.93 | a | 26.90 | 43.58 | 49.24 | 57.12 | 65.44 | 58.11 | 48.03 | 41.33 | a | 28.84 | a | 18.66 | 39.43 | ||||||||||
| 1986 | 30.03 | 33.23 | 39.92 | 41.20 | 48.08 | 58.97 | 59.69 | 64.03 | 47.60 | 42.69 | 34.88 | 26.15 | 43.87 | |||||||||||||
| 1987 | 19.98 | 28.00 | 34.45 | 45.00 | 51.31 | 56.48 | 59.32 | 59.23 | 53.23 | 45.76 | 32.80 | 24.87 | 42.54 | |||||||||||||
| 1988 | 22.85 | 26.59 | 33.24 | 42.88 | 46.92 | 58.38 | 62.79 | 60.35 | 50.85 | 48.48 | 31.03 | 23.40 | 42.32 | |||||||||||||
| 1989 | 17.82 | a | 23.69 | a | 36.98 | 44.28 | 46.34 | 55.53 | 64.19 | 58.97 | 51.90 | 41.79 | 32.67 | 26.47 | 41.72 | |||||||||||
| 1990 | 26.15 | 22.73 | 36.37 | 45.02 | 45.02 | 54.41 | a | 62.77 | 61.39 | 56.07 | 43.79 | 33.72 | 16.19 | 41.97 | ||||||||||||
| 1991 | 21.34 | 34.18 | 33.08 | 38.28 | 44.47 | 52.73 | 63.34 | 62.39 | 53.30 | 42.55 | 33.75 | 26.02 | 42.12 | |||||||||||||
| 1992 | 26.68 | 33.38 | 38.31 | 44.12 | 52.29 | 54.62 | 58.85 | 61.84 | 51.85 | 46.11 | i | 27.28 | 24.97 | o | 44.92 | |||||||||||
| 1993 | 18.38 | a | 21.93 | 39.32 | 39.39 | b | 52.70 | c | 53.18 | 57.94 | ----- | z | 51.43 | h | 43.50 | 24.47 | a | 25.21 | 37.60 | |||||||
| 1994 | 27.55 | 20.70 | 36.85 | 42.80 | 50.89 | 55.60 | 63.60 | 63.90 | 56.63 | 45.43 | a | 30.30 | c | 24.42 | a | 43.22 | ||||||||||
| 1995 | 31.94 | 38.96 | 37.35 | 43.43 | a | 48.40 | 54.07 | c | 60.90 | 60.50 | 53.75 | 41.62 | b | 38.55 | i | 32.19 | m | 47.09 | ||||||||
| 1996 | 28.55 | b | 29.61 | a | 36.53 | 41.75 | 46.54 | c | 56.63 | 63.02 | b | 60.92 | 50.21 | m | 42.00 | 36.55 | b | 28.12 | o | 44.21 | ||||||
| 1997 | 24.30 | p | 26.50 | o | 36.24 | l | 41.11 | h | 50.29 | s | 55.89 | l | 60.95 | j | 60.95 | k | 55.38 | j | 45.19 | m | 37.04 | p | 25.76 | l | 9999.00 | |
| 1998 | 29.79 | q | ----- | z | 32.28 | k | 38.75 | j | 43.65 | n | 50.50 | i | 64.60 | j | 61.97 | o | 55.79 | i | 39.97 | n | 29.54 | q | 26.42 | k | 9999.00 | |
| 1999 | 25.53 | m | 21.19 | o | 31.48 | i | 36.34 | k | 47.36 | q | 53.14 | l | 60.88 | g | 61.43 | p | ----- | z | 45.35 | u | 38.50 | w | ----- | z | 9999.00 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 23.68 | 27.74 | 32.72 | 40.22 | 47.96 | 55.56 | 62.18 | 61.13 | 52.42 | 42.77 | 32.27 | 24.47 | 42.08 | |||||||||||||
| S.D. | 4.57 | 4.94 | 4.02 | 3.45 | 3.21 | 2.54 | 2.02 | 2.10 | 2.64 | 2.42 | 3.12 | 3.54 | 1.04 | |||||||||||||
| SKEW | 0.14 | -0.06 | -0.30 | -0.28 | 1.24 | 0.57 | -0.33 | -0.09 | -0.47 | -0.18 | -0.43 | -0.06 | -0.74 | |||||||||||||
| MAX | 31.94 | 38.96 | 39.92 | 47.10 | 59.03 | 61.07 | 65.69 | 65.02 | 57.12 | 48.48 | 36.95 | 32.46 | 43.87 | |||||||||||||
| MIN | 15.97 | 19.00 | 24.15 | 32.89 | 42.86 | 51.98 | 57.94 | 56.65 | 46.78 | 38.13 | 24.47 | 16.19 | 39.43 | |||||||||||||
| NO YRS | 37 | 39 | 39 | 35 | 35 | 36 | 40 | 37 | 34 | 35 | 30 | 35 | 18 | |||||||||||||