YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1957 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 23.26 | n | ----- | z |
1958 | 18.40 | 21.91 | 19.31 | 28.30 | 43.60 | 52.53 | 55.61 | 55.08 | a | 47.18 | 38.02 | b | 29.68 | 24.23 | a | 36.16 | ||||||||||
1959 | 19.10 | 17.58 | b | 21.90 | a | 29.50 | a | 38.09 | b | 49.97 | 52.60 | a | 50.31 | b | 43.89 | b | 31.77 | 27.69 | a | 25.10 | b | 33.96 | ||||
1960 | 16.83 | b | 14.47 | 26.14 | b | 33.28 | a | 38.98 | 49.87 | 54.11 | 53.50 | 47.68 | 37.07 | a | 28.45 | 18.12 | a | 34.87 | ||||||||
1961 | 21.68 | 18.61 | 21.52 | 28.29 | b | 39.61 | 48.15 | 51.98 | a | 50.68 | 42.18 | 36.27 | 21.88 | 14.90 | 32.98 | |||||||||||
1962 | 17.32 | a | 18.55 | 17.09 | c | 31.79 | a | 37.44 | 45.80 | 50.08 | 50.73 | 44.05 | b | 37.52 | a | 27.32 | 23.61 | 33.44 | ||||||||
1963 | 12.97 | 20.25 | 19.31 | 28.77 | 42.94 | 45.82 | 53.73 | 51.27 | 48.77 | 42.50 | 29.75 | 20.02 | 34.67 | |||||||||||||
1964 | 14.65 | 13.16 | 15.95 | a | 26.87 | 39.85 | a | 48.50 | a | 55.61 | 51.05 | a | 45.72 | 41.24 | b | 25.27 | d | 15.45 | b | 32.78 | ||||||
1965 | 21.27 | c | 17.73 | 17.68 | a | 29.59 | b | 37.27 | c | 45.75 | 53.27 | a | 51.41 | d | 41.46 | c | 41.25 | c | 29.22 | c | 22.20 | a | 34.01 | |||
1966 | 14.87 | 11.83 | d | 24.93 | c | 31.95 | 42.93 | c | 48.70 | 57.03 | a | 53.72 | a | 47.94 | c | 39.17 | a | 27.55 | a | 20.03 | a | 35.05 | ||||
1967 | 17.03 | 17.65 | a | 25.19 | 27.57 | 36.03 | 44.84 | a | 53.50 | 50.81 | 46.47 | 37.90 | a | 30.02 | 16.00 | a | 33.58 | |||||||||
1968 | 21.92 | a | 22.26 | 23.97 | a | 25.70 | 37.58 | a | 50.12 | 50.24 | 45.88 | b | 42.20 | 37.08 | a | 21.17 | a | 15.06 | 32.77 | |||||||
1969 | 16.68 | a | 15.39 | 17.97 | a | 32.57 | 43.02 | 46.71 | d | 54.69 | 54.31 | 46.98 | 28.47 | 24.68 | 21.19 | 33.56 | ||||||||||
1970 | 16.98 | 20.46 | 18.08 | 22.45 | a | 39.71 | 48.20 | 54.29 | 54.02 | 43.36 | a | 28.79 | 25.90 | a | 18.00 | b | 32.52 | |||||||||
1971 | 17.68 | 16.29 | 20.62 | b | 29.91 | a | 36.14 | c | 44.92 | 52.23 | a | 51.24 | 43.29 | a | 34.10 | b | 25.28 | a | 15.27 | a | 32.25 | |||||
1972 | 18.56 | 20.18 | a | 32.39 | 34.90 | a | 40.97 | 48.63 | 52.50 | 50.61 | 45.07 | 36.52 | 19.48 | 16.61 | 34.70 | |||||||||||
1973 | 16.47 | 18.11 | ----- | z | 24.07 | 37.61 | 46.85 | 52.52 | a | 51.52 | 43.80 | 38.98 | a | 27.66 | a | 20.42 | 34.36 | a | ||||||||
1974 | 17.23 | a | 18.10 | b | 27.48 | 28.05 | a | 42.94 | 50.90 | a | 51.89 | 50.33 | a | 47.48 | a | 36.93 | b | 25.93 | 15.50 | 34.40 | ||||||
1975 | 16.92 | a | 13.62 | b | 19.31 | b | 23.73 | 34.26 | 44.83 | 51.85 | 50.47 | 45.08 | 35.50 | a | 27.07 | a | 22.87 | 32.13 | ||||||||
1976 | 18.84 | 22.86 | 20.48 | 29.90 | 37.75 | m | 45.42 | 49.84 | 46.88 | a | 40.53 | a | 29.00 | 23.36 | a | 18.87 | 31.45 | a | ||||||||
1977 | 14.90 | 17.78 | a | 16.00 | 31.95 | ----- | z | ----- | z | ----- | z | ----- | z | 48.31 | a | 40.69 | ----- | z | ----- | z | 28.27 | f | ||||
1978 | ----- | z | 17.95 | 22.24 | 30.04 | b | ----- | z | 44.50 | ----- | z | ----- | z | ----- | z | 33.81 | r | 28.13 | 10.20 | a | 25.51 | f | ||||
1979 | 10.13 | 22.21 | 20.44 | 29.91 | c | 34.78 | f | 46.88 | 53.60 | 48.32 | f | 47.88 | i | 37.95 | 21.82 | 17.38 | o | 30.37 | d | |||||||
1980 | 16.35 | 17.67 | 23.53 | o | ----- | z | ----- | z | ----- | z | ----- | z | 52.23 | ----- | z | ----- | z | ----- | z | ----- | z | 28.75 | i | |||
1981 | ----- | z | 23.43 | m | 20.69 | d | 33.40 | o | 38.45 | l | ----- | z | 49.92 | l | 48.37 | h | 48.03 | k | 34.79 | l | ----- | z | 21.69 | m | 20.69 | k |
1982 | 17.25 | m | 18.76 | k | 22.62 | k | 27.26 | m | 35.97 | m | 44.50 | m | 52.45 | u | 52.30 | k | 44.44 | d | 33.04 | e | 23.33 | d | 18.02 | b | 29.71 | h |
1983 | 22.63 | a | 20.26 | a | 22.98 | a | 22.93 | a | 36.59 | b | 44.45 | a | 53.53 | 53.77 | 48.30 | 37.97 | 25.44 | c | 15.63 | a | 33.71 | |||||
1984 | 18.89 | 19.90 | 22.27 | a | 26.07 | 42.05 | b | 46.45 | a | 54.45 | 52.10 | 45.00 | d | 29.43 | a | 22.98 | a | ----- | z | 34.51 | a | |||||
1985 | 19.38 | a | 16.63 | b | 23.73 | e | 33.14 | b | 39.69 | 49.71 | a | 54.12 | c | 53.38 | e | 41.55 | b | 36.13 | e | 22.97 | k | 22.16 | l | 36.75 | b | |
1986 | 26.61 | q | 16.78 | e | 27.64 | b | 31.27 | f | 37.84 | c | 48.45 | 51.02 | 52.87 | 41.10 | 32.85 | 25.65 | 22.29 | 35.65 | b | |||||||
1987 | 19.48 | 21.52 | 22.03 | 32.10 | 37.92 | 49.80 | 53.23 | 50.87 | 44.33 | 39.35 | 25.47 | 16.90 | 34.42 | |||||||||||||
1988 | 16.66 | 21.50 | 19.69 | 30.73 | 39.61 | 50.40 | 53.68 | 52.15 | 43.90 | 40.63 | 22.32 | 17.85 | 34.09 | |||||||||||||
1989 | 18.15 | 19.04 | 29.55 | 34.78 | 42.13 | 47.48 | 54.45 | 50.06 | 45.78 | 34.89 | 27.43 | o | 20.02 | 36.03 | a | |||||||||||
1990 | 17.00 | 18.83 | a | 24.85 | 32.31 | a | 37.94 | 52.33 | a | 52.35 | a | 50.65 | 48.45 | 35.55 | b | 27.38 | b | 13.55 | 34.27 | |||||||
1991 | 15.69 | 23.43 | 19.50 | 25.67 | l | 39.44 | e | 48.05 | a | 52.65 | 51.92 | 45.62 | 38.53 | 23.33 | 20.98 | 34.47 | a | |||||||||
1992 | 20.40 | b | 21.52 | 25.68 | 36.42 | 42.09 | b | 49.70 | b | 51.95 | 51.35 | 47.53 | 38.33 | d | 17.97 | 14.20 | c | 34.76 | ||||||||
1993 | 18.04 | e | 16.42 | d | 24.07 | d | 28.30 | e | 36.91 | c | 46.48 | d | 53.22 | b | 50.39 | d | 43.54 | b | 33.44 | e | 21.07 | c | 16.52 | b | 32.37 | |
1994 | 18.19 | 13.98 | a | 24.69 | e | 28.43 | 38.87 | 51.72 | g | 53.91 | c | 53.83 | h | 44.68 | e | 31.79 | c | 19.03 | 20.61 | 29.42 | b | |||||
1995 | 14.98 | b | 24.76 | c | 22.82 | 23.94 | l | 33.52 | b | 44.24 | i | 51.21 | 54.36 | m | 44.62 | 36.44 | 28.71 | a | 20.55 | a | 30.84 | c | ||||
1996 | 15.03 | a | 22.24 | 22.15 | 28.97 | 44.31 | 49.72 | a | 54.36 | b | 52.93 | c | 42.02 | a | 32.97 | b | 25.54 | d | 15.92 | a | 33.85 | |||||
1997 | 15.47 | 16.94 | a | 26.29 | 25.22 | 38.48 | 46.08 | r | 52.26 | f | 50.95 | 47.20 | 33.03 | b | 23.12 | 17.34 | 29.40 | b | ||||||||
1998 | 17.40 | 15.16 | 20.92 | 24.47 | 39.00 | 45.48 | d | 54.91 | b | 52.52 | c | 49.05 | 34.47 | 25.05 | 19.40 | 33.15 | ||||||||||
1999 | 19.97 | b | 20.70 | a | 28.27 | a | 26.00 | 30.41 | n | 45.88 | a | 52.76 | 50.91 | d | 43.32 | 38.88 | b | 33.04 | b | 18.24 | 34.36 | a | ||||
2000 | 18.79 | 20.02 | a | 22.23 | 33.22 | a | 42.63 | a | 50.08 | d | 54.60 | b | 53.14 | f | 47.63 | 35.59 | b | 16.77 | 19.23 | a | 32.80 | a | ||||
2001 | 14.97 | a | 17.68 | 22.48 | a | 30.37 | 41.85 | 49.93 | 54.27 | 51.35 | a | 46.82 | 37.52 | b | 26.57 | ----- | z | 35.80 | a | |||||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 17.45 | 18.62 | 22.45 | 29.28 | 39.44 | 47.90 | 53.21 | 51.51 | 45.16 | 36.04 | 25.13 | 18.40 | 33.78 | |||||||||||||
S.D. | 2.47 | 2.97 | 3.69 | 3.47 | 2.70 | 2.25 | 1.58 | 1.82 | 2.37 | 3.54 | 3.57 | 3.26 | 1.00 | |||||||||||||
SKEW | -0.28 | -0.18 | 0.43 | -0.11 | -0.06 | 0.15 | -0.14 | -0.78 | -0.13 | -0.47 | -0.32 | -0.04 | 0.18 | |||||||||||||
MAX | 22.63 | 24.76 | 32.39 | 36.42 | 44.31 | 52.53 | 57.03 | 55.08 | 49.05 | 42.50 | 33.04 | 25.10 | 36.16 | |||||||||||||
MIN | 10.13 | 11.83 | 15.95 | 22.45 | 33.52 | 44.45 | 49.84 | 45.88 | 40.53 | 28.47 | 16.77 | 10.20 | 32.13 | |||||||||||||
YRS | 40 | 42 | 41 | 38 | 36 | 37 | 38 | 36 | 40 | 41 | 39 | 37 | 25 |