YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1964 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 52.19 | 45.35 | 42.94 | 24.05 | 17.75 | a | 36.46 | g | ||||
1965 | 21.90 | 19.98 | 19.15 | 26.77 | b | 33.30 | a | 41.32 | 51.98 | 51.92 | 40.29 | a | 43.34 | 27.52 | 22.30 | a | 33.31 | |||||||||
1966 | 16.48 | a | 14.05 | 26.74 | 32.92 | 41.97 | b | 48.23 | b | 54.84 | l | 54.22 | a | 47.67 | a | 36.16 | b | 28.03 | 21.89 | 33.49 | a | |||||
1967 | 20.65 | a | 21.86 | 24.30 | c | 19.96 | b | 35.18 | 42.40 | a | 54.98 | a | 54.00 | 45.48 | 40.61 | 30.60 | 14.68 | a | 33.73 | |||||||
1968 | 23.48 | 24.48 | a | 24.13 | a | 26.25 | 37.08 | 50.28 | 53.24 | 47.45 | 45.95 | a | 38.31 | 25.00 | 16.53 | 34.35 | ||||||||||
1969 | 21.11 | 16.74 | a | 19.03 | 30.47 | 42.18 | 44.15 | 54.79 | 56.08 | 48.33 | 29.87 | 27.52 | 22.18 | 34.37 | ||||||||||||
1970 | 18.85 | 22.73 | 19.74 | 22.43 | a | 37.12 | a | 45.83 | c | 53.87 | 54.06 | 43.37 | 33.28 | a | 27.71 | a | 18.58 | a | 33.13 | |||||||
1971 | 20.15 | 18.20 | a | 22.81 | b | 29.21 | b | 31.89 | d | 48.66 | a | 57.50 | a | 52.80 | a | 44.98 | c | 31.11 | 25.30 | 14.03 | b | 33.05 | ||||
1972 | 19.66 | 23.66 | 30.77 | a | 30.59 | a | 40.84 | b | 48.46 | c | 58.33 | b | 52.45 | a | ----- | z | 31.83 | a | 19.55 | a | 16.20 | a | 33.85 | a | ||
1973 | 16.27 | a | 19.07 | a | 17.73 | a | 25.50 | 39.42 | 48.12 | 54.89 | 53.53 | 45.20 | 38.53 | a | 24.08 | 22.39 | 33.73 | |||||||||
1974 | 15.72 | b | 19.35 | b | 25.98 | c | 26.62 | a | 41.45 | 54.48 | a | 53.37 | 53.40 | a | 48.58 | 38.30 | a | 26.40 | a | 17.03 | a | 35.06 | ||||
1975 | 20.10 | b | 17.85 | e | 22.09 | h | 21.34 | e | 33.95 | c | 46.12 | d | 53.70 | d | 53.43 | c | 47.85 | d | 35.67 | b | 27.42 | e | 25.83 | e | 34.84 | a |
1976 | 23.21 | e | 23.09 | a | 19.39 | h | 28.48 | h | 41.27 | a | 48.65 | 55.23 | 51.25 | g | 44.84 | e | 34.97 | a | 32.40 | e | 25.66 | c | 36.59 | c | ||
1977 | 20.41 | b | 24.83 | a | 17.00 | f | 35.17 | c | 32.84 | f | 52.33 | c | 54.59 | b | 53.70 | d | 46.60 | d | 40.27 | g | 29.12 | 21.81 | g | 39.59 | d | |
1978 | 20.15 | d | 18.52 | c | 27.56 | e | 26.57 | c | 35.88 | e | 48.74 | i | 56.07 | c | 53.44 | d | 44.50 | b | 41.15 | a | 25.48 | d | 15.77 | 33.19 | a | |
1979 | 11.91 | d | 16.86 | c | 21.62 | c | 28.80 | h | 37.22 | b | 48.21 | d | 55.21 | b | 49.84 | b | 50.63 | g | 40.48 | g | 22.90 | e | 26.43 | d | 32.25 | c |
1980 | 22.00 | f | 24.35 | c | 17.67 | e | 27.36 | e | 31.98 | f | 46.66 | e | 55.19 | d | 52.24 | b | 46.07 | c | 37.04 | d | 29.30 | c | 30.48 | c | 36.64 | b |
1981 | 23.93 | h | 23.05 | f | 19.73 | c | 33.45 | h | 34.74 | d | 52.12 | e | 55.67 | d | 54.06 | e | 46.15 | f | 31.07 | h | 27.94 | d | 24.02 | f | 40.71 | f |
1982 | 17.33 | e | 20.37 | e | 20.65 | h | 26.05 | j | 36.20 | i | 44.92 | f | 51.48 | e | 52.10 | e | 42.94 | f | 31.37 | d | 23.38 | d | 20.87 | e | 30.98 | e |
1983 | 23.79 | l | 20.20 | h | 21.55 | l | 22.20 | o | 35.12 | o | 43.66 | n | 50.47 | o | 50.26 | h | 50.09 | m | 36.16 | i | 25.79 | r | 18.96 | g | ----- | z |
1984 | 22.35 | a | 21.79 | a | 23.03 | a | 26.43 | 43.70 | c | 47.22 | a | 54.21 | b | 52.70 | c | 47.75 | b | 27.04 | d | ----- | z | 16.93 | c | 34.83 | a | |
1985 | 18.69 | d | 17.09 | a | 19.40 | a | 33.41 | b | 39.38 | a | 52.07 | a | 56.71 | b | 54.67 | e | 41.62 | e | 35.52 | b | 22.05 | b | 25.50 | a | 34.68 | |
1986 | 28.50 | 20.94 | a | 28.53 | a | 28.66 | a | 39.35 | a | 51.37 | 51.90 | 54.47 | 39.65 | 32.52 | a | 26.48 | b | 22.47 | 35.40 | |||||||
1987 | 18.27 | c | 17.44 | a | 19.90 | 34.73 | b | 37.85 | a | 51.12 | a | 52.12 | a | 52.00 | 47.90 | 40.17 | a | 24.79 | b | 15.28 | b | 34.30 | ||||
1988 | 18.05 | 24.79 | 21.95 | b | 31.03 | a | 37.45 | 50.53 | a | 57.09 | b | 52.82 | 45.93 | 44.12 | b | 24.08 | 19.74 | b | 35.63 | |||||||
1989 | 18.23 | a | 18.37 | b | 27.42 | a | 36.57 | b | 39.47 | 48.48 | 57.58 | 51.18 | 47.13 | 36.61 | c | 30.45 | a | 24.98 | 36.37 | |||||||
1990 | 19.08 | 17.52 | a | 24.81 | 32.66 | a | 36.90 | a | 51.12 | 55.85 | 52.12 | a | 48.79 | a | 38.92 | a | 27.45 | 15.98 | a | 35.10 | ||||||
1991 | 20.35 | 27.27 | 17.34 | 25.30 | 33.87 | a | 45.29 | a | 55.45 | 53.15 | a | 47.50 | 38.27 | 25.35 | 22.47 | a | 34.30 | |||||||||
1992 | 22.35 | 21.43 | 22.53 | b | 34.95 | a | 39.40 | 46.09 | a | 51.55 | a | 53.42 | 48.75 | 39.97 | 22.74 | c | 17.53 | a | 35.06 | |||||||
1993 | 18.79 | 17.45 | 27.15 | 30.15 | 39.85 | a | 45.27 | 52.53 | 52.47 | 48.23 | b | 37.40 | b | 24.27 | 22.20 | a | 34.65 | |||||||||
1994 | 23.76 | 18.07 | a | 28.92 | 32.12 | b | 39.78 | b | 54.25 | 58.55 | 56.83 | a | 48.72 | 35.07 | a | 20.10 | a | 22.45 | 36.55 | |||||||
1995 | 19.53 | ----- | z | 24.24 | 29.17 | d | 33.68 | a | 44.07 | b | 55.84 | ----- | z | 50.93 | 41.92 | 36.10 | a | 24.93 | b | 36.04 | b | |||||
1996 | 22.70 | a | 27.98 | b | 27.55 | b | 34.52 | a | ----- | z | 55.50 | 60.06 | 59.65 | 47.53 | 37.47 | 29.47 | a | 23.47 | b | 38.72 | a | |||||
1997 | 22.81 | b | 22.74 | c | 33.85 | 30.02 | 46.20 | a | 51.86 | a | 58.37 | a | 57.90 | a | 51.08 | 40.93 | d | 32.84 | a | ----- | z | 40.78 | a | |||
1998 | 25.81 | 21.12 | 29.41 | b | 29.84 | a | 38.98 | 48.83 | a | 60.12 | a | 60.54 | f | 51.50 | a | 39.05 | b | 32.52 | b | 24.93 | c | 36.56 | a | |||
1999 | 25.90 | a | 26.04 | b | 32.91 | c | 25.76 | a | 41.48 | a | 52.32 | e | 56.88 | e | 56.70 | a | 53.95 | a | 47.64 | b | 40.16 | a | 26.81 | e | 40.55 | |
2000 | 28.24 | b | 31.25 | c | 34.79 | b | 44.84 | e | 48.35 | 54.30 | 57.90 | a | 58.33 | a | 50.81 | a | 40.52 | 30.43 | b | 28.41 | b | 42.35 | ||||
2001 | 23.84 | 27.07 | a | 39.15 | r | 23.45 | b | 38.73 | e | 48.20 | b | 55.62 | j | 60.11 | d | 56.52 | 47.80 | d | 31.83 | a | 19.85 | g | 39.73 | c | ||
2002 | 20.73 | c | 25.32 | c | 24.42 | 36.31 | a | 45.12 | c | 58.26 | c | 63.07 | a | 59.17 | a | 49.57 | 37.89 | 30.41 | c | 21.92 | a | 39.35 | ||||
2003 | 30.35 | 21.81 | a | 27.28 | b | ----- | z | ----- | z | ----- | z | 66.02 | a | 57.74 | b | 49.80 | 43.58 | a | 21.89 | b | 20.92 | a | 37.71 | c | ||
2004 | 20.57 | c | 16.42 | c | ----- | z | 29.59 | a | 40.65 | 50.98 | a | 55.27 | a | 52.23 | a | 46.23 | b | ----- | z | 21.65 | 23.66 | f | 37.07 | c | ||
2005 | 21.98 | a | 19.98 | 22.43 | a | 28.88 | a | 39.02 | a | 44.30 | 60.06 | g | 52.06 | 46.32 | b | 37.69 | 29.74 | a | 21.90 | 33.12 | a | |||||
2006 | 19.81 | 21.08 | d | 18.81 | g | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 20.44 | j | |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 20.98 | 21.26 | 24.55 | 29.70 | 38.93 | 49.12 | 55.87 | 53.96 | 47.33 | 37.96 | 27.21 | 21.32 | 35.48 | |||||||||||||
S.D. | 3.63 | 3.80 | 4.72 | 4.96 | 3.71 | 3.82 | 3.11 | 2.71 | 3.35 | 4.63 | 4.32 | 4.20 | 2.44 | |||||||||||||
SKEW | 0.40 | 0.49 | 0.35 | 0.54 | 0.34 | 0.13 | 1.13 | 0.51 | 0.14 | -0.08 | 0.63 | 0.03 | 1.62 | |||||||||||||
MAX | 30.35 | 31.25 | 34.79 | 44.84 | 48.35 | 58.26 | 66.02 | 60.11 | 56.52 | 47.80 | 40.16 | 30.48 | 42.35 | |||||||||||||
MIN | 11.91 | 14.05 | 17.34 | 19.96 | 31.89 | 41.32 | 51.48 | 47.45 | 39.65 | 27.04 | 19.55 | 14.03 | 33.05 | |||||||||||||
YRS | 39 | 39 | 34 | 35 | 35 | 37 | 37 | 38 | 37 | 37 | 40 | 36 | 21 |