YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1957 | ----- | z | ----- | z | 32.92 | e | 35.37 | 45.16 | 54.43 | 62.32 | 61.61 | 48.70 | 43.90 | 28.53 | 26.46 | c | 43.94 | b | ||||||||
1958 | 22.29 | 27.93 | 28.00 | 36.76 | a | 48.84 | 58.24 | a | 60.57 | a | 60.65 | 53.63 | 42.19 | 30.10 | 20.97 | 40.85 | ||||||||||
1959 | 20.46 | c | 21.56 | a | 25.10 | 37.71 | b | 45.45 | 55.87 | 57.33 | p | 58.95 | k | 47.40 | 37.71 | 25.62 | a | 24.73 | i | 35.21 | c | |||||
1960 | 20.32 | 17.79 | 27.10 | 34.20 | 41.92 | g | 54.95 | k | 58.69 | e | 56.22 | h | 51.58 | d | 39.61 | 28.33 | c | 19.97 | 33.07 | c | ||||||
1961 | 17.58 | g | 24.46 | 29.10 | a | 33.32 | e | 42.88 | e | 52.04 | c | 56.79 | g | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 36.36 | g | |
1962 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1963 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 49.17 | 56.68 | f | 55.85 | e | 53.26 | c | 42.68 | c | 30.33 | i | 17.79 | c | 43.75 | g | |
1964 | 16.57 | c | 16.68 | d | 24.39 | h | 33.70 | g | 43.40 | k | 51.44 | l | 60.26 | 60.00 | f | 54.36 | e | 41.50 | e | 30.41 | m | 24.00 | g | 37.87 | g | |
1965 | 23.35 | e | 20.06 | k | 22.88 | f | 38.91 | g | 46.92 | g | 53.52 | i | 60.00 | s | 57.96 | f | 49.76 | i | 38.48 | d | 30.55 | j | 25.91 | h | 30.91 | j |
1966 | 13.30 | d | 20.96 | b | 30.05 | l | 38.00 | b | 45.38 | e | 56.62 | a | 63.36 | i | 57.83 | h | 52.00 | d | 37.41 | d | 31.58 | f | 21.35 | e | 35.63 | d |
1967 | 19.25 | c | 22.72 | c | 32.38 | b | 38.27 | h | 43.68 | c | 54.42 | f | 60.38 | e | 57.75 | k | 50.73 | h | 40.26 | d | 30.52 | g | 20.78 | h | 36.45 | f |
1968 | 24.19 | d | 27.32 | d | 29.79 | g | 35.37 | 43.88 | f | 53.29 | i | 59.14 | c | 56.32 | f | 46.67 | f | 39.88 | e | 28.64 | h | 16.80 | u | 37.18 | g | |
1969 | 29.00 | a | 24.35 | e | 24.27 | e | 38.96 | c | 44.75 | g | 53.19 | d | 62.04 | g | 60.86 | q | 53.41 | h | 40.67 | d | 27.19 | i | 23.55 | k | 35.07 | f |
1970 | 19.35 | h | 27.37 | i | 26.04 | d | 34.14 | i | 43.52 | h | 52.62 | i | 61.40 | f | 58.86 | i | 51.00 | h | 39.00 | f | 28.70 | j | 24.21 | c | 25.13 | j |
1971 | 20.36 | f | 20.75 | d | 28.96 | f | 35.50 | h | 43.29 | j | 54.09 | h | 59.90 | j | 56.20 | p | 48.73 | h | 39.92 | f | 32.05 | k | 24.05 | i | 20.75 | k |
1972 | 22.69 | e | 20.89 | j | 31.52 | h | 36.14 | p | 45.38 | e | 54.35 | g | 59.28 | m | 57.80 | p | 52.67 | o | 39.94 | o | 25.81 | n | 20.67 | m | 34.04 | j |
1973 | 21.67 | g | 24.71 | g | 28.00 | m | 27.35 | j | 43.00 | k | 49.26 | k | 57.76 | n | 55.86 | i | 49.12 | m | 37.86 | j | 32.22 | g | 20.88 | n | ----- | z |
1974 | 21.19 | j | 20.76 | g | 31.29 | g | 31.17 | l | ----- | z | ----- | z | ----- | z | 55.61 | m | 48.83 | g | 42.77 | 27.36 | e | 22.55 | 30.89 | i | ||
1975 | 23.70 | a | 22.70 | e | 28.13 | 32.67 | 39.23 | 51.48 | a | 56.94 | 53.77 | 48.47 | k | 34.13 | 21.96 | g | 20.72 | b | 36.35 | b | ||||||
1976 | 17.60 | a | 28.40 | i | 26.94 | 35.90 | 43.68 | 50.90 | 58.00 | a | 55.53 | a | 50.17 | a | 34.39 | 23.15 | c | 17.62 | b | 37.62 | a | |||||
1977 | 18.26 | 24.62 | g | 26.55 | 37.20 | 45.97 | 53.07 | a | 59.35 | 60.94 | 53.70 | 42.13 | 29.50 | b | 31.16 | 41.62 | a | |||||||||
1978 | 20.11 | d | ----- | z | 30.71 | 39.13 | 43.84 | 56.52 | a | 60.42 | 57.26 | 51.23 | d | 40.97 | 35.71 | b | 22.32 | f | 43.59 | b | ||||||
1979 | 20.42 | 24.68 | c | 28.29 | 35.67 | 47.90 | a | 50.36 | e | 58.55 | 54.57 | a | 48.44 | c | 38.73 | a | 23.52 | e | 22.29 | 37.78 | ||||||
1980 | 25.96 | f | 27.71 | l | 25.16 | 32.33 | 44.16 | 54.82 | b | 61.04 | h | 59.57 | a | 53.74 | c | 37.24 | b | 26.21 | a | 27.62 | g | 41.65 | d | |||
1981 | 18.86 | b | 23.62 | b | 29.07 | b | 40.20 | 47.80 | a | 56.52 | a | 60.36 | c | 57.77 | 51.19 | c | 42.04 | e | 30.64 | b | 26.18 | c | 40.35 | |||
1982 | 22.97 | b | 23.04 | e | 30.68 | 37.37 | c | 44.42 | 54.13 | 60.37 | a | 60.97 | b | 53.17 | 36.90 | 29.45 | a | 24.92 | g | 41.22 | a | |||||
1983 | 23.79 | b | 25.48 | e | 31.10 | a | 31.59 | c | 40.90 | 50.27 | 58.48 | d | 59.29 | c | 55.07 | b | 45.39 | 33.38 | a | 17.52 | f | 41.34 | a | |||
1984 | 21.26 | 23.58 | e | 27.86 | b | 31.92 | d | 48.11 | c | 55.69 | d | 58.00 | f | 58.52 | f | 47.84 | e | 39.50 | a | 32.55 | a | 24.96 | d | 35.33 | b | |
1985 | 20.03 | a | 21.61 | e | 31.57 | a | 39.67 | 47.75 | c | 54.56 | c | 56.89 | c | 58.07 | d | 50.35 | d | 42.84 | f | 33.17 | f | 19.57 | a | 40.01 | b | |
1986 | 24.50 | a | 26.92 | b | 33.76 | b | 38.27 | d | 45.62 | b | 53.42 | k | 58.70 | d | 58.13 | h | 50.24 | a | 39.45 | b | 26.93 | a | 21.33 | d | 36.57 | b |
1987 | 20.17 | a | 24.85 | a | 26.37 | a | 33.76 | a | 43.93 | a | 53.50 | b | 55.40 | a | 56.19 | 48.36 | b | 41.69 | b | 25.38 | a | 20.42 | 37.50 | |||
1988 | 20.59 | d | 24.31 | 25.64 | c | 33.92 | d | 42.20 | a | 54.03 | a | 57.95 | l | 59.26 | d | 50.14 | b | 39.46 | c | 29.71 | b | 19.65 | h | 37.93 | b | |
1989 | 22.47 | a | 23.50 | 30.50 | a | 38.28 | e | 49.03 | a | 52.89 | c | 59.15 | d | 58.92 | e | 48.63 | c | 38.97 | b | 28.63 | 14.23 | e | 38.77 | |||
1990 | 23.07 | c | 23.52 | a | 33.10 | 38.72 | a | 46.83 | b | 59.33 | 59.31 | b | 55.53 | a | 53.77 | d | 39.72 | b | 30.59 | a | 17.54 | e | 40.09 | |||
1991 | 21.57 | c | 26.20 | c | 29.68 | 38.83 | a | 45.89 | c | 55.20 | 59.19 | d | 57.86 | b | 50.39 | b | 39.93 | c | 27.97 | a | 23.85 | e | 39.71 | |||
1992 | 20.10 | b | 26.23 | c | 30.07 | b | 40.72 | a | 48.81 | e | 52.88 | d | 57.38 | g | 57.16 | 49.82 | b | 41.88 | e | 25.75 | b | 20.81 | 37.66 | a | ||
1993 | 25.71 | c | 25.27 | b | 31.35 | 37.14 | a | 45.36 | c | 53.46 | d | 61.42 | e | 59.96 | d | 47.83 | 35.35 | e | 26.27 | 22.50 | e | 39.30 | ||||
1994 | 21.70 | d | 19.85 | a | 31.29 | c | 34.45 | a | 46.21 | c | 58.09 | g | 59.00 | i | 59.68 | c | 51.35 | g | 38.50 | g | 30.79 | a | 27.50 | g | 34.85 | e |
1995 | 25.85 | k | 30.41 | f | 34.04 | g | 34.28 | a | 44.81 | e | 53.48 | a | 57.26 | h | 59.79 | c | 52.88 | d | 38.88 | e | 33.96 | e | 26.13 | h | 45.44 | e |
1996 | 21.76 | j | 27.75 | a | 25.09 | h | 37.41 | a | 52.44 | d | 58.26 | c | 60.84 | f | 58.39 | c | 50.71 | f | 38.70 | h | 26.90 | j | 27.00 | i | 46.85 | g |
1997 | 19.80 | f | 20.88 | d | 27.52 | b | 33.59 | a | 47.21 | g | 52.89 | b | 57.68 | f | 59.08 | f | 54.93 | c | 41.67 | a | 25.31 | d | 21.04 | h | 36.68 | e |
1998 | 26.20 | a | 26.11 | a | 27.57 | a | 32.85 | c | 46.07 | b | 54.41 | a | 59.88 | g | 57.23 | e | 53.00 | a | 40.73 | e | 33.32 | b | 21.77 | i | 39.75 | b |
1999 | 26.85 | d | 25.04 | d | 29.74 | d | 35.88 | d | 44.81 | d | 51.62 | d | 58.16 | f | 57.96 | c | 50.27 | d | 36.61 | h | 29.68 | e | 21.08 | e | 37.29 | b |
2000 | 20.17 | g | 26.92 | d | 30.10 | a | 39.70 | 47.96 | e | 56.89 | c | 59.05 | j | 57.83 | b | 50.25 | b | 44.14 | c | 25.30 | c | 18.04 | h | 42.12 | c | |
2001 | 20.17 | a | 23.76 | g | 32.33 | d | 38.68 | b | 46.59 | i | 55.56 | c | 61.33 | j | 57.75 | c | 51.26 | c | 38.64 | c | 33.32 | b | 21.31 | e | 38.78 | c |
2002 | 25.00 | c | 20.89 | a | 26.00 | e | 41.63 | c | 44.17 | m | 56.12 | d | ----- | z | 59.50 | c | 52.21 | a | 40.24 | f | 29.56 | e | 27.17 | b | 37.56 | c |
2003 | 25.30 | a | 27.35 | e | 32.38 | b | 37.03 | a | 46.06 | 53.50 | 59.05 | j | 58.93 | c | 51.71 | f | 45.07 | d | 34.04 | c | 23.32 | i | 39.96 | c | ||
2004 | 25.68 | c | 21.26 | f | 36.85 | e | 38.63 | c | 46.79 | c | 54.57 | b | 57.41 | i | 57.24 | b | 49.61 | b | 42.96 | e | 30.07 | c | 25.08 | e | 40.75 | b |
2005 | 29.11 | c | 29.93 | a | 30.57 | j | 36.32 | b | 46.79 | b | 53.92 | d | 57.79 | l | 57.50 | a | 53.37 | c | 42.12 | g | 29.85 | c | 22.08 | e | 39.87 | c |
2006 | 24.52 | 22.19 | b | 29.58 | e | 40.17 | 50.97 | b | 56.30 | c | 61.57 | q | 60.19 | j | 48.79 | b | 39.72 | f | 30.26 | g | 25.57 | c | 37.26 | d | ||
2007 | 17.68 | c | 26.23 | b | 32.60 | a | 33.12 | f | 44.85 | d | 51.81 | d | 57.95 | i | 60.11 | d | 53.67 | f | 39.12 | g | 30.93 | c | 23.26 | d | 35.93 | d |
2008 | 17.93 | c | 23.85 | c | 29.14 | b | 34.85 | d | 46.20 | f | 55.96 | f | 58.71 | j | 57.57 | c | 47.96 | c | 39.08 | g | 30.24 | a | 20.31 | e | 32.73 | d |
2009 | 22.97 | b | 26.37 | a | 33.52 | b | 35.56 | e | 47.84 | f | ----- | z | 59.75 | w | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 29.60 | h |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 21.99 | 24.04 | 29.50 | 36.52 | 45.84 | 54.17 | 59.23 | 58.19 | 51.10 | 40.19 | 29.19 | 22.15 | 39.29 | |||||||||||||
S.D. | 3.35 | 2.87 | 2.85 | 2.62 | 2.57 | 2.33 | 1.60 | 1.88 | 2.25 | 2.70 | 3.13 | 3.42 | 1.20 | |||||||||||||
SKEW | -0.06 | -0.45 | 0.21 | -0.11 | 0.04 | 0.04 | -0.44 | -0.34 | 0.08 | -0.27 | 0.04 | 0.26 | -0.34 | |||||||||||||
MAX | 29.11 | 29.93 | 36.85 | 41.63 | 52.44 | 59.33 | 62.32 | 61.61 | 55.07 | 45.39 | 35.71 | 31.16 | 40.85 | |||||||||||||
MIN | 13.30 | 16.68 | 24.27 | 31.59 | 39.23 | 49.17 | 55.40 | 53.77 | 47.40 | 34.13 | 23.15 | 14.23 | 37.50 | |||||||||||||
YRS | 40 | 38 | 40 | 42 | 37 | 38 | 21 | 33 | 36 | 37 | 35 | 29 | 8 |