YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1939 | 14.50 | o | 11.82 | 26.19 | 33.03 | 39.55 | 47.13 | 50.48 | 49.81 | 46.13 | 31.93 | a | 24.10 | 18.37 | a | 34.41 | a | |||||||||
1940 | 15.03 | 15.83 | 25.58 | 30.47 | 38.81 | 41.83 | 49.94 | 48.16 | 41.40 | 33.23 | 20.27 | 19.74 | 31.69 | |||||||||||||
1941 | 14.90 | 23.50 | 22.00 | 30.57 | 39.00 | 43.27 | 46.55 | 49.50 | o | 44.11 | l | 33.19 | 23.20 | 13.06 | o | 30.69 | c | |||||||||
1942 | 22.10 | ----- | z | ----- | z | 33.83 | x | 36.03 | 51.24 | a | 59.97 | 51.45 | 43.30 | 33.55 | 27.97 | 23.23 | 38.76 | c | ||||||||
1943 | 16.97 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 53.00 | v | 51.50 | c | 39.40 | ----- | z | ----- | z | ----- | z | 35.96 | i | ||
1944 | 10.43 | a | ----- | z | 24.33 | j | 27.79 | a | 35.71 | 46.53 | 51.39 | 50.39 | 39.53 | 35.77 | 23.37 | 14.94 | m | 35.66 | c | |||||||
1945 | 12.52 | ----- | z | 22.05 | l | 24.93 | 34.07 | b | 41.67 | 50.32 | 52.32 | 45.90 | a | 33.32 | 23.07 | a | 11.93 | a | 33.01 | b | ||||||
1946 | 13.43 | a | 17.07 | 25.45 | 35.23 | 37.77 | 49.67 | 54.04 | e | 57.67 | g | 52.72 | a | 41.73 | a | 31.61 | b | 19.16 | l | 35.87 | b | |||||
1947 | 14.27 | a | 21.79 | 25.06 | 29.50 | 40.35 | 45.83 | 53.61 | m | 51.47 | a | 45.04 | f | 37.52 | 19.55 | a | 15.03 | 30.04 | b | |||||||
1948 | 13.58 | 18.55 | 20.32 | 35.53 | 40.81 | 48.68 | b | 53.10 | b | 53.17 | y | ----- | z | ----- | z | ----- | z | 22.42 | 31.62 | d | ||||||
1949 | 13.23 | 18.61 | 25.29 | 31.30 | 38.77 | 47.90 | 53.77 | 50.20 | f | 45.62 | i | 33.48 | d | 26.33 | 14.90 | a | 30.36 | b | ||||||||
1950 | 21.39 | 23.22 | a | 26.39 | h | 33.63 | 37.58 | 46.93 | 51.71 | 47.23 | 41.10 | 36.94 | 25.69 | a | 20.97 | 35.13 | a | |||||||||
1951 | 16.68 | 18.48 | a | 25.29 | 30.52 | a | 40.68 | 46.47 | 55.26 | 53.48 | j | 45.43 | i | 34.36 | c | 22.48 | i | 17.27 | e | 31.67 | c | |||||
1952 | 23.63 | a | 20.83 | 21.34 | b | 32.13 | 41.06 | 50.23 | 52.23 | i | 53.05 | k | 44.22 | c | 32.84 | 19.10 | 15.71 | 30.11 | b | |||||||
1953 | 22.19 | 16.04 | 26.97 | a | 30.43 | 35.61 | 47.97 | 52.13 | 49.63 | d | 42.61 | l | 32.53 | p | 26.10 | 13.57 | a | 32.06 | b | |||||||
1954 | 17.84 | 23.18 | 23.50 | a | 33.90 | 39.16 | 47.60 | 53.58 | 50.65 | 47.97 | 36.23 | a | 25.10 | 14.63 | a | 34.44 | ||||||||||
1955 | 13.58 | 13.50 | 24.52 | 28.36 | b | 37.90 | a | 44.37 | 49.06 | 52.42 | 44.52 | a | 34.74 | 22.93 | 20.61 | 32.21 | ||||||||||
1956 | 23.68 | 16.55 | 23.57 | a | 26.63 | 37.03 | a | 45.00 | 49.23 | a | 48.55 | 43.10 | 34.71 | 18.67 | 16.95 | i | 33.34 | a | ||||||||
1957 | 23.61 | 27.04 | 26.58 | e | 28.93 | 35.53 | a | 44.17 | a | 53.40 | a | 51.37 | a | 41.97 | 35.00 | 23.92 | f | 18.18 | t | 36.76 | b | |||||
1958 | 17.26 | 23.79 | 22.55 | 29.14 | b | 40.90 | j | 46.63 | 52.26 | 51.94 | 46.07 | 34.67 | a | 19.74 | k | 16.17 | y | 36.03 | c | |||||||
1959 | 13.58 | ----- | z | ----- | z | 29.67 | i | ----- | z | ----- | z | 47.17 | g | 49.00 | ----- | z | ----- | z | ----- | z | ----- | z | 31.29 | j | ||
1960 | ----- | z | ----- | z | ----- | z | 39.17 | r | 42.93 | b | 56.37 | c | 57.19 | d | 56.50 | k | 51.30 | c | 45.57 | x | 32.06 | n | 18.25 | o | 51.95 | h |
1961 | ----- | z | ----- | z | ----- | z | ----- | z | 44.39 | 51.87 | 54.68 | 54.58 | 46.87 | 38.91 | h | 26.07 | 19.65 | 42.58 | e | |||||||
1962 | 18.27 | a | 29.00 | 25.43 | c | 38.45 | a | 45.62 | b | 49.47 | 54.19 | 57.30 | a | 50.64 | b | 40.41 | b | 31.70 | 23.68 | 38.68 | ||||||
1963 | 15.19 | 24.50 | b | 28.37 | a | 38.03 | 46.57 | a | 50.43 | b | 57.00 | 54.62 | b | 51.45 | a | 44.97 | 30.73 | 20.18 | c | 38.50 | ||||||
1964 | 16.24 | b | 15.52 | 24.94 | 34.40 | 43.58 | 50.93 | 56.77 | 55.03 | 49.90 | 40.58 | 29.37 | 22.27 | a | 36.63 | |||||||||||
1965 | 23.97 | a | 21.32 | 24.29 | 36.39 | b | 42.53 | a | 49.37 | 56.55 | 53.41 | b | 48.43 | b | 33.74 | 27.37 | 25.13 | p | 37.94 | a | ||||||
1966 | 11.37 | d | 14.32 | 24.16 | 32.10 | 40.19 | 47.97 | 54.35 | 50.23 | 43.60 | 32.48 | 27.40 | 16.61 | 32.90 | ||||||||||||
1967 | 12.17 | a | 21.61 | 30.39 | 34.13 | 38.16 | 46.37 | 54.42 | 49.16 | 43.10 | 33.68 | 26.67 | 13.33 | a | 33.60 | |||||||||||
1968 | 15.03 | 19.95 | g | 24.74 | 29.90 | 38.71 | 46.53 | 51.48 | 49.72 | b | 41.50 | 31.74 | 25.30 | 12.12 | o | 35.47 | b | |||||||||
1969 | 22.00 | 19.57 | 18.35 | 32.53 | 38.87 | 45.67 | 54.32 | 52.77 | 46.33 | 33.39 | c | 24.45 | j | ----- | z | 36.38 | b | |||||||||
1970 | 16.46 | c | 21.88 | b | ----- | z | ----- | z | 46.20 | f | 48.87 | 54.10 | a | 54.52 | 47.00 | 33.29 | 28.83 | 23.00 | b | 36.44 | c | |||||
1971 | 19.00 | a | 20.82 | 28.84 | 31.93 | 41.45 | 50.50 | 55.68 | 51.90 | 47.17 | 36.48 | 27.40 | 19.23 | 35.87 | ||||||||||||
1972 | 20.90 | 25.72 | 33.39 | 37.73 | 40.83 | a | 50.25 | b | 54.90 | a | 52.45 | 48.23 | 41.00 | 24.57 | 20.10 | 37.51 | ||||||||||
1973 | 16.84 | 21.39 | 26.23 | 29.53 | 40.94 | 50.07 | 53.61 | 53.45 | 46.53 | 39.23 | 32.03 | 21.19 | 35.92 | |||||||||||||
1974 | 19.58 | 19.75 | 33.39 | 33.13 | 44.52 | 52.10 | 54.37 | a | 51.90 | 46.50 | 40.48 | 27.17 | a | 18.23 | 36.76 | |||||||||||
1975 | 18.00 | 22.32 | 27.74 | 32.27 | 38.93 | b | 49.30 | 52.84 | 53.31 | b | 47.03 | 38.60 | a | 27.10 | 21.45 | 35.74 | ||||||||||
1976 | 17.39 | 28.17 | 27.16 | 34.53 | 42.00 | 50.57 | 52.87 | a | 52.29 | 47.33 | 33.32 | 22.76 | a | 17.06 | 35.45 | |||||||||||
1977 | 15.68 | 22.32 | 25.55 | 34.80 | 42.87 | 53.13 | 54.87 | 56.42 | 50.60 | 40.30 | a | 30.10 | 28.32 | 37.91 | ||||||||||||
1978 | 22.94 | 23.36 | 31.13 | 36.63 | 42.00 | 52.90 | 56.97 | 52.04 | f | 47.80 | 39.23 | 30.90 | a | 18.30 | a | 36.56 | a | |||||||||
1979 | 15.61 | 21.56 | a | 27.84 | 34.20 | 40.97 | 50.67 | 55.03 | 52.41 | b | 49.87 | 38.85 | e | 23.70 | 20.97 | a | 35.97 | |||||||||
1980 | 24.97 | 25.66 | 26.61 | 31.03 | 40.16 | 53.12 | f | 57.58 | 54.32 | 49.37 | 34.77 | 27.73 | 27.63 | a | 36.35 | a | ||||||||||
1981 | 22.68 | 25.39 | 28.00 | 38.07 | 42.42 | 52.90 | 56.45 | 53.03 | 49.67 | 39.77 | 31.93 | 25.93 | a | 38.85 | ||||||||||||
1982 | 21.93 | a | 21.25 | 29.58 | 34.83 | 41.81 | 50.50 | 56.47 | a | 54.45 | 49.77 | 35.97 | 29.10 | a | 21.30 | h | 38.70 | a | ||||||||
1983 | 20.73 | a | 22.93 | 29.90 | a | 30.17 | a | 39.26 | 49.00 | 54.43 | a | 55.71 | 50.92 | f | ----- | z | 19.81 | n | 21.29 | c | 35.94 | c | ||||
1984 | 16.40 | a | 20.11 | a | 25.61 | c | 30.19 | c | 44.90 | 51.63 | 57.00 | 54.19 | 52.84 | k | ----- | z | ----- | z | ----- | z | 37.50 | d | ||||
1985 | ----- | z | ----- | z | 27.68 | 33.43 | 41.15 | d | 46.93 | 51.13 | 51.61 | 42.47 | 35.17 | a | 27.79 | a | 17.81 | 37.52 | b | |||||||
1986 | 21.00 | 24.63 | a | 27.68 | 35.37 | 39.39 | 47.37 | 50.65 | 51.00 | 43.07 | 32.67 | a | 25.20 | 18.13 | 34.68 | |||||||||||
1987 | 14.23 | a | 19.36 | 23.45 | 32.71 | p | 39.14 | b | 44.23 | 49.32 | 50.35 | 41.87 | 34.97 | 24.17 | 16.16 | 32.48 | a | |||||||||
1988 | 12.94 | 22.14 | 23.23 | 30.90 | a | 38.29 | 47.34 | a | 51.39 | 52.97 | 42.07 | 35.45 | 25.90 | 15.61 | 33.18 | |||||||||||
1989 | 15.26 | 21.50 | 27.83 | a | 35.40 | 41.68 | 48.00 | 50.97 | a | 49.97 | 44.03 | 32.93 | a | 24.43 | 14.58 | 33.88 | ||||||||||
1990 | 13.27 | a | 18.18 | 27.29 | 34.17 | 38.32 | 48.60 | 51.23 | a | 48.52 | 46.27 | 33.42 | 24.79 | a | 13.71 | 33.15 | ||||||||||
1991 | 15.10 | a | 21.39 | 25.87 | 30.80 | 38.29 | 43.60 | 50.74 | 50.61 | 44.40 | 32.68 | 23.22 | c | 18.23 | 32.91 | |||||||||||
1992 | 13.06 | 23.41 | 27.29 | 33.30 | 40.20 | a | 45.00 | c | 51.06 | 49.74 | 44.45 | a | 36.10 | a | 19.14 | a | 13.33 | a | 33.01 | |||||||
1993 | 21.39 | c | 24.92 | b | 25.83 | a | 33.40 | 38.28 | b | 46.97 | a | 52.23 | a | 52.03 | a | 42.07 | b | 31.89 | d | 21.66 | a | 17.23 | 33.99 | |||
1994 | 16.50 | c | 19.54 | 26.10 | a | 32.20 | 38.16 | 48.93 | c | 51.30 | a | 52.48 | 44.27 | 32.45 | 24.30 | 21.27 | a | 33.96 | ||||||||
1995 | 18.00 | 26.21 | ----- | z | 29.79 | b | 37.54 | g | 43.48 | a | 49.32 | 53.13 | 45.17 | a | 32.40 | a | 26.17 | a | 20.29 | 34.40 | b | |||||
1996 | 19.77 | a | 24.68 | a | 23.34 | b | 30.92 | d | 42.32 | 49.24 | a | 53.89 | c | 51.69 | b | 42.21 | b | 33.69 | b | 24.97 | 21.04 | d | 34.81 | |||
1997 | 17.11 | d | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 51.67 | d | 48.19 | d | 33.57 | c | 23.15 | d | 12.82 | c | 31.09 | f |
1998 | 19.59 | b | 20.52 | c | 23.52 | f | 30.71 | f | 38.50 | m | 48.78 | c | 53.41 | b | 51.19 | e | 47.24 | e | 36.08 | e | 27.37 | c | 18.71 | c | 35.88 | c |
1999 | 23.10 | a | 22.29 | d | 27.40 | f | 29.15 | d | 39.71 | c | 40.20 | e | 47.31 | e | 44.64 | c | 37.05 | j | 25.89 | d | 19.96 | b | 9.72 | f | 32.47 | c |
2000 | 13.86 | j | 19.96 | d | 21.26 | h | 24.88 | m | 42.55 | k | 48.96 | g | 51.87 | h | 50.57 | j | 46.37 | k | 35.81 | j | 19.53 | 18.04 | g | 19.75 | j | |
2001 | 12.97 | b | 21.17 | e | 27.05 | i | 33.40 | j | 40.20 | f | 47.40 | j | 52.74 | l | ----- | z | 43.47 | k | 37.26 | l | 25.47 | m | 20.00 | y | 17.07 | j |
2002 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2003 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2004 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2005 | ----- | z | ----- | z | 28.72 | b | 34.86 | a | 46.00 | a | 53.20 | 58.69 | b | 55.90 | a | 52.83 | 39.71 | 31.70 | 22.52 | 42.41 | b | |||||
2006 | 23.30 | k | 23.69 | l | 32.71 | n | 40.10 | 49.77 | 57.37 | 57.97 | 55.71 | 46.48 | e | 40.15 | d | 31.25 | n | 22.92 | s | 49.65 | e | |||||
2007 | 17.77 | i | 17.33 | y | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2008 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 56.76 | n | 54.84 | 48.43 | 38.31 | b | 30.85 | d | 28.00 | w | 43.11 | h | ||
2009 | 23.61 | 26.39 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 25.00 | j | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 17.63 | 21.38 | 26.13 | 32.61 | 40.37 | 48.30 | 53.36 | 51.98 | 45.98 | 35.59 | 25.73 | 18.90 | 35.09 | |||||||||||||
S.D. | 3.87 | 3.65 | 2.95 | 3.14 | 3.00 | 3.39 | 2.87 | 2.44 | 3.36 | 3.38 | 3.64 | 3.82 | 2.08 | |||||||||||||
SKEW | 0.20 | -0.38 | 0.11 | 0.10 | 0.61 | 0.08 | -0.04 | -0.27 | 0.07 | 0.34 | -0.08 | 0.29 | 0.33 | |||||||||||||
MAX | 24.97 | 29.00 | 33.39 | 40.10 | 49.77 | 57.37 | 59.97 | 57.30 | 52.83 | 44.97 | 32.03 | 28.32 | 38.85 | |||||||||||||
MIN | 10.43 | 11.82 | 18.35 | 24.93 | 34.07 | 40.20 | 46.55 | 44.64 | 39.40 | 25.89 | 18.67 | 11.93 | 31.69 | |||||||||||||
YRS | 59 | 54 | 49 | 54 | 56 | 59 | 58 | 56 | 54 | 56 | 54 | 47 | 26 |