YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1907 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 56.03 | a | 56.00 | e | ----- | z | ----- | z | 56.02 | j |
1908 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1909 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1910 | 25.72 | b | 27.96 | 40.37 | a | 45.40 | 48.35 | 50.69 | a | 58.39 | 52.42 | 43.83 | 41.76 | b | 36.24 | a | 34.03 | a | 42.10 | |||||||
1911 | 29.74 | 29.68 | 37.47 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 33.23 | d | 32.42 | 32.51 | g | |||
1912 | 27.83 | b | 35.85 | b | 33.19 | 40.60 | 45.94 | 55.87 | 54.61 | 55.45 | 50.67 | 42.16 | 37.13 | 31.65 | 42.58 | |||||||||||
1913 | 27.68 | c | 27.38 | b | 33.83 | a | 38.20 | 41.97 | 50.83 | 54.73 | a | 54.71 | 44.83 | 41.81 | e | 37.71 | b | 29.14 | c | 40.24 | ||||||
1914 | 34.33 | g | 31.25 | d | 34.59 | d | 37.54 | d | 42.81 | d | 47.28 | a | 52.85 | e | 53.93 | a | 44.38 | a | 41.24 | b | 32.96 | c | 20.10 | 39.90 | a | |
1915 | 24.80 | a | 32.56 | a | 35.68 | 38.70 | 43.37 | a | 48.97 | 55.67 | a | 57.50 | a | 50.00 | 39.90 | 33.13 | 29.37 | a | 40.80 | |||||||
1916 | 13.68 | 28.21 | 33.48 | 37.59 | a | 39.03 | 47.47 | 47.39 | 54.23 | 46.47 | 33.68 | 26.13 | 25.37 | a | 36.06 | |||||||||||
1917 | 25.17 | a | 30.52 | a | 27.55 | 35.93 | 41.77 | 47.00 | 54.58 | 55.13 | 48.90 | 38.94 | 34.57 | 35.87 | a | 39.66 | ||||||||||
1918 | 32.29 | 26.39 | 33.19 | 35.63 | 40.48 | 51.33 | 52.61 | 53.35 | 49.17 | 40.90 | 32.57 | 28.39 | 39.69 | |||||||||||||
1919 | 22.28 | b | ----- | z | 35.44 | v | 36.90 | 41.16 | 46.27 | 52.94 | 52.16 | 43.97 | 33.65 | 30.93 | 17.37 | d | 37.76 | b | ||||||||
1920 | 25.16 | 27.79 | 31.35 | 33.63 | 38.32 | 46.63 | 54.81 | 52.16 | 45.80 | 39.68 | 29.83 | 31.03 | a | 38.02 | ||||||||||||
1921 | 27.61 | 31.41 | a | 34.29 | 35.14 | a | 41.90 | 51.50 | 52.48 | 53.13 | 43.33 | 38.35 | 31.03 | 23.55 | 38.64 | |||||||||||
1922 | 16.90 | a | 24.96 | a | 31.00 | 34.17 | a | 40.68 | 51.50 | 55.52 | 54.74 | 47.38 | a | 40.10 | a | 30.87 | 21.43 | a | 37.44 | |||||||
1923 | 30.24 | b | 22.14 | 32.06 | 36.90 | 42.71 | 48.07 | 56.29 | 54.55 | 46.53 | 38.35 | 33.48 | a | 25.93 | b | 38.94 | ||||||||||
1924 | 21.32 | c | 32.14 | 31.29 | 36.00 | 44.58 | 50.23 | 54.06 | 52.97 | 45.43 | 39.03 | a | 32.11 | b | ----- | z | 39.92 | a | ||||||||
1925 | ----- | z | ----- | z | 33.32 | f | 39.23 | 46.03 | 50.23 | 58.30 | a | 53.45 | 49.23 | 39.55 | 31.37 | 32.84 | 44.47 | c | ||||||||
1926 | 30.32 | 34.32 | 34.57 | a | 40.83 | 42.48 | 51.93 | 56.65 | 53.32 | 42.96 | c | 40.96 | g | 32.46 | b | 27.44 | o | 41.99 | b | |||||||
1927 | 20.53 | a | 30.65 | h | 32.53 | a | 34.31 | a | 41.48 | 51.07 | b | 54.97 | 55.03 | 46.43 | 40.87 | a | 37.82 | b | 21.22 | d | 39.66 | a | ||||
1928 | 23.77 | a | 28.61 | a | 35.58 | 35.43 | b | 43.83 | a | 50.57 | 57.35 | 53.65 | 47.77 | 39.10 | a | 33.77 | 25.35 | 39.56 | ||||||||
1929 | 17.00 | 17.33 | d | 34.55 | 35.37 | 42.80 | a | 49.38 | a | 53.68 | 54.90 | 45.72 | a | 39.26 | 26.70 | 30.90 | 37.30 | |||||||||
1930 | 6.94 | 32.86 | g | 34.35 | 39.57 | 40.57 | a | 46.07 | 54.57 | a | 56.16 | 48.36 | b | 35.90 | 30.79 | a | 27.07 | d | 38.21 | a | ||||||
1931 | 28.55 | 28.48 | a | 32.74 | 36.11 | c | 44.60 | a | 49.33 | 54.39 | 51.97 | 45.93 | 35.83 | b | 26.83 | 20.37 | a | 37.93 | ||||||||
1932 | 23.73 | a | 24.03 | 34.32 | 38.03 | 43.03 | 50.41 | a | 52.42 | 53.61 | 45.07 | 40.59 | b | 36.13 | 21.77 | 38.60 | ||||||||||
1933 | 26.48 | 24.54 | b | 33.93 | a | 36.30 | 40.30 | a | 49.10 | 54.65 | 54.71 | 42.77 | 39.43 | a | 33.97 | a | 33.75 | c | 39.16 | |||||||
1934 | 33.87 | 32.50 | b | 36.92 | e | 41.55 | a | 45.52 | 50.23 | 53.23 | 54.47 | a | 45.30 | 41.14 | c | 36.61 | b | 30.28 | b | 41.80 | ||||||
1935 | 27.96 | g | 29.85 | b | 30.27 | a | 32.87 | 39.53 | a | 48.24 | a | 54.83 | a | 52.84 | 49.31 | a | 37.13 | 27.39 | b | 28.48 | b | 39.16 | a | |||
1936 | 29.90 | 16.04 | b | 32.35 | 41.63 | 46.00 | 51.40 | 54.94 | 54.52 | 45.57 | 40.86 | b | 24.13 | 31.13 | 39.04 | |||||||||||
1937 | 6.65 | 23.28 | c | 34.97 | 36.40 | 41.32 | 48.96 | d | 55.48 | 52.87 | 48.83 | 42.39 | 36.80 | 31.48 | b | 38.29 | ||||||||||
1938 | 29.16 | 29.43 | 33.42 | 38.30 | 42.87 | 50.33 | 57.16 | 51.16 | 51.20 | 39.97 | 29.93 | 28.67 | a | 40.13 | ||||||||||||
1939 | 30.94 | 27.43 | 34.73 | a | 38.00 | 44.68 | 48.57 | 55.63 | a | 54.10 | 47.97 | 39.61 | 29.80 | 31.58 | 40.25 | |||||||||||
1940 | 25.06 | 31.97 | 36.32 | 39.57 | 44.68 | 51.53 | 57.39 | 54.10 | 51.83 | 43.29 | 29.77 | 27.35 | 41.07 | |||||||||||||
1941 | 27.94 | 30.11 | 34.81 | 39.27 | 44.35 | 49.27 | 58.87 | 55.35 | 46.60 | 39.39 | 33.40 | 30.65 | 40.83 | |||||||||||||
1942 | 18.16 | 29.71 | 30.90 | 38.53 | 43.48 | 46.90 | 55.90 | 56.35 | 48.13 | 39.58 | 33.00 | 30.40 | a | 39.26 | ||||||||||||
1943 | 17.74 | 29.61 | 30.90 | 40.00 | 41.74 | 46.83 | 54.39 | 52.19 | 48.47 | 40.52 | 33.77 | 26.97 | 38.59 | |||||||||||||
1944 | 25.77 | 30.10 | 31.13 | 37.40 | 42.45 | 48.50 | 55.35 | 54.06 | 48.97 | 41.77 | 31.73 | 26.55 | 39.48 | |||||||||||||
1945 | 30.61 | 31.75 | 32.13 | 36.37 | 44.06 | 46.90 | 54.80 | a | 53.87 | 43.90 | 38.29 | 31.90 | 26.94 | 39.29 | ||||||||||||
1946 | 29.48 | 30.54 | 33.87 | 36.90 | 44.52 | 47.87 | 54.90 | 54.00 | a | 45.26 | c | 36.76 | b | 28.43 | 29.68 | 39.35 | ||||||||||
1947 | 21.87 | 30.61 | 34.39 | 38.90 | 46.60 | a | 48.53 | 53.50 | a | 52.42 | 48.90 | a | 43.23 | 35.87 | 31.39 | 40.52 | ||||||||||
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 51.35 | 52.81 | 45.30 | 36.16 | 32.10 | 23.97 | 40.28 | f | ||||||
1949 | 9.29 | 25.14 | 33.06 | 38.33 | 46.16 | 46.80 | 52.45 | 53.55 | 47.87 | 33.45 | 34.93 | 29.16 | 37.52 | |||||||||||||
1950 | 9.52 | 28.48 | c | 31.50 | a | 33.97 | 40.20 | a | 49.07 | 52.48 | 54.06 | 44.00 | 39.87 | 34.28 | a | 31.29 | 37.39 | |||||||||
1951 | 25.53 | a | 27.26 | a | 28.03 | 35.20 | 40.90 | 48.00 | 53.29 | 50.68 | 45.90 | 37.84 | 30.20 | 23.10 | b | 37.16 | ||||||||||
1952 | 17.77 | 27.75 | e | 29.94 | 32.30 | 40.68 | 48.37 | 51.52 | b | 51.68 | 43.33 | f | 37.43 | a | 22.79 | a | 28.60 | a | 35.35 | a | ||||||
1953 | 35.43 | c | 32.18 | 33.23 | 36.82 | b | 40.80 | a | 45.43 | b | 52.70 | a | 50.93 | d | 46.27 | h | 38.70 | a | 36.56 | e | 31.97 | 39.52 | a | |||
1954 | 25.20 | a | 31.18 | 28.38 | g | 33.00 | c | 42.75 | c | 43.54 | f | 49.09 | t | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 33.03 | h | |
1955 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1956 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1957 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1958 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1959 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1960 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1961 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1962 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1963 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1964 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1965 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1966 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1967 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1968 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1969 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1970 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1971 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1972 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1973 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1974 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1975 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1976 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1977 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1978 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1979 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1980 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1981 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1982 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1983 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1984 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1985 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1986 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1987 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1988 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1989 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1990 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1991 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1992 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1993 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1994 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1995 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1996 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1997 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1998 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1999 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2000 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2001 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2006 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2007 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2008 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2009 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2010 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2011 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2012 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2013 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2014 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2015 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 23.85 | 28.51 | 33.29 | 37.27 | 42.83 | 49.13 | 54.51 | 53.70 | 47.01 | 39.62 | 32.16 | 28.06 | 39.27 | |||||||||||||
S.D. | 7.16 | 4.03 | 2.43 | 2.65 | 2.25 | 2.06 | 2.13 | 1.45 | 2.72 | 3.50 | 3.56 | 4.28 | 1.53 | |||||||||||||
SKEW | -0.88 | -1.18 | 0.14 | 0.49 | 0.25 | 0.64 | -0.49 | 0.11 | 0.85 | 2.09 | -0.58 | -0.61 | 0.17 | |||||||||||||
MAX | 35.43 | 35.85 | 40.37 | 45.40 | 48.35 | 55.87 | 58.87 | 57.50 | 56.03 | 56.00 | 37.82 | 35.87 | 42.58 | |||||||||||||
MIN | 6.65 | 16.04 | 27.55 | 32.30 | 38.32 | 45.43 | 47.39 | 50.68 | 42.77 | 33.45 | 22.79 | 17.37 | 36.06 | |||||||||||||
YRS | 41 | 40 | 41 | 43 | 43 | 42 | 43 | 43 | 42 | 43 | 44 | 42 | 32 |