YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1907 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 53.35 | 47.52 | e | 41.18 | f | 50.44 | j | |
1908 | 40.06 | 40.16 | 43.52 | 48.82 | 51.90 | 58.60 | a | 67.58 | 65.56 | g | 58.67 | a | 51.18 | 48.59 | h | 40.08 | k | 51.17 | c | |||||||
1909 | 32.15 | r | 41.37 | a | 44.79 | 48.15 | 53.03 | 60.52 | 62.23 | a | 62.47 | a | 61.39 | b | 52.21 | b | 45.20 | 36.55 | 51.63 | a | ||||||
1910 | 37.37 | 36.61 | 47.08 | e | 49.73 | 57.00 | a | 57.93 | 63.78 | d | 61.85 | 57.98 | a | 52.28 | a | 44.72 | a | 41.63 | a | 50.66 | ||||||
1911 | 36.85 | 38.57 | 44.87 | 46.38 | 52.84 | 58.14 | a | 64.78 | d | 63.06 | 56.56 | c | 51.37 | 43.40 | 40.53 | 49.78 | ||||||||||
1912 | 40.68 | 42.10 | 43.44 | 48.32 | 56.55 | c | 60.19 | a | 64.13 | 63.34 | 59.00 | 48.66 | 44.58 | 40.27 | a | 50.94 | ||||||||||
1913 | 35.52 | 38.86 | 41.47 | 48.33 | 53.43 | a | 60.35 | 64.27 | 66.44 | 59.50 | 49.69 | 44.23 | 41.19 | 50.27 | ||||||||||||
1914 | 41.33 | a | 42.04 | a | 47.56 | 51.78 | 58.19 | 60.77 | 66.32 | 65.21 | 57.86 | a | 54.94 | 46.24 | a | 38.65 | 52.57 | |||||||||
1915 | 39.19 | 44.02 | 49.74 | 53.52 | 56.58 | 61.10 | 65.68 | a | 68.43 | a | 60.30 | 54.26 | 43.13 | 40.71 | 53.06 | |||||||||||
1916 | 31.90 | 40.38 | 44.24 | 49.88 | 53.16 | 62.58 | 62.79 | 65.56 | 60.57 | 49.00 | 42.28 | 37.55 | 49.99 | |||||||||||||
1917 | 37.35 | 39.61 | 41.52 | a | 47.28 | 54.00 | 58.88 | 65.76 | 67.37 | 59.88 | 53.08 | 48.82 | 43.97 | 51.46 | ||||||||||||
1918 | 43.44 | 39.91 | 44.52 | 50.52 | 54.61 | 63.70 | 65.87 | 65.89 | 63.48 | a | 53.97 | 45.37 | 40.55 | 52.65 | ||||||||||||
1919 | 40.41 | b | 41.20 | 40.89 | l | 51.48 | 54.67 | a | 58.97 | 65.74 | 65.48 | 60.80 | 49.27 | 44.53 | 38.02 | a | 51.87 | a | ||||||||
1920 | 39.95 | 41.57 | 44.58 | 47.58 | 52.42 | 59.95 | 65.55 | 66.61 | 58.72 | 49.66 | b | 45.95 | 41.69 | 51.19 | ||||||||||||
1921 | 39.31 | 42.79 | 45.47 | 48.47 | 54.24 | 61.02 | 62.53 | 63.85 | 57.28 | 53.06 | 45.05 | a | 38.68 | 50.98 | ||||||||||||
1922 | 35.94 | 38.91 | 41.53 | 47.28 | a | 54.97 | 62.83 | a | 64.29 | 64.52 | 59.78 | 53.27 | 42.95 | 37.94 | 50.35 | |||||||||||
1923 | 40.02 | 37.56 | b | 43.97 | a | 51.70 | 55.19 | 61.42 | 67.07 | b | 70.50 | b | 60.66 | e | 53.77 | 46.40 | 41.52 | a | 52.48 | |||||||
1924 | 39.93 | a | 44.95 | 45.15 | a | 49.72 | 58.60 | 62.23 | 64.69 | 64.55 | 59.50 | 52.40 | a | 43.50 | 37.82 | 51.92 | ||||||||||
1925 | 41.02 | 44.50 | 45.94 | 51.20 | 58.97 | 60.77 | 66.58 | 63.73 | 60.84 | a | 51.05 | a | 44.93 | 44.71 | 52.85 | |||||||||||
1926 | 41.45 | a | 45.93 | 49.76 | b | 56.03 | 56.55 | 63.48 | 67.31 | 65.10 | b | 58.28 | 54.24 | 47.87 | 40.71 | 53.89 | ||||||||||
1927 | 39.94 | 41.91 | 43.50 | a | 49.03 | 52.68 | c | 62.17 | 65.88 | n | 65.85 | 59.17 | 52.85 | 45.13 | 36.90 | a | 49.92 | a | ||||||||
1928 | 40.32 | 42.21 | 46.88 | a | 48.62 | 58.28 | a | ----- | z | 65.55 | a | 64.48 | 58.65 | 51.47 | a | 46.17 | a | 39.98 | 51.15 | a | ||||||
1929 | 34.76 | 35.31 | a | 45.53 | 47.15 | 55.11 | 60.07 | 64.89 | 65.68 | 60.57 | 54.42 | 46.81 | v | 42.66 | 51.47 | a | ||||||||||
1930 | 32.31 | 42.54 | 46.00 | d | 52.17 | a | 53.87 | a | 58.41 | b | 63.42 | a | 65.88 | c | 60.32 | b | 49.92 | 44.06 | e | 40.79 | 50.81 | |||||
1931 | 43.13 | a | 42.80 | a | 46.21 | 50.98 | 58.45 | a | 59.78 | 64.97 | 64.52 | 59.62 | a | 51.32 | a | 41.90 | 38.87 | a | 51.88 | |||||||
1932 | 38.00 | 40.64 | 45.27 | 50.33 | 54.68 | 61.75 | 61.13 | 63.74 | 59.62 | 53.88 | a | 47.50 | 38.00 | 51.21 | ||||||||||||
1933 | 37.85 | 37.15 | b | 43.37 | a | 48.67 | 52.11 | 58.67 | 62.66 | 65.89 | 57.17 | a | 52.15 | 46.05 | 43.52 | 50.44 | ||||||||||
1934 | 43.77 | a | 45.48 | 49.71 | 55.52 | 57.55 | 61.20 | 63.05 | 65.47 | 58.55 | 53.66 | 47.37 | 41.95 | a | 53.61 | |||||||||||
1935 | 38.56 | 42.05 | 41.44 | 48.93 | 55.82 | 61.43 | 64.73 | 64.08 | 61.63 | 50.38 | a | 42.53 | 42.82 | a | 51.20 | |||||||||||
1936 | 42.47 | 35.83 | 43.61 | 53.07 | 58.02 | 62.38 | 64.56 | 67.48 | 59.33 | 54.82 | 44.67 | 43.34 | 52.47 | |||||||||||||
1937 | 31.73 | 39.84 | 47.32 | 47.93 | a | 55.34 | 61.55 | 64.60 | 63.76 | 60.02 | 54.44 | 46.72 | 42.97 | 51.35 | ||||||||||||
1938 | 40.77 | 41.79 | 44.21 | 51.63 | 56.98 | 61.82 | 66.06 | 62.97 | 63.30 | 52.23 | 43.92 | 42.31 | 52.33 | |||||||||||||
1939 | 42.77 | 39.54 | 45.27 | 52.92 | 56.74 | 59.65 | 65.05 | 65.53 | 59.90 | 53.23 | 48.16 | a | 45.55 | 52.86 | ||||||||||||
1940 | 43.16 | 44.96 | a | 48.84 | 53.38 | 59.44 | 63.60 | a | 65.94 | 66.35 | 63.82 | 56.13 | 43.23 | 44.58 | 54.45 | |||||||||||
1941 | 42.94 | 45.52 | 52.13 | a | 54.63 | 57.05 | 61.62 | 69.13 | a | 65.95 | 59.17 | 53.85 | 47.95 | a | 42.87 | a | 54.40 | |||||||||
1942 | 39.55 | a | 42.57 | 45.45 | 52.70 | 56.53 | 60.18 | 66.79 | 67.66 | 61.48 | 54.72 | a | 43.55 | 42.89 | 52.84 | |||||||||||
1943 | 35.03 | a | 42.41 | a | 44.10 | 52.10 | 54.58 | 59.25 | 64.41 | b | 63.74 | 62.30 | 53.24 | 46.05 | 40.93 | a | 51.51 | |||||||||
1944 | 40.75 | a | 42.36 | a | 44.57 | b | 50.53 | 55.45 | 60.27 | 65.00 | 64.77 | 62.25 | 55.29 | 45.92 | 39.75 | a | 52.24 | |||||||||
1945 | 42.44 | 42.73 | 44.60 | 48.33 | 57.78 | a | 60.10 | 65.67 | e | 64.70 | c | 58.11 | b | 53.23 | a | 44.75 | 41.31 | 51.98 | ||||||||
1946 | 41.08 | 42.21 | b | 44.59 | b | 49.60 | 59.05 | b | 59.47 | 64.90 | 64.80 | a | 59.83 | a | 49.66 | 42.12 | a | 41.26 | b | 51.55 | ||||||
1947 | 38.18 | c | 44.36 | 48.72 | a | 52.31 | a | 59.15 | 60.53 | a | 64.05 | 63.74 | 60.65 | ----- | z | ----- | z | ----- | z | 54.63 | c | |||||
1948 | 41.39 | 40.80 | a | 44.10 | 47.07 | a | 54.66 | b | 63.40 | 63.77 | 62.43 | a | 58.48 | 51.76 | 44.03 | 37.26 | 50.76 | |||||||||
1949 | 31.87 | 37.88 | 46.18 | 51.32 | 58.53 | 59.83 | 63.87 | 65.35 | 62.33 | c | 49.73 | 49.40 | 40.60 | 51.41 | ||||||||||||
1950 | 28.43 | a | 40.29 | 43.50 | 47.58 | 53.66 | 61.93 | 65.16 | 66.21 | 60.50 | 51.34 | 45.37 | 46.02 | 50.83 | ||||||||||||
1951 | 39.24 | 41.66 | 41.76 | 52.48 | 57.15 | 62.70 | 66.23 | 64.68 | 60.65 | 52.74 | 45.75 | 38.29 | 51.94 | |||||||||||||
1952 | 37.56 | 42.29 | 44.06 | 50.22 | 56.76 | b | 58.28 | 64.66 | 64.58 | f | 62.30 | 55.85 | 43.52 | 42.26 | 50.71 | a | ||||||||||
1953 | 45.61 | 42.70 | 45.02 | 49.52 | 55.08 | 58.03 | 64.61 | 64.98 | 60.63 | 53.55 | 47.77 | 43.40 | 52.58 | |||||||||||||
1954 | 38.34 | c | 43.07 | 43.29 | 48.12 | 55.90 | 57.45 | 60.85 | a | 61.90 | 60.03 | 51.29 | 49.90 | 41.95 | 51.01 | |||||||||||
1955 | 40.67 | b | 40.29 | 41.44 | 45.75 | 53.10 | 59.95 | a | 61.55 | a | 63.48 | b | 58.77 | b | 51.84 | 39.64 | a | 40.03 | 49.71 | |||||||
1956 | 40.02 | 37.36 | a | 42.53 | 51.28 | a | 58.95 | 58.43 | 65.55 | 65.37 | 59.21 | a | 51.06 | 43.35 | 41.90 | a | 51.25 | |||||||||
1957 | 35.18 | 40.65 | a | 45.63 | 52.10 | 59.16 | 61.67 | a | 63.27 | 63.37 | 63.86 | a | 52.42 | 44.45 | 44.39 | 52.18 | ||||||||||
1958 | 43.45 | 47.67 | a | 45.35 | 50.57 | 60.93 | b | 65.52 | 70.10 | 68.16 | 60.57 | 53.89 | 45.23 | 45.90 | 54.78 | |||||||||||
1959 | 41.05 | a | 41.69 | a | 45.13 | a | 50.62 | 54.61 | 60.98 | 66.17 | a | 63.68 | a | 58.66 | a | 52.40 | a | 44.83 | c | 41.42 | a | 51.77 | ||||
1960 | 39.18 | 42.40 | 45.00 | a | 50.63 | 54.48 | 60.47 | 67.00 | b | 63.45 | 59.34 | a | 53.43 | b | 45.27 | 41.11 | 51.81 | |||||||||
1961 | 43.81 | 45.23 | 46.16 | 49.28 | 56.10 | 63.65 | 66.82 | 68.77 | c | 58.81 | a | 50.89 | 43.38 | b | 41.02 | a | 52.83 | |||||||||
1962 | 39.27 | 43.54 | a | 43.26 | 52.29 | a | 52.88 | a | 59.70 | b | 63.35 | a | 63.73 | a | 60.48 | a | 53.13 | 46.97 | a | 43.98 | 51.88 | |||||
1963 | 37.39 | 47.89 | 44.37 | 50.28 | 56.52 | 59.73 | 62.98 | 65.06 | 64.07 | a | 55.05 | a | 46.25 | 42.65 | 52.69 | |||||||||||
1964 | 41.87 | 41.78 | 45.15 | 48.03 | 53.87 | 59.42 | 63.31 | 62.77 | 58.52 | 52.42 | a | 42.77 | b | 37.47 | a | 50.61 | ||||||||||
1965 | 40.56 | 42.76 | a | 45.63 | 50.98 | 53.58 | 61.10 | 66.15 | 66.11 | 58.40 | 54.50 | 48.53 | 40.58 | a | 52.41 | |||||||||||
1966 | 41.05 | 42.66 | 45.90 | ----- | z | 56.15 | 59.03 | 63.45 | 65.23 | 62.05 | 51.97 | 46.72 | 44.68 | a | 52.63 | a | ||||||||||
1967 | 42.37 | 43.77 | 43.02 | 47.28 | 56.03 | 63.88 | 66.15 | 69.79 | 64.37 | 53.76 | 47.27 | b | 42.00 | 53.31 | ||||||||||||
1968 | 41.34 | 45.62 | 48.70 | a | 49.07 | a | 56.42 | 59.88 | 66.97 | a | 62.71 | 59.47 | 51.15 | 46.97 | 37.83 | a | 52.18 | |||||||||
1969 | 32.91 | c | 40.33 | a | 46.50 | c | 49.18 | 58.27 | 64.55 | 63.70 | a | 62.74 | 59.59 | a | 50.52 | a | 46.18 | 44.15 | 51.55 | |||||||
1970 | 40.26 | 45.02 | a | 46.26 | 48.16 | a | 55.29 | 63.31 | a | 65.05 | 64.63 | a | 57.38 | 50.52 | 45.27 | 39.41 | b | 51.71 | ||||||||
1971 | 39.20 | a | ----- | z | ----- | z | 47.32 | 54.56 | 55.58 | 63.45 | 65.79 | 56.87 | 48.87 | 43.93 | 36.02 | 51.16 | b | |||||||||
1972 | 34.92 | 40.57 | 45.47 | a | 45.33 | 56.95 | 59.50 | 63.97 | 64.92 | 56.48 | 48.97 | 44.62 | 37.02 | 49.89 | ||||||||||||
1973 | 37.94 | 42.43 | 44.69 | 48.83 | 55.68 | 59.25 | 64.10 | 61.29 | 60.12 | 51.52 | a | 41.42 | 42.53 | 50.82 | ||||||||||||
1974 | 38.13 | 41.83 | b | 44.56 | 49.33 | 52.65 | 59.93 | 62.11 | 64.77 | 62.65 | 51.56 | 45.78 | 41.52 | 51.24 | ||||||||||||
1975 | 39.05 | 40.02 | 43.19 | 45.65 | 54.45 | 58.55 | 64.60 | a | 61.79 | 59.52 | 50.69 | 43.87 | 40.65 | 50.17 | ||||||||||||
1976 | 41.05 | 40.76 | 41.10 | 48.50 | a | 53.82 | 57.20 | 62.50 | 61.50 | 59.97 | 52.30 | a | 44.70 | b | 41.78 | a | 50.43 | |||||||||
1977 | 37.39 | 44.62 | 42.90 | a | 50.27 | 52.77 | 60.77 | 61.56 | 66.92 | 56.70 | 50.35 | a | 42.23 | 40.44 | 50.58 | |||||||||||
1978 | 41.89 | 44.07 | 46.85 | 48.36 | a | 53.15 | 61.78 | 63.77 | 62.89 | 56.82 | 51.84 | 39.55 | 36.26 | 50.60 | ||||||||||||
1979 | 35.34 | 40.20 | 47.15 | 49.28 | 55.68 | 60.08 | 64.77 | 63.55 | 60.50 | a | 52.47 | a | 42.63 | 43.15 | 51.23 | |||||||||||
1980 | 35.33 | a | 42.57 | 43.95 | b | 51.09 | b | 55.85 | 57.08 | 63.40 | 61.95 | 58.82 | 52.84 | 45.83 | 43.53 | a | 51.02 | |||||||||
1981 | 41.50 | a | 42.88 | 46.87 | 48.67 | a | 53.79 | 56.70 | 61.92 | 66.03 | 58.63 | 48.95 | a | 45.83 | 40.81 | 51.05 | ||||||||||
1982 | 39.10 | b | 40.89 | 42.93 | a | 45.93 | b | 53.72 | b | 61.78 | e | 61.46 | f | 62.66 | f | 58.68 | b | 49.98 | d | 41.30 | 39.14 | b | 47.35 | b | ||
1983 | 42.17 | a | 44.80 | 46.66 | 48.80 | c | 56.28 | d | 57.44 | e | 60.85 | g | 63.25 | e | 55.68 | e | 49.44 | 45.47 | 35.19 | 49.56 | a | |||||
1984 | 41.79 | 42.45 | a | 46.73 | 48.92 | 53.54 | c | 59.48 | c | 63.60 | 64.03 | b | 59.65 | 50.35 | a | 44.93 | a | 37.69 | b | 51.10 | ||||||
1985 | 37.59 | c | 39.89 | a | 43.62 | a | 49.86 | a | 55.20 | a | 59.72 | 67.14 | b | 64.44 | f | 58.82 | 52.12 | c | 37.15 | 37.33 | a | 48.95 | a | |||
1986 | 43.22 | b | 42.22 | c | 49.47 | a | 47.82 | 55.76 | 62.32 | 60.98 | a | 67.63 | a | 58.64 | a | 53.62 | a | 44.98 | a | 42.43 | a | 52.42 | ||||
1987 | 40.33 | b | 45.15 | a | 47.70 | a | 51.75 | 56.77 | 61.33 | a | 62.87 | a | 65.02 | 61.53 | a | 54.61 | 48.05 | a | 40.05 | a | 52.93 | |||||
1988 | 39.38 | b | 44.26 | 45.65 | 50.20 | 55.25 | a | 58.77 | 63.50 | 63.82 | 59.29 | a | 54.92 | 45.67 | a | 41.88 | a | 51.88 | ||||||||
1989 | 41.32 | a | 37.28 | a | 43.10 | 52.17 | 55.72 | a | 61.32 | 62.35 | 63.43 | a | 61.38 | a | 52.61 | 46.85 | 43.73 | 51.77 | ||||||||
1990 | 42.15 | 39.77 | 47.02 | 51.57 | a | 54.76 | 59.97 | 66.97 | b | 66.21 | 62.76 | a | 50.74 | 46.20 | 35.65 | a | 51.98 | |||||||||
1991 | 40.15 | a | 46.54 | a | 44.00 | a | 48.93 | c | 54.60 | 57.66 | a | 65.43 | b | 65.66 | b | 61.40 | a | 51.70 | a | 46.80 | 43.06 | 52.16 | ||||
1992 | 43.55 | b | 45.62 | 49.56 | 52.17 | a | 59.05 | a | 63.36 | a | 65.23 | a | 65.77 | 59.52 | 53.55 | a | 46.20 | b | 39.05 | c | 53.55 | |||||
1993 | 37.62 | a | 41.28 | a | 47.40 | a | 50.43 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 44.18 | h |
1994 | ----- | z | 39.46 | 47.45 | 51.37 | 56.19 | 58.82 | 65.02 | a | 66.03 | 62.60 | 51.90 | 42.05 | a | 40.68 | a | 52.87 | a | ||||||||
1995 | 44.02 | 44.69 | a | ----- | z | ----- | z | 57.35 | 60.38 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 51.61 | h | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 39.40 | 41.92 | 45.25 | 49.90 | 55.67 | 60.45 | 64.62 | 64.85 | 59.91 | 52.24 | 44.99 | 40.88 | 51.75 | |||||||||||||
S.D. | 3.24 | 2.59 | 2.22 | 2.19 | 2.02 | 1.93 | 1.79 | 1.85 | 1.87 | 1.81 | 2.23 | 2.54 | 1.13 | |||||||||||||
SKEW | -0.93 | -0.18 | 0.50 | 0.31 | 0.28 | 0.14 | 0.23 | 0.51 | 0.30 | -0.09 | -0.60 | -0.22 | 0.49 | |||||||||||||
MAX | 45.61 | 47.89 | 52.13 | 56.03 | 60.93 | 65.52 | 70.10 | 70.50 | 64.37 | 56.13 | 49.90 | 46.02 | 54.78 | |||||||||||||
MIN | 28.43 | 35.31 | 41.10 | 45.33 | 51.90 | 55.58 | 60.85 | 61.29 | 55.68 | 48.66 | 37.15 | 35.19 | 49.71 | |||||||||||||
YRS | 86 | 87 | 85 | 86 | 87 | 86 | 83 | 82 | 86 | 86 | 84 | 84 | 72 |