YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1909 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 56.39 | k | 54.44 | 54.44 | k | |
1910 | 53.42 | 54.29 | 57.19 | 60.28 | a | 60.94 | 61.35 | 65.69 | 65.44 | 66.72 | 64.71 | 59.13 | 57.85 | 60.58 | ||||||||||||
1911 | 56.56 | 53.41 | 58.08 | 57.55 | 59.26 | 60.82 | 64.27 | 65.65 | 64.92 | 63.50 | 62.40 | a | 55.87 | 60.19 | ||||||||||||
1912 | 56.85 | 57.29 | 54.90 | 55.53 | 59.32 | 61.67 | 64.16 | 65.32 | 65.03 | a | 64.10 | 61.38 | 55.79 | 60.11 | ||||||||||||
1913 | 52.06 | 53.43 | 55.92 | 56.42 | 59.66 | 62.15 | 65.90 | 67.02 | 69.08 | j | 65.60 | 61.27 | 55.53 | 59.54 | a | |||||||||||
1914 | 56.00 | 56.88 | 61.34 | 60.35 | 58.71 | 61.57 | 63.95 | a | 65.53 | 65.02 | 66.39 | 64.22 | 55.10 | 61.25 | ||||||||||||
1915 | 55.55 | 55.27 | 60.05 | 58.93 | 59.43 | b | 62.55 | 65.90 | 66.37 | 64.12 | a | 59.79 | ----- | z | ----- | z | 60.80 | b | ||||||||
1916 | 54.00 | v | 56.66 | 59.63 | 60.43 | 59.82 | a | 60.15 | 63.71 | 64.16 | b | 61.67 | 59.76 | 57.32 | 52.56 | 59.62 | a | |||||||||
1917 | 52.24 | 54.52 | 55.27 | e | 56.23 | 57.19 | 62.90 | a | 67.21 | 66.13 | 65.98 | 65.05 | 60.77 | 56.87 | 60.03 | |||||||||||
1918 | 53.74 | 53.77 | 56.44 | 57.75 | 57.81 | 63.60 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 57.18 | f | ||||||
1919 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 75.60 | 74.94 | 73.31 | c | 70.77 | c | 63.54 | q | 64.43 | b | 71.81 | g | ||
1920 | 63.45 | b | 60.96 | b | 62.12 | b | 63.10 | 65.13 | 66.00 | 67.11 | 70.58 | 68.80 | 65.69 | 61.80 | 56.53 | 64.27 | ||||||||||
1921 | 55.29 | b | 57.02 | 60.24 | 60.00 | b | 59.21 | 63.53 | 68.06 | 68.69 | 67.43 | a | 64.69 | 62.57 | 59.35 | 62.18 | ||||||||||
1922 | 54.24 | 55.00 | 56.79 | 59.02 | 61.19 | b | 64.27 | 66.39 | 68.97 | b | 69.27 | 64.75 | c | 61.47 | 58.45 | 61.65 | ||||||||||
1923 | 58.27 | 57.06 | b | 62.76 | b | 60.15 | 63.85 | a | 63.40 | 66.66 | 67.00 | 68.65 | 66.82 | c | 66.12 | 58.73 | 63.29 | |||||||||
1924 | 57.84 | 60.11 | b | 58.66 | 58.77 | b | 61.58 | 63.90 | 65.90 | 73.46 | e | 65.35 | 60.69 | 59.38 | 54.98 | 61.72 | ||||||||||
1925 | 53.69 | 55.43 | 56.65 | 57.83 | 61.50 | 64.40 | 69.11 | 67.31 | 64.83 | 62.77 | 59.92 | 58.48 | a | 60.99 | ||||||||||||
1926 | 56.13 | 57.30 | 61.02 | 61.50 | 61.87 | 64.57 | 65.52 | 67.66 | 63.97 | 62.50 | 59.68 | 53.45 | 61.26 | |||||||||||||
1927 | 52.94 | 54.71 | 55.02 | c | 55.73 | 58.58 | 61.40 | 65.50 | 65.65 | 63.40 | 61.90 | 59.57 | 54.27 | 59.06 | ||||||||||||
1928 | 54.42 | 55.89 | b | 56.95 | 57.35 | 60.76 | 62.12 | 63.50 | b | 64.13 | 62.78 | 58.15 | 56.96 | b | 53.03 | 58.84 | ||||||||||
1929 | 51.08 | a | 51.50 | 52.85 | 54.23 | 59.92 | 62.77 | d | 66.23 | e | 67.85 | d | 65.28 | l | 63.91 | i | 57.80 | j | 58.29 | j | 58.31 | d | ||||
1930 | 53.86 | i | 54.47 | j | 57.28 | d | 59.22 | g | 57.81 | g | 62.47 | 65.35 | h | 66.95 | a | 64.08 | 63.00 | h | 57.43 | a | 54.88 | k | 61.64 | g | ||
1931 | 56.65 | k | 57.34 | 60.35 | 62.68 | b | 65.48 | a | 67.91 | a | 73.34 | 73.13 | 68.12 | 68.53 | a | 57.67 | c | 54.73 | 64.48 | a | ||||||
1932 | 53.82 | 55.53 | 59.25 | a | 58.50 | 62.13 | 62.67 | 65.45 | 64.61 | 65.00 | a | 63.82 | a | 63.52 | 55.27 | 60.80 | ||||||||||
1933 | 53.35 | 53.66 | 57.18 | a | 57.84 | a | 57.97 | 61.12 | 65.16 | 65.81 | 62.28 | 62.10 | 61.07 | 55.05 | 59.38 | |||||||||||
1934 | 56.58 | 57.95 | 60.68 | 61.60 | 64.52 | 63.90 | a | 69.02 | 68.89 | 68.82 | 64.87 | a | 60.77 | 59.48 | 63.09 | |||||||||||
1935 | 56.52 | 60.83 | d | 56.06 | 60.98 | 62.56 | 63.20 | 66.15 | 69.89 | 68.43 | a | 65.37 | 58.87 | 55.60 | a | 62.04 | ||||||||||
1936 | 54.98 | a | 55.15 | b | 56.20 | a | 55.70 | 62.75 | a | 64.68 | 69.82 | 69.08 | a | 65.73 | 63.50 | 62.17 | a | 56.60 | 61.36 | |||||||
1937 | 47.95 | 51.17 | a | 54.60 | 57.05 | a | 60.92 | a | 62.88 | 66.47 | a | 66.87 | l | 66.78 | 62.27 | 58.68 | b | 57.77 | 58.78 | a | ||||||
1938 | 56.75 | a | 55.14 | 56.25 | a | 58.25 | 60.07 | a | 61.90 | 64.55 | 68.15 | 67.92 | 62.44 | 57.36 | a | 58.03 | 60.57 | |||||||||
1939 | 54.34 | 51.39 | 53.05 | 58.20 | 60.40 | 63.38 | 66.43 | a | 67.10 | 70.26 | a | 66.87 | 61.38 | a | 58.62 | e | 60.95 | |||||||||
1940 | 56.92 | a | 56.69 | 58.13 | 59.97 | a | 62.13 | a | 63.02 | 65.31 | 66.47 | 65.97 | 64.48 | 59.40 | a | 57.76 | 61.35 | |||||||||
1941 | 56.53 | 58.05 | 59.53 | a | 58.38 | 64.48 | a | 63.34 | a | 65.27 | 67.43 | a | 64.78 | a | 63.39 | 60.52 | c | 56.45 | 61.51 | |||||||
1942 | 55.97 | a | 54.70 | 55.24 | 58.57 | 60.25 | a | 61.75 | 65.21 | 65.37 | a | 63.72 | 64.20 | a | 59.00 | 55.73 | 59.97 | |||||||||
1943 | 55.70 | a | 57.50 | 58.02 | 58.78 | g | 61.82 | t | 62.65 | d | 68.27 | 68.89 | 67.68 | 65.11 | 61.27 | 58.39 | 62.35 | b | ||||||||
1944 | 55.44 | e | 53.86 | 57.37 | a | 56.27 | 59.60 | 61.12 | 62.77 | 64.32 | 64.37 | 63.85 | 58.22 | 56.27 | a | 59.45 | ||||||||||
1945 | 53.63 | 55.09 | 54.69 | 56.62 | 59.12 | b | 61.86 | a | 65.91 | d | 67.21 | g | ----- | z | ----- | z | 57.66 | b | 54.63 | a | 57.69 | c | ||||
1946 | 54.02 | a | 52.63 | b | 54.91 | b | 57.75 | b | 60.00 | a | 62.57 | a | 65.75 | a | 67.33 | b | 67.70 | 63.65 | 57.33 | 54.29 | 59.83 | |||||
1947 | 51.90 | 54.92 | b | 57.58 | a | 60.22 | 62.56 | 65.05 | a | 65.81 | b | 67.31 | b | 66.79 | a | 65.18 | 56.89 | b | 55.03 | 60.77 | ||||||
1948 | 54.90 | a | 52.67 | 53.15 | 57.95 | a | 59.38 | a | 61.88 | a | 62.90 | 63.23 | 64.20 | 61.71 | 58.16 | b | 52.63 | 58.56 | ||||||||
1949 | 47.67 | a | 50.34 | 53.72 | a | 57.63 | 60.62 | a | 64.78 | a | 64.98 | c | 65.85 | 65.80 | 61.27 | 60.50 | 53.00 | 58.85 | ||||||||
1950 | 49.48 | 51.45 | 54.15 | 57.40 | 58.13 | a | 60.43 | a | 66.31 | 64.21 | 63.38 | 61.60 | 59.12 | 56.71 | 58.53 | |||||||||||
1951 | 53.24 | 51.80 | 54.05 | 56.84 | a | 57.52 | a | 61.37 | 64.98 | 64.79 | 64.55 | 64.00 | 58.98 | d | 53.24 | 58.78 | ||||||||||
1952 | 51.15 | 54.84 | a | 52.68 | 56.10 | 59.39 | 60.07 | 62.24 | 64.71 | b | 65.88 | a | 61.08 | 56.75 | 53.44 | 58.19 | ||||||||||
1953 | 56.80 | a | 56.43 | 54.03 | 55.24 | a | 59.78 | a | 60.33 | 66.52 | a | 64.52 | c | 63.27 | 62.92 | 58.90 | a | 55.73 | a | 59.54 | ||||||
1954 | 52.63 | 57.22 | a | 54.35 | 55.29 | a | 58.44 | 61.75 | 68.24 | 67.18 | 63.52 | a | 60.47 | a | 59.19 | a | 54.50 | a | 59.40 | |||||||
1955 | 50.77 | a | 51.93 | 55.53 | a | 57.48 | f | 57.05 | a | 60.14 | e | 62.79 | 66.24 | 66.03 | 58.44 | 55.75 | b | 52.73 | a | 57.95 | a | |||||
1956 | 52.16 | 49.43 | 53.18 | 53.52 | a | 59.08 | 60.45 | 64.03 | 64.37 | 64.18 | 60.21 | 59.03 | 54.92 | 57.88 | ||||||||||||
1957 | 48.45 | a | 52.52 | a | 53.16 | 53.78 | 56.66 | 60.39 | b | 63.16 | 66.95 | 64.13 | 61.44 | 57.12 | 56.95 | 57.89 | ||||||||||
1958 | 55.74 | 55.98 | 54.08 | 58.82 | 59.97 | 63.57 | a | 64.52 | 67.44 | 66.85 | 66.26 | 57.32 | 57.67 | a | 60.68 | |||||||||||
1959 | 55.97 | a | 54.39 | 58.92 | a | 59.95 | 61.73 | 65.05 | 70.13 | 69.94 | 68.68 | 64.87 | 62.07 | 57.73 | 62.45 | |||||||||||
1960 | 52.27 | 54.02 | a | 56.35 | 59.22 | 61.60 | 63.12 | 66.58 | a | 67.37 | 67.63 | 63.66 | 57.32 | 54.42 | a | 60.30 | ||||||||||
1961 | 57.37 | 57.61 | 56.95 | 58.08 | 59.65 | a | 62.25 | 67.63 | 68.11 | 65.22 | 63.11 | 57.48 | 52.32 | 60.48 | ||||||||||||
1962 | 54.79 | 53.02 | c | 52.89 | ----- | z | 58.31 | d | 60.88 | 62.64 | c | 65.29 | 63.30 | 60.44 | 58.22 | 54.77 | 58.60 | a | ||||||||
1963 | 53.60 | 57.11 | 55.73 | 55.63 | 60.90 | 62.15 | 64.16 | 67.55 | 71.27 | d | 66.58 | 58.53 | 56.15 | 60.78 | ||||||||||||
1964 | 54.53 | b | 55.02 | b | 55.11 | 56.67 | a | 57.11 | 59.93 | a | 65.89 | 70.24 | b | 68.53 | a | 66.88 | b | 58.07 | 56.88 | a | 60.41 | |||||
1965 | 55.11 | 54.61 | 57.29 | 58.16 | a | 60.16 | 60.95 | 64.02 | a | ----- | z | 66.37 | 67.45 | ----- | z | 54.92 | 59.90 | b | ||||||||
1966 | 54.03 | a | 54.62 | 57.03 | 62.50 | ----- | z | 64.35 | 65.84 | 68.64 | b | 67.55 | 66.63 | 60.53 | 57.53 | 61.75 | a | |||||||||
1967 | 55.78 | a | 56.96 | b | 57.40 | 55.27 | 62.23 | 64.14 | a | 70.18 | 73.39 | 71.92 | 67.32 | 65.07 | a | 56.43 | b | 63.01 | ||||||||
1968 | ----- | z | 57.66 | ----- | z | 61.92 | d | 63.71 | b | 65.10 | 68.06 | 68.40 | 67.57 | 62.97 | 61.28 | 54.10 | 63.08 | b | ||||||||
1969 | 56.47 | 52.02 | 54.89 | 60.47 | 61.03 | 64.57 | ----- | z | 68.87 | 64.75 | 62.02 | ----- | z | 55.15 | 60.02 | b | ||||||||||
1970 | 56.69 | 58.55 | 52.55 | 56.92 | 58.23 | a | 60.41 | a | 64.05 | 63.94 | 61.83 | 59.63 | a | 54.92 | 51.12 | a | 58.24 | |||||||||
1971 | 50.21 | 52.30 | 53.19 | 54.75 | 56.64 | b | 59.10 | 65.34 | 70.42 | 67.55 | 61.33 | a | 56.20 | 51.32 | 58.20 | |||||||||||
1972 | 50.82 | 53.00 | a | 57.02 | 57.75 | 60.55 | 64.65 | 68.05 | 68.37 | 65.68 | 63.97 | 57.13 | 53.84 | 60.07 | ||||||||||||
1973 | 52.72 | a | 55.57 | 53.79 | 56.37 | 58.24 | 61.41 | a | ----- | z | 66.35 | 64.82 | 61.35 | 56.15 | 55.50 | 58.39 | a | |||||||||
1974 | 52.23 | 54.59 | 54.32 | 57.30 | 59.18 | 63.20 | 66.03 | 65.63 | 65.66 | a | 62.40 | 58.73 | 53.74 | 59.42 | ||||||||||||
1975 | 52.73 | 52.59 | 53.33 | j | 55.00 | v | 58.40 | 60.87 | 64.32 | 65.02 | 66.28 | 62.08 | 58.20 | b | 53.24 | 59.37 | b | |||||||||
1976 | 55.90 | 55.66 | 56.61 | 57.78 | 62.58 | a | 68.10 | 69.42 | 68.69 | 69.12 | 67.65 | a | 63.40 | 59.15 | 62.84 | |||||||||||
1977 | 57.15 | 58.96 | a | 56.75 | a | 61.88 | 63.26 | b | 65.29 | b | 68.71 | b | 71.43 | a | 69.37 | 65.95 | 62.10 | a | 60.30 | a | 63.43 | |||||
1978 | 58.68 | 57.88 | b | 61.90 | 61.78 | 67.24 | 70.17 | 69.74 | 70.95 | 71.15 | 66.65 | a | 58.42 | 53.69 | 64.02 | |||||||||||
1979 | 55.31 | 54.64 | 58.68 | 62.35 | 64.87 | a | 68.82 | b | 68.82 | 70.95 | 72.11 | b | 66.47 | b | 61.13 | 58.97 | 63.59 | |||||||||
1980 | 59.79 | 61.40 | 60.50 | 63.93 | 63.90 | 67.05 | 71.32 | a | 71.12 | c | ----- | z | ----- | z | ----- | z | 58.27 | 64.14 | c | |||||||
1981 | 59.42 | 60.34 | 59.16 | 60.55 | 64.45 | 68.52 | a | 70.13 | 70.39 | 68.75 | 65.82 | 62.93 | 58.85 | 64.11 | ||||||||||||
1982 | 56.40 | 58.73 | 58.27 | 60.15 | 61.75 | a | 61.79 | a | 65.89 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 60.43 | e | |||||
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 | 53.23 | 57.73 | 58.90 | 62.42 | 68.63 | 67.34 | 66.53 | 66.47 | 57.21 | b | 56.23 | 61.47 | b | |||||||||
1986 | 58.60 | b | 56.96 | 57.65 | 60.20 | 61.30 | a | 63.32 | 65.23 | 66.56 | 63.64 | a | 63.42 | 63.15 | 57.68 | 61.48 | ||||||||||
1987 | 54.90 | 56.64 | 57.23 | a | 59.90 | e | 61.06 | 62.43 | 63.21 | 66.08 | 66.50 | 64.97 | ----- | z | 49.67 | m | 61.29 | b | ||||||||
1988 | 53.77 | 56.12 | 57.90 | 57.58 | 58.47 | 60.15 | 65.40 | 65.50 | 64.22 | 62.48 | 57.40 | 54.02 | 59.42 | |||||||||||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 54.60 | 55.37 | 56.64 | 58.41 | 60.58 | 62.95 | 66.32 | 67.48 | 66.30 | 63.79 | 59.55 | 55.88 | 60.69 | |||||||||||||
S.D. | 2.81 | 2.58 | 2.57 | 2.36 | 2.31 | 2.24 | 2.51 | 2.51 | 2.53 | 2.51 | 2.38 | 2.35 | 1.71 | |||||||||||||
SKEW | -0.05 | 0.12 | 0.35 | 0.18 | 0.57 | 1.02 | 1.07 | 0.78 | 0.57 | 0.04 | 0.52 | 0.58 | 0.35 | |||||||||||||
MAX | 63.45 | 61.40 | 62.76 | 63.93 | 67.24 | 70.17 | 75.60 | 74.94 | 73.31 | 70.77 | 66.12 | 64.43 | 64.27 | |||||||||||||
MIN | 47.67 | 49.43 | 52.55 | 53.52 | 56.64 | 59.10 | 62.24 | 63.23 | 61.67 | 58.15 | 54.92 | 51.12 | 57.88 | |||||||||||||
YRS | 71 | 74 | 74 | 71 | 73 | 76 | 73 | 72 | 71 | 71 | 68 | 72 | 54 |