YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1906 | 49.89 | 52.84 | 50.47 | 52.97 | 57.29 | 65.42 | 76.15 | 72.06 | 68.35 | 66.39 | 52.45 | 49.58 | 59.49 | |||||||||||||
1907 | 44.90 | 55.23 | 50.63 | 55.27 | 58.02 | 63.13 | 73.50 | 70.69 | 67.08 | 60.95 | 54.33 | 51.06 | 58.73 | |||||||||||||
1908 | 49.18 | 47.47 | 53.45 | 56.62 | 55.03 | 62.85 | 76.03 | 72.76 | 67.53 | 58.21 | 55.85 | 49.50 | 58.71 | |||||||||||||
1909 | 48.85 | a | 47.70 | 47.10 | 55.12 | 57.53 | 67.02 | 71.37 | d | 73.85 | a | 67.70 | 61.53 | 54.42 | 45.66 | 58.15 | ||||||||||
1910 | 49.67 | g | 48.02 | g | 55.08 | 59.03 | 63.84 | 65.38 | 73.79 | 74.74 | 70.25 | 61.89 | 54.97 | 52.02 | 63.10 | b | ||||||||||
1911 | 49.77 | 43.23 | 52.50 | a | 52.50 | 55.74 | 64.45 | 73.50 | 71.87 | 66.52 | 60.95 | 54.35 | 46.84 | 57.69 | ||||||||||||
1912 | 51.44 | 51.98 | 45.79 | 49.57 | 58.55 | 66.50 | 69.66 | 68.77 | 66.22 | 57.00 | 56.37 | 48.73 | 57.55 | |||||||||||||
1913 | 44.29 | 45.64 | 49.40 | 53.38 | 58.85 | 63.58 | 71.31 | 73.00 | 70.95 | 62.13 | 53.00 | 47.10 | 57.72 | |||||||||||||
1914 | 47.76 | 49.36 | 54.19 | 55.15 | 58.67 | a | 65.76 | a | 74.52 | 73.19 | 68.52 | 61.65 | 57.23 | 41.94 | 58.99 | |||||||||||
1915 | 43.98 | a | 44.23 | b | 50.58 | 52.60 | e | 55.74 | 66.55 | 71.45 | 75.11 | 68.45 | 65.55 | 54.48 | b | 48.61 | 58.11 | |||||||||
1916 | 44.17 | d | 53.32 | a | 56.65 | 57.43 | 58.57 | a | 67.15 | c | 74.55 | 72.92 | 70.50 | 56.44 | 53.75 | 44.74 | 59.18 | |||||||||
1917 | 43.23 | 47.41 | 48.39 | 52.87 | 54.06 | 69.43 | 77.34 | 74.65 | 71.53 | 67.00 | 56.80 | 54.87 | 59.80 | |||||||||||||
1918 | 48.92 | 49.61 | 53.98 | 55.57 | 57.06 | 73.72 | 74.84 | 73.81 | 71.82 | 65.69 | 51.65 | 46.61 | 60.27 | |||||||||||||
1919 | 49.47 | 44.71 | 48.48 | 56.78 | 62.34 | 69.87 | 77.37 | 76.74 | 70.82 | 57.60 | b | 52.37 | 50.26 | 59.73 | ||||||||||||
1920 | 50.61 | 50.24 | 48.94 | 53.13 | 61.32 | 66.48 | 76.66 | 74.77 | 67.82 | 57.63 | 53.33 | 46.81 | 58.98 | |||||||||||||
1921 | 46.19 | 51.27 | 52.65 | 54.70 | 56.87 | 65.77 | 76.42 | 75.10 | 68.72 | 64.09 | b | 59.22 | c | 55.48 | 60.54 | |||||||||||
1922 | 46.77 | 45.93 | 49.16 | 51.90 | 60.23 | 67.03 | a | 75.06 | 74.79 | 73.95 | 62.90 | 53.67 | 51.48 | 59.41 | ||||||||||||
1923 | 50.56 | 48.45 | 51.44 | 52.75 | 61.23 | 62.43 | 73.23 | 72.40 | 68.67 | 59.89 | 56.43 | 48.31 | 58.81 | |||||||||||||
1924 | 47.63 | 54.29 | 47.61 | 52.90 | 62.87 | 69.95 | a | 73.26 | 74.42 | 72.63 | 60.97 | 55.80 | 47.68 | 60.00 | ||||||||||||
1925 | 48.93 | a | 52.25 | 54.50 | 55.17 | 64.62 | s | 67.47 | 76.15 | 71.63 | 66.15 | 58.52 | 49.93 | 51.10 | 59.25 | a | ||||||||||
1926 | 48.03 | 52.39 | 54.63 | 57.37 | 61.00 | 71.28 | 76.35 | a | 74.76 | f | 68.23 | 63.32 | 57.87 | 44.53 | 59.55 | a | ||||||||||
1927 | 50.31 | 49.96 | 49.92 | 54.18 | 60.13 | 66.93 | 76.15 | 74.19 | 66.28 | 64.08 | 57.12 | 46.58 | 59.65 | |||||||||||||
1928 | 51.15 | 48.84 | 53.16 | 55.72 | 64.47 | 68.27 | 74.84 | 73.89 | 72.03 | 61.39 | 56.22 | 49.23 | 60.77 | |||||||||||||
1929 | 45.69 | 43.73 | 47.65 | 49.82 | 56.60 | 65.05 | 72.23 | 75.23 | 66.75 | 61.39 | 54.35 | 53.19 | 57.64 | |||||||||||||
1930 | 42.89 | 49.11 | 49.68 | 53.40 | 51.58 | 64.03 | 71.39 | 72.23 | 63.55 | 58.87 | 52.02 | 45.56 | 56.19 | |||||||||||||
1931 | 46.74 | 47.32 | 52.97 | 55.95 | 62.76 | 64.98 | 77.98 | 73.37 | 66.33 | 59.95 | 47.63 | 43.27 | 58.27 | |||||||||||||
1932 | 41.65 | 44.31 | 51.42 | 51.78 | 58.02 | 64.32 | 71.34 | 71.56 | 69.73 | 58.94 | 55.28 | 42.15 | 56.71 | |||||||||||||
1933 | 40.08 | 41.93 | 49.16 | 50.10 | 52.08 | 64.45 | 74.34 | 71.87 | 66.13 | 63.23 | 56.15 | 49.10 | 56.55 | |||||||||||||
1934 | 48.23 | 49.43 | 57.65 | 58.33 | 61.74 | 61.25 | 73.45 | 73.24 | 67.20 | 60.65 | 52.73 | 49.48 | 59.45 | |||||||||||||
1935 | 46.32 | 49.12 | 46.56 | 53.40 | 56.52 | 67.22 | 71.23 | 74.29 | 71.03 | 59.45 | 49.80 | 47.42 | 57.70 | |||||||||||||
1936 | 46.81 | 46.41 | 51.61 | 55.20 | 60.15 | 67.10 | 75.34 | 74.37 | 68.75 | 58.24 | 50.68 | 42.69 | 58.11 | |||||||||||||
1937 | 33.40 | 43.57 | 46.26 | 49.70 | 57.34 | 64.55 | 73.00 | 73.89 | 70.75 | 61.47 | 52.28 | 48.26 | 56.21 | |||||||||||||
1938 | 47.52 | 43.50 | 45.48 | 51.70 | 57.26 | 64.12 | 72.32 | 72.00 | 69.87 | 56.97 | 49.15 | 48.84 | 56.56 | |||||||||||||
1939 | 43.11 | 39.32 | 48.47 | 57.43 | 59.81 | 65.95 | 73.27 | 76.26 | 67.70 | 59.66 | 54.68 | 53.44 | 58.26 | |||||||||||||
1940 | 46.50 | ----- | z | ----- | z | 55.27 | 63.02 | 68.73 | 71.52 | 74.18 | 66.50 | 60.02 | 50.70 | 49.89 | 60.63 | b | ||||||||||
1941 | 44.94 | 49.05 | 49.84 | 49.58 | 60.97 | 62.62 | 72.69 | 68.47 | 62.28 | 55.26 | 52.98 | 45.13 | 56.15 | |||||||||||||
1942 | 47.08 | 43.96 | 47.95 | 51.30 | 56.23 | 65.69 | a | 75.85 | 74.08 | a | 66.03 | 60.00 | 54.22 | 48.23 | 57.55 | |||||||||||
1943 | 46.12 | a | 48.89 | 49.40 | a | 54.63 | 61.05 | 62.87 | ----- | z | 73.77 | 71.43 | 62.71 | 53.80 | 45.65 | 57.30 | a | |||||||||
1944 | 44.53 | 42.29 | 48.21 | 50.74 | a | 58.10 | 60.20 | b | 67.48 | 72.18 | 68.77 | 60.90 | a | ----- | z | 47.76 | 56.47 | a | ||||||||
1945 | 45.44 | 46.21 | 44.53 | 52.53 | 56.42 | 63.62 | a | 75.84 | 72.18 | 68.35 | 60.31 | 49.80 | 46.23 | 56.79 | ||||||||||||
1946 | 44.68 | 43.56 | a | 47.66 | 55.57 | 57.11 | 66.20 | 72.53 | 72.97 | 70.08 | 55.85 | 47.98 | 48.81 | 56.92 | ||||||||||||
1947 | 43.74 | 49.94 | d | 50.31 | 54.85 | 61.45 | 63.88 | 72.08 | 70.61 | 71.35 | 59.12 | a | 48.00 | d | 44.57 | a | 57.49 | |||||||||
1948 | 48.02 | 43.45 | 44.22 | f | 53.84 | k | 57.98 | g | 63.60 | a | 70.84 | 71.10 | 68.97 | 59.34 | 49.02 | 43.05 | 57.49 | c | ||||||||
1949 | 33.81 | 41.14 | 45.26 | 55.42 | 56.98 | 67.03 | 71.66 | o | 70.37 | 70.97 | 57.56 | 57.90 | 44.27 | 54.61 | a | |||||||||||
1950 | 40.89 | 49.12 | 49.50 | 55.72 | 57.00 | 63.90 | 73.27 | 72.44 | 65.88 | 63.77 | 56.78 | 52.76 | 58.42 | |||||||||||||
1951 | 45.27 | c | 42.62 | k | 48.98 | 52.98 | 59.23 | 63.80 | 74.42 | 72.32 | 70.63 | 60.06 | d | 49.50 | 43.60 | 58.25 | a | |||||||||
1952 | 41.35 | 45.59 | b | 43.27 | 53.55 | a | 62.43 | a | 62.42 | 72.60 | a | 74.92 | 70.88 | 63.90 | 47.57 | 45.07 | b | 56.96 | ||||||||
1953 | 50.66 | 46.30 | 47.84 | 50.42 | 53.34 | 63.22 | 76.52 | i | 71.15 | 68.35 | 57.89 | 53.22 | 45.74 | 55.28 | a | |||||||||||
1954 | 44.00 | 50.04 | 45.23 | 55.00 | 61.91 | c | 66.29 | d | 75.16 | b | 68.17 | e | 67.82 | b | 59.44 | e | 53.23 | h | 44.79 | c | 57.99 | a | ||||
1955 | 40.05 | 42.85 | a | 48.13 | a | 49.82 | b | 55.54 | g | 62.85 | g | 68.12 | a | 76.27 | 69.22 | a | 60.24 | 52.28 | 45.90 | 55.29 | b | |||||
1956 | 46.85 | 41.93 | 49.24 | 50.37 | 58.68 | 68.82 | 72.35 | 68.53 | 72.28 | 56.55 | 52.95 | 47.37 | 57.16 | |||||||||||||
1957 | 41.90 | 50.64 | 49.19 | 51.66 | b | 55.33 | a | 69.81 | a | 74.24 | 73.35 | 68.17 | f | 56.48 | 47.63 | 49.05 | 56.30 | a | ||||||||
1958 | 46.26 | 48.05 | 43.58 | 52.40 | 61.84 | 64.63 | 69.44 | 76.18 | a | 70.30 | 64.27 | 51.58 | 51.95 | 58.37 | ||||||||||||
1959 | 48.69 | 43.62 | 53.00 | h | 58.73 | 57.60 | 69.08 | 78.03 | 73.13 | 66.03 | 60.13 | a | 53.72 | a | 48.05 | 59.71 | a | |||||||||
1960 | 41.26 | 44.48 | 52.16 | b | 55.53 | a | 58.67 | b | ----- | z | 73.82 | 72.06 | 69.47 | 57.98 | 49.12 | a | 44.45 | a | 56.27 | a | ||||||
1961 | 47.05 | 47.67 | b | 48.21 | 55.64 | a | 55.98 | a | 68.67 | d | 75.66 | 74.02 | a | 65.38 | 57.12 | c | 48.00 | a | 45.37 | a | 57.40 | |||||
1962 | 44.81 | 45.12 | 45.10 | 57.20 | 55.89 | 65.13 | 71.08 | 74.81 | 69.35 | 60.13 | 53.38 | a | 49.02 | a | 57.58 | |||||||||||
1963 | 42.90 | 53.71 | 47.35 | 48.43 | 58.53 | 62.05 | 71.82 | 72.52 | 70.72 | 61.73 | 51.41 | b | 48.48 | 57.47 | ||||||||||||
1964 | 43.13 | 45.19 | 46.74 | 50.50 | 56.35 | 64.35 | 74.17 | a | 73.39 | 66.88 | 65.16 | 47.53 | a | 45.13 | 56.54 | |||||||||||
1965 | 46.31 | 46.73 | 46.82 | 51.13 | 56.89 | 60.28 | ----- | z | 73.66 | 62.95 | 63.95 | a | ----- | z | 45.06 | 55.38 | b | |||||||||
1966 | 42.94 | 42.36 | 50.07 | a | 54.85 | 59.52 | b | 65.59 | a | 71.16 | 73.48 | a | 67.73 | 60.13 | 50.39 | b | 46.17 | j | 58.02 | a | ||||||
1967 | 46.21 | 48.88 | 49.68 | 44.85 | 59.28 | a | 61.70 | c | 75.52 | a | 77.61 | 67.70 | 62.55 | 55.90 | a | 44.77 | 57.89 | |||||||||
1968 | 46.24 | 52.64 | 50.52 | 53.22 | 59.20 | a | 64.92 | 71.85 | ----- | z | 64.83 | 56.76 | 50.95 | 42.15 | 55.75 | a | ||||||||||
1969 | 49.00 | 42.55 | f | 48.26 | 53.13 | 60.11 | 61.53 | a | 72.08 | 75.58 | 70.70 | 56.39 | 53.45 | 46.98 | 58.84 | a | ||||||||||
1970 | 45.80 | d | 49.34 | 48.97 | 49.12 | 60.81 | 67.82 | 76.29 | 76.13 | 66.87 | 57.47 | 51.00 | 39.87 | 57.46 | ||||||||||||
1971 | 41.85 | 39.61 | ----- | z | ----- | z | 52.77 | 63.02 | 75.32 | 74.26 | 67.52 | 54.27 | 46.00 | a | 36.43 | a | 55.11 | b | ||||||||
1972 | 40.33 | a | 43.02 | b | 54.81 | 53.69 | a | 57.87 | ----- | z | 76.34 | 72.63 | 66.80 | 57.35 | 48.40 | ----- | z | 57.12 | b | |||||||
1973 | ----- | z | 45.61 | 43.37 | 51.61 | c | 62.65 | 69.36 | a | 73.50 | b | 71.93 | b | 65.47 | 60.05 | a | 49.15 | 47.48 | 58.20 | a | ||||||
1974 | ----- | z | 46.82 | 49.42 | 52.78 | 58.75 | a | 68.96 | b | ----- | z | 69.87 | a | 71.22 | 58.81 | 52.05 | 44.18 | a | 57.29 | b | ||||||
1975 | 46.35 | 44.64 | 46.03 | 46.60 | 57.65 | 64.50 | 72.79 | 70.30 | a | 68.72 | 57.74 | 50.34 | a | 47.74 | 56.12 | |||||||||||
1976 | ----- | z | ----- | z | 52.12 | o | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1977 | ----- | z | 50.34 | 42.61 | c | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 46.47 | j | |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 45.57 | 47.12 | 49.31 | 53.36 | 58.55 | 65.58 | 73.65 | 73.12 | 68.51 | 60.23 | 52.58 | 47.16 | 58.09 | |||||||||||||
S.D. | 3.61 | 3.71 | 3.27 | 2.85 | 2.83 | 2.72 | 2.31 | 2.01 | 2.38 | 2.85 | 3.11 | 3.45 | 1.25 | |||||||||||||
SKEW | -0.99 | 0.09 | 0.28 | -0.39 | -0.16 | 0.40 | -0.28 | -0.39 | -0.21 | 0.31 | -0.06 | -0.09 | 0.29 | |||||||||||||
MAX | 51.44 | 55.23 | 57.65 | 59.03 | 64.47 | 73.72 | 78.03 | 77.61 | 73.95 | 67.00 | 59.22 | 55.48 | 60.77 | |||||||||||||
MIN | 33.40 | 39.32 | 42.61 | 44.85 | 51.58 | 60.20 | 67.48 | 68.17 | 62.28 | 54.27 | 46.00 | 36.43 | 56.12 | |||||||||||||
YRS | 67 | 67 | 67 | 68 | 67 | 67 | 65 | 68 | 69 | 70 | 67 | 68 | 47 |