| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1905 | ----- | z | ----- | z | 57.68 | 56.30 | 55.40 | a | 59.87 | 64.65 | 65.74 | 62.67 | 58.35 | 54.73 | 51.61 | 58.70 | ||||||||||
| 1906 | 52.10 | 53.04 | 53.71 | 57.47 | 57.35 | 60.13 | 66.42 | 64.84 | 62.33 | 60.90 | 54.10 | 51.45 | 57.82 | |||||||||||||
| 1907 | 47.90 | 55.25 | 51.00 | 56.20 | 59.42 | 60.70 | 64.58 | 65.39 | 61.43 | 61.52 | 55.93 | 53.23 | 57.71 | |||||||||||||
| 1908 | 52.71 | 50.69 | 51.52 | 55.50 | 54.48 | 59.73 | 65.71 | 62.23 | 62.60 | 59.13 | 56.50 | 51.90 | a | 56.89 | ||||||||||||
| 1909 | ----- | z | 49.61 | 52.74 | 56.40 | 56.61 | 60.70 | 62.32 | 63.87 | 65.10 | 61.71 | 54.17 | a | 53.52 | 57.89 | |||||||||||
| 1910 | 47.88 | w | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 53.90 | 53.90 | ||
| 1911 | 50.30 | a | 49.18 | 57.03 | 54.73 | 55.42 | 60.83 | 65.29 | 68.77 | 63.73 | 62.03 | 54.57 | 51.13 | 57.75 | ||||||||||||
| 1912 | 52.07 | a | 54.21 | 55.68 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 53.98 | |||
| 1913 | ----- | z | 53.86 | 51.42 | 55.10 | 59.90 | 61.30 | 66.83 | a | 67.97 | 66.37 | 63.26 | 54.70 | 53.03 | 59.43 | |||||||||||
| 1914 | 51.06 | 54.36 | 57.13 | 58.03 | 61.77 | 62.50 | 66.97 | 67.58 | 63.30 | 60.77 | 59.70 | 53.19 | 59.70 | |||||||||||||
| 1915 | 55.45 | 54.32 | 58.16 | 58.73 | 58.00 | 64.80 | 66.74 | 70.32 | 66.60 | 55.70 | a | 49.12 | e | 47.90 | 58.82 | |||||||||||
| 1916 | 43.06 | 50.34 | 48.39 | 51.03 | 49.87 | a | 52.23 | 58.81 | 56.94 | ----- | z | ----- | z | ----- | z | ----- | z | 51.33 | ||||||||
| 1917 | 47.00 | 43.54 | 44.32 | 48.23 | 50.29 | 50.87 | 58.58 | 58.06 | ----- | z | 56.19 | 44.37 | 51.29 | 50.25 | ||||||||||||
| 1918 | 56.10 | 52.04 | 54.39 | 53.13 | 55.16 | 58.87 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 54.65 | 54.90 | ||||||||
| 1919 | 57.06 | 52.61 | 54.10 | 57.53 | 59.55 | 62.73 | 64.68 | 67.35 | 65.87 | 61.29 | 54.13 | 55.03 | 59.33 | |||||||||||||
| 1920 | 54.16 | 56.07 | 52.19 | 54.80 | 59.23 | 63.10 | 65.65 | 68.42 | 63.97 | 61.00 | 56.37 | 52.26 | 58.93 | |||||||||||||
| 1921 | 51.65 | 52.04 | 54.16 | 54.87 | 57.74 | 62.20 | 66.10 | 67.45 | 67.67 | 61.23 | 58.60 | 55.61 | 59.11 | |||||||||||||
| 1922 | 51.42 | 51.07 | 50.94 | 53.27 | 59.65 | 65.40 | 66.52 | 67.00 | 67.57 | ----- | z | ----- | z | ----- | z | 59.20 | ||||||||||
| 1923 | ----- | z | ----- | z | ----- | z | 62.63 | 65.13 | 67.00 | 71.97 | 76.42 | 74.33 | 66.13 | 65.93 | 58.87 | 67.60 | ||||||||||
| 1924 | 57.45 | 59.66 | 57.13 | 62.10 | 65.94 | 67.20 | 70.45 | 68.87 | 65.47 | 60.00 | 57.17 | 51.68 | 61.93 | |||||||||||||
| 1925 | 50.65 | 54.71 | 55.55 | 57.17 | 60.81 | 63.97 | 67.13 | 66.32 | 64.93 | 64.81 | 55.63 | 56.39 | 59.84 | |||||||||||||
| 1926 | 55.71 | 56.54 | 61.61 | 60.87 | g | 61.80 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 58.91 | ||||
| 1927 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 70.03 | 70.03 | 69.13 | 65.29 | 58.83 | 54.00 | 64.55 | |||||||
| 1928 | 55.52 | 57.17 | 58.97 | 58.60 | 63.23 | 66.80 | 68.81 | 69.13 | 67.10 | 62.61 | 57.57 | 55.61 | 61.76 | |||||||||||||
| 1929 | 52.35 | 53.89 | 55.94 | 56.17 | 62.45 | 65.90 | 70.13 | 71.03 | 69.67 | 64.58 | 62.67 | 55.39 | 61.68 | |||||||||||||
| 1930 | 50.10 | 56.25 | 61.39 | 61.73 | 61.45 | 64.87 | 68.06 | 72.06 | 67.83 | 64.97 | 60.97 | 56.55 | 62.19 | |||||||||||||
| 1931 | 56.77 | 58.32 | 59.19 | 63.80 | 66.61 | 67.43 | 70.52 | 69.48 | 69.47 | 63.94 | 56.30 | 51.29 | 62.76 | |||||||||||||
| 1932 | 51.81 | 53.17 | 57.68 | 59.33 | 62.65 | 67.10 | 68.26 | 71.42 | 70.20 | 62.90 | 60.10 | 51.45 | 61.34 | |||||||||||||
| 1933 | 51.26 | 53.04 | 54.97 | 59.00 | 58.26 | 65.70 | 69.19 | 69.48 | 64.83 | 63.32 | 62.27 | 54.72 | f | 61.03 | ||||||||||||
| 1934 | 55.50 | i | 56.96 | b | 60.48 | d | 60.00 | d | 64.08 | e | 65.17 | 67.24 | f | ----- | z | ----- | z | ----- | z | ----- | z | 59.74 | 61.07 | |||
| 1935 | 54.35 | 58.90 | h | 55.00 | q | 61.29 | f | 62.04 | f | 66.56 | c | 69.79 | b | 71.87 | a | 66.88 | d | 64.52 | h | 57.41 | a | 57.08 | e | 63.42 | ||
| 1936 | 57.08 | f | 55.70 | i | 57.48 | 60.33 | 64.52 | 69.00 | 72.32 | 74.26 | 72.27 | 68.68 | 59.43 | 55.03 | 65.33 | |||||||||||
| 1937 | 47.94 | 52.93 | 55.74 | 56.97 | 60.77 | 64.17 | 70.10 | 71.23 | 67.67 | 63.13 | 59.70 | 58.55 | 60.74 | |||||||||||||
| 1938 | 56.87 | 55.21 | 56.68 | 60.00 | 63.81 | 69.87 | 67.87 | 68.87 | 66.17 | 61.52 | 57.07 | 55.00 | 61.58 | |||||||||||||
| 1939 | 55.61 | 52.86 | 56.06 | 59.63 | 63.84 | 65.43 | 68.90 | 64.65 | 64.52 | c | 58.93 | b | 55.52 | a | 55.74 | 60.14 | ||||||||||
| 1940 | 57.74 | ----- | z | ----- | z | 63.63 | 64.03 | 65.63 | 68.81 | 69.10 | 67.80 | 65.32 | 58.20 | 58.65 | 63.89 | |||||||||||
| 1941 | 61.65 | 59.43 | 61.77 | 59.17 | 64.35 | 66.67 | 69.32 | c | 68.58 | 68.53 | 63.94 | 61.10 | 55.35 | 63.32 | ||||||||||||
| 1942 | 56.90 | 54.86 | 56.25 | g | ----- | z | ----- | z | 66.40 | 68.94 | 69.03 | ----- | z | ----- | z | ----- | z | ----- | z | 63.23 | ||||||
| 1943 | ----- | z | ----- | z | ----- | z | 56.00 | 57.52 | 59.87 | 63.23 | 63.97 | 65.00 | 60.35 | 59.13 | 55.06 | 60.01 | ||||||||||
| 1944 | 53.84 | 51.55 | 53.45 | 53.97 | 57.29 | 60.17 | 62.71 | 65.97 | 62.83 | 61.81 | 56.50 | 57.55 | 58.14 | |||||||||||||
| 1945 | 54.13 | 52.18 | 50.23 | 53.47 | 55.81 | 62.30 | 63.65 | 62.74 | 63.57 | 59.39 | 54.83 | 53.81 | 57.17 | |||||||||||||
| 1946 | 51.90 | 50.57 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 51.24 | |||
| 1947 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 67.00 | z | 67.97 | 69.52 | 69.50 | 64.48 | h | ----- | z | ----- | z | 68.99 | ||||
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 67.29 | 67.71 | 65.27 | 61.00 | a | 54.40 | 48.23 | 60.65 | ||||||
| 1949 | 47.03 | 48.11 | 53.94 | 58.17 | 61.68 | 65.00 | 66.03 | 68.39 | 65.23 | 58.87 | 60.07 | c | 51.52 | 58.67 | ||||||||||||
| 1950 | 45.65 | 52.00 | 52.48 | 56.93 | 60.58 | 63.57 | b | 68.33 | d | 69.13 | a | 65.97 | 60.35 | 58.93 | a | ----- | z | 59.45 | ||||||||
| 1951 | ----- | z | 51.60 | h | 52.55 | 57.07 | 58.71 | 60.97 | 63.61 | 65.42 | 60.97 | 59.84 | 55.00 | 48.97 | 58.31 | |||||||||||
| 1952 | 47.32 | 49.90 | 50.50 | e | 55.70 | 58.79 | g | 58.87 | 63.42 | 63.42 | 60.47 | 59.87 | 56.53 | 51.71 | 56.16 | |||||||||||
| 1953 | 53.42 | 52.11 | 55.32 | 57.41 | a | 59.10 | 61.90 | 66.58 | 66.10 | 66.69 | a | 62.19 | 56.10 | 53.61 | 59.21 | |||||||||||
| 1954 | 50.42 | 54.29 | 54.61 | 56.57 | 59.97 | 61.67 | 63.03 | 64.10 | 65.00 | 62.84 | 57.67 | ----- | z | 59.10 | ||||||||||||
| 1955 | 50.52 | 53.04 | 55.37 | a | 54.50 | 63.29 | 66.93 | 63.16 | 64.52 | 65.87 | 59.68 | 53.07 | 52.77 | 58.56 | ||||||||||||
| 1956 | 51.74 | 49.00 | 51.74 | 56.70 | 62.81 | 62.90 | 65.58 | 66.47 | l | 65.37 | 61.32 | 56.80 | 52.26 | 57.84 | ||||||||||||
| 1957 | 47.52 | 53.11 | 53.87 | 58.43 | 62.16 | 65.47 | 67.84 | 68.68 | 67.63 | 62.61 | 58.90 | 58.23 | 60.37 | |||||||||||||
| 1958 | 57.97 | 60.54 | 59.74 | 60.23 | 63.97 | 67.13 | 68.61 | 69.94 | 69.93 | 64.26 | 58.80 | 59.03 | 63.35 | |||||||||||||
| 1959 | 56.35 | 59.14 | 57.90 | 61.37 | 63.52 | 66.13 | 68.61 | 69.06 | 67.33 | 64.23 | 60.50 | 57.84 | 62.67 | |||||||||||||
| 1960 | 57.10 | 58.21 | 61.45 | 60.83 | a | 63.90 | 68.50 | 64.07 | a | 66.94 | 63.87 | 61.13 | 57.73 | 57.71 | 61.79 | |||||||||||
| 1961 | 58.55 | 56.11 | 56.39 | 57.41 | a | 60.94 | 65.77 | 63.35 | 63.19 | 59.63 | 54.55 | 51.39 | l | 51.13 | 58.82 | |||||||||||
| 1962 | 53.16 | 52.07 | a | 53.90 | 58.13 | 59.81 | 62.07 | 66.23 | 66.29 | 67.33 | 63.17 | m | 56.96 | d | 55.52 | b | 59.22 | |||||||||
| 1963 | 52.16 | 59.75 | 54.46 | g | 54.88 | m | 60.75 | c | 63.79 | a | 66.48 | d | 66.61 | c | 68.25 | n | 62.74 | d | 55.89 | l | ----- | z | 61.75 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 52.84 | 53.73 | 55.18 | 57.44 | 60.31 | 63.53 | 66.61 | 67.41 | 65.99 | 61.71 | 57.12 | 54.19 | 60.11 | |||||||||||||
| S.D. | 3.88 | 3.42 | 3.63 | 3.10 | 3.68 | 3.71 | 2.94 | 3.51 | 2.96 | 2.70 | 3.45 | 2.91 | 1.92 | |||||||||||||
| SKEW | -0.23 | -0.16 | -0.31 | -0.27 | -0.77 | -1.16 | -0.52 | -0.47 | 0.24 | -0.24 | -0.83 | -0.03 | 0.08 | |||||||||||||
| MAX | 61.65 | 60.54 | 61.77 | 63.80 | 66.61 | 69.87 | 72.32 | 76.42 | 74.33 | 68.68 | 65.93 | 59.74 | 63.35 | |||||||||||||
| MIN | 43.06 | 43.54 | 44.32 | 48.23 | 49.87 | 50.87 | 58.58 | 56.94 | 59.63 | 54.55 | 44.37 | 47.90 | 56.89 | |||||||||||||
| NO YRS | 47 | 48 | 48 | 49 | 50 | 52 | 53 | 52 | 49 | 47 | 47 | 48 | 29 | |||||||||||||