| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1905 | ----- | z | ----- | z | 45.16 | 46.33 | 45.90 | 49.67 | 53.16 | 53.39 | 52.43 | 47.87 | 43.83 | 43.29 | 48.10 | |||||||||||
| 1906 | 43.23 | 44.46 | 42.06 | 45.17 | 46.48 | 49.63 | 53.39 | 51.52 | 51.03 | 49.61 | 45.77 | 44.35 | 47.23 | |||||||||||||
| 1907 | 40.65 | 45.43 | 40.42 | 44.53 | 47.32 | 49.30 | 52.52 | 51.52 | 50.67 | 50.84 | 46.07 | 45.68 | 47.08 | |||||||||||||
| 1908 | 43.97 | 39.93 | 40.26 | 42.73 | 43.68 | 47.63 | 51.52 | 49.35 | 49.43 | 46.97 | 47.03 | 42.28 | b | 45.40 | ||||||||||||
| 1909 | 41.23 | 41.22 | a | 41.03 | 43.10 | a | 43.77 | 47.67 | 50.87 | 52.29 | 49.73 | 49.19 | 44.34 | a | 39.03 | 45.29 | ||||||||||
| 1910 | 38.25 | w | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 41.29 | 41.29 | ||
| 1911 | 37.10 | 34.50 | 39.94 | 39.23 | 44.19 | 46.80 | 49.94 | 51.16 | 48.80 | 46.35 | 41.40 | 35.90 | 42.94 | |||||||||||||
| 1912 | 41.84 | 41.03 | 32.06 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 38.31 | ||||
| 1913 | ----- | z | 35.18 | 39.35 | 41.20 | 45.23 | 48.93 | 52.13 | 52.55 | 49.40 | 46.77 | 44.07 | 39.16 | 44.91 | ||||||||||||
| 1914 | 42.48 | 40.57 | 43.13 | 44.30 | 46.19 | 48.73 | 51.00 | 52.13 | 49.90 | 47.94 | 42.97 | 37.16 | 45.54 | |||||||||||||
| 1915 | 38.74 | 40.57 | 43.10 | 44.57 | 47.35 | 49.83 | 52.48 | 51.29 | 50.27 | 47.38 | b | 39.72 | a | 38.19 | 45.29 | |||||||||||
| 1916 | 32.84 | 40.59 | 38.65 | 41.13 | 40.03 | a | 42.30 | 49.06 | 46.94 | ----- | z | ----- | z | ----- | z | ----- | z | 41.44 | ||||||||
| 1917 | 37.10 | 34.14 | 34.81 | 38.47 | 40.35 | 41.07 | a | 48.77 | 48.32 | ----- | z | 46.26 | 34.47 | 40.39 | 40.38 | |||||||||||
| 1918 | 41.81 | 39.04 | 41.03 | 37.03 | 37.90 | 45.53 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 38.73 | a | 40.15 | |||||||
| 1919 | 39.16 | 40.79 | 40.97 | 40.20 | 42.42 | 44.07 | 46.26 | 47.77 | 45.97 | 39.77 | 34.63 | 34.65 | 41.39 | |||||||||||||
| 1920 | 34.42 | 31.52 | 35.35 | 35.67 | 36.10 | 42.37 | 45.13 | 49.39 | 51.03 | 48.87 | 44.10 | 43.42 | 41.45 | |||||||||||||
| 1921 | 40.42 | 41.79 | 42.58 | 42.23 | 43.90 | 50.53 | 50.58 | 50.94 | 49.13 | 48.23 | 45.53 | 42.39 | 45.69 | |||||||||||||
| 1922 | 34.45 | 35.86 | 36.42 | 39.30 | 43.48 | 50.07 | 49.84 | 50.90 | 50.40 | ----- | z | ----- | z | ----- | z | 43.41 | ||||||||||
| 1923 | ----- | z | ----- | z | 38.50 | g | 42.77 | 45.00 | 47.90 | 53.19 | 52.94 | 50.87 | 46.03 | 45.33 | 39.39 | 47.05 | ||||||||||
| 1924 | 39.68 | 43.52 | 39.32 | 42.67 | 46.23 | 48.23 | 49.81 | 53.39 | 49.00 | 46.71 | 44.07 | 38.65 | 45.10 | |||||||||||||
| 1925 | 42.87 | 42.89 | 39.77 | 44.47 | 46.00 | 48.77 | 51.68 | 49.77 | 49.63 | 46.26 | 44.03 | 43.61 | 45.81 | |||||||||||||
| 1926 | 41.52 | 44.89 | 43.94 | 47.35 | g | 48.37 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 44.68 | ||||
| 1927 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 52.06 | 50.06 | 48.70 | 46.19 | 46.10 | 36.94 | 46.68 | |||||||
| 1928 | 42.55 | 40.03 | 45.35 | 43.50 | 45.84 | 49.10 | 52.68 | 51.77 | 49.33 | 45.87 | 42.47 | 39.29 | 45.65 | |||||||||||||
| 1929 | 36.58 | 33.36 | 39.29 | 40.17 | 43.87 | 48.43 | 50.35 | 51.48 | 47.60 | 45.61 | 39.77 | 42.71 | 43.27 | |||||||||||||
| 1930 | 35.32 | 42.07 | 40.81 | 44.73 | 43.06 | 47.50 | 50.39 | 53.06 | 50.00 | 45.16 | 42.03 | 39.35 | 44.46 | |||||||||||||
| 1931 | 40.90 | 40.57 | 42.52 | 43.50 | 47.23 | 49.30 | 52.10 | 50.42 | 48.37 | 46.87 | 38.33 | 39.39 | 44.96 | |||||||||||||
| 1932 | 36.35 | 37.72 | 42.52 | 41.27 | 46.10 | 48.63 | 50.23 | 51.00 | 48.23 | 44.94 | 44.63 | 36.16 | 43.98 | |||||||||||||
| 1933 | 36.39 | 35.64 | 40.81 | 41.03 | 43.68 | 47.77 | 50.71 | 50.23 | 48.53 | 46.90 | 39.60 | 45.20 | f | 43.75 | ||||||||||||
| 1934 | 42.71 | j | 43.23 | b | 44.93 | d | 44.58 | d | 48.62 | e | 48.77 | 52.16 | f | ----- | z | ----- | z | ----- | z | ----- | z | 42.42 | 45.42 | |||
| 1935 | 39.61 | 41.07 | 37.43 | h | 48.27 | h | 45.23 | 49.31 | a | 50.56 | d | 51.62 | b | 50.46 | b | 43.96 | g | 44.36 | b | 44.41 | d | 46.29 | ||||
| 1936 | 43.91 | i | 40.60 | n | 39.40 | a | 44.60 | 48.94 | 53.07 | 54.97 | 53.81 | 50.50 | 47.13 | 41.33 | 41.03 | 47.48 | ||||||||||
| 1937 | 32.87 | 39.14 | 42.84 | 41.77 | 45.65 | 51.40 | 53.10 | 52.32 | 51.70 | 49.90 | 48.23 | 44.16 | 46.09 | |||||||||||||
| 1938 | 42.48 | 41.46 | 41.45 | 43.80 | 45.97 | 50.33 | 51.29 | 51.23 | 51.50 | 47.52 | 40.93 | 41.03 | 45.75 | |||||||||||||
| 1939 | 40.70 | a | 38.64 | 41.87 | 43.30 | 46.61 | 49.60 | 52.03 | 52.32 | 50.69 | a | 49.55 | 43.75 | b | 46.55 | 46.30 | ||||||||||
| 1940 | 43.45 | 44.62 | 43.97 | 45.07 | 49.10 | 49.30 | 52.74 | 53.29 | 52.63 | 50.96 | c | 43.30 | 43.19 | 47.64 | ||||||||||||
| 1941 | 44.06 | 46.68 | 42.52 | 45.00 | 47.32 | 51.41 | a | 54.46 | c | 52.71 | 50.77 | 46.97 | 46.17 | 41.83 | a | 47.49 | ||||||||||
| 1942 | 40.65 | 38.79 | 38.00 | g | ----- | z | ----- | z | 50.37 | 55.00 | 53.48 | ----- | z | ----- | z | ----- | z | ----- | z | 47.66 | ||||||
| 1943 | ----- | z | ----- | z | ----- | z | 43.67 | 44.58 | 47.93 | 49.77 | 51.00 | 50.57 | 48.35 | 47.17 | 43.45 | 47.39 | ||||||||||
| 1944 | 41.84 | 39.55 | 39.55 | 42.60 | 44.77 | 48.30 | 50.87 | 51.74 | 48.67 | 48.42 | 45.87 | 45.97 | 45.68 | |||||||||||||
| 1945 | 44.32 | 41.89 | 40.84 | 41.90 | 46.65 | 47.93 | 49.13 | 49.39 | 48.77 | 45.68 | 44.23 | 42.81 | 45.29 | |||||||||||||
| 1946 | 39.84 | 39.82 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 39.83 | |||
| 1947 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 48.25 | z | 52.19 | 52.16 | 47.90 | 47.81 | d | ----- | z | ----- | z | 50.02 | ||||
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 52.13 | 53.48 | 48.67 | 46.23 | a | 41.13 | 36.55 | 46.37 | ||||||
| 1949 | 30.81 | 39.39 | 42.65 | 43.93 | 47.55 | 47.97 | 50.42 | 51.39 | 50.30 | 44.42 | 44.59 | c | 39.39 | 44.40 | ||||||||||||
| 1950 | 36.16 | 39.96 | 40.55 | 42.17 | 44.13 | 49.04 | b | 52.26 | d | 55.55 | 50.10 | 50.45 | 45.10 | a | ----- | z | 45.95 | |||||||||
| 1951 | ----- | z | 39.50 | h | 38.26 | 42.53 | 44.97 | 45.23 | 48.65 | 51.00 | 48.90 | 47.19 | 45.10 | 39.16 | 45.10 | |||||||||||
| 1952 | 37.52 | 39.55 | 38.38 | e | 42.37 | 45.48 | 47.73 | 48.19 | 49.61 | 48.97 | 44.68 | 38.50 | b | 40.77 | 43.48 | |||||||||||
| 1953 | 45.45 | 38.93 | 40.97 | 40.23 | 46.03 | 46.97 | 50.68 | 51.94 | 54.07 | a | 49.39 | 46.50 | 43.58 | 46.23 | ||||||||||||
| 1954 | 38.26 | 42.07 | 39.45 | 40.57 | 43.97 | 47.87 | 50.77 | 49.71 | 52.47 | 47.87 | 46.83 | ----- | z | 45.44 | ||||||||||||
| 1955 | 36.87 | 40.36 | 34.20 | a | 36.75 | v | ----- | z | ----- | z | 49.58 | 49.71 | 49.77 | 45.23 | 41.83 | 40.77 | 43.15 | |||||||||
| 1956 | 41.52 | 36.69 | 39.58 | 41.77 | 45.77 | 48.87 | 52.00 | 51.07 | a | 48.27 | 46.74 | 42.83 | 40.68 | 44.65 | ||||||||||||
| 1957 | 36.23 | 42.39 | 43.35 | 43.03 | 47.55 | 52.00 | 55.16 | 53.87 | 53.93 | 49.71 | 43.63 | 42.77 | 46.97 | |||||||||||||
| 1958 | 44.00 | 45.46 | 39.55 | 42.40 | 46.45 | 51.63 | 49.90 | 51.32 | 51.23 | 47.84 | 44.33 | 46.29 | 46.70 | |||||||||||||
| 1959 | 42.32 | 40.64 | 41.74 | 44.40 | 45.68 | 50.53 | 48.71 | 47.77 | 49.83 | 48.84 | 44.87 | 42.00 | 45.61 | |||||||||||||
| 1960 | 39.84 | 40.00 | 42.00 | 41.83 | 43.74 | 49.03 | 47.31 | b | 51.23 | 48.63 | 48.26 | 42.93 | 43.61 | 44.87 | ||||||||||||
| 1961 | 44.42 | 43.25 | 42.39 | 42.52 | a | 46.61 | 48.87 | 53.13 | 51.48 | 50.43 | 45.84 | 41.57 | 41.94 | 46.04 | ||||||||||||
| 1962 | 37.19 | 41.59 | a | 40.97 | 43.13 | 45.90 | 49.07 | 51.13 | 53.71 | 51.50 | 48.94 | m | 46.31 | d | 44.69 | b | 45.93 | |||||||||
| 1963 | 39.42 | 46.75 | 39.83 | g | 40.35 | m | 46.46 | c | 48.59 | c | 52.96 | d | 50.04 | c | 52.12 | n | 48.81 | d | 45.44 | l | ----- | z | 47.58 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 39.61 | 40.39 | 40.65 | 42.43 | 45.17 | 48.45 | 51.11 | 51.35 | 49.99 | 47.30 | 43.37 | 41.26 | 45.26 | |||||||||||||
| S.D. | 3.47 | 3.33 | 2.74 | 2.16 | 2.51 | 2.32 | 2.07 | 1.72 | 1.57 | 1.98 | 2.97 | 2.89 | 1.51 | |||||||||||||
| SKEW | -0.49 | -0.45 | -0.95 | -0.94 | -1.47 | -1.19 | -0.40 | -0.30 | 0.40 | -0.88 | -1.12 | -0.25 | -0.85 | |||||||||||||
| MAX | 45.45 | 46.75 | 45.35 | 46.33 | 49.10 | 53.07 | 55.16 | 55.55 | 54.07 | 50.96 | 48.23 | 46.55 | 47.64 | |||||||||||||
| MIN | 30.81 | 31.52 | 32.06 | 35.67 | 36.10 | 41.07 | 45.13 | 46.94 | 45.97 | 39.77 | 34.47 | 34.65 | 41.39 | |||||||||||||
| NO YRS | 48 | 50 | 49 | 48 | 51 | 51 | 53 | 53 | 49 | 48 | 48 | 48 | 33 | |||||||||||||