| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1913 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 40.73 | 40.73 | ||
| 1914 | 42.18 | 40.02 | 46.39 | 51.32 | 56.27 | 58.83 | 63.85 | 62.02 | 55.90 | 54.47 | 44.88 | 36.85 | 51.08 | |||||||||||||
| 1915 | 40.27 | 44.20 | 50.21 | 55.03 | 57.47 | 61.95 | 62.05 | a | 62.82 | 57.57 | 51.92 | 42.37 | 40.13 | 52.17 | ||||||||||||
| 1916 | 25.58 | 36.82 | a | 43.18 | 48.58 | 53.31 | 58.48 | 60.58 | 61.53 | a | 56.47 | 47.87 | ----- | z | 35.69 | b | 48.01 | |||||||||
| 1917 | 36.13 | 37.02 | 41.27 | 47.35 | 53.44 | 56.63 | 60.87 | 62.92 | 56.95 | 50.05 | 47.98 | 39.39 | 49.17 | |||||||||||||
| 1918 | 41.06 | 39.09 | 43.00 | 49.12 | 53.11 | 71.21 | b | 61.95 | 61.05 | 57.55 | 50.13 | 44.58 | 40.42 | 51.02 | ||||||||||||
| 1919 | 41.02 | 38.79 | 42.85 | 48.92 | 53.19 | 55.12 | 60.24 | 60.73 | 56.68 | 46.55 | 41.86 | a | 37.03 | 48.58 | ||||||||||||
| 1920 | 36.16 | 39.78 | 43.66 | 45.48 | 51.35 | 56.33 | 62.42 | 62.63 | 56.15 | 49.31 | 45.57 | 42.08 | 49.24 | |||||||||||||
| 1921 | 39.18 | 41.14 | 43.21 | 46.30 | 52.10 | 57.72 | 59.26 | 59.34 | 54.93 | 50.29 | b | 43.22 | 36.52 | a | 48.60 | |||||||||||
| 1922 | 34.82 | 35.50 | 42.26 | 45.83 | 53.58 | 59.40 | 60.66 | 60.08 | 56.63 | 50.81 | 41.60 | 32.98 | a | 47.85 | ||||||||||||
| 1923 | 39.10 | b | 34.20 | 42.45 | 49.07 | 54.21 | 59.37 | 63.39 | 63.60 | 57.95 | 50.10 | 42.35 | 40.73 | 49.71 | ||||||||||||
| 1924 | 37.90 | 45.09 | 43.13 | 46.95 | 55.31 | 59.23 | 62.19 | 61.92 | 56.35 | 52.19 | 43.17 | ----- | z | 51.22 | ||||||||||||
| 1925 | 42.23 | 46.57 | 46.23 | 51.32 | 57.35 | 60.82 | 64.58 | 64.21 | 58.65 | 48.87 | 45.70 | 46.28 | a | 52.73 | ||||||||||||
| 1926 | 41.23 | 46.88 | 49.15 | 55.32 | 56.61 | 63.90 | a | 65.15 | 63.21 | 53.40 | 52.32 | 46.70 | 38.97 | 52.73 | ||||||||||||
| 1927 | 37.44 | 41.46 | 42.84 | 47.28 | a | 52.06 | 59.78 | 62.48 | 62.34 | 57.28 | 51.10 | 42.58 | 32.56 | 49.10 | ||||||||||||
| 1928 | 39.00 | 41.64 | 45.98 | 49.13 | 56.06 | 59.37 | 64.05 | 61.55 | 55.08 | 49.53 | 45.15 | 38.11 | 50.39 | |||||||||||||
| 1929 | 30.53 | 33.91 | 44.11 | 48.02 | 54.18 | 58.98 | 62.50 | 62.65 | 57.13 | 52.10 | 41.50 | 37.06 | 48.56 | |||||||||||||
| 1930 | 26.87 | 41.86 | 44.15 | 51.55 | 53.18 | 57.52 | 61.24 | 63.34 | 56.47 | 47.03 | 41.60 | 39.27 | 48.67 | |||||||||||||
| 1931 | 43.45 | 41.46 | 44.87 | 50.22 | 55.45 | 58.97 | 62.16 | 60.32 | 56.40 | 49.19 | 38.95 | 38.39 | 49.99 | |||||||||||||
| 1932 | ----- | z | ----- | z | ----- | z | 48.42 | 55.55 | 60.72 | 60.50 | 62.31 | 56.93 | 51.73 | 46.22 | 35.85 | 53.14 | ||||||||||
| 1933 | 37.97 | 34.62 | 43.47 | a | 46.58 | 51.90 | 56.88 | 60.87 | 62.87 | 55.57 | 49.13 | 44.88 | 39.43 | a | 48.68 | |||||||||||
| 1934 | 42.27 | 44.14 | 47.40 | 52.91 | a | 55.73 | 59.00 | 60.89 | 62.42 | 56.05 | 51.32 | 48.16 | a | 39.87 | 51.68 | |||||||||||
| 1935 | 35.44 | 43.04 | 41.82 | 46.83 | 53.53 | 59.02 | 61.21 | 61.44 | 57.59 | a | 47.24 | 39.20 | 41.55 | 48.99 | ||||||||||||
| 1936 | 40.97 | 28.95 | 41.43 | b | 49.98 | 55.63 | 60.57 | 62.55 | a | 62.15 | 55.47 | 51.00 | 41.25 | 41.74 | 49.31 | |||||||||||
| 1937 | 25.32 | 36.86 | 46.89 | 47.55 | 53.02 | 59.20 | 62.35 | 60.77 | 57.57 | 53.13 | 44.07 | 40.19 | 48.91 | |||||||||||||
| 1938 | 38.29 | 39.52 | 43.32 | a | 49.40 | 53.63 | 59.85 | 62.56 | 60.40 | 59.32 | 50.10 | 40.92 | 39.55 | 49.74 | ||||||||||||
| 1939 | 41.66 | 36.57 | 43.08 | 49.36 | a | 54.06 | 56.68 | 61.17 | a | 61.97 | 55.97 | 50.16 | 48.76 | a | 44.50 | 50.33 | ||||||||||
| 1940 | 40.89 | 42.98 | 46.85 | 51.12 | 57.16 | 61.27 | 63.13 | 62.60 | 60.33 | 54.37 | 40.18 | 42.92 | 51.98 | |||||||||||||
| 1941 | 42.53 | 43.43 | 48.27 | 51.80 | 54.39 | 59.20 | 65.65 | 62.73 | 56.98 | 52.65 | 46.43 | 40.97 | 52.09 | |||||||||||||
| 1942 | 38.10 | 41.79 | 44.74 | 51.55 | 55.37 | 58.63 | 65.15 | 65.29 | 57.18 | 52.97 | 42.83 | 41.18 | 51.23 | |||||||||||||
| 1943 | 30.45 | 42.25 | 42.37 | 51.47 | 53.48 | a | 59.72 | 64.16 | 63.05 | 59.48 | 53.02 | 45.27 | 39.34 | 50.34 | ||||||||||||
| 1944 | 41.26 | 41.72 | 44.00 | 50.77 | 54.98 | 60.05 | 64.40 | 64.02 | 59.75 | 53.74 | 46.52 | 38.84 | 51.67 | |||||||||||||
| 1945 | 42.10 | 43.38 | 43.73 | 46.74 | a | 57.61 | 59.97 | 64.94 | 64.55 | 58.10 | 52.11 | 43.67 | a | 41.45 | 51.53 | |||||||||||
| 1946 | 42.90 | 44.41 | 45.81 | 49.28 | 57.48 | ----- | z | 64.34 | 62.34 | 59.37 | 49.60 | 42.18 | 39.47 | 50.65 | ||||||||||||
| 1947 | 35.71 | 43.29 | 47.42 | 52.07 | 58.24 | 61.53 | 64.76 | 62.95 | 58.20 | 52.42 | 44.27 | 42.47 | 51.94 | |||||||||||||
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 63.60 | 64.07 | a | 62.72 | f | 57.82 | 52.63 | 44.37 | 35.56 | 53.01 | ||||||
| 1949 | 30.47 | 34.82 | 44.32 | 50.48 | 56.57 | j | 58.42 | 61.27 | 61.29 | 58.37 | 46.68 | 48.57 | 36.61 | 48.30 | ||||||||||||
| 1950 | 20.10 | 39.23 | 41.92 | 46.53 | 51.03 | 59.80 | 62.50 | 61.47 | 56.28 | 48.84 | 41.47 | 43.21 | 47.70 | |||||||||||||
| 1951 | 36.34 | 38.88 | 37.84 | 48.40 | 54.42 | 60.38 | 63.45 | 61.73 | 57.80 | 49.02 | 41.92 | 33.53 | 48.64 | |||||||||||||
| 1952 | 32.82 | 39.29 | 41.27 | 46.40 | 53.03 | 55.20 | h | 60.27 | 60.47 | 57.35 | 51.05 | 40.05 | 40.87 | 47.53 | ||||||||||||
| 1953 | 42.42 | 41.02 | a | 43.29 | 48.17 | 54.63 | 55.98 | a | 62.24 | 62.32 | 56.85 | 52.34 | 46.71 | a | 42.15 | 50.68 | ||||||||||
| 1954 | 32.24 | 42.04 | 41.15 | 45.87 | 53.66 | 55.83 | 59.60 | 60.31 | 57.57 | 48.89 | 47.98 | 40.81 | 48.83 | |||||||||||||
| 1955 | 38.92 | 37.68 | 38.58 | 45.32 | 50.85 | 57.55 | 59.52 | 60.05 | 56.15 | 49.55 | 36.27 | 35.95 | 47.20 | |||||||||||||
| 1956 | 37.77 | 35.50 | 41.26 | 48.90 | 55.97 | 57.16 | b | 63.31 | 63.00 | 56.72 | 48.60 | 41.25 | 38.81 | 49.02 | ||||||||||||
| 1957 | 29.15 | 36.11 | 43.68 | 49.98 | b | 57.72 | f | 60.00 | 60.52 | 61.06 | 59.68 | b | 47.95 | j | 41.95 | 43.48 | d | 48.56 | ||||||||
| 1958 | 43.23 | 46.30 | 44.79 | 48.68 | 58.85 | 63.78 | 67.09 | n | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 50.94 | |||||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 37.06 | 40.07 | 43.90 | 49.12 | 54.58 | 59.50 | 62.39 | 62.09 | 57.18 | 50.61 | 43.61 | 39.40 | 50.00 | |||||||||||||
| S.D. | 5.63 | 3.92 | 2.55 | 2.40 | 2.00 | 2.72 | 1.71 | 1.30 | 1.41 | 2.04 | 2.85 | 2.99 | 1.52 | |||||||||||||
| SKEW | -1.15 | -0.46 | 0.24 | 0.54 | 0.18 | 1.88 | 0.06 | 0.07 | 0.07 | -0.12 | -0.10 | -0.28 | 0.22 | |||||||||||||
| MAX | 43.45 | 46.88 | 50.21 | 55.32 | 58.85 | 71.21 | 65.65 | 65.29 | 60.33 | 54.47 | 48.76 | 46.28 | 52.73 | |||||||||||||
| MIN | 20.10 | 28.95 | 37.84 | 45.32 | 50.85 | 55.12 | 59.26 | 59.34 | 53.40 | 46.55 | 36.27 | 32.56 | 47.20 | |||||||||||||
| NO YRS | 43 | 43 | 43 | 44 | 42 | 43 | 44 | 43 | 44 | 43 | 43 | 44 | 36 | |||||||||||||