| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1903 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 81.93 | p | 69.67 | 63.26 | 45.13 | 39.26 | 54.33 | |||||
| 1904 | 38.13 | 42.62 | 45.31 | o | 66.17 | 70.52 | 77.33 | 85.87 | 91.45 | b | 80.70 | ----- | z | ----- | z | ----- | z | 69.10 | ||||||||
| 1905 | ----- | z | ----- | z | 58.58 | g | 69.70 | 73.16 | 79.37 | ----- | z | 94.47 | a | 78.80 | 53.65 | 41.03 | ----- | z | 70.02 | |||||||
| 1906 | ----- | z | ----- | z | ----- | z | 74.25 | b | ----- | z | ----- | z | 100.90 | 92.58 | 81.87 | 64.65 | 45.50 | 39.52 | 71.32 | |||||||
| 1907 | 31.45 | 44.54 | 52.87 | 64.17 | 76.52 | 76.03 | 90.90 | 84.65 | 79.80 | 76.65 | 51.80 | 37.61 | 63.92 | |||||||||||||
| 1908 | 39.23 | 43.79 | 52.10 | 67.93 | 67.81 | 76.90 | a | 95.13 | 91.84 | 79.90 | 62.16 | 51.90 | 37.48 | 63.85 | ||||||||||||
| 1909 | 30.71 | 45.64 | 60.35 | 61.47 | 71.32 | 82.70 | 87.19 | 87.13 | 79.87 | 66.23 | 48.67 | 35.71 | 63.08 | |||||||||||||
| 1910 | 35.32 | 38.71 | 62.00 | 70.70 | 75.84 | 81.67 | 92.68 | 85.68 | 78.57 | 68.00 | 46.13 | 40.58 | 64.66 | |||||||||||||
| 1911 | 37.77 | 42.61 | 59.90 | 64.77 | 65.90 | 79.33 | 90.42 | 87.16 | 74.77 | 63.32 | 42.93 | 36.45 | 62.11 | |||||||||||||
| 1912 | 35.74 | 46.00 | 52.48 | 62.03 | 70.45 | 82.07 | 84.42 | 82.97 | 71.90 | 60.81 | 46.93 | 39.52 | 61.28 | |||||||||||||
| 1913 | 33.77 | 37.21 | 46.61 | 63.27 | 70.65 | 78.07 | 85.06 | 87.32 | 81.37 | 57.58 | 46.23 | 36.58 | 60.31 | |||||||||||||
| 1914 | 39.06 | 43.25 | 59.29 | 65.10 | 75.94 | 76.03 | 92.26 | 91.29 | 75.90 | 67.06 | 49.90 | 33.39 | 64.04 | |||||||||||||
| 1915 | 36.03 | 48.61 | 60.03 | 69.37 | 68.42 | 76.03 | 85.29 | 96.71 | 77.43 | 65.55 | 44.67 | 38.87 | 63.92 | |||||||||||||
| 1916 | 27.71 | 43.34 | 54.77 | 63.10 | 66.74 | 77.40 | 83.81 | 87.84 | 77.00 | 62.06 | 43.00 | 33.71 | 60.04 | |||||||||||||
| 1917 | 34.97 | 41.50 | 45.58 | 58.43 | 69.58 | 77.33 | 93.26 | 92.77 | 81.90 | 64.32 | 52.30 | 43.19 | 62.93 | |||||||||||||
| 1918 | 40.84 | 42.14 | 56.97 | 67.23 | 71.06 | 90.67 | 93.19 | 84.26 | 84.83 | 65.61 | c | 48.56 | c | 40.55 | k | 67.76 | ||||||||||
| 1919 | 37.20 | p | 44.50 | j | 55.16 | f | 71.19 | i | 76.97 | 87.87 | 98.13 | 93.19 | 82.00 | g | 62.97 | 49.37 | 32.81 | 71.61 | ||||||||
| 1920 | 37.16 | 53.17 | 55.87 | 60.72 | l | 75.81 | 81.77 | 100.52 | 94.90 | 85.36 | h | 59.96 | g | 51.00 | 41.00 | 65.69 | ||||||||||
| 1921 | 40.65 | 46.50 | b | 59.82 | c | 64.60 | 76.74 | 89.10 | a | 94.23 | 95.84 | 77.10 | 72.48 | 51.23 | 42.71 | 67.58 | ||||||||||
| 1922 | 34.84 | 41.54 | d | 51.68 | 61.63 | 74.29 | 91.13 | 97.29 | 94.13 | 86.50 | 69.68 | 46.75 | b | 34.55 | 65.33 | |||||||||||
| 1923 | 43.81 | 40.61 | 55.77 | 67.43 | 74.32 | 76.12 | f | 94.90 | a | 94.55 | 85.10 | 67.52 | 50.53 | 40.97 | 65.05 | |||||||||||
| 1924 | 34.39 | 50.79 | 54.29 | 66.23 | 88.42 | 86.57 | 95.00 | 90.71 | 83.07 | 65.52 | 47.27 | 32.42 | 66.22 | |||||||||||||
| 1925 | 40.48 | 48.57 | 56.42 | 73.33 | 81.00 | 85.17 | 99.13 | 93.75 | c | 81.76 | a | 63.03 | 48.70 | 44.84 | 68.02 | |||||||||||
| 1926 | 39.19 | 51.68 | 62.03 | 75.93 | a | 76.61 | 89.59 | a | 98.30 | a | 92.77 | a | 74.23 | 64.66 | b | 50.61 | b | 39.43 | c | 67.92 | ||||||
| 1927 | 38.73 | a | 48.38 | b | 54.43 | a | 66.32 | b | 69.72 | b | 84.48 | a | 96.14 | b | 93.00 | a | 73.84 | e | 65.24 | f | 49.41 | c | 32.00 | 64.22 | ||
| 1928 | 38.59 | d | 47.04 | c | 57.35 | h | 62.65 | d | 86.19 | d | 84.25 | b | 96.89 | c | 94.15 | d | 85.72 | a | 65.27 | a | 37.10 | 29.90 | 66.16 | |||
| 1929 | 32.30 | a | 36.46 | 54.97 | 62.60 | 73.97 | 78.43 | 96.29 | 99.68 | 80.03 | 70.61 | 49.00 | 43.19 | 64.80 | ||||||||||||
| 1930 | 27.00 | 48.18 | 57.10 | 73.53 | 74.03 | 81.63 | 96.52 | 97.77 | 81.90 | 60.84 | 46.24 | a | 33.94 | 64.89 | ||||||||||||
| 1931 | 41.00 | a | 46.11 | 54.71 | 65.23 | 81.06 | 86.13 | 98.81 | 96.23 | 76.53 | 61.23 | 33.90 | t | 36.48 | 67.59 | |||||||||||
| 1932 | 37.58 | 42.38 | 53.13 | 68.60 | 75.94 | 88.03 | 95.03 | 94.67 | d | 86.37 | 71.97 | 55.27 | 42.52 | h | 69.91 | |||||||||||
| 1933 | 43.45 | 39.73 | b | 57.32 | 68.04 | d | 70.61 | 84.17 | 97.81 | 95.77 | 79.27 | 68.77 | 52.57 | 45.03 | 66.88 | |||||||||||
| 1934 | 48.19 | 56.32 | 67.26 | 77.77 | 83.71 | 85.63 | 97.61 | 96.77 | 80.10 | 64.81 | 53.87 | 43.29 | 71.28 | |||||||||||||
| 1935 | 38.39 | 48.82 | 50.61 | 62.57 | 78.39 | m | 82.97 | 93.94 | 91.58 | 87.37 | 63.19 | 44.33 | 39.32 | 63.92 | ||||||||||||
| 1936 | 39.71 | 30.69 | 51.77 | 70.43 | 80.93 | b | 84.17 | 96.13 | 94.52 | 82.40 | e | 71.10 | 43.03 | 39.45 | 65.36 | |||||||||||
| 1937 | 24.52 | b | 41.11 | 58.63 | d | 59.33 | 76.74 | 81.27 | 94.48 | 89.61 | 85.27 | 67.29 | 51.67 | 42.42 | 64.36 | |||||||||||
| 1938 | 41.93 | a | 47.86 | 54.19 | 66.13 | 74.35 | 86.23 | 95.84 | 91.03 | 89.70 | 65.32 | 45.33 | 39.58 | 66.46 | ||||||||||||
| 1939 | 42.68 | 42.46 | 60.00 | f | 69.83 | 79.06 | 79.23 | 94.10 | 96.26 | 84.57 | 63.94 | 52.37 | 43.77 | 68.02 | ||||||||||||
| 1940 | 38.94 | 48.62 | 59.61 | 65.43 | 80.88 | e | 87.60 | 94.52 | 95.90 | 81.37 | 67.39 | 44.40 | 39.93 | d | 67.05 | |||||||||||
| 1941 | 42.39 | 51.54 | ----- | z | 68.80 | 73.06 | 78.93 | 94.55 | 88.65 | 70.17 | 62.71 | 50.77 | 42.45 | 65.82 | ||||||||||||
| 1942 | 36.52 | 44.81 | b | 55.65 | 69.47 | 68.58 | 76.03 | 91.94 | 93.10 | 81.57 | 67.74 | 46.40 | 41.26 | 64.42 | ||||||||||||
| 1943 | 35.21 | c | 49.36 | 52.10 | 65.67 | 68.03 | 74.37 | 89.74 | 85.71 | 84.00 | 65.81 | 48.63 | 39.06 | 63.14 | ||||||||||||
| 1944 | 40.19 | 43.26 | f | 50.19 | 64.73 | 74.52 | 79.80 | 91.16 | 87.87 | 82.07 | 71.23 | 47.50 | 41.61 | 66.44 | ||||||||||||
| 1945 | 41.61 | 47.25 | 51.16 | 60.40 | 73.48 | 79.07 | 95.74 | 94.87 | 76.40 | 68.55 | 46.57 | 38.77 | 64.49 | |||||||||||||
| 1946 | 41.97 | 48.00 | 57.55 | 70.03 | 78.65 | 80.20 | 92.00 | 94.68 | 80.20 | 60.87 | 47.17 | 40.94 | 66.02 | |||||||||||||
| 1947 | 36.71 | 49.57 | 59.97 | 68.37 | 82.58 | 80.07 | 93.68 | 89.81 | 79.50 | 63.16 | 45.53 | 41.55 | 65.87 | |||||||||||||
| 1948 | 40.16 | 44.66 | 51.52 | 63.87 | 72.52 | 84.70 | 87.42 | 86.26 | 80.13 | 63.90 | 46.37 | 33.38 | g | 65.59 | ||||||||||||
| 1949 | 25.71 | 42.50 | 55.19 | 70.83 | 78.94 | 83.23 | 91.23 | 93.68 | 81.73 | 55.69 | e | 52.13 | 37.00 | a | 63.99 | |||||||||||
| 1950 | 27.97 | a | 41.54 | 50.35 | 63.23 | 73.55 | 80.23 | 91.00 | 91.42 | 81.97 | 65.06 | 50.80 | 47.00 | 63.68 | ||||||||||||
| 1951 | 39.94 | 47.11 | 55.13 | h | 70.71 | b | 75.89 | c | 80.33 | 95.29 | 90.29 | 82.00 | c | 58.38 | b | 48.69 | a | 39.27 | a | 66.17 | ||||||
| 1952 | 37.70 | a | 47.91 | f | 53.74 | 73.70 | c | 76.23 | 80.48 | a | 93.71 | 91.45 | b | 86.66 | a | 74.68 | 47.90 | 42.00 | b | 68.93 | ||||||
| 1953 | 45.77 | 49.81 | a | 57.06 | 64.07 | c | 71.84 | 77.80 | 93.97 | 91.23 | 85.97 | 69.03 | b | 50.69 | a | 43.87 | 66.76 | |||||||||
| 1954 | 40.20 | a | 52.48 | a | 54.32 | 64.20 | 77.42 | 78.63 | 90.94 | 84.68 | 80.50 | 64.35 | 54.21 | a | 41.54 | e | 65.29 | |||||||||
| 1955 | 39.76 | b | 44.86 | 48.03 | 59.53 | 70.45 | 83.83 | 88.06 | 94.61 | 79.87 | 64.11 | c | 40.00 | a | 38.29 | 62.62 | ||||||||||
| 1956 | 38.26 | 40.86 | 53.29 | 70.67 | 76.77 | 80.40 | 94.61 | 89.68 | 82.82 | b | 63.83 | b | 47.86 | b | 43.13 | 65.18 | ||||||||||
| 1957 | 30.55 | 48.12 | d | 54.87 | 65.40 | 73.81 | 85.20 | 92.00 | a | 89.00 | c | 87.61 | b | 64.26 | d | 47.15 | d | 42.00 | a | 65.00 | ||||||
| 1958 | 43.47 | a | 52.04 | a | 55.54 | c | 63.44 | c | 84.61 | 85.87 | 94.19 | 95.71 | 79.39 | b | 68.66 | b | 48.69 | a | 43.73 | a | 67.94 | |||||
| 1959 | 40.87 | 45.75 | 54.65 | 66.72 | a | 71.32 | 82.77 | 95.42 | 88.35 | 71.26 | g | 62.58 | 45.62 | a | 41.42 | 63.22 | ||||||||||
| 1960 | 35.26 | 44.59 | 58.64 | c | 65.73 | 71.87 | 84.73 | 98.23 | 85.68 | 84.00 | 65.32 | 49.90 | 38.97 | 65.24 | ||||||||||||
| 1961 | 40.74 | 47.14 | 55.87 | 63.47 | 74.55 | 91.70 | 96.45 | 99.52 | 76.37 | 62.00 | 45.85 | d | 38.52 | 66.01 | ||||||||||||
| 1962 | 36.90 | 46.29 | 52.90 | 70.07 | 69.10 | 83.20 | 90.71 | 88.65 | 82.97 | 62.35 | 51.33 | 43.16 | 64.80 | |||||||||||||
| 1963 | 33.52 | 48.25 | 57.58 | 62.77 | 77.84 | 80.90 | 90.26 | 93.77 | 88.63 | 69.26 | 49.27 | 39.87 | 65.99 | |||||||||||||
| 1964 | 40.68 | 47.52 | 52.48 | 62.50 | 74.03 | 80.87 | 90.90 | 84.61 | 76.07 | 65.13 | 46.27 | 36.42 | 63.12 | |||||||||||||
| 1965 | 39.19 | 46.43 | 54.35 | 67.47 | 71.97 | 81.37 | 91.42 | 87.58 | 74.20 | 67.77 | 51.03 | 41.77 | 64.55 | |||||||||||||
| 1966 | 41.35 | 46.18 | 55.84 | 65.13 | 78.84 | 78.03 | 90.87 | 91.03 | 84.63 | 62.10 | 49.50 | 43.00 | 65.54 | |||||||||||||
| 1967 | 44.03 | 49.04 | 50.87 | 59.67 | 71.42 | 83.07 | 94.35 | 98.29 | 87.37 | 62.71 | 49.87 | 38.03 | 65.73 | |||||||||||||
| 1968 | 38.77 | 51.45 | 59.84 | 60.60 | 72.35 | 79.83 | 93.23 | 85.00 | 76.40 | 61.16 | 48.00 | 36.81 | 63.62 | |||||||||||||
| 1969 | 32.45 | 43.86 | 55.94 | 64.93 | 76.81 | 84.60 | 90.39 | 91.97 | 78.73 | 58.81 | 49.77 | 39.74 | 64.00 | |||||||||||||
| 1970 | 38.87 | 53.71 | 54.58 | 58.80 | 76.32 | 85.77 | 93.97 | 97.23 | 71.90 | 62.58 | 48.37 | 38.39 | 65.04 | |||||||||||||
| 1971 | 39.42 | 48.25 | 52.13 | 66.27 | 77.74 | 77.23 | 92.16 | 97.97 | 76.10 | 63.16 | 45.90 | 38.00 | 64.53 | |||||||||||||
| 1972 | 38.03 | 44.52 | 58.10 | 60.03 | 77.97 | 82.67 | 89.90 | 93.97 | 74.43 | 63.97 | 47.87 | 33.87 | 63.78 | |||||||||||||
| 1973 | 36.74 | 49.25 | 56.71 | 65.53 | 78.45 | 82.83 | 95.55 | 92.19 | 79.70 | 62.06 | 43.90 | 41.94 | 65.41 | |||||||||||||
| 1974 | 35.26 | 48.25 | 55.16 | 63.40 | 70.94 | 87.37 | 91.00 | 91.39 | 85.17 | 69.00 | 49.73 | 42.32 | 65.75 | |||||||||||||
| 1975 | 38.06 | 43.36 | 52.35 | 58.40 | 68.26 | 76.00 | 92.29 | 83.58 | 81.17 | 59.23 | 46.50 | 38.71 | 61.49 | |||||||||||||
| 1976 | 39.42 | 45.97 | 49.84 | 62.07 | 75.55 | 74.47 | 87.55 | 83.71 | 82.43 | 65.13 | 49.63 | 38.19 | 62.83 | |||||||||||||
| 1977 | 35.29 | 49.46 | 50.90 | 70.67 | 66.71 | 85.87 | 86.84 | 91.97 | 72.90 | 61.45 | 45.00 | 39.90 | 63.08 | |||||||||||||
| 1978 | 38.94 | 47.57 | 59.16 | 62.37 | 65.23 | 81.90 | 87.81 | 85.10 | 74.80 | 66.87 | 42.70 | 34.58 | 62.25 | |||||||||||||
| 1979 | 27.84 | 41.25 | 57.45 | 60.83 | 72.71 | 82.30 | 90.94 | 90.68 | 83.60 | 65.71 | 46.23 | 42.13 | 63.47 | |||||||||||||
| 1980 | 35.58 | 44.93 | 51.03 | 67.23 | 70.39 | 75.23 | 86.90 | 84.00 | 76.73 | 66.13 | 48.60 | 42.42 | 62.43 | |||||||||||||
| 1981 | 42.68 | 46.89 | 59.72 | b | ----- | z | ----- | z | ----- | z | 86.19 | 94.45 | 81.53 | ----- | z | ----- | z | 42.11 | l | 68.58 | ||||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 37.58 | 45.91 | 55.13 | 65.83 | 74.49 | 81.98 | 92.81 | 91.39 | 80.38 | 64.87 | 47.93 | 39.46 | 64.64 | |||||||||||||
| S.D. | 4.65 | 4.30 | 3.84 | 4.27 | 4.77 | 4.15 | 3.91 | 4.27 | 4.48 | 4.01 | 3.31 | 3.46 | 1.99 | |||||||||||||
| SKEW | -0.76 | -0.54 | 0.19 | 0.47 | 0.47 | 0.27 | -0.32 | -0.25 | -0.25 | 0.20 | -0.48 | -0.53 | 0.37 | |||||||||||||
| MAX | 48.19 | 56.32 | 67.26 | 77.77 | 88.42 | 91.70 | 100.90 | 99.68 | 89.70 | 76.65 | 55.27 | 47.00 | 71.28 | |||||||||||||
| MIN | 24.52 | 30.69 | 45.58 | 58.40 | 65.23 | 74.37 | 83.81 | 82.97 | 69.67 | 53.65 | 37.10 | 29.90 | 60.04 | |||||||||||||
| NO YRS | 75 | 73 | 70 | 75 | 75 | 75 | 77 | 78 | 76 | 75 | 76 | 73 | 58 | |||||||||||||