| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1909 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1910 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 32.80 | k | 9999.00 | |
| 1911 | 31.44 | n | 26.46 | c | 39.19 | m | 42.07 | 45.98 | 59.32 | b | 66.95 | i | 63.50 | a | 51.96 | b | 45.93 | c | 36.60 | d | 29.71 | 44.61 | ||||
| 1912 | 33.21 | 38.56 | d | 36.84 | c | 43.50 | a | 51.43 | a | 62.25 | t | 65.32 | n | 62.24 | 53.12 | 41.70 | a | 38.73 | b | 29.75 | c | 42.91 | ||||
| 1913 | ----- | z | 31.37 | a | 37.12 | a | 44.09 | b | ----- | z | 58.38 | b | 65.19 | d | 65.33 | b | ----- | z | ----- | z | ----- | z | ----- | z | 50.24 | |
| 1914 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1915 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1916 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1917 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1918 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1919 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1920 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1921 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1922 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1923 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1924 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1925 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1926 | ----- | z | 36.00 | k | 39.50 | 48.00 | 49.47 | 62.38 | a | 66.77 | 61.65 | 46.48 | 45.03 | 39.91 | a | 29.22 | a | 48.84 | ||||||||
| 1927 | 31.68 | 31.38 | 35.06 | 39.70 | ----- | z | 57.23 | ----- | z | 59.45 | ----- | z | ----- | z | ----- | z | 19.48 | a | 39.14 | |||||||
| 1928 | 30.34 | b | 31.92 | p | 38.62 | b | 40.22 | 54.11 | 54.22 | 65.35 | 60.34 | 54.07 | 43.10 | 34.03 | 23.25 | a | 45.24 | |||||||||
| 1929 | 22.14 | j | 23.57 | a | 35.92 | 37.27 | 48.23 | 53.52 | b | 63.60 | 64.39 | 49.32 | 44.87 | 33.37 | 34.97 | 44.46 | ||||||||||
| 1930 | 12.26 | 37.20 | 37.65 | 45.67 | 46.63 | 54.68 | 63.90 | 62.85 | 52.25 | 42.69 | 31.27 | 23.10 | 42.51 | |||||||||||||
| 1931 | 29.15 | 30.12 | 35.47 | b | 42.05 | 52.40 | 55.65 | 67.40 | 64.58 | 51.40 | 44.00 | 30.85 | 24.84 | 43.99 | ||||||||||||
| 1932 | 25.97 | a | 27.52 | 38.66 | 40.82 | 48.50 | 58.43 | 61.08 | 58.89 | 54.75 | 44.85 | 38.87 | 20.35 | a | 43.22 | |||||||||||
| 1933 | 24.78 | a | 24.25 | 34.94 | 41.87 | 44.24 | 59.37 | 66.90 | 61.58 | 50.68 | e | 48.60 | 35.21 | a | 37.23 | 44.14 | ||||||||||
| 1934 | 36.15 | 37.05 | 44.29 | 49.43 | 54.18 | 55.63 | 64.39 | 65.08 | 53.35 | 47.13 | 38.48 | 28.55 | c | 47.81 | ||||||||||||
| 1935 | 26.27 | 32.30 | 31.79 | 41.25 | f | 47.79 | 57.71 | b | 62.81 | 63.15 | a | 57.17 | c | 42.65 | g | 26.85 | f | 27.28 | b | 45.14 | ||||||
| 1936 | 29.45 | 30.75 | a | 36.18 | a | 45.83 | 53.32 | 59.33 | 69.08 | 65.08 | 54.65 | 47.65 | 32.92 | 27.29 | l | 47.66 | ||||||||||
| 1937 | 14.00 | b | 29.84 | 37.50 | 39.50 | b | 50.43 | b | 56.35 | 66.23 | a | 61.16 | 55.52 | 48.53 | 38.94 | l | 33.30 | c | 44.76 | |||||||
| 1938 | 29.77 | 29.25 | 34.58 | 43.33 | 48.85 | 59.67 | 66.74 | 60.87 | 58.28 | 46.27 | a | 31.72 | 31.72 | a | 45.09 | |||||||||||
| 1939 | 30.65 | 28.70 | 38.03 | 46.70 | 52.52 | 55.20 | 66.18 | 64.60 | 55.90 | 46.40 | 36.83 | 34.63 | a | 46.36 | ||||||||||||
| 1940 | 32.75 | a | 36.53 | 39.55 | 44.72 | 53.31 | 61.37 | 63.94 | 64.87 | 54.98 | b | 47.53 | 33.57 | 31.05 | 47.01 | |||||||||||
| 1941 | 32.13 | 35.61 | 38.74 | 42.53 | 50.63 | 55.17 | 66.50 | 62.29 | 50.85 | 44.79 | 39.77 | 31.03 | 45.84 | |||||||||||||
| 1942 | 21.45 | 30.77 | 36.45 | 43.33 | 47.15 | 54.07 | 65.58 | 65.24 | 56.93 | 47.10 | 37.68 | 33.29 | 44.92 | |||||||||||||
| 1943 | 23.71 | 33.52 | 35.30 | c | 45.43 | 47.65 | 51.87 | 63.52 | 60.76 | 59.50 | 45.97 | 37.33 | 26.97 | 44.29 | ||||||||||||
| 1944 | 21.94 | 31.67 | 35.79 | 40.93 | 49.55 | 52.92 | 62.97 | 60.27 | 55.48 | 50.66 | 32.73 | 27.66 | 43.55 | |||||||||||||
| 1945 | 31.24 | 34.46 | 33.52 | 40.18 | 50.29 | 55.32 | 66.52 | 63.81 | 52.98 | 48.32 | 35.38 | 29.66 | 45.14 | |||||||||||||
| 1946 | 24.21 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 24.21 | ||
| 1947 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1949 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1950 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1951 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1952 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1953 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1954 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1955 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1956 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1957 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1958 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1959 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1960 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1961 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1962 | ----- | z | ----- | z | ----- | z | 38.58 | x | 45.22 | a | 52.64 | i | 61.23 | 58.10 | b | 55.48 | a | 44.44 | 37.75 | 33.13 | a | 47.91 | ||||
| 1963 | 24.77 | 40.34 | 35.86 | b | 37.24 | a | 51.35 | a | 54.55 | 59.08 | e | 60.47 | 59.00 | 46.48 | f | 37.16 | b | 30.13 | 44.54 | |||||||
| 1964 | 26.93 | b | 31.31 | 33.12 | e | 39.60 | a | 46.83 | d | 54.69 | a | 63.60 | e | 60.03 | b | 51.32 | e | 47.93 | b | 32.46 | c | 31.46 | d | 43.27 | ||
| 1965 | 31.95 | c | 35.20 | c | 34.59 | b | 43.21 | b | 44.78 | o | 55.31 | f | 61.68 | a | 60.55 | c | ----- | z | ----- | z | ----- | z | ----- | z | 44.53 | |
| 1966 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1967 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1968 | ----- | z | ----- | z | ----- | z | ----- | z | 48.08 | 57.22 | 65.94 | 59.82 | 54.37 | 44.26 | 35.98 | 28.11 | 49.22 | |||||||||
| 1969 | 27.97 | 28.93 | 34.84 | 40.80 | 52.16 | 58.07 | 62.00 | 61.10 | 55.98 | 39.92 | 35.42 | 31.27 | 44.04 | |||||||||||||
| 1970 | 30.63 | 34.89 | 35.16 | 34.67 | 49.45 | 59.62 | 65.08 | 62.73 | 49.82 | 41.77 | 36.68 | 24.50 | 43.75 | |||||||||||||
| 1971 | 30.52 | 31.66 | 32.47 | 40.25 | 49.47 | 54.07 | 63.94 | 65.24 | 49.38 | 41.61 | 36.38 | 26.18 | 43.43 | |||||||||||||
| 1972 | 25.89 | 33.97 | 41.52 | 39.25 | 50.45 | 58.33 | 63.10 | 62.13 | 49.33 | 43.18 | 35.10 | 21.02 | 43.60 | |||||||||||||
| 1973 | 27.63 | 34.39 | 33.85 | 40.63 | 52.32 | 57.43 | 63.73 | 61.29 | 54.43 | 43.65 | 35.45 | 33.16 | 44.83 | |||||||||||||
| 1974 | 25.68 | 33.02 | 36.48 | 40.17 | 46.47 | 62.75 | b | 62.52 | 62.84 | 56.47 | 43.58 | 37.18 | 27.77 | 44.58 | ||||||||||||
| 1975 | 27.61 | 31.04 | 33.52 | 35.65 | 48.23 | 55.22 | 67.77 | 59.94 | 55.78 | 43.34 | 33.53 | 31.53 | 43.60 | |||||||||||||
| 1976 | 31.68 | 32.34 | 33.02 | 38.77 | 50.19 | 52.73 | 64.90 | 59.16 | 57.55 | 45.16 | 37.72 | 26.76 | 44.17 | |||||||||||||
| 1977 | 23.16 | 34.02 | 33.08 | 44.63 | 44.23 | 60.70 | 62.19 | 64.90 | 53.30 | 44.92 | 35.92 | ----- | z | 45.55 | ||||||||||||
| 1978 | ----- | z | ----- | z | ----- | z | 40.30 | e | 44.82 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 42.56 | ||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 27.36 | 32.18 | 36.15 | 41.78 | 49.31 | 56.86 | 64.45 | 62.17 | 53.88 | 45.15 | 35.69 | 28.85 | 44.51 | |||||||||||||
| S.D. | 5.16 | 3.80 | 2.69 | 3.32 | 2.80 | 2.83 | 2.21 | 2.12 | 3.08 | 2.43 | 2.47 | 4.33 | 1.30 | |||||||||||||
| SKEW | -1.14 | -0.18 | 0.88 | 0.15 | -0.06 | 0.29 | -0.16 | 0.04 | -0.30 | 0.08 | -0.25 | -0.40 | 1.01 | |||||||||||||
| MAX | 36.15 | 40.34 | 44.29 | 49.43 | 54.18 | 62.75 | 69.08 | 65.33 | 59.50 | 50.66 | 39.91 | 37.23 | 47.81 | |||||||||||||
| MIN | 12.26 | 23.57 | 31.79 | 34.67 | 44.23 | 51.87 | 59.08 | 58.10 | 46.48 | 39.92 | 30.85 | 19.48 | 42.51 | |||||||||||||
| NO YRS | 32 | 33 | 34 | 35 | 35 | 34 | 34 | 37 | 34 | 32 | 32 | 33 | 22 | |||||||||||||