| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1911 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 38.73 | 32.19 | 35.46 | |||
| 1912 | 27.43 | b | 37.62 | 42.48 | 50.72 | 58.13 | 69.25 | 72.45 | 70.18 | 57.63 | 48.06 | 41.02 | 29.19 | 50.35 | ||||||||||||
| 1913 | 23.08 | 28.32 | 39.44 | 53.23 | 61.02 | 68.43 | 73.65 | 75.69 | 63.83 | 48.81 | 41.30 | 30.56 | 50.61 | |||||||||||||
| 1914 | 30.55 | 34.21 | 45.32 | a | 52.83 | 62.66 | b | 65.78 | 77.48 | 74.42 | 60.30 | 52.84 | 37.42 | 19.83 | b | 51.14 | ||||||||||
| 1915 | 22.66 | 39.25 | b | 47.94 | 60.60 | y | 57.19 | 65.62 | 73.63 | 80.15 | 62.52 | e | 53.31 | 36.83 | a | 29.47 | a | 51.69 | ||||||||
| 1916 | 22.13 | 31.18 | j | 44.73 | 53.22 | 54.10 | 63.73 | 72.56 | e | 76.93 | x | 61.00 | f | 48.73 | i | 34.33 | a | 25.77 | 46.32 | |||||||
| 1917 | 17.92 | 29.54 | b | 33.55 | b | 47.83 | 57.87 | 65.63 | c | 80.27 | 76.58 | a | 66.22 | 52.84 | 40.58 | 39.62 | c | 50.71 | ||||||||
| 1918 | 32.82 | 34.59 | 45.56 | 50.45 | 58.02 | 75.95 | 76.24 | 69.79 | 67.03 | 54.31 | 38.48 | 25.77 | 52.42 | |||||||||||||
| 1919 | 27.68 | 36.21 | b | 44.42 | 53.63 | 61.88 | a | 68.07 | 78.34 | 76.10 | 64.52 | 46.39 | 35.58 | 17.79 | 50.88 | |||||||||||
| 1920 | 22.81 | 35.84 | 42.71 | 48.43 | 57.40 | 66.48 | 77.05 | 75.02 | 62.98 | 48.92 | 39.03 | 32.56 | 50.77 | |||||||||||||
| 1921 | 31.16 | 33.70 | 45.02 | 48.82 | 60.76 | 71.08 | 77.18 | 76.47 | 59.38 | 54.23 | 42.85 | 31.82 | 52.70 | |||||||||||||
| 1922 | 17.47 | 30.21 | 39.44 | 48.10 | a | 58.84 | 72.40 | 78.71 | 77.71 | 67.69 | a | 54.50 | 36.23 | 26.84 | 50.68 | |||||||||||
| 1923 | 32.42 | 29.30 | 41.08 | 51.43 | 59.42 | 65.58 | 79.15 | 76.65 | 66.98 | a | 51.16 | 39.68 | 28.42 | 51.77 | ||||||||||||
| 1924 | 21.11 | 41.47 | 41.00 | 51.23 | 66.89 | 70.08 | 77.55 | a | 74.26 | 65.32 | 53.15 | 39.40 | 19.65 | 51.76 | ||||||||||||
| 1925 | 25.16 | 37.68 | 45.37 | 54.05 | 63.60 | 69.40 | 81.12 | b | 74.05 | 65.00 | 51.19 | 39.83 | 34.39 | 53.40 | ||||||||||||
| 1926 | 28.89 | 41.56 | a | 46.58 | 56.83 | 59.10 | a | 69.58 | 77.66 | 72.66 | c | 55.41 | b | 53.00 | 42.97 | 29.74 | d | 52.83 | ||||||||
| 1927 | 28.34 | 38.59 | 43.37 | a | 49.09 | a | 57.12 | b | 68.22 | 76.19 | 73.19 | 61.58 | e | 51.45 | a | 44.40 | 22.69 | 51.19 | ||||||||
| 1928 | 27.76 | 32.69 | 45.47 | 49.78 | a | 66.74 | f | 68.08 | 76.74 | 71.47 | a | 63.82 | 51.81 | 40.68 | 24.42 | 50.25 | ||||||||||
| 1929 | 17.92 | 23.55 | 43.90 | 48.85 | 60.02 | 65.27 | 75.79 | 77.16 | 59.82 | 52.74 | 36.33 | 34.16 | 49.63 | |||||||||||||
| 1930 | 15.98 | 38.86 | 46.76 | 56.30 | 58.63 | 66.12 | 78.02 | 76.02 | 63.35 | 49.95 | 35.20 | 23.32 | a | 50.71 | ||||||||||||
| 1931 | 26.60 | 33.64 | 44.05 | 52.18 | 62.71 | 69.45 | 78.58 | 75.32 | 63.66 | a | 53.52 | 36.65 | 26.00 | 51.86 | ||||||||||||
| 1932 | 21.57 | j | 27.17 | 42.71 | 52.42 | 60.40 | 69.35 | 74.60 | 71.76 | 64.58 | 52.26 | 40.78 | 23.73 | 52.71 | ||||||||||||
| 1933 | 27.63 | 18.66 | 40.16 | 50.45 | a | 55.90 | b | 70.38 | 76.52 | 73.61 | 62.10 | a | 56.31 | 40.53 | 38.27 | 50.88 | ||||||||||
| 1934 | 37.97 | 43.95 | 50.44 | 58.90 | 66.79 | 69.25 | 76.74 | 73.95 | 62.50 | 53.81 | 44.72 | 31.37 | 55.86 | |||||||||||||
| 1935 | 29.42 | 33.46 | 41.23 | 51.33 | 60.52 | 69.33 | 76.90 | 74.61 | 67.87 | 52.81 | 33.83 | 27.50 | 51.57 | |||||||||||||
| 1936 | 28.79 | 25.17 | 40.15 | 55.60 | 65.05 | 70.72 | 79.44 | 75.87 | 62.88 | 54.89 | 34.32 | 32.05 | 52.08 | |||||||||||||
| 1937 | 12.42 | 29.30 | 44.02 | 50.65 | 62.50 | 66.62 | 79.23 | 73.00 | 65.97 | 54.45 | 44.00 | 36.15 | 51.52 | |||||||||||||
| 1938 | 34.44 | 39.38 | 42.40 | 52.57 | 58.08 | 68.87 | 76.00 | 71.98 | 67.05 | 52.71 | 35.42 | 33.37 | 52.69 | |||||||||||||
| 1939 | 33.50 | 31.57 | 44.85 | 54.67 | 63.10 | 64.53 | 76.55 | 74.82 | c | 63.02 | 50.89 | 38.93 | 36.89 | 52.78 | ||||||||||||
| 1940 | 32.87 | 37.93 | 45.27 | 51.42 | 60.65 | 69.27 | d | 73.59 | i | 72.21 | 63.44 | f | 54.18 | 36.33 | 33.10 | 49.32 | ||||||||||
| 1941 | 32.31 | 39.14 | 47.13 | 53.79 | d | 61.32 | 66.77 | 77.52 | 75.15 | 60.60 | a | 51.34 | 41.48 | 35.24 | 53.48 | |||||||||||
| 1942 | 22.65 | 32.75 | 41.79 | 54.70 | 57.84 | 65.82 | 79.10 | a | 75.44 | 65.57 | 53.60 | 39.37 | 32.98 | c | 51.80 | |||||||||||
| 1943 | 29.77 | 33.55 | 42.23 | a | 55.78 | 57.69 | 63.67 | 75.89 | 72.60 | 67.82 | 55.31 | 39.20 | 33.44 | 52.25 | ||||||||||||
| 1944 | 21.21 | 38.81 | 43.31 | m | 53.20 | 60.87 | 65.50 | 72.73 | 70.53 | 63.33 | 54.84 | 39.53 | 28.18 | 51.70 | ||||||||||||
| 1945 | 30.16 | 38.07 | 42.35 | 49.67 | 59.31 | 64.33 | 74.52 | 72.37 | 59.42 | 52.66 | 38.85 | 31.03 | 51.06 | |||||||||||||
| 1946 | 27.47 | 32.09 | 44.19 | 53.50 | 60.11 | 65.28 | 75.37 | 73.40 | 60.00 | 46.56 | 38.82 | 36.00 | a | 51.07 | ||||||||||||
| 1947 | 23.31 | 39.11 | 47.23 | 51.72 | 64.15 | 63.88 | 74.90 | 70.92 | 61.87 | 53.74 | 38.58 | 32.90 | a | 51.86 | ||||||||||||
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 70.37 | 60.87 | 50.95 | 37.08 | 21.56 | 48.17 | ||||||
| 1949 | 8.34 | 29.50 | 45.39 | 55.28 | 63.60 | 67.38 | 74.69 | 73.52 | 65.28 | 45.82 | 40.88 | 30.73 | 50.03 | |||||||||||||
| 1950 | 23.34 | 30.50 | 40.98 | 49.37 | 56.39 | 64.87 | 74.05 | 73.06 | 63.98 | 56.06 | 41.35 | 37.15 | 50.92 | |||||||||||||
| 1951 | 28.79 | 34.35 | b | 39.11 | 52.64 | a | 58.74 | 63.77 | 75.26 | 71.21 | 62.83 | 49.13 | 37.15 | 30.00 | e | 50.25 | ||||||||||
| 1952 | 25.60 | 26.71 | 38.11 | 53.67 | 60.90 | 66.09 | a | 73.21 | 72.68 | 64.47 | 54.69 | 34.70 | 32.55 | 50.28 | ||||||||||||
| 1953 | 39.45 | a | 38.29 | 44.22 | a | 49.59 | b | 54.35 | 61.98 | 74.98 | 71.05 | 65.12 | a | 52.82 | a | 43.00 | 31.94 | 52.23 | ||||||||
| 1954 | 36.15 | 39.06 | b | 41.65 | 51.42 | 61.43 | a | 61.75 | 73.47 | 68.35 | 60.75 | 48.50 | 41.67 | 28.63 | 51.07 | |||||||||||
| 1955 | 21.21 | 23.98 | 36.29 | 46.28 | 57.11 | 68.10 | 72.60 | 71.90 | 60.53 | 50.58 | 33.40 | 31.32 | 47.78 | |||||||||||||
| 1956 | 30.35 | 26.88 | 43.34 | 52.50 | 61.03 | 64.92 | 75.48 | 70.81 | 61.63 | 48.39 | 34.55 | 29.89 | 49.98 | |||||||||||||
| 1957 | 18.15 | 29.31 | a | 43.47 | 50.62 | 59.92 | 66.88 | 71.45 | 68.48 | 62.55 | 49.05 | 34.25 | j | 33.08 | 50.27 | |||||||||||
| 1958 | 26.89 | 38.79 | b | 40.84 | 48.41 | a | 63.65 | 68.12 | 73.24 | 74.65 | 61.07 | 51.58 | 38.47 | 35.40 | 51.76 | |||||||||||
| 1959 | 34.32 | 37.50 | 42.02 | 51.58 | 55.02 | 68.68 | 75.26 | 69.35 | 60.12 | 50.55 | 35.92 | 29.77 | 50.84 | |||||||||||||
| 1960 | 25.32 | 34.03 | 43.50 | 51.30 | 56.23 | a | 68.38 | 77.35 | 66.76 | 62.62 | 47.66 | 39.33 | 28.44 | 50.08 | ||||||||||||
| 1961 | 28.92 | 40.14 | 44.60 | 49.97 | 59.13 | 72.62 | 75.19 | 75.87 | 58.23 | 48.37 | 35.30 | 30.19 | 51.54 | |||||||||||||
| 1962 | 21.71 | 31.48 | 40.73 | 52.67 | 57.00 | 66.47 | 72.42 | 69.89 | 62.20 | 50.71 | 40.58 | 34.47 | 50.03 | |||||||||||||
| 1963 | 25.05 | 41.07 | 44.08 | 48.18 | 59.97 | 64.65 | 69.18 | 71.60 | 66.27 | ----- | z | 40.30 | 26.29 | 50.60 | ||||||||||||
| 1964 | 24.08 | ----- | z | 38.19 | 48.55 | 56.37 | 63.28 | 72.98 | 67.18 | 58.62 | 50.31 | 37.47 | 31.42 | 49.86 | ||||||||||||
| 1965 | 29.81 | 35.64 | 39.08 | 52.60 | 56.31 | 64.95 | 72.10 | 69.24 | 56.05 | 51.81 | 42.22 | 30.45 | 50.02 | |||||||||||||
| 1966 | 34.50 | 35.93 | 43.29 | 49.80 | 61.40 | 64.72 | 71.98 | 70.97 | 65.00 | 47.15 | 41.83 | 30.95 | 51.46 | |||||||||||||
| 1967 | 34.24 | 37.41 | 42.31 | 46.02 | 56.21 | 65.32 | 74.97 | 74.31 | 65.57 | 48.47 | 39.72 | 24.53 | 50.75 | |||||||||||||
| 1968 | 25.52 | 39.76 | 45.97 | 47.67 | ----- | z | 67.67 | 75.32 | 67.87 | 60.58 | 48.42 | 40.23 | 31.03 | 50.00 | ||||||||||||
| 1969 | 29.24 | 31.57 | 40.79 | 51.82 | 61.52 | 66.63 | 71.63 | 70.74 | 63.33 | 46.44 | 36.72 | 33.76 | 50.35 | |||||||||||||
| 1970 | 34.05 | 39.68 | 42.16 | 45.07 | 58.06 | 68.53 | 73.82 | 72.37 | 56.62 | 46.32 | 40.28 | 30.84 | 50.65 | |||||||||||||
| 1971 | 31.45 | 36.52 | 39.21 | 49.57 | 59.39 | 62.90 | 73.69 | 75.11 | 56.95 | 48.60 | 38.15 | 26.98 | 49.88 | |||||||||||||
| 1972 | 27.53 | 31.67 | 45.55 | 48.22 | 60.06 | 68.17 | 71.37 | 72.85 | 57.65 | 51.56 | 39.77 | 21.21 | 49.63 | |||||||||||||
| 1973 | 28.65 | 37.89 | 43.73 | 49.90 | 59.53 | ----- | z | 73.48 | 70.81 | 61.47 | 49.82 | 39.75 | 35.79 | 50.07 | ||||||||||||
| 1974 | 26.32 | 38.20 | 43.45 | a | 50.00 | 56.08 | 69.57 | 71.06 | 68.95 | 60.62 | 49.32 | 40.10 | 29.29 | 50.25 | ||||||||||||
| 1975 | 22.61 | 32.87 | a | 40.90 | b | 44.87 | 56.19 | 63.48 | a | 76.23 | 68.03 | 62.16 | a | 51.31 | 36.88 | 28.05 | 48.63 | |||||||||
| 1976 | 27.47 | 30.14 | 37.77 | 48.12 | a | 59.11 | 62.75 | 72.27 | 66.74 | 63.60 | 51.11 | 41.18 | 29.98 | 49.19 | ||||||||||||
| 1977 | 21.90 | 35.34 | 42.50 | 54.90 | 56.65 | 72.98 | 74.16 | 72.55 | 62.98 | 52.74 | 40.20 | ----- | z | 53.36 | ||||||||||||
| 1978 | 38.73 | c | ----- | z | 51.08 | a | 48.65 | 54.79 | 65.55 | 74.08 | 68.48 | a | 58.07 | 49.16 | 35.75 | 27.00 | 51.94 | |||||||||
| 1979 | 17.00 | ----- | z | ----- | z | ----- | z | 59.84 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 38.42 | |||
| 1980 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1981 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 63.18 | 71.06 | 72.90 | 62.52 | b | 49.50 | 42.82 | 33.40 | b | 56.48 | ||||||
| 1982 | 21.84 | 26.30 | 42.48 | a | 46.20 | 56.98 | 65.29 | a | 70.11 | 72.26 | 60.37 | 49.66 | 34.90 | 29.85 | 48.02 | |||||||||||
| 1983 | 30.44 | 39.23 | 46.35 | 46.77 | 56.68 | 65.43 | 69.84 | 73.26 | 60.75 | 51.48 | 42.30 | 26.10 | 50.72 | |||||||||||||
| 1984 | 22.92 | 27.17 | 41.63 | 47.65 | 57.10 | 63.22 | 73.08 | 71.94 | 57.75 | 45.82 | 38.70 | 20.31 | 47.27 | |||||||||||||
| 1985 | 15.27 | 23.32 | 37.50 | 53.06 | e | 59.18 | a | 66.20 | 76.88 | a | 66.61 | c | 54.27 | b | 46.03 | 26.82 | 11.17 | b | 44.69 | |||||||
| 1986 | 17.04 | s | ----- | z | 47.89 | d | 49.58 | 58.32 | 70.37 | 68.95 | 74.56 | 59.18 | 51.65 | 40.37 | 28.28 | b | 54.91 | |||||||||
| 1987 | 22.90 | 36.11 | 46.05 | ----- | z | 62.39 | 68.13 | 71.15 | 69.03 | 64.53 | 51.56 | 40.76 | e | 32.39 | 51.36 | |||||||||||
| 1988 | 21.37 | 33.31 | 42.45 | 52.82 | k | 59.67 | a | 69.98 | 73.63 | a | 70.19 | 60.12 | ----- | z | 39.80 | 25.29 | 49.58 | |||||||||
| 1989 | 18.06 | 16.43 | 41.13 | 53.60 | 56.77 | 67.22 | 72.60 | 67.37 | 59.88 | 47.65 | 34.83 | 26.67 | d | 46.85 | ||||||||||||
| 1990 | 31.45 | 32.34 | 46.19 | 52.76 | k | 56.45 | k | 64.78 | 73.55 | 73.19 | 68.52 | 47.02 | 37.42 | 17.81 | d | 49.23 | ||||||||||
| 1991 | 20.58 | 38.73 | 42.74 | 49.28 | ----- | z | ----- | z | 74.11 | ----- | z | 64.25 | 51.08 | 37.34 | a | 30.68 | 45.42 | |||||||||
| 1992 | 31.21 | 40.50 | 48.73 | 55.02 | 64.79 | 70.72 | 70.06 | 71.32 | 60.37 | 51.77 | 35.65 | 25.06 | 52.10 | |||||||||||||
| 1993 | 23.61 | 25.00 | 39.73 | 49.28 | 62.29 | 62.18 | 64.79 | ----- | z | 57.95 | 48.55 | a | 28.67 | a | ----- | z | 46.21 | |||||||||
| 1994 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1995 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1996 | 30.03 | 33.41 | 45.19 | 50.93 | 57.06 | 67.67 | 77.92 | 74.24 | 61.37 | 52.00 | b | 40.30 | 32.34 | 51.87 | ||||||||||||
| 1997 | 32.29 | 37.04 | 45.11 | 49.82 | 63.50 | 68.73 | 73.68 | 75.61 | 67.17 | 50.92 | 40.53 | 30.35 | 52.90 | |||||||||||||
| 1998 | 32.52 | 38.00 | 44.61 | 51.05 | 58.16 | 65.55 | 80.97 | 77.42 | 69.67 | 51.44 | 42.28 | 29.05 | 53.39 | |||||||||||||
| 1999 | 33.55 | 33.57 | 43.19 | 49.02 | 57.23 | 67.17 | 74.69 | 75.50 | 62.79 | b | 52.15 | a | 43.07 | 28.85 | 51.73 | |||||||||||
| 2000 | 29.48 | 38.91 | 43.31 | 54.88 | 60.97 | 70.30 | 77.45 | 76.19 | 62.72 | 50.92 | a | 33.03 | 29.87 | 52.34 | ||||||||||||
| 2001 | 26.06 | 31.55 | 44.90 | 48.43 | 62.21 | 68.15 | 76.52 | 77.74 | 67.17 | 51.37 | 41.82 | 28.71 | 52.05 | |||||||||||||
| 2002 | 29.58 | 31.04 | 41.16 | 51.35 | 60.47 | 70.95 | 80.87 | 71.68 | 64.68 | 49.03 | b | 38.18 | 34.76 | 51.98 | ||||||||||||
| 2003 | 35.68 | 38.32 | 47.06 | 50.27 | 61.50 | 71.57 | 81.00 | 77.18 | 65.62 | 55.74 | 35.08 | 35.81 | 54.57 | |||||||||||||
| 2004 | 25.19 | 31.03 | 48.65 | 53.90 | 60.02 | 70.37 | 78.61 | 75.19 | 62.67 | 52.77 | 37.65 | 33.48 | 52.46 | |||||||||||||
| 2005 | 28.34 | 34.84 | 44.92 | 49.73 | 60.10 | 65.48 | 77.24 | 75.69 | 62.25 | 51.63 | 35.53 | 23.35 | 50.76 | |||||||||||||
| 2006 | 32.79 | 32.12 | 42.27 | 52.78 | 61.79 | 71.25 | 82.27 | 74.15 | 64.90 | 50.52 | 40.47 | 29.95 | 52.94 | |||||||||||||
| 2007 | 28.69 | 37.50 | 47.29 | 51.33 | 63.37 | 70.48 | 83.23 | 74.26 | 63.87 | 50.03 | a | 38.72 | 30.79 | 53.30 | ||||||||||||
| 2008 | 23.92 | 32.76 | 40.02 | 46.13 | 60.92 | 66.38 | 77.66 | b | 75.53 | 63.12 | 51.47 | 40.53 | 28.31 | 50.56 | ||||||||||||
| 2009 | 27.21 | 32.68 | 40.53 | 50.32 | 60.69 | 67.27 | 76.98 | 75.02 | 68.30 | 46.60 | 37.72 | 25.00 | 50.69 | |||||||||||||
| 2010 | ----- | z | 37.00 | 42.50 | o | 48.28 | 52.66 | 64.10 | 75.44 | 77.55 | u | 64.43 | 55.08 | 37.40 | 28.17 | k | 54.30 | |||||||||
| 2011 | ----- | z | ----- | z | ----- | z | ----- | z | 56.06 | g | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 35.83 | 28.55 | 32.19 | |||
| 2012 | 32.10 | b | 36.28 | 38.50 | y | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 34.19 | ||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 26.93 | 33.95 | 43.18 | 50.96 | 59.56 | 67.19 | 75.22 | 72.85 | 62.59 | 51.01 | 38.59 | 29.42 | 51.11 | |||||||||||||
| S.D. | 5.91 | 5.27 | 3.08 | 2.80 | 2.83 | 2.81 | 3.21 | 2.94 | 3.19 | 2.60 | 3.12 | 4.89 | 1.71 | |||||||||||||
| SKEW | -0.44 | -0.84 | -0.15 | 0.19 | 0.20 | 0.31 | -0.12 | -0.21 | -0.20 | -0.16 | -0.81 | -0.84 | -0.72 | |||||||||||||
| MAX | 39.45 | 43.95 | 51.08 | 58.90 | 66.89 | 75.95 | 83.23 | 80.15 | 69.67 | 56.31 | 44.72 | 39.62 | 55.86 | |||||||||||||
| MIN | 8.34 | 16.43 | 33.55 | 44.87 | 52.66 | 61.75 | 64.79 | 66.61 | 54.27 | 45.82 | 26.82 | 11.17 | 44.69 | |||||||||||||
| NO YRS | 92 | 90 | 91 | 89 | 90 | 92 | 93 | 91 | 93 | 92 | 96 | 94 | 73 | |||||||||||||