YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1914 | 52.74 | 51.89 | 59.74 | 65.20 | 71.74 | 74.27 | 79.24 | b | 76.52 | 66.93 | a | 64.03 | 52.30 | 43.10 | 63.14 | |||||||||||
1915 | 44.48 | 50.50 | 58.68 | 62.37 | 65.71 | 71.13 | 75.84 | 77.94 | 68.20 | 60.90 | 47.93 | 46.71 | 60.87 | |||||||||||||
1916 | 36.65 | 48.34 | 51.48 | 59.50 | 61.97 | 70.27 | 72.48 | 75.97 | 69.33 | 57.81 | 48.87 | 41.94 | 57.88 | |||||||||||||
1917 | 42.80 | a | 45.89 | 48.84 | 55.67 | 62.71 | 70.00 | a | 77.45 | 79.06 | 68.87 | 61.27 | a | 56.17 | 49.90 | 59.89 | ||||||||||
1918 | 49.13 | 47.44 | a | 52.73 | a | 60.97 | 63.58 | 75.00 | 75.77 | a | 74.52 | f | 74.61 | g | 61.03 | b | 51.90 | 45.06 | 58.26 | b | ||||||
1919 | 46.35 | 46.93 | 52.53 | a | 60.07 | a | 66.29 | 69.45 | a | 76.47 | a | 76.00 | e | 70.61 | b | 57.37 | a | 50.04 | c | 43.68 | 59.65 | |||||
1920 | 44.94 | 46.83 | 52.97 | 55.53 | 63.52 | 70.40 | 77.27 | a | 77.96 | c | 67.48 | a | 56.73 | a | 53.80 | 47.16 | 59.55 | |||||||||
1921 | 46.42 | 49.68 | 53.42 | 57.82 | b | 65.17 | a | 70.52 | c | 73.13 | 74.03 | 66.27 | 62.00 | a | 51.73 | 44.63 | a | 59.57 | ||||||||
1922 | 40.77 | 46.43 | 49.87 | a | 55.62 | a | 66.00 | 74.28 | a | 76.80 | a | 74.81 | 71.03 | 59.77 | 49.87 | 43.87 | a | 59.09 | ||||||||
1923 | 45.39 | 44.54 | 53.90 | 61.79 | a | 64.71 | c | 72.37 | c | 79.58 | g | 80.03 | a | 73.42 | f | 63.11 | c | 53.57 | b | 48.67 | a | 58.81 | b | |||
1924 | 46.37 | a | 53.59 | b | 54.03 | a | 61.32 | e | 71.81 | e | 74.88 | d | 78.48 | d | 75.92 | g | 72.35 | d | 61.45 | b | 51.00 | a | 45.79 | c | 61.01 | a |
1925 | 46.61 | c | 50.42 | b | 51.62 | e | 59.79 | k | 68.20 | f | 71.68 | b | 79.19 | 74.70 | k | 69.96 | c | 60.71 | 52.13 | 50.50 | e | 59.20 | c | |||
1926 | 46.63 | a | 53.92 | d | 61.83 | b | 69.76 | a | 68.71 | 76.21 | a | 80.06 | 79.23 | r | 80.83 | ----- | z | 52.94 | l | 46.54 | e | 64.94 | c | |||
1927 | 45.21 | b | 51.21 | 53.77 | a | 61.74 | c | 65.11 | d | 74.60 | 79.27 | a | 79.26 | 70.00 | a | 62.35 | 51.64 | b | 43.39 | 61.46 | ||||||
1928 | 47.29 | 50.11 | a | 57.10 | 59.33 | 72.06 | 72.63 | 80.52 | 79.39 | 71.00 | a | 59.57 | a | 53.47 | 46.00 | a | 62.37 | |||||||||
1929 | 40.26 | 43.54 | 54.87 | 57.57 | 67.16 | 71.07 | a | 79.61 | 80.77 | 74.23 | 65.26 | 51.43 | 48.84 | 61.22 | ||||||||||||
1930 | 38.61 | 52.04 | 58.13 | a | 64.03 | 66.06 | 71.90 | a | 78.13 | 81.48 | 70.70 | 60.13 | 50.55 | a | 47.53 | a | 61.61 | |||||||||
1931 | 50.29 | 52.11 | 55.71 | 64.13 | 71.97 | 71.33 | 80.03 | a | 78.94 | 69.60 | 60.70 | a | 49.20 | 46.50 | a | 62.54 | ||||||||||
1932 | 43.52 | 47.97 | 54.06 | 60.83 | 66.60 | a | 75.67 | 73.83 | a | 76.06 | 73.47 | 62.68 | 55.10 | 43.58 | 61.11 | |||||||||||
1933 | 44.87 | 44.36 | 53.84 | 61.47 | 61.87 | 71.77 | 77.40 | a | 79.45 | 67.00 | 61.65 | 50.40 | 49.48 | 60.30 | ||||||||||||
1934 | 50.26 | 54.64 | 61.32 | 67.77 | 69.84 | 74.20 | 75.81 | 79.42 | 69.10 | 63.77 | 54.70 | 48.00 | 64.07 | |||||||||||||
1935 | 46.55 | 51.00 | 50.42 | 61.07 | 68.97 | 73.41 | a | 77.65 | 79.31 | b | 74.13 | 59.55 | 49.07 | 48.13 | 61.60 | |||||||||||
1936 | 48.71 | 41.28 | 51.90 | 63.73 | 68.57 | a | 72.07 | 77.13 | a | 80.17 | b | 69.63 | 63.03 | 52.17 | a | 48.58 | 61.41 | |||||||||
1937 | 35.94 | 47.36 | 56.90 | 56.23 | 67.39 | 73.30 | 76.65 | 75.00 | 70.63 | 64.52 | 53.03 | 48.42 | 60.45 | |||||||||||||
1938 | 46.65 | 50.89 | 54.10 | 63.13 | 68.58 | 73.93 | 79.42 | 75.32 | 73.73 | 63.35 | 50.63 | 48.23 | 62.33 | |||||||||||||
1939 | 48.32 | 45.21 | 49.79 | b | 53.38 | d | 66.23 | 68.17 | 76.87 | 80.55 | 71.13 | 61.77 | 56.83 | 51.47 | a | 60.81 | ||||||||||
1940 | 49.81 | 51.86 | 57.39 | 61.57 | 70.19 | 75.30 | 77.29 | 77.16 | 72.43 | 63.68 | 49.87 | 49.26 | 62.98 | |||||||||||||
1941 | 49.52 | 54.54 | 61.55 | 64.97 | 66.00 | 70.97 | 81.55 | 75.58 | 66.27 | 60.29 | 54.53 | 49.26 | 62.92 | |||||||||||||
1942 | 45.52 | 49.68 | 54.74 | 61.00 | 64.61 | 69.93 | 78.55 | 79.90 | 72.67 | 64.74 | 51.80 | 49.32 | 61.87 | |||||||||||||
1943 | 42.65 | 52.75 | 54.45 | 63.63 | 65.61 | 71.33 | 78.03 | a | 76.65 | 76.47 | 63.87 | 51.75 | f | 45.55 | 62.82 | a | ||||||||||
1944 | 47.61 | 49.41 | 53.68 | 60.07 | 66.26 | 71.50 | 78.48 | 76.74 | 74.50 | 64.84 | 51.67 | 44.23 | 61.58 | |||||||||||||
1945 | 48.39 | 50.11 | 52.39 | 56.53 | 67.90 | b | 70.62 | a | 80.80 | a | 77.55 | 67.93 | c | 62.13 | a | 51.53 | 47.39 | 61.10 | ||||||||
1946 | 47.48 | 50.32 | 53.29 | 59.20 | 70.93 | b | 69.34 | a | 76.00 | a | 76.68 | 69.53 | 57.61 | 49.90 | a | 46.17 | b | 60.54 | ||||||||
1947 | ----- | z | 53.04 | 55.35 | 67.79 | a | 78.30 | a | 72.41 | a | ----- | z | 77.68 | 74.47 | 62.80 | f | 52.31 | a | 50.46 | c | 64.65 | c | ||||
1948 | 52.39 | c | 51.34 | 52.96 | e | 58.70 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 42.11 | m | 53.85 | h | ||
1949 | 38.81 | 45.79 | ----- | z | 62.87 | 70.90 | 73.63 | 76.19 | 77.35 | 74.77 | 58.84 | 57.43 | 45.87 | 62.04 | a | |||||||||||
1950 | 33.77 | 49.43 | 51.61 | 59.20 | 66.42 | 74.30 | 79.32 | 79.28 | b | 75.13 | g | 58.74 | 51.30 | 52.00 | 59.58 | a | ||||||||||
1951 | 45.16 | 50.11 | 51.94 | 68.00 | 69.35 | 79.03 | 80.71 | 78.35 | 72.73 | 62.31 | e | 52.67 | 43.94 | 62.86 | ||||||||||||
1952 | 44.45 | 48.86 | 52.81 | 64.13 | 68.97 | 72.00 | 82.32 | 80.00 | 76.28 | e | 66.93 | a | 49.37 | 48.10 | b | 62.85 | ||||||||||
1953 | 52.16 | 50.37 | a | 54.45 | 59.40 | 66.43 | a | 68.93 | 79.32 | 76.87 | a | 74.17 | a | 65.10 | 53.83 | 48.84 | 62.49 | |||||||||
1954 | 43.97 | 51.32 | 54.71 | 58.90 | 68.67 | a | 67.87 | 74.77 | 72.84 | 69.77 | 61.45 | 56.17 | 47.03 | a | 60.62 | |||||||||||
1955 | 46.71 | 47.29 | 48.55 | 55.20 | 64.16 | 71.23 | 72.35 | 76.65 | 69.55 | a | 60.81 | 47.20 | 46.39 | 58.84 | ||||||||||||
1956 | 46.48 | 43.90 | 51.61 | 64.17 | 74.45 | 69.31 | a | 79.14 | b | 77.77 | 70.90 | 59.71 | 49.67 | 48.69 | b | 61.32 | ||||||||||
1957 | 40.26 | 48.57 | 53.90 | 61.20 | 70.26 | 72.90 | a | 74.83 | a | 74.96 | c | 77.47 | 61.35 | 51.69 | a | 50.19 | 61.47 | |||||||||
1958 | 50.06 | 55.00 | b | 55.73 | a | 61.97 | 75.42 | 77.77 | 86.17 | a | 82.10 | 72.13 | 63.29 | 51.66 | a | 52.84 | 65.34 | |||||||||
1959 | 47.32 | 49.07 | 53.77 | a | 62.17 | 67.33 | a | 73.10 | 80.90 | 77.48 | 68.30 | 61.48 | 53.80 | 47.65 | 61.86 | |||||||||||
1960 | 45.55 | 50.72 | 54.19 | 61.33 | 64.52 | 73.60 | 82.26 | 74.81 | 70.23 | 63.00 | 52.17 | 46.13 | 61.54 | |||||||||||||
1961 | 51.68 | 53.11 | 55.20 | a | 57.87 | 66.61 | 77.40 | 81.48 | 83.65 | 71.40 | 60.90 | 49.47 | 47.16 | 62.99 | ||||||||||||
1962 | 45.93 | a | 52.14 | 53.06 | 61.97 | a | 62.45 | 73.28 | a | 78.03 | 75.48 | 73.13 | 61.94 | 54.07 | a | 48.80 | a | 61.69 | ||||||||
1963 | 41.48 | 56.79 | 54.00 | 59.13 | 69.90 | 70.23 | 74.63 | a | 76.55 | 76.40 | 64.26 | 52.63 | 48.06 | 62.01 | ||||||||||||
1964 | 47.61 | 50.89 | a | 53.94 | 58.40 | 66.06 | 70.30 | 75.84 | 74.00 | 70.33 | 63.29 | 48.27 | 42.52 | 60.12 | ||||||||||||
1965 | 45.65 | 50.18 | 57.68 | 62.63 | 65.97 | 74.47 | 80.94 | 77.84 | 70.13 | 66.35 | 55.37 | 46.55 | 62.81 | |||||||||||||
1966 | 46.61 | 51.25 | 55.19 | 61.47 | 69.48 | 71.33 | 75.52 | 79.23 | 72.93 | 62.35 | 53.13 | 50.39 | 62.41 | |||||||||||||
1967 | 49.19 | 51.25 | 51.32 | 57.37 | 67.90 | 77.53 | 80.52 | 85.52 | 79.37 | 63.29 | 53.80 | 46.97 | 63.67 | |||||||||||||
1968 | 47.10 | 56.72 | 57.00 | 59.97 | 68.77 | 72.28 | a | 81.77 | 75.19 | 70.23 | 60.35 | 52.77 | 42.71 | 62.07 | ||||||||||||
1969 | 38.48 | b | 49.46 | 57.39 | 59.97 | a | 71.58 | 76.52 | a | 78.26 | 74.87 | 69.57 | 60.00 | 50.83 | a | 47.55 | 61.21 | |||||||||
1970 | 45.13 | 53.68 | 55.03 | 56.30 | 66.68 | 75.53 | 76.59 | b | 75.45 | 65.67 | 57.29 | 48.70 | 41.19 | 59.77 | ||||||||||||
1971 | 42.77 | 45.41 | a | 48.33 | a | 58.57 | 68.74 | 67.73 | 79.39 | 82.26 | 70.50 | 59.68 | 52.10 | 43.84 | 59.94 | |||||||||||
1972 | 43.97 | 49.48 | 55.42 | 56.37 | 71.13 | 71.37 | 79.03 | 79.52 | 68.63 | 60.32 | 52.50 | 43.10 | 60.90 | |||||||||||||
1973 | 46.74 | 52.71 | 54.90 | 61.57 | 69.84 | 71.60 | 79.03 | 74.68 | 73.33 | 60.81 | 48.97 | 49.32 | 61.96 | |||||||||||||
1974 | 45.48 | 49.82 | 53.94 | 57.90 | 63.32 | 73.63 | 75.26 | 79.13 | 78.23 | 64.68 | 53.73 | 49.65 | 62.06 | |||||||||||||
1975 | 46.13 | 49.36 | 52.26 | 57.07 | 67.16 | 71.17 | 78.61 | 73.26 | 74.83 | 59.29 | 52.33 | 47.65 | 60.76 | |||||||||||||
1976 | 48.03 | 48.90 | 51.39 | 59.95 | i | 68.16 | 70.23 | 77.00 | 72.61 | 72.73 | 62.84 | 52.90 | 48.62 | b | 61.22 | a | ||||||||||
1977 | 43.35 | 55.43 | 52.29 | 63.93 | 63.87 | 74.27 | 76.03 | 82.35 | 68.43 | 61.71 | 50.23 | 47.48 | 61.62 | |||||||||||||
1978 | 48.97 | a | 52.79 | 58.16 | 60.17 | 66.03 | 76.63 | 79.06 | 76.35 | 67.17 | 64.87 | 48.60 | 43.35 | 61.85 | ||||||||||||
1979 | 42.39 | 48.93 | 59.65 | 60.07 | 69.48 | 74.83 | 80.87 | 77.39 | 74.00 | 64.00 | 50.13 | 50.68 | 62.70 | |||||||||||||
1980 | 41.94 | 51.00 | 53.58 | 64.87 | 67.52 | 68.60 | 77.97 | 75.58 | 72.23 | 65.10 | 53.57 | 50.13 | a | 61.84 | ||||||||||||
1981 | 49.87 | 52.32 | 59.48 | 59.77 | 65.45 | 69.40 | 76.42 | 82.81 | 73.63 | 59.74 | 54.93 | 47.13 | 62.58 | |||||||||||||
1982 | 45.74 | 50.07 | 54.33 | d | 61.80 | e | 68.63 | a | 77.97 | 76.27 | a | 78.03 | a | 73.55 | a | 62.67 | a | 51.64 | b | 47.21 | b | 62.33 | ||||
1983 | 50.13 | a | 54.89 | a | 58.26 | 63.33 | 72.32 | 70.90 | 75.00 | a | 78.73 | a | 70.48 | a | 62.00 | b | 54.24 | a | 41.39 | 62.64 | ||||||
1984 | 49.87 | 52.28 | 58.58 | 59.59 | a | 65.19 | 71.45 | a | 80.03 | 79.87 | 73.23 | 60.00 | 51.17 | 43.45 | b | 62.06 | ||||||||||
1985 | 43.90 | 47.93 | 53.74 | 61.24 | a | 68.37 | a | 74.50 | 85.94 | 79.64 | c | 69.39 | b | 62.06 | 42.72 | a | 40.77 | 60.85 | ||||||||
1986 | 52.13 | 50.85 | a | 59.52 | 58.40 | 67.27 | a | 76.33 | 72.65 | 82.70 | a | 69.38 | a | 62.94 | 51.10 | a | 46.00 | 62.44 | ||||||||
1987 | 46.71 | 53.00 | 56.94 | 64.33 | 68.77 | 76.43 | 76.18 | c | 79.73 | a | 75.93 | 67.33 | a | 55.40 | 45.13 | 63.82 | ||||||||||
1988 | 45.66 | b | 51.71 | a | 56.03 | 60.86 | b | 66.00 | a | 71.41 | a | 78.39 | 77.84 | 73.60 | 62.94 | 51.87 | 47.29 | 61.97 | ||||||||
1989 | 47.13 | 44.79 | 51.43 | a | 65.14 | b | 66.73 | a | 75.97 | 75.55 | 76.23 | 76.70 | 62.16 | 52.67 | 47.81 | 61.86 | ||||||||||
1990 | 48.48 | 47.14 | 57.06 | 61.93 | 64.83 | a | 70.60 | 81.30 | a | 79.46 | c | 75.07 | 60.57 | a | 53.10 | 40.64 | c | 61.68 | ||||||||
1991 | 46.77 | 55.86 | 52.81 | 59.67 | 63.42 | 68.29 | b | 80.04 | c | 79.69 | b | 74.79 | a | 63.31 | b | 53.63 | 47.93 | a | 62.18 | |||||||
1992 | 51.11 | c | 56.08 | d | 60.22 | d | 63.57 | 72.63 | d | ----- | z | 77.03 | a | 80.23 | 72.96 | e | 62.69 | b | 51.79 | a | 46.14 | c | 63.13 | a | ||
1993 | 43.71 | c | 51.71 | 56.71 | c | 58.63 | 70.03 | 70.48 | a | 70.21 | c | 77.25 | c | 75.50 | b | 64.94 | 49.86 | a | 47.54 | c | 61.38 | |||||
1994 | 50.42 | 47.71 | 59.48 | b | 61.77 | 68.71 | 71.26 | c | 82.68 | f | 79.14 | b | 76.00 | c | 62.77 | 48.80 | 49.08 | e | 61.38 | a | ||||||
1995 | 51.74 | 55.17 | p | 57.00 | 63.48 | e | 70.71 | 73.97 | 79.77 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 66.11 | f | |||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 46.00 | 50.21 | 54.74 | 60.89 | 67.73 | 72.59 | 78.00 | 77.98 | 71.90 | 61.98 | 51.83 | 46.85 | 61.61 | |||||||||||||
S.D. | 3.86 | 3.22 | 3.05 | 3.17 | 3.12 | 2.63 | 2.83 | 2.61 | 3.22 | 2.25 | 2.42 | 2.73 | 1.29 | |||||||||||||
SKEW | -0.76 | -0.27 | 0.29 | 0.24 | 0.58 | 0.33 | 0.09 | 0.30 | 0.34 | -0.06 | -0.45 | -0.37 | -0.21 | |||||||||||||
MAX | 52.74 | 56.79 | 61.83 | 69.76 | 78.30 | 79.03 | 86.17 | 85.52 | 80.83 | 67.33 | 57.43 | 52.84 | 65.34 | |||||||||||||
MIN | 33.77 | 41.28 | 48.33 | 53.38 | 61.87 | 67.73 | 70.21 | 72.61 | 65.67 | 56.73 | 42.72 | 40.64 | 57.88 | |||||||||||||
YRS | 81 | 81 | 81 | 80 | 80 | 80 | 78 | 76 | 77 | 78 | 78 | 80 | 68 |