YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1915 | ----- | z | 52.86 | 56.84 | 64.85 | 69.69 | 81.02 | 86.53 | a | 88.56 | 79.40 | 71.82 | 58.18 | 51.19 | 69.18 | a | ||||||||||
1916 | 51.05 | 59.10 | 63.35 | 67.38 | 72.00 | 82.43 | 88.97 | 86.89 | 80.93 | 66.69 | 56.13 | 46.98 | 68.49 | |||||||||||||
1917 | 48.75 | a | 52.48 | 54.29 | c | 63.13 | ----- | z | 83.40 | 88.82 | 85.65 | 81.95 | 72.35 | 60.91 | a | 53.78 | b | 67.77 | a | |||||||
1918 | 48.79 | b | 54.56 | a | 60.92 | 65.47 | 71.00 | 85.57 | 87.88 | e | 82.87 | 82.08 | 73.08 | 55.85 | d | 49.39 | 68.12 | |||||||||
1919 | 50.23 | 49.62 | 56.74 | f | 67.75 | 75.47 | 84.43 | 86.85 | a | 88.52 | e | 80.50 | k | 66.21 | 56.92 | 53.56 | 67.96 | b | ||||||||
1920 | 50.78 | d | 55.29 | 56.00 | 63.05 | 76.45 | 83.50 | 89.69 | 86.58 | a | 80.65 | 67.81 | 57.28 | 46.97 | a | 67.84 | ||||||||||
1921 | 51.27 | 56.16 | 63.42 | 64.85 | 71.10 | 83.70 | o | 89.03 | 86.81 | 82.15 | 72.94 | g | ----- | z | 55.17 | h | 70.60 | d | ||||||||
1922 | 47.40 | 54.36 | 56.19 | 61.58 | 78.02 | 85.65 | 90.37 | 89.50 | 86.65 | 71.43 | a | 53.85 | t | 54.50 | 70.51 | a | ||||||||||
1923 | 55.84 | ----- | z | ----- | z | ----- | z | ----- | z | 81.73 | 86.23 | 86.13 | 75.33 | a | 62.12 | a | 58.96 | q | 48.19 | 70.79 | e | |||||
1924 | 47.78 | a | 57.50 | 47.75 | q | 63.40 | a | 76.30 | a | 84.22 | 88.58 | 88.63 | 85.20 | ----- | z | 59.65 | 52.09 | h | 72.36 | c | ||||||
1925 | 51.50 | 59.32 | 66.79 | 71.07 | 78.89 | 81.48 | i | 91.47 | a | 87.86 | m | 79.70 | 68.43 | a | 55.89 | g | 51.54 | h | 70.90 | d | ||||||
1926 | 47.27 | 56.62 | 62.87 | 68.95 | 76.89 | 86.58 | 88.05 | 88.56 | 83.67 | 72.60 | 59.54 | p | 53.61 | v | 73.21 | b | ||||||||||
1927 | ----- | z | 56.38 | 56.98 | 65.25 | ----- | z | 82.90 | 91.52 | a | 87.27 | 82.43 | 73.11 | 63.32 | 50.84 | f | 73.24 | c | ||||||||
1928 | 48.20 | p | 53.21 | e | 60.18 | l | 67.32 | e | 76.50 | 83.28 | 90.50 | g | 88.21 | 82.70 | 71.10 | 59.67 | a | 51.50 | c | 70.39 | c | |||||
1929 | 48.61 | c | 51.60 | c | 56.20 | f | 60.79 | p | 76.27 | e | 85.20 | h | 89.93 | c | 87.65 | a | 81.93 | a | 72.19 | b | 56.55 | a | 55.23 | 68.88 | c | |
1930 | 50.60 | e | 58.41 | 57.44 | m | 70.20 | e | 68.24 | h | 83.52 | b | 86.98 | b | 81.12 | s | 77.71 | f | 69.52 | 60.32 | e | 52.50 | e | 66.51 | d | ||
1931 | 53.30 | a | ----- | z | 63.19 | e | 70.84 | n | 78.79 | g | 85.25 | l | 92.48 | b | 87.61 | 83.47 | 71.77 | a | 56.91 | g | 49.38 | a | 71.60 | e | ||
1932 | 45.87 | 55.69 | 62.72 | v | 66.43 | b | 73.31 | 82.00 | a | 88.34 | 89.50 | b | 83.80 | c | 68.67 | a | 60.97 | a | 47.21 | 69.25 | a | |||||
1933 | 48.54 | e | 50.62 | 60.61 | 63.88 | a | 71.27 | 85.57 | 92.35 | 90.43 | a | 84.90 | 75.53 | b | 63.12 | a | 53.90 | 70.06 | ||||||||
1934 | 53.02 | c | 59.75 | 68.03 | 71.42 | ----- | z | 80.67 | 90.72 | a | 85.75 | a | 80.21 | a | 72.73 | c | 59.72 | a | 54.04 | g | 72.20 | b | ||||
1935 | 53.56 | d | 57.29 | b | 56.31 | d | 66.05 | 69.21 | l | 84.96 | f | ----- | z | 84.90 | a | 81.82 | e | ----- | z | 55.54 | d | 53.18 | 63.58 | d | ||
1936 | 50.40 | a | 53.64 | 61.38 | b | 71.02 | g | 76.72 | a | 83.74 | g | 89.00 | h | 88.47 | b | 81.35 | 73.07 | b | 62.45 | 53.95 | a | 66.82 | c | |||
1937 | 43.71 | b | 54.80 | a | 60.82 | c | 67.33 | c | 77.84 | b | 84.29 | b | 91.08 | 90.77 | a | 86.13 | 74.24 | 61.98 | a | 56.59 | b | 70.80 | ||||
1938 | 55.66 | b | 56.81 | a | 59.72 | a | 68.24 | a | 76.16 | c | 84.52 | 89.50 | a | 87.02 | j | 87.11 | c | 71.17 | a | 56.67 | 55.98 | f | 70.55 | b | ||
1939 | 53.35 | a | 49.79 | d | 63.31 | 72.08 | d | 78.55 | a | 85.53 | 91.60 | 89.60 | 82.23 | b | 70.25 | a | 65.03 | 57.19 | b | 71.54 | ||||||
1940 | 54.41 | b | 56.43 | 63.17 | a | 69.55 | b | 80.77 | a | 88.25 | 91.35 | a | 90.58 | 84.62 | a | 72.70 | a | 59.05 | b | 56.69 | 72.30 | |||||
1941 | 54.67 | a | 59.38 | 59.15 | 63.37 | 75.76 | b | 81.36 | a | 89.22 | a | 86.00 | 79.79 | b | 68.21 | 61.43 | g | 53.66 | 70.05 | a | ||||||
1942 | 53.76 | b | 52.46 | 58.61 | 65.90 | f | 73.97 | b | 84.05 | 92.89 | 88.50 | b | 84.82 | 71.74 | 63.08 | 54.98 | 70.81 | a | ||||||||
1943 | 52.76 | 59.62 | 63.08 | 70.45 | a | 78.92 | f | 83.50 | b | 92.13 | a | 88.74 | b | 85.08 | d | 73.29 | 62.82 | h | 54.43 | c | 72.31 | b | ||||
1944 | 51.44 | 52.26 | 56.73 | 64.25 | 75.08 | 79.71 | b | 89.15 | 91.02 | a | 84.23 | 74.15 | 58.05 | 53.18 | 69.10 | |||||||||||
1945 | 51.44 | 54.96 | 56.62 | c | 66.30 | 75.29 | 80.73 | 91.60 | b | 89.90 | 84.57 | 74.24 | 58.83 | 50.76 | 69.60 | |||||||||||
1946 | 50.69 | 52.80 | 62.28 | b | 72.45 | a | 75.68 | 86.13 | 89.98 | g | 89.39 | 84.73 | 67.07 | c | 56.03 | 55.66 | f | 69.73 | b | |||||||
1947 | 48.90 | f | 59.00 | 61.53 | 66.80 | 78.40 | 83.67 | 92.85 | 87.98 | 86.38 | a | 72.77 | 55.77 | 52.26 | h | 74.52 | b | |||||||||
1948 | 53.25 | a | 54.03 | 57.50 | c | 70.02 | 75.95 | a | 83.90 | 91.70 | a | 91.05 | 86.67 | 75.18 | 56.75 | 51.58 | 70.63 | |||||||||
1949 | 44.76 | 52.43 | a | 59.84 | 71.10 | 76.08 | 85.87 | 90.17 | a | 88.32 | 86.95 | 69.50 | 65.55 | 51.86 | b | 70.20 | ||||||||||
1950 | 50.66 | 59.64 | 62.64 | b | 71.25 | 74.47 | 83.47 | 88.93 | a | 88.24 | 80.98 | 76.85 | 63.77 | 56.98 | d | 71.49 | ||||||||||
1951 | 51.29 | 56.07 | 59.65 | 67.14 | a | 76.16 | 82.23 | 92.08 | 86.61 | 82.35 | 71.39 | 58.70 | 51.44 | 69.59 | ||||||||||||
1952 | 50.79 | 53.93 | 54.60 | a | 66.93 | 78.95 | a | 83.90 | 89.47 | 90.07 | a | 85.73 | 76.19 | 57.20 | 51.39 | 69.93 | ||||||||||
1953 | 55.37 | 54.09 | 61.84 | 66.00 | a | 70.23 | a | 84.33 | 90.47 | a | 89.42 | 84.22 | 71.92 | 61.72 | 49.61 | 69.93 | ||||||||||
1954 | 52.71 | 61.54 | 59.76 | j | 70.80 | 77.45 | 83.70 | 90.81 | 87.39 | 84.94 | e | 73.66 | 62.78 | 53.45 | 72.66 | a | ||||||||||
1955 | 48.32 | 51.11 | 60.30 | a | 64.43 | 74.87 | 82.60 | 86.56 | 86.71 | 82.25 | 75.76 | 59.38 | 55.48 | 68.98 | ||||||||||||
1956 | 55.05 | 50.69 | 61.47 | 66.17 | 77.48 | 88.27 | 89.21 | 86.11 | 85.30 | 69.98 | 57.88 | 53.27 | 70.07 | |||||||||||||
1957 | 53.68 | 61.32 | 61.48 | 66.52 | 72.66 | 86.88 | 92.79 | 89.13 | 82.80 | 70.08 | 57.34 | a | 53.68 | c | 70.70 | |||||||||||
1958 | 52.82 | 58.11 | 56.12 | g | 66.25 | 80.80 | c | 82.96 | q | ----- | z | 89.83 | m | 86.41 | b | 75.69 | e | 59.60 | d | 56.83 | h | 68.53 | e | |||
1959 | 54.11 | 53.43 | 61.63 | 72.02 | b | 72.72 | f | 89.17 | o | 92.48 | a | ----- | z | 81.28 | 71.88 | b | 58.62 | d | 51.39 | c | 66.32 | c | ||||
1960 | 46.27 | 47.85 | c | ----- | z | ----- | z | 78.36 | f | 89.58 | e | ----- | z | 88.98 | f | ----- | z | ----- | z | ----- | z | ----- | z | 61.23 | i | |
1961 | 55.11 | m | 55.05 | 58.95 | 66.48 | a | 72.00 | 84.87 | 88.50 | a | 86.29 | b | 77.80 | 67.18 | 54.60 | 49.84 | 69.23 | a | ||||||||
1962 | 49.87 | 53.89 | a | 54.43 | a | 69.33 | 70.65 | 79.23 | 86.40 | 88.06 | 80.95 | a | 69.13 | 60.00 | 53.73 | 67.97 | ||||||||||
1963 | 46.00 | 58.16 | 57.39 | 62.87 | 76.63 | 78.52 | 89.94 | 85.52 | 82.47 | 72.40 | 58.45 | 50.03 | a | 68.20 | ||||||||||||
1964 | 45.53 | b | 47.76 | 54.47 | 62.60 | 70.05 | 77.95 | 86.74 | ----- | z | ----- | z | ----- | z | 53.75 | 51.13 | 61.11 | c | ||||||||
1965 | 52.47 | 53.25 | 55.61 | 62.88 | 68.81 | b | 75.14 | a | 85.95 | 83.98 | ----- | z | 70.06 | 61.22 | a | 53.32 | 65.70 | a | ||||||||
1966 | 48.87 | 50.12 | 61.03 | 67.33 | 76.76 | 81.87 | 87.81 | 86.29 | 81.32 | 69.32 | 59.80 | 51.60 | 68.51 | |||||||||||||
1967 | 49.29 | 55.38 | 60.53 | 60.63 | 71.87 | 78.13 | 87.05 | 86.34 | 81.57 | 71.29 | 62.35 | 46.97 | a | 67.62 | ||||||||||||
1968 | 51.98 | 58.98 | 59.15 | 64.55 | 71.66 | 80.72 | a | 85.18 | a | 82.39 | 79.88 | 69.53 | 57.98 | 49.24 | 67.60 | |||||||||||
1969 | 55.05 | 53.45 | 56.56 | 66.67 | 75.50 | 79.95 | 88.18 | 88.94 | 81.23 | 66.79 | 59.98 | 54.22 | a | 68.88 | ||||||||||||
1970 | 51.27 | 59.34 | 59.50 | 62.80 | 75.16 | 82.67 | 90.15 | 87.85 | 78.93 | 67.26 | 59.77 | 52.92 | 68.97 | |||||||||||||
1971 | 51.26 | 54.73 | 61.58 | 65.45 | a | 70.53 | 80.82 | 89.13 | 85.63 | 81.20 | 67.92 | a | 58.60 | 50.45 | 68.11 | |||||||||||
1972 | 50.74 | 58.36 | 67.85 | 67.43 | a | 73.73 | 82.70 | 89.92 | a | 85.56 | 81.02 | 69.90 | ----- | z | 50.23 | 70.68 | a | |||||||||
1973 | 49.95 | a | 55.96 | 55.40 | 64.82 | 76.24 | 82.90 | 87.31 | 86.82 | 77.73 | 69.85 | 57.37 | 52.66 | 68.09 | ||||||||||||
1974 | 51.56 | 54.05 | 62.58 | 66.30 | 74.40 | 85.10 | 86.05 | 84.40 | 81.08 | 72.05 | 58.57 | 47.88 | a | 68.67 | ||||||||||||
1975 | 50.39 | 53.59 | 57.11 | 60.47 | 71.66 | 79.85 | 87.65 | 86.00 | 81.72 | 69.08 | 58.72 | 54.21 | 67.54 | |||||||||||||
1976 | 53.81 | 59.55 | 60.48 | a | 66.55 | 76.03 | 81.98 | 86.25 | a | 86.45 | 78.90 | 68.63 | 61.22 | 52.84 | 69.39 | |||||||||||
1977 | 53.15 | 59.21 | 58.66 | 69.45 | 70.44 | 86.03 | 89.50 | 87.29 | 81.38 | a | 73.85 | 62.50 | 56.29 | 70.65 | ||||||||||||
1978 | 53.69 | 56.23 | 63.60 | 65.07 | 73.18 | 84.45 | 88.32 | 85.45 | 81.18 | 74.48 | 59.95 | 50.42 | 69.67 | |||||||||||||
1979 | 48.19 | 54.00 | 58.42 | 66.12 | a | 73.42 | 83.27 | 87.30 | a | 83.77 | 84.80 | 71.60 | 57.60 | 55.00 | 68.62 | |||||||||||
1980 | 55.61 | 59.38 | 58.94 | 66.68 | 71.40 | 82.60 | 89.47 | 85.85 | 80.82 | 70.48 | 59.17 | 57.79 | 69.85 | |||||||||||||
1981 | 55.47 | 56.77 | 60.03 | 70.37 | 73.77 | 85.73 | 88.61 | 88.84 | 82.27 | 68.84 | 62.00 | 54.60 | 70.61 | |||||||||||||
1982 | 51.34 | 57.63 | a | 59.52 | 67.09 | b | 73.86 | b | 79.52 | 86.71 | 88.05 | c | 81.52 | d | 67.88 | a | 58.81 | a | 51.69 | 68.64 | ||||||
1983 | 54.67 | b | 55.79 | 60.09 | b | 62.68 | e | 75.57 | b | 82.19 | a | 89.90 | a | 88.86 | c | 87.72 | c | 73.02 | a | 59.62 | a | 54.31 | b | 70.37 | ||
1984 | 53.30 | a | 56.37 | b | 62.78 | b | 66.83 | c | 81.43 | c | 82.90 | 87.78 | a | 88.64 | b | 83.38 | a | 67.50 | a | 58.57 | a | 50.98 | a | 70.04 | ||
1985 | 51.03 | b | 54.20 | a | 60.15 | d | 71.13 | c | 76.64 | b | 84.28 | 88.90 | a | 87.33 | d | 75.96 | d | 70.05 | c | 56.46 | b | 51.83 | a | 69.00 | ||
1986 | 57.58 | 57.09 | a | 65.59 | c | 68.60 | a | 75.80 | d | 85.13 | c | 85.41 | b | 88.61 | 76.98 | b | 68.23 | a | 59.76 | a | 51.47 | 70.02 | ||||
1987 | 51.02 | a | 56.40 | b | 59.10 | b | 72.25 | d | 76.25 | c | 84.38 | a | 85.89 | c | 86.45 | c | 80.16 | b | 74.70 | a | 57.72 | a | 48.43 | b | 69.40 | |
1988 | 51.15 | a | 58.67 | b | 61.12 | e | 67.20 | e | 74.59 | d | 84.50 | d | 89.30 | c | 87.91 | c | 80.03 | 76.62 | a | 59.05 | 51.12 | a | 70.10 | |||
1989 | 50.68 | a | 57.40 | b | 65.04 | e | 73.68 | e | 76.59 | d | 83.19 | a | 90.15 | d | 86.57 | a | 82.91 | a | 71.03 | b | 61.22 | 53.08 | a | 70.96 | ||
1990 | 52.10 | 54.66 | f | 63.89 | d | 70.63 | d | 74.81 | d | 86.23 | b | 88.36 | c | 84.93 | c | 82.36 | b | 72.82 | a | 61.32 | b | 49.47 | a | 71.54 | a | |
1991 | 52.03 | 61.71 | b | 56.12 | f | 65.77 | d | 74.21 | e | 79.91 | a | 87.77 | e | 87.89 | c | 81.87 | c | 73.86 | b | 58.72 | a | 54.16 | 70.72 | a | ||
1992 | 52.83 | a | 58.61 | b | 60.81 | d | 71.16 | a | 76.88 | b | 82.61 | b | 87.04 | d | 87.38 | e | 83.23 | 73.13 | 55.53 | a | 50.37 | a | 69.97 | |||
1993 | 55.34 | 55.96 | a | 62.12 | a | 68.84 | b | 77.82 | 83.12 | b | 86.00 | a | 86.95 | c | 81.74 | a | 71.41 | c | 57.55 | 53.23 | 70.01 | |||||
1994 | 53.17 | a | 55.09 | 63.28 | a | 68.72 | a | 74.54 | c | 85.80 | c | 88.43 | b | 90.10 | b | 83.57 | c | 69.50 | a | 55.73 | 54.21 | 70.18 | ||||
1995 | 52.86 | b | 61.92 | b | 62.29 | b | 66.04 | b | 72.09 | b | 81.02 | c | 88.68 | a | 90.17 | b | 85.02 | b | 72.13 | 64.25 | 54.26 | 70.89 | ||||
1996 | 54.10 | 60.21 | a | 63.59 | b | 70.44 | c | 78.39 | c | 86.57 | a | 91.00 | b | 89.95 | b | 80.77 | b | 71.15 | a | 62.10 | 53.68 | a | 71.83 | |||
1997 | 54.39 | 56.08 | b | 66.00 | c | 68.44 | c | 81.23 | c | 82.31 | c | 87.86 | c | 89.78 | h | 85.33 | c | 70.67 | b | 60.33 | 50.72 | a | 69.40 | a | ||
1998 | 53.71 | c | 53.25 | d | 59.92 | f | 64.42 | f | 72.58 | e | 80.71 | d | 89.92 | e | 90.22 | d | 83.23 | d | 70.16 | 59.38 | a | 52.58 | 70.58 | b | ||
1999 | 54.88 | a | 58.40 | b | 62.17 | d | 64.08 | d | 74.92 | 83.17 | a | 88.38 | c | 87.80 | a | 85.27 | 78.87 | 63.32 | 51.90 | a | 71.10 | |||||
2000 | 55.00 | 59.02 | c | 61.07 | c | 71.71 | b | 79.73 | c | 84.98 | b | 88.84 | c | 88.32 | c | 84.57 | b | 69.47 | b | 52.60 | 53.60 | 70.74 | ||||
2001 | 51.96 | f | 53.64 | c | 62.24 | b | 67.52 | c | 81.26 | d | 85.34 | a | 88.20 | d | 87.88 | c | 85.29 | a | 73.26 | b | 62.34 | a | 49.52 | b | 72.41 | a |
2002 | 51.83 | b | 57.50 | b | 60.20 | d | 71.02 | e | 76.27 | c | 86.56 | e | 89.54 | e | 88.78 | a | 83.80 | c | 70.08 | a | 61.35 | 51.80 | a | 70.73 | ||
2003 | 58.26 | b | 56.11 | a | 61.17 | b | 66.24 | g | 77.78 | b | 84.82 | b | 91.48 | e | 89.42 | e | 84.85 | c | 76.87 | a | 58.09 | b | 53.34 | b | 72.02 | a |
2004 | 55.32 | c | 53.41 | b | 69.23 | 69.60 | 78.60 | a | 85.26 | a | 89.36 | c | 87.36 | b | 82.85 | d | 70.48 | b | 57.83 | a | 52.90 | 71.02 | ||||
2005 | 55.34 | 56.57 | 60.08 | a | 68.37 | c | 78.20 | a | 84.78 | a | 91.74 | 88.29 | 83.38 | 73.55 | 61.85 | 53.73 | 71.32 | |||||||||
2006 | 54.89 | 58.79 | b | 60.24 | 69.14 | b | 79.87 | 88.59 | a | 91.94 | d | 88.84 | 81.50 | a | 71.21 | 63.41 | b | 51.13 | a | 71.63 | ||||||
2007 | 50.78 | f | 57.52 | b | 65.21 | b | 70.52 | c | 79.27 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 68.13 | h |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 51.82 | 55.80 | 60.65 | 67.27 | 75.37 | 83.40 | 89.13 | 87.65 | 82.57 | 71.33 | 59.40 | 52.32 | 69.75 | |||||||||||||
S.D. | 2.93 | 3.13 | 3.22 | 3.02 | 2.99 | 2.57 | 1.98 | 1.85 | 2.53 | 2.85 | 2.64 | 2.46 | 1.22 | |||||||||||||
SKEW | -0.50 | -0.31 | 0.15 | -0.07 | -0.09 | -0.37 | 0.07 | -0.44 | -0.34 | -0.07 | 0.03 | -0.19 | -0.09 | |||||||||||||
MAX | 58.26 | 61.92 | 69.23 | 73.68 | 81.43 | 89.58 | 92.89 | 91.05 | 87.72 | 78.87 | 65.55 | 57.79 | 72.30 | |||||||||||||
MIN | 43.71 | 47.76 | 54.29 | 60.47 | 68.81 | 75.14 | 85.18 | 82.39 | 75.33 | 62.12 | 52.60 | 46.97 | 67.54 | |||||||||||||
YRS | 86 | 90 | 81 | 85 | 83 | 84 | 86 | 84 | 87 | 87 | 82 | 81 | 54 |