YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1916 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1917 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1918 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1919 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1920 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1921 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 92.70 | t | 80.32 | 62.13 | 50.16 | 64.21 | i | |||
1922 | 42.65 | 50.89 | 60.65 | 65.83 | 84.48 | 97.83 | 102.48 | 97.74 | 94.17 | 79.23 | 58.63 | 54.35 | 74.08 | |||||||||||||
1923 | 52.90 | 54.46 | 61.65 | 72.27 | 85.61 | 91.27 | 99.48 | 94.58 | 85.63 | 72.90 | 59.87 | 48.06 | 73.22 | |||||||||||||
1924 | 45.74 | 59.93 | 61.45 | 74.13 | 87.26 | 100.03 | 100.81 | 100.81 | 89.07 | 75.16 | 60.80 | 41.26 | 74.70 | |||||||||||||
1925 | 34.65 | 57.71 | 66.68 | 76.96 | d | 90.42 | 93.23 | 102.74 | d | 94.31 | e | 86.81 | c | 75.00 | q | ----- | z | 51.13 | a | 75.46 | b | |||||
1926 | 48.71 | 58.93 | a | 66.77 | 73.23 | 84.61 | 99.03 | 100.06 | 99.84 | 90.77 | 78.61 | 63.72 | a | 45.74 | 75.84 | |||||||||||
1927 | 47.65 | 57.00 | 62.62 | b | 76.23 | 86.94 | 95.47 | 101.55 | 94.65 | 88.37 | 79.12 | o | 65.57 | 50.23 | 75.11 | a | ||||||||||
1928 | 53.32 | 59.31 | 70.90 | 74.50 | 87.16 | 95.73 | 101.87 | 98.61 | 95.63 | 79.03 | 59.83 | 46.26 | 76.85 | |||||||||||||
1929 | 45.81 | 50.25 | 61.97 | 69.20 | 85.13 | 96.93 | 100.39 | 97.45 | 90.27 | 79.03 | 59.33 | 54.32 | 74.17 | |||||||||||||
1930 | 43.65 | 60.07 | 66.58 | 81.97 | 81.13 | 98.90 | 100.00 | 97.90 | 91.63 | 76.06 | 54.52 | a | 42.13 | 74.55 | ||||||||||||
1931 | 42.13 | 56.82 | 66.87 | 79.33 | 85.19 | 98.87 | 106.52 | 102.48 | 92.47 | 80.65 | 57.20 | 40.87 | 75.78 | |||||||||||||
1932 | 41.52 | 53.76 | 66.71 | 77.80 | 84.68 | 94.23 | 101.23 | 100.35 | 94.43 | 75.65 | 63.23 | 42.23 | 74.65 | |||||||||||||
1933 | 39.65 | 47.14 | 67.29 | 71.83 | 79.42 | 99.87 | 104.23 | 100.52 | 96.87 | 82.74 | 62.83 | 51.32 | 75.31 | |||||||||||||
1934 | 53.74 | 62.57 | 76.45 | 83.10 | 92.35 | 94.97 | a | 105.00 | 101.71 | 92.37 | 81.87 | 64.87 | 51.13 | 80.01 | ||||||||||||
1935 | 49.10 | b | 58.93 | 63.48 | 76.43 | 80.39 | 100.23 | 102.19 | 99.06 | 92.77 | 78.97 | 58.93 | 47.23 | 75.64 | ||||||||||||
1936 | 50.50 | a | 57.34 | 68.77 | 79.80 | 89.74 | 99.87 | 102.52 | 99.76 | b | 88.70 | 76.06 | 59.73 | 50.45 | 76.94 | |||||||||||
1937 | 35.61 | 51.04 | 64.19 | 75.43 | 89.74 | 95.43 | 102.00 | f | 101.43 | x | 93.85 | q | 79.95 | k | 65.30 | j | 53.22 | m | 68.58 | f | ||||||
1938 | 51.24 | j | 56.06 | j | 65.00 | s | 78.44 | c | 80.04 | f | 96.18 | m | 100.29 | q | 99.23 | e | 90.10 | 75.55 | 52.43 | 47.74 | 73.92 | f | ||||
1939 | 46.39 | 44.86 | 64.97 | 79.30 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 58.88 | h | ||||
1940 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1941 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1942 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1943 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 97.75 | j | 104.77 | a | 100.33 | a | 95.61 | b | 80.18 | c | 63.04 | b | 50.50 | a | 82.40 | f |
1944 | 47.45 | b | 54.37 | b | 64.00 | a | 70.30 | c | 84.97 | 93.50 | 103.62 | b | 103.13 | a | 96.11 | c | 81.88 | o | 61.43 | g | 51.04 | f | 79.72 | c | ||
1945 | 50.70 | a | 59.11 | 61.03 | b | 73.00 | 87.40 | a | 92.90 | 102.66 | b | 99.53 | a | 93.78 | c | 78.38 | b | 62.89 | c | 48.21 | b | 75.80 | ||||
1946 | 50.14 | c | 59.00 | b | 68.28 | b | 80.50 | 85.45 | 100.46 | b | 102.80 | a | 100.10 | 95.91 | g | 73.71 | c | 59.15 | c | 54.08 | e | 75.79 | a | |||
1947 | 49.97 | a | 63.75 | d | 73.36 | c | 78.56 | c | 91.48 | d | 96.36 | e | 104.52 | b | 98.43 | h | 100.12 | d | 80.14 | b | 58.33 | 50.68 | 77.02 | a | ||
1948 | 51.90 | a | 54.17 | 60.73 | a | 79.89 | b | 89.94 | 96.45 | a | 104.84 | 101.27 | a | 96.97 | a | 80.32 | 59.77 | 51.60 | a | 77.32 | ||||||
1949 | 39.61 | 48.04 | 66.81 | 80.90 | 86.32 | 95.17 | 103.48 | 102.45 | 96.00 | a | 76.10 | 66.10 | 50.23 | 75.93 | ||||||||||||
1950 | 49.55 | 61.25 | 70.06 | 81.63 | 86.94 | 99.03 | 99.71 | 100.42 | 92.10 | 87.39 | 67.13 | 57.17 | a | 79.37 | ||||||||||||
1951 | 49.55 | 57.25 | 66.81 | 77.50 | 86.19 | d | 96.67 | 106.29 | 99.32 | 95.97 | 78.23 | a | 58.17 | 47.83 | a | 76.65 | ||||||||||
1952 | 46.65 | 56.00 | 61.06 | 76.73 | 89.10 | 96.90 | 103.13 | 101.55 | 94.80 | 85.55 | 58.63 | 48.71 | 76.57 | |||||||||||||
1953 | 56.39 | 59.50 | 70.29 | 76.67 | 82.57 | a | 99.83 | 103.26 | 98.61 | 97.23 | d | 78.30 | d | 64.13 | g | 50.21 | b | 79.35 | a | |||||||
1954 | 51.35 | 65.30 | a | 65.33 | a | 85.88 | d | 92.25 | c | 98.36 | b | 103.03 | 100.27 | a | 92.68 | b | 80.37 | d | 64.81 | d | 47.21 | c | 78.90 | |||
1955 | 47.70 | d | 51.42 | d | 67.89 | c | 76.73 | d | 84.00 | b | 93.48 | a | 102.30 | d | 101.50 | e | 96.48 | c | 82.63 | a | 62.88 | e | 55.89 | c | 76.91 | |
1956 | 54.52 | b | 57.61 | a | 71.62 | b | 76.28 | a | 88.50 | c | 101.86 | a | 102.10 | a | 98.46 | c | 98.63 | c | 79.75 | c | 56.82 | b | 49.24 | b | 77.95 | |
1957 | 48.54 | e | 59.79 | 68.85 | d | 75.78 | c | 80.87 | a | 97.57 | 101.36 | c | 97.00 | b | 94.07 | b | 75.18 | c | 55.50 | f | 52.73 | e | 77.43 | a | ||
1958 | 50.90 | b | 60.85 | b | 60.55 | b | 75.21 | a | 91.80 | a | 100.35 | d | 104.07 | d | 103.79 | b | 91.21 | b | 79.96 | e | 61.29 | b | 54.80 | f | 80.00 | a |
1959 | 52.83 | a | 57.92 | c | 70.68 | c | 79.71 | b | 86.70 | a | 101.35 | d | 106.07 | b | 99.35 | e | 92.86 | a | 78.71 | c | 60.92 | f | 50.64 | f | 82.62 | b |
1960 | 44.04 | e | 54.93 | a | 71.24 | b | 77.85 | c | 89.17 | b | 103.00 | b | 106.52 | d | 104.22 | d | 96.15 | d | 75.48 | b | 60.43 | g | 45.57 | c | 78.93 | a |
1961 | 49.72 | f | 61.04 | b | 66.69 | b | 76.72 | a | 88.67 | a | 102.75 | b | 105.18 | i | 98.80 | a | 87.82 | b | 75.68 | f | 61.14 | p | 41.04 | e | 77.94 | d |
1962 | 48.85 | d | 57.19 | a | 62.50 | a | 84.14 | a | 85.97 | a | 97.64 | h | 103.30 | h | 104.37 | l | 95.12 | e | 81.96 | f | 64.81 | d | ----- | z | 71.22 | e |
1963 | 42.32 | i | 63.25 | d | 66.75 | c | 73.81 | c | 91.60 | a | 95.21 | a | 106.45 | b | 97.65 | 93.96 | c | 83.30 | a | 64.14 | a | 51.60 | f | 83.61 | b | |
1964 | 51.04 | c | ----- | z | 63.63 | a | 74.45 | a | 85.97 | a | 96.36 | b | 105.13 | a | 99.26 | d | ----- | z | ----- | z | ----- | z | ----- | z | 82.26 | e |
1965 | 55.50 | e | 57.62 | b | ----- | z | ----- | z | ----- | z | 90.67 | 99.68 | 99.65 | 88.20 | 79.87 | 63.60 | 48.40 | a | 75.91 | c | ||||||
1966 | 46.35 | 49.00 | 67.71 | 79.50 | 91.45 | 98.47 | 102.39 | 101.84 | 92.47 | 76.16 | 63.97 | 48.94 | 76.52 | |||||||||||||
1967 | 47.39 | 60.11 | 70.94 | 73.08 | e | 84.90 | 93.30 | 102.61 | 99.23 | 88.73 | 81.04 | c | 65.40 | 40.97 | 75.64 | |||||||||||
1968 | 38.42 | 60.93 | 68.29 | 72.70 | 86.19 | 99.20 | 100.58 | 93.23 | 91.70 | 78.55 | 60.97 | 44.87 | a | 74.64 | ||||||||||||
1969 | 53.17 | a | 53.50 | 62.52 | 79.83 | 91.77 | 96.83 | 103.03 | 103.13 | 93.10 | 71.97 | 59.67 | 52.52 | 76.75 | ||||||||||||
1970 | 52.03 | 61.29 | 64.19 | 72.90 | 90.26 | 97.27 | 101.42 | 101.35 | 91.14 | a | 75.42 | 63.93 | c | 49.94 | 76.76 | |||||||||||
1971 | 51.17 | a | 58.82 | 69.03 | a | 77.27 | 84.87 | a | 99.30 | 105.87 | a | 99.29 | 92.73 | d | 73.19 | 57.97 | 43.77 | e | 76.11 | |||||||
1972 | 53.07 | a | 62.41 | b | 77.03 | a | 81.34 | a | 90.07 | d | 98.55 | a | 105.42 | 100.03 | 91.00 | 68.08 | g | 55.83 | a | 43.77 | 78.05 | a | ||||
1973 | 39.06 | 53.04 | 59.77 | 73.80 | 88.15 | d | 97.23 | 102.90 | 101.19 | 92.79 | b | 79.84 | 62.48 | a | 52.68 | 75.24 | ||||||||||
1974 | 43.21 | c | 53.04 | c | 73.21 | b | 76.75 | b | 93.00 | a | 104.37 | 102.13 | 101.07 | b | 92.33 | 77.37 | a | 59.52 | g | 49.35 | 78.71 | a | ||||
1975 | 48.90 | 54.07 | 62.94 | 70.20 | 82.90 | 95.10 | 102.10 | a | 99.13 | 92.23 | 77.68 | 61.37 | ----- | z | 76.97 | a | ||||||||||
1976 | 48.48 | 62.00 | 66.23 | 76.97 | 88.32 | 98.90 | a | 102.90 | 100.42 | 89.53 | 76.87 | 63.30 | c | 50.85 | d | 77.06 | ||||||||||
1977 | 48.23 | 60.57 | 66.06 | 83.00 | b | 83.67 | a | 100.86 | b | 101.52 | 100.84 | 94.40 | 80.90 | 65.66 | a | 61.89 | l | 80.52 | a | |||||||
1978 | 52.21 | g | 56.84 | c | 65.95 | i | 77.67 | c | 86.23 | 100.93 | 104.74 | 102.35 | 90.40 | 82.00 | c | 58.30 | 40.94 | 80.04 | b | |||||||
1979 | 40.77 | a | 48.39 | 64.29 | 78.53 | 88.93 | c | 98.10 | 105.06 | 99.10 | 97.00 | 85.78 | m | 57.50 | 49.32 | 75.18 | a | |||||||||
1980 | 51.03 | 58.17 | 62.55 | 77.03 | 82.39 | 99.47 | 105.71 | 102.35 | 88.87 | 79.27 | a | 63.07 | ----- | z | 79.08 | a | ||||||||||
1981 | ----- | z | 61.30 | e | 66.36 | c | 82.40 | 86.43 | a | 103.33 | 103.61 | 99.67 | a | 91.77 | 74.35 | 62.77 | 52.62 | b | 80.42 | a | ||||||
1982 | 49.68 | f | 53.17 | d | 66.90 | 75.82 | b | 85.67 | a | 96.76 | a | 102.29 | 96.32 | 90.89 | b | 73.10 | b | 57.12 | e | 50.07 | d | 77.10 | a | |||
1983 | 52.37 | a | 58.74 | a | 66.61 | c | 72.38 | a | ----- | z | 98.60 | 101.14 | c | 99.67 | a | 93.36 | b | 77.67 | d | 63.70 | c | 51.59 | b | 75.98 | a | |
1984 | 49.96 | c | ----- | z | 61.86 | b | 73.92 | d | 93.39 | c | 97.08 | d | 102.79 | c | 98.03 | a | 94.59 | c | 72.12 | f | 64.72 | e | 49.60 | f | 81.82 | c |
1985 | 47.46 | g | 55.12 | c | 65.65 | h | 81.37 | 84.45 | 103.62 | a | 103.86 | b | 103.73 | a | 86.66 | a | 76.11 | d | 58.93 | b | 51.81 | 80.57 | b | |||
1986 | 55.77 | a | 64.67 | a | 73.19 | 81.08 | e | 90.46 | c | 102.04 | b | 103.36 | c | 102.40 | f | 87.52 | c | 73.59 | d | 61.69 | d | 51.83 | b | 76.84 | a | |
1987 | 51.14 | b | 55.07 | a | 64.96 | d | 83.81 | c | 87.47 | a | 101.79 | a | 104.53 | p | 96.88 | o | 91.42 | k | 81.19 | e | 60.23 | d | 48.50 | a | 70.46 | c |
1988 | 49.68 | 60.30 | b | 67.00 | 76.04 | c | 86.86 | q | 100.17 | 106.23 | 99.97 | 92.13 | 85.07 | a | 63.83 | a | 52.04 | c | 77.49 | a | ||||||
1989 | 45.35 | k | 57.05 | h | 75.77 | 86.00 | d | 91.23 | 99.52 | a | 106.19 | 99.35 | 92.33 | c | 78.38 | j | 65.26 | c | 55.46 | g | 89.46 | d | ||||
1990 | 51.38 | g | 56.93 | m | 71.82 | i | 81.74 | k | 90.56 | f | 104.71 | f | 102.77 | e | 99.23 | e | 91.93 | 79.65 | 60.03 | 46.90 | j | 86.72 | g | |||
1991 | 45.65 | 59.75 | 62.16 | 75.93 | ----- | z | ----- | z | 104.37 | d | 101.38 | b | ----- | z | 82.17 | h | 55.67 | i | 44.27 | p | 74.87 | f | ||||
1992 | 44.11 | m | 57.12 | l | 66.05 | l | 80.95 | j | 84.90 | k | 95.05 | k | 99.50 | o | 98.71 | n | 90.71 | f | 81.94 | m | 57.65 | j | 40.63 | l | ----- | z |
1993 | 47.09 | i | 54.42 | i | 66.95 | j | 76.61 | l | 88.09 | i | 95.32 | k | 102.39 | h | 96.21 | l | 91.50 | f | 72.70 | k | 55.55 | j | 48.61 | m | ----- | z |
1994 | 49.95 | l | 51.54 | b | 71.58 | 78.23 | 87.90 | 105.37 | 106.23 | 103.26 | 91.07 | 75.61 | 56.07 | 48.43 | a | 79.57 | a | |||||||||
1995 | 49.87 | 64.21 | ----- | z | 76.62 | v | 86.38 | o | 97.47 | o | ----- | z | ----- | z | 92.92 | e | 81.46 | e | 67.77 | 53.90 | b | 68.36 | f | |||
1996 | 53.94 | 61.14 | 70.39 | 81.39 | g | 92.07 | b | 103.30 | 106.29 | 102.97 | a | 89.67 | 74.83 | a | 59.90 | 52.06 | 78.78 | a | ||||||||
1997 | 50.77 | 56.79 | 73.44 | d | 67.85 | j | 91.75 | c | 99.73 | 103.29 | 99.96 | g | 90.10 | a | 75.42 | 62.77 | 49.77 | 75.38 | b | |||||||
1998 | 53.68 | 55.54 | b | 67.35 | 72.77 | ----- | z | 96.30 | 105.65 | 101.29 | 88.41 | a | 73.10 | 60.55 | a | 52.11 | c | 75.16 | a | |||||||
1999 | 56.55 | 61.89 | 73.45 | 70.86 | a | 87.23 | a | 98.38 | a | 99.52 | 97.97 | 91.37 | 81.34 | b | 66.17 | 52.29 | c | 78.08 | ||||||||
2000 | 55.52 | 61.25 | a | 68.16 | 80.85 | c | 92.47 | a | 102.20 | 106.29 | 102.52 | 94.33 | 76.68 | 55.47 | 52.84 | 79.05 | ||||||||||
2001 | 50.10 | b | 55.96 | 68.45 | 77.52 | a | 92.87 | 102.00 | 102.45 | 100.06 | 96.03 | 82.58 | 66.07 | 49.87 | 78.66 | |||||||||||
2002 | 51.52 | 57.18 | 66.48 | 85.27 | 91.10 | 105.43 | 108.29 | 104.32 | 91.00 | 74.81 | 61.80 | 50.97 | 79.01 | |||||||||||||
2003 | 56.32 | 57.11 | a | 68.39 | 78.07 | 91.90 | a | 103.29 | b | 110.72 | b | 102.81 | 94.28 | a | 82.86 | b | 59.32 | b | 53.77 | a | 79.90 | |||||
2004 | 49.96 | f | 52.30 | b | 76.08 | g | 76.79 | b | 92.39 | 101.50 | 104.42 | 99.48 | 91.63 | 74.87 | 58.34 | a | 50.17 | h | 83.52 | c | ||||||
2005 | 55.67 | a | 55.18 | 65.58 | 75.52 | a | 95.75 | w | 99.14 | p | 109.75 | k | 97.13 | p | 95.31 | n | 79.16 | 63.20 | j | ----- | z | 66.22 | g | |||
2006 | 54.54 | g | 61.50 | 63.06 | 76.07 | 89.84 | 100.70 | 100.81 | 93.73 | a | 84.27 | 71.30 | a | 61.03 | 48.13 | 77.31 | a | |||||||||
2007 | 47.16 | 58.46 | 68.81 | 77.00 | 86.60 | a | 100.03 | 103.23 | 99.71 | 90.23 | 74.58 | 63.73 | 46.19 | 76.31 | ||||||||||||
2008 | 45.68 | 55.52 | 67.32 | 75.37 | 82.32 | 98.53 | 101.97 | 98.97 | 91.20 | 77.57 | a | 63.70 | 46.64 | i | 78.01 | a | ||||||||||
2009 | 54.57 | x | ----- | z | 64.67 | v | 74.37 | 88.83 | a | 91.60 | 102.87 | 101.00 | a | 91.63 | 76.23 | a | 62.20 | 45.17 | h | 86.09 | d | |||||
2010 | 45.07 | a | 53.14 | 62.06 | 73.47 | 81.45 | 98.04 | b | 102.00 | 95.74 | 94.70 | 77.14 | j | 58.90 | 53.03 | 74.33 | a | |||||||||
2011 | 48.81 | 53.43 | 67.26 | 73.23 | 81.45 | 97.27 | 100.48 | 101.87 | 90.73 | 76.03 | 58.67 | 47.26 | 74.71 | |||||||||||||
2012 | 51.92 | g | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 48.70 | 57.09 | 66.81 | 77.00 | 87.47 | 98.50 | 103.33 | 99.91 | 92.30 | 78.12 | 61.31 | 49.27 | 76.53 | |||||||||||||
S.D. | 5.00 | 4.34 | 4.02 | 3.95 | 3.54 | 3.28 | 2.20 | 2.39 | 3.06 | 3.36 | 3.23 | 3.83 | 1.73 | |||||||||||||
SKEW | -0.74 | -0.51 | 0.41 | 0.06 | -0.23 | -0.17 | 0.53 | -0.64 | -0.06 | 0.28 | -0.27 | -0.64 | 0.34 | |||||||||||||
MAX | 56.55 | 65.30 | 77.03 | 86.00 | 93.39 | 105.43 | 110.72 | 104.32 | 100.12 | 87.39 | 67.77 | 57.17 | 80.01 | |||||||||||||
MIN | 34.65 | 44.86 | 59.77 | 65.83 | 79.42 | 90.67 | 99.48 | 93.23 | 84.27 | 71.30 | 52.43 | 40.87 | 73.22 | |||||||||||||
YRS | 71 | 78 | 76 | 79 | 74 | 77 | 77 | 76 | 78 | 72 | 73 | 67 | 37 |