YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1915 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 91.09 | g | 88.45 | 70.27 | 62.11 | c | 73.61 | i | ||
1916 | 56.17 | g | 71.62 | 79.06 | 80.33 | 86.71 | 98.77 | 100.29 | 95.03 | 92.76 | i | ----- | z | ----- | z | 51.97 | 82.97 | d | ||||||||
1917 | 54.70 | a | 61.64 | 68.32 | 75.27 | 79.77 | 98.77 | 99.26 | 97.68 | 91.47 | 77.18 | n | 75.63 | 71.16 | 79.42 | a | ||||||||||
1918 | 60.03 | 62.07 | 65.13 | ----- | z | ----- | z | ----- | z | 99.22 | v | 90.61 | 92.31 | a | 78.70 | a | 57.63 | 49.90 | u | 72.36 | e | |||||
1919 | 58.61 | 55.11 | 63.26 | 79.83 | ----- | z | 96.37 | 87.28 | b | 95.10 | a | 94.50 | f | 76.40 | f | ----- | z | 61.81 | 74.67 | d | ||||||
1920 | 60.58 | 64.86 | 67.29 | 72.70 | 86.77 | 95.37 | 102.47 | a | 96.81 | ----- | z | ----- | z | 71.83 | 62.93 | a | 78.16 | b | ||||||||
1921 | 64.07 | a | 70.29 | 77.77 | a | 80.77 | 87.52 | 101.23 | 100.08 | f | 99.00 | t | 95.93 | p | 91.46 | e | 74.30 | j | 67.83 | a | 80.12 | d | ||||
1922 | 64.80 | a | 67.75 | d | 69.81 | 77.83 | 91.48 | 101.27 | 101.84 | ----- | z | 95.56 | n | 83.16 | 68.25 | f | 60.00 | 79.77 | c | |||||||
1923 | 62.90 | 63.46 | 67.43 | a | 73.35 | d | 89.84 | 96.37 | 103.19 | 98.52 | 91.55 | a | 79.52 | ----- | z | 55.00 | 80.10 | a | ||||||||
1924 | ----- | z | ----- | z | ----- | z | 76.60 | y | 84.81 | 98.77 | 93.84 | 95.52 | ----- | z | ----- | z | 65.60 | y | 54.84 | 85.55 | g | |||||
1925 | 58.77 | 69.15 | a | 74.58 | 80.10 | 90.45 | 95.93 | 104.67 | a | 98.00 | 90.70 | 77.13 | 66.60 | 61.23 | 80.61 | |||||||||||
1926 | 58.74 | 67.04 | 70.48 | 73.03 | 85.29 | 100.10 | 100.77 | 97.58 | 92.03 | 84.94 | 72.93 | 56.00 | 79.91 | |||||||||||||
1927 | 64.55 | 64.22 | a | 67.42 | 74.80 | 85.52 | j | 94.73 | 102.61 | 96.03 | 90.53 | 81.87 | 73.67 | 55.58 | 78.73 | a | ||||||||||
1928 | 61.65 | 63.00 | 73.94 | 78.55 | a | 90.35 | 97.70 | 102.48 | 98.87 | 96.37 | 85.55 | 68.67 | 58.77 | 81.32 | ||||||||||||
1929 | 56.19 | 60.18 | 69.55 | 75.57 | 89.10 | 98.33 | 101.61 | 97.37 | a | 91.86 | a | 88.55 | 68.37 | 67.81 | 80.37 | |||||||||||
1930 | 55.61 | 70.00 | 68.26 | 81.47 | 80.32 | 98.33 | 99.52 | 94.50 | k | 93.77 | 82.45 | 69.47 | 62.13 | 78.30 | a | |||||||||||
1931 | 61.81 | 62.46 | 73.65 | 81.43 | 89.77 | 96.77 | 104.13 | h | 96.13 | 90.80 | 81.90 | 61.00 | 52.81 | 77.14 | a | |||||||||||
1932 | 52.16 | 59.48 | 68.87 | 77.43 | 86.00 | 94.00 | 98.81 | 98.29 | j | 95.93 | 79.35 | 72.27 | 52.74 | 76.10 | a | |||||||||||
1933 | 52.84 | 56.21 | 71.58 | 71.37 | 79.97 | 95.93 | 101.65 | 98.61 | 93.47 | 84.19 | 71.30 | 60.42 | 78.13 | |||||||||||||
1934 | 61.84 | 67.54 | 79.77 | 82.67 | 91.26 | 92.53 | 102.84 | 100.35 | 96.80 | 90.06 | 73.67 | 66.06 | 83.78 | |||||||||||||
1935 | 62.42 | 66.57 | 66.87 | 80.10 | 83.27 | a | 101.97 | 102.55 | 97.65 | 94.30 | 84.32 | 70.10 | 63.00 | 81.09 | ||||||||||||
1936 | 62.90 | 64.00 | a | 73.77 | 83.77 | 94.90 | 103.17 | 102.06 | 100.77 | 92.37 | 81.90 | 69.60 | 59.32 | 82.38 | ||||||||||||
1937 | 46.47 | a | 61.21 | 67.94 | 79.90 | 89.48 | 98.14 | a | 103.19 | 104.03 | 97.82 | b | ----- | z | 75.53 | 63.97 | 80.70 | a | ||||||||
1938 | 65.35 | 63.71 | 67.61 | 80.14 | a | 88.90 | 98.90 | 101.74 | 99.94 | 96.57 | 84.26 | 71.93 | a | 64.84 | 81.99 | |||||||||||
1939 | 60.06 | 55.96 | 73.29 | 82.83 | 93.10 | 101.07 | 104.61 | 100.42 | 90.10 | 84.61 | 73.93 | 69.16 | 82.43 | |||||||||||||
1940 | 63.87 | 66.48 | 76.84 | 81.83 | a | 94.77 | 95.83 | 95.42 | 92.81 | 92.25 | j | 86.45 | ----- | z | 62.00 | 81.63 | b | |||||||||
1941 | 59.23 | 65.29 | 68.45 | 70.47 | 87.03 | a | 94.90 | 101.90 | 98.03 | a | 91.70 | 75.77 | 74.43 | 60.90 | 79.01 | |||||||||||
1942 | 61.17 | h | 62.36 | 70.58 | 77.37 | 88.71 | 99.47 | 106.50 | i | 101.35 | 98.00 | a | 85.26 | 78.17 | 66.48 | 82.77 | b | |||||||||
1943 | 63.19 | 68.92 | c | 76.85 | e | 86.20 | 92.29 | 96.53 | 102.90 | 96.81 | 97.73 | 86.06 | 74.27 | 62.16 | 83.66 | |||||||||||
1944 | 60.32 | 60.69 | 68.46 | e | 74.62 | a | 86.58 | 92.23 | 100.32 | 101.26 | 94.60 | 85.58 | 67.30 | 63.00 | 79.58 | |||||||||||
1945 | 60.26 | 65.00 | 61.48 | 77.17 | 89.68 | 96.67 | 102.48 | 100.52 | 98.47 | 85.00 | 72.63 | 58.39 | 80.64 | |||||||||||||
1946 | 58.39 | 67.07 | 71.37 | a | 85.87 | 89.35 | 101.83 | 100.93 | b | 96.26 | 88.93 | c | 80.10 | 65.00 | a | 64.06 | 80.76 | |||||||||
1947 | 58.40 | a | 71.07 | 74.45 | 80.53 | 93.00 | 95.40 | 104.29 | 97.58 | 97.43 | 86.87 | 67.83 | 61.60 | p | 84.26 | a | ||||||||||
1948 | 63.55 | 60.48 | 64.06 | 82.23 | 91.68 | 98.57 | 102.77 | 100.17 | b | 96.73 | 87.38 | b | 69.07 | a | 60.31 | b | 81.42 | |||||||||
1949 | 46.52 | 57.07 | 69.35 | 82.73 | 88.16 | 96.20 | 100.00 | 100.42 | 96.47 | 79.84 | 76.90 | 60.00 | 79.47 | |||||||||||||
1950 | 58.58 | 69.46 | 72.52 | 85.73 | 89.68 | 98.93 | a | 98.13 | 101.35 | 94.60 | 93.83 | a | 77.83 | 71.68 | 84.36 | |||||||||||
1951 | 68.00 | n | 64.79 | 73.42 | 78.23 | 87.45 | 97.83 | 104.90 | 97.81 | 96.73 | 85.42 | 67.43 | 58.19 | 82.93 | a | |||||||||||
1952 | 57.73 | a | 64.97 | 60.58 | 76.40 | 90.90 | 96.77 | 100.23 | 100.48 | 97.33 | 92.16 | 66.30 | 58.00 | 80.15 | ||||||||||||
1953 | 65.42 | 68.00 | 72.19 | 78.47 | 82.35 | 98.43 | 102.03 | 99.26 | 99.90 | 86.26 | 73.83 | 61.90 | 82.34 | |||||||||||||
1954 | 60.77 | 74.75 | 67.87 | 85.17 | 91.55 | 97.57 | 102.42 | 97.68 | 96.53 | 90.39 | 78.13 | 62.90 | 83.81 | |||||||||||||
1955 | 54.39 | 61.32 | 73.48 | 79.30 | 88.00 | a | 95.80 | 98.65 | 96.61 | 97.93 | 90.48 | 71.30 | 63.94 | 80.93 | ||||||||||||
1956 | 64.90 | 61.69 | 78.13 | 78.10 | 92.52 | 102.47 | 101.61 | 99.39 | 102.73 | 85.19 | 71.41 | a | 63.48 | 83.47 | ||||||||||||
1957 | 58.00 | 70.39 | 70.58 | 76.07 | 82.77 | 99.90 | 102.23 | 97.42 | 97.10 | 77.48 | 64.27 | 63.35 | 79.96 | |||||||||||||
1958 | 63.40 | a | 66.81 | a | 61.70 | a | 77.17 | 94.39 | 99.93 | 103.68 | 101.10 | 93.03 | 83.74 | 68.83 | 68.00 | 81.82 | ||||||||||
1959 | 64.65 | 62.71 | 75.52 | 83.67 | 87.03 | 101.57 | 104.10 | 95.42 | 94.79 | a | 84.26 | 70.73 | 60.74 | 82.10 | ||||||||||||
1960 | 54.29 | 59.72 | 75.06 | 81.70 | 89.55 | 103.37 | 105.97 | 102.16 | 97.90 | 80.42 | 70.90 | 60.90 | 81.83 | |||||||||||||
1961 | 64.10 | 69.21 | 70.26 | 82.03 | 89.39 | 102.43 | 103.81 | 98.94 | 90.73 | 84.58 | 66.77 | 57.39 | 81.64 | |||||||||||||
1962 | 58.65 | 64.18 | 64.19 | 86.07 | 87.10 | 98.67 | 101.45 | 104.45 | 94.80 | 86.16 | 75.87 | 64.06 | 82.14 | |||||||||||||
1963 | 57.74 | 72.21 | 70.52 | 77.10 | 92.77 | 95.48 | a | 105.39 | 95.52 | 95.40 | 88.48 | 70.17 | 62.52 | 81.94 | ||||||||||||
1964 | 59.68 | 63.28 | 66.77 | 76.37 | 87.94 | 96.97 | 104.03 | a | 95.35 | 91.60 | 91.06 | 65.73 | 59.61 | 79.87 | ||||||||||||
1965 | 60.29 | 64.50 | 66.39 | 72.87 | 83.48 | 91.23 | 102.03 | 101.86 | b | 90.38 | a | 89.55 | 72.97 | 58.33 | a | 79.49 | ||||||||||
1966 | 57.90 | 59.11 | 74.16 | 83.03 | 92.52 | 99.27 | 103.77 | 100.52 | 93.14 | a | 84.19 | 73.93 | 60.87 | 81.87 | ||||||||||||
1967 | 62.48 | 70.21 | 75.81 | 72.43 | 88.58 | 92.87 | 101.06 | 100.87 | a | 94.33 | 88.87 | 75.57 | 52.32 | 81.28 | ||||||||||||
1968 | 56.65 | 68.41 | 70.52 | 75.63 | 88.81 | 100.30 | 100.97 | 94.13 | 97.00 | 84.06 | 69.30 | 57.48 | 80.27 | |||||||||||||
1969 | 61.68 | 60.43 | 66.16 | 81.40 | 90.77 | 96.20 | 102.32 | 101.55 | 94.57 | 77.35 | 67.00 | a | 60.42 | 79.99 | ||||||||||||
1970 | 57.90 | 66.36 | 65.13 | 71.55 | a | 89.03 | 97.20 | 101.14 | b | 99.00 | b | 88.76 | a | 76.42 | 69.93 | 56.23 | 78.22 | |||||||||
1971 | 61.06 | 64.54 | 72.43 | a | 76.24 | a | 81.42 | 95.17 | 102.84 | 94.47 | a | 93.80 | 73.74 | 66.47 | 54.48 | 78.05 | ||||||||||
1972 | 60.65 | 68.79 | 81.74 | 81.28 | a | 89.03 | 95.37 | 103.71 | 97.80 | a | 92.60 | 75.52 | 60.52 | a | 54.94 | 80.16 | ||||||||||
1973 | 54.58 | 58.29 | 55.94 | 72.83 | a | 87.55 | 98.63 | 103.94 | 102.16 | 96.90 | 88.61 | 70.37 | 65.23 | 79.58 | ||||||||||||
1974 | 58.52 | 66.86 | 69.71 | 81.00 | 91.19 | 105.53 | 100.87 | 99.48 | 94.80 | 83.42 | 69.93 | b | 57.65 | 81.58 | ||||||||||||
1975 | 60.16 | 62.21 | 67.71 | 70.50 | 87.10 | 97.53 | 101.81 | 102.35 | 95.07 | 85.68 | 71.86 | a | 61.42 | 80.28 | ||||||||||||
1976 | 64.32 | 66.14 | 68.61 | 76.28 | a | 88.94 | 98.46 | d | 101.47 | a | 99.80 | a | 89.20 | 79.58 | 73.13 | 63.94 | 80.82 | |||||||||
1977 | 57.77 | 71.39 | 70.90 | 82.33 | 82.35 | 100.90 | 103.22 | m | 101.42 | 94.60 | e | 85.23 | 74.77 | 66.42 | 80.74 | a | ||||||||||
1978 | 59.40 | a | 63.61 | 70.58 | 77.30 | g | 87.61 | 102.28 | a | 105.45 | 100.16 | 95.80 | 87.90 | 68.13 | 55.74 | 81.52 | a | |||||||||
1979 | 52.23 | 63.32 | 67.61 | 79.30 | 84.39 | 98.73 | 105.61 | 99.29 | 101.03 | 89.48 | 69.80 | 65.60 | a | 81.37 | ||||||||||||
1980 | 59.26 | 65.31 | 67.55 | 80.83 | 82.61 | 100.97 | 105.94 | 99.68 | 97.37 | 86.90 | 78.67 | 69.16 | 82.85 | |||||||||||||
1981 | 66.97 | 70.43 | 68.39 | 83.00 | 87.32 | 102.83 | 101.84 | 101.10 | 94.07 | 79.42 | 73.33 | 62.58 | 82.61 | |||||||||||||
1982 | 58.00 | 63.52 | a | 65.42 | 78.40 | 86.71 | 96.37 | 101.26 | 98.65 | 92.17 | 82.39 | 66.47 | 55.77 | 78.76 | ||||||||||||
1983 | 61.00 | 61.82 | 64.94 | 70.57 | 87.67 | a | 96.17 | a | 101.32 | 97.32 | 95.53 | 79.83 | a | 67.83 | a | 59.13 | 78.59 | |||||||||
1984 | 61.97 | 67.97 | 75.74 | 76.93 | 95.52 | 96.60 | 99.42 | 97.19 | 94.93 | 77.06 | 70.43 | 55.55 | 80.78 | |||||||||||||
1985 | 57.87 | 61.57 | 66.03 | 81.27 | 89.35 | 101.60 | 102.23 | 101.39 | 88.34 | a | 82.74 | 67.90 | 63.06 | 80.28 | ||||||||||||
1986 | 68.16 | ----- | z | 74.19 | 79.62 | a | 89.00 | 99.43 | 97.29 | 99.58 | 87.24 | a | 78.68 | 71.17 | 59.58 | 82.18 | a | |||||||||
1987 | 57.70 | a | 62.43 | 67.84 | 84.20 | 87.16 | 101.53 | 100.94 | 98.77 | 94.90 | 88.16 | 69.10 | 55.84 | 80.71 | ||||||||||||
1988 | 59.65 | 70.10 | 74.90 | 78.47 | 88.84 | 99.47 | 102.87 | 96.58 | 93.47 | 89.29 | 73.13 | 63.71 | 82.54 | |||||||||||||
1989 | 60.48 | 68.46 | 78.52 | 89.43 | 91.74 | 100.17 | 104.87 | 100.19 | 98.00 | 88.00 | 81.60 | 69.39 | 85.90 | |||||||||||||
1990 | 64.61 | 66.57 | 72.77 | 81.13 | 87.33 | a | 103.50 | 100.33 | a | 97.77 | 93.93 | 91.13 | 77.27 | 58.68 | 82.92 | |||||||||||
1991 | 63.90 | 78.18 | 63.81 | 79.37 | 87.39 | 94.20 | 102.87 | 101.42 | 96.07 | 89.71 | 66.97 | 55.81 | 81.64 | |||||||||||||
1992 | 57.70 | a | 65.24 | 66.77 | 81.69 | a | 85.45 | 95.23 | 98.13 | 94.42 | 92.27 | 84.84 | 66.17 | 55.10 | 78.58 | |||||||||||
1993 | 58.58 | 60.00 | 72.16 | 80.73 | 89.35 | 97.37 | 100.68 | 98.32 | 92.93 | 80.10 | a | 65.00 | 61.45 | 79.72 | ||||||||||||
1994 | 64.13 | 63.39 | 72.90 | 79.20 | 86.55 | 102.80 | 103.42 | 102.87 | 95.63 | 81.10 | 64.97 | 61.42 | 81.53 | |||||||||||||
1995 | 57.27 | a | 69.79 | 70.45 | 74.70 | 82.48 | 95.87 | 104.16 | 102.68 | 95.43 | 86.61 | 75.57 | 64.26 | 81.61 | ||||||||||||
1996 | 65.13 | 70.69 | 73.29 | 84.40 | 93.42 | 102.33 | 102.81 | 101.39 | 89.07 | 82.13 | 71.33 | 63.32 | 83.28 | |||||||||||||
1997 | 59.06 | 66.14 | 77.87 | 75.10 | 93.97 | 96.87 | 103.26 | 97.81 | 92.57 | 80.65 | 71.17 | 56.61 | 80.92 | |||||||||||||
1998 | 62.00 | 57.89 | 65.84 | 71.20 | 83.87 | 94.83 | 100.87 | 101.48 | 92.41 | a | 82.42 | 70.57 | 61.58 | 78.75 | ||||||||||||
1999 | 66.03 | 71.04 | 76.16 | 73.59 | a | 88.29 | 98.40 | 98.23 | 100.58 | 92.69 | a | 87.55 | 78.43 | 63.77 | 82.90 | |||||||||||
2000 | 66.06 | 70.76 | 70.58 | 84.77 | 95.71 | 101.93 | 105.39 | 100.65 | 97.23 | 79.32 | 62.37 | 65.16 | 83.33 | |||||||||||||
2001 | 58.32 | 63.82 | 70.84 | 77.53 | 95.29 | 102.77 | 102.65 | 100.32 | 99.17 | 87.29 | 73.93 | 57.87 | 82.48 | |||||||||||||
2002 | 62.55 | 70.75 | 73.77 | 86.13 | 92.55 | 104.87 | 104.61 | 103.13 | 95.67 | 80.61 | 71.57 | 59.26 | 83.79 | |||||||||||||
2003 | 69.10 | 63.93 | a | 69.45 | 78.00 | 91.68 | 101.40 | 107.10 | 99.84 | 94.60 | 90.29 | 66.37 | 61.77 | 82.79 | ||||||||||||
2004 | 61.23 | 61.14 | 79.74 | 79.07 | 92.13 | a | 100.60 | 102.17 | a | 98.10 | a | 94.57 | 79.10 | 64.13 | 59.29 | 80.94 | ||||||||||
2005 | 59.65 | 61.93 | 70.68 | 79.23 | 90.45 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 72.39 | g | |||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 60.18 | 65.14 | 70.50 | 78.95 | 88.60 | 98.48 | 101.89 | 98.93 | 94.42 | 84.23 | 70.59 | 60.97 | 81.24 | |||||||||||||
S.D. | 4.12 | 4.43 | 4.76 | 4.21 | 3.68 | 3.02 | 2.80 | 2.59 | 3.02 | 4.46 | 4.46 | 4.37 | 1.65 | |||||||||||||
SKEW | -0.73 | 0.12 | -0.09 | -0.11 | -0.33 | 0.04 | -2.00 | -0.48 | -0.04 | -0.16 | -0.18 | 0.13 | 0.16 | |||||||||||||
MAX | 69.10 | 78.18 | 81.74 | 89.43 | 95.71 | 105.53 | 107.10 | 104.45 | 102.73 | 93.83 | 81.60 | 71.68 | 85.90 | |||||||||||||
MIN | 46.47 | 55.11 | 55.94 | 70.47 | 79.77 | 91.23 | 87.28 | 90.61 | 87.24 | 73.74 | 57.63 | 51.97 | 78.05 | |||||||||||||
YRS | 86 | 88 | 89 | 87 | 87 | 88 | 84 | 85 | 82 | 84 | 83 | 88 | 68 |