Monthly version: Walker and Bliss Southern Oscillation Indices 1 -999 1875 1933 Monthly version: Walker and Bliss Southern Oscillation Indices http://jisao.washington.edu/data/walker/ Standardized with respect to 1882-1929 and multiplied by 100. 1875 1933 1 jan feb mar apr may jun jul aug sep oct nov dec 1875 -999 -999 143 143 143 49 49 49 -27 -27 -27 -999 1876 -999 -999 24 24 24 -50 -50 -50 -5 -5 -5 -999 1877 -999 -999 -285 -285 -285 -398 -398 -398 -205 -205 -205 -999 1878 -999 -999 -237 -237 -237 124 124 124 129 129 129 -999 1879 -999 -999 167 167 167 149 149 149 62 62 62 -999 1880 -999 -999 72 72 72 -100 -100 -100 -5 -5 -5 -999 1881 -999 -999 0 0 0 -50 -50 -50 40 40 40 -43 1882 -42 -42 96 96 96 -1 -1 -1 84 84 84 45 1883 45 45 -23 -23 -23 -1 -1 -1 40 40 40 -87 1884 -86 -86 -47 -47 -47 -50 -50 -50 -27 -27 -27 -65 1885 -64 -64 -166 -166 -166 -50 -50 -50 -116 -116 -116 -43 1886 -42 -42 48 48 48 99 99 99 107 107 107 132 1887 133 133 143 143 143 24 24 24 -5 -5 -5 1 1888 1 1 -23 -23 -23 -125 -125 -125 -160 -160 -160 -174 1889 -174 -174 -71 -71 -71 99 99 99 129 129 129 154 1890 154 154 143 143 143 124 124 124 62 62 62 1 1891 1 1 -118 -118 -118 -125 -125 -125 -71 -71 -71 -43 1892 -42 -42 167 167 167 174 174 174 151 151 151 88 1893 89 89 119 119 119 149 149 149 84 84 84 110 1894 111 111 143 143 143 99 99 99 62 62 62 67 1895 67 67 119 119 119 24 24 24 -71 -71 -71 1 1896 1 1 48 48 48 -50 -50 -50 107 107 107 -87 1897 -86 -86 -71 -71 -71 -1 -1 -1 -5 -5 -5 45 1898 45 45 24 24 24 -1 -1 -1 107 107 107 45 1899 45 45 -23 -23 -23 -175 -175 -175 -116 -116 -116 -87 1900 -86 -86 -214 -214 -214 -50 -50 -50 -27 -27 -27 -87 1901 -86 -86 -47 -47 -47 -50 -50 -50 -49 -49 -49 -87 1902 -86 -86 -95 -95 -95 -125 -125 -125 -227 -227 -227 -174 1903 -174 -174 -95 -95 -95 49 49 49 84 84 84 110 1904 111 111 24 24 24 -150 -150 -150 -27 -27 -27 -109 1905 -108 -108 -214 -214 -214 -150 -150 -150 -94 -94 -94 -87 1906 -86 -86 -71 -71 -71 74 74 74 84 84 84 132 1907 133 133 -95 -95 -95 -100 -100 -100 18 18 18 1 1908 1 1 24 24 24 49 49 49 62 62 62 45 1909 45 45 96 96 96 149 149 149 107 107 107 110 1910 111 111 119 119 119 124 124 124 129 129 129 110 1911 111 111 0 0 0 -100 -100 -100 -94 -94 -94 -152 1912 -152 -152 -71 -71 -71 -1 -1 -1 18 18 18 1 1913 1 1 72 72 72 -125 -125 -125 -116 -116 -116 -130 1914 -130 -130 -118 -118 -118 -100 -100 -100 -205 -205 -205 -130 1915 -130 -130 -118 -118 -118 -25 -25 -25 129 129 129 88 1916 89 89 143 143 143 223 223 223 151 151 151 198 1917 198 198 167 167 167 223 223 223 151 151 151 198 1918 198 198 0 0 0 -150 -150 -150 -138 -138 -138 -152 1919 -152 -152 -142 -142 -142 -100 -100 -100 -71 -71 -71 -65 1920 -64 -64 -71 -71 -71 -25 -25 -25 84 84 84 88 1921 89 89 96 96 96 74 74 74 -49 -49 -49 45 1922 45 45 48 48 48 24 24 24 18 18 18 45 1923 45 45 -23 -23 -23 -25 -25 -25 -49 -49 -49 -43 1924 -42 -42 24 24 24 99 99 99 40 40 40 88 1925 89 89 0 0 0 -25 -25 -25 -183 -183 -183 -174 1926 -174 -174 -95 -95 -95 -25 -25 -25 -27 -27 -27 45 1927 45 45 72 72 72 24 24 24 -71 -71 -71 -21 1928 -20 -20 48 48 48 24 24 24 40 40 40 23 1929 23 23 24 24 24 -25 -25 -25 -49 -49 -49 -21 1930 -20 -20 -23 -23 -23 -100 -100 -100 -183 -183 -183 -999 1931 -999 -999 24 24 24 -999 -999 -999 -27 -27 -27 -999 1932 -999 -999 -47 -47 -47 -999 -999 -999 18 18 18 -999 1933 -999 -999 0 0 0 -999 -999 -999 40 40 40 -999