Year Month Day AO index 2004 FEB 1 -0.962 2004 FEB 2 -1.305 2004 FEB 3 -0.577 2004 FEB 4 0.392 2004 FEB 5 0.494 2004 FEB 6 0.082 2004 FEB 7 -0.337 2004 FEB 8 -0.608 2004 FEB 9 -0.017 2004 FEB 10 0.127 2004 FEB 11 -0.519 2004 FEB 12 -0.601 2004 FEB 13 -1.069 2004 FEB 14 -1.838 2004 FEB 15 -2.096 2004 FEB 16 -1.800 2004 FEB 17 -1.466 2004 FEB 18 -1.643 2004 FEB 19 -1.907 2004 FEB 20 -2.137 2004 FEB 21 -2.454 2004 FEB 22 -2.345 2004 FEB 23 -2.465 2004 FEB 24 -2.818 2004 FEB 25 -3.202 2004 FEB 26 -3.109 2004 FEB 27 -3.130 2004 FEB 28 -3.043 2004 FEB 29 -2.396 2004 MAR 1 -1.614 2004 MAR 2 -0.908 2004 MAR 3 -0.129 2004 MAR 4 0.214 2004 MAR 5 0.168 2004 MAR 6 0.737 2004 MAR 7 1.098 2004 MAR 8 0.482 2004 MAR 9 0.148 2004 MAR 10 0.919 2004 MAR 11 0.763 2004 MAR 12 0.268 2004 MAR 13 0.534 2004 MAR 14 1.359 2004 MAR 15 2.179 2004 MAR 16 2.562 2004 MAR 17 2.597 2004 MAR 18 2.358 2004 MAR 19 2.095 2004 MAR 20 1.746 2004 MAR 21 0.559 2004 MAR 22 -0.845 2004 MAR 23 -1.603 2004 MAR 24 -2.171 2004 MAR 25 -1.550 2004 MAR 26 -0.203 2004 MAR 27 0.276 2004 MAR 28 -0.273 2004 MAR 29 -0.611 2004 MAR 30 -0.831 2004 MAR 31 -0.817 2004 APR 1 -0.729 2004 APR 2 0.153 2004 APR 3 1.154 2004 APR 4 0.492 2004 APR 5 -0.663 2004 APR 6 -1.465 2004 APR 7 -1.814 2004 APR 8 -1.962 2004 APR 9 -1.981 2004 APR 10 -1.688 2004 APR 11 -1.079 2004 APR 12 -0.215 2004 APR 13 0.429 2004 APR 14 0.171 2004 APR 15 -0.065 2004 APR 16 0.657 2004 APR 17 0.908 2004 APR 18 0.056 2004 APR 19 -0.492 2004 APR 20 -1.255 2004 APR 21 -1.348 2004 APR 22 -0.803 2004 APR 23 -0.244 2004 APR 24 0.364 2004 APR 25 0.454 2004 APR 26 0.504 2004 APR 27 0.062 2004 APR 28 -0.456 2004 APR 29 -0.556 2004 APR 30 -0.436 2004 MAY 1 -0.237 2004 MAY 2 0.231 2004 MAY 3 0.996 2004 MAY 4 0.542 2004 MAY 5 -0.397 2004 MAY 6 -0.940 2004 MAY 7 -1.016 2004 MAY 8 -1.193 2004 MAY 9 -0.784 2004 MAY 10 -0.415 2004 MAY 11 -0.323 2004 MAY 12 -0.302 2004 MAY 13 -0.231 2004 MAY 14 0.134 2004 MAY 15 0.304 2004 MAY 16 0.410 2004 MAY 17 0.854 2004 MAY 18 0.976 2004 MAY 19 0.810 2004 MAY 20 0.492 2004 MAY 21 0.343 2004 MAY 22 -0.154 2004 MAY 23 -0.669 2004 MAY 24 -0.921 2004 MAY 25 -0.338 2004 MAY 26 0.330 2004 MAY 27 0.246 2004 MAY 28 0.056 2004 MAY 29 -0.313 2004 MAY 30 -0.620 2004 MAY 31 -0.692