Year Month Day AO index 2004 JAN 1 -0.523 2004 JAN 2 -0.186 2004 JAN 3 0.065 2004 JAN 4 0.007 2004 JAN 5 -0.383 2004 JAN 6 -0.858 2004 JAN 7 -1.227 2004 JAN 8 -1.327 2004 JAN 9 -1.121 2004 JAN 10 -0.630 2004 JAN 11 -0.205 2004 JAN 12 -0.352 2004 JAN 13 -0.958 2004 JAN 14 -1.914 2004 JAN 15 -2.968 2004 JAN 16 -3.855 2004 JAN 17 -4.387 2004 JAN 18 -3.890 2004 JAN 19 -3.382 2004 JAN 20 -2.783 2004 JAN 21 -1.191 2004 JAN 22 0.285 2004 JAN 23 0.655 2004 JAN 24 -0.776 2004 JAN 25 -2.152 2004 JAN 26 -3.008 2004 JAN 27 -3.012 2004 JAN 28 -3.019 2004 JAN 29 -3.267 2004 JAN 30 -2.557 2004 JAN 31 -1.487 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