Year Month Day AO index 2001 MAY 1 2.517 2001 MAY 2 2.520 2001 MAY 3 2.485 2001 MAY 4 2.172 2001 MAY 5 1.703 2001 MAY 6 1.351 2001 MAY 7 1.247 2001 MAY 8 1.335 2001 MAY 9 1.190 2001 MAY 10 0.324 2001 MAY 11 -0.420 2001 MAY 12 -1.346 2001 MAY 13 -1.823 2001 MAY 14 -1.983 2001 MAY 15 -1.602 2001 MAY 16 -0.951 2001 MAY 17 -0.319 2001 MAY 18 0.169 2001 MAY 19 0.211 2001 MAY 20 0.004 2001 MAY 21 -0.331 2001 MAY 22 -0.676 2001 MAY 23 -0.726 2001 MAY 24 -0.265 2001 MAY 25 0.200 2001 MAY 26 0.429 2001 MAY 27 0.552 2001 MAY 28 0.787 2001 MAY 29 1.204 2001 MAY 30 1.632 2001 MAY 31 1.916 2001 JUN 1 1.792 2001 JUN 2 1.196 2001 JUN 3 0.624 2001 JUN 4 0.556 2001 JUN 5 0.733 2001 JUN 6 0.556 2001 JUN 7 0.197 2001 JUN 8 0.556 2001 JUN 9 -0.486 2001 JUN 10 -0.462 2001 JUN 11 -0.201 2001 JUN 12 -0.094 2001 JUN 13 -0.412 2001 JUN 14 -0.961 2001 JUN 15 -1.301 2001 JUN 16 -1.468 2001 JUN 17 -1.142 2001 JUN 18 -0.514 2001 JUN 19 -0.035 2001 JUN 20 0.084 2001 JUN 21 0.126 2001 JUN 22 0.017 2001 JUN 23 -0.222 2001 JUN 24 -0.278 2001 JUN 25 -0.177 2001 JUN 26 0.004 2001 JUN 27 0.050 2001 JUN 28 0.028 2001 JUN 29 0.286 2001 JUN 30 0.502 2001 JUL 1 0.397 2001 JUL 2 0.301 2001 JUL 3 0.198 2001 JUL 4 0.475 2001 JUL 5 0.843 2001 JUL 6 0.633 2001 JUL 7 0.259 2001 JUL 8 -0.208 2001 JUL 9 -0.376 2001 JUL 10 -0.560 2001 JUL 11 -0.651 2001 JUL 12 -0.439 2001 JUL 13 -0.251 2001 JUL 14 -0.165 2001 JUL 15 -0.298 2001 JUL 16 -0.639 2001 JUL 17 -1.021 2001 JUL 18 -1.295 2001 JUL 19 -1.133 2001 JUL 20 -0.578 2001 JUL 21 -0.273 2001 JUL 22 -0.170 2001 JUL 23 -0.264 2001 JUL 24 -0.448 2001 JUL 25 -0.458 2001 JUL 26 -0.167 2001 JUL 27 0.347 2001 JUL 28 1.133 2001 JUL 29 1.424 2001 JUL 30 1.233 2001 JUL 31 1.221 2001 AUG 1 1.301 2001 AUG 2 1.673 2001 AUG 3 1.661 2001 AUG 4 1.433 2001 AUG 5 1.020 2001 AUG 6 0.715 2001 AUG 7 0.593 2001 AUG 8 0.584 2001 AUG 9 0.699 2001 AUG 10 1.110 2001 AUG 11 1.668 2001 AUG 12 2.142 2001 AUG 13 2.016 2001 AUG 14 1.580 2001 AUG 15 1.315 2001 AUG 16 1.398 2001 AUG 17 1.545 2001 AUG 18 1.432 2001 AUG 19 0.827 2001 AUG 20 0.330 2001 AUG 21 -0.347 2001 AUG 22 -0.741 2001 AUG 23 -0.832 2001 AUG 24 -0.978 2001 AUG 25 -1.074 2001 AUG 26 -1.025 2001 AUG 27 -0.676 2001 AUG 28 -0.651 2001 AUG 29 -1.115 2001 AUG 30 -1.177 2001 AUG 31 -0.864