Year Month Day AO index 2008 MAY 1 -2.528 2008 MAY 2 -2.926 2008 MAY 3 -2.663 2008 MAY 4 -1.824 2008 MAY 5 -1.591 2008 MAY 6 -1.475 2008 MAY 7 -1.676 2008 MAY 8 -1.826 2008 MAY 9 -1.632 2008 MAY 10 -1.192 2008 MAY 11 -1.020 2008 MAY 12 -1.298 2008 MAY 13 -1.510 2008 MAY 14 -1.412 2008 MAY 15 -0.806 2008 MAY 16 -0.923 2008 MAY 17 -1.698 2008 MAY 18 -1.701 2008 MAY 19 -1.529 2008 MAY 20 -1.328 2008 MAY 21 -0.957 2008 MAY 22 -1.134 2008 MAY 23 -1.698 2008 MAY 24 -1.406 2008 MAY 25 -0.355 2008 MAY 26 0.239 2008 MAY 27 0.317 2008 MAY 28 0.122 2008 MAY 29 0.460 2008 MAY 30 0.546 2008 MAY 31 0.403 2008 JUN 1 0.233 2008 JUN 2 0.078 2008 JUN 3 -0.061 2008 JUN 4 -0.368 2008 JUN 5 -0.168 2008 JUN 6 0.102 2008 JUN 7 0.134 2008 JUN 8 0.428 2008 JUN 9 0.515 2008 JUN 10 0.470 2008 JUN 11 0.290 2008 JUN 12 0.033 2008 JUN 13 -0.260 2008 JUN 14 -0.001 2008 JUN 15 0.124 2008 JUN 16 0.038 2008 JUN 17 -0.024 2008 JUN 18 -0.056 2008 JUN 19 0.038 2008 JUN 20 -0.239 2008 JUN 21 -0.345 2008 JUN 22 -0.009 2008 JUN 23 0.308 2008 JUN 24 0.002 2008 JUN 25 -0.445 2008 JUN 26 -0.461 2008 JUN 27 -0.513 2008 JUN 28 -0.776 2008 JUN 29 -0.737 2008 JUN 30 -0.933 2008 JUL 1 -1.341 2008 JUL 2 -1.708 2008 JUL 3 -2.164 2008 JUL 4 -2.209 2008 JUL 5 -1.619 2008 JUL 6 -0.869 2008 JUL 7 -0.220 2008 JUL 8 0.023 2008 JUL 9 -0.017 2008 JUL 10 -0.198 2008 JUL 11 -0.054 2008 JUL 12 0.561 2008 JUL 13 0.867 2008 JUL 14 0.858 2008 JUL 15 1.123 2008 JUL 16 1.047 2008 JUL 17 0.857 2008 JUL 18 0.485 2008 JUL 19 0.035 2008 JUL 20 -0.078 2008 JUL 21 -0.028 2008 JUL 22 0.005 2008 JUL 23 -0.108 2008 JUL 24 -0.431 2008 JUL 25 -0.867 2008 JUL 26 -1.140 2008 JUL 27 -1.373 2008 JUL 28 -1.508 2008 JUL 29 -1.509 2008 JUL 30 -1.311 2008 JUL 31 -1.463 2008 AUG 1 -1.428 2008 AUG 2 -1.031 2008 AUG 3 -0.736 2008 AUG 4 -0.914 2008 AUG 5 -1.149 2008 AUG 6 -1.074 2008 AUG 7 -0.796 2008 AUG 8 -0.538 2008 AUG 9 -0.058 2008 AUG 10 0.434 2008 AUG 11 0.293 2008 AUG 12 -0.114 2008 AUG 13 0.015 2008 AUG 14 0.671 2008 AUG 15 0.876 2008 AUG 16 0.356 2008 AUG 17 -0.366 2008 AUG 18 -0.463 2008 AUG 19 0.056 2008 AUG 20 0.136 2008 AUG 21 0.584 2008 AUG 22 1.311 2008 AUG 23 1.361 2008 AUG 24 0.885 2008 AUG 25 0.493 2008 AUG 26 0.364 2008 AUG 27 0.242 2008 AUG 28 -0.007 2008 AUG 29 -0.309 2008 AUG 30 -0.581 2008 AUG 31 -0.922