Year Month Day AO index 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 2004 JUN 1 -0.969 2004 JUN 2 -1.134 2004 JUN 3 -0.655 2004 JUN 4 -0.328 2004 JUN 5 -0.091 2004 JUN 6 0.188 2004 JUN 7 0.385 2004 JUN 8 0.795 2004 JUN 9 1.118 2004 JUN 10 0.808 2004 JUN 11 0.294 2004 JUN 12 0.408 2004 JUN 13 1.092 2004 JUN 14 1.654 2004 JUN 15 1.319 2004 JUN 16 0.661 2004 JUN 17 -0.066 2004 JUN 18 -0.350 2004 JUN 19 -0.746 2004 JUN 20 -1.250 2004 JUN 21 -1.627 2004 JUN 22 -1.839 2004 JUN 23 -1.631 2004 JUN 24 -1.299 2004 JUN 25 -0.877 2004 JUN 26 -0.656 2004 JUN 27 -0.459 2004 JUN 28 -0.535 2004 JUN 29 -0.522 2004 JUN 30 -0.517 2004 JUL 1 -0.477 2004 JUL 2 -0.405 2004 JUL 3 -0.265 2004 JUL 4 -0.058 2004 JUL 5 0.172 2004 JUL 6 0.249 2004 JUL 7 -0.063 2004 JUL 8 0.039 2004 JUL 9 0.018 2004 JUL 10 -0.074 2004 JUL 11 -0.049 2004 JUL 12 -0.024 2004 JUL 13 0.195 2004 JUL 14 0.254 2004 JUL 15 -0.086 2004 JUL 16 -0.457 2004 JUL 17 -0.630 2004 JUL 18 -0.305 2004 JUL 19 -0.060 2004 JUL 20 -0.276 2004 JUL 21 -0.503 2004 JUL 22 -0.804 2004 JUL 23 -0.708 2004 JUL 24 -0.244 2004 JUL 25 0.025 2004 JUL 26 -0.172 2004 JUL 27 -0.352 2004 JUL 28 -0.332 2004 JUL 29 -0.118 2004 JUL 30 -0.172 2004 JUL 31 -0.317 2004 AUG 1 -0.421 2004 AUG 2 -0.842 2004 AUG 3 -1.051 2004 AUG 4 -1.239 2004 AUG 5 -1.388 2004 AUG 6 -1.295 2004 AUG 7 -1.392 2004 AUG 8 -1.514 2004 AUG 9 -1.634 2004 AUG 10 -1.691 2004 AUG 11 -1.442 2004 AUG 12 -1.134 2004 AUG 13 -0.822 2004 AUG 14 -0.330 2004 AUG 15 0.145 2004 AUG 16 0.126 2004 AUG 17 -0.647 2004 AUG 18 -1.311 2004 AUG 19 -1.428 2004 AUG 20 -1.060 2004 AUG 21 -1.014 2004 AUG 22 -0.958 2004 AUG 23 -0.667 2004 AUG 24 -0.297 2004 AUG 25 -0.093 2004 AUG 26 0.198 2004 AUG 27 0.490 2004 AUG 28 0.491 2004 AUG 29 0.276 2004 AUG 30 0.288 2004 AUG 31 0.122