Year Month Day AO index 2009 MAY 1 1.701 2009 MAY 2 1.708 2009 MAY 3 2.083 2009 MAY 4 2.347 2009 MAY 5 2.554 2009 MAY 6 2.420 2009 MAY 7 1.775 2009 MAY 8 1.458 2009 MAY 9 1.391 2009 MAY 10 1.119 2009 MAY 11 0.604 2009 MAY 12 0.342 2009 MAY 13 0.008 2009 MAY 14 -0.094 2009 MAY 15 -0.255 2009 MAY 16 -0.639 2009 MAY 17 -0.311 2009 MAY 18 0.343 2009 MAY 19 0.954 2009 MAY 20 1.443 2009 MAY 21 1.588 2009 MAY 22 1.489 2009 MAY 23 1.464 2009 MAY 24 1.971 2009 MAY 25 2.074 2009 MAY 26 2.008 2009 MAY 27 2.005 2009 MAY 28 2.045 2009 MAY 29 1.223 2009 MAY 30 -0.052 2009 MAY 31 -1.081 2009 JUN 1 -1.490 2009 JUN 2 -1.562 2009 JUN 3 -1.759 2009 JUN 4 -1.793 2009 JUN 5 -1.569 2009 JUN 6 -1.277 2009 JUN 7 -1.371 2009 JUN 8 -1.460 2009 JUN 9 -1.438 2009 JUN 10 -1.295 2009 JUN 11 -1.059 2009 JUN 12 -0.967 2009 JUN 13 -1.152 2009 JUN 14 -1.069 2009 JUN 15 -0.704 2009 JUN 16 -0.115 2009 JUN 17 0.171 2009 JUN 18 0.019 2009 JUN 19 -0.217 2009 JUN 20 -0.336 2009 JUN 21 -0.744 2009 JUN 22 -1.259 2009 JUN 23 -1.683 2009 JUN 24 -1.743 2009 JUN 25 -1.942 2009 JUN 26 -2.149 2009 JUN 27 -2.149 2009 JUN 28 -2.264 2009 JUN 29 -2.406 2009 JUN 30 -2.300 2009 JUL 1 -2.136 2009 JUL 2 -2.152 2009 JUL 3 -2.027 2009 JUL 4 -1.751 2009 JUL 5 -1.837 2009 JUL 6 -1.866 2009 JUL 7 -1.634 2009 JUL 8 -1.307 2009 JUL 9 -1.060 2009 JUL 10 -1.020 2009 JUL 11 -1.131 2009 JUL 12 -1.251 2009 JUL 13 -1.482 2009 JUL 14 -1.392 2009 JUL 15 -1.185 2009 JUL 16 -1.066 2009 JUL 17 -0.706 2009 JUL 18 -0.590 2009 JUL 19 -0.758 2009 JUL 20 -1.142 2009 JUL 21 -1.624 2009 JUL 22 -1.661 2009 JUL 23 -1.497 2009 JUL 24 -1.327 2009 JUL 25 -1.400 2009 JUL 26 -1.511 2009 JUL 27 -1.100 2009 JUL 28 -0.704 2009 JUL 29 -0.591 2009 JUL 30 -0.747 2009 JUL 31 -0.886 2009 AUG 1 -0.777 2009 AUG 2 -1.148 2009 AUG 3 -1.464 2009 AUG 4 -1.348 2009 AUG 5 -0.885 2009 AUG 6 -0.665 2009 AUG 7 -0.555 2009 AUG 8 -0.263 2009 AUG 9 -0.053 2009 AUG 10 -0.058 2009 AUG 11 -0.021 2009 AUG 12 0.049 2009 AUG 13 0.412 2009 AUG 14 0.567 2009 AUG 15 0.457 2009 AUG 16 0.408 2009 AUG 17 0.631 2009 AUG 18 0.955 2009 AUG 19 0.972 2009 AUG 20 0.689 2009 AUG 21 0.390 2009 AUG 22 -0.222 2009 AUG 23 -0.745 2009 AUG 24 -0.825 2009 AUG 25 -0.846 2009 AUG 26 -0.794 2009 AUG 27 -0.620 2009 AUG 28 -0.233 2009 AUG 29 0.749 2009 AUG 30 1.656 2009 AUG 31 1.980