Year Month Day AO index 2009 FEB 1 -2.870 2009 FEB 2 -3.024 2009 FEB 3 -3.178 2009 FEB 4 -2.928 2009 FEB 5 -1.718 2009 FEB 6 -0.696 2009 FEB 7 0.212 2009 FEB 8 0.208 2009 FEB 9 -0.588 2009 FEB 10 -1.023 2009 FEB 11 -1.486 2009 FEB 12 -2.165 2009 FEB 13 -2.466 2009 FEB 14 -2.436 2009 FEB 15 -1.493 2009 FEB 16 -0.456 2009 FEB 17 -0.220 2009 FEB 18 -0.702 2009 FEB 19 -0.219 2009 FEB 20 0.355 2009 FEB 21 -0.010 2009 FEB 22 -0.093 2009 FEB 23 -0.155 2009 FEB 24 0.383 2009 FEB 25 1.532 2009 FEB 26 2.556 2009 FEB 27 2.232 2009 FEB 28 2.290 2009 MAR 1 2.296 2009 MAR 2 1.968 2009 MAR 3 1.698 2009 MAR 4 0.846 2009 MAR 5 0.494 2009 MAR 6 0.998 2009 MAR 7 1.009 2009 MAR 8 0.118 2009 MAR 9 -0.473 2009 MAR 10 -0.694 2009 MAR 11 -0.684 2009 MAR 12 -0.216 2009 MAR 13 0.104 2009 MAR 14 0.366 2009 MAR 15 0.161 2009 MAR 16 -0.097 2009 MAR 17 -0.523 2009 MAR 18 -0.497 2009 MAR 19 -0.522 2009 MAR 20 -0.353 2009 MAR 21 -0.251 2009 MAR 22 -0.100 2009 MAR 23 0.097 2009 MAR 24 -0.069 2009 MAR 25 0.044 2009 MAR 26 0.446 2009 MAR 27 0.266 2009 MAR 28 -0.081 2009 MAR 29 -0.504 2009 MAR 30 -0.190 2009 MAR 31 -0.054 2009 APR 1 0.318 2009 APR 2 0.898 2009 APR 3 0.795 2009 APR 4 0.434 2009 APR 5 0.253 2009 APR 6 0.604 2009 APR 7 1.030 2009 APR 8 0.670 2009 APR 9 0.373 2009 APR 10 0.667 2009 APR 11 0.803 2009 APR 12 0.809 2009 APR 13 0.160 2009 APR 14 -0.559 2009 APR 15 -0.783 2009 APR 16 -0.537 2009 APR 17 -0.108 2009 APR 18 0.165 2009 APR 19 0.851 2009 APR 20 1.436 2009 APR 21 1.684 2009 APR 22 1.614 2009 APR 23 1.692 2009 APR 24 1.859 2009 APR 25 2.220 2009 APR 26 2.527 2009 APR 27 2.630 2009 APR 28 2.498 2009 APR 29 1.682 2009 APR 30 1.450 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