Year Month Day AO index 2001 FEB 1 -1.076 2001 FEB 2 -0.479 2001 FEB 3 -0.894 2001 FEB 4 -1.279 2001 FEB 5 -1.447 2001 FEB 6 -1.782 2001 FEB 7 -1.106 2001 FEB 8 -0.362 2001 FEB 9 0.517 2001 FEB 10 0.864 2001 FEB 11 1.463 2001 FEB 12 2.362 2001 FEB 13 2.884 2001 FEB 14 2.939 2001 FEB 15 2.462 2001 FEB 16 1.861 2001 FEB 17 1.260 2001 FEB 18 0.494 2001 FEB 19 0.806 2001 FEB 20 0.654 2001 FEB 21 -0.535 2001 FEB 22 -2.382 2001 FEB 23 -3.373 2001 FEB 24 -4.035 2001 FEB 25 -4.854 2001 FEB 26 -4.605 2001 FEB 27 -3.988 2001 FEB 28 -3.179 2001 MAR 1 -3.430 2001 MAR 2 -3.244 2001 MAR 3 -3.430 2001 MAR 4 -3.396 2001 MAR 5 -3.358 2001 MAR 6 -3.206 2001 MAR 7 -2.402 2001 MAR 8 -1.399 2001 MAR 9 -0.102 2001 MAR 10 0.908 2001 MAR 11 1.575 2001 MAR 12 1.575 2001 MAR 13 1.042 2001 MAR 14 -0.426 2001 MAR 15 -1.880 2001 MAR 16 -2.437 2001 MAR 17 -2.350 2001 MAR 18 -2.300 2001 MAR 19 -2.305 2001 MAR 20 -2.194 2001 MAR 21 -2.191 2001 MAR 22 -2.811 2001 MAR 23 -3.567 2001 MAR 24 -4.202 2001 MAR 25 -3.952 2001 MAR 26 -2.604 2001 MAR 27 -1.058 2001 MAR 28 -0.146 2001 MAR 29 0.657 2001 MAR 30 1.104 2001 MAR 31 1.104 2001 APR 1 0.916 2001 APR 2 0.624 2001 APR 3 1.087 2001 APR 4 2.352 2001 APR 5 2.752 2001 APR 6 2.192 2001 APR 7 1.424 2001 APR 8 1.009 2001 APR 9 0.478 2001 APR 10 0.133 2001 APR 11 0.361 2001 APR 12 0.901 2001 APR 13 0.882 2001 APR 14 0.389 2001 APR 15 -0.173 2001 APR 16 -0.328 2001 APR 17 -0.403 2001 APR 18 -0.249 2001 APR 19 -0.226 2001 APR 20 0.427 2001 APR 21 1.241 2001 APR 22 1.395 2001 APR 23 1.040 2001 APR 24 0.874 2001 APR 25 1.027 2001 APR 26 1.462 2001 APR 27 1.079 2001 APR 28 0.620 2001 APR 29 1.017 2001 APR 30 1.908 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