NAO_INDEX (NCEP1) ** undef = -9.99e+08 year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 1948 0.277 -0.099 0.930 0.553 0.352 -1.020 -0.196 -1.070 1.079 0.772 -0.454 -0.287 1949 1.098 1.030 0.072 2.411 0.717 -0.437 0.443 0.312 -0.906 0.687 -0.566 0.467 1950 -0.487 0.772 -0.038 0.369 -1.191 -0.288 -1.952 -1.830 1.643 0.582 -0.117 -0.534 1951 0.591 0.134 -0.966 0.131 -1.406 -1.399 0.927 -1.331 -0.560 0.684 -0.522 1.083 1952 0.870 -0.910 -1.246 0.583 -1.437 -0.167 0.979 -0.352 -1.477 -0.395 0.819 -0.711 1953 -0.364 -0.404 0.548 -1.257 -0.901 0.427 -0.995 -0.858 -0.098 1.157 0.060 0.570 1954 -0.405 -0.042 -0.500 0.630 -1.614 -0.233 -0.369 -1.097 1.583 1.268 -0.698 0.899 1955 -0.807 -1.319 -1.329 0.599 0.193 -0.556 2.746 1.580 0.444 -0.931 0.226 -0.161 1956 -0.149 -1.781 -0.413 -0.933 1.883 0.717 -0.923 -1.523 -0.378 0.489 0.933 0.221 1957 0.647 -0.240 -1.117 0.862 -0.738 -1.368 -0.527 0.136 -1.001 1.615 0.069 0.700 1958 -0.033 -0.971 -1.756 0.094 0.296 -1.251 -1.662 -1.452 -0.613 0.683 0.406 -0.759 1959 -1.046 0.710 0.115 -0.504 -0.840 0.288 0.563 1.052 -0.281 0.149 -0.632 0.218 1960 -1.527 -1.335 -1.375 0.871 -0.461 0.179 -1.340 -0.961 -0.497 -2.247 -1.871 0.707 1961 0.057 0.869 0.793 -0.622 -0.583 1.738 -0.132 -0.473 0.788 -0.455 0.615 -1.507 1962 0.995 -0.138 -2.234 0.637 -0.563 0.669 -0.779 -1.243 0.440 0.781 0.966 -0.374 1963 -2.304 -1.155 -0.823 -0.543 2.249 -0.480 -0.018 -0.935 0.971 1.538 -1.105 -1.234 1964 -1.009 -0.890 -1.258 -0.228 0.811 0.536 1.756 -0.333 0.546 -0.065 0.360 0.195 1965 -0.128 -2.585 -0.772 0.781 -1.058 0.316 -1.018 -0.949 -0.157 0.163 -0.761 0.183 1966 -1.268 -0.841 0.384 -0.997 1.674 0.418 0.462 -0.758 0.407 -1.493 1.611 0.934 1967 -1.234 0.614 1.421 1.632 -0.302 1.510 0.080 -0.288 -0.386 1.400 1.055 -0.130 1968 0.306 -0.904 0.873 -1.026 -1.028 0.034 -0.351 0.492 -0.933 -0.268 -1.341 -0.750 1969 -1.472 -1.632 -1.198 0.728 -0.801 0.425 1.144 0.708 1.302 1.739 0.813 0.308 1970 -1.494 0.097 -0.854 -0.189 0.927 1.275 -0.230 0.651 0.828 -0.125 -0.118 -0.636 1971 -0.403 0.142 -0.472 -0.363 0.746 -1.295 0.580 0.036 0.087 1.560 1.977 0.830 1972 -0.371 -0.223 0.056 0.533 0.588 0.840 1.037 0.995 -1.434 -0.444 0.200 0.436 1973 -0.267 0.814 0.542 -0.644 0.504 1.201 0.532 0.189 -0.183 -0.199 1.241 0.675 1974 0.694 0.178 -0.551 0.223 -0.387 -0.252 -0.375 -1.245 1.301 -1.817 -0.556 1.519 1975 1.286 -0.232 -0.448 0.148 -0.978 0.608 0.809 0.933 1.834 -0.184 0.450 0.975 1976 0.638 0.657 0.569 0.901 1.084 0.707 0.356 2.435 -2.174 -0.114 -0.234 -1.173 1977 -0.933 -0.436 -0.423 0.564 -0.880 0.084 0.282 -0.267 0.662 0.486 0.203 -0.525 1978 0.955 -1.240 0.653 -1.493 0.244 1.063 -1.053 0.648 0.781 0.793 0.284 -2.422 1979 -0.915 -0.542 -0.030 -1.345 0.909 1.020 0.368 -0.692 1.297 -0.166 0.203 0.549 1980 -1.175 0.049 -0.726 1.315 -1.666 -0.285 -0.865 -0.203 0.984 -0.186 -0.051 1.062 1981 0.739 0.333 -0.866 0.321 0.532 -0.048 0.532 1.773 -0.370 -0.460 0.699 -0.886 1982 -0.593 0.627 0.691 1.489 0.499 -1.775 1.608 -0.613 2.335 0.424 -0.578 1.241 1983 2.059 -1.145 0.973 -1.352 -0.099 1.352 2.097 2.316 0.394 1.376 0.255 0.324 1984 1.997 0.446 -0.757 1.094 0.461 0.264 0.254 1.457 -0.236 1.203 -1.732 0.596 1985 -1.576 -0.588 -0.165 0.073 -0.781 -0.587 -0.208 -1.964 0.785 1.137 -0.539 -0.626 1986 0.846 -1.800 1.419 -1.053 1.204 1.111 0.654 -0.690 -0.536 2.593 -0.705 0.747 1987 -1.413 -0.445 -0.023 1.028 -0.718 -1.588 0.919 0.604 1.355 0.078 0.373 -0.879 1988 0.829 -0.197 0.048 -0.029 0.055 1.934 -1.523 -1.221 0.467 -0.458 0.343 1.216 1989 1.327 1.991 1.383 -0.644 1.240 0.386 2.132 -0.501 1.038 0.878 -0.118 -1.087 1990 1.142 2.072 1.942 2.067 -1.436 -0.393 0.314 0.527 -0.001 0.290 0.093 0.868 1991 0.354 -0.130 -0.562 0.916 -0.352 -1.046 0.121 0.781 0.044 -0.698 0.138 1.032 1992 -0.353 1.186 1.082 0.620 1.592 1.063 0.411 -2.294 0.087 -2.157 -0.885 0.804 1993 1.984 -0.001 0.872 0.155 -1.012 -0.691 -1.254 0.486 -1.307 -1.907 -0.757 1.054 1994 1.129 -0.207 2.045 -0.224 -0.125 1.501 0.638 -0.217 -0.258 -0.033 -0.673 0.926 1995 1.134 1.423 1.037 -0.241 -0.916 0.612 0.179 2.215 -0.754 0.930 0.148 -1.273 1996 -1.402 -0.331 -1.250 -1.119 -0.459 0.588 1.337 0.314 -1.057 0.751 0.559 -1.348 1997 -0.878 2.054 1.092 0.920 -0.792 -1.427 0.594 0.380 0.167 -0.882 -1.558 -0.740 1998 -0.584 0.720 0.974 -2.206 -0.501 -1.627 -0.693 0.612 -1.579 0.642 -0.205 0.314 1999 0.659 0.357 -0.469 -0.492 0.444 1.020 0.345 -0.041 0.391 0.198 1.035 0.803 2000 0.153 1.594 0.468 -1.571 1.049 0.082 0.035 0.345 -0.063 0.892 -0.865 -1.561 2001 -0.313 -0.258 -1.107 0.048 -0.662 -0.710 0.254 -0.785 -1.591 0.115 1.912 -0.999 2002 0.297 1.281 0.281 0.793 -0.070 -0.554 0.181 1.075 -2.087 -1.010 -1.716 -1.220 2003 -0.003 0.240 0.257 -0.006 1.080 -0.976 -0.273 1.078 -0.015 -1.740 -0.994 0.346 2004 -0.262 -0.793 0.025 -0.397 -0.130 -0.794 -0.351 -0.603 0.406 -1.680 1.679 1.668 2005 0.534 -1.557 -1.733 -0.363 -0.486 -0.529 0.296 0.421 0.905 0.330 0.665 -0.179 2006 0.036 -1.106 -1.412 0.687 -0.201 1.513 0.883 1.007 -0.440 -1.109 -0.159 0.497 2007 0.757 -0.448 0.820 1.468 1.324 -1.668 -1.778 0.905 -0.100 0.988 1.785 0.581 2008 0.939 0.681 0.130 -1.607 -1.529 -1.184 -0.953 -1.083 -0.596 0.965 1.603 0.387 2009 0.190 -0.743 0.485 0.286 1.189 -0.839 -2.723 -1.227 0.787 -0.042 -1.347 -2.242 2010 -1.735 -1.965 -0.963 -0.080 -2.169 -0.220 -0.082 0.447 -1.272 -0.505 -0.213 -2.097 2011 -0.958 0.632 0.723 3.113 1.127 -1.375 -0.693 -0.915 1.251 1.185 -1.216 1.866 2012 0.564 -0.182 0.500 -1.040 -0.886 -2.562 -0.926 -0.819 0.495 -1.613 -0.225 -0.803 2013 -0.252 -0.917 -2.360 0.211 1.082 0.695 1.075 0.499 -0.426 -0.172 1.290 0.772 2014 0.149 0.608 0.798 0.647 0.041 -0.883 0.287 -1.076 -0.275 0.069 -1.189 1.346 2015 1.547 0.804 1.386 1.339 1.803 -0.183 -2.354 -1.093 -1.292 0.247 0.095 0.594 2016 0.048 0.696 -0.005 -1.882 -0.346 -0.669 -0.878 0.182 0.928 -0.851 0.999 0.516 2017 -0.199 -0.002 0.345 1.114 -1.886 -0.207 -0.002 -0.314 -0.773 0.145 0.983 0.386 2018 0.943 -0.106 -1.445 -0.273 2.036 1.157 1.406 0.155 1.167 0.923 -1.738 -0.318 2019 -0.135 0.085 1.394 -1.010 -2.041 -1.631 -0.996 -1.152 -0.399 -0.831 -0.607 -0.086 2020 1.183 2.017 0.875 0.044 -0.500 0.044 -0.343 -0.152 1.117 -1.370 0.270 -0.541 2021 -1.308 -0.453 0.350 -0.921 -0.209 1.004 0.316 0.980 -0.155 -0.171 1.566 -0.763 2022 0.539 1.564 0.060 -0.915 0.416 0.186 1.129 1.110 -2.625 0.042 -2.031 -1.616 2023 0.482 0.202 -1.020 -0.784 0.507 -0.104 -2.107 -0.032 0.365 -0.470 -0.697 0.259 2024 0.054 0.758 -0.802 -0.696 0.142 0.408 -0.002 -1.216 -1.846 0.228 0.542 1.036 2025 -0.343 -0.011 -0.140 -0.048 -0.181 0.730 0.817***********************************