East Pacific Oscillation

Year January February March April May June July August September October November December
1948 1.863 0.197 1.206 -5.356 0.852 -4.266 1.404 -0.096 5.705 8.53 9.137 9.798
1949 -4.314 4.566 -8.024 7.273 -1.189 1.673 0.55 0.088 -1.726 -0.47 -1.846 0.534
1950 -12.841 10.16 3.994 4.209 5.212 -3.723 1.993 -1.423 0.24 4.632 -8.053 -2.977
1951 8.53 0.929 0.631 -3.582 -0.11 -4.014 -4.329 -3.283 -3.511 -0.252 0.508 0.152
1952 3.564 8.967 6.213 8.316 -0.202 1.771 -2.453 -2.038 -0.088 -5.653 -4.233 10.575
1953 7.987 10.697 8.845 0.932 1.817 -6.55 -0.363 1.176 3.464 3.669 6.356 9.149
1954 0.559 12.039 -9.251 1.121 -0.933 6.383 2.098 -5.353 -5.841 1.335 -0.603 7.251
1955 3.225 0.617 -2.601 6.547 8.862 1.396 -1.334 4.84 -0.404 10.607 -1.68 -0.324
1956 1.356 5.055 6.388 -2.26 1.421 4.701 -3.706 0.617 -4.323 6.852 -3.439 1.836
1957 -16.993 -6.255 -0.861 -4.242 -4.44 -0.858 4.589 -3.567 -4.738 -10.596 -2.827 12.626
1958 5.328 -5.047 -10.5 -1.606 -1.467 -7.214 -0.798 6.666 6.744 3.663 3.84 -2.204
1959 -1.516 -2.075 14.21 -0.755 -0.373 -0.518 5.722 2.469 4.771 -0.571 -3.921 8.815
1960 -1.648 0.116 1.803 6.08 2.237 2.038 1.279 4.283 0.801 2.259 2.804 -6.469
1961 -4.677 14.34 9.913 -0.572 -1.753 -0.361 -2.898 1.504 0.034 2.736 2.177 4.613
1962 -7.227 -11.195 -1.418 4.255 0.898 -2.974 -2.106 0.477 4.537 3.66 7.062 -8.059
1963 -21.746 -2.875 -3.383 -2.369 -3.051 3.659 0.321 -5.365 1.352 8.656 6.263 -4.941
1964 14.164 6.225 3.594 3.635 -1.293 -1.366 4.24 3.953 -0.916 -0.552 -2.241 4.816
1965 1.056 5.372 -18.11 -3.985 2.886 4.193 -3.527 -3.224 -10.621 6.497 -11.332 3.123
1966 -0.491 0.589 6.053 -10.142 4.4 1.459 -2.27 6.227 3.343 5.391 -9.245 1.48
1967 8.261 8.682 -7.163 -10.433 -2.678 -6.29 -1.039 0.951 7.28 6.719 -5.712 -3.532
1968 -4.187 -7.811 0.196 4.829 -4.649 3.946 -0.817 0.043 5.079 6.456 5.906 -0.827
1969 -5.415 7.924 -5.068 5.246 -2.349 -7.549 3.845 7.433 1.999 -9.283 -0.808 1.152
1970 -1.909 -6.226 -2.758 5.361 4.107 3.227 4.416 2.455 1.671 -1.496 -13.003 5.042
1971 2.028 8.43 9.789 8.113 5.016 -0.233 -4.192 2.426 0.787 1.64 1.084 -0.405
1972 2.083 4.994 2.275 7.327 -2.752 -0.951 -5.486 -0.523 -3.379 -8.293 -1.166 -5.572
1973 5.024 -5.048 9.391 -0.336 7.378 5.385 2.629 1.644 2.29 5.425 -4.435 6.19
1974 -5.262 13.396 0.024 3.985 3.203 2.898 2.839 -7.271 -9.034 1.508 2.278 11.543
1975 8.079 4.715 2.979 -1.045 3.576 0.868 -0.83 1.933 -4.754 4.469 7.01 4.954
1976 3.301 8.865 4.629 1.151 6.305 -3.367 4.515 0.275 2.39 -1.256 -6.986 -1.882
1977 -9.726 6.222 6.685 -1.258 4.289 -0.394 1.651 -4.102 -3.016 5.909 5.845 -3.823
1978 -11.31 -1.699 -2.546 -2.905 3.474 -4.477 -2.542 -0.122 4.1 0.703 -10.206 -1.377
1979 -10.658 4.829 -7.709 -9.25 4.034 -2.719 -2.651 -5.858 0.413 -0.44 -9.121 4.575
1980 -3.884 -5.614 2.58 7.774 1.622 -8.335 0.449 -0.052 0.71 -1.074 2.717 -5.974
1981 -8.134 -1.581 -1.038 2.728 -2.467 8.805 -0.786 1.56 6.821 -3.618 2.971 6.618
1982 1.759 -4.528 -3.631 2.658 2.119 -4.346 -0.294 -1.332 -1.997 1.599 -1.551 2.848
1983 4.887 3.057 -0.822 -6.696 -0.038 3.198 5.358 3.695 2.345 1.246 3.645 -12.362
1984 0.221 14.377 -0.946 7.422 8.077 3.205 0.572 -0.355 -1.293 0.349 6.146 -4.657
1985 -11.563 7.392 5.17 8.009 -0.257 2.17 -3.141 -2.131 -5.923 5.14 -13.097 -12.05
1986 5.189 -4.393 2.191 5.619 5.304 1.063 -1.677 0.494 -8.295 -9.953 -1.824 0.203
1987 3.92 -1.624 -5.346 7.052 1.619 2.82 -1.909 -6.059 1.752 -4.982 1.949 5.221
1988 -0.444 0.623 3.483 3.647 5.017 2.153 4.38 0.632 3.469 -2.749 11.474 -0.372
1989 13.393 -23.214 -3.13 -9.713 -4.169 -3.331 -2.469 -4.412 -7.148 -3.037 3.22 -9.616
1990 9.747 6.068 -7.379 -9.718 -3.768 -0.298 -1.542 -1.348 -1.598 7.183 3.222 -5.48
1991 -8.794 0.716 -3.169 1.54 1.73 -2.765 2.603 3.406 -2.584 -8.471 0.2 5.949
1992 3.368 -4.64 -4.547 -2.268 -4.283 -3.423 -3.446 -0.007 5.563 1.315 -2.241 -0.724
1993 -6.382 -11.541 -1.998 1.298 -6.393 0.122 -3.497 -2.783 -8.595 -10.79 -8.387 1.635
1994 -6.663 0.23 1.012 -1.38 4.985 0.118 -2.606 -8.715 1.956 3.609 6.829 6.23
1995 -3.598 -8.48 -3.997 -4.557 -4.569 -0.719 -0.4 4.303 -4.361 3.778 -2.768 1.424
1996 -0.658 -1.958 -17.142 5.916 -2.31 1.492 -1.232 3.188 3.454 3.936 -8.214 -0.916
1997 -2.82 1.944 4.078 -2.299 -10.064 1.665 1.958 -3.613 1.55 2.05 -3.43 5.598
1998 2.265 8.932 -3.694 0.253 -1.921 -4.997 0.985 4.286 2.415 0.55 2.329 1.9
1999 5.843 19.206 8.144 0.815 4.027 0.352 -2.257 1.061 1.833 5.443 5.133 5.366
2000 4.5 3.362 5.797 0.52 6.493 -0.176 -0.581 -2.306 -1.731 1.559 -6.005 -5.584
2001 3.647 -4.188 3.413 2.439 9.719 -3.218 -0.115 3.318 3.712 4.749 2.894 7.625
2002 1.043 7.276 -8.278 -6.971 -3.651 1.801 2.047 1.182 -0.348 -11.547 -7.541 1.714
2003 -6.833 -8.271 2.053 -3.314 2.771 -0.768 -1.253 1.541 1.802 -3.217 -4.225 7.417
2004 -4.326 3.724 4.997 -4.986 -5.92 -8.426 -3.724 -3.717 5.062 -0.154 -1.089 -2.607
2005 -12.886 -3.027 -4.583 -4.622 -1.939 -1.628 6.651 -1.446 1.395 7.909 1.959 -3.982
2006 12.909 -2.991 -0.761 4.888 -1.361 -1.66 2.252 1.547 -2.735 -6.975 2.906 10.638
2007 2.052 -0.238 8.916 5.057 2.183 0.791 2.355 -0.272 -0.153 8.809 -2.629 5.33
2008 3.901 8.751 7.903 -2.222 -0.78 1.429 5.098 7.572 -0.565 5.012 1.881 -3.372
2009 -1.496 -2.477 4.056 -5.323 -2.823 -0.53 -4.681 1.848 6.069 -5.227 10.417 -14.201
2010 -4.048 -2.642 9.248 4.203 2.667 5.101 1.352 -1.135 -1.87 6.487 -4.178 0.205
2011 -4.373 -1.66 5.665 6.672 -0.751 1.248 4.433 5.599 8.206 5.578 7.391 2.557
2012 13.572 4.677 13.469 -1.068 7.834 -0.014 0.282 -1.233 0.472 -8.216 -4.3 5.583
2013 -4.712 7.026 -4.3 -1.954 -2.404 -5.844 -5.886 0.709 3.878 -9.208 -9.056 -8.732
2014 -8.59 0.652 -1.863 2.706 -7.868 0.564 0.196 2.403 -2.023 2.901 -9.952 -2.77
2015 -9.206 -10.362 -3.927 4.095 -12.828 -3.991 0.729 -0.603 3.449 -3.366 -0.404 9.746
2016 -1.808 4.146 -0.231 -1.953 -7.091 -1.8 -1.058 -3.823 1.296 -4.723 4.433

The monthly East Pacific Oscillation (EPO) is a monthly average from daily average from Daily Teleconnection Indices: Historical Values from NCAR/NCEP Reanalysis-EPO. The original monthly average is divided by 10.

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