Yes, 1964-65 showed a weak La Nino, indeed. And the El Nino in 1965-66 was a fairly strong one. I don't know what the NAO was doing in 1965, though. What I do know is that the PDO (Pacific Decadal Oscillation) was mainly negative during the middle 1960s, while it has been positive for at least the last 2 years. That may further encourage El Nino development later this year, along with the residual positive SST anomalies from the strong 2015-16 El Nino just outside of the tropics in the Pacific. But analogs are known not to work very well, due to the lack of excellent analogs in the relatively short historical record. So we will need to wait and see what develops, and the "spring barrier" creates considerable uncertainty right now.