In physics terms, the El Nino is a time when the Earth dumps a huge amount of heat into space. You can't expect this to be a uniform process, especially when chaotic ocean currents are involved. And this was the strongest El Nino, and it just won't die.
I had expected to title this "Trumps leaves just as global warming ends", but the graph just doesn't show the expected plunge.
It's still way up there, in heat dumping mode. Boy, are we going to get a cold decade! So, we can expect a summer of the usual headlines. "Summer warmer than ever" (never mind the rate of increase). "We're all going to die" etc.