"Usually, the increase occurs more toward the latter part of the El Niño, when there is a mini-global warming," said Kevin Trenberth, a climate scientist at the National Center for Atmospheric Research in Boulder, Colorado.
However, the record-setting temperature record may not occur until 2015. The fever from El Niño tends to lag a few months behind the start of the associated climate event, so the heat may not hit next year. During the 1997 El Niño, the Pacific Ocean heating kicked off in May 1997, but global temperatures peaked in 1998, at four times above average.
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