The report shows that La Nina occurs about twice per decade, or about 20% of the time and can last from 6 months to a couple of years. There is El Nino, the Pacific Dodecadal pattern and other major global atmospheric circulations fueled by ocean currents that regularly cycle back and forth as dominant. The idea that averages or normal mean anything is false and misleading, giving the impression that average and normal are what happens most of time.
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