There’s an irregular cycle of weather patterns in the Pacific Ocean that takes several years to change. The two states it oscillates between are called The Girl and The Boy – La Niña and El Niño.
As an oversimplified overview of the effects, La Niña tends to reinforce the patterns that are already there, dry regions become even dryer, wet regions become even wetter. El Niño partially counteracts this pattern, leading to seemingly unusual weather like a moderate and wet Summer where you would expect a hot and dry one.
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