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How often does El Nino typically appear?

User Uthark
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It occurs irregularly about every 2-7 years

User Jalpesh
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El NiƱos occur irregularly approximately every two to seven years. Warm water generally appears off the coast of South America close to Christmas, and reaches its peak warmth in the eastern Pacific during the late fall of the following year.
User Tomas Randus
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