Warm ENSO t-test, by season
1957-58, 63-64, 65-66, 68-69, 69-70, 72-73
based on Dec-Jan Nino3.4 being greater than 0.99C


Mar-May(0)
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Jun-Aug(0)
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Sep-Nov(0)
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Dec(0)-Feb(1)
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Mar-May(1)
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