Warm ENSO anomalies with respect to neutral conditions, by season
1982-83, 86-87, 91-92, 97-98, 2002-2003
based on Dec-Jan Nino3.4 being greater than 0.99C
Mar-May(0)
Jun-Aug(0)
Sep-Nov(0)
Dec(0)-Feb(1)
Mar-May(1)