The effects of an El Nino event in south Florida are most pronounced during the dry season. Above average rainfall and below average temperatures are typically expected. While the temperatures are generally cooler (due to increased cloud cover) there are also fewer freezes. It should also be noted that while a high correlation does exist between El Nino and winter weather in south Florida, an exact correlation does not exist. There have been dry and warm El Nino winters.

As shown in the graph below, the increase in rainfall is greatest between November and March. Looking at the 6 strongest El Nino events since 1950, this period averages about 150% of the amount typically expected. However, there is rather large variability as rainfall has ranged between 85% and 213% during these 6 events.

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