 On average , Florida has some of the mildest winters in the United States . Average lows range from 65 ° F ( 18 ° C ) in Key West to near 41 ° F ( 5 ° C ) degrees Fahrenheit at Tallahassee , whereas daytime highs range from 64 ° F ( 18 ° C ) at Tallahassee to 77 ° F ( 25 ° C ) at Miami . Predominant easterly winds across southern Florida keep temperatures moderate during the winter , as the nearby Gulf Stream modifies cooler air moving in from the northeast . The Gulf Stream is of little effect , however , when strong cold fronts move southward down the peninsula and freezing temperatures are not unusual in the inland areas of South Florida with even Miami experiencing occasional temperatures in the thirties ( F ) . El Niño winters tend to be cooler due to increased cloud cover , but tend to have fewer freezes . 
