Temperature for December
In Key West, FL during December the average high temperature is 77.5°F. The hottest day on record was December 7, 1978 when the temperature hit 86.0°F.
Precipitation for December
In December the average monthly rainfall in Key West, FL is 3.18 inches with rain usually falling on between 7 and 8 days. 2005 was the driest December with only 0.05 inches of rain falling, and 1973 was the wettest December with 22.74 inches of rain. The wettest single day in December was 30 December 1973 when 18.03 inches of rain fell.
In December it usually snows on between 0 and 1 days. Tornados are reported on 0 and 1 days in December. In December there have been some years when thunderstorms have occurred, although there are other years when there hasn't been a thunderstorm in December.