National Weather Service United States Department of Commerce

Note: Observation, Forecast, and Warning data are generally available upon request via your local weather office. However, data obtained through a Weather Forecast Office is UNOFFICIAL data and generally not acceptable for legal use. The data posted on this Florida Keys Climatology website is unofficial station data. For official climate records, please visit the National Climatic Data Center.


The Florida Keys are a chain of islands that swing in a southwesterly arc from the southeast coast of the Florida peninsula, with the island of Key West being located near the western end this chain. Due to the nearness of the Gulf Stream in the Straits of Florida, and the tempering effects of the Gulf of Mexico, the Florida Keys have a notably mild, tropical-maritime climate.
Diurnal temperature variations throughout the year range about 10 degrees. Winter cold fronts tend to be modified by the warm water as they move in from the north, keeping monthly average temperatures typically only 15 degrees lower in the winter than during the summer. There is still no record of frost, ice, sleet, or snow in Key West, but ice has been reported in the Upper Keys.

December through April, referred to as the dry season, receives roughly 25 percent of the annual rainfall, usually ahead of cold fronts. June through October is considered the wet season, receiving approximately 60 percent of the yearly total in showers and thunderstorms. Easterly waves during this season occasionally bring excessive rainfall, while infrequent hurricanes may be accompanied by unusually heavy amounts.


Record Temperature & Precipitation Tables
( PDF Format )

1871/1872 - Present

1950/1951 - Present

1948/1949 - 2009


Top 5 Rankings in Past 30 Years
( Key West Only, 1981-2010 - PDF Format )

Top 10 Rankings On Record
( Key West Only, 1871-Present - PDF Format )

Additional Local Climate Links
What are Heating / Cooling Degree Days?
Wind Frequency Plots for Key West