A Pacific storm and atmospheric river will impact the Pacific Northwest states and northern Rockies this weekend, bringing locally heavy low elevations rain and heavy high elevation snow in the mountains. By Sunday over the Interior Northwest, rain combined with snowmelt will increase the risk of flood hazards. Flood Watches are in effect. Read More >
 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 Centers for Environmental Information.
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 to the east and south, and the tempering effects of the Gulf to the west, 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 just shy of 25 percent of the annual rainfall, usually ahead of cold fronts. June through October is considered the wet season, receiving approximately 65 percent of the yearly total in showers and thunderstorms. May and November are typically seen as transition months between seasons. Easterly waves during this season occasionally bring excessive rainfall, while infrequent hurricanes may be accompanied by unusually heavy amounts.
Normal Temperature & Precipitation Data
Record Temperature & Precipitation Tables KEY WEST MARATHON TAVERNIER
Top 5 Rankings in Past 30 Years
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