Climate in Marathon
Marathon shares the Florida Keys' distinct tropical climate -- the only tropical climate zone in the continental United States -- and has its own well-documented, relatively recent experience of just how serious hurricane season here can be.
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Learn moreA genuinely different climate classification than mainland Florida
Unlike peninsular Florida's humid subtropical climate, the Florida Keys -- warmed by the nearby Gulf Stream -- sit in a tropical, tropical-maritime climate zone, the only place in the continental U.S. with that classification. In practice, this means milder winter temperature swings and a longer, more consistent warm season than mainland Florida communities experience, alongside the same hurricane-season exposure that applies statewide.
Hurricane Irma (2017) struck the Middle Keys directly
Hurricane Irma made landfall in the Florida Keys in September 2017 as a major hurricane, and the Middle Keys -- including Marathon -- experienced severe wind and storm-surge damage; this is a well-documented, relatively recent event rather than a historical footnote, and it directly informs how seriously Monroe County treats hurricane preparedness and insurance pricing in Marathon today (see taxes-insurance).
Specific temperature and rainfall normals were not independently sourced this session
General Keys climate is warm and humid nearly year-round with limited winter cooling, but a specific, current temperature or rainfall normal for Marathon was not independently verified this session -- confirm current NOAA climate-normal data for the Middle Keys before relying on a precise figure.
Key takeaways
- The Florida Keys, including Marathon, sit in the only tropical climate zone in the continental United States -- distinct from the humid subtropical climate covering the rest of peninsular Florida.
- Winters run milder here than mainland Florida, with a longer, more consistent warm season, thanks to the moderating Gulf Stream.
- Hurricane Irma (September 2017) struck the Middle Keys, including Marathon, directly and severely -- a real, recent, well-documented reminder of the region's storm exposure.
- A specific, current temperature/rainfall normal for Marathon wasn't independently sourced this session -- confirm with NOAA climate-normal data directly.
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