ERA5 almanac comparison — 8 years of real data
Key West vs Miami: weather in December
Key West edges out Miami for sun in December: 41% clear historically versus 28% (8-year ERA5 average, a 13-point gap). Miami also sees measurably more rain than Key West this month (41% vs 26% of days). Both are viable — Key West is the safer bet.
Key West
FL
- Clear days, December
- 41%
- Sample size
- n=248 days
- Avg high
- 75°F
- Early December (1st–15th)
- 48%
- Late December (16th–end)
- 35%
- Rain frequency
- 26% of days
Miami
FL
- Clear days, December
- 28%
- Sample size
- n=248 days
- Avg high
- 77°F
- Early December (1st–15th)
- 35%
- Late December (16th–end)
- 21%
- Rain frequency
- 41% of days
Frequently asked
Is Key West or Miami warmer in December?
Miami runs warmer by day in December. Key West averages highs of 75°F (highs n=248 days); Miami averages highs of 77°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Key West or Miami in December?
Miami is measurably wetter than Key West. Days with measurable rain: Key West 26%, Miami 41% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in December, Key West or Miami?
Key West edges out Miami for sun in December: 41% clear historically versus 28% (8-year ERA5 average, a 13-point gap). Miami also sees measurably more rain than Key West this month (41% vs 26% of days). Both are viable — Key West is the safer bet.
Compare Key West vs Miami in another month
All percentages are historical averages from the ERA5 reanalysis via Open-Meteo, 8 full years (2018–2025). “Clear” means avg high ≥ 72 °F, precipitation < 1 mm, and a non-precipitation weather code. This is history, not a forecast. The live forecast for any destination is on its own page and may differ from the long-run average. Data from Open-Meteo.