ERA5 almanac comparison — 8 years of real data
Key West vs Miami: weather in January
Essentially a tie in January: Key West is 27% clear historically, Miami is 28% clear (8-year ERA5 average) — within the noise. Avg high 72°F vs 75°F. Pick based on flight time or price, not weather — the weather won't decide this one for you.
Key West
FL
- Clear days, January
- 27%
- Sample size
- n=248 days
- Avg high
- 72°F
- Early January (1st–15th)
- 32%
- Late January (16th–end)
- 23%
- Rain frequency
- 22% of days
Miami
FL
- Clear days, January
- 28%
- Sample size
- n=248 days
- Avg high
- 75°F
- Early January (1st–15th)
- 30%
- Late January (16th–end)
- 26%
- Rain frequency
- 33% of days
Frequently asked
Is Key West or Miami warmer in January?
Miami runs warmer by day in January. Key West averages highs of 72°F (highs n=248 days); Miami averages highs of 75°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Key West or Miami in January?
Days with measurable rain: Key West 22%, Miami 33% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in January, Key West or Miami?
Essentially a tie in January: Key West is 27% clear historically, Miami is 28% clear (8-year ERA5 average) — within the noise. Avg high 72°F vs 75°F. Pick based on flight time or price, not weather — the weather won't decide this one for you.
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.