ERA5 almanac comparison — 8 years of real data
Key West vs Tucson: weather in January
Key West edges out Tucson for sun in January: 27% clear historically versus 13% (8-year ERA5 average, a 14-point gap). Both are viable — Key West is the safer bet.
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
Tucson
AZ
- Clear days, January
- 13%
- Sample size
- n=248 days
- Avg high
- 65°F
- Early January (1st–15th)
- 12%
- Late January (16th–end)
- 13%
- Rain frequency
- 14% of days
Frequently asked
Is Key West or Tucson warmer in January?
Key West runs warmer by day in January. Key West averages highs of 72°F (highs n=248 days); Tucson averages highs of 65°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Key West or Tucson in January?
Days with measurable rain: Key West 22%, Tucson 14% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in January, Key West or Tucson?
Key West edges out Tucson for sun in January: 27% clear historically versus 13% (8-year ERA5 average, a 14-point gap). Both are viable — Key West is the safer bet.
Compare Key West vs Tucson 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.