ERA5 almanac comparison — 8 years of real data
Key West vs Tucson: weather in October
Tucson is the clear winner for sun in October: 82% of days historically clear versus just 13% in Key West — a 69-point gap across 8 years of ERA5 data. Key West also sees measurably more rain than Tucson this month (52% vs 9% of days). This isn't close.
Key West
FL
- Clear days, October
- 13%
- Sample size
- n=248 days
- Avg high
- 82°F
- Early October (1st–15th)
- 8%
- Late October (16th–end)
- 18%
- Rain frequency
- 52% of days
Tucson
AZ
- Clear days, October
- 82%
- Sample size
- n=248 days
- Avg high
- 86°F
- Early October (1st–15th)
- 78%
- Late October (16th–end)
- 85%
- Rain frequency
- 9% of days
Frequently asked
Is Key West or Tucson warmer in October?
Tucson runs warmer by day in October. Key West averages highs of 82°F (highs n=248 days); Tucson averages highs of 86°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Key West or Tucson in October?
Key West is measurably wetter than Tucson. Days with measurable rain: Key West 52%, Tucson 9% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in October, Key West or Tucson?
Tucson is the clear winner for sun in October: 82% of days historically clear versus just 13% in Key West — a 69-point gap across 8 years of ERA5 data. Key West also sees measurably more rain than Tucson this month (52% vs 9% of days). This isn't close.
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.