ERA5 almanac comparison — 8 years of real data
Key West vs Savannah: weather in December
Key West is the clear winner for sun in December: 41% of days historically clear versus just 8% in Savannah — a 33-point gap across 8 years of ERA5 data. This isn't close.
What you are reading: 8-year historical averages, not a forecast.
Either destination can still surprise you this specific December. For this
week’s actual forecast, each destination links to its live page below.
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
Savannah
GA
- Clear days, December
- 8%
- Sample size
- n=248 days
- Avg high
- 63°F
- Early December (1st–15th)
- 7%
- Late December (16th–end)
- 9%
- Rain frequency
- 27% of days
Compare Key West vs Savannah 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 7-day outlook for any destination is on its own page and may differ from the long-run average. Data from Open-Meteo.