ERA5 almanac comparison — 8 years of real data
Aruba vs Savannah: weather in December
Essentially a tie in December: Aruba is 12% clear historically, Savannah is 8% clear (8-year ERA5 average) — within the noise. Avg high 84°F vs 63°F. Aruba also sees measurably more rain than Savannah this month (55% vs 27% of days). Pick based on flight time or price, not weather — the weather won't decide this one for you.
Aruba
AW
- Clear days, December
- 12%
- Sample size
- n=248 days
- Avg high
- 84°F
- Early December (1st–15th)
- 13%
- Late December (16th–end)
- 12%
- Rain frequency
- 55% 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 Aruba 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.