ERA5 almanac comparison — 8 years of real data
Amelia Island vs St. Martin: weather in January
St. Martin edges out Amelia Island for sun in January: 18% clear historically versus 7% (8-year ERA5 average, a 11-point gap). St. Martin also sees measurably more rain than Amelia Island this month (44% vs 21% of days). Both are viable — St. Martin is the safer bet.
What you are reading: 8-year historical averages, not a forecast.
Either destination can still surprise you this specific January. For this
week’s actual forecast, each destination links to its live page below.
Amelia Island
FL
- Clear days, January
- 7%
- Sample size
- n=248 days
- Avg high
- 62°F
- Early January (1st–15th)
- 9%
- Late January (16th–end)
- 6%
- Rain frequency
- 21% of days
St. Martin
SX
- Clear days, January
- 18%
- Sample size
- n=248 days
- Avg high
- 75°F
- Early January (1st–15th)
- 18%
- Late January (16th–end)
- 18%
- Rain frequency
- 44% of days
Compare Amelia Island vs St. Martin 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.