ERA5 almanac comparison — 8 years of real data
Atlanta vs Hilton Head: weather in December
Hilton Head edges out Atlanta for sun in December: 6% clear historically versus 1% (8-year ERA5 average, a 5-point gap). Both are viable — Hilton Head is the safer bet.
Atlanta
GA
- Clear days, December
- 1%
- Sample size
- n=248 days
- Avg high
- 56°F
- Early December (1st–15th)
- 1%
- Late December (16th–end)
- 1%
- Rain frequency
- 35% of days
Hilton Head
SC
- Clear days, December
- 6%
- Sample size
- n=248 days
- Avg high
- 62°F
- Early December (1st–15th)
- 3%
- Late December (16th–end)
- 8%
- Rain frequency
- 27% of days
Frequently asked
Is Atlanta or Hilton Head warmer in December?
Hilton Head runs warmer by day in December. Atlanta averages highs of 56°F (highs n=248 days); Hilton Head averages highs of 62°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Atlanta or Hilton Head in December?
Days with measurable rain: Atlanta 35%, Hilton Head 27% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in December, Atlanta or Hilton Head?
Hilton Head edges out Atlanta for sun in December: 6% clear historically versus 1% (8-year ERA5 average, a 5-point gap). Both are viable — Hilton Head is the safer bet.
Compare Atlanta vs Hilton Head 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.