ERA5 almanac comparison — 8 years of real data
30A / Seaside vs Kiawah Island: weather in December
Essentially a tie in December: 30A / Seaside is 4% clear historically, Kiawah Island is 4% clear (8-year ERA5 average) — within the noise. Avg high 65°F vs 62°F. Pick based on flight time or price, not weather — the weather won't decide this one for you.
30A / Seaside
FL
- Clear days, December
- 4%
- Sample size
- n=248 days
- Avg high
- 65°F
- Early December (1st–15th)
- 2%
- Late December (16th–end)
- 6%
- Rain frequency
- 33% of days
Kiawah Island
SC
- Clear days, December
- 4%
- Sample size
- n=248 days
- Avg high
- 62°F
- Early December (1st–15th)
- 2%
- Late December (16th–end)
- 5%
- Rain frequency
- 29% of days
Frequently asked
Is 30A / Seaside or Kiawah Island warmer in December?
30A / Seaside runs warmer by day in December. 30A / Seaside averages highs of 65°F (highs n=248 days); Kiawah Island averages highs of 62°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in 30A / Seaside or Kiawah Island in December?
Days with measurable rain: 30A / Seaside 33%, Kiawah Island 29% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in December, 30A / Seaside or Kiawah Island?
Essentially a tie in December: 30A / Seaside is 4% clear historically, Kiawah Island is 4% clear (8-year ERA5 average) — within the noise. Avg high 65°F vs 62°F. Pick based on flight time or price, not weather — the weather won't decide this one for you.
Compare 30A / Seaside vs Kiawah Island 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.