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SunnyDays

ERA5 almanac comparison — 8 years of real data

Belize vs Hilton Head: weather in December

Essentially a tie in December: Belize is 10% clear historically, Hilton Head is 6% clear (8-year ERA5 average) — within the noise. Avg high 80°F vs 62°F. Belize also sees measurably more rain than Hilton Head this month (78% vs 27% of days). Pick based on flight time or price, not weather — the weather won't decide this one for you.

What you are reading: 8-year historical averages, not a forecast. Either destination can still surprise you this specific December. For the actual forecast right now, each destination links to its live page below.

Belize

Belize

Clear days, December
10%
Sample size
n=248 days
Avg high
80°F
Early December (1st–15th)
4%
Late December (16th–end)
15%
Rain frequency
78% 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
See the live forecast →

Frequently asked

Is Belize or Hilton Head warmer in December?

Belize runs warmer by day in December. Belize averages highs of 80°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 Belize or Hilton Head in December?

Belize is measurably wetter than Hilton Head. Days with measurable rain: Belize 78%, Hilton Head 27% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.

Which is sunnier in December, Belize or Hilton Head?

Essentially a tie in December: Belize is 10% clear historically, Hilton Head is 6% clear (8-year ERA5 average) — within the noise. Avg high 80°F vs 62°F. Belize also sees measurably more rain than Hilton Head this month (78% vs 27% of days). Pick based on flight time or price, not weather — the weather won't decide this one for you.

Compare Belize 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.