ERA5 almanac comparison — 8 years of real data

Antigua vs Belize: weather in January

Essentially a tie in January: Antigua is 14% clear historically, Belize is 14% clear (8-year ERA5 average) — within the noise. Avg high 80°F vs 80°F. Belize also sees measurably more rain than Antigua this month (69% vs 51% 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 January. For this week’s actual forecast, each destination links to its live page below.

Antigua

Clear days, January: 14%
Sample size: n=248 days
Avg high: 80°F
Early January (1st–15th): 15%
Late January (16th–end): 13%
Rain frequency: 51% of days

Belize

Clear days, January: 14%
Sample size: n=248 days
Avg high: 80°F
Early January (1st–15th): 12%
Late January (16th–end): 16%
Rain frequency: 69% of days

Compare Antigua vs Belize 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.