ERA5 almanac comparison — 8 years of real data
Anguilla vs Costa Rica — Guanacaste: weather in January
Costa Rica — Guanacaste is the clear winner for sun in January: 79% of days historically clear versus just 17% in Anguilla — a 62-point gap across 8 years of ERA5 data. This isn't close.
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.
Anguilla
AI
- Clear days, January
- 17%
- Sample size
- n=248 days
- Avg high
- 79°F
- Early January (1st–15th)
- 14%
- Late January (16th–end)
- 20%
Costa Rica — Guanacaste
CR
- Clear days, January
- 79%
- Sample size
- n=248 days
- Avg high
- 91°F
- Early January (1st–15th)
- 72%
- Late January (16th–end)
- 85%
Compare Anguilla vs Costa Rica — Guanacaste 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.