ERA5 almanac comparison — 8 years of real data
Costa Rica — Guanacaste vs Savannah: weather in January
Costa Rica — Guanacaste is the clear winner for sun in January: 79% of days historically clear versus just 2% in Savannah — a 77-point gap across 8 years of ERA5 data. Savannah also sees measurably more rain than Costa Rica — Guanacaste this month (28% vs 6% of days). This isn't close.
Costa Rica — Guanacaste
Costa Rica
- Clear days, January
- 79%
- Sample size
- n=248 days
- Avg high
- 91°F
- Early January (1st–15th)
- 72%
- Late January (16th–end)
- 85%
- Rain frequency
- 6% of days
Savannah
GA
- Clear days, January
- 2%
- Sample size
- n=248 days
- Avg high
- 60°F
- Early January (1st–15th)
- 3%
- Late January (16th–end)
- 2%
- Rain frequency
- 28% of days
Frequently asked
Is Costa Rica — Guanacaste or Savannah warmer in January?
Costa Rica — Guanacaste runs warmer by day in January. Costa Rica — Guanacaste averages highs of 91°F (highs n=248 days); Savannah averages highs of 60°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Costa Rica — Guanacaste or Savannah in January?
Savannah is measurably wetter than Costa Rica — Guanacaste. Days with measurable rain: Costa Rica — Guanacaste 6%, Savannah 28% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in January, Costa Rica — Guanacaste or Savannah?
Costa Rica — Guanacaste is the clear winner for sun in January: 79% of days historically clear versus just 2% in Savannah — a 77-point gap across 8 years of ERA5 data. Savannah also sees measurably more rain than Costa Rica — Guanacaste this month (28% vs 6% of days). This isn't close.
Compare Costa Rica — Guanacaste vs Savannah 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.