ERA5 almanac comparison — 8 years of real data
Costa Rica — Guanacaste vs Savannah: weather in March
Costa Rica — Guanacaste is the clear winner for sun in March: 70% of days historically clear versus just 25% in Savannah — a 45-point gap across 8 years of ERA5 data. Savannah also sees measurably more rain than Costa Rica — Guanacaste this month (30% vs 10% of days). This isn't close.
Costa Rica — Guanacaste
Costa Rica
- Clear days, March
- 70%
- Sample size
- n=248 days
- Avg high
- 96°F
- Early March (1st–15th)
- 77%
- Late March (16th–end)
- 63%
- Rain frequency
- 10% of days
Savannah
GA
- Clear days, March
- 25%
- Sample size
- n=248 days
- Avg high
- 72°F
- Early March (1st–15th)
- 19%
- Late March (16th–end)
- 30%
- Rain frequency
- 30% of days
Frequently asked
Is Costa Rica — Guanacaste or Savannah warmer in March?
Costa Rica — Guanacaste runs warmer by day in March. Costa Rica — Guanacaste averages highs of 96°F (highs n=248 days); Savannah averages highs of 72°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Costa Rica — Guanacaste or Savannah in March?
Savannah is measurably wetter than Costa Rica — Guanacaste. Days with measurable rain: Costa Rica — Guanacaste 10%, Savannah 30% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in March, Costa Rica — Guanacaste or Savannah?
Costa Rica — Guanacaste is the clear winner for sun in March: 70% of days historically clear versus just 25% in Savannah — a 45-point gap across 8 years of ERA5 data. Savannah also sees measurably more rain than Costa Rica — Guanacaste this month (30% vs 10% 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.