ERA5 almanac comparison — 8 years of real data
Costa Rica — Guanacaste vs Savannah: weather in November
Essentially a tie in November: Costa Rica — Guanacaste is 18% clear historically, Savannah is 18% clear (8-year ERA5 average) — within the noise. Avg high 86°F vs 70°F. Costa Rica — Guanacaste also sees measurably more rain than Savannah this month (62% vs 30% of days). Pick based on flight time or price, not weather — the weather won't decide this one for you.
Costa Rica — Guanacaste
CR
- Clear days, November
- 18%
- Sample size
- n=240 days
- Avg high
- 86°F
- Early November (1st–15th)
- 10%
- Late November (16th–end)
- 25%
- Rain frequency
- 62% of days
Savannah
GA
- Clear days, November
- 18%
- Sample size
- n=240 days
- Avg high
- 70°F
- Early November (1st–15th)
- 23%
- Late November (16th–end)
- 14%
- Rain frequency
- 30% of days
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 7-day outlook for any destination is on its own page and may differ from the long-run average. Data from Open-Meteo.