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SunnyDays

ERA5 almanac comparison — 8 years of real data

Atlanta vs Costa Rica — Guanacaste: weather in November

Costa Rica — Guanacaste edges out Atlanta for sun in November: 18% clear historically versus 6% (8-year ERA5 average, a 12-point gap). Costa Rica — Guanacaste also sees measurably more rain than Atlanta this month (62% vs 28% of days). Both are viable — Costa Rica — Guanacaste is the safer bet.

What you are reading: 8-year historical averages, not a forecast. Either destination can still surprise you this specific November. For this week’s actual forecast, each destination links to its live page below.

Atlanta

GA

Clear days, November
6%
Sample size
n=240 days
Avg high
62°F
Early November (1st–15th)
11%
Late November (16th–end)
2%
Rain frequency
28% of days

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

Compare Atlanta 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.