ERA5 almanac comparison — 8 years of real data
Atlanta vs Key West: weather in March
Key West is the clear winner for sun in March: 45% of days historically clear versus just 11% in Atlanta — a 34-point gap across 8 years of ERA5 data. Atlanta also sees measurably more rain than Key West this month (35% vs 16% of days). This isn't close.
What you are reading: 8-year historical averages, not a forecast.
Either destination can still surprise you this specific March. For this
week’s actual forecast, each destination links to its live page below.
Atlanta
GA
- Clear days, March
- 11%
- Sample size
- n=248 days
- Avg high
- 65°F
- Early March (1st–15th)
- 8%
- Late March (16th–end)
- 13%
- Rain frequency
- 35% of days
Key West
FL
- Clear days, March
- 45%
- Sample size
- n=248 days
- Avg high
- 76°F
- Early March (1st–15th)
- 43%
- Late March (16th–end)
- 47%
- Rain frequency
- 16% of days
Compare Atlanta vs Key West 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.