ERA5 almanac comparison — 8 years of real data
Birmingham vs Nantucket: weather in October
Birmingham is the clear winner for sun in October: 44% of days historically clear versus just 0% in Nantucket — a 44-point gap across 8 years of ERA5 data. This isn't close.
What you are reading: 8-year historical averages, not a forecast.
Either destination can still surprise you this specific October. For this
week’s actual forecast, each destination links to its live page below.
Birmingham
AL
- Clear days, October
- 44%
- Sample size
- n=248 days
- Avg high
- 75°F
- Early October (1st–15th)
- 53%
- Late October (16th–end)
- 36%
Nantucket
MA
- Clear days, October
- 0%
- Sample size
- n=248 days
- Avg high
- 62°F
- Early October (1st–15th)
- 0%
- Late October (16th–end)
- 0%
Compare Birmingham vs Nantucket 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.