ERA5 almanac comparison — 8 years of real data
Birmingham vs Martha's Vineyard: weather in August
Martha's Vineyard edges out Birmingham for sun in August: 46% clear historically versus 28% (8-year ERA5 average, a 18-point gap). Both are viable — Martha's Vineyard is the safer bet.
What you are reading: 8-year historical averages, not a forecast.
Either destination can still surprise you this specific August. For this
week’s actual forecast, each destination links to its live page below.
Birmingham
AL
- Clear days, August
- 28%
- Sample size
- n=248 days
- Avg high
- 88°F
- Early August (1st–15th)
- 22%
- Late August (16th–end)
- 34%
Martha's Vineyard
MA
- Clear days, August
- 46%
- Sample size
- n=248 days
- Avg high
- 77°F
- Early August (1st–15th)
- 48%
- Late August (16th–end)
- 45%
Compare Birmingham vs Martha's Vineyard 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.