ERA5 almanac comparison — 8 years of real data
Martha's Vineyard vs Savannah: weather in July
Martha's Vineyard is the clear winner for sun in July: 45% of days historically clear versus just 14% in Savannah — a 31-point gap across 8 years of ERA5 data. Savannah also sees measurably more rain than Martha's Vineyard this month (63% vs 33% of days). This isn't close.
Martha's Vineyard
MA
- Clear days, July
- 45%
- Sample size
- n=248 days
- Avg high
- 78°F
- Early July (1st–15th)
- 47%
- Late July (16th–end)
- 44%
- Rain frequency
- 33% of days
Savannah
GA
- Clear days, July
- 14%
- Sample size
- n=248 days
- Avg high
- 90°F
- Early July (1st–15th)
- 13%
- Late July (16th–end)
- 14%
- Rain frequency
- 63% of days
Frequently asked
Is Martha's Vineyard or Savannah warmer in July?
Savannah runs warmer by day in July. Martha's Vineyard averages highs of 78°F (highs n=248 days); Savannah averages highs of 90°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Martha's Vineyard or Savannah in July?
Savannah is measurably wetter than Martha's Vineyard. Days with measurable rain: Martha's Vineyard 33%, Savannah 63% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in July, Martha's Vineyard or Savannah?
Martha's Vineyard is the clear winner for sun in July: 45% of days historically clear versus just 14% in Savannah — a 31-point gap across 8 years of ERA5 data. Savannah also sees measurably more rain than Martha's Vineyard this month (63% vs 33% of days). This isn't close.
Compare Martha's Vineyard 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 forecast for any destination is on its own page and may differ from the long-run average. Data from Open-Meteo.