ERA5 almanac comparison — 8 years of real data
Martha's Vineyard vs San Antonio: weather in July
Essentially a tie in July: Martha's Vineyard is 45% clear historically, San Antonio is 44% clear (8-year ERA5 average) — within the noise. Avg high 78°F vs 95°F. Pick based on flight time or price, not weather — the weather won't decide this one for you.
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
San Antonio
TX
- Clear days, July
- 44%
- Sample size
- n=248 days
- Avg high
- 95°F
- Early July (1st–15th)
- 38%
- Late July (16th–end)
- 50%
- Rain frequency
- 29% of days
Frequently asked
Is Martha's Vineyard or San Antonio warmer in July?
San Antonio runs warmer by day in July. Martha's Vineyard averages highs of 78°F (highs n=248 days); San Antonio averages highs of 95°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Martha's Vineyard or San Antonio in July?
Days with measurable rain: Martha's Vineyard 33%, San Antonio 29% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in July, Martha's Vineyard or San Antonio?
Essentially a tie in July: Martha's Vineyard is 45% clear historically, San Antonio is 44% clear (8-year ERA5 average) — within the noise. Avg high 78°F vs 95°F. Pick based on flight time or price, not weather — the weather won't decide this one for you.
Compare Martha's Vineyard vs San Antonio 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.