ERA5 almanac comparison — 8 years of real data
Door County vs San Juan Islands: weather in July
Door County edges out San Juan Islands for sun in July: 40% clear historically versus 26% (8-year ERA5 average, a 14-point gap). Both are viable — Door County is the safer bet.
What you are reading: 8-year historical averages, not a forecast.
Either destination can still surprise you this specific July. For this
week’s actual forecast, each destination links to its live page below.
Door County
WI
- Clear days, July
- 40%
- Sample size
- n=248 days
- Avg high
- 77°F
- Early July (1st–15th)
- 45%
- Late July (16th–end)
- 36%
San Juan Islands
WA
- Clear days, July
- 26%
- Sample size
- n=248 days
- Avg high
- 70°F
- Early July (1st–15th)
- 22%
- Late July (16th–end)
- 29%
Compare Door County vs San Juan Islands 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.