ERA5 almanac comparison — 8 years of real data
Dallas vs San Juan Islands: weather in June
Dallas edges out San Juan Islands for sun in June: 38% clear historically versus 10% (8-year ERA5 average, a 28-point gap). Both are viable — Dallas is the safer bet.
What you are reading: 8-year historical averages, not a forecast.
Either destination can still surprise you this specific June. For this
week’s actual forecast, each destination links to its live page below.
Dallas
TX
- Clear days, June
- 38%
- Sample size
- n=240 days
- Avg high
- 91°F
- Early June (1st–15th)
- 36%
- Late June (16th–end)
- 39%
- Rain frequency
- 40% of days
San Juan Islands
WA
- Clear days, June
- 10%
- Sample size
- n=240 days
- Avg high
- 64°F
- Early June (1st–15th)
- 7%
- Late June (16th–end)
- 13%
Compare Dallas 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.