ERA5 almanac comparison — 8 years of real data
Park City vs Steamboat Springs: weather in September
Steamboat Springs edges out Park City for sun in September: 52% clear historically versus 30% (8-year ERA5 average, a 22-point gap). Both are viable — Steamboat Springs is the safer bet.
What you are reading: 8-year historical averages, not a forecast.
Either destination can still surprise you this specific September. For this
week’s actual forecast, each destination links to its live page below.
Park City
UT
- Clear days, September
- 30%
- Sample size
- n=240 days
- Avg high
- 70°F
- Early September (1st–15th)
- 41%
- Late September (16th–end)
- 19%
- Rain frequency
- 32% of days
Steamboat Springs
CO
- Clear days, September
- 52%
- Sample size
- n=240 days
- Avg high
- 74°F
- Early September (1st–15th)
- 64%
- Late September (16th–end)
- 39%
Compare Park City vs Steamboat Springs 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.