ERA5 almanac comparison — 8 years of real data
Boston vs Park City: weather in October
Boston edges out Park City for sun in October: 12% clear historically versus 2% (8-year ERA5 average, a 10-point gap). Both are viable — Boston is the safer bet.
Boston
MA
- Clear days, October
- 12%
- Sample size
- n=248 days
- Avg high
- 63°F
- Early October (1st–15th)
- 17%
- Late October (16th–end)
- 7%
- Rain frequency
- 31% of days
Park City
UT
- Clear days, October
- 2%
- Sample size
- n=248 days
- Avg high
- 55°F
- Early October (1st–15th)
- 5%
- Late October (16th–end)
- 0%
- Rain frequency
- 26% of days
Frequently asked
Is Boston or Park City warmer in October?
Boston runs warmer by day in October. Boston averages highs of 63°F (highs n=248 days); Park City averages highs of 55°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Boston or Park City in October?
Days with measurable rain: Boston 31%, Park City 26% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in October, Boston or Park City?
Boston edges out Park City for sun in October: 12% clear historically versus 2% (8-year ERA5 average, a 10-point gap). Both are viable — Boston is the safer bet.
Compare Boston vs Park City 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.