ERA5 almanac comparison — 8 years of real data
Boston vs Park City: weather in May
Boston edges out Park City for sun in May: 17% clear historically versus 1% (8-year ERA5 average, a 16-point gap). Both are viable — Boston is the safer bet.
Boston
MA
- Clear days, May
- 17%
- Sample size
- n=248 days
- Avg high
- 68°F
- Early May (1st–15th)
- 9%
- Late May (16th–end)
- 25%
- Rain frequency
- 38% of days
Park City
UT
- Clear days, May
- 1%
- Sample size
- n=248 days
- Avg high
- 57°F
- Early May (1st–15th)
- 0%
- Late May (16th–end)
- 2%
- Rain frequency
- 47% of days
Frequently asked
Is Boston or Park City warmer in May?
Boston runs warmer by day in May. Boston averages highs of 68°F (highs n=248 days); Park City averages highs of 57°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Boston or Park City in May?
Days with measurable rain: Boston 38%, Park City 47% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in May, Boston or Park City?
Boston edges out Park City for sun in May: 17% clear historically versus 1% (8-year ERA5 average, a 16-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.