ERA5 almanac comparison — 8 years of real data
Park City vs Portland: weather in May
Portland edges out Park City for sun in May: 14% clear historically versus 1% (8-year ERA5 average, a 13-point gap). Park City also sees measurably more rain than Portland this month (47% vs 32% of days). Both are viable — Portland is the safer bet.
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
Portland
ME
- Clear days, May
- 14%
- Sample size
- n=248 days
- Avg high
- 64°F
- Early May (1st–15th)
- 5%
- Late May (16th–end)
- 23%
- Rain frequency
- 32% of days
Frequently asked
Is Park City or Portland warmer in May?
Portland runs warmer by day in May. Park City averages highs of 57°F (highs n=248 days); Portland averages highs of 64°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Park City or Portland in May?
Park City is measurably wetter than Portland. Days with measurable rain: Park City 47%, Portland 32% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in May, Park City or Portland?
Portland edges out Park City for sun in May: 14% clear historically versus 1% (8-year ERA5 average, a 13-point gap). Park City also sees measurably more rain than Portland this month (47% vs 32% of days). Both are viable — Portland is the safer bet.
Compare Park City vs Portland 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.