ERA5 almanac comparison — 8 years of real data
Jackson Hole vs McCall: weather in September
Essentially a tie in September: Jackson Hole is 34% clear historically, McCall is 34% clear (8-year ERA5 average) — within the noise. Avg high 70°F vs 70°F. Pick based on flight time or price, not weather — the weather won't decide this one for you.
Jackson Hole
WY
- Clear days, September
- 34%
- Sample size
- n=240 days
- Avg high
- 70°F
- Early September (1st–15th)
- 48%
- Late September (16th–end)
- 21%
- Rain frequency
- 23% of days
McCall
ID
- Clear days, September
- 34%
- Sample size
- n=240 days
- Avg high
- 70°F
- Early September (1st–15th)
- 49%
- Late September (16th–end)
- 19%
- Rain frequency
- 22% of days
Frequently asked
Is Jackson Hole or McCall warmer in September?
Equally warm by day in September. Jackson Hole averages highs of 70°F (highs n=240 days); McCall averages highs of 70°F (highs n=240 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Jackson Hole or McCall in September?
Days with measurable rain: Jackson Hole 23%, McCall 22% (n=240 and n=240 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in September, Jackson Hole or McCall?
Essentially a tie in September: Jackson Hole is 34% clear historically, McCall is 34% clear (8-year ERA5 average) — within the noise. Avg high 70°F vs 70°F. Pick based on flight time or price, not weather — the weather won't decide this one for you.
Compare Jackson Hole vs McCall 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.