ERA5 almanac comparison — 8 years of real data
Jackson Hole vs Las Vegas: weather in May
Las Vegas is the clear winner for sun in May: 88% of days historically clear versus just 3% in Jackson Hole — a 85-point gap across 8 years of ERA5 data. Jackson Hole also sees measurably more rain than Las Vegas this month (35% vs 3% of days). This isn't close.
What you are reading: 8-year historical averages, not a forecast.
Either destination can still surprise you this specific May. For this
week’s actual forecast, each destination links to its live page below.
Jackson Hole
WY
- Clear days, May
- 3%
- Sample size
- n=248 days
- Avg high
- 57°F
- Early May (1st–15th)
- 0%
- Late May (16th–end)
- 6%
- Rain frequency
- 35% of days
Las Vegas
NV
- Clear days, May
- 88%
- Sample size
- n=248 days
- Avg high
- 91°F
- Early May (1st–15th)
- 92%
- Late May (16th–end)
- 84%
- Rain frequency
- 3% of days
Compare Jackson Hole vs Las Vegas 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.