ERA5 almanac comparison — 8 years of real data
Big Sky vs Santa Fe: weather in May
Santa Fe is the clear winner for sun in May: 41% of days historically clear versus just 0% in Big Sky — a 41-point gap across 8 years of ERA5 data. 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.
Big Sky
MT
- Clear days, May
- 0%
- Sample size
- n=248 days
- Avg high
- 49°F
- Early May (1st–15th)
- 0%
- Late May (16th–end)
- 0%
Santa Fe
NM
- Clear days, May
- 41%
- Sample size
- n=248 days
- Avg high
- 72°F
- Early May (1st–15th)
- 35%
- Late May (16th–end)
- 46%
- Rain frequency
- 19% of days
Compare Big Sky vs Santa Fe 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.