ERA5 almanac comparison — 8 years of real data
San Luis Obispo vs Yellowstone: weather in April
San Luis Obispo edges out Yellowstone for sun in April: 26% clear historically versus 0% (8-year ERA5 average, a 26-point gap). Both are viable — San Luis Obispo is the safer bet.
What you are reading: 8-year historical averages, not a forecast.
Either destination can still surprise you this specific April. For this
week’s actual forecast, each destination links to its live page below.
San Luis Obispo
CA
- Clear days, April
- 26%
- Sample size
- n=240 days
- Avg high
- 68°F
- Early April (1st–15th)
- 25%
- Late April (16th–end)
- 28%
- Rain frequency
- 10% of days
Yellowstone
WY
- Clear days, April
- 0%
- Sample size
- n=240 days
- Avg high
- 38°F
- Early April (1st–15th)
- 0%
- Late April (16th–end)
- 0%
Compare San Luis Obispo vs Yellowstone 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.