ERA5 almanac comparison — 8 years of real data
Marfa vs Napa: weather in March
Marfa is the clear winner for sun in March: 48% of days historically clear versus just 9% in Napa — a 39-point gap across 8 years of ERA5 data. Napa also sees measurably more rain than Marfa this month (37% vs 7% 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 March. For this
week’s actual forecast, each destination links to its live page below.
Marfa
TX
- Clear days, March
- 48%
- Sample size
- n=248 days
- Avg high
- 72°F
- Early March (1st–15th)
- 40%
- Late March (16th–end)
- 55%
- Rain frequency
- 7% of days
Napa
CA
- Clear days, March
- 9%
- Sample size
- n=248 days
- Avg high
- 63°F
- Early March (1st–15th)
- 4%
- Late March (16th–end)
- 14%
- Rain frequency
- 37% of days
Compare Marfa vs Napa 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.