Forecasts are usually for towns in the valley. Summits are colder — about 6.5 °C per 1,000 m on average, more in dry air. Enter the forecast and elevations to estimate what you'll face at sunrise on the mountain.
How it works
T₂ = T₁ − (elevation change ÷ 1000) × lapse rate.
FAQ
Does wind matter?
Yes — use the wind chill calculator for how cold it will feel.
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