Mountain Weather Travel Guide — Altitude Changes Everything

How Altitude Affects Weather

For every 1,000m of altitude gain:

• Temperature drops by 6.5°C
• UV radiation increases by 10-12%
• Air pressure drops by about 12%
• Oxygen decreases proportionally

Mountain Weather Rules

1. Weather Changes Fast

Mountains create their own weather. A clear morning can become a thunderstorm by afternoon as the sun heats slopes and forces air upward.

2. Temperature Drops With Height

Even if the valley is 25°C, a summit at 3,000m may be just 5°C. Always carry warm layers regardless of conditions at the base.

3. Wind Amplifies on Ridges and Passes

Ridgelines and mountain passes funnel wind, creating gusts far stronger than in the valley. Wind chill can make conditions dangerous.

4. UV Is Stronger

Snow and altitude combine to create extreme UV exposure. Snow reflects 80% of UV rays, effectively doubling your dose.

Packing for Mountain Trips

Altitude Sickness

Above 2,500m, some people experience altitude sickness: headache, nausea, fatigue. Acclimatise by ascending slowly (no more than 500m sleeping altitude gain per day above 3,000m) and staying hydrated.

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