How Cold Is the Summit of the Himalayas? Everest as Benchmark

Temperature Ranges

• Average annual summit temp: −30 °C to −35 °C (−22 °F to −31 °F).
• Winter (Dec–Feb): −40 °C to −60 °C (−40 °F to −76 °F); record lows near −70 °C (−94 °F) with wind chill.
• Summer (Jun–Aug): −10 °C to −20 °C (14 °F to −4 °F); rarely above freezing.

Why So Extreme?

• Altitude: 8,848 m (Everest) → ⅓ sea-level oxygen, minimal atmospheric heat retention.
• Radiative cooling: Snow/ice reflects insolation; longwave radiation escapes to space.
• Jet stream: 100+ km/h winds strip boundary layer, amplify wind chill.

Other 8,000m Peaks

K2, Kangchenjunga, Lhotse, Makalu, Cho Oyu, Dhaulagiri, Manaslu, Nanga Parbat, Annapurna I, Gasherbrum I/II, Shishapangma, Gyachung Kang — all share similar thermal regimes.

Human Limit

Without supplemental oxygen, consciousness fails above 8,000 m ("death zone"). Frostbite occurs in minutes on exposed skin at −40 °C + wind.