Temperature Gap: Everest Summit vs. Indian Coastline ~60°C

The vertical distance between the top of Mount Everest (8,848 m) and the Indian coastline (sea level) creates one of Earth's steepest thermal gradients.

Typical Temperatures

Why the Gap Is So Extreme

• Lapse rate: ~6.5°C/km (moist adiabatic) → 57°C drop over 8.8 km.
• Latitude effect: Everest (28°N) vs. South India (8–13°N) adds ~5°C.
• Albedo & radiation: Snow reflects; thin air emits little longwave.
• Jet stream: Everest sits in subtropical jet (winter 100+ kt winds → extreme wind chill).

Seasonal Nuance

• Monsoon (Jun–Sep): Summit –15°C to –20°C; coast 28–30°C → gap ~45°C.
• Winter (Dec–Feb): Summit –40°C to –60°C; coast 20–25°C → gap ~65°C.

Human Implications

Climbers traverse thermal regimes equivalent to traveling from tropics to Mars in days. Acclimatization, insulation, and oxygen systems must bridge a 60°C design envelope.