Why Mount Everest Is Especially Dangerous in Summer

Monsoon Season Hazards

Summer (June–August) brings the South Asian monsoon to Everest, amplifying objective dangers:

1. Avalanche Surge – Heavy snowfall + warming = unstable slabs; wet-slab avalanches become frequent.
2. Rockfall & Icefall – Meltwater lubricates joints; seracs collapse in the Khumbu Icefall.
3. Altitude Illness (AMS/HAPE/HACE) – Unchanged, but slower acclimatization in stormy weather increases exposure time.
4. Unpredictable Weather – Whiteouts, high winds, sudden storms trap climbers above the "death zone."
5. Crowding – Peak season queues at bottlenecks (Hillary Step, Lhotse Face) cause exhaustion and frostbite.
6. Fatigue & Decision Impairment – Prolonged exertion in hypoxia degrades judgment.

Why Some Still Climb Then

Warmer temps, longer daylight, and established logistics attract commercial expeditions. But the risk/reward ratio is widely considered worse than spring (pre-monsoon) or autumn.