An unnamed icefield rests on the northern side of the peak, and the Boomerang Glacier lies at the base of the south slopes.

Precipitation runoff from the peak drains into tributaries of the Lillooet and Hurley Rivers.

[5] Most weather fronts originate in the Pacific Ocean, and travel east toward the Coast Mountains where they are forced upward by the range (Orographic lift), causing them to drop their moisture in the form of rain or snowfall.

As a result, the Coast Mountains experience high precipitation, especially during the winter months in the form of snowfall.

The months July through September offer the most favorable weather for climbing Sessel.