[1][4] Precipitation runoff and glacial meltwater from this mountain drains into tributaries of the Lillooet River.

In-SHUCK-ch Mountain is more notable for its steep rise above local terrain than for its absolute elevation as topographic relief is significant with the summit rising 2,186 metres (7,172 ft) above Little Lillooet Lake in four kilometres (2.5 mi).

[7] 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 of July and August offer the most favorable weather for climbing or viewing In-SHUCK-ch Mountain.