Like many peaks of the Southern Alps, Mount Williams is more notable for its large, steep rise above local terrain than for its absolute elevation.

[5] Prevailing westerly winds blow moist air from the Tasman Sea onto the mountains, where the air is forced upwards by the mountains (orographic lift), causing moisture to drop in the form of rain or snow.

The months of December through February offer the most favourable weather for viewing or climbing this peak.

[6] Climbing routes:[3] The Spike is a subsummit on the southwest ridge of Mount Williams, with less than one kilometre between summits.

The elevation of The Spike is 1,440 metres and there are climbing routes via Gunbarrel Scree and the Southwest Ridge.