Mount Williams is a mountain in the Canterbury Region of New Zealand.
Mount Williams is located northwest of Christchurch and east-southeast of Arthur's Pass in Arthur's Pass National Park. It is set in the Southern Alps of the South Island. Precipitation runoff from the mountain's west slope drains into the Mingha River, whereas the east slope drains into the Edwards River. 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. Topographic relief is significant as the summit rises above the Edwards Valley in one kilometre, and above the Mingha Valley in 1.5 kilometres. The nearest higher peak is Dome, 3.5 kilometres to the southeast.
Based on the Köppen climate classification, Mount Williams is located in a marine west coast (Cfb) climate zone. 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.
Climbing routes:
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. This feature's toponym has been officially approved by the New Zealand Geographic Board.