Mount Duke is a 2,379-metre (7,805-foot) mountain summit located in the Joffre Group of the Lillooet Ranges, in southwestern British Columbia, Canada.

The highest peak in the Joffre Group, Mount Matier, rises 4.4 km (3 mi) to the west.

[4] 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 Mount Duke.