Based on the Köppen climate classification, Deception Peak is located in the marine west coast climate zone of western North America.[6] 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. Winter temperatures can drop below −20 °C with wind chill factors below −30 °C. This climate supports the Sphinx Glacier on the northeast slope of the mountain, the Sentinel Glacier to the south, and the Phoenix Glacier to the southeast.
Gallery
Deception Peak centered, northwest aspect.
Deception Peak (left), Guard Mountain, and Mount Garibaldi (right) from Panorama Ridge
^Peel, M. C.; Finlayson, B. L.; McMahon, T. A. (2007). "Updated world map of the Köppen−Geiger climate classification". Hydrol. Earth Syst. Sci. 11. ISSN1027-5606.