Based on the Köppen climate classification, Mount Dan Fox has a tundra climate with cold, snowy winters, and cool summers. Weather systems coming off the Gulf of Alaska are forced upwards by the mountains, causing heavy precipitation in the form of rainfall and snowfall. Winter temperatures can drop below 0 °F with wind chill factors below −10 °F. This climate supports glaciers covering all slopes of this peak. The months May through July offer the most favorable weather for viewing or climbing Mount Dan Fox.