Based on the Köppen climate classification, Mount Jupiter is located in the marine west coast climate zone of western North America.[5]Weather fronts originating in the Pacific Ocean travel northeast toward the Olympic Mountains. As fronts approach, they are forced upward by the peaks (orographic lift), causing them to drop their moisture in the form of rain or snow. As a result, the Olympics experience high precipitation, especially during the winter months in the form of snowfall.[6] Because of maritime influence, snow tends to be wet and heavy, resulting in avalanche danger. During winter months weather is usually cloudy, but due to high pressure systems over the Pacific Ocean that intensify during summer months, there is often little or no cloud cover during the summer.[6] In terms of favorable weather, June to October are the best months for hiking up the mountain.[7]
^Olympic Mountains: A Climbing Guide, Olympic Mountain Rescue, Fourth Edition, 2006, The Mountaineers Books, page 103
^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.
^ abMcNulty, Tim (2009). Olympic National Park: A Natural History. Seattle, Washington: University of Washington Press.
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