page_title: Mount Thomson
section_title: Climate
hierarchical_section_title: Mount Thomson / Climate
caption_attribution_description: English: Mount Thomson in winter
context_page_description: Mount Thomson is a prominent 6,554-foot mountain summit located in the Alpine Lakes Wilderness in eastern King County of Washington state. It's part of the Cascade Range and is a half mile east of the crest of the range. Mount Thomson is situated 4 mi northeast of Snoqualmie Pass on land managed by Mount Baker-Snoqualmie National Forest. Precipitation runoff on the mountain drains into the Middle Fork of Snoqualmie River. The nearest peak is Alaska Mountain 0.81 mi to the southeast, and the nearest higher peak is Chikamin Peak, 2.08 mi to the east. The mountain was named for Reginald Heber Thomson, a Seattle city engineer who reshaped the face of Seattle. The first ascent of the peak was made in 1917 by Joe Hazard and B. French.
context_section_description: Mount Thomson is located in the marine west coast climate zone of western North America. 
   Most weather fronts originate in the Pacific Ocean, and travel northeast toward the Cascade Mountains. As fronts approach, they are forced upward by the peaks of the Cascade Range, causing them to drop their moisture in the form of rain or snowfall onto the Cascades (Orographic lift). As a result, the west side of the Cascades experiences high precipitation, especially during the winter months in the form of snowfall. Because of maritime influence, snow tends to be wet and heavy, resulting in high 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. The months July through September offer the most favorable weather for viewing or climbing this peak.
caption: Mount Thomson in winter
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