>>2831934West Coast and PNW at elevation. Is this some kind of trick question?
Timberline Lodge is near Mt. Hood in Oregon, maybe 2 hours from Portland. High temps this time of year are mid 60’s to mid 70’s, lows around 50. The mountain can be snow capped year round and contains several permanent snowfields and glaciers. Again, it’s only a couple hours from a major city.
The east side of Yosemite is the same. Tuolumne is at like 8,600ft. Highs are 60’s and 70’s, lows dipping under 40. Tioga Pass is nearly 10,000ft so you lose another 5+ degrees; it can freeze up there this time of year (summer).
This holds true for basically anyplace on the West Coast, particularly around California. Lapse effect from elevation gain ensures cooler temperatures, and places at higher elevations are easily accessible to tens of millions of people.
“Summer is the best time to go outside and enjoy the great outdoors” is just another facet of the California Effect. Because there are so many people with easy access to outdoor recreation, huge number of national parks, and an early foothold on media (Backpacker Magazine), California has an overreaching, heavy handed influence on outdoor recreation.
