by AlmostThere » Sun Nov 01, 2015 5:22 pm
Summer is peak season for visiting - it will be the most crowded. Winter will be least crowded, and roads will be closed - Tioga Pass and its scenery will be unavailable to you. Spring will be mosquito season, with waterfalls peaking but stream crossings at their most dangerous.
You really have to be clear on what you want to do in Yosemite - if you want to spend time in the valley itself, go backpacking, visit Tuolumne Meadows, see waterfalls -- it's not all going to be possible at the same time without the crowds. There are seasons for all those things. If "somewhat warmer weather" means nights above freezing and days in the 80F range, summer is it. Higher elevations you will find night temps ranging from 30-50F depending, but days will be cooler than they will be in Yosemite Valley, where it can easily be 90-100F in July and August.