Frazil ice can occur in fall, winter, or spring, as long as there is relatively high flow over waterfalls and Yosemite Valley has overnight lows below freezing.
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The average high temperatures in Yosemite Valley are around 50°F (10°C); the average lows are around 30°F (-1°C).
At even higher altitudes, winter is really cold, with night temperatures well below freezing, and the coldest records about -30 °C (-22 °F), while summer is mild during the day and cold at night, with possible slight frosts even in July and August.
Yosemite receives 95% of its precipitation between October and May (and over 75% between November and March). Most of Yosemite is blanketed in snow from about November through May. (Yosemite Valley can be rainy or snowy in any given winter storm.)
The winner: The opportunities for wilderness adventure in Yellowstone are many, but Yosemite has it all, from gentle trails along the floor of the valley to spine-tingling ascents of its rock faces. Plus, Yosemite remains open to many activities through the winter, while Yellowstone goes into bear-like hibernation.
Yosemite temperatures range from the low 20's to the mid-50's during the month of February. Snowfall is frequent, and is typically gathers over a foot tall. The depth of snow increases with altitude. The sun shines on and off for about six hours a day, and icy rainfall is also common.
Within Yosemite National Park, you may not sleep in your car or RV except in a campsite that you're registered to stay in (except at Camp 4, where sleeping in cars is not allowed because it's a walk-in campground). Sleeping in your car along the side of the road is not allowed.
October Weather in YosemiteThat's a perfect temperature for hiking or rock climbing. However, average nighttime temperatures drop to an average of 51°F (11°C). That can make it a little chilly for camping, but ideal for sipping a hot cup of coffee in the morning while looking out the window at the day to come.
May through September is the most popular time in YosemiteThese months correspond with the best weather and are also when all the roads, trails, lodging, shuttles and attractions in the park are open. That includes its most famous drive, Tioga Rd, a 64-mile-long scenic byway that closes when the snow begins to fall.
If you're looking for massive cascades that leave you speechless, Yosemite wins the prize. If you're not too fussed about height but you still want to enjoy the serenity of the water (with the added bonus of being able to see falls no matter what time you visit), go with Yellowstone.
Yosemite is known for its granite cliffs, giant sequoia groves, lakes, mountains, glaciers, waterfalls, and streams. Almost 95% of the park is classified as wilderness and is home to a large variety of plants and animals.
As many as 500 American black bears live in Yosemite National Park. Though they hibernate through the winter, Yosemite's bears spend the warmer months wandering all over the park in search of food — including in developed areas, such as popular Valley campgrounds.