Usually a mild climate but be prepared for exceptions
Normally, the weather in Yosemite Valley is rather mild. Summer daytime temperatures are often in the high 80's but sometimes reach 100, especially on the Valley floor. Nights are typically cool, even during the day at higher elevations. Plan to dress in layers for maximum comfort. Winter temperatures range from the high 40s to the mid-20s. Occasionally, days will be in the mid-60s and perhaps a few that go as low as 5 to 10 degrees above zero. A record low temperature of -6 was set in 1924. Dry summers and wetter winters Precipitate ion varies greatly, although
summers tend to be dry, except for an occasional afternoon thunderstorm during late summer in the higher elevations. Rain often starts in October
with the mild fall season. The first snowfall usually comes to Yosemite Valley around mid-November and the last snow may fall during late March or
early April. Generally, the snow
accumulation is less than two feet, but on rare occasions, it has been up to five feet.