I'll bet this has been asked numerous times, but I tried a few different searches and struck out.
I found a listing on the NPS website for the typical high and low temps for each month in Yosemite Valley, but didn't see any thing with average temps at the higher elevations. We'll be taking a backpacking trip in mid to late July and I'm trying to figure out what is the best temperature rating for the sleeping bag I need to buy. We'll spend the first night camping in the valley then up to the north rim at Yosemite Falls and work our way around the valley clockwise coming back in at Happy Isles. Our highest night will probably be in the May Lake area which looks to be a little over 9000 feet. Is a 30 degree bag going to be too warm? I'm planning to be in a 3 season tent with an open top (rain permitting) if that makes any difference.
thanks