According to weather underground that was the high for the valley floor last April 15 (not that I mind). And when I was there a couple of years ago a week after Labor Day we got snowed on (that made coming down off Half Dome in shorts and t-shirts a lot of fun).
Again, that is not the standard, but people probably need to be prepared for the possibility (nothing sadder than a campsite full of people sleeping in their cars with heaters on) of it being pretty cold.
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