Though it may be cooler as you go up, I find that I don't have to add clothes at all as you warm up from the hiking. Also, 49 degrees on the summit of Mt Whitney feels warmer than 49 degrees in most area because the humidity is low compared to places like San Diego, L.A., San Francisco or the Central Valley. I'm going up on Wednesday also and I'll wear my usual, shorts and a short sleeve, possibly long sleeve to keep the Sun exposure to a minimum. Bring a hat that covers your neck.
"Turtles, Frogs & other Environmental Sculpture"
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If less is more, imagine how much more, more is -Frasier
