Originally Posted by
HooKooDooKu
A recent camping trip to GSMNP had me camping near Gregory Bald at an elevation of about 4,600' Had my thermometer with me and can confirm the morning temperature was right at 50º-51º
I carried my Mountain Hardware UltraLamina 32º bag. Sleeping in shorts, short sleeve shirt and wool hat inside a tent, I was on the border of feeling a little to cold (slightly uncomfortable, but not uncomfortable enough I wanted to unzip from the sleeping bag to get some more cloths on).
Snugpak's website claims a temperature rating of 7ºC (45ºF). So based on my experience, you'll need something extra (blanket, long sleeve shirt, etc) any time temperatures fall below 65º.