Yeppers, damp from perspiration. Last year, I took my TNF Apex gloves off at 14,000' to eat a Clif bar when I put them back on they were covered with frost. If you are hiking all night and arrive to cold windy summit with damp this and that you are going have a very uncomfortable stay.
I've only hiked wearing my FF Hyperion Down Jacket during the 3-seasons once...descending from Mt. Whitney in September 2004. The weather can get downright miserable on this summit in the summer/early fall when sun is shining.
Every year is different, all I tell folks is what you can run into. Heck, in 2004, the temperature readings the week before at the Cottonwood Lakes Reporting Station were 10-11* F at night. If this these temperatures would have persisted it would have altered our clothing, gear and hiking plan.
