[drewm1980]

RE "no water in the air blow freezing", that's not true. In the mountains you can hang your towel up to dry at night. It freezes, then dries through sublimation. Ever seen funny smooth ice formations?

[mchannon]

This sounds like a koan:

"If there is a frozen towel in the mountains, is there water in the air if there is no one there to measure the humidity it produces?"

Assuming there were millions of frozen wet towels in such conditions, any sublimated towel ice would rapidly drop back out of the air as frost.