I was reminded recently of a moment in the Eragon books where the main characters see a "tall" mountain range, and then after a minute realize that the white sky stretching up above them is just mountains too, covered in snow. Which got me wondering - if there was a mountain that reached to space, obviously there would be some point above which snow would not accumulate. Where would this be?
Thoughts: I know most of the Earth's moisture is in the troposphere, so it seems reasonable to assume it would be confined to that region - but higher clouds like nacreous and noctilucent clouds are made of ice crystals, which could conceivably deposit on a mountain. Or would this be rare enough that it would sublimate faster than it could accumulate?