Thin dry mountain air makes low temperatures feel warm to travelers

Evidence

In this dry air it is quite warm if there are only a few degrees of frost. The sun does not rise in Georgetown till eleven now; I doubt if it rises there at all in the winter! — Isabella L. Bird, A Lady’s Life in the Rocky Mountains, 214

Categorization

• CANDY: A tweetable paradox of travel: warm weather at a few degrees of frost, and a sun that rises at eleven if at all.