You'd be surprised, even +5C during the day will turn that shallow frozen water back to liquid. But when it hits, it happens quickly. Every year people dogsled

You'd be surprised, even +5C during the day will turn that shallow frozen water back to liquid. But when it hits, it happens quickly. Every year people dogsled on a lake outside Whitehorse, Yukon in November. Often it's pure liquid on November 20th, and yet they will dogsled on it before the last day of the month.