As unseasonable fall warmth bakes the Rocky Mountain hillsides, veteran snowmaker Tony Wrone has come to terms with the fact that these are no longer the winters of his youth. “Last year, we had a real hard time because it was so warm in November,” Wrone, who began making snow in Keystone, Colo., in 1996, told The Hill. “Back then, I think we opened one year there around Oct. 18 or something like that,” said Wrone, a snowmaking manager at the Aspen Snowmass resort.