Rudolph and Frosty's Christmas in July (1979) on Netflix

Long ago, the evil ice wizard Winterbolt reigned over the North Pole, oppressing the inhabitants and spreading fear and misery with the aid of his two evil snow dragons until Lady Boreal, the Queen of the Northern Lights, ended his tyranny by sending him into a deep sleep. Soon after, Winterbolt is severely weakened by the act. In Winterbolt's absence, a young Kris Kringle comes to the North Pole to build his workshop, and begins his tradition of delivering gifts to the world's children each Christmas Eve as Santa Claus.