GM, in Greece we have the exact opposite: during the period of 15th of December and 15th of February , in the heart of the winter, there are days of continuous sun and heat, something like spring / summer. Those are the days of Alkyonis, which was the daughter of Aeolos, god of the wind. When the husband of Alkyonis died she transformed to a bird (common kingfisher - named Alkyonis in Greek) and Zeus commanded to have good weather for 2 weeks in order for the bird to be able to born her eggs. During spring it is a lot uncommon to have again even fragments of winter, only in the mountains and the north region maybe.