According to the folk calendar - Gregory the Winter Indicator

On November 30, Orthodox Christians celebrate the day of remembrance of Gregory the Wonderworker Among the people, the holiday is better known under the names Gregory of the Winter Pointer, Predezimye and Siver, which he received as the day that ends autumn and opens the gates to winter It was believed that by the weather on this holiday one could judge what the coming winter would be like Severe cold foreshadowed bitter frosts Cloudy weather indicated a lack of sun in the next three months