According to the folk calendar - Sidor Bokogrey

According to the folk calendar, Sidor Bokogrey is celebrated on May 27 (the old style date is May 14). The name of the holiday is given in honor of two saints - Isidore of Chios and Isidore Tverdislov. On this day, the Orthodox Church honors their memory. The story of Isidore of Chios began in the 3rd century in Alexandria. The Christian got a job in the military, but there his subordinates were required to make sacrifices to pagan idols. Isidore refused and continued to honor the Lord. For this, the pagans tortured the warrior, and then cut off his head. Isidor Tverdislov lived in the 15th century and was from a German Catholic family. Having set off on a journey across countries, he stopped in Rostov, learned about Orthodoxy and accepted it. For his ascetic life, the Lord rewarded the saint with the gifts of seeing the future and working miracles. People called Sidora (Isidora) Bokogrey. By this day, cold winds from the north stopped blowing, and they were replaced by southern ones. Due to this, it seemed that the sun was warming up more, and hot days began. Residents tried to have time to plow the field by the day of Sidor, since then the rains could come. But grain crops could be sown in moist soil, as long as the weather was warm. On Sidorov day, swifts and swallows returned from the south - the messengers of warm weather. Their earlier appearance always pleased the peasants, but stable warming was observed only after the arrival of a whole flock. Seeing the first swallows, the girls rushed to wash their faces with milk, because they believed that this would preserve their beauty and prolong their youth. Sometimes Sidor was called Borage, since on this date cucumber seedlings were planted in gardens. It was believed that this way they would grow sweet and juicy, and during salting they would be preserved for a long time. In order to find out what the cucumber harvest would be like, the peasants hung a wet cloth on the street at night. If it remained wet in the morning, then they expected a lot of cucumbers. Even on Sidor Bokogrey they were planting flax. They tried to plant it after rainfall in moist soil. Also on this day, a ritual was performed to attract wealth. To do this, they read a special spell and threw a bunch of burdock seeds behind their back over their left shoulder. If it was a cool day on Sidor Bokogrey, then summer was expected to be the same. The flight of swallows high in the sky meant that the weather would remain warm and clear, but the low flight was observed to indicate precipitation. A red sunset foreshadowed windy and rainy weather. The singing of a quail was heard on a sunny day.