holidays
Christian feast day: Mamertus, the first of the Ice Saints
Related Wikipedia articles
Mamertus
Bishop of Vienne
Mamertus was the bishop of Vienne in Gaul, venerated as a saint. His primary contribution to ecclesiastical practice was the introduction of litanies prior to Ascension Day as an intercession against earthquakes and other disasters, leading to "Rogation Days." His feast day is…Source: Wikipedia (CC BY-SA)
Ice Saints
Weather lore named after a group of saints
The Ice Saints are St. Mamertus, St. Pancras, and St. Servatius. They are so named because their feast days fall on the days of May 11, May 12 and May 13 respectively, which often saw the last cold snap of the season.Source: Wikipedia (CC BY-SA)
May 11
Day of the year
May 11 is the 131st day of the year in the Gregorian calendar; 234 days remain until the end of the year.Source: Wikipedia (CC BY-SA)