El fenómeno climático llamado Eisheiligen en alemán (icy saints – santos del hielo) se refiere al clima frío “tradicional” a mediados del mes de Mayo:
The Ice Saints is the name given to St. Mamertus, St. Pancras, and St. Servatius in Flemish, French, Dutch, Hungarian, German, Austrian, Polish, Swiss and Croatian folklore. They are so named because their feast days fall on the days of May 11, May 12, and May 13 respectively. In Flanders St. Boniface of Tarsus is counted amongst the Ice Saints as well; St. Boniface’s feast day falling on May 14. The period from May 12 to May 15 was noted to bring a brief spell of colder weather in many years, including the last nightly frosts of the spring, in the Northern Hemisphere under the Julian Calendar. With the change to the Gregorian Calendar, however, the equivalent days would be May 23–May 26.