Ice Saints
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The Ice Saints is the name given to St. Mamertus, St. Pancras, and St. Servatus in German, Austrian, and Swiss folklore. They are so named because their feast days fall on the days of May 11, May 12, and May 13 respectively. The period from May 12 to May 15 was noted to bring a brief spell of colder weather in the Northern Hemisphere under the Julian Calendar. With the change to the Gregorian Calendar, however, the equivalent days would be May 19–May 22.