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. From Wikipedia
High-pressure system 'Simone' sustains dry, sunny days and frost-prone nights, while a Poland low brings isolated showers and cooler temperatures to parts of the country.
