Mamert, Pancrace, Servais and Boniface. These names may not mean anything to you. They represent the Ice Saints, who correspond, in Central Europe, to the days of May 11 to 14. Traditionally, they refer to a belief that temperatures will cool down during those four days. Once this period has passed, the frost no longer represents a risk for agriculture. Some customs add other dates, such as Saint-Urbain, once celebrated on May 25, which once passed, as the saying goes, reassures the winegrower. But these traditions are being undermined by climate change. And if we still wanted to talk about ice saints, then we would have to change the dates.