Popular name (in dialect "Eismander", in France Saints Glaces) for several name days of Christian saints. In the period from 12 to 15 May, Central Europe often experiences dreaded cold snaps with frost (late frost) and snow. After some nice mild days, there are once again strong cold air advances from the polar regions due to high pressure over Great Britain or Scandinavia.

The air coming into Central Europe is then cold and dry and the temperature barely rises above 15 °Celsius. There is a particular risk of ground frost on clear nights. Plants that are already in bloom, such as vines or trees, can be severely damaged as a result. However, there are regional differences in the date, as the cold air reaches northern Germany one day earlier and southern Germany, Switzerland and Austria one day later.
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