Overview

• The Ice Saints period, spanning May 11–15, traditionally signals potential late frosts, with regional variations in observed dates across Germany.
• Current forecasts from the German Weather Service indicate nighttime lows of 5–12 °C and daytime highs up to 26 °C, making frost occurrence uncertain for 2025.
• Climate change has reduced mid-May frost risk in Southern Germany to below 50%, while the growing season now starts up to three weeks earlier than in the past.
• The 100-year calendar predicts rain from May 7–16 and a potential cold snap around May 23, though its reliability is debated.
• A secondary cold spell, known as Schafskälte, is expected between June 4 and June 20, posing another potential frost risk for sensitive crops and plants.