Overview
- The centuries-old 100-year calendar flags 'great cold' in mid-April and warns many garden plants could freeze.
- Forecasts from wetter.com issued on April 13 point to 16–20°C and mostly dry or partly cloudy conditions in major German cities, not frost.
- Germany's national weather service, the DWD, says any match between the calendar and real weather is coincidence and that reliable outlooks reach about 10 to 14 days.
- Gardeners are advised to cover tender shoots or move pots indoors because late frosts do occur in Central Europe in April.
- The calendar traces to 17th-century abbot Mauritius Knauer, labels 2026 a 'Mercury year,' and portrays the season as colder and drier.