An old German farmer's rule suggests that the weather on February 21st and 22nd, known as "Felix und Petrus" days, can predict the weather for the following 40 days, extending to Easter. Meteorologists forecast mixed weather for these days in 2026, with rain and temperatures ranging from 3 to 13 degrees Celsius across major German cities like Munich, Berlin, Hamburg, Cologne, and Frankfurt. If the rule holds true, this indicates a consistently changeable and wet period until early April, with milder temperatures hinting at an early spring. While scientifically unproven, these traditional weather predictions highlight a historical connection between weather observation, rural life, and cultural heritage, with people continuing to observe and interpret them annually.