Once the war began in September 1939, German newspapers were no longer allowed to print the weather report. It was thought that might be of assistance somehow to the British and the French air forces. (Source: Berlin At War). It wasn’t, of course since both the Royal Air Force and the French Armée de l’Air, had competent meteorologists on staff. In fact, as the war went on, the Allies made a concerted and highly successful effort to destroy Germany’s ability to collect weather data which hindered German operational planning.