In 1940 the ice had a record 41cm of thickness, in 1941 and 1942 the winters were harsh and the thickness of the ice was not a concern either. Only in 1917 was

In 1940 the ice had a record 41cm of thickness, in 1941 and 1942 the winters were harsh and the thickness of the ice was not a concern either. Only in 1917 was the ice on the thin side at 15cm, which is the minimal thickness for the event to be considered still today. The standards haven't changed much. The climate has.