The German State of Bavaria requires winter tires for POVs. Drivers can be fined for not having appropriate tires for the driving conditions. All season tires are a compromise.
Tread designs and tread compounds are designed to be used on rain & dry roads
Tread designs and tread compounds are designed to be used on snow and ice
All Season Tires
All-Season tires are a compromise but
All Season Tires – Safety Information
By design, All-Season tires are a compromise intended to provide acceptable traits under a wide variety of conditions. However, that compromised goal prevents them from being a master of any one of them. The All-Season tire tread designs and compounds that are engineered to provide extended mileages and durability under the summer's sun are less effective in winter's freezing temperatures, and through snow and on ice.
Specific winter tires deliver much better snow and ice performance than All-Season tires because their tread designs and tread compounds are engineered to master those conditions, while summer tires are engineered to deliver better handling in the rain and on dry roads. Why not have the best tires for each of the conditions you'll encounter?
Only winter tires are designed to excel in the colder temperatures, slush, snow and ice that many parts of the country experience for three or more months a year.
Refer to the manufacturer’s description of the tire. If the manufacturer says that the tire was designed for mud & snow (but doesn’t have the M&S or snowflake) then you should get a copy of that from the tire manufacturer or dealer. You should be able to get the description from almost any tire web site.
With regard to fines, it’s recommended to keep a copy of the manufacturer’s tire description in the glove box.