As long as load and speed requirements are met, you can use winter tyres year round. Providing tyres meet the load requirements of the vehicle and are road legal, then they are legal.
However the dry braking distances of winter tyres in the summer are rather elongated.
An all season tyre is marginally better usually, but not by much, and sometimes worse, tyre dependant. The exception to all this are the Crossclimate, which are 97% a summer tyre, with braking and stability behaviour to prove it, yet are 95% a winter tyre too, with the traction, braking and stability to prove it. Designated as a summer tyre, with winter certification.
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