My philosophy is that I wouldn't wear flip-flops all winter, so I make sure my car is properly shod. I do around 30-40k per year, and the tyres are the only thing keeping me safe (apart from breaks) on the road. Every year, when the temperature starts to drop below 7 degrees, I fit winter tyres. There is a difference in grip and (lack of) road noise.
Summer tyres under-perform in low temperature conditions. You only have to look at the tread patterns closely to see why winter tyres perform, they have a different pattern and are covered in sipes to allow the tyre to move more freely and grip the road or snow.
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