Absolutely this. It's not about driving through snowdrifts (in Scandinavia their winter tyres have metal studs in, including for bicycles!), but having far better grip and stopping distance in the wet and lower temperatures because of the compound. Summer tyres get hard in lower temperatures and are less good at shedding water. Equally winters will lower fuel economy and have worse grip in summer. I fit winter tyres in Cornwall, even on the Herald. It does get below 7 (hovering around zero right now) and it certainly gets wet. As the only parts in contact with the road, tyres are my most important purchase on the car, and keeping two sets isn't much of a hardship rather than 'all season' ones that aren't great at anything.Winter tyres have a different compound, so give better grip in temperatures below 7deg. C., they're not all about driving on snow or ice, but are more pliable and therefore contact the surface better.
