Many car manufacturers do winter tests in Northern Finland. McLaren is one of those. Companies arrange also special events for their customers and press to drive in snowy conditions.
Sport Auto's test driver Christian Gebhardt took Mercedes-AMG GT R to Nordschleife in Adenau, Germany and time was amazing 7.10,92min. Tyres on the hot lap were Michelin Pilot Sport Cup 2.
Watch the hot lap.
That's very impressive time. There are many more powerful cars, which are not even close that time.