The consumer reports article says:
If you own a car with summer tires, refrain from using it at all in cold temperatures as the tires may crack. Leave it parked. Beyond cracking concerns, summer tires have diminished grip below 40º F on dry and wet roads and virtually little to no grip on snow and ice.
The cracking is characterized as cosmetic, but in our experience any cracking shouldn’t be taken lightly as it can evolve over time.
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