Answer: 10 degrees eliminates one pound of pressure
Tires with low pressure are dangerous and don’t offer you as much performance or safety. This is typically more of a problem in the fall when temperatures are dropping than the spring when they go the other way.
The type of tire is also very important. A brand new set of snow tires is best in the winter. A half-worn snow tire will give you the performance of an all-season tire. A half-worn all-season tire will give the performance of a summer tire. And a summer tire has no place on snow.
“It’s important to pay attention and make sure performance doesn't change,” Cox said.