As the temperature outside drops, so does the air pressure in your tires. In fact, for every 10 degree decrease in temperature, your tire pressure will drop about 1 psi. So if it's 20 degrees outside and your tire pressure is at 30 psi, it could drop down to as low as 25 psi when the temperature plummets.
While this may not seem like a big deal, driving on underinflated tires can have serious consequences. For starters, it reduces fuel economy because your engine has to work harder to move the car forward. Additionally, underinflated tires increase wear and tear on the treads since they're not making full contact with the road surface. This can lead to blowouts and other accidents.
To avoid these problems, check your tire pressure regularly (at least once a month) and inflate them to the recommended level for both cold and hot weather conditions. Doing so will help you save money at the pump and keep you safe on the road all winter long!