While it’s normal for a car to be idling high when it’s first started, if the idle doesn’t drop to normal after a minute or two, something’s probably wrong.
Check the air pressure using a good-quality gauge. Air pressure can dip by up to 10 psi when the weather gets cold. Check the tires when they’re “cold,” meaning the car hasn’t been driven ...
So, what's the best way to check for the temperature? Ree says that a meat thermometer will be your best friend. "Even if you only use it once a year for this exact purpose, it's worth it," she says.