Guides · How to Check Tire Pressure
Tire Pressure in Winter
Cold weather drops PSI. Check on cold mornings and inflate to the door label, not a summer memory.
Short answer
Winter mornings are when many TPMS lights appear. Air pressure falls as temperature falls, often about 1 PSI per 10°F. Inflate to the door-label cold number. Do not add a homemade winter bonus unless the vehicle label says to.
A car that was fine in October can be several PSI low after the first hard freeze. That is physics, not automatically four punctures. Measure all four. If they all dropped about the same amount, fill them. If one dropped much more, inspect that corner.
Check before you start the car when you can. The driveway reading is the one the label assumes. After a highway commute the tires warm and the light may go out even though tomorrow morning will be low again.
Snow and slush hide nails and hide a wet valve. Wipe the stem before you gauge. Keep a gauge in the cabin; glove-box tools get forgotten when you are wearing gloves at a dark pump.
Step-by-step
- 1Check on a cold morning after a temperature drop.
- 2Compare all four tires. Look for a single loser.
- 3Inflate to the door-label cold PSI.
- 4Inspect any tire that needed far more air than the others.
- 5Recheck after the next cold night.
Common mistakes
Waiting for the light By then you have been driving low.
Adding extra PSI 'for snow' Use the label unless it has a loaded winter note.
Checking only after the commute That is a warm reading.
Safety notes
A winter underinflated tire overheats less obviously in the cold but still wears, flexes, and can fail. Fill it.
FAQ
Why did all four drop? Temperature. Fill them and watch for a one-tire pattern next.
Should I use nitrogen in winter? The label still wins. Nitrogen does not skip the cold check.