Why do we get flat tires in the winter?

Tires lose psi (pounds per square inch) in the winter primarily due to the effects of temperature on air pressure. Here's how it works:

1. **Temperature Drop**: As temperatures decrease, the air inside the tire cools down and contracts. For every 10°F drop in temperature, tire pressure can decrease by about 1 psi.

2. **Density of Air**: Cold air is denser than warm air, which means that when temperatures fall, the molecules in the air move closer together, resulting in lower pressure in the tire.

3. **Moisture and Humidity**: Changes in humidity can also affect tire pressure. Humid air contains more water vapor, which is lighter than the nitrogen and oxygen that make up most of the air we breathe. When temperatures drop, the moisture in the air can condense, further contributing to a reduction in tire pressure.

4. **Inflation Levels**: If tires were not properly inflated before winter, the drop in temperature can exacerbate this issue, leading to even lower psi levels.

To mitigate these effects, it's a good idea to regularly check and maintain your tire pressure during the colder months. Keeping your tires properly inflated not only ensures better traction and handling but also improves fuel efficiency and extends tire life.