Proper adjusted tire inflation pressure for 28 psi based on atmospheric temperature.
Use tire inflation temperature chart below to identify tire pressure fluctuation with changes in temperature in order to adjust tire pressure and maintain it at recommended level of 28 psi.
For example, your car's recommended tire pressure is 28 psi, and you inflate your tires to that recommended level inside your garage where temperature is 80 °F. Then you decide to park your car outside, where temperature is 60 °F. That means temperature changed by -20 °F, and your tire pressure fell by about 1.51 psi and now is 26.49 psi instead of recommended 28 psi. You should inflate your tires to their recommended tire pressure levels.