Ditto
Also figure about 1 psi change for every 10 deg change in temp. Cold pressure is generally based on an ambient temperature of 60 deg Fahrenheit.
So if car has been sitting out in the sun with an ambient temperature of 80 deg Fahrenheit, then when you check and adjust pressure you want to compensate by setting at 2 deg below your intended pressure. So if you want to run 30, inflate to 32.