Max tire pressure and daily temperature changes

As Gonzo42 states, 1 psi per 10 degrees ambient temperature change. With a 40 deg change we are only looking at 4psi increase / decrease in the tire pressure. I am very particular about tire pressures, so I generally check pressures first thing in the morning at the coolest time of day. I started doing this when I noticed a substantial difference in left / right tire pressures from the sun beating on one side of the vehicle. A couple of psi difference left and right IS a big deal (to me).