[f6bits]

I found this at TireRack:

The rule of thumb is for every 10° Fahrenheit change in air temperature, your tire's inflation pressure will change by about 1 psi (up with higher temperatures and down with lower).

Other stuff I read is that “Cold” means in the morning before the sun shines on it.

With the above in mind, if it’s a big temperature swing, I inflate to a pound or two below max in the morning.