There's one scenario where you might keep temperature in mind. If you pump up the tires in an indoor environmentally controlled room, then take the bike out into very hot or cold weather, it could be a factor. Air conditioners and heaters are real things. Obviously, if you fill your tires with 72 degree air, and then ride in 90 degree heat, there will be some pressure increase. Don't know how noticeable it might be, but if you're one of those super high pressure guys, use outdoor air.