Proper cold weather tire inflation practice?

One thing about putting air in the tires when it is cold out (I mean really cold, like below zero), is that the air can contain moisture and will freeze and hold the valve open. The result is a flat tire. For the last 40 years I have never put air in my tires in the cold unless it was absolutely necessary. Then you make sure you over inflate slightly and then push the valve down to release some air. Then of course put the valve cap on. I have my own compressor so very rarely would need to use the gas station units but still it is something to keep in mind while you are adjusting pressure due to temps.