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It's the other way around. Each ten degree increase will increase the pressure by one pound. So tires inflated to 80 psi at 70 degrees will be 81 psi at 80 degrees, and 79 psi at 60 degrees.
I don't know what the median point is, but I suspect if you use 80 psi at 70 degrees, you'll never have a problem. My reasoning for this is you are only talking a 3 pound increase between 70 and 100 (the highest ambient temps most of us will see). On the other end, even if you are in 20 degree temps, the tires will show 5 psi under inflation, but as soon as you start to move, friction will cause the tires to heat up, which will bring the temp, and therefore the psi, back to normal - or at least close to it.
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