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Just checked my pressures, reading 30 all around. This is with ambient temp at ~28F, and after sitting 1.5 hrs post-commute.
Would the low ambient temp cause them to read lower?
The tire label specifies certain max pressures cold, but what is cold?
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MINIless for the immediate future. :(
Previously owned:
06 Justa Cooper Astro Black
03 MCS BRG and lotsa mods
06 MCSA HB and even more mods
Your tire pressure will go up, or down 1 psi for every 10F ambient change. That being said, you should check and change your tire pressure as the weather changes. Keeping in mind that the pressure will go up 3-4 psi as the tires warm up while driving. Depending on your driving style, of course.
i check my tires early morning or late evening giving 4-5hrs cool down time
before i measure. if your car's parked outdoors measure it when the
sun is not out as direct sunlight can alter the tire pressure by 2-3psi
on one side of the car.
i like to run 33psi on my civic and legacy up to +3/-2 psi.
they recommend 30 and 31 psi cold, but i know they go for comfort
more than performance so i use the higher end.
on my MCS which is garaged during the week i check tire pressure
Friday night so that im ready to go on Sat morning. i usually run
about 34 +1/-0 psi. unfortunately due to snow, my MCS will not
be driven for some time...
i usually run 
