IIRC, you lose 1psi for every 10 degrees of temperature.
Two weeks ago I was driving around 32 degrees and was getting a light, but as the tires heated up it went away. Came back again after sitting. I had set my tires to 35psi when the ambient was about 80 degrees.
FWIW, The TPMS is set to signal when pressure drops below 27psi. I've heard that there are other conditions that will trigger it too, like sudden pressure loss, or sudden change in temperature. I wish you could just cycle thru to see which tire is low, like you could on the 350Z! Nissan cheaped out on that one!
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