Originally Posted by wa8yxm
That means if you attached in August, in Feb they were alarming. (At least in Michigan)
If I read this correctly, you are getting the alarm because you actually ARE under inflated, in this specific case. The "cold" tire pressure that a tire is inflated to is based on TWO environmental conditions:
1) on a "cold," that is undriven tire, AND
2) at the ambient temp where the tires will be operated.
If you inflated to the correct pressure in 80degree August, you MUST add air by the time 20degree February comes around and of course, let air out when August returns in order to maintain proper inflation. Further, if you check your tire pressure inside a heated garage in the winter, then you'll need to compensate for the fact that the outside temp where the tire will be operated is lower than the heated garage.