Originally Posted by Elan

Yes temperature makes a huge difference + you driving and warming your tires up. Mine did the same thing. When it was super cold, I got a low pressure light. As it warmed and I drove, the light went out. Very typical in winter. If you want accurate TPMS readings, check them at 59 degrees. That's standard temp and should give you most accurate reading. If you drive however, expect higher readings than if you hadn't.