I bear no animosity to the OP, and for all I know he is young and inexperienced, and has thus far lacked a proper teacher in such matters. But I will say that it is quite a shame not to know to check tire pressures routinely, even without temperature swings. If my TPMS had to tell me when adjustment was overdue, I would be ashamed of myself.
This winter is a particular doosey, with the fluctuating (but thankfully warmish) temps.
Bottom line is, we all know about the principal rule of physics - shrinkage!! It happens to air too.
