Cold weather and tyre pressure warning

[XML]

It is 3C this morning and tyre pressure warning is on, showing all 4 wheels as 2.1 bar, but showing warnings only for 3 wheels. I understand, tyre pressure drops in cold weather but does it mean that the warning will be on every cold morning?
 

 

[GMB]

Yep - Standard  stuff happens every year.  Pv=k  in practice.  Just top 'em up for winter.

[PCM]

Happened to me and my wife...

All tyres WERE a little bit low, so pumped them up.

[Govanguy]

Happened to me last night when I picked up my car from the airport on returning from holiday after 2 weeks. -6c

I have a slow puncture which usually deflates in around 2/3 weeks. 

I thought it was that tyre that was at fault. Blew it up with my small cordless inflator (great gadget) drove off but light remained on. Turns out that the remaining 3 tyres were showing  under pressure. 

Light went off when tyres warmed up during my 40 mile journey home.