What was the lovest outside temperature when you fly? I know there is writen in the manual range O-4O degrees, but thera are many youtube videos with Phantom flights in winter season or in mountains.

I got my P2V+ last year in December.  I flew it all through the winter with no problems.  You do have to take extra precautions with your batteries - keeping them warm before flight and not charging them up after flying until they are at least back to room temperature.  Your flight times will be shorter too depending on how cold it is.  On the coldest day I flew it was a few degrees below zero.  It has been fairly cold here some days - in the 20's.  I flew the P3 the other day in 25 degree temp.  I will fly it all winter too as long as I can stand standing out there.  I do use a warming pad in my case for the batteries to keep them warm while waiting for use.

Also, it would be worthwhile to look into the operating temperatures for your mobile device.

Excellent advice in the previous posts. You may also want to look at DJI-Tim's recent cold weather battery usage post:
http://forum.dji.com/thread-35249-1-1.html

Phantom Help Posted at 2015-11-17 07:24
Also, it would be worthwhile to look into the operating temperatures for your mobile device.

It would appear that an iPad Air 2 Cellular, and the Phantom 3 Pro' are statistically the same, where safe operation temperatures of the devices are equal. 0*C ~ 40*C. That's good to know.

RedHotPoker

Hi , JK
You can take that video as a reference: http://forum.dji.com/thread-35249-1-1.html
Battery  is very essential especially  when you are trying to fly in winter .