There is a temperature too low indicator also? I have flown my FPV and my Mavic three at 20 below and colder without getting any indication of it being too cold. I wonder if the Mini3 will be different
Other DJI drones have a low temperature warning so I assume the
M3P does as well.
It's really important that the batteries stay warm, and are kept warm prior to flying either with a heater or against your body. It's generally not advisable to fly in temperatures that low and that is well outside of DJI specification. Also make sure you RTH very early as the cold temperatures will make them drain much more quickly and also unpredictably (I.e. you might have 60% one minute and 0% the next). Lithium batteries REALLY do not like being cold (it decreases the chemical activity within the battery), especially when they're low and in use, and it's a great way to lose your drone if you aren't careful. Another thing that can happen in the cold is if you make the drone work too hard, you can get a voltage drop and your drone will fall out of the sky. If you must fly in the cold, hover the drone for a few minutes first or fly it very gently close to the takeoff point until it can warm up. Keep an eye on your battery temps in the app.
Basically any temperature extreme is a bad idea with a LiPo. They swell or rupture if they get too hot, ruining the battery, and they can simply die unexpectedly in the cold while in use, and you lose your drone.
Another thing that can happen if it's really cold is you can get ice on the props or other areas of the drone if there is moisture or a build up of condensation, and you can imagine how that might end

You also don't want condensation inside the drone or inside the camera lens, so you need to take additional precautions when bringing the drone from your warm car out into the cold or from the cold back into a warm environment - putting it in a plastic bag helps but it's better to just avoid such extreme temperature scenarios if possible.