Comments by "Christopher Conard" (@christopherconard2831) on "Christmas at Stalingrad | Battlestorm Stalingrad E46" video.

Clouds provide a layer of protection to keep the radiating heat from leaving at night. This is why deserts can have such wide swings in temperature from day to night. It can also get so cold in northern areas that condensation for fog or low clouds doesn't happen. From limited experience in the US, 30° F with often be overcast. But 0°F or less will be perfectly clear. So cold, but machinery still operates, and you can't fly because of visibility issues and severe icing. When it finally gets cold enough to be perfectly clear, the machines stop working. The usual solution if you can't put something in the protected area, like a heated hanger, is to leave the engines running. But fuel was critically short, so they probably weren't allowed to do that.
2
 @TheImperatorKnight So I assume a 28 part in depth review of the Battle of the Bulge (With prologue episodes explaining how it got to that point, of course) is right out of the question?
1