How can it be so foggy when it’s -2 Fahrenheit with 2 feet of snow on the ground and drifts 5 feet high in the yard?
One way it can it be so foggy when it’s -2 Fahrenheit with 2 feet of snow on the ground and drifts 5 feet high in the yard would be if the wind is bringing warmer air into the area. As relatively warmer air blows over the snow pack ... it cools and condenses into the microscopic cloud particles. In this case ... the cloud is in contact with the ground so it's called fog. Meteorologists refer to this as warm advection fog -- advection meaning the movement of a property ... such as temperature or moisture ... by the wind.
Do you live near a body of water, where the water temp is warmer than the air temp?
Warm moist air coming in contact with cold ground.
I will guess ice fog. Is there an open waterway nearby? A large unfrozen river or lake, say? Usually such an ice fog does not manage to migrate a long distance from the source of the humidity. If there is a regional fog, I would think that there is warm air not very far up above, and the moisture in that air is condensing when it enters the very cold ground-level air.
Maybe you have smoke and moisture together. The moisture is attracted to the smoke particles and collect to look like a mist i the air.
it nnight be the tennperatures doing that
Fog can form in much more extreme conditions than that.