[sionnsar]

Around here the early morning fogs start in August, heralding the approach of autumn. (It's not long after that that the spiders grow really large.)

But around December or so we sometimes get freezing fog. That's fog that has been "supercooled" below freezing, but it hasn't turned to ice -- until it hits something like your windshield. Nasty, dangerous stuff.

[Alice au Wonderland]

Freezing Fog

I get a mental picture of airborne black ice.

This stuff freezes on contact? How do you protect your face, if you have to be out in that stuff?