Cue the theme from "The Exorcist"

What do you get when you combine a 2°C air temperature, a 2°C dew point, frozen ground with snow patches, and nearly-calm winds? Visibility under 100 meters on my commute to the office:

They say we may not see the sun until Wednesday. But they also say it'll be 7°C that day. March came early this year, it seems.