How Do I Know It’s Crazy Cold?

Right now, we reached our high temp for today...19 F.  It's stinkin' cold.  Heat is on at the office (and the house), but I haven't been able to stay warm today.

So much so, that I've done something I won't typically do.  I've worn my coat all day today.  Is it just me?  What are you doing to stay warm?

Oh, by the way, our low tonight will be 4 F and we won't be above freezing in the daytime until Friday or Saturday.