Absolutely nothing.
I live in Northern California and we are being completely bypassed by the chilly air gripping 2/3 of the nation.
So, I really have no idea what all the fuss is about. We get cold-ish here. I know for a fact it has been 20 degrees Fahrenheit here on occasion. It might even get there this weekend when the weather persons are predicting show on Mt Hamilton. But it is a rare thing. MAYBE once a year occasion.
Don't get me wrong. I do get cold. When that happens I have a surefire method for keeping warm