its 8 deg celsius here and they are forecasting 15. No snow for xmas either 
So thats like 60% Fahrenheit right? Short sleeve weather? Maybe a light jacket? Dude were looking at like highs of -12 Celsius. Thats the high tempt, and throw 1/2 a foot of snow in with it, "16 centimeters". And then throw in a 25 mph howler from the N/W, 40 km an hour, and your looking at a freeze temp of of about -30 Celsius.
And until you reach about the Kentucky, Missouri, Tennessee, Arkansas break your looking right at the teeth of the Arctic howlers coming down. I was in training with some guys from the deep south who had never even seen snow and they ended up getting assigned to hot loaded B-52s at Minot North Dakota. That means out on the flight line guarding the things on a hot pad, " and "hot" doesn't mean warm". I actually felt sorry for them.