It doesn't. It's the Days of Idiocy, a state holiday where the majority of the population forgets how to drive and runs around like its the end of the world because there's ice on the ground. The rest of the period that might be called Winter elsewhere is either Wet or Grey, two regional terms that are not mutually exclusive.

Mind you, what we got on Christmas Eve, while it was only 18 hours worth, was pretty wintery. And speaking as the uncle to a three-year-old who had never seen snow, it was awesome.