As well as some festive activities, this past week also saw the start of winter. I know the freezing temperatures of the past few weeks were just autumn; the worst is yet to come.
The debate on when winter starts has been knocking around for ages, with everyone except BBC weathermen conceding that winter starts at the Winter Solstice on 21 December. The Beeb in the wisdom (bless them) think that winter is December, January and February. The rest of the northern hemisphere think that its 21 December to 20 March.
Wikipedia provides a useful guide.