For Christmas to be considered 'white', there must be snow on the ground or falling from the sky. This is because white is often associated with snow and a winter wonderland setting, which is a traditional image of Christmas in many cultures. In areas with warmer climates, some may use artificial snow or decorations to create a 'white Christmas' atmosphere. Additionally, some may consider Christmas to be 'white' if they are spending it with loved ones, as 'white Christmas' is also a term used to describe a joyful and celebratory holiday season.