Christmas to be declared with onset of snow

In the UK, a white Christmas is declared if a snowflake falls on the roof of the Met Office, while in the US there has to be a snow depth of at least 1" on Christmas morning. This leaves us with very few white Christmases, even though snow invariable falls in winter.

If we reverse this process and declare Christmas immediately on the onset of snow, we could celebrate bountiful white Christmases almost every year, with sledging, snowmen et al on the day (max number of Christmases: 1 per 12 months, unless rolled over from previous year).

However, there are other advantages to making Christmas a moveable holiday; Unproductive 'snow days' and commuting disruption would be reduced, since everyone would have the day off anyway, while old- fashioned snowless Christmases would be just a normal working day. The element of surprise would make the yule season more exciting for many, while the problem of Christmas 'getting earlier every year' and shopping chaos would be eliminated, with present-buying vigilantly spread across the year. Fans of Christmas can also enjoy 'follow the weather' and enjoy festivities in many different countries throughout the year, while the explanation of how Father Christmas gets round to all the houses in the world becomes more credible.