It's starting to become a tradition in the UK every winter that when it starts snow everyone tweets where they are and how heavy the snowfall is, with the tag #uksnow, a handy hashtag that can be scraped for data and put to good use. Such as the UK Snow application for Windows Phone!
Taking that data, and showing it on the map of the country, you'll be able to see how the white stuff covers the country. Naturally there's no snow visible in the app just now, but that weather is sure to come in January, so load up the app and be prepared, for scenes like this!