Did you see the Winterwatch BBC TV programme which repeated a 50 year old documentary on “The great freeze of 1963”. Well worth viewing before it vanishes again from the iplayer at the weekend. http://www.bbc.co.uk/iplayer/episode/b01q9d86/Winterwatch_1963_The_Big_Freeze
You might also be interested in a posting I made on 12/12/2011. Fine links to the Snow Business Business and some Victorian guidance on sliding/snowballing!