There is such a mess at the end of the game that it will be easy to declare a tie. Save the newspapers afterward for recycling. This can truly be a blizzard. Especially if enough paper gets into the air at any one time. Can also use the comparison of the stack of newspaper when all neatly folded as the water equivalent for the snow.
Snow is less dense and the crystal structure takes up more space than liquid water.
The waded paper takes up more space than the folded paper. Give each team a large block of ice. Each block is weighed in and then each team has 10 minutes to melt as much as possible. No water, fire, crushing, chipping, micro waving allowed. Weigh each block of ice again.