How much snow does it take to equal an inch of rain?

The most commonly used ratio is that 10 inches of melted snow is equivalent 1 inch of rain. However, according to the National Snow and Ice Data Center, this ratio is a myth for much of the USA. The figure can actually vary quite widely, depending on whether the snow is dry, fluffy powder (when 100 inches of snow would melt down to 1 inch of rain) or very heavy and wet (with a ratio of 3 to 1