For early December snowfalls in Charlotte that were 10" or greater, you have to go back to December 2, 1896 when the city received 10" of snow. Monroe, NC received 12" of snow and 16" of snow fell in Chester, SC from that same snowstorm. I believe one of the largest December snowfalls in North Carolina occurred in early December 1886 when over two feet of snow fell around Asheville.