Demott Sheila asks, "How many times has Knoxville had a heavy snowfall on Christmas Day?" And by heavy, she means more than five inches.
For the Knoxville area, it's been a while. The last time we have had more than five inches of snow in Knoxville was 1969. That year, we had seven inches.
The time before that? 1929! We had six inches.
The last time we had a white Christmas here in the East Tennessee region was back in 2010. Several higher elevation counties saw more than five inches.