Based on the climate data from 1970-2000, this graphic from the National Climatic Data Center shows the odds of having a "White Christmas" (they define it as having at least 1 inch of snow on the ground). For most of the Tennessee Valley, the probability is less than 5%, though it jumps to 5-10% in parts of Franklin and Lincoln Counties in Tennessee. Click the graphic to enlarge.

Across the Tennessee Valley, the odds are pretty slim, but it has been known to happen! (Check out the latest forecast to see if we might beat the odds.)

Huntsville

According to the climate records, Huntsville has reported at least a trace of snow on December 25th 8 times since 1894, and 12 times on December 24th:

However, it didn't actually accumulate to much! Only once has 0.5 inch or more of snow been reported on the ground on Christmas morning, and that was in 1963, when one inch was reported.

Muscle Shoals

It looks a little greener in the Shoals, where at least a trace of snow was reported 8 times on December 25th since 1890 (but never more than a trace), and just 6 times on the 24th:

However, snow from earlier in the week in 1963 kept 3 inches of snow on the ground, and one inch on the ground in 1989 and 1929.

Of course, the "mother of all snowstorms" in the Tennessee Valley actually occurred on New Year's Eve and Day of 1963-1964. Huntsville reported 17.1 inches of snow over the 2-day period, while Muscle Shoals received 9.6 inches. ("Dreaming of a White New Year's" just doesn't sound the same...)

Click on the links below to see a couple of images from this event.
Image 1
Image 2