Is it a good idea to the Vienna loop in Dec'09

Is it a good idea to the Vienna loop in Dec'09

Planning to be a there this Dec; take a rental car to do the trip, with a family of 3, including a 8 year old child. Will it be too cold & will roads be safe to drive, given snow & the elements.. Any advise from someone who may have done this or someone living in the area will be greatfully appreciated.. Many thanks !

Question about The Vienna Loop

The shorter days and extra people on the roads in December make it not the best time for a driving holiday...