With the weight distribution plus the modern traction control you should be fine in most scenarios.It is. Could not be happier thus far. Our only complaint (which is about our decision and not about the Tesla) is that we could have gotten a Y instead of the 3.
We live in Minneapolis. Was tempted to get the all wheel drive. We opted for the RWD with snow tires - counting on physics (weight centered under the car instead of front or back) to be our friend. AWD would have been a complete waste of money, in my opinion - even in this climate.