Why is the Audi e-Tron's range estimated to decrease in cold weather?

I've heard that the range of electric vehicles can be affected by cold weather, but why is this specifically true for the Audi e-Tron? What factors contribute to the decrease in range and is there anything I can do to mitigate it?

The primary reason for decreased range in cold weather is due to the increased energy required to warm the battery and cabin. This is true for all electric vehicles, not just the Audi e-Tron.