Winter's cold temperatures don't bother French angoras; in fact, they enjoy the cooler weather. However, if temperatures drop below freezing, your rabbits' water bottles or crocks may freeze, leaving them without water. (Heated water bottles are available but I have never tried them, so I cannot comment on them.) Depending on how low the temperatures dip, we may fill bottles morning, noon, and night with warm water to ensure their supply is always available.
In addition, it is important to have a good supply of feed at all times, but especially in winter. We live on the eastern side of Donner Pass in the Sierra Nevadas, and frequently semi trucks can't make it over the pass. We were sweating bullets a few times last year when trucks didn't make their scheduled deliveries. This year, Lydia and I each bought enough feed to last through February. Having a good supply of hay is also an important consideration.
Here's hoping we have lots of snow this winter!