Rabbits do pretty well when the temperature drops, if they are properly sheltered. Inside, they have the human luxury of a furnace.
Even outside, the rabbits do completely fine unless the weather really turns bad and it drops way below 0*F. Make sure the hutch is sheltered from rain and snow. If the rabbit gets wet, it can't stay warm, and then there are problems.
The worst problem for rabbits, when the temperature gets to freezing, are keeping the water bottles from freezing. The nozzles freeze first, so even if your rabbit has liquid water in its bottle it might not have access to it. The water will need to be changed daily, maybe even a couple times a day. Warm water will take longer to freeze, but some people say that it can cause stomach aches. Water bottles can crack and break as the ice expands (if it's not seen to soon enough). Ice is also hard to break/melt once it's in the bottle. Some people recommend crocks (heavy rabbit bowls) to keep water in during the winter. They don't crack as the ice expands and you can bang them against stuff to break the ice.
I've never tried to provide water in a bowl, so I can't give my own opinion on that. I may need to try it though, when winter comes. This is my first winter with the outside rabbits. It did snow when Gracie was a baby, but we got her in March. I didn't notice any problems with her water bottle freezing even then.