We raised white rabbits for 10 years when I was a kid. Here are some pointers:
1. Rabbits can take the cold very very well, but only if they are kept totally dry, and out of the wind, and have a box that they can go into with a little straw, or even a heavy cotton towel.
2. Do not face the front of your cages due south. If the sun pours in there during the summer, and the rabbits can't get out of the sun, then they will very quickly die of heat stroke. Always make sure that at least half of their cage space is shaded at all times.
3. We use to go out to feed and water the rabbits in the morning during the winter. We carried out plastic milk jugs, full of extremely hot tap water. Yes, the water in their bowls was frozen. So, we would pour a little hot water on top, then turn the bowl over and slam it down. The frozen water would fall out in one chunk. Then, we would refill the bowl with the hot water. It would stay unfrozen for a couple of hours, and the rabbits would drink it during this period with no problem.
4. We mostly raised the white New Zeland rabbits. We also had a few of the black and white Dutch rabbits. But, we found out that the males were extremely mean, and if they were frustrated during a mating time, they would get viscious. One of them bit down hard on the back of my little brother's hand when he was putting a water bowl into the cage, and shook back and forth like a shark, tearing the back of my brother's hand open. It took 8 stiches to close it up, and it left a ragged scar.
5 We found out that if a female rabbit killed one or more of her first litter (they actually chew them to death), then she is very likely to repeat it for future litters and aren't worth breeding. On the other hand, we had a few females that had as many as 10 litters, and never harmed a single one. You have to study your rabbits, and look for the large and friendly ones.
6. Always have a salt lick in the cage.
7. If you have baby rabbits (very young) in the cage, then they can't be on wire. Racoons will crawl up underneath the cage, and grab their legs through the wire, and actually pull them off or eat them off. This is a very very horrible scene, so make sure it doesn't happen. When we had baby rabbits in the cage, we always set small steel traps underneath the cage at night, with some straw sprinkled on them. We caught racoons and bobcats.