It's best to keep your rabbit between 63 degrees F (17 degrees C) and 81 degrees F (27 degrees C).
Rabbits do best when they're kept at the same temperatures that you generally find comfortable. Leaving a rabbit in temperatures outside the range I've stated risks making them miserable and can cut down their life span considerably.
If a rabbit is outside, be sure to give them shade. They can likely do fine at temperatures a bit higher than 27 F as long as they have plenty of water and shade. However, if they're exposed to direct sunlight for too long, you're bound to have issues. Keep in mind that a rabbit warren's temperature is regulated by the fact that it's underground. Rabbits are communal; in a warren they will help each other to stay warm if need be.
Consult this PDF for more detailed information:
http://www.blitter.com/~nebulous/otherworld/ThingsToKnowAboutRabbits.pdf
Rabbits do best when they're kept at the same temperatures that you generally find comfortable. Leaving a rabbit in temperatures outside the range I've stated risks making them miserable and can cut down their life span considerably.
If a rabbit is outside, be sure to give them shade. They can likely do fine at temperatures a bit higher than 27 F as long as they have plenty of water and shade. However, if they're exposed to direct sunlight for too long, you're bound to have issues. Keep in mind that a rabbit warren's temperature is regulated by the fact that it's underground. Rabbits are communal; in a warren they will help each other to stay warm if need be.
Consult this PDF for more detailed information:
http://www.blitter.com/~nebulous/otherworld/ThingsToKnowAboutRabbits.pdf
