There is no set temperature range for placing your hive. The bees will keep the inside of their hive between 93*F and 95*F at all times regardless of the outside temperature. Since it get hot there just make sure they have plenty of fresh water close by to help reduce the amount of time they spend gathering water to cool the hive in the summer. I'd go with the spot between the house and garage in your case.
The article on location will be published Wednesday and will give you a bit more information than what I have posted here.
