The range of temperatures succulents can tolerate is quite impressive, but not all species can handle the same temperatures. There are cold hardy succulents like Sempervivum, and very tender succulents like Echeveria.
The key to keeping succulents happy is watering only when the soil is dry and paying attention to the leaves. Your succulents will tell you what they need. You just have to know what to look for.
Succulent Sunburn and Too Much Heat