From what I have learned with some of my succulents outdoors, cold okay, as long as no rain, or on the off chance it does rain, media has to be really fast draining so the roots do not rot. I usually have my succulents also in shallow containers. I really like your set-up media looks good. In your collection, I think I see an aloe-gasteria hybrid there, that one, pouts big time, but will recover, but the damaged tips really turns ugly brown. Protect your lithops, I would move that indoors, it easily goes mush, needs to be dry.
