Don't know the min temp, but ours were operated in mid teens up in Thompson, Manitoba a couple of years ago. Even had to go on the roof to push the heavy wet snow off the slide toppers so they would roll up when bringing the slide in.
Don't plan to do that again any time soon.
Michelle & Ann
2018 Chevy 3500HD Crew Cab High Country DRW, D/A, 2016 RW39MB, Dual ACs, Auto Level, Auto Sat Dish, Stack W/D, King Sleep #, 17.5" Sailuns w/Disc, MORryde IS & Pin, Comfort Ride Hitch, 5.5 Onan, Res Fridge & Induction Cook Top