They only go back to the D3100 model -- which I and many others Did-Not-Want because of all the bells, whistles and switches on it. We didn't want to take Videos or even have Live View, we wanted a 'C-A-M-E-R-A', period.
But one thing I'm not crazy about with any brand of Digital SLR is their 'recommended operating range temperature, 30oF to 90oF. I'd think it would work outside that range, just the battery life might be affected.
I sure didn't have to worry about that with my Nikon FE or even my Pentax Spotmatic II (both of which still work just fine). Only the possibility of the front lens element fogging up in cold weather like if you brought it outside from the house and tried taking pics right away, or have it under your cost, then try to shoot right away). I took pics wit my Nikon FE on Construction Sites in below zero weather without a problem - except I was the one freezing up :-)
All I want is a camera which does basic camera things well, don’t need the bells and whistles. I love my Sony A200 but the only way I’ll be able to replace it will be to find a good used one with a low shutter count. It’s going strong but it can’t last forever.