I think leaf shutter rangefinder cameras work better in low temps than most others. The one thing that has to be watched out for is the lubricant in the rangefinder levers getting stiff, thus the mirror may not turn correctly. But that's usually an issue on something that a "repair person" has over lubed, and can even happen in warmer temps if it's cheap lube and dries out.
I had a little Paxette that worked fine down to 20°F, and was easy to handle with gloves on. But it did not have a rangefinder, so you wouldn't like it, Tim. I've used other cameras in cold weather, and as long as the batteries were warm enough they functioned well. But a camera that will work with or without batteries is some thing like the Nikon F which only needs power for the meter, and will operate just fine without it. I try to use the thinnest gloves I can find that will still keep my fingers functioning, as they start to shrivel and stiffen below 40°F. I finally wore out the pair I was using this past winter, so will be looking for some new ones next season.
PF