The guns will likely work, but wear gloves to prevent your skin from freezing to the frame, or on composite framed guns, the slide.
If the temperature is low enough that the lubrication on my firearm is affecting the operation of it, I'll be wearing gloves, and not a pair of skin tight tacti-kewls. Today's technology is allowing for warmer and more gun-user friendly gloves to be worn, however, I find it very distracting to attempt to operate a retention holster, and once drawn, confidently access the trigger due to the trigger guard restrictions with gloves on that are heavy enough to protect me from sub-zero elements. In my youth, I fox and coyote hunted in sub-zero temps. I always dropped my right glove when I took a firing position, regardless of ambient or rifle steel temps, and still shoot that way today. IF I need to use that defensive weapon in sub-zero weather, I have larger problems to focus on than cold fingers.
In my high school years, I thought nothing of wearing little more than a jean jacket all winter, with a hoodie under it when it got real bad. Now, I can't ignore the cold as I used to, and wear 3/4 length coats when needed, [I won't apologize for wanting to have a warm tookus]. That makes open carry a bit more challenging, and open carry gets regulated to the days I wear a waist length jacket, which fortunately is more often than naught.
ETA: I use DuPont Teflon Non-Stick Dry-Film Lubricant on moving parts when carrying year-round, grease and oil when range firing. I use a non-abrasive car wax on all the externals to ward off rust, dust, fingerprints, salts, etc.
