Smoked a pork shoulder last Sunday during a the snow storm outside temp was 3-5 deg F, Used a masterbuilt 7 in 1 and had no problem maintaining 225-240 deg. Took about 9 hours in the cooker and then let it rest for 2 hours came out great made pulled pork sandwiches with it. Very happy with this smoker.
Ah, you folks who put the BBQ and Smoker away just because there is snow and cold temperature, make me sick. I BBQ and smoke all year long and I live in a cold climate area. My smoker and BBQ sit about 30 feet out the back door, the BBQ under a Lean too I have made, it back to shed my MES smoker sits. I have hydro to shed, a heater I can put in it. No excuses, just good food all year around.
That 30 feet, I keep it cleaned out, and from the pad that BBQ sits on to the shed door also.