I should have posted in the other smoker thread, but....yesterday the temperature was around 50F with fairly calm wind, so the smoker didn't have a problem building and maintaining high temps. I used the smoker only a few times this winter because with temps ~20F and below, it was sometimes difficult to keep 200-250F with winter winds even with it covered with a welding blanket.
I bought a large welding blanket from Harbor Freight for $30 which made a heavy double layer around the Smokey Mountain Smoker. The blanket isn't ideal because it's doesn't hang easily over the tall bullet smoker, and still maintain open access to the feed door and the top and bottom vents. I may need to do some creative modification. Now wish I'd bought a dedicated heat blanket for it.