[CanuckJim]

Denap,

I live in rural Ontario, to the north and east of Toronto, which might be a bit to the south of you. I have installed stucco dome ovens in our climate, which is probably somewhat drier than yours by the ocean. Still, we have considerable freeze-thaw cycles here, too, and I'm simply not wild about using stucco only, and I tell people just that. I would recommend a shed or gable style roof over your oven, and better yet a walled enclosure. In a cold climate, the key scary phrase is "probably not." I go a long way to get that one out of my vocabulary, for my oven and those I install.

Your mason source is on the right track.

Jim