Had a building with 18 green carrier weather makers with that awful giant panel that warps and fits rough and you need to zap self tapers into the panel so "snow" doesn't get in.
It is designed to be outside. We have ALOT of war time homes in my area. A lot of people have RTU beside their house on the ground and I have never seen snow inside panel. That's with snow drifts blocking the venter motor .