30°F is not cold, it's barely even freezing.

I have yet to test my Bradley in such warm weather.
FWIW, the BDS4 did well at 25°F on my back porch. We'll see how it does today. It's now 20°F and will only get colder throughout the weekend, but it was able to get up to temperature, so...
I do put a cover over it to keep the snow off it when not in use. It's a lot cheaper than buying a shed.
To be fair, I have not tested it in strong winds yet, so if you have strong winds you may very well need an enclosure at 30°F.