Keeping trees dry post repot

I was using a umbrella to keep the rain off my freshly repoted trees and the wind blew it over and dumped out a couple of the trees. Well I don’t want to repeat that so what does everyone else do to keep them dry until they need there second watering. I understand heated green house would be best I think but I don’t have one of those.

I appreciate the ingenuity! I too am in a similar pickle with a limited repot situation. I am looking into making something similar parallel in design to what @NEBeech has. A wooden frame shielded by a plastic sheet. It’s not glorious but it can reduce the wind and rain’s impact.