Wind models need good penetration, decent power & minimal dihedral. The lack of dihedral is not a flight requirement, but rather, a ground handling requirement. High wing loading helps, but is not really necessary. My three examples include a Blue Movie SPAD 46 (forground), a much modified Florio Flyer 60 (background), and a Hobbico Superstar 46 hot-rod. They vary from fairly high wing-loading (SPAD) to very low wing loading (Superstar). The real trick is the take-offs & landings. If the plane blows over backward on the ground, it is too windy. Once airborn, the wind speed doesn't matter at all, unless the model can't progress against it -- that would mean ~ 75 MPH for the Superstar & 85MPH for the Florio & Blue Movie -- which is ridiculous of course. Essentially, the limit is established by the ability to safely get airborn & back down again.

I fly the Superstar in 20-25 MPH winds without difficulty, wherein it will do near-vertical take-offs & landings. The Florio & Blue Movie can handle 30+ MPH without serious problems.