If the garden is not a full time endeavor, then this may be an insurmountable setback. Each location will have different wind considerations just as sunlight varies from place to place. Fortunately, many of the objects in the list of planters are also excellent wind guards and sunshades if placed strategically. But you should also make sure that all plants and garden supplies are secure and will not be blown off a ledge, wall or other high structure. Of course, these are common sense issues, although easily overlooked.
Security is important for the urban garden.
Aside from urban wildlife such as mice, opossums and raccoons, it is an unfortunate truth that vandalism and theft do occur. Consequently, you need to consider who has access to the garden site if it is not in a totally secure location. Chances are, if you have access to a rooftop, the neighbors will also. One would hope that they can trust their neighbors, but a garden located at street level is much more likely to be exposed to nefarious characters. This is especially true if the garden is part of a community garden project or simply located in public space.