All floor seats, and low-number sections (1-37 and 100s) will not be covered and should be completely avoided. As those are the closest seats to the stage, you'll want to focus your search on the 200 level sections that are under the roof and offer a good angle towards the stage.
In most 200 level sections, all rows are under cover but you'll also battle the support beams for an unobstructed view. Choose a low-number 200 level section for the best overall experience. Please see the ticket suggestions below and my comments.