One of the things uprights do well is, they work with standard heavy-weather clothing. Before my last move, I commuted 12 month a year on my hybrid, regardless of temp or if it was snowing, raining, blowing, etc. Proper clothing kept me dry and warm whenever the weather was Bad. I commuted in 100F, and I commuted in 0F. Uprights are just a poor platform for full fairings. By necessity, everything that needs to be protected is at the top, which maximizes crosswind issues. If you close it on top, you not only exacerbate the problem, you eliminate the possibility of standing on hills, and -presto!- you climb just like a recumbent. Or maybe worse, since you don't get the leverage a bent rider would.