Dome!
Manning doesnt live in the dome. He still has to live in a cold city most of the year. Of all of points you can make about Manning's options, you want to play the weather card? I think that is the least of his concerns. Floridians tend to overrate the weather here because the cold weather feels sooooo cold to us, but as someone who lived in PA for 8 years, I will tell you the people up north arent bothered by the cold. In fact, many actually like the cold. Manning has lived and played in cold weather his whole life, and I doubt its a big concern of his.