Snowmageddon, why we don't have an outdoor Northern city Super Bowl?

I personally think it has to do with the league trying to keep the weather from being a factor in a super bowl. Remember super bowl 41? How sloppy and frustrating that was to see two good teams struggle in the rain? Weather often can inhibit a team's performance and fans want to see both teams best efforts. Think of the losing team and its fans, complaining to the cows come home about how their team lost because of the elements. Fans already do this with the refs (a factor that the league can't exactly help) just imagine the groaning and resentment if weather is allowed to be a factor.