I don't believe they should be. From the NFL Rule Book ...
The severe cold weather that is predicted in Green Bay is a threat to the health and safety of those working in the stadium, the fans and the players.
IMO, the game should be postponed and/or moved to another location.
The NFL is recklessly exposing people to those severe conditions and the game will be besmirched if the health of people, the performance of the players and the outcome of the game if affected by the cold.
Emergencies -- Policy
The National Football League requires all League personnel, including game officials, League office employees, players, coaches, and other club employees to use best effort to see that each game -- preseason, regular season, and postseason -- is played to its conclusion. The League recognizes, however, that emergencies may arise that make a games completion impossible or inadvisable. Such circumstances may include, but are not limited to, severely inclement weather, natural or manmade disaster, power failure, and spectator interference. Games should be suspended, cancelled, postponed, or terminated when circumstances exist such that comencement or continuation of play would pose a threat to the safety of participants or spectators.
http://www.nfl.com/rulebook/emergencies
The severe cold weather that is predicted in Green Bay is a threat to the health and safety of those working in the stadium, the fans and the players.
IMO, the game should be postponed and/or moved to another location.
The NFL is recklessly exposing people to those severe conditions and the game will be besmirched if the health of people, the performance of the players and the outcome of the game if affected by the cold.