For those planning to cook the Christmas dinner on the Traeger, winds might be a big a problem as cold temperatures. Then if you live in an are likely to get snow, unless your outdoor kitchen area is covered, snow landing on the lid of the cooker will sap a lot of heat from the cook. The phase change needed to melt snow is far greater than just cold air.
Because I live in the Chicago area where the temperatures will range between minus 4 and 8 degrees F and the winds will be 20 mph, I have decided not to try the Traeger this Christmas. My deck and grill will be covered in several inches of snow.