Local News Copter4 Images Of Sub-Zero Denver December 5, 2013 / 8:47 AM MST / CBS News (credit: CBS) Copter4 Flew Over Denver On The Morning Of Dec. 5 During Sub-Zero Temps (credit: CBS) Copter4 Flew Over Denver On The Morning Of Dec. 5 During Sub-Zero Temps (credit: CBS) Copter4 Flew Over Denver On The Morning Of Dec. 5 During Sub-Zero Temps (credit: CBS) Copter4 Flew Over Denver On The Morning Of Dec. 5 During Sub-Zero Temps (credit: CBS) Copter4 Flew Over Denver On The Morning Of Dec. 5 During Sub-Zero Temps (credit: CBS) Copter4 Flew Over Denver On The Morning Of Dec. 5 During Sub-Zero Temps (credit: CBS) Copter4 Flew Over Denver On The Morning Of Dec. 5 During Sub-Zero Temps (credit: CBS) Copter4 Flew Over Denver On The Morning Of Dec. 5 During Sub-Zero Temps (credit: CBS) Copter4 Flew Over Denver On The Morning Of Dec. 5 During Sub-Zero Temps (credit: CBS) Copter4 Flew Over Denver On The Morning Of Dec. 5 During Sub-Zero Temps Rocky Mountain Metropolitan Airport in Broomfield (credit: CBS) Copter4 Flew Over Denver On The Morning Of Dec. 5 During Sub-Zero Temps (credit: CBS)