A woman makes a shopping list in front of a department store's Christmas window display.

U.S. retailers posted much weaker-than-expected sales for November, as shoppers focused only on big bargains at the start of the key holiday selling season. Charles Grom, broadline retail analyst at JPMorgan, shared his industry outlook.

“I’m not trying to look at the glass too half-full: the numbers today weren’t good,” Grom told CNBC.