Pedestrians crossing the street on a snowy day.gettyWeather is a perennial wildcard in retail performance. It’s frequently blamed for poor quarterly results – like last fall, when Gap, Target, Shoe Carnival and Columbia Sportswear credited unseasonably warm temperatures for weak apparel and footwear sales. Yet skeptics could argue that weather is a convenient scapegoat. The U.S. spans diverse weather conditions and with online shopping reducing the need for shoppers to venture outdoors, the weather’s impact ...