Officers were called to Church Street at about 1am after two men and a woman approached a man in the street.
One of the men then punched the victim in his head, causing a fracture to his jaw in the assault on January 28.
North Yorkshire Police today (Monday) issued a renewed appeal for witnesses to the offence.
The suspect is described as white, about 23 years-old, small to medium build and about 5ft 6ins tall with dark, short hair.
He was wearing a black jumper and black bottoms.
Anyone with information is asked to call police on 101, quoting reference number 12180016285.