The fell is prone to dense hill fog and fierce winds. A shrieking noise induced by the Helm Wind is a characteristic of the locality. It can be an inhospitable place for much of the year. In ancient times it was known as Fiends Fell and believed to be the haunt of evil spirits. St Augustine of Canterbury is said to have blessed the hill when he arrived here on his travels so it became known as Cross Fell in the Christian tradition, although it has been speculated that the fell became known as Cross Fell (cross meaning angry) because of the evil spirits.