Cross Fell, Great Dun Fell and Little Dun Fell form a block of high terrain which is all over in altitude. This is the largest block of high ground in England and tends to retain snow-cover longer than neighbouring areas. Snow can be found in gullies on the north side of Cross Fell as late as May in most years. In some years, lying snow has been known to persist until July and fresh snowfall in June (mid-summer in the Northern Hemisphere) is common.