Office for National Statistics, compared to 82% for England as a whole. Natural resources Peat is found in thick, plentiful layers across the Pennines and Scottish Borders, and there are many large coalfields, including the Great Northern, Lancashire and South Yorkshire Coalfields. Millstone grit, a distinctive coarse-grained rock used to make millstones, is widespread in the Pennines, and the variety of other rock types is reflected in the architecture of the region, such as the bright red sandstone seen in buildings in Chester, the cream-buff Yorkstone and the distinctive purple Doddington sandstone. These sandstones also mean that apart from the east coast, most of Northern England has very soft water, and this has influenced not just industry, but even the blends of tea enjoyed in the region. Rich deposits of iron ore are found in Cumbria and the North East, and fluorspar and baryte are also plentiful in northern parts of the Pennines. Salt mining in Cheshire has a long history, and both remaining rock salt mines in Great Britain are in the North: Winsford Mine in Cheshire and Boulby Mine in North Yorkshire, which also produces half of the UK's potash. Climate Northern England has a cool, wet oceanic climate with small areas of subpolar oceanic climate in the uplands. Averaged across the entire region, Northern England is cooler, wetter and cloudier than England as a whole, and contains both England's coldest point (Cross Fell) and its rainiest point (Seathwaite Fell). Its temperature range and sunshine duration is similar to the UK average and it sees substantially less rainfall than Scotland or Wales. These averages disguise considerable variation across the region, due chiefly to the upland regions and adjacent seas. The prevailing winds across the British Isles are westerlies bringing moisture from the Atlantic Ocean; this means that the west coast frequently receives strong winds and heavy rainfall while the east coast lies in a rain shadow behind the Pennines. As a result, Teesside and the Northumbrian coast are the driest regions in the North, with around of rain per year, while parts of the Lake District receive over . Lowland regions in the more southern parts of Northern England such as Cheshire and South Yorkshire are the warmest, with average maximum July temperatures of over , while the highest points in the Pennines and Lake District reach only . The area has a reputation for cloud and fog