Geography of Sheffield county, from bituminous (ideal for domestic heating) to "Thick Coal", of a semi-anthracitic quality, appropriate for use in iron-smelting and in engine furnaces. Associated with the Upper Coal Measures were valuable iron ore deposits, occurring in the form of nodules. Large quantities of locally occurring fireclay were also exploited, as well as ganister (a clay used to make refractory furnace linings). The city of Sheffield derives its name from the River Sheaf which Until the 17th century was written as "Scheth" or "Sheath". Sidney Oldall Addy equates the origins of this word with the Old English "shed" (as in "water-shed")
Sheffield part of which lies within Brighton and Hove. Like the rest of the United Kingdom, the climate in Sheffield is generally temperate. The Pennines to the west of the city can create a cool, gloomy and wet environment, but they also provide shelter from the prevailing westerly winds, casting a "rain shadow" across the area. Between 1971 and 2000 Sheffield averaged of rain per year; December was the wettest month with and July the driest with . July was also the hottest month, with an average maximum temperature of . The average minimum temperature in January and February was ,