Geology, Geography and Climate
The Hebrides have a diverse geology ranging in age from Precambrian strata that are amongst the oldest rocks in Europe to Paleogene igneous intrusions.
The Hebrides can be divided into two main groups, separated from one another by The Minch to the north and the Sea of the Hebrides to the south. The Inner Hebrides lie closer to mainland Scotland and include Islay, Jura, Skye, Mull, Raasay, Staffa and the Small Isles. There are 36 inhabited islands in this group. The Outer Hebrides are a chain of more than 100 islands and small skerries located about 70 kilometres (43 mi) west of mainland Scotland. There are 15 inhabited islands in this archipelago. The main islands include Barra, Benbecula, Berneray, Harris, Lewis, North Uist, South Uist, and St Kilda. In total, the islands have an area of approximately 7,200 square kilometres (2,800 sq mi) and a population of 44,759.
A complication is that there are various descriptions of the scope of the Hebrides. The Collins Encyclopedia of Scotland describes the Inner Hebrides as lying "east of The Minch", which would include any and all offshore islands. There are various islands that lie in the sea lochs such as Eilean Bàn and Eilean Donan that might not ordinarily be described as "Hebridean" but no formal definitions exist.
In the past the Outer Hebrides were often referred to as the Long Isle (Scottish Gaelic: An t-Eilean Fada). Today, they are also known as the Western Isles although this phrase can also be used to refer to the Hebrides in general.
The Hebrides have a cool temperate climate that is remarkably mild and steady for such a northerly latitude, due to the influence of the Gulf Stream. In the Outer Hebrides the average temperature for the year is 6°C (44°F) in January and 14°C (57°F) in summer. The average annual rainfall in Lewis is 1,100 millimetres (43 in) and sunshine hours range from 1,100 - 1,200 per annum. The summer days are relatively long and May to August is the driest period.
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