Northern Ireland’s climate is temperate and maritime; most of its weather comes from the southwest in a series of low-pressure systems bringing the rain and clouds that often lend character to the landscape. Because Northern Ireland is near the central track of such lows, it often experiences high winds. In the north and on the east coast, particularly, severe westerly gales are common. Above the 800-foot (245-metre) level, distorted trees and windbreaks testify to the severity of the weather. Annual rainfall decreases from west to east, although the hills accentuate the amount to some 80 inches (2,000 mm) in parts of the west, and there is as little as 32.5 inches (825 mm) at Lough Neagh and the extreme southeast. A relatively dry spring gives way to a wet summer and a wetter winter. Daily conditions generally are highly changeable, but there are no extremes of heat and cold. The region is exposed to the ameliorating effects of the North Atlantic Current, a northeastward extension of the Gulf Stream. Average January temperatures vary from 38 °F (3.3 °C) on the north coast to 35 °F (1.7 °C) in the east; in July temperatures of 65 °F (18.3 °C) are common. In late spring and early summer the east has slightly lower temperatures accompanied by coastal fog. These mild and humid climatic conditions have, in sum, made Northern Ireland a green country in all seasons.

Plant and animal life

The general features of the vegetation of Northern Ireland are similar to those in the northwest of Britain. The human imprint is heavy on the landscape and is particularly evident in the absence of trees. Most of the land has been plowed, drained, and cultivated for centuries. Above the limit of cultivation, rough pastures are grazed extensively, and beyond them lies a zone of mountain vegetation. Only about 5 percent of the land is now under forest, and most of this has been planted by the state. Young trees in these plantations are economically unimportant, but locally they help to diversify the landscape.

The fauna of Northern Ireland is not very different from that of Great Britain. There are, however, fewer species of mammals and birds. Only two mammals—the Irish stoat and the Irish hare—and three species of birds are exclusively Irish. The region is rich in fish, particularly pike, perch, trout, and salmon; the first is the only fish introduced in historic times.

As a result of ongoing concern with conservation, there are some 40 nature reserves and several bird sanctuaries controlled by the Ulster Wildlife Trust and by the Department of the Environment.

Ethnic groups and languages

The cultural differences that underlie many of Northern Ireland’s contemporary social problems have a long and troubled history. The region has had lasting links with parts of western Scotland, strengthened by constant population movements. After the Tudor invasions and particularly after the forced settlements, or plantations, of the early 17th century, English and Scottish elements were further differentiated from the native Irish by their Protestant faith. Two distinct and often antagonistic groupings—the indigenous Roman Catholic Irish and the immigrant Protestant English and Scots—date from that period, and they have played a significant role in molding Northern Ireland’s development. The settlers dominated County Antrim and northern Down, controlled the Lagan corridor toward Armagh, and also formed powerful minorities elsewhere.

This situation contributed to the decline of spoken Irish (Gaelic), and it is reflected in the contemporary distribution of religions. The accents with which Northern Irish people speak English are regionally distinctive. The northeastern dialect, dominating the historic counties of Antrim and Londonderry and parts of Down, is an offshoot of central Scottish dialect. The remainder of the area, including the Lagan valley, has accents derived from England, more particularly from Cheshire, Merseyside, Greater Manchester, and southern Lancashire, as well as the West Country counties of Gloucestershire, Avon, Somerset, and Devon. The towns show more of a mixture and an overlay of standard English.

Northern Ireland’s political divisions are partly reflected through language. Although English is near-universally spoken by everyone in the six counties, Irish also is spoken by a small but significant and growing proportion of the population and is an important element of the cultural identity for many northern nationalists (Roman Catholics who support unification with Ireland)—even those with limited knowledge of the language. Unionists (Protestants who support Northern Ireland’s status as a constituent element of the United Kingdom), on the other hand, tend to distrust and dismiss Irish as a cultural expression of political divisiveness.