Ireland's Land and Climate: The Emerald Isle's Temperate Oceanic Character

Ireland's nickname, the Emerald Isle, comes from its pervasive greenness—sustained by a temperate oceanic climate (Köppen Cfb) driven by the Atlantic and Gulf Stream.

Climate

• Mild winters: Jan avg 4–7°C (39–45°F). Snow rare at low elevations.
• Cool summers: Jul avg 14–16°C (57–61°F). Heatwaves >25°C are brief.
• Rainfall: 750–1,270 mm/year (west > east). Frequent, light, year-round. "Soft day" = misty rain.
• Sunshine: 1,100–1,400 hrs/year (SE coast sunniest).
• Wind: Prevailing SW; storms frequent in winter.

Terrain & Landscapes

• Central Lowlands: Rolling limestone plains, raised bogs (Bog of Allen), lakes (Lough Neagh, Lough Corrib).
• Mountain Rims: MacGillycuddy's Reeks (Carrauntoohil 1,038 m), Wicklow, Donegal, Galtees. Glacial valleys, corries.
• Coastline: 3,175 km—cliffs (Moher, Slieve League), beaches, sea stacks, drowned valleys (rias/fjards).
• Rivers: Shannon (360 km, longest), Liffey, Lee, Boyne, Erne. Slow, meandering, lake-studded.
• Boglands: Blanket bogs (west/mountains), raised bogs (midlands)—carbon stores, unique flora (sundews, sphagnum).

Ecological Outcome

Long growing season, no extreme cold/heat → lush grass → dairy/beef dominance. Ancient woodlands reduced to <2%; hedgerows now key habitat.