The UK's climate and environment

The UK sits between about 50 and 61 degrees north — the same latitude band as Labrador, which has a subarctic climate. The difference is the North Atlantic Drift, an extension of the Gulf Stream carrying warm water north-east across the Atlantic, which keeps British winters far milder than the latitude would suggest.

The country also sits directly in the path of the North Atlantic jet stream and the succession of low-pressure systems it steers. That produces the defining characteristic: changeability. Air masses arrive from the Atlantic, the Arctic, continental Europe and occasionally the Azores, and which one is overhead can change within hours.

Rainfall is heaviest in the west and north, where Atlantic air meets high ground and drops its moisture. Parts of the western Highlands and Snowdonia receive over 3,000 millimetres a year. The east and south-east are far drier — parts of Essex and Cambridgeshire receive under 600 millimetres, less than Jerusalem, which surprises most people.

Snow is unusual and disruptive when it arrives, because infrastructure is not built for it. Scotland and high ground see reliable winter snow; London may go years without a settled fall.

Flooding is the dominant natural hazard by a wide margin. Around one in six properties in England is at risk from flooding from rivers, the sea or surface water. Surface water flooding — where rainfall overwhelms drainage rather than a river bursting — affects more properties than river flooding and is far less well understood by householders.

Flood risk is highly localised and often invisible from looking at a property. The Environment Agency, Natural Resources Wales, SEPA and the Northern Ireland Department for Infrastructure all publish free flood risk maps by postcode, and checking one before buying or renting is genuinely worth the five minutes.

Storms are named jointly by the Met Office, Met Éireann and the Dutch KNMI, and warnings run on a yellow, amber and red system. Red warnings are rare and mean a danger to life.

Heat is a newer risk. The 2022 heatwave that produced the first recorded 40 °C reading was associated with thousands of excess deaths, concentrated among older people in poorly ventilated housing. British housing stock is designed to retain heat, which is an advantage for eight months of the year and a serious problem for the other four.

Drought and hosepipe bans occur in dry summers, particularly in the south-east, which despite the country's reputation is one of the more water-stressed regions in northern Europe on a per-person basis.

The Climate Change Act 2008 made the UK the first major economy to set a legally binding long-term emissions target, later amended to net zero by 2050. Progress is monitored by the independent Climate Change Committee, which reports to Parliament and whose assessments are frequently critical of government delivery.

Territorial emissions have fallen by more than half since 1990, the largest reduction of any G7 economy. Almost all of that came from the electricity sector: coal generation ended entirely in September 2024 when the last coal-fired power station closed, and offshore wind grew from nothing to one of the largest fleets in the world.

The unresolved parts are harder. Home heating, dominated by gas boilers in a housing stock among the least energy-efficient in western Europe, and surface transport, still overwhelmingly petrol and diesel, together account for a large share of remaining emissions and have proved far more politically difficult than decarbonising the grid.

Territorial emissions also exclude the emissions embedded in imported goods. Consumption-based emissions have fallen more slowly than territorial ones, and the gap is a legitimate criticism of headline progress figures.

The UK is one of the most nature-depleted countries in the world by several measures. The State of Nature reports, produced by a partnership of conservation organisations, have consistently found long-term declines across a majority of monitored species, driven principally by agricultural intensification, habitat loss and, latterly, climate change.

Around 70 per cent of UK land is agricultural and roughly 13 per cent is woodland — low by European standards, though rising slowly from a historic low of about 5 per cent a century ago.

There are 15 national parks across the four nations, along with National Landscapes (formerly Areas of Outstanding Natural Beauty), Sites of Special Scientific Interest and marine protected areas. Unlike national parks in many countries, British ones are largely privately owned, lived-in working landscapes rather than wilderness reserves.

Access rights differ sharply. Scotland has a statutory right of responsible access to most land and inland water under the Land Reform (Scotland) Act 2003 — one of the most generous access regimes in Europe. England and Wales have a much narrower right, limited to public rights of way and mapped open access land under the Countryside and Rights of Way Act 2000. Northern Ireland has the most restricted access of the four.