This mini-lesson covers Eduqas Theme 2 — Key Idea 2.3 Weather and Climate: why the UK climate is mild and wet and why it varies from place to place, how global atmospheric circulation creates wet and dry zones, how high and low pressure systems give us our day-to-day weather, how to read a synoptic (weather) chart, and two contrasting extreme weather events.
Work through each screen, answer the questions as you go (multiple-choice, short-answer and games) and collect ⭐ stars. Press Start when you're ready.
2.3 Weather & climate
Weather vs climate
The two words sound similar but mean different things, and Eduqas expects you to be precise:
Weather — the day-to-day state of the atmosphere at a place: temperature, rainfall, wind, cloud, sunshine. It can change hour to hour.
Climate — the average weather of a place taken over a long period (usually 30+ years). It is what you expect, not what you get on one day.
The overall UK climate is temperate maritime — that means it is mild (never very hot or very cold), wet and changeable, with rain fairly evenly spread through the year.
Key idea: "The UK had a heatwave last week" describes weather; "the UK has mild, wet summers and cool winters" describes climate.
UK climate
Why the UK is mild and wet
Several factors combine to give the UK its temperate maritime climate:
Latitude — the UK sits in mid-latitudes (about 50–60°N), so the Sun's energy is fairly moderate: never tropical heat, never polar cold.
The sea & the warm North Atlantic Drift — this ocean current carries warm water from the tropics up past the UK, warming the air above it and keeping our winters mild for our latitude.
Prevailing south-westerly winds — the dominant winds blow from the south-west, across the warm Atlantic. They pick up moisture, so they arrive mild and wet.
Altitude — temperature falls with height (roughly 1°C per 100 m), so high ground is colder; air forced to rise over hills also cools and rains (relief rainfall).
Distance from the sea (continentality) — the sea heats and cools slowly, so coasts stay milder; places far inland swing to greater extremes.
Key idea: the prevailing SW winds crossing the warm North Atlantic Drift are the main reason UK weather is mild and wet, especially in the west.
Quick check
Why so mild and wet?
?The UK has surprisingly mild winters for its latitude and plenty of rain. Which factor best explains this?
UK climate
Why the UK climate varies from place to place
The UK does not have one single climate — it varies across the country because of those same factors:
West wetter than east — the SW winds hit western hills (Wales, the Lake District, western Scotland) first, so the air rises, cools and drops relief rainfall. The east lies in a drier rain shadow.
North cooler than south — higher latitude and higher land in the north mean lower temperatures than the south of England.
West milder in winter — the sea and North Atlantic Drift keep western coasts milder, while eastern/inland areas are colder and can get frost.
Global circulation
Global atmospheric circulation
Air moves around the planet in giant loops called cells. In each hemisphere there are three: the Hadley, Ferrel and Polar cells. They decide where the world is wet and where it is dry.
At the Equator the Sun heats the surface strongly, so air rises (low pressure), cools and rains — giving tropical rainforests. That air spreads out and sinks at about 30° (high pressure), giving warm, dry deserts and hot semi-arid zones.
Rule of thumb:rising air = low pressure = wet; sinking air = high pressure = dry.
UK weather
High and low pressure over the UK
Our day-to-day weather depends on which pressure system is passing over us. The two opposites are the anticyclone (high) and the depression (low):
Low pressure (depression) — air is rising, so it cools and forms cloud: expect wind, cloud and rain. Depressions bring fronts and move across the UK quickly.
High pressure (anticyclone) — air is sinking, which stops cloud forming: expect calm, dry, clear weather. In summer this brings hot, sunny spells; in winter it brings cold, clear nights with frost and fog.
Match it
Match the weather term to its meaning
Tap a term on the left, then tap its correct meaning on the right.
Quick check
Which system is this?
?It is a settled July week: skies are clear and blue, the air is calm and it is hot and dry for days. Which pressure system is over the UK?
Weather charts
Reading a synoptic (weather) chart
A synoptic chart shows pressure using curved lines called isobars (lines joining places of equal pressure), plus the fronts where different air masses meet:
Where isobars are close together, the pressure changes quickly over a short distance, so winds are strong. Warm fronts (semicircles) bring steady rain; cold fronts (triangles) bring short, heavy downpours.
Key idea: the spacing of the isobars tells you the wind: close = windy, far apart = light winds.
Explain it
Your turn — why the west is wetter
✎Explain why the west of the UK is usually wetter than the east. Use the words prevailing SW winds, rise, relief rainfall and rain shadow.
Model answer
The prevailing SW winds cross the warm Atlantic and reach the western hills of the UK first, carrying a lot of moisture.
Forced to rise over the high land in the west, the air cools, its water vapour condenses and it drops relief rainfall — so the west is wet.
By the time the air sinks down the eastern side it has lost much of its moisture, leaving the east in a drier rain shadow.
Extreme event 1 · intense low
Tropical cyclone — Hurricane Katrina (2005)
An intense low-pressure event is a tropical cyclone (hurricane). They form over warm tropical oceans (about 27°C+), where rapidly rising warm, moist air creates very deep low pressure, torrential rain and destructive winds.
Winds spiral around a calm central eye. On land the cyclone brings ferocious winds, torrential rain and a storm surge (a rise in sea level that floods the coast).
Where: Hurricane Katrina struck the US Gulf coast in August 2005, hitting New Orleans hardest.
Cause: it grew over the very warm Gulf of Mexico, then its storm surge overwhelmed the levées protecting low-lying New Orleans.
Sort it
Katrina: social, economic or environmental?
Impacts are grouped into social (people), economic (money/jobs) and environmental (nature). Tap the correct type for each impact of Hurricane Katrina.
Extreme event 1 · impacts
Katrina: impacts & responses
Eduqas wants you to show that an extreme event affects different groups differently, and to describe the responses:
Social: the storm surge breached the levées and about 80% of New Orleans flooded; over 1,800 people died and hundreds of thousands were made homeless. Poorer residents without cars found it hardest to evacuate.
Economic: homes, businesses and the port were wrecked; oil and gas facilities on the Gulf were shut down, and the clean-up and rebuilding cost tens of billions of dollars.
Environmental: coastal wetlands were damaged, and floodwater was contaminated with sewage, chemicals and oil.
Responses:immediate — evacuation orders, rescue by boat and helicopter, emergency shelters, and aid from the government and charities. Long-term — the levées and flood defences were rebuilt stronger, and evacuation planning was improved.
Explain it
Your turn — why some suffered more
✎Extreme weather events do not affect everyone equally. Explain why some groups were harder hit by Hurricane Katrina than others. Refer to wealth, evacuation and where people lived.
Model answer
Wealth mattered: poorer residents were less likely to own a car or have savings, so they could not easily evacuate or find somewhere else to stay.
Where people lived mattered too: many low-income neighbourhoods sat on the lowest-lying land, which flooded deepest when the levées failed.
So the same event hit vulnerable, poorer and low-lying communities much harder than wealthier residents on higher ground who could leave in time.
Extreme event 2 · persistent high
Heatwave & drought — Europe 2003
A dominant high-pressure event is a heatwave. When an anticyclone sits over an area and refuses to move for weeks, the sinking, cloud-free air lets temperatures climb day after day, and with little rain the ground dries out into drought.
A blocking anticyclone parks over the region for weeks. Sinking air and clear skies mean intense sunshine, no rain and rising heat — a heatwave and drought.
Where & when: the summer 2003 heatwave across Western Europe (worst in France), when a blocking high brought record heat.
Cause: a persistent high-pressure system stalled over Europe, so hot, dry air built up over many days.
Quick check
Where the deserts are
?Many of the world's hot deserts (like the Sahara) lie at about 30° north and south. Why is it so dry there?
Sort it
High or low pressure weather?
Tap a weather characteristic, then tap the pressure system that brings it over the UK.
☀️ High pressure (anticyclone)
🌧️ Low pressure (depression)
Extreme event 2 · impacts
The 2003 heatwave: impacts & responses
A dominant high-pressure heatwave affects different groups in different ways:
Social: tens of thousands of extra deaths across Europe, especially among the elderly and people living alone in cities where the heat was trapped ("urban heat island"). Hospitals were overwhelmed.
Economic: the drought cut crop yields, so farmers lost income and food prices rose; railways buckled and roads melted, disrupting transport; wildfires destroyed property.
Environmental: rivers ran low and warm, harming fish; forests dried out and burned; crops and vegetation withered.
Responses:immediate — health warnings, advice to stay hydrated and out of the Sun, and extra care for vulnerable people. Long-term — many countries set up heat-health early-warning plans so that hospitals, carers and the public are prepared for future heatwaves.
Quick check
High or low event?
?Eduqas asks you to study two contrasting extreme events. Which pair correctly matches each event to its pressure system?
Quick check
Reading the weather chart
?On a synoptic chart, the isobars over the UK are drawn very close together. What does this tell you about the weather?
Recap
The key ideas to know
Weather vs climate: weather = day-to-day; climate = long-term average.
UK climate: temperate maritime (mild, wet, changeable) — set by latitude, the sea & warm North Atlantic Drift, prevailing SW winds, altitude and continentality.
UK variation: west wetter/milder (relief rainfall), east drier (rain shadow), north cooler than south.
Global circulation: Hadley, Ferrel, Polar cells — rising air at the Equator (low pressure) = rainforest; sinking air at ~30° (high pressure) = deserts.
UK weather: low pressure (depression) = cloud, rain, wind; high pressure (anticyclone) = calm, dry, clear (hot in summer; frost/fog in winter).
Synoptic charts: isobars close = windy; warm fronts (semicircles) = steady rain; cold fronts (triangles) = heavy showers.