Geography: 4. Weather and Climate

UK Weather and ClimateDefinitions of weather and climateWeather is what the sky and air are like right now — for example, is it sunny, raining, windy, or cloudy today?Climate is the usual weather in a place over a long time — like saying the UK has a cool, wet climate.Weather can change every day; the climate stays the same for years.The UK’s climate is called temperate, which means it’s never too hot or too cold.We learn about both to understand how the weather affects our lives, homes, and environment.Weather features and instruments used to measure themTemperature is measured with a thermometer — it tells us how hot or cold it is.Rainfall is measured using a rain gauge, which collects water in millimetres.Wind direction is shown by a wind vane, and wind speed by an anemometer.Air pressure (high or low) is measured with a barometer, and it helps predict changes in the weather.Cloud cover and sunshine can be recorded using observation and special instruments like a sunshine recorder.How it rains – relief, convectional and frontal rainfallRelief rainfall happens when moist air rises over hills or mountains, cools down, and makes rain — common in places like the Lake District or South Downs.Convectional rainfall happens when the sun heats the ground, the air rises, cools, and forms heavy showers or storms — this is common in the summer.Frontal rainfall happens when warm and cold air masses meet — the warm air rises over the cold, and it rains. This is common in the UK’s changing weather systems.All three types are part of the water cycle.Understanding them helps us know why it rains and where it’s most likely to happen.Weather systems – anticyclones and depressionsA depression is a low-pressure system — it brings cloud, wind, and rain and moves across the UK from west to east.An anticyclone is a high-pressure system — it brings calm, clear weather, often with sunshine or frost.In winter, anticyclones can cause cold, foggy mornings; in summer, they bring dry, hot weather.These systems are part of what causes the UK’s changeable weather.Weather forecasts show where they are so we can prepare for rain or sunshine.