You use maths when checking the weather

Quick answer

You use maths when checking the weather without even realising it! Weather forecasts use numbers to tell you the temperature, chance of rain, wind speed, and how much it might rain. All of this is maths in action.

Learning outcome

By the end of this page, you will understand how weather forecasts use numbers to help you plan your day – like knowing if you need a coat or an umbrella.

• You can read a temperature and know if it’s hot or cold
• You can understand what percentages like 30% mean for rain
• You can compare weather data from different days
• You can use weather numbers to make choices about what to wear or do

Why this matters

Weather forecasts are full of numbers, and understanding them helps you get ready for your day. When you know if it’s going to rain, how cold it is, or how strong the wind is, you can make smart choices – like taking an umbrella or wearing a jumper. This is maths in the real world!

How it works

Weather forecasts use numbers in many ways:

1. Temperature – This tells you how hot or cold it is. It’s measured in degrees Celsius (°C). For example, 10°C is quite cold, and 25°C is warm.
2. Chance of rain – This is shown as a percentage. For example, 60% means there’s a 6 in 10 chance it will rain. That’s quite likely!
3. Wind speed – This tells how fast the wind is blowing. It’s measured in miles per hour (mph) or kilometres per hour (km/h).
4. Precipitation – This is how much rain or snow is expected. It’s measured in millimetres (mm).

Examples you can see

Imagine you’re checking the weather for Saturday:

• It’s 15°C – that’s warm enough to wear shorts and a t-shirt.
• There’s a 20% chance of rain – not very likely, so you can go to the park.
• The wind is 10 km/h – not too strong, so no need to worry.
• It’s expected to rain 2 mm – very little, so an umbrella is not needed.

Here’s a simple weather table you can look at:

You can see that Wednesday is the rainiest and windiest day. This helps you know what to prepare for!

Try it as a mini adventure

Let’s go on a Weather Forecast Adventure!

1. Look at the weather app or a newspaper for the next 5 days.
2. Write down the temperature and chance of rain for each day.
3. Draw a picture of what you think you’ll do on each day based on the weather.
4. Compare the temperatures and decide which day is the warmest and which is the coldest.
5. Guess which day will have the most rain – and then check if you were right!

For example, if the temperature is 22°C and it’s 10% likely to rain, you might decide to go to the beach. But if it’s 3°C and 90% likely to rain, you’ll probably stay inside!

Common mistakes

• Mistake: Thinking that 50% chance of rain means it will rain half the day.
• Why it happens: Children might think percentages are about how much of the day it rains.
• Fix: 50% means there’s an equal chance of rain or no rain – not that it will rain for half the day.

• Mistake: Not understanding that a higher temperature means it’s warmer.
• Why it happens: Children might confuse high and low numbers.
• Fix: Explain that the higher the number, the warmer it is – like 25°C is much warmer than 5°C.

• Mistake: Ignoring wind speed when planning.
• Why it happens: Wind speed might seem less important than temperature.
• Fix: Show how a strong wind can make it feel colder or affect outdoor plans.

Parent and carer guide

Here’s how you can help your child learn about weather maths in just 5–10 minutes:

1. Check the weather together – Look at the temperature, rain chance, and wind speed on a weather app or newspaper.
2. Ask questions – “What do you think it means when it says 30% chance of rain?” or “Which day looks warmer?”
3. Make predictions – Ask your child to guess what you’ll do on a rainy day vs. a sunny day.
4. Use real-life examples – Talk about how you might dress or what you’d pack for a trip based on the weather.
5. Don’t worry about perfect answers – It’s okay if they don’t get it right the first time. Learning is about asking questions and trying again.

Practice questions

1. What does 0°C mean?
2. Which is warmer: 15°C or 5°C?
3. If there’s a 70% chance of rain, is it likely to rain?
4. What does 10 mm of rain mean?
5. Why is it important to know wind speed?

• Answer 1: It’s the freezing point of water.
• Answer 2: 15°C is warmer.
• Answer 3: Yes, because 70% is more than half.
• Answer 4: It means it will rain 10 millimetres – a small amount.
• Answer 5: Wind speed helps you know if it’s too windy to go outside or play.

FAQ

Why do we use numbers in weather forecasts?

Numbers help us understand and predict what the weather will be like. They help us know if we need an umbrella or a coat.

What does 100% chance of rain mean?

It means it will definitely rain – there’s no chance it won’t.

How do you know if it’s going to be cold or hot?

You look at the temperature in degrees Celsius (°C). If it’s below 10°C, it’s cold. If it’s above 20°C, it’s warm.

Can I use weather maths to plan my day?

Yes! If it’s going to rain, you can take an umbrella. If it’s going to be very hot, you might want to wear light clothes or go swimming.

Is it okay to be confused about percentages?

Yes! It’s normal to find percentages tricky at first. With practice and real-life examples, it gets easier.