Ever wondered how meteorologists predict whether you'll need an umbrella... Show more
Geography
Irish
EnglishSign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
6
•
Updated Mar 24, 2026
•
Weather Measuring Instruments: A Simple Guide
1 / 8
Measuring Weather Basics
Weather measurement is all about collecting accurate data so meteorologists can create reliable forecasts. Whether it's farmers planning their harvests or you deciding what to wear to school, weather forecasts affect everyone's daily decisions.
There are seven main weather elements that scientists measure regularly. Each one requires a specific instrument and has its own unit of measurement. The most important ones you need to know are temperature (measured in °C with a thermometer), precipitation (measured in mm with a rain gauge), and air pressure (measured in millibars with a barometer).
Wind is measured in two ways: wind speed using an anemometer and wind direction using a wind vane (compass points). Scientists also track sunshine hours with a Campbell-Stokes recorder and humidity levels with a hygrometer.
Quick Tip: Create flashcards linking each weather element to its instrument and unit - this is exactly what examiners love to test!
Temperature and Precipitation Instruments
The Six's Maximum and Minimum Thermometer is your best friend for understanding temperature measurement. This clever U-shaped device contains mercury and alcohol, with two small steel markers called indexes that track the highest and lowest temperatures over 24 hours.
Here's how it works: as temperature changes, the alcohol expands or contracts, pushing mercury around the tube. The mercury moves the indexes, which stay in place to record the maximum and minimum temperatures. You read the current temperature from the top of the mercury columns, and the thermometer must be reset daily using a magnet.
Rain gauges are brilliantly simple - they're basically funnels that collect rainwater into a measuring cylinder. The key is placing them in open areas away from buildings or trees that might block rainfall. Measurements are taken at the same time each day (usually 9 am), and you read the water level at eye level to avoid errors.
Remember: 1 mm of rainfall means 1 litre of water fell on every square metre of ground - that's quite a lot when you think about it!
Wind and Air Pressure Measurement
Anemometers measure wind speed using three or four cups mounted on rotating arms. The faster the wind blows, the quicker the cups spin, and a counter converts these rotations into kilometres per hour. Wind vanes are even simpler - they're arrows that point into the wind to show direction.
Here's a crucial point that trips up many students: if a wind vane points west, you have a westerly wind coming FROM the west, not blowing towards it. This distinction is vital for exam success.
Barometers measure air pressure and are fantastic weather predictors. High pressure (above 1013 mb) usually means calm, dry weather because air is sinking - we call this an anticyclone. Low pressure (below 1013 mb) typically brings cloudy, wet, windy conditions because air is rising - this is called a depression.
Exam Gold: High pressure = happy weather, Low pressure = lousy weather. This simple rule will help you interpret barometer readings instantly!
The Stevenson Screen and Data Recording
The Stevenson Screen is absolutely crucial for accurate weather measurement. This white wooden box with slatted sides (called louvres) houses thermometers and hygrometers in standardised conditions, ensuring readings from different weather stations can be fairly compared.
Every feature has a purpose: the white paint reflects sunlight to prevent overheating, the louvres allow air circulation whilst blocking direct sun and rain, and the legs (about 1.2m high) avoid ground heat interference. The door faces north to prevent direct sunlight hitting instruments when opened for readings.
When taking readings, accuracy is everything. For rain gauges, pour collected water into the measuring cylinder and read at the bottom of the meniscus (water's curved surface). For Six's thermometers, read minimum and maximum temperatures from the bottom of the steel indexes, and current temperature from the mercury tops.
The Campbell-Stokes recorder uses a glass sphere to focus sunlight onto cardboard, burning a line that shows sunshine hours. Gaps in the burnt line indicate cloudy periods - it's like having a solar-powered weather diary!
Pro Tip: Practice reading instrument diagrams regularly - examiners often include them in questions, and understanding how to interpret readings is worth serious marks!
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
Most popular content in Geography
Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
Weather Measuring Instruments: A Simple Guide
Ever wondered how meteorologists predict whether you'll need an umbrella or sunglasses tomorrow? Understanding weather measurement is the key to accurate forecasting, and it's simpler than you might think. By learning about the instruments scientists use and how to read... Show more
Measuring Weather Basics
Weather measurement is all about collecting accurate data so meteorologists can create reliable forecasts. Whether it's farmers planning their harvests or you deciding what to wear to school, weather forecasts affect everyone's daily decisions.
There are seven main weather elements that scientists measure regularly. Each one requires a specific instrument and has its own unit of measurement. The most important ones you need to know are temperature (measured in °C with a thermometer), precipitation (measured in mm with a rain gauge), and air pressure (measured in millibars with a barometer).
Wind is measured in two ways: wind speed using an anemometer and wind direction using a wind vane (compass points). Scientists also track sunshine hours with a Campbell-Stokes recorder and humidity levels with a hygrometer.
Quick Tip: Create flashcards linking each weather element to its instrument and unit - this is exactly what examiners love to test!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Temperature and Precipitation Instruments
The Six's Maximum and Minimum Thermometer is your best friend for understanding temperature measurement. This clever U-shaped device contains mercury and alcohol, with two small steel markers called indexes that track the highest and lowest temperatures over 24 hours.
Here's how it works: as temperature changes, the alcohol expands or contracts, pushing mercury around the tube. The mercury moves the indexes, which stay in place to record the maximum and minimum temperatures. You read the current temperature from the top of the mercury columns, and the thermometer must be reset daily using a magnet.
Rain gauges are brilliantly simple - they're basically funnels that collect rainwater into a measuring cylinder. The key is placing them in open areas away from buildings or trees that might block rainfall. Measurements are taken at the same time each day (usually 9 am), and you read the water level at eye level to avoid errors.
Remember: 1 mm of rainfall means 1 litre of water fell on every square metre of ground - that's quite a lot when you think about it!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Wind and Air Pressure Measurement
Anemometers measure wind speed using three or four cups mounted on rotating arms. The faster the wind blows, the quicker the cups spin, and a counter converts these rotations into kilometres per hour. Wind vanes are even simpler - they're arrows that point into the wind to show direction.
Here's a crucial point that trips up many students: if a wind vane points west, you have a westerly wind coming FROM the west, not blowing towards it. This distinction is vital for exam success.
Barometers measure air pressure and are fantastic weather predictors. High pressure (above 1013 mb) usually means calm, dry weather because air is sinking - we call this an anticyclone. Low pressure (below 1013 mb) typically brings cloudy, wet, windy conditions because air is rising - this is called a depression.
Exam Gold: High pressure = happy weather, Low pressure = lousy weather. This simple rule will help you interpret barometer readings instantly!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
The Stevenson Screen and Data Recording
The Stevenson Screen is absolutely crucial for accurate weather measurement. This white wooden box with slatted sides (called louvres) houses thermometers and hygrometers in standardised conditions, ensuring readings from different weather stations can be fairly compared.
Every feature has a purpose: the white paint reflects sunlight to prevent overheating, the louvres allow air circulation whilst blocking direct sun and rain, and the legs (about 1.2m high) avoid ground heat interference. The door faces north to prevent direct sunlight hitting instruments when opened for readings.
When taking readings, accuracy is everything. For rain gauges, pour collected water into the measuring cylinder and read at the bottom of the meniscus (water's curved surface). For Six's thermometers, read minimum and maximum temperatures from the bottom of the steel indexes, and current temperature from the mercury tops.
The Campbell-Stokes recorder uses a glass sphere to focus sunlight onto cardboard, burning a line that shows sunshine hours. Gaps in the burnt line indicate cloudy periods - it's like having a solar-powered weather diary!
Pro Tip: Practice reading instrument diagrams regularly - examiners often include them in questions, and understanding how to interpret readings is worth serious marks!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
0
Smart Tools NEW
Transform this note into: ✓ 50+ Practice Questions ✓ Interactive Flashcards ✓ Full Practice Test ✓ Essay Outlines
Practice Test
Quiz
Flashcards
Essay
Most popular content in Geography
Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user