What are the elements of the weather, and how are they measured and recorded?
The elements of weather, the instruments used to measure them, and how weather data is recorded and displayed (AO1, AO3).
A focused CCEA GCSE Geography guide to measuring the weather. Covers the seven elements of weather, the instrument used for each, the role of a Stevenson screen, and how to read and present weather data including synoptic charts and climate graphs.
Reviewed by: AI editorial process; not yet individually human-reviewed
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What this dot point is asking
CCEA wants you to know the elements of the weather, the instrument that measures each one, and how weather data is recorded and presented. Weather is the day-to-day state of the atmosphere, while climate is the average weather of a place over about thirty years. This is a skills-rich dot point: as well as naming instruments, you must be able to read a synoptic (weather) chart and describe a climate graph, both of which appear in resource-based questions.
The seven elements of the weather
Learn the elements and instruments as fixed pairs. The commonest mark-loser is pairing the right element with the wrong instrument.
The Stevenson screen
Recording and presenting the data
CCEA tests two ways of displaying weather and climate data, and both appear as AO3 skills questions.
- Synoptic (weather) charts. These maps use isobars, lines joining places of equal atmospheric pressure. Isobars close together mean a steep pressure gradient and strong winds; widely spaced isobars mean light winds. Each weather station is shown as a station circle whose symbols give cloud cover, wind and temperature.
- Climate graphs. A climate graph shows the average climate of a place. Bars show mean monthly rainfall (read on the right axis, in millimetres) and a line shows mean monthly temperature (read on the left axis, in degrees Celsius). Always state which axis you are reading and give the units.
Weather versus climate
The distinction is a frequent one-mark trap. Weather is the day-to-day, short-term state of the atmosphere (today is cold and wet). Climate is the average weather of a place measured over a long period, usually about thirty years (this region has mild, wet winters). One unusually warm day does not change a climate.
Worked example: reading a synoptic chart
Common mistakes
Examples in context
Example 1. Why the Stevenson screen stands on grass, not concrete. If a thermometer sat above tarmac it would read several degrees too high, because dark surfaces absorb sunlight and radiate heat. Standing the screen above short grass at a standard height removes this bias, so a station in Belfast can be fairly compared with one in London or Lisbon. This is the whole point of standard instruments and exposure: comparable data.
Example 2. From station circle to forecast. On a synoptic chart a station circle that is fully shaded with a long wind arrow and several feather barbs tells the forecaster the sky is overcast and the wind is strong. Combined with falling pressure and approaching fronts, this signals a depression bringing rain. Reading these symbols quickly is exactly the skill the resource-based paper rewards, because it turns raw data into a description of the weather.
Try this
Q1. Name the instrument used to measure atmospheric pressure and the unit it is read in. [2 marks]
- Cue. A barometer, read in millibars (mb).
Q2. Give two features of a Stevenson screen and explain what each one does. [4 marks]
- Cue. White to reflect sunlight (shade reading); louvred sides for free airflow; raised about 1.25 m for a standard height away from ground heat.
Q3. What is the difference between weather and climate? [2 marks]
- Cue. Weather is the day-to-day state of the atmosphere; climate is the average weather of a place over about thirty years.
Exam-style practice questions
Practice questions written in the style of CCEA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
CCEA Unit 1 (style)4 marksName two elements of the weather and the instrument used to measure each.Show worked answer →
Four marks, one for each correct element and one for each matching instrument.
Temperature is measured with a thermometer (a maximum-minimum thermometer records the day's highest and lowest readings).
Precipitation is measured with a rain gauge, a funnel and graduated cylinder that collects rain in millimetres.
Other valid pairs are wind speed with an anemometer, wind direction with a wind vane, atmospheric pressure with a barometer, sunshine with a Campbell-Stokes sunshine recorder, and humidity with a hygrometer or wet-and-dry-bulb thermometer.
Markers reward a correctly matched element and instrument; a wrong pairing scores only the part that is right.
CCEA Unit 1 (style)6 marksExplain why some weather instruments are kept inside a Stevenson screen.Show worked answer →
Six marks for explaining how the screen gives a fair, standardised reading.
A Stevenson screen is a white, louvred wooden box on legs that holds the thermometers and the hygrometer.
It is painted white to reflect direct sunlight, so the thermometer measures air temperature in the shade rather than the heat of the sun.
The louvred (slatted) sides let air flow freely around the instruments, so the reading reflects the true surrounding air.
It stands about 1.25 metres above short grass so readings are taken at a standard height and are not affected by heat radiating from the ground.
Markers reward the link between each design feature (white, louvred, raised, shaded) and the fair, comparable reading it produces.
Related dot points
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A focused CCEA GCSE Geography guide to air masses and frontal depressions. Covers the main air masses affecting the British Isles, how a depression forms at the polar front, and the sequence of weather as the warm and cold fronts pass over.
- The characteristics of anticyclones and the contrasting summer and winter weather they bring to the British Isles (AO1, AO2).
A focused CCEA GCSE Geography guide to anticyclones. Covers what an anticyclone is, why high pressure brings settled weather, and how the weather it produces differs sharply between summer and winter in the British Isles.
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A focused CCEA GCSE Geography guide to extreme weather. Covers what makes weather extreme, how a tropical storm forms, the social, economic and environmental impacts of a major event, and how warning and management reduce the damage.
- The natural and human causes of climate change, its global and local effects, and the strategies used to manage it (AO1, AO2).
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Sources & how we know this
- CCEA GCSE Geography specification — CCEA (2017)
- CCEA GCSE Geography (2017) Unit 1 past papers and mark schemes — CCEA (2024)