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Edexcel provides a real weather Large Data Set (LDS) that exam questions draw on. You will not memorise the numbers, but you should know its structure, its quirks, and how to handle missing or anomalous values.
What you'll be able to do
The Edexcel Large Data Set is real from UK and overseas weather stations across set time periods. Exam questions assume you have worked with it and understand its layout and units.
It contains both quantitative variables (temperature, rainfall, wind speed, pressure) and qualitative ones (location). Knowing the units and typical ranges helps you spot impossible or anomalous values.
Tip — Know the units (e.g. wind speed in knots, rainfall in mm) — exam questions test whether a value is realistic.
Some entries are blank (data not recorded — often shown as "n/a" or "tr" for trace rainfall). These are not zeros and should not be treated as such. Anomalies (clearly wrong readings) may be identified and excluded.
Formula recap
Common mistakes to avoid
Key takeaways
Test yourself
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