That, I guess, was a standard JAA question.
If you want to say that it doesn't have much in common with normal practical piloting for a living, I would agree with you.
Buit let me tell you, as an experienced ground school instructor, I recognise the dead hand of the JAA (or an FTO preparing students for the JAA).
After all, no real pilot would ask such an unrealistic question, would they?
I'm not saying that you don't have to be aware of temperature error. But most real pilots are far more concerned about cold temperatures, not warm ones.