The Hottest Day in the History of France?

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Hmm. Maybe not. Assuming this is accurate, it is extremely likely the heat was highly exaggerated.
As Steve notes, this is a tile room which is notorious for reflecting heat. Official temperatures are supposed to measured over grass, not tile roofs.

Second, that is a set of amateur weather instruments. That, in and of itself, is not bad but we have no way of knowing whether the instruments are properly calibrated.

Before you scoff at France, we have that issue with a number of climate stations in the United States.

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