Do you have a reference for that 50C summer within the century or is it just made up? It's way higher than I've heard of unless they'll live in a place that's a

Do you have a reference for that 50C summer within the century or is it just made up? It's way higher than I've heard of unless they'll live in a place that's already getting almost that hot anyway - in which case they can obviously already cope so it doesn't matter.