Where does “Spätsommer” come from?
Spätsommer (German) comes from German Sommer, from Middle High German sumer, from Old High German sumar, from Proto-West Germanic sumar, from Proto-Germanic sumaraz, from Proto-Indo-European sm̥m-aro-, from Proto-Indo-European sm̥-h₂-ó-, from Proto-Indo-European semh₂- — summer, year.
Spätsommer (German): late summer
Ancestry of “Spätsommer”, step by step