Weissenberger, the son of a plant nursery owner, was born on 21 December 1914 in Mühlheim am Main in the Grand Duchy of Hesse of the German Empire [REF].
He joined the military service of the Luftwaffe with 2./Flieger-Ersatz-Abteilung 14 (2nd Company of Flier Replacement Unit 14) in Detmold on 19 October 1936.