Sumer-hǽte

According to the Old English Dictionary:

an; -hætu (o);

sumer-hǽte

indecl. or gen. e; f. Summer heat :-- Gif ðære stówe neód oþþe gedeorf oðþe sumerhǽte hwylces eácan behófige si loci necessitas uel labor aut ardor aestatis amplius poposcerit, R. Ben. 64, 17. For ðære sumorhǽte, Ors. 3, 9; Swt. 132, 31. [Cf. Icel. sumar-hiti.] sumer-hæte