Abbott-Smith Manual Greek Lexicon
ὀπώρα (G3703)
1 ὀπώρα , -ας, ἡ , [in LXX: Je 31 (48):32 47 (40):10 , 12 ( קַיִץ )*;] late summer , early autumn (the time between the risings of Sirius and Arcturus, i.e. late July, all August and early September). By meton. (as being fruit-time), ripe fruits Re 18:14 (cf. φθινοπωρινά , Ju 12 ).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain