aestivoautumnal

es·ti·vo·au·tum·nal

(es'ti-vō-aw-tŭm'năl)
Relating to or occurring in summer and autumn.
Synonym(s): aestivoautumnal.
[L. aestivus, summer (adj.), + autumnalis, autumnal]

estivoautumnal, aestivoautumnal

occurring in summer and autumn.