Antonyms of adj estival

1 sense of estival

Sense 1
aestival, estival -- ((rare) of or occurring in summer; "the sky was a burnished aestival blue"; "estival winds")

INDIRECT (VIA wintry, vernal, summery) -> autumnal -- (of or characteristic of or occurring in autumn; "the autumnal equinox"; "autumnal fruits")
INDIRECT (VIA vernal, summery, autumnal) -> wintry, wintery -- (characteristic of or occurring in winter; "suffered severe wintry weather"; "brown wintry grasses")
INDIRECT (VIA summery, autumnal, wintry) -> vernal -- (of or characteristic of or occurring in spring; "the vernal equinox")

Similarity of adj estival

1 sense of estival

Sense 1
aestival, estival -- ((rare) of or occurring in summer; "the sky was a burnished aestival blue"; "estival winds")
       => summery (vs. autumnal) (vs. wintry) (vs. vernal) -- (belonging to or characteristic of or occurring in summer; "summery weather"; "summery dresses")