equinoctial
e-qui-noc-tial
noun
A storm or strong wind occurring around the time of an equinox.
"The equinoctial brought unexpected heavy rainfall."
adjective
Pertaining to an equinox or occurring during the period of an equinox.
"The region often experiences fierce equinoctial storms."
Thesaurus
Synonyms: celestial equator, equinoctial circle, equinoctial line