Equinoctinal

The equinoctinal gales are often ministers of vengeance, scattering desolation on sea and land.

Source: wiktionary

Since solar and sidereal time are estimated from the passage of the sun and the equinoctial point across the meridian of each place, the hours are different at different places: while it is one o'clock at one place it is two at another, three at another, &c.;

Source: wiktionary

The heavy rains due usually in September, and popularly designated as the equinoctinal storms, almost always create an early demand for light rubbers, and in many shoe stores these goods, especially in women's and children's styles, are already in evidence.

Source: wiktionary

Then Clara and Mr. Taylor set out with bag and baggage, but I've heard since, Clara and himself had to return to Mr. Campbell's about nine o'clock finding all the bridges in the country washed away by the late equinoctinal storm, which raged from Thursday mid-day until Saturday evening with intense severity.

Source: wiktionary