What are equinoctial storms?

Equinoctial storms are storms popularly supposed to occur at the time of the spring and fall equinoxes. Equinox is derived from Latin and signifies “equal night.” It is a time of the year when the days and nights are equal in length. That storms are more frequent and severe at such times is merely a myth of unknown origin. The autumnal equinox occurs September 21 or 22 and records indicate that storms are neither more frequent nor more severe on those days than on other dates in September. In fact records for a period of fifty years showed that there were actually fewer storms between September 20 and September 25- than there were during the five days immediately preceding September 20. The same is true of the vernal or spring equinox, which occurs March 20 or 21. Storms are not more frequent or severe on those dates than on other l dates in March. The notion about equinoctial storms in one form or other dates back at least to 1748 and probably originated among seafaring people.