According to the Almanac the first day of fall for 2012 begins in the Northern Hemisphere on September 22, 10:49 A.M. EDT The word equinox comes from the Latin words for "equal night." The fall and spring equinoxes are the only days of the year in which the Sun crosses the celestial equator.
Fall in Key West is a bit different. It’s all about the subtle changes, in the weather and on the island. A seasoned visitor or residents can recognize a drop in the humidity, a stronger breeze, and notice a calmer Key West atmosphere as the island locals take their final vacations and start their preparations for Fantasy Fest.