October is the tenth month of the year October used to be the eigth month of the year in old Roman calendars. Octo is the Latin word for eight. October is the tenth month in the Gregorian calendar, but we've just not gotten around to changing the name. During October it’s autumn in the Northern Hemisphere and spring in the Southern Hemisphere. In Australia, New Zealand and other Southern Hemisphere countries the days are getting longer and things are getting warmer while in the Northern Hemisphere people are watching as the leaves on trees get brown and know the coldest time of the year is just ahead.
In the United States of America they frequently hold elections in October.
Customs and traditions
Munich in Bavaria, Germany holds an Oktoberfest (that's how they spell it in German)  when people drink a great deal of Beer and listen to a great deal of Music. Other cities like Birmingham, England also hold an OKtoberfest. 
The Druids celebrated this holiday "with a great fire festival to encourage the dimming Sun not to vanish" and people "danced round bonfires to keep evil sprits away, but left their doors open in hopes that the kind spirits of loved ones might join them around their hearths". And also
The Celts, who lived 2,000 years ago in the area that is now Ireland, the United Kingdom and northern France, celebrated their new year on November 1. This day marked the end of summer and the harvest and the beginning of the dark, cold winter, a time of year that was often associated with human death. Celts believed that on the night before the new year, the boundary between the worlds of the living and the dead became blurred. On the night of October 31 they celebrated Samhain, when it was believed that the ghosts of the dead returned to earth.