The American Discovery Trail South Route - Illinois is a 290 mi trail that starts in Emma Township, Illinois and ends in East St. Louis, Illinois. The trail is considered to be medium to hike and has a total elevation gain of 21319 ft. Normally the trail takes 1 day to complete but can be finished in less than a day. Either you are not allowed to bring your dog on the American Discovery Trail South Route - Illinois or it is generally not advised. The warmest months are June, July, and August and the coldest months are December, January, and February. The wettest months are June, July, and August and the driest months are September, October, and November.Photo Credit:U.S. Fish and Wildlife Service HeadquartersChaddavis.photographyDaniel SchwenHuw Williams (Huwmanbeing)