Sign up for the Morning Brief email newsletterto get weekday updates from The Weather Channel and our meteorologists. Each passing month brings . Here are 10 destinations that are best visited in October. 1. Witness The Fall Monarch Butterfly Migration In Mexico And California Around October every year, monarch butterflies migrate south and west to Mexico and Southern California, where they escape cold winters. According to the U.S.Forest Service, some butterflies​ to reach their winter home, traveling by day and...