The North American Monsoon becomes active due to a pattern shift that impacts a large part of the United States and Mexico.

June 15 marks the official start of the monsoon season, but it's those muggy mornings and dusty evenings that signal the real ...

Arizona’s Saguaro National Park takes its name from the largest cacti in the United States. The park, which flanks Tucson, is home to millions of the cacti, which can grow up to 50 feet tall.