Summer is the hottest of the four seasons. At the summer solstice, which occurs on June 21st in the Northern Hemisphere and December 22nd in the Southern Hemisphere (when it is summer in the Northern Hemisphere, it is winter in the Southern Hemisphere and vice versa), the days are longest and the nights are shortest. Summer is a great time to spend time outdoors and practice a healthy lifestyle. There are plenty of chances to eat fresh fruits and vegetables, get some sun, and get in shape, whether it be by playing a sport, exercising or just working around the yard.