"June gloom" is a term used to refer to the constant low stratus cloud cover along the Southern California coast in late spring and early summer. It is caused by warm, inland air clashing with the cold Pacific, creating a marine layer that usually lasts all day. This condition only affects the coastal areas and clouds start to immediately dissipate once you get about 4 to 5 miles inland, where you get the beautiful, mild sunny days California is known for. Beach living isn't all its cracked up to be.