With an average temperature of 72.95 F, Hawaii is the hottest state in the United States. The high average temperature is a result of Hawaii's position as the only US state within the tropics.
Hawaii has seven different climate regions, as described by the Western Regional Climate Center. The high mountain climate region has the lowest temperatures in the state because of its altitude. The temperatures in the windward lowlands, which generally lie less than 2,000 feet above sea level, are often milder than in other climate regions. The lower mountain slopes on the leeward side are known for their cloudiness and temperature extremes. Florida, Louisiana, Arizona and Texas round out the list of the top five hottest states.