Which US Locations Have the Highest and Lowest Average Temperatures?

The US locations that have the highest and lowest average temperatures — not counting locations in Alaska or Hawaii — are Key West, Florida, and Mount Washington, New Hampshire, based on long-term data from the National Oceanic and Atmospheric Association's major observing stations. Key West has an average temperature of 78.1° Fahrenheit (25.6° Celsius), and Mount Washington has an average temperature of 27.2° Fahrenheit (32.8° Celsius). Florida is generally the state with the highest average temperatures, with seven of the 10 hottest US locations being from the state.

More about temperature:

• Attempting to measure temperature is thought to date to the ancient Greeks in A.D. 170, and versions of thermometers were invented around 1593.
• The highest temperature recorded on Earth was 134° Fahrenheit (56.7° Celsius) in Death Valley, California, in 1913. The coldest was −128.6° Fahrenheit (−89.2° Celsius) in Antarctica in 1983.
• The average temperature worldwide is estimated to have increased by 1.4° Fahrenheit (0.8° Celsius) since 1880.