Temperatures across the country are expected to be exceptionally high this weekend, with record highs potentially being set in the Northeast. The National Weather Service has issued excessive heat warnings for many areas — particularly the Plains, Midwest and much of the East — where temperatures are expected to range from 90 to 100 degrees.

While warm and even hot weather can be enjoyable, extreme heat puts many — especially infants, young children, and the elderly — at risk of heat-related illnesses. The frequency of heat-related health issues, such as heat stroke and exhaustion, is directly related to how high temperatures are and the level of humidity. According to the Department of Homeland Security, extreme heat often results in a greater number of annual deaths than any other weather-related hazard.

24/7 Wall St. has identified the country’s 50 hottest cities based on the average number of 90-plus degree days per year using climate data from the National Oceanic Atmospheric Administration.

There are 50 large cities with populations of at least 10,000 where the temperature reaches at least 90 degrees Fahrenheit for more than 67 days in an average year.

Click here to see the 50 hottest cities in America.
Click here to see our detailed findings and methodology.