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U.S. cities - highest number of heat danger days 2050

This statistic provides a projection of the cities in the United States that are projected to see the most Heat Index days above 105 degrees Fahrenheit (or 40.6 degrees Celsius) by 2050. Laredo, Texas is expected to see about 170 days of "dangerous" or extreme heat by 2050. The number of danger days is expected to rise worldwide.

Extreme heat in the U.S. – additional information

Projected changes in global average temperature are associated with widespread changes in weather patterns. Scientific studies indicate that extreme weather events, such as heat waves, are likely to become more frequent or more intense within the next few years. These changes may lead to an increase in heat-related deaths in the United States. Outdoor temperatures can affect daily life in many ways. Extreme heat and the combination of high heat and humidity can pose a serious risk for human health. Exposure to extreme heat can lead to heat stroke and dehydration, as well as cardiovascular, respiratory and cerebrovascular disease. When the weather becomes excessively hot, it can be deadly. According to the National Weather Service, heat waves caused 45 fatalities in the United States in 2015.

The average temperatures in the U.S. have risen significantly since 1895. Long-term changes in climate can directly or indirectly affect many aspects of a person’s life. For example, warmer days could increase air conditioning or water supply costs. One way to measure the influence of temperature change on energy demand is by using heating and cooling degree days. Cooling degree days measure the difference between outdoor temperature and a temperature that people generally find comfortable indoors. Cooling degree days have not increased significantly over the past decades. However, a slight increase is evident for this period. In 2014, there were around 1,300 cooling degree days in the U.S., compared to 1,241 in 2009. More cooling degree days indicate an increase in temperature, leading to a greater likeliness of using air conditioning.

Ranking of U.S. cities based on projection of most Heat Index days above 105 degrees Fahrenheit by 2050

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Release date

July 2016


United States

Survey time period


Number of respondents

360 cities

Supplementary notes

The U.S. National Weather Service defines as dangerous any day when the heat index (the combination of heat and humidity, commonly known as the "feels like temperature") exceeds 104 degrees Fahrenheit. 105 degrees Fahrenheit is the equivalent to 40.6 degrees Celsius.

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Statistics on "Greenhouse gas emissions in the United States"

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