Summer Starts Early as U.S. Cities See Record Heat Rise Since 1970

As summer approaches, many regions across the country are experiencing unseasonably high temperatures reminiscent of July, prompting residents to brace for the heat ahead. 

A recent analysis conducted by Climate Central reveals that 97% of 242 cities across the United States, including Central Texas and Austin, have experienced an average temperature increase of 2.6°F since 1970.

Recent data reveals that one in five cities is now facing an additional month of extreme summer heat annually, a significant increase compared to the 1970s. Austin has recorded an increase of 50 days with temperatures exceeding normal summer averages over the last 55 years.

According to the report, increasing levels of carbon pollution are identified as the primary factor behind this trend. In 2024, emissions contributing to global warming surged unprecedentedly, leading to earlier and more severe summer heat waves.

Recent data reveals that the Northwest and Southwest regions are experiencing the most rapid temperature increases. Notably, Reno, Boise, El Paso, Las Vegas, and Salt Lake City have emerged as the top five cities that have warmed the most since 1970.

The health impact is severe. The National Weather Service has identified heat as the leading weather-related cause of fatalities, with a report from JAMA revealing that 2,325 individuals lost their lives due to heat-related incidents in 2023. 

Extended exposure to high temperatures elevates the risks of heat exhaustion and heat stroke, while also deteriorating air quality. This situation has led to declaring Ozone Action Days in regions such as Central Texas.

With 2025 ranking as one of the top five hottest years on record, experts emphasize the importance of planning and public awareness to safeguard public health during what may be an exceptionally hot summer.

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