Record Heat Engulfs Contiguous U.S. in July

The contiguous United States experienced its hottest month ever in July, according to the National Oceanic and Atmospheric Administration (NOAA). The average temperature was 76.89 degrees Fahrenheit (24.94 degrees Celsius) across the Lower 48 states. This surpassed the previous record set during the Dust Bowl in July 1936 by one-eighth of a degree. Record-keeping for these temperatures began in 1895.

Historical Context

Jeff Masters, a meteorologist with Yale Climate Connections, emphasized the significance of breaking Dust Bowl records. “It’s not good when you’re breaking records from the Dust Bowl,” he said. The Dust Bowl was marked by drought and extreme heat, leading to significant migration in the U.S. It’s concerning that modern temperatures are surpassing those times, indicating serious climate issues.

Unusual Weather Patterns

Despite cooler conditions in Alaska, hotter-than-average temperatures covered the Lower 48 states. The most intense heat was felt in the Mountain West, Southwest, Northern Plains, and Southeast. Russ Vose, NOAA’s chief of monitoring, noted that every state in the Lower 48 was at least 1 degree Fahrenheit warmer than the 20th-century average.

The Dust Bowl’s heat was more localized in the Midwest, worsened by agricultural methods at the time. In contrast, current high temperatures are largely attributed to burning fossil fuels, such as coal, oil, and gas, according to scientists.

“Extremely high temperatures across the continental U.S. this summer, along with intense drought and fire conditions, are consistent with the climate change signal,” Katharine Jacobs, a climate scientist at the University of Arizona, stated.

Impact of Nighttime Temperatures

NOAA highlighted that July’s record heat was largely driven by unprecedented nighttime low temperatures, which exceeded previous records by 0.7 degrees. Such increases are a clear sign of human-driven climate change, based on numerous scientific studies.

Day-to-day temperature calculations by NOAA include both daytime and nighttime averages. Nighttime lows play a crucial role in determining overall heat stress. According to Masters, if temperatures don’t drop at night, the human body struggles to cope with persistent heat.

Studies indicate that rising nighttime temperatures result in increased mortality and disrupted sleep, affecting public health.

Long-Term Climate Outlook

The summer of 2021 tied with 1936 as America’s hottest summer, defined as June through August. Up until July, 2026 is slightly cooler than 2021, which was marked by record-high June temperatures.

Masters pointed out that due to climate change, the current year might be among the coolest we’ll experience going forward. He emphasized the need for a significant reduction in fossil fuel consumption and financial investment in adapting to the evolving climate conditions.

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