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US Swelters: July Shatters Heat Records
11 Aug
Summary
- July 2026 became the hottest month on record for the Lower 48 states.
- Average temperatures exceeded the 20th-century norm by 3.3F (1.8C).
- Unusually warm nights contributed significantly to the record-breaking heat.
The United States experienced its hottest month in over a century of official record-keeping, with July 2026 setting a new national average temperature record. Temperatures across the Lower 48 states averaged 76.89F (24.94C), a significant 3.3F (1.8C) above the 20th-century average, narrowly breaking the previous record from July 1936.
This extreme heat was attributed to multiple heat dome events that developed across the nation, trapping hot air and leading to prolonged periods of elevated temperatures. Every state in the contiguous US recorded July averages at least 1F above normal. Notably, the record was driven by unusually warm nights, which scientists emphasize are critical for human recovery from daytime heat.
The severe conditions had a tangible impact on daily life for many Americans. Nearly half reported higher electricity bills due to increased air conditioning use, and many experienced disruptions to travel plans and outdoor activities. Scientists reinforce that the increasing frequency and intensity of such extreme heat events are consistent with the effects of human-driven climate change.
