Monthly Attribution Overview - July 2025

In July 2025, the United States experienced an average temperature anomaly of 1.4°F across 196 analyzed cities, with the eastern half of the country seeing above-average temperatures. The Ohio Valley was the most unusually hot region, while the West was the only region cooler than normal. Long-term data indicates that 189 of the 196 cities have seen warming trends since 1970, with Reno, Nevada, experiencing the most significant increase. Climate change influence was particularly strong in the Southeast and in San Juan, Puerto Rico, where 19 days reached a Climate Shift Index (CSI) of 5.

• Across 196 analyzed cities in the U.S., the average temperature anomaly for July 2025 was 1.4°F, with 161 cities recording hotter-than-average temperatures.
• Regional temperature variations were stark: every city in the eastern half of the U.S. experienced above-average temperatures, with the Ohio Valley (including West Virginia, Tennessee, Ohio, Illinois, Missouri, Indiana, and Kentucky) being the most unusually hot region at 2.4°F above normal. Conversely, the West was the only region cooler than normal, averaging 1.36°F below normal.
• Long-term warming trends since 1970 were observed in 189 of the 196 analyzed cities. Reno, Nevada, showed the most extreme warming, with its average July temperature increasing by 12.5°F since 1970.
• Climate change significantly influenced temperatures in several areas, as evidenced by the Climate Shift Index (CSI). Forty-six cities had at least two weeks with CSI values of 2 or higher. San Juan, Puerto Rico, recorded 19 days at CSI 5, meaning temperatures on those days were at least five times more likely due to climate change.

APA

Climate Central (2025). Monthly Attribution Overview - July 2025. https://www.climatecentral.org/report/monthly-attribution-overview-july-2025

Chicago

Climate Central. Monthly Attribution Overview - July 2025. 2025. https://www.climatecentral.org/report/monthly-attribution-overview-july-2025.

Wikipedia

{{cite report |author=Climate Central |title=Monthly Attribution Overview - July 2025 |date=4 August 2025 |url=https://www.climatecentral.org/report/monthly-attribution-overview-july-2025 |access-date=23 October 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{climatecentral2025monthly, author = {{Climate Central}}, title = {{Monthly Attribution Overview - July 2025}}, institution = {Climate Central}, year = {2025}, month = aug, url = {https://www.climatecentral.org/report/monthly-attribution-overview-july-2025}, urldate = {2026-10-23}, note = {Indexed by Climate Insights Directory} }