Monthly Attribution Overview – July 2026

In July 2026, the United States experienced widespread above-average temperatures, with an average anomaly of 1.5°F across 192 cities. The Northern Rockies and Plains were the warmest region, exceeding normals by more than 4.0°F. Long-term data indicates that 185 of the 192 analyzed cities have warmed since 1970, with Reno, Nevada, showing the most significant increase. Climate attribution analysis using the Climate Shift Index (CSI) showed that San Juan, Puerto Rico, had 31 days where temperatures were at least two times more likely due to climate change.

• Across 192 analyzed cities in the U.S., July 2026 saw an average temperature anomaly of 1.5°F, with 169 cities recording warmer-than-average conditions and only four recording cooler-than-average conditions.
• The Northern Rockies and Plains were identified as the warmest U.S. region in July 2026, with average temperatures more than 4.0°F above normal.
• Long-term warming trends since 1970 were observed in 185 of the 192 analyzed cities, with Reno, Nevada, experiencing the largest increase at 12.5°F.
• Climate attribution analysis using the Climate Shift Index (CSI) indicates that San Juan, Puerto Rico, had 31 days in July 2026 where temperatures were at least two times more likely because of climate change. On average, the Southwest region had the highest number of days (22) with a CSI of 2 or above.
• Rapid City was the most unusually warm city in July 2026, recording a temperature 6.9°F warmer than usual.

APA

Climate Central (2026). Monthly Attribution Overview – July 2026. https://www.climatecentral.org/report/monthly-attribution-overview-july-2026

Chicago

Climate Central. Monthly Attribution Overview – July 2026. 2026. https://www.climatecentral.org/report/monthly-attribution-overview-july-2026.

Wikipedia

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

BibTeX

@techreport{climatecentral2026monthly, author = {{Climate Central}}, title = {{Monthly Attribution Overview – July 2026}}, institution = {Climate Central}, year = {2026}, month = aug, url = {https://www.climatecentral.org/report/monthly-attribution-overview-july-2026}, urldate = {2026-10-23}, note = {Indexed by Climate Insights Directory} }