Monthly Attribution Overview – June 2026

In June 2026, the United States experienced slightly above-average temperatures, with an average anomaly of 0.7°F across 192 analyzed cities. The Southwest was the warmest region, with temperatures more than 2.9°F above normal, and Flagstaff, Arizona, recorded the most unusual warmth at 4.0°F above normal. Long-term trends show that 189 of the 192 cities have warmed since 1970, with Reno, Nevada, seeing the greatest increase of 10.6°F. Climate attribution analysis using the Climate Shift Index (CSI) indicates that San Juan, Puerto Rico, had 30 days where temperatures were at least two times more likely due to climate change.

• The United States saw slightly above-average temperatures in June 2026, with an average anomaly of 0.7°F across 192 cities. While the central and eastern U.S. had below-average temperatures, above-average conditions were more common in the western U.S. and parts of the Northeast and Southeast.
• The Southwest was the warmest U.S. Climate Region in June 2026, with average temperatures exceeding the norm by more than 2.9°F. Flagstaff, Arizona, was the most unusually warm city, recording a temperature 4.0°F above usual.
• Long-term warming trends since 1970 are evident in 189 of the 192 analyzed cities. Reno, Nevada, showed the most significant increase, with average June temperatures rising by 10.6°F compared to 1970.
• Climate attribution analysis using the Climate Shift Index (CSI) shows that San Juan, Puerto Rico, had 30 days in June 2026 where temperatures were at least two times more likely because of climate change. On average, cities in the Southwest had the highest number of days (14) with a CSI of 2 or above.

APA

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

Chicago

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

Wikipedia

{{cite report |author=Climate Central |title=Monthly Attribution Overview – June 2026 |date=2 July 2026 |url=https://www.climatecentral.org/report/monthly-attribution-overview-june-2026 |access-date=23 October 2026 |via=Climate Insights Directory}}

BibTeX

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