Monthly Attribution Overview – April 2026

In April 2026, the United States experienced an average temperature anomaly of 3.4°F across 192 cities, with the Ohio Valley being the warmest region. The report highlights that 183 of the analyzed cities have shown long-term warming trends since 1970, with Reno, Nevada, seeing the greatest increase. Climate attribution analysis indicates that in San Juan, Puerto Rico, temperatures on 19 days in April were at least two times more likely due to climate change.

• The United States experienced widespread above-average temperatures in April 2026, with an average anomaly of 3.4°F across 192 cities. While the western U.S. was only slightly above average, the national trend was driven by the east, particularly the Ohio Valley, which was the warmest region with average temperatures more than 5.8°F above normal.
• Extreme warmth was recorded in several cities: 22 cities had their hottest April on record, and 62 cities experienced one of their top five warmest April temperatures. Jonesboro, Arkansas, was the most unusually warm city, recording a temperature 8.2°F above usual.
• Long-term warming trends since 1970 are evident in 183 of the 192 analyzed cities. Reno, Nevada, showed the most significant increase, with average April temperatures rising 7.9°F since 1970.
• Climate attribution analysis using the Climate Shift Index (CSI) shows that in San Juan, Puerto Rico, 19 days in April had temperatures that were at least two times more likely because of climate change. On average, cities in the Southwest region had the highest number of days (10) with a CSI of 2 or above.

APA

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

Chicago

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

Wikipedia

{{cite report |author=Climate Central |title=Monthly Attribution Overview – April 2026 |date=5 May 2026 |url=https://www.climatecentral.org/report/monthly-attribution-overview-april-2026 |access-date=23 October 2026 |via=Climate Insights Directory}}

BibTeX

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