Monthly Attribution Overview - January 2025

In January 2025, 166 out of 191 analyzed U.S. cities were cooler than normal, with the Ohio Valley and Southeast particularly affected. Despite these cool anomalies, no city set a low temperature record for January, and the warming influence of climate change remained pronounced. Alaska was the warmest state, with Fairbanks recording the highest anomaly at 14.6°F above normal. Analysis using the Climate Shift Index (CSI) showed that days where warmer temperatures were made at least twice as likely by climate change outnumbered days where cooler temperatures were made twice as rare.

• Most U.S. cities experienced temperatures cooler than normal in January 2025, with 166 of 191 analyzed cities showing cool anomalies. The Ohio Valley and Southeast were particularly cold, with cities averaging more than 4.5°F cooler than average. Kansas, Wyoming, and West Virginia had cities that were, on average, more than 7°F cooler than normal.
• Alaska was the most anomalously warm state, with its average city being 9.7°F warmer than usual. Fairbanks, Alaska, was the most unusually hot city, recording a temperature 14.6°F above normal.
• Despite the widespread cool anomalies, no city in the analysis set a record for the coldest January. Only Bluefield and Parkersburg, West Virginia, recorded the month as among their five coldest Januarys on record.
• Climate change continued to exert a warming influence despite the overall cool month. Days where warmer temperatures were at least twice as likely due to climate change (CSI level 2 or higher) were more frequent than days where cooler temperatures were at least twice as rare (CSI level -2 or lower).
• Specific cities showed significant climate-driven warming in January 2025. San Juan, Puerto Rico, had 27 days at CSI 5, meaning temperatures were at least 5 times more likely because of climate change. Juneau, Alaska, is the fastest-warming ACIS station for January on average, having warmed 9.6°F since 1970.

APA

Climate Central (2025). Monthly Attribution Overview - January 2025. https://assets.ctfassets.net/cxgxgstp8r5d/7KWO6nbseApTHTfPGYfJcG/97d608401b9aaf87106da7a45380c57d/Climate_Central___January_2025_U.S._Attribution_Report.pdf

Chicago

Climate Central. Monthly Attribution Overview - January 2025. 2025. https://assets.ctfassets.net/cxgxgstp8r5d/7KWO6nbseApTHTfPGYfJcG/97d608401b9aaf87106da7a45380c57d/Climate_Central___January_2025_U.S._Attribution_Report.pdf.

Wikipedia

{{cite report |author=Climate Central |title=Monthly Attribution Overview - January 2025 |date=January 2025 |url=https://assets.ctfassets.net/cxgxgstp8r5d/7KWO6nbseApTHTfPGYfJcG/97d608401b9aaf87106da7a45380c57d/Climate_Central___January_2025_U.S._Attribution_Report.pdf |access-date=23 October 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{climatecentral2025monthly, author = {{Climate Central}}, title = {{Monthly Attribution Overview - January 2025}}, institution = {Climate Central}, year = {2025}, month = jan, url = {https://assets.ctfassets.net/cxgxgstp8r5d/7KWO6nbseApTHTfPGYfJcG/97d608401b9aaf87106da7a45380c57d/Climate_Central___January_2025_U.S._Attribution_Report.pdf}, urldate = {2026-10-23}, note = {Indexed by Climate Insights Directory} }