People Exposed to Climate Change: United States
December 2024 to February 2025
Temperature anomalies
-
20 states (40%) experienced average temperatures that were normal or warmer-than-normal (i.e., an anomaly greater than or equal to 0) during the Northern Hemisphere winter.
-
Alaska had the highest temperature anomaly — 6.9°F (3.8°C) above its 1991-2020 normal.
-
13 states and the District of Columbia experienced a three-month period that was at least 1°F (0.6°C) below their 1991-2020 normals.
Top 10 U.S. States with the Highest Average Temperature Anomalies
Days with temperatures made twice as likely by climate change
- More than 71 million people across seven states experienced at least two weeks of days with temperatures that were at least twice as likely due to climate change.
Top 10 U.S. States with the Most Unusual Heat Added by Climate Change
Cities experiencing the most heat
- Three of the four cities with the highest temperature anomalies in the U.S. were located in Alaska, with average temperatures that ranged from 4.1°F (2.3°C) (Juneau) to 8.4°F (4.6°C) (Fairbanks) above normal.