An Arctic blast in early January 2025 is bringing extreme cold to the U.S., but the concept of “normal” temperatures has shifted due to climate change. This warming trend is altering cold snap patterns and affecting winter weather, as seen with heavy lake-effect snow around the Great Lakes. At the University of Michigan, researchers are studying these shifting patterns to understand better the long-term impacts of climate change on regional weather, highlighting the growing influence of global warming, even during cold spells.