Winters across the United States are getting warmer, with the current 1991–2020 dataset showing January temperatures are generally 0.5 to 1.5 degrees Fahrenheit higher than the preceding 1981–2010 period in most regions. This shift, calculated from long-term records at nearly 15,000 weather stations and updated every decade, reflects a national warming trend of about 0.17 degrees Fahrenheit per decade since 1901, leading to fewer freezing nights, a drop in heating degree days, and gradual changes that affect everything from energy planning to allergy forecasts.

Source: Earth.com