On average, the coldest days of winter in our current climate, based on temperature records from 1991 through 2020, are 5 degrees Fahrenheit (2.8 Celsius) warmer than they were between 1976 and 2005.

On average, the coldest days of winter in our current climate, based on temperature records from 1991 through 2020, are 5 degrees Fahrenheit (2.8 Celsius) warmer than they were between 1976 and 2005.

The PHZM is based on "the average annual extreme minimum winter temperature." The 2012 map used historical data of the average annual minimum temperature from 1976 through 2005. The 2023 map uses ...

The change in annual average summer temperatures from 1970-2024 was calculated using linear regression. Climate Central's local analyses include 247 U.S. weather stations.