The summer of 2021 was the Pacific Northwest’s hottest in a millennium

A United States maps focused on the average summer temperatures in 2021. The west coast is covered in a darker red color while the rest of the country is a light red/orange color.

The summer of 2021 was the Pacific Northwest’s hottest in a millennium

Tree ring data from the Pacific Northwest reveal that the region’s average summer temperature in 2021 was the highest since at least the year 950.