The Pacific Northwest is least likely to experience extreme seasonal temperature changes due to its coastal proximity and maritime climate.

The Pacific Northwest is known for its relatively stable and mild climate, making it the region least likely to experience extreme seasonal temperature changes. This is primarily due to its proximity to the Pacific Ocean, which has a moderating effect on the local weather. The ocean helps to regulate temperatures, keeping winters cool but not freezing, and summers mild rather than scorching. In contrast, regions like the Midwest, Great Plains, and Northeast experience more dramatic seasonal temperature fluctuations because they are farther from the coast, lacking the stabilizing influence of ocean currents.