The Southwest and Southeast are the warmest regions in the US. However, out of the four regions defined by the census bureau, the West and South would have to be the warmest.
There are many regions in the US, not just two. For example the Northeast and the Southeast.
It is warmest in the southwestern deserts and Hawaii, especially during summer months.
The Pacific
Africa is considered the warmest continent, with many regions experiencing high temperatures due to its proximity to the equator and vast desert landscapes like the Sahara.
Africa is the warmest continent on Earth. It has a diverse range of climates, but it is generally known for its hot temperatures, especially in regions near the equator.
South and West
The warmest city in the US to visit in December is typically Miami, Florida, with average temperatures ranging from 60-77F.
The best safest and warmest city in the US is the city of Scottsdale, Arizona. In second place is the city of Plano, Texas.
The regions of the Southern US (16) and the Western US (13) have the most combined states: 29.
Appalachian and Rocky Mountains.
The warmest part of the troposphere is typically near the surface, as this is where the Earth receives direct sunlight and heat energy. Temperature decreases with altitude in the troposphere, so the upper regions are generally colder.
The two largest land form regions in the US are the Rocky Mountains and the Appalachian Mountains. In Canada, the largest land form region is called the Maritime terrains.