Depends how southwest... some of the desert areas are far from the ocean and so dry that they get cold and snowy at night, like New MexicoOther deserts, like Las Vegas, stay pretty warm. It can snow and get cool in parts of northern texas
We drove through Flagstaff AZ on Sunday with about 3 of snow on the ground. So it depends on the altitude of the area. We re in South Carolina now, it s raining and about 48 degrees.
it stinks. cold.