Until a vaccine is developed it's going to be an issue. Viruses don't just disappear. They're around. People get the flu in summer. Not as often, of course.

Corona cases are increasing in Arizona, Nevada and New Mexico, primarily are in the bigger cities, yes. But if the "this virus won't survive in the summer heat and dry conditions" is true then they shouldn't be seeing significant increases.

Hopefully they'll come up with a vaccine soon.