All coronaviruses as well as all other respiratory viruses are seasonal. Thy are seasonal for 3 reasons. High temperature makes it more difficult for people to develop lower respiratory infections (the outer layer of the virus becomes sticky and does not migrate as easily to ones lower respiratory tract) , the high dew point in the summer as well as well as the large amounts of additional UV light create hydroxy radicals and peroxides which act to provide protection form viruses in our lungs and third because of the additional daylight in spring and summer our immune system develops more resistance to infection. Now I am not saying the disease is going to go away or still not have some significant virulence in June but if you compare it to all other viruses its virulence will bottom out in June. If you examine hospital admissions relative to the number of new cases and the number of deaths today relative to the number of cases between 10 and 20 days ago in states like texas and florida you will see these numbers are changing by a factor of 2 about every two weeks during the last month.
Now the drop could be explained solely by social distancing except the drop in cases is occurring well in to the social distancing phase. We'll know for sure if it is seasonal in the next two weeks. By the way Fauci thinks its seasonal too.