In temperate climates, the seasonal flu tends to flare in winter and recede as spring arrives. But what about the new coronavirus? Will the arrival of warmer weather keep it in check? U.S. President Donald Trump has weighed in, saying in a televised address that April sunshine could chase away the scourge. Health experts say it’s more complicated than that. Just because outbreaks of influenza wilt with seasonal changes doesn’t mean a different respiratory virus will behave in the same way.