Spring will officially arrive Thursday night, when the vernal equinox occurs, ushering in a wave of warm and humid weather that could help snuff out the deadly coronavirus. Right? Well, that’s been a popular theory making its rounds ever since COVID-19 swept into the United States and turned our daily routines upside down. But is that premise accurate? Will the warm spring and hot summer temperatures actually stop the coronavirus in its tracks — the same way the seasonal flu fades out when the weather turns warm? Here’s what experts from five different health agencies and medical schools say. 1....