High Temperature and High Humidity Reduce the Transmission of Covid-19
But not by enough.  This epidemic has a growth rate (R) of at least 2. The article claims "One degree Celsius increase in temperature and one percent increase in relative humidity lower R by 0.0383 and 0.0224, respectively."
The March to July difference for New York City is only 19C. San Francisco, 9C. For both cities, humidity is relatively uniform year round.<p>Even assuming this result is meaningful, it still leaves an R way above 1.