Humidity was a recognised factor in SARS transmission:
"The better stability of SARS coronavirus at low temperature and low humidity environment may facilitate its transmission in community in subtropical area (such as Hong Kong) during the spring and in air-conditioned environments. It may also explain why some Asian countries in tropical area (such as Malaysia, Indonesia or Thailand) with high temperature and high relative humidity environment did not have major community outbreaks of SARS."
https://www.hindawi.com/journals/av/2011/734690/
Given the temperatures required are 38c to see any significant loss in viability of the virus, then as I say I'd focus on humidity!
Originally Posted by: Arcus