The places with the outbreaks have been in the 40s (no hotter, no colder)— Tehran, Northern Italy, Seattle, New York, etc; or in places with air conditioning
Singapore reports and publishes every transmission in great detail and literally every single transmission was in a heavily air conditioned place.
“or in places with air conditioning”
(Good thing they don’t have A/C in the entire developed world, and the office-work critical-personnel parts of the 2nd and 3rd world.)