It turns out that more heat, higher humidity and direct sunlight (UV rays) drastically reduce the virus' survivability on hard surfaces. Not to zero, unfortunately, but they do shorten the 'lifespan' by a large factor. This was learned via lab tests varying these three factors.
A similar finding was reported earlier by Chinese researchers, but I've been more than cautious about putting much faith in what they're permitted to report. I'm inclined to trust our DHS people.
This finding suggests you are safer outdoors, in direct sunlight, if you must be around people with whom you are not sequestered. I would still try to stay 6' away from them if possible. It also suggests that UV sources may be helpful in reducing viral load indoors. Do not overdose on UV, however, down that road are sunburn and skin cancer.
