The max UV index in Toronto tomorrow is a 6. On a sufficiently overcast day, that may become a 3, maybe even lower. That would have a very significant effect on

The max UV index in Toronto tomorrow is a 6. On a sufficiently overcast day, that may become a 3, maybe even lower. That would have a very significant effect on odds of sunburn. Equally overcast on a high UV day in Bangkok on the other hand...