rkcurioThey'd just appear out of nowhere
sp3ctr4lSlightly different but similar and related:
Always wondered what this was called. 8 get this often in winter, less during summer. Really puzzled me the first few times it happened, I just figured I was getting diabetes.
Basically, lighting conditions have to be just right to … basically, allow you to actually see your own white blood cells, in your own eyes, against the … background/everything you are seeing.
So my guess would be that in the summer, where you are, the … ambient light of the sky is too bright, it overwhelms this effect, but in the winter, maybe its mote generally humid, or the light is coming through more atmosphere , at morr oblique angles, and is thus less intense.