Seriously this is so... Frustrating. If you're going to keep this "feature," it might be useful to have a kind of tooltip feedback if I tap on the bar, trying to figure it out.
I was hoping that it had something to do with the rain chance %, showing when, during the day to expect said rain.
Here in the Pacific NW especially in the fall, the intra-day temp differences are very small, so the bars are short. And the bar placement looks weirdly random.
Also in the PNW, we get a lot of rain this time of year (fall), and the temps are cool, so I just thought the blue bars were rain related, which would actually be helpful, to know when during the day one might expect precipitation.