new weather app design

Does anyone know what the colored bars are supposed to indicate on Apple’s redesigned weather app? I've read through descriptions on several websites, but they all brush over this aspect to focus on the flashier new features.

I get that the different colors represent different temps (blue = cool, yellow = warmer, etc.), and that the dot on the current day indicates the current temp. But what do the varying lengths and positions of the colored bars indicate? Usually Apple makes thing pretty intuitive, but I can't figure this out.