Cloudiness and Latitude

It seems that cloud coverage tends to cluster around high and low cloudiness. At first glance, there does not seem to be a strong correlation between cloudiness and latitude. Upon a closer look, there seems to be certain latitudes which have a concentration of cities with either many clouds or no cloud coverage at all. On this day, there seemed to be a cluster of cities with no or very little cloud coverage from just under 10 degrees latitude to 70 degrees latitude. There is a similar cluster from -10 degrees to -40 degrees latitude.

Use the navigation bar or click the images in the visualizations below for more graphs and analyses.