This repo produces maps, charts, and tables examining the relationship between weather and population. Data comes from https://sedac.ciesin.columbia.edu/data/collection/gpw-v4.

You can edit the HTML or JS to change some style, but there is not too much else to easily modify.

Read the blog post answering some population questions at https://triplelog.com/blog/what-is-the-population-of-that-region.html