This is mostly just a clone of Tempestacons, but with the SVG images named according to the icon codes in these popular weather APIs.
I wrote a handy conversion script in Bash to facilitate converting the SVG images to PNG in any size or color you wish.
Both this package and the original Tempestacons are licensed under Creative Commons Attribution 4.0:
https://creativecommons.org/licenses/by/4.0/
You may use the icons and source code in any manner you choose, as long as appropriate credit is given.