This plugin allows you to specify real-world GPS coordinates for each in-game world. It will then periodically look up the current weather conditions (rain, thunder, snow, etc.) in the real-world location and change the weather of the in-game world to match.
Use cases:
For help configuring the plugin, refer to the wiki.
This plugin is fresh out of development and I'm currently testing it on my own server. Feel free to create issues for bugs you find and/or reasonable feature requests.