Once your Pi is connected to the Internet, it can reach out and do things on the Internet, like looking at webpages and reporting what it finds there.
When a website or service provides data already formatted for you—as a commas-separated value (CSV) file or as a JavaScript Object Notation (JSON) file—they often do so via a formal Application Programming Interface (API).
But you can also just go out, get a webpage off their website, and start looking through it.
This project is a simple Python file that gets a copy of the weather forecast for Pasadena, hunts through looking for the current temperature, and then prints that information out in the terminal.
Try it out! Get a copy of the file, put it onto the server (via scp or by copy-pasting the sourcecode into a file you're editing on the server using nano), and then run it.