A WordPress widget is a block that displays specific data or performs specific function. These widgets take place in the sidebars of your WordPress site. To get an in-depth explanation of how to add and use widgets on your site, I recommend you to read this article on wpbeginner

Weather Station offers some widgets to display meteorological or astronomical data and, like with other widgets, you can use them in the sidebars of your site. If your theme is able to display sidebars in pages or posts, you can even take advantage of this opportunity.

You can learn more about the specific parameters of each widget: