The "Weather - Yahoo Reports" widget is a more advanced weather widget offering you more scope for customizing the look and feel as well as the content of the widget.
Add your location - you need to open a browser window to the Yahoo weather site (the link is provided in the add slide window) and then search for the city or location within Yahoo. Then once you have located it - from the URL for the weather page, extract the 4 or 5 digit code from the end of the URL - e.g. https://weather.yahoo.com/united-kingdom/england/gloucester-21248/ where 21248 is for Gloucester UK. Enter this code into the "Zip code or City code" input field. You can also set the duration, background color and optionally, schedule the slide.