The weather docklet provides you with various weather data for today and the next several days. It has several weather sources available.
To configure the docklet, right click and select "Settings", enter the name of the city you want to monitor, weather provider (3 available), whether to use metric (default is customary) and the interval of update.
Under the menu there is also a link to the Radar Map and a link to the full weather report for the next 7 days.
Where it gets interesting is when you left click on the weather icon. Just a word of warning: Don't leave Docky's area while in this mode or it will reset to the standard dock look. You can also press the escape key or left-click almost anywhere on the dock to get back.
In this mode there are left and right arrow buttons. This will change the page displayed, showing different information on each page.
The first page gives you a short icon based view of the available forecast with minimal and maximal expected temperature:
The second page gives you a line chart with the minimal and maximal expected temperature for the forecast days:
The third page gives you a detailed weather report for the current day: