The plug in integrates The International Research Institute for Climate and Society (IRI) data for Africa in WorldWind.  In WorldWind, you can view their datasets, but most importantly, click on points and it brings up graphs of variables such as rainfall.

The IRI was founded on the belief that scientific breakthroughs in our understanding of climate can help developing countries defeat persistent and often devastating problems.  Climate has an impact on health, water, agriculture and most other vital sectors, giving us the opportunity to help societies confront a whole range of hardships-from malaria epidemics to food shortages.

You can download the plug-in from here.  Below shows the plug-in in use.  Bull_UK also has more details.

After installing and activating the plug-in, you launch it from the toolbar menu.

Once loaded, you can select the dataset to view, the time period, view the map legend and data description and load the selected map.