The goal of this project is to develop a library of weather related utilities written in Java. This project is eagerly seeking any contributions or support. There are more web data repositories and formats to parse into Java objects, there is code to be ported from Perl, and whatever else you can think.
The current Java code can grab weather observations and forecasts for 3,000 locations around the world. These are called METAR observations and forecasts and are available for free from the U.S. National Weather Service. Most locations are in the U.S., but there are probably 10-20% of the locations around the world.
There is also beginning support for converting temperatures between F, C, and K units.