Lighting Analysis for Revit automatically looks up the weather information from the weather station of your Revit project. To set up your project location:
See Specifying the Project Location page for more detail on how to set the location of your project in Revit.
You can download Update Release 2 for Revit 2014 here .
If you are using a model created before UR2, you will need to update the project location in
Manage tab Project Location panel Location. This is so that the data structure will be updated with the new StationID information that is enabled with UR2. Even if you use the same location, going through the update process will update the Station ID.