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