This is not a standalone app.
This theme works only with Go Weather Ex v.3.9 and higher.
Download Go Weather Ex: http://goo.gl/4MPML3
How to use the theme?
After you download and installing the theme,
Enter GO Weather EX --> Theme (usually the star shaped icon in the top right corner)--> Local --> choose the theme --> Apply
How to add a System Widget?
Long press empty home space or click Menu --> Add --> Widgets --> Find GO Weather EX Widgets --> choose the size and theme.
If you have any questions or suggestionsthen email me at firstname.lastname@example.org
To avoid misunderstandings, it's highly recommended to use Google mail for your messages to me! Since the other mail services sometimes move your messages to the "spam" or my replies are lost.