Live tile refresh frequency of the Windows 8 weather app?

The pre-installed weather app is using periodic tile updates to update it's live tile every 30 minutes. A background task is not necessary with periodic updates - once periodic updates are set up by an app, Windows will retrieve the new live tile content whether the app is running or not.

Unfortunately these are the parameters a third-party app such as your has to deal with. The Weather app that is pre-installed is not subject to these limitations since it is a Microsoft app - they aren't subject to the same limitations that we are.

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