Weather

As the API from Weather Channel has changed, the XBMC built-in weather forecast vanished from core and from 15th November onwards it is fully addon based.
As of December 4th, xbmc ships with a default weather addon: Weather Undergound.
Several alternative weather addons are available in the official repository, for instance World Weather Online and Weather Plus

This feature requires a build from 15th November 2011 or newer and needs the following commit included:
ada86f4c96e5fbd35b9c4d35d87b0b37517f927f

1 Configuration

In order to use the weather forecast you can specify which add-on shall provide the weather information (by default Weather Underground will be selected).

By default, your internet IP address will be used to auto select your location. You can over-ride this and/or provide additional locations from the Settings button off the Home Screen.

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  Step 1: You start at specifying which addon shall provide the data

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  Step 2: Then go to the "Settings"-button below the provider menu and setting at least one location in there

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  Step 3: From now on you'll be able to get your weather forecast by clicking on the weather tab in the Home Screen

Change between Celsius/Fahrenheit in Appearance Settings with the Region option.

2 Forecast for Unknown Locations

Weather forecasts for smaller cities/villages/communities locations outside of America/Canada, for example in Europe may or may not exist on the weather service you're using. The only thing you can do then is select the closest larger city/village/community.