One way you can do is to make use of LiveWeb addin, which allows you to
insert and view web pages live. Using the addin, you can then link to a
webpage that shows real time weather.
LiveWeb addin can be downloaded here:
http://skp.mvps.org/liveweb.htm
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Shawn Toh (tohlz)
Microsoft MVP PowerPoint
Site Updated: Feb 03, 2008
(Amazing PowerPoint animations, artworks, games here)
http://pptheaven.mvps.org
PowerPoint Heaven - The Power to Animate