I thought this was a pretty cool feature for businesses that depend on the weather - for example, before Christmas, I was speaking with Sydney Hang Gliding Centre about Facebook and we got onto the topic of how variable their business can be depending on the weather of the day.  I suggested adding a weather map and forecast to their website near the booking form so people can see how their chances are looking to get up into the air.  Taking that one step further, you could even add some automatic 'labels' above the weather data like "Great for gliding" or symbols.

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