The CSS-Tricks site has a cool article this week about using weather data to change your website’s appearance. Of note for Yahoo developers is that they’re using the Yahoo! Weather web service to fetch current conditions. The article has an accompanying sample page which focuses on the CSS and PHP code necessary to swap out the page appearance. The remaining work would be to intelligently identify where the visitor is coming from and fetch their weather automatically. Kind of a neat application for a service that probably doesn’t get a lot of attention.