YoWindow brings the fun back into weather apps, by displaying an animated landscape that reflects the actual weather conditions at your location, or at any other location that you specify! If it's raining outside, it's raining in your YoWindow application! If it's sunny, your YoWindow landscape is bathed in beautiful sunlight (even if you, sitting at your desk, are not). YoWindow isn't just for looks - it displays everything you need to know about the weather, from temperature, wind, and atmospheric pressure, to wind chill, UV values, and more! It even reflects the actual day and night cycles, complete with the proper phases of the moon! Even the change in seasons is reflected in YoWindow's animated landscape.
Windows 8 has Bing Weather built in, and it's also pretty well featured for a weather app.