Cumul.us uses the idea of the wisdom of the crowd to bring you the weather in a new way. They aggregate from a couple news sources to get your city's forecast, and they let you make predictions as to what the weather will be like in the future. The more often your predictions are close to the actual numbers, the higher your rating goes so that people know to trust your weather predictions in the future. Often it's hard to determine what you're going to wear, but if you check out cumul.us, you can see what other people in your area are planning on wearing, and you can dress accordingly. They display the most popular choices for what people are wearing on top, bottom, and as accessories via ShopStyle. Instead of depending on what the local forecaster has predicted, why don't you get a crowd's prediction from cumul.us.