If you're trying to tackle the problem of prediction, I doubt an average blurring mechanism will work. I lived in Holland for two years, and from what I remember interacting with students, everyone liked http://www.buienradar.nl/ It provides more granularity by showing the cloud coverage for a given area over time. Was very suitable for those random little rain cloud just around the corner. Personally, I also value very much the hourly forecast at http://www.theweathernetwork.com while living in Toronto. A simple day's forecast in general might be too misleading.
As a US-based user, two things would be more useful at first use: a way to switch between Celsius and Fahrenheit that has a closer proximity to your search results, and the ability to search location by zipcode (which seems to be standard on US sites like weather.com).
That said, love the functionality! It's fascinating seeing the disparity between different forecasting sites.
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I used to compare weather forecasts from different sources, and then I came across Weatherline [1] (which uses forecast.io); their way of displaying weather information is just amazing. Enough information density presented in a clear way that it would make Edward Tufte shed a single tear.
[1] http://www.producthunt.com/posts...
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Nice tool. According to noaa it will be 93F tomorrow afternoon, forcast.io has us pegged at 64F for tomorrow here in the middle of the Santa Cruz Mountains. I suppose I should carry a sweater. I imagine noaa is pulling fairly local, while forcast.io is getting things from Santa Cruz 10 miles away.
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