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Open Weather Map provides interactive maps of current and historic weather conditions. The Open Weather Map API allows users to retrieve the current weather at a city or weather station, the historical measurements for a weather station, or a list of cities and/or weather stations in a given rectangle (limited by geographic coordinates). The API uses RESTful calls issued in JSON format.
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There are no mashups, developers or code associated with this API yet.
see new version of API http://openweathermap.org/wiki/API/2.1