WeatherIn is startup that offers free current weather data, forecasts and history data to the developers of web-services and mobile applications. As a data source it uses official meteorological broadcast services, raw data from airports weather stations, raw data from radars, and raw data from official weather stations. All data are processed by unique mathematical algorithms that can provide precise online weather forecast data flow and different weather maps like clouds and precipitations. On above of that the service is focused on social aspect by involving owners of weather stations to connect them to the service to let weather data be more accurate.