YoWindow is providing weather status by accessing local weather stations through the Internet. In order the program to display the weather, you need to have a stable Internet connection. Also, if the program thinks that the weather station is unreliable, it will not display any information, like your case. To manually add a weather station, use Google to find the closest station and to find its ICAO code. After this, open the application, go to Main Menu > Location > Location Properties > enter the ICAO code and click OK.