Weather icon which weather data source is more accurate?

Weathericon does not take information from other weather software, only takes the first city of google weather as the data source, and the one in the settings cannot be used; For example, if you download WeatherHD as a data source, when the data in it is 7 degrees and it is 3 degrees in Google weather, the Weathericon will display 3 degrees, and "3" will be displayed above the WeatherHD icon.