Hi Gianluca,

Netro supports Dark Sky, AccuWeather, OpenWeatherMap and WeatherUnderground. We will more sites in the future. We suggest you visit the official website to check the historical data to choose the most accurate one. https://darksky.net/  

https://www.accuweather.com/ 
https://openweathermap.org/ 

https://www.wunderground.com/ 

Thanks,

Netro Support