@korina Thanks for your help! Yes, I know exactly the data in Premium version and free version are different. But...Actually, I'm trying to figure out the differences between the rainfall values shown on the 'Rain & Thunder' layers and basic weather forecast on the same place. I just found they aren't exact the same value, especially for heavier rainfall cases, so I have no idea which one is correct. I guess it might be caused by the different definition of accumulated time period or the interpolation between each grid point.
Please also note: For every language, a different place name label can be displayed, so please choose your correct language and data display.
Further discussion of place name and language issues or disputes should be directed to the OpenStreetMap Forum here: https://forum.openstreetmap.org/index.php > scroll down & select > users: (the relevant country for your dispute and/or question)
In the case of a political dispute please leave such topics out of the Windy forum and instead focus on the discussion of weather.