First of all, thank you for your comments and help, but I realized that I have given you too little information, so the following now some.
I myself am from Germany and as I said I am supposed to compare the data from private weather stations with professional weather stations. After I had chosen my 3 locations of professional weather stations, I was looking for 5 stations each in the immediate vicinity. Besides Weather Underground, I visited other platforms such as Netatmo, but found significantly more nearby weather stations on WU, which is why I chose WU. Now I wanted to ask the owners of the stations to give me some information about their devices and locations (height above ground, use of which measuring devices). For those who have registered a weather station with WU, what information did you have to provide when registering? And on the topic of getting the data, I was hoping for an easier way to get the data instead of laboriously copying it day after day.