NWS/NOAA formerly the Weather Bureau have always search for more data. One way to get more data points is to have more surface observations. They train individuals the proper technique (scientific method) of observing, recording and transmitting surface observations. Notice in this picture, they are using a standard white vented shelter, that si good. So many observations are tainted with improper placement and technique. There is a website that is dedicated to exposing how these bad observations tend to bias the data stream by injecting erroneous data.
If we could have a data point every kilometer square, the surface model forecasting predictability rate would be near prefect. But we don’t so you get what you get and you don’t pitch a fit.