[Thomas Guidotti]

Weather isn't just "rain." In AC weather refers to time of day, clouds, temperature, and even wind intensity and direction, which effects a number of visuals but more importantly track conditions. It could be that Henrique is lazy and doesn't want to bother mixing it up, but I'm guessing it is because it's safer if everyone can practice exactly what they'll be racing on.

I was thinking the same thing, I just couldn't explain why there were always the same conditions.

Now you have removed a doubt.