You could go into the -- www/img/weather -- folder and replace cloud_01c and cloud_02a files with blank replacements.
MAKE SURE you create BACKUPS of those files before replacing them!
These image files are a type of transparent layer, so you have to find images with the same format.
The way I did was by using and art program, load the images, then white out the 'dust' clouds. I could provide the two blanks I have if you or anyone wants them. Im not sure of image file types for RPG Maker games so maybe another F95 member can help out on what else you could do.
I did try just renaming the files, but I figured this would end up with an in-game error 'missing image' and it did.