there's a question on brakes i'd like to ask and i'm sorry if it's already been asked before

i commute on a Fuji Cross Comp that i bought about a month ago. it has Tektro Oryx Cantilever brakes that have a good stopping power as far as i can tell. the problem is that they always squeak when it's raining. i'm not sure if that's normal or if there're better pads i could use or if it happens 'cause the bike is relatively new. what do you think?

thanks