Um, actually, it matters a LOT! I had some bubblegum x durban in a greenhouse, and they got mold before the buds even joined into a cola...and I kept the humidity as low as was humanly possible. The Jack the Ripper x Qleaner I have outside is pretty much soaked 24/7, but not a speck of mold, and it's the second half of October now!
To the OP, try looking at outdoor Canadian strains. They have a cold, rainy climate too, and there's a lot of outdoor growing there. Naturally, they developed lot's of mold resistant strains.