I've done a lot of work with perception systems and sensors. GP is right on the money with the problems. Rain is even difficult. Snow is the worst though -

I've done a lot of work with perception systems and sensors. GP is right on the money with the problems. Rain is even difficult. Snow is the worst though - it is both wet and super reflective. Super reflective dazzles your laser/obscures cameras. Wet screws up your radar.