I won't lie, snow conditions do not improve when the temperature drops to -30C at H85 level. It just doesn't. Snow becomes slow, crystals are grabby. Any residual moisture is frozen solid in an absolute way. It's just cold and the snow surface changes. Unless there is decent snowfall right ahead of it or with it, I do think turning conditions will be variable on the firm/crusty side.
Snow conditions often improve greatly on the rebound side of the arctic shot. When it goes arctic, and then moderates to like 25F, the snow seems to loosen up very nicely. Best turns IMO will be on the rebound side of the cold shot.