Board Thread:General Discussion/@comment-16490119-20130902230601/@comment-75.109.0.156-20140408075758

Cyclone doesn't deal frost damage, though. If you look at the CK for the spell, it actually doesn't have any magic type attached to it at all and is unaffected by perks that increase frost damage. The description for it reads "A cyclone that does points of damage per second and may fling victims into the air." - Based on the lack of keywords that give it frost damage, or any frost resistance attached to it, it's safe to say the spell wasn't meant to deal frost damage and instead uses it as a shader. It doesn't even slow enemies like frost does since the spell has no slow attached to it.