The Winter's Howl is a Wonder Weapon featured in canon and non-canon Zombies maps.
It first appears in the map Five. It shoots out rays of ice, freezing Zombies and slowing them down. It was tested at the Pentagon, and was likely created there too. It is sometimes thought of as the American version of the Ray Gun, however, this doesn't really make sence considering it has much less ammo, different affects, and isn't even fully automatic.
It also appears in the revamped version of Verruckt.
When Pack-a-Punched, the Winter's Howl turns into the Winter's Fury. This gives it much more ammo, and increased damage.