Cryokinesis

Cyrokinesis is the ability to to control and manipulate ice and snow. Boreas, the god of the North Wind, and his daughter Khione both have this power, and since Zethes and Calais are demigod sons of Boreas, it's possible that they possess this power as well. It can be presumed that any child of the two gods listed above would have cyrokinesis (although there are none mentioned). It is assumed that any child of Poseidon/Neptune might also have this power to either the same or higher degree, being as Poseidon is the god of the seas.

The Lost Hero
When first arriving at Boreas' palace in Quebec, Khione introduces herself to the demigods as the Goddess of Snow and Winter. She first shows her power when Piper and Jason try to hold hands; when she sees this she causes their hands to become so cold it felt like they were being burned. Later while flying through a snow storm over Detroit, the wiring in Festus' head becomes frozen. Leo notes that there is no way this could of happened naturally as it would be too hot for ice to form, but doesn't make the connection with Khione. Later when the Hunters were defending the Wolf House from a pack of wolves and the Earthborn, Khione arrives on the scene and freezes most of the Hunters, including Thalia.

The Son Of Neptune
Blowing a freezing cold wind, a Hyperborean Giant in Alaska turns dozens of griffins into "feathery Popsicle sticks", when Percy, Hazel, and Frank take refuge under his thighs to escape them.

Percy manges to show the ability of cryokinesis to a degree as shown when he manipulates the ice and snow around him to make an 'ice hurricane' that he uses to fight off the Shades created by Alcyoneus.

Abilities
The full range of Cyrokinesis are unknown; however, the general extent of these powers are:
 * Controling snow, ice, hail, sleet, frost.
 * The ability to create or summon blizzards and hailstorms.
 * Project jets of swirling ice and snow from one's hands.
 * Freezing people and objects
 * Likely immunity to cold.
 * In The Lost Hero, Khione created a "nuclear blast" made of pure cold and ice oppose to radiation and heat

Users of Cryokinesis

 * Boreas
 * Khione Images_Poseidon.jpg
 * Hyperboreans
 * Percy Jackson (to a degree)
 * Poseidon