Doctors advised people to stay inside on Sunday or at least avoid the cold weather as much as possible, especially children and the elderly.
When a patient comes in with hypothermia, doctors at Mercy Medical Center said they use warm water to slowly bring the person's body temperature back to normal. Doctors said you should never use hot water on a person with frostbite, because it can often make it worse.
Early signs of hypothermia include a tingling or numbness in the body, pale or bluish skin and intense shivering.
Health experts said even a few minutes outside on a day with below zero temperatures or windchill could cause frostbite and hypothermia.