http://www.bt.cdc.gov/disasters/winter/guide.asp
This document also available in Spanish
National Center for Environmental Health, Centers for Disease Control and Prevention
Exposure to cold temperatures can cause other serious or life-threatening health problems, particularly to infants and the elderly. This consumer health education brochure provides advice on preventing cold-related health problems and what to do to ensure the safety of yourself and your family in the event of a cold-weather health emergency.