The thermometer outside your family's front door doesn't have to register below freezing for cool weather to threaten your child's health. The physically exhausted and the very young are at greater risk of being unable to maintain their body temperature. Just knowing the weather forecast and dressing your child appropriately can literally mean the difference between life and death.
Severe hypothermia requires immediate emergency medical intervention.
However, any amount of body cooling needs to be taken seriously and treated with caution and care. Learn to recognize the early warning signals that cold weather is posing a threat to your child's health. Seek emergency medical care. Is still suffering from symptoms after 30 minutes of home treatment, or if symptoms get progressively worse. Move your child to a warm, sheltered area.