Wind Chill Temperature Measurement - Tech Info Document #295

Document Number: 295

Some days feel much colder than the air temperature reads. This is because the wind is blowing, also known as the wind chill factor. The wind chill index is a method that compensates for the wind chill factor using wind speed to calculate a measurement called the wind chill temperature (WCT). The wind chill temperature measurement is a more realistic number in terms of how the cold feels to human skin. This is essential information for anyone gearing up to work or play outdoors. The wind chill index used in the U.S. and Canada was developed using the latest advances in science, computer modeling and technology. For additional safety, the method also includes a frostbite danger index.

The Wind Chill Index is based on:

• Wind speed measured at average face height of 5 feet off the ground, where the face is the most likely part of the body to be exposed to the wind
• A consistent standard for skin tissue resistance
• Updated heat transfer theory (heat loss from the body to surroundings during cold windy periods)
• Assumes no heat impact from the sun (clear night sky conditions)

If you know the air temperature and wind speed, the wind chill temperature and frostbite risk can easily be determined using the following reference chart:

The information is also incorporated into the latest software available on the National Weather Service's Advanced Weather Interactive Prediction System.

Commonly Asked Questions

Q.	What is the wind chill temperature?
A.	Wind chill temp is the temperature that it feels like outside to people and animals. Wind chill is based on the rate of heat loss from exposed skin caused by combined effects of wind and cold.
Q.	What is frostbite?
A.	Frostbite is the result of the body tissue freezing and most frequently affects the extremities such as fingers, nose and toes. Symptoms include a pale white appearance and loss of feeling in these extremities.
Q.	What is an anemometer?
A.	An anemometer is a device for measuring wind speed.
Q.	What is hypothermia?
A.	Hypothermia occurs when the body temperature falls below 95F. Hypothermia is caused by exposure to cold and is aggravated by wet, wind and exhaustion. Warning signs include uncontrollable shivering, disorientation, memory loss, slurred speech, incoherence, drowsiness and exhaustion.

Source

NOAA-National Oceanic and Atmospheric Administration

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Please Note: The information contained in this publication is intended for general information purposes only. This publication is not a substitute for review of the applicable government regulations and standards, and should not be construed as legal advice or opinion. Readers with specific questions should refer to the cited regulation or consult with an attorney.