What is Wind Chill?


(WTNH) — We often hear the terms “wind chill” and “wind chill factor,” but what is wind chill?

Wind chill is defined as “The apparent temperature felt on the exposed human body owing to the combination of temperature and wind speed.”

The forecast for tonight features temperatures that will feel like -20°F at times! Brrr. You can click here for the forecast. 

But here’s a breakdown of what wind chill is and how to calculate it!

  • Calculates wind speed at an average height of 5 feet, the typical height of an adult human face, based on readings from the national standard height of 33 feet, typical height of an anemometer
  • Is based on a human face model
  • Incorporates heat transfer theory: heat loss from the body to its surroundings, during cold and breezy/windy days
  • Lowers the calm wind threshold to 3 mph
  • Uses a consistent standard for skin tissue resistance
  • Assumes no impact from the sun, i.e., clear night sky

The new formula for winds in mph and Fahrenheit temperatures is:

Wind chill temperature = 35.74 + 0.6215T – 35.75V (**0.16) + 0.4275TV(**0.16)

In the formula, V is in the wind speed in statute miles per hour, and T is the temperature in degrees Fahrenheit.

Note: In the formula, ** means the following term is an exponent (i.e. 10**(0.5 ) means 10 to the 0.5 power, or the square root of V), – means to subtract, + means to add. A letter next to a number means to multiply that quantity represented by the letter by the number. The standard rules of algebra apply.

Luckily anyone can now calculate the wind chill with a chart like these listed below. Stay warm out there!

Meteorologist Kevin Arnone

Interact with me on Facebook or Twitter! Send me a question on social media, and I’ll get back to you!

windchill What is Wind Chill?

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