We also have two Canadian versions, using metric units, with degrees Celsius and kilometers per hour or alternatively watts per square meter. The Windchill Temperature ( WCT) chart below was created in 2001/2002 by Environment Canada ( EC) and the U.S. This US version of the Windchill Chart uses Imperial units of measure such as degrees Fahrenheit and miles per hour for wind speed. The windchill equivalent temperature is simply a way or relating how wind appears to make a given temperature cool things as though it were really much colder. Convection and evaporation together can rapidly strip heat away from your body. Respiration is breathing and breathing in cold air cools your core. The shaded areas show how long it will take for exposed skin become frostbitten. Evaporation translates to losing heat when water (such as perspiration) changes phase from liquid to gas. Use the wind chill chart below to check wind chill based on the wind and temperature. Radiation is the process by which your body radiates heat. (Humidity does not affect the overall wind chill enough to be considered a factor. Let’s break it down: Here, T represents air temperature in Fahrenheit and V represents wind speed in miles per hour. Convection is simply the wind blowing away the layer of warm air that is normally next to your skin. The National Weather Service’s formula to calculate wind chill is: 35.74 + 0.6215T 35.75 (V 0.16) + 0.4275T (V 0.16 ). These values give a more accurate representation of temperature than just using the air temperature figure quoted in weather forecasts, although some forecasters now also quote ‘feels like. Conduction is when you lose heat touching something colder than you are. This is a chart of wind chill factors and is designed to show the temperature we feel at a given air temperature and wind speed. Outdoor Article of the Month - March 1997ĭuring cold weather our bodies lose heat through five major mechanisms: Conduction, Convection, Radiation, Evaporation and Respiration. US Wind Chill Equivalent Temperature Chart
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