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How do I calculate Wind Chill?
The wind chill is a measurement of what it "feels like" when wind speed is considered. We all know that wind can make a cool winter day feel bitter cold, and the wind chill is just a way of measuring this effect. The current formula for wind chill, set by the National Weather Service, is the following:
Wind Chill (Celsius, km/h)
In this formula, Tchill is the wind chill in celsius. Ta is the actual temperature. V is the wind velocity in km/h.
Wind Chill (Fahrenheit, mph)
To calculate the wind chill in fahrenheit, use the formula below. This formula uses mph for the wind speed.
The National Weather Service has a page that includes a chart of wind chill values for given wind speeds. There's also a wind chill calculator there. Or, visit Wunderground for a map of current US wind chill values.